/* !!! THIS FILE WILL BE MERGED INTO miniaudio.h WHEN COMPLETE !!! */

/*
EXPERIMENTAL
============
Everything in this file is experimental and subject to change. Some stuff isn't yet implemented, in particular spatialization. I've noted some ideas that are
basically straight off the top of my head - many of these are probably outright wrong or just generally bad ideas.

Very simple APIs for spatialization are declared by not yet implemented. They're just placeholders to give myself an idea on some of the API design.

The idea is that you have an `ma_engine` object - one per listener. Decoupled from that is the `ma_resource_manager` object. You can have one `ma_resource_manager`
object to many `ma_engine` objects. This will allow you to share resources between each listener. The `ma_engine` is responsible for the playback of audio from a
list of data sources. The `ma_resource_manager` is responsible for the actual loading, caching and unloading of those data sources. This decoupling is
something that I'm really liking right now and will likely stay in place for the final version.

You create "sounds" from the engine which represent a sound/voice in the world. You first need to create a sound, and then you need to start it. Sounds do not
start by default. You can use `ma_engine_play_sound()` to "fire and forget" sounds. Sounds can have an effect (`ma_effect`) applied to it which can be set with
`ma_sound_set_effect()`.

Sounds can be allocated to groups called `ma_sound_group`. The creation and deletion of groups is not thread safe and should usually happen at initialization
time. Groups are how you handle submixing. In many games you will see settings to control the master volume in addition to groups, usually called SFX, Music
and Voices. The `ma_sound_group` object is how you would achieve this via the `ma_engine` API. When a sound is created you need to specify the group it should
be associated with. The sound's group cannot be changed after it has been created.

The creation and deletion of sounds should, hopefully, be thread safe. I have not yet done thorough testing on this, so there's a good chance there may be some
subtle bugs there.

The best resource to use when understanding the API is the function declarations for `ma_engine`. I expect you should be able to figure it out! :)
*/

/*
Memory Allocation Types
=======================
When allocating memory you may want to optimize your custom allocators based on what it is miniaudio is actually allocating. Normally the context in which you
are using the allocator is enough to optimize allocations, however there are high-level APIs that perform many different types of allocations and it can be
useful to be told exactly what it being allocated so you can optimize your allocations appropriately.
*/
#define MA_ALLOCATION_TYPE_GENERAL                              0x00000001  /* A general memory allocation. */
#define MA_ALLOCATION_TYPE_CONTEXT                              0x00000002  /* A ma_context allocation. */
#define MA_ALLOCATION_TYPE_DEVICE                               0x00000003  /* A ma_device allocation. */
#define MA_ALLOCATION_TYPE_DECODER                              0x00000004  /* A ma_decoder allocation. */
#define MA_ALLOCATION_TYPE_AUDIO_BUFFER                         0x00000005  /* A ma_audio_buffer allocation. */
#define MA_ALLOCATION_TYPE_ENCODED_BUFFER                       0x00000006  /* Allocation for encoded audio data containing the raw file data of a sound file. */
#define MA_ALLOCATION_TYPE_DECODED_BUFFER                       0x00000007  /* Allocation for decoded audio data from a sound file. */
#define MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER_NODE    0x00000010  /* A ma_resource_manager_data_buffer_node object. */
#define MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER         0x00000011  /* A ma_resource_manager_data_buffer_node object. */
#define MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_STREAM         0x00000012  /* A ma_resource_manager_data_stream object. */
#define MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_SOURCE         0x00000013  /* A ma_resource_manager_data_source object. */

/*
Resource Management
===================
Many programs will want to manage sound resources for things such as reference counting and streaming. This is supported by miniaudio via the
`ma_resource_manager` API.

The resource manager is mainly responsible for the following:

    1) Loading of sound files into memory with reference counting.
    2) Streaming of sound data

When loading a sound file, the resource manager will give you back a data source compatible object called `ma_resource_manager_data_source`. This object can be
passed into any `ma_data_source` API which is how you can read and seek audio data. When loading a sound file, you specify whether or not you want the sound to
be fully loaded into memory (and optionally pre-decoded) or streamed. When loading into memory, you can also specify whether or not you want the data to be
loaded asynchronously.

The example below is how you can initialize a resource manager using it's default configuration:

    ```c
    ma_resource_manager_config config;
    ma_resource_manager resourceManager;

    config = ma_resource_manager_config_init();
    result = ma_resource_manager_init(&config, &resourceManager);
    if (result != MA_SUCCESS) {
        ma_device_uninit(&device);
        printf("Failed to initialize the resource manager.");
        return -1;
    }
    ```

You can configure the format, channels and sample rate of the decoded audio data. By default it will use the file's native data format, but you can configure
it to use a consistent format. This is useful for offloading the cost of data conversion to load time rather than dynamically converting a mixing time. To do
this, you configure the decoded format, channels and sample rate like the code below:

    ```c
    config = ma_resource_manager_config_init();
    config.decodedFormat     = device.playback.format;
    config.decodedChannels   = device.playback.channels;
    config.decodedSampleRate = device.sampleRate;
    ```

In the code above, the resource manager will be configured so that any decoded audio data will be pre-converted at load time to the device's native data
format. If instead you used defaults and the data format of the file did not match the device's data format, you would need to convert the data at mixing time
which may be prohibitive in high-performance and large scale scenarios like games.

Asynchronicity is achieved via a job system. When an operation needs to be performed, such as the decoding of a page, a job will be posted to a queue which
will then be processed by a job thread. By default there will be only one job thread running, but this can be configured, like so:

    ```c
    config = ma_resource_manager_config_init();
    config.jobThreadCount = MY_JOB_THREAD_COUNT;
    ```

By default job threads are managed internally by the resource manager, however you can also self-manage your job threads if, for example, you want to integrate
the job processing into your existing job infrastructure, or if you simply don't like the way the resource manager does it. To do this, just set the job thread
count to 0 and process jobs manually. To process jobs, you first need to retrieve a job using `ma_resource_manager_next_job()` and then process it using
`ma_resource_manager_process_job()`:

    ```c
    config = ma_resource_manager_config_init();
    config.jobThreadCount = 0;                            // Don't manage any job threads internally.
    config.flags = MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING; // Optional. Makes `ma_resource_manager_next_job()` non-blocking.

    // ... Initialize your custom job threads ...

    void my_custom_job_thread(...)
    {
        for (;;) {
            ma_job job;
            ma_result result = ma_resource_manager_next_job(pMyResourceManager, &job);
            if (result != MA_SUCCESS) {
                if (result == MA_NOT_DATA_AVAILABLE) {
                    // No jobs are available. Keep going. Will only get this if the resource manager was initialized
                    // with MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING.
                    continue;
                } else if (result == MA_CANCELLED) {
                    // MA_JOB_QUIT was posted. Exit.
                    break;
                } else {
                    // Some other error occurred.
                    break;
                }
            }

            ma_resource_manager_process_job(pMyResourceManager, &job);
        }
    }
    ```

In the example above, the MA_JOB_QUIT event is the used as the termination indicator. You can instead use whatever variable you would like to terminate the
thread. The call to `ma_resource_manager_next_job()` is blocking by default, by can be configured to be non-blocking by initializing the resource manager
with the MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING configuration flag.

When loading a file, it's sometimes convenient to be able to customize how files are opened and read. This can be done by setting `pVFS` member of the
resource manager's config:

    ```c
    // Initialize your custom VFS object. See documentation for VFS for information on how to do this.
    my_custom_vfs vfs = my_custom_vfs_init();

    config = ma_resource_manager_config_init();
    config.pVFS = &vfs;
    ```

If you do not specify a custom VFS, the resource manager will use the operating system's normal file operations. This is default.

To load a sound file and create a data source, call `ma_resource_manager_data_source_init()`. When loading a sound you need to specify the file path and
options for how the sounds should be loaded. By default a sound will be loaded synchronously. The returned data source is owned by the caller which means the
caller is responsible for the allocation and freeing of the data source. Below is an example for initializing a data source:

    ```c
    ma_resource_manager_data_source dataSource;
    ma_result result = ma_resource_manager_data_source_init(pResourceManager, pFilePath, flags, &dataSource);
    if (result != MA_SUCCESS) {
        // Error.
    }

    // ...

    // A ma_resource_manager_data_source object is compatible with the `ma_data_source` API. To read data, just call
    // the `ma_data_source_read_pcm_frames()` like you would with any normal data source.
    result = ma_data_source_read_pcm_frames(&dataSource, pDecodedData, frameCount, &framesRead);
    if (result != MA_SUCCESS) {
        // Failed to read PCM frames.
    }

    // ...

    ma_resource_manager_data_source_uninit(pResourceManager, &dataSource);
    ```

The `flags` parameter specifies how you want to perform loading of the sound file. It can be a combination of the following flags:

    ```
    MA_DATA_SOURCE_STREAM
    MA_DATA_SOURCE_DECODE
    MA_DATA_SOURCE_ASYNC
    ```

When no flags are specified (set to 0), the sound will be fully loaded into memory, but not decoded, meaning the raw file data will be stored in memory, and
then dynamically decoded when `ma_data_source_read_pcm_frames()` is called. To instead decode the audio data before storing it in memory, use the
`MA_DATA_SOURCE_DECODE` flag. By default, the sound file will be loaded synchronously, meaning `ma_resource_manager_data_source_init()` will only return after
the entire file has been loaded. This is good for simplicity, but can be prohibitively slow. You can instead load the sound asynchronously using the
`MA_DATA_SOURCE_ASYNC` flag. This will result in `ma_resource_manager_data_source_init()` returning quickly, but no data will be returned by
`ma_data_source_read_pcm_frames()` until some data is available. When no data is available because the asynchronous decoding hasn't caught up, MA_BUSY will be
returned by `ma_data_source_read_pcm_frames()`.

For large sounds, it's often prohibitive to store the entire file in memory. To mitigate this, you can instead stream audio data which you can do by specifying
the `MA_DATA_SOURCE_STREAM` flag. When streaming, data will be decoded in 1 second pages. When a new page needs to be decoded, a job will be posted to the job
queue and then subsequently processed in a job thread.

When loading asynchronously, it can be useful to poll whether or not loading has finished. Use `ma_resource_manager_data_source_result()` to determine this.
For in-memory sounds, this will return `MA_SUCCESS` when the file has been *entirely* decoded. If the sound is still being decoded, `MA_BUSY` will be returned.
Otherwise, some other error code will be returned if the sound failed to load. For streaming data sources, `MA_SUCCESS` will be returned when the first page
has been decoded and the sound is ready to be played. If the first page is still being decoded, `MA_BUSY` will be returned. Otherwise, some other error code
will be returned if the sound failed to load.

For in-memory sounds, reference counting is used to ensure the data is loaded only once. This means multiple calls to `ma_resource_manager_data_source_init()`
with the same file path will result in the file data only being loaded once. Each call to `ma_resource_manager_data_source_init()` must be matched up with a
call to `ma_resource_manager_data_source_uninit()`. Sometimes it can be useful for a program to register self-managed raw audio data and associate it with a
file path. Use `ma_resource_manager_register_decoded_data()`, `ma_resource_manager_register_encoded_data()` and `ma_resource_manager_unregister_data()` to do
this. `ma_resource_manager_register_decoded_data()` is used to associate a pointer to raw, self-managed decoded audio data in the specified data format with
the specified name. Likewise, `ma_resource_manager_register_encoded_data()` is used to associate a pointer to raw self-managed encoded audio data (the raw
file data) with the specified name. Note that these names need not be actual file paths. When `ma_resource_manager_data_source_init()` is called (without the
`MA_DATA_SOURCE_STREAM` flag), the resource manager will look for these explicitly registered data buffers and, if found, will use it as the backing data for
the data source. Note that the resource manager does *not* make a copy of this data so it is up to the caller to ensure the pointer stays valid for it's
lifetime. Use `ma_resource_manager_unregister_data()` to unregister the self-managed data. It does not make sense to use the `MA_DATA_SOURCE_STREAM` flag with
a self-managed data pointer. When `MA_DATA_SOURCE_STREAM` is specified, it will try loading the file data through the VFS.


Resource Manager Implementation Details
---------------------------------------
Resources are managed in two main ways:

    1) By storing the entire sound inside an in-memory buffer (referred to as a data buffer - `ma_resource_manager_data_buffer_node`)
    2) By streaming audio data on the fly (referred to as a data stream - `ma_resource_manager_data_stream`)

A resource managed data source (`ma_resource_manager_data_source`) encapsulates a data buffer or data stream, depending on whether or not the data source was
initialized with the `MA_DATA_SOURCE_FLAG_STREAM` flag. If so, it will make use of a `ma_resource_manager_data_stream` object. Otherwise it will use a
`ma_resource_manager_data_buffer_node` object.

Another major feature of the resource manager is the ability to asynchronously decode audio files. This relieves the audio thread of time-consuming decoding
which can negatively affect scalability due to the audio thread needing to complete it's work extremely quickly to avoid glitching. Asynchronous decoding is
achieved through a job system. There is a central multi-producer, multi-consumer, lock-free, fixed-capacity job queue. When some asynchronous work needs to be
done, a job is posted to the queue which is then read by a job thread. The number of job threads can be configured for improved scalability, and job threads
can all run in parallel without needing to worry about the order of execution (how this is achieved is explained below).

When a sound is being loaded asynchronously, playback can begin before the sound has been fully decoded. This enables the application to start playback of the
sound quickly, while at the same time allowing to resource manager to keep loading in the background. Since there may be less threads than the number of sounds
being loaded at a given time, a simple scheduling system is used to keep decoding time fair. The resource manager solves this by splitting decoding into chunks
called pages. By default, each page is 1 second long. When a page has been decoded, the a new job will be posted to start decoding the next page. By dividing
up decoding into pages, an individual sound shouldn't ever delay every other sound from having their first page decoded. Of course, when loading many sounds at
the same time, there will always be an amount of time required to process jobs in the queue so in heavy load situations there will still be some delay. To
determine if a data source is ready to have some frames read, use `ma_resource_manager_data_source_get_available_frames()`. This will return the number of
frames available starting from the current position.


Data Buffers
------------
When the `MA_DATA_SOURCE_FLAG_STREAM` flag is not specified at initialization time, the resource manager will try to load the data into an in-memory data
buffer. Before doing so, however, it will first check if the specified file has already been loaded. If so, it will increment a reference counter and just use
the already loaded data. This saves both time and memory. A binary search tree (BST) is used for storing data buffers as it has good balance between efficiency
and simplicity. The key of the BST is a 64-bit hash of the file path that was passed into `ma_resource_manager_data_source_init()`. The advantage of using a
hash is that it saves memory over storing the entire path, has faster comparisons, and results in a mostly balanced BST due to the random nature of the hash.
The disadvantage is that file names are case-sensitive. If this is an issue, you should normalize your file names to upper- or lower-case before initializing
your data sources.

When a sound file has not already been loaded and the `MA_DATA_SOURCE_ASYNC` is not specified, the file will be decoded synchronously by the calling thread.
There are two options for controlling how the audio is stored in the data buffer - encoded or decoded. When the `MA_DATA_SOURCE_DECODE` option is not
specified, the raw file data will be stored in memory. Otherwise the sound will be decoded before storing it in memory. Synchronous loading is a very simple
and standard process of simply adding an item to the BST, allocating a block of memory and then decoding (if `MA_DATA_SOURCE_DECODE` is specified).

When the `MA_DATA_SOURCE_ASYNC` flag is specified, loading of the data buffer is done asynchronously. In this case, a job is posted to the queue to start
loading and then the function instantly returns, setting an internal result code to `MA_BUSY`. This result code is returned when the program calls
`ma_resource_manager_data_source_result()`. When decoding has fully completed, `MA_RESULT` will be returned. This can be used to know if loading has fully
completed.

When loading asynchronously, a single job is posted to the queue of the type `MA_JOB_LOAD_DATA_BUFFER`. This involves making a copy of the file path and
associating it with job. When the job is processed by the job thread, it will first load the file using the VFS associated with the resource manager. When
using a custom VFS, it's important that it be completely thread-safe because it will be used from one or more job threads at the same time. Individual files
should only ever be accessed by one thread at a time, however. After opening the file via the VFS, the job will determine whether or not the file is being
decoded. If not, it simply allocates a block of memory and loads the raw file contents into it and returns. On the other hand, when the file is being decoded,
it will first allocate a decoder on the heap and initialize it. Then it will check if the length of the file is known. If so it will allocate a block of memory
to store the decoded output and initialize it to silence. If the size is unknown, it will allocate room for one page. After memory has been allocated, the
first page will be decoded. If the sound is shorter than a page, the result code will be set to `MA_SUCCESS` and the completion event will be signalled and
loading is now complete. If, however, there is store more to decode, a job with the code `MA_JOB_PAGE_DATA_BUFFER` is posted. This job will decode the next
page and perform the same process if it reaches the end. If there is more to decode, the job will post another `MA_JOB_PAGE_DATA_BUFFER` job which will keep on
happening until the sound has been fully decoded. For sounds of an unknown length, the buffer will be dynamically expanded as necessary, and then shrunk with a
final realloc() when the end of the file has been reached.


Data Streams
------------
Data streams only ever store two pages worth of data for each sound. They are most useful for large sounds like music tracks in games which would consume too
much memory if fully decoded in memory. Only two pages of audio data are stored in memory at a time for each data stream. After every frame from a page has
been read, a job will be posted to load the next page which is done from the VFS.

For data streams, the `MA_DATA_SOURCE_FLAG_ASYNC` flag will determine whether or not initialization of the data source waits until the two pages have been
decoded. When unset, `ma_resource_manager_data_source_init()` will wait until the two pages have been loaded, otherwise it will return immediately.

When frames are read from a data stream using `ma_resource_manager_data_source_read_pcm_frames()`, `MA_BUSY` will be returned if there are no frames available.
If there are some frames available, but less than the number requested, `MA_SUCCESS` will be returned, but the actual number of frames read will be less than
the number requested. Due to the asymchronous nature of data streams, seeking is also asynchronous. If the data stream is in the middle of a seek, `MA_BUSY`
will be returned when trying to read frames.

When `ma_resource_manager_data_source_read_pcm_frames()` results in a page getting fully consumed, a job is posted to load the next page. This will be posted
from the same thread that called `ma_resource_manager_data_source_read_pcm_frames()` which should be lock-free.

Data streams are uninitialized by posting a job to the queue, but the function won't return until that job has been processed. The reason for this is that the
caller owns the data stream object and therefore we need to ensure everything completes before handing back control to the caller. Also, if the data stream is
uninitialized while pages are in the middle of decoding, they must complete before destroying any underlying object and the job system handles this cleanly.


Job Queue
---------
The resource manager uses a job queue which is multi-producer, multi-consumer, lock-free and fixed-capacity. The lock-free property of the queue is achieved
using the algorithm described by Michael and Scott: Nonblocking Algorithms and Preemption-Safe Locking on Multiprogrammed Shared Memory Multiprocessors. In
order for this to work, only a fixed number of jobs can be allocated and inserted into the queue which is done through a lock-free data structure for
allocating an index into a fixed sized array, with reference counting for mitigation of the ABA problem. The reference count is 32-bit.

For many types of jobs it's important that they execute in a specific order. In these cases, jobs are executed serially. The way in which each type of job
handles this is specific to the job type. For the resource manager, serial execution of jobs is only required on a per-object basis (per data buffer or per
data stream). Each of these objects stores an execution counter. When a job is posted it is associated with an execution counter. When the job is processed, it
checks if the execution counter of the job equals the execution counter of the owning object and if so, processes the job. If the counters are not equal, the
job will be posted back onto the job queue for later processing. When the job finishes processing the execution order of the main object is incremented. This
system means the no matter how many job threads are executing, decoding of an individual sound will always get processed serially. The advantage to having
multiple threads comes into play when loading multiple sounds at the time time.
*/
#ifndef miniaudio_engine_h
#define miniaudio_engine_h

#ifdef __cplusplus
extern "C" {
#endif

MA_API size_t ma_get_accumulation_bytes_per_sample(ma_format format);
MA_API size_t ma_get_accumulation_bytes_per_frame(ma_format format, ma_uint32 channels);


/*
Routing Infrastructure
======================
miniaudio's routing infrastructure follows a node graph paradigm. The idea is that you create a
node whose outputs are attached to inputs of another node, thereby creating a graph. There are
different types of nodes, with each node in the graph processing input data to produce output,
which is then fed through the chain. Each node in the graph can apply their own custom effects. At
the end of the graph is an endpoint which represents the end of the chain and is where the final
output is ultimately extracted from.

Each node has a number of input buses and a number of output buses. Currently the maximum number
of input buses and output buses is 2 each (2 input buses, 2 output buses). This may change later
as new requirements come up. An output bus from a node is attached to an input bus of another.
Multiple nodes can connect their output buses to another node's input bus, in which case their
outputs will be mixed before processing by the node.

Each input bus must be configured to accept the same number of channels, but input buses and output
buses can each have different channel counts, in which case miniaudio will automatically convert
the input data to the output channel count before processing. The number of channels of an output
bus of one node must match the channel count of the input bus it's attached to. The channel counts
cannot be changed after the node has been initialized. If you attempt to attach an output bus to
an input bus with a different channel count, attachment will fail.

To use a node graph, you first need to initialize a `ma_node_graph` object. This is essentially a
container around the entire graph. The `ma_node_graph` object is required for some thread-safety
issues which will be explained later. A `ma_node_graph` object is initialized using miniaudio's
standard config/init system:

    ```c
    ma_node_graph_config nodeGraphConfig = ma_node_graph_config_init(myChannelCount);
    result = ma_node_graph_init(&nodeGraphConfig, NULL, &nodeGraph);    // Second parameter is a pointer to allocation callbacks.
    if (result != MA_SUCCESS) {
        // Failed to initialize node graph.
    }
    ```

When you initialize the node graph, you're specifying the channel count of the endpoint. The
endpoint is a special node which has one input bus and one output bus, both of which have the
same channel count, which is specified in the config. Any nodes that ultimately connect to the
endpoint must be configured such that their output buses have the same channel count. When you read
audio data from the node graph, it'll have the channel count you specified in the config. To read
data from the graph:

    ```c
    ma_uint32 framesRead;
    result = ma_node_graph_read_pcm_frames(&nodeGraph, pFramesOut, frameCount, &framesRead);
    if (result != MA_SUCCESS) {
        // Failed to read data from the node graph.
    }
    ```

When you read audio data, miniaudio starts at the node graph's special internal endpoint node which
then pulls in data from it's input attachments, which in turn recusively pull in data from their
inputs, and so on. At the very base of the graph there will be some kind of data source node which
will have zero inputs and will instead read directly from a data source. The base nodes don't
literally need to read from a `ma_data_source` object, but they will always have some kind of
underlying object that sources some kind of audio. The `ma_data_source_node` node can be used to
read from a `ma_data_source`. Data is always in floating-point format and in the number of channels
you specified when the graph was initialized. The sample rate is defined by the underlying data
sources - it's up to you to ensure they use a consistent and appropraite sample rate.

The `ma_node` API is designed to allow custom nodes to be implemented with relative ease. Most
often you'll just use one of the stock node types. This is how you would initialize a node which
reads directly from a data source (`ma_data_source_node`):

    ```c
    ma_data_source_node_config config = ma_data_source_node_config_init(pMyDataSource, isLooping);

    ma_data_source_node dataSourceNode;
    result = ma_data_source_node_init(&nodeGraph, &config, NULL, &dataSourceNode);
    if (result != MA_SUCCESS) {
        // Failed to create data source node.
    }
    ```

The data source node will use the output channel count to determine the channel count of the output
bus. There will be 1 output bus and 0 input buses (data will be drawn directly from the data
source). The data source must output to floating-point (ma_format_f32) or else an error will be
returned from `ma_data_source_node_init()`.

By default the node will not be attached to the graph. To do so, use `ma_node_attach_output_bus()`:

    ```c
    result = ma_node_attach_output_bus(&dataSourceNode, 0, ma_node_graph_get_endpoint(&nodeGraph), 0);
    if (result != MA_SUCCESS) {
        // Failed to attach node.
    }
    ```

The code above connects the data source node directly to the endpoint. Since the data source node
has only a single output bus, the index will always be 0. Likewise, the endpoint only has a single
input bus which means the input bus index will also always be 0.

To detach a specific output bus, use `ma_node_detach_output_bus()`. To detach all output buses, use
`ma_node_detach_all_output_buses()`. If you want to just move the output bus from one attachment to
another, you do not need to detach first. You can just call `ma_node_attach_output_bus()` and it'll
deal with it for you.

Less frequently you may want to create a specialized node. This will be a node where you implement
your own processing callback to apply a custom effect of some kind. This is similar to initalizing
one of the stock node types, only this time you need to specify a pointer to a vtable containing a
pointer to the processing function and the number of input and output buses. Example:

    ```c
    static void my_custom_node_process_pcm_frames(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
    {
        // Do some processing of ppFramesIn (one stream of audio data per input bus)
        const float* pFramesIn_0 = ppFramesIn[0]; // Input bus @ index 0.
        const float* pFramesIn_1 = ppFramesIn[1]; // Input bus @ index 1.
        float* pFramesOut_0 = ppFramesOut[0];     // Output bus @ index 0.

        // Do some processing. Process as many frames as you can. On input, `pFrameCountIn` will be
        // the number of input frames in each buffer in `ppFramesIn` and `pFrameCountOut` will be
        // the capacity of each of the buffers in `ppFramesOut`. On output, `pFrameCountIn` should
        // be set to the number of input frames your node consumed and `pFrameCountOut` should be
        // set the number of output frames that were produced.
        //
        // You should process as many frames as you can. If your effect consumes input frames at the
        // same rate as output frames (always the case, unless you're doing resampling), you need
        // only look at `ppFramesOut` and process that exact number of frames. If you're doing
        // resampling, you'll need to be sure to set both `pFrameCountIn` and `pFrameCountOut`
        // properly.
    }

    static ma_node_vtable my_custom_node_vtable = 
    {
        my_custom_node_process_pcm_frames, // The function that will be called process your custom node. This is where you'd implement your effect processing.
        2,      // 2 input buses.
        1,      // 1 output bus.
        0       // Default flags.
    };

    ...
    
    ma_node_config nodeConfig = ma_node_config_init(&my_custom_node_vtable, channelsIn, channelsOut);

    ma_node_base node;
    result = ma_node_init(&nodeGraph, &nodeConfig, NULL, &node);
    if (result != MA_SUCCESS) {
        // Failed to initialize node.
    }
    ```

When initializing a custom node, as in the code above, you'll normally just place your vtable in
static space. The number of input and output buses are specified as part of the vtable. If you want
to do some unusual stuff where the number of buses is dynamically configurable on a per-instance
basis, you'll need to use a dynamic `ma_node_vtable` object. None of the stock node types do this.

Most often you'll want to create a structure to encapsulate your node with some extra data. You
need to make sure the `ma_node_base` object is your first member of the structure:

    ```c
    typedef struct
    {
        ma_node_base base; // <-- Make sure this is always the first member.
        float someCustomData;
    } my_custom_node;
    ```

By doing this, your object will be compatible with all `ma_node` APIs and you can attach it to the
graph just like any other node.

In the custom processing callback (`my_custom_node_process_pcm_frames()` in the example above), the
number of channels for each bus is what as specified by the config when the not was initialized
with `ma_node_init()` In addition, all attachments to each of the input buses will have been
pre-mixed by miniaudio. The config allows you to specify different channel counts for each
individual input and output bus. It's up to the effect to handle it appropriate, and if it can't,
return an error in it's initialization routine.

If you need to make a copy of an audio stream for effect processing you can use a splitter node
called `ma_splitter_node`. This takes has 1 input bus and splits the stream into 2 output buses.
You can use it like this:

    ```c
    ma_splitter_node_config splitterNodeConfig = ma_splitter_node_config_init(channelsIn, channelsOut);

    ma_splitter_node splitterNode;
    result = ma_splitter_node_init(&nodeGraph, &splitterNodeConfig, NULL, &splitterNode);
    if (result != MA_SUCCESS) {
        // Failed to create node.
    }

    // Attach your output buses to two different input buses (can be on two different nodes).
    ma_node_attach_output_bus(&splitterNode, 0, ma_node_graph_get_endpoint(&nodeGraph), 0); // Attach directly to the endpoint.
    ma_node_attach_output_bus(&splitterNode, 1, &myEffectNode,                          0); // Attach to input bus 0 of some effect node.
    ```

The volume of an output bus can be configured on a per-bus basis:

    ```c
    ma_node_set_output_bus_volume(&splitterNode, 0, 0.5f);
    ma_node_set_output_bus_volume(&splitterNode, 1, 0.5f);
    ```

In the code above we're using the splitter node from before and changing the volume of each of the
copied streams.

You can start, stop and mute a node with the following:

    ```c
    ma_node_set_state(&splitterNode, ma_node_state_started);    // The default state.
    ma_node_set_state(&splitterNode, ma_node_state_stopped);
    ma_node_set_state(&splitterNode, ma_node_state_muted);
    ```

By default the node is in a started state, but since it won't be connected to anything won't
actually be invoked by the node graph until it's actually connected. When you stop a node, data
will not be read from any of it's input connections. You can use this property to stop a group of
sounds atomically.

You can configure the initial state of a node in it's config:

    ```c
    nodeConfig.initialState = ma_node_state_stopped;
    ```

Note that for the stock specialized nodes, all of their configs will have a `nodeConfig` member
which is the config to use with the base node. This is where the initial state can be configured
for specialized nodes:

    ```c
    dataSourceNodeConfig.nodeConfig.initialState = ma_node_state_stopped;
    ```

When using a specialized node like `ma_data_source_node` or `ma_splitter_node`, be sure to not
modify the `vtable` member of the `nodeConfig` object.


Timing
------
The node graph supports starting and stopping nodes at scheduled times. This is especially useful
for data source nodes where you want to get the node set up, but only start playback at a specific
time. There are two clocks: local and global.

A local clock is per-node, whereas the global clock is per graph. Scheduling starts and stops can
only be done based on the global clock because the local clock will not be running while the node
is stopped. The global clocks advances whenever `ma_node_graph_read_pcm_frames()` is called. On the
other hand, the local clock only advances when the node's processing callback is fired, and is
advanced based on the output frame count.

To retrieve the global time, use `ma_node_graph_get_time()`. The global time can be set with
`ma_node_graph_set_time()` which might be useful if you want to do seeking on a global timeline.
Getting and setting the local time is similar. Use `ma_node_get_time()` to retrieve the local time,
and `ma_node_set_time()` to set the local time. The global and local times will be advanced by the
audio thread, so care should be taken to avoid data races. Ideally you should avoid calling these
outside of the node processing callbacks which are always run on the audio thread.

There is basic support for scheduling the starting and stopping of nodes. You can only schedule one
start and one stop at a time. This is mainly intended for putting nodes into a started or stopped
state in a frame-exact manner. Without this mechanism, starting and stopping of a node is limited
to the resolution of a call to `ma_node_graph_read_pcm_frames()` which would typically be in blocks
of several milliseconds. The following APIs can be used for scheduling node states:

    ```c
    ma_node_set_state_time()
    ma_node_get_state_time()
    ```

The time is absolute and must be based on the global clock. An example is below:

    ```c
    ma_node_set_state_time(&myNode, ma_node_state_started, sampleRate*1);   // Delay starting to 1 second.
    ma_node_set_state_time(&myNode, ma_node_state_stopped, sampleRate*5);   // Delay stopping to 5 seconds.
    ```

An example for changing the state using a relative time.

    ```c
    ma_node_set_state_time(&myNode, ma_node_state_started, sampleRate*1 + ma_node_graph_get_time(&myNodeGraph));
    ma_node_set_state_time(&myNode, ma_node_state_stopped, sampleRate*5 + ma_node_graph_get_time(&myNodeGraph));
    ```

Note that due to the nature of multi-threading the times may not be 100% exact. If this is an
issue, consider scheduling state changes from within a processing callback. An idea might be to
have some kind of passthrough trigger node that is used specifically for tracking time and handling
events.



Thread Safety and Locking
-------------------------
When processing audio, it's ideal not to have any kind of locking in the audio thread. Since it's
expected that `ma_node_graph_read_pcm_frames()` would be run on the audio thread, it does so
without the use of any locks. This section discusses the implementation used by miniaudio and goes
over some of the compromises employed by miniaudio to achieve this goal. Note that the current
implementation may not be ideal - feedback and critiques are most welcome.

The node graph API is not *entirely* lock-free. Only `ma_node_graph_read_pcm_frames()` is expected
to be lock-free. Attachment, detachment and uninitialization of nodes use locks to simplify the
implementation, but are crafted in a way such that such locking is not required when reading audio
data from the graph. Locking in these areas are achieved by means of spinlocks.

The main complication with keeping `ma_node_graph_read_pcm_frames()` lock-free stems from the fact
that a node can be uninitialized, and it's memory potentially freed, while in the middle of being
processed on the audio thread. There are times when the audio thread will be referencing a node,
which means the uninitialization process of a node needs to make sure it delays returning until the
audio thread is finished so that control is not handed back to the caller thereby giving them a
chance to free the node's memory.

When the audio thread is processing a node, it does so by reading from each of the output buses of
the node. In order for a node to process data for one of it's output buses, it needs to read from
each of it's input buses, and so on an so forth. It follows that once all output buses of a node
are detached, the node as a whole will be disconnected and no further processing will occur unless
it's output buses are reattached, which won't be happening when the node is being uninitialized.
By having `ma_node_detach_output_bus()` wait until the audio thread is finished with it, we can
simplify a few things, at the expense of making `ma_node_detach_output_bus()` a bit slower. By
doing this, the implementation of `ma_node_uninit()` becomes trivial - just detach all output
nodes, followed by each of the attachments to each of it's input nodes, and then do any final clean
up.

With the above design, the worst-case scenario is `ma_node_detach_output_bus()` taking as long as
it takes to process the output bus being detached. This will happen if it's called at just the
wrong moment where the audio thread has just iterated it and has just started processing. The
caller of `ma_node_detach_output_bus()` will stall until the audio thread is finished, which
includes the cost of recursively processing it's inputs. This is the biggest compromise made with
the approach taken by miniaudio for it's lock-free processing system. The cost of detaching nodes
earlier in the pipeline (data sources, for example) will be cheaper than the cost of detaching
higher level nodes, such as some kind of final post-processing endpoint. If you need to do mass
detachments, detach starting from the lowest level nodes and work your way towards the final
endpoint node (but don't try detaching the node graph's endpoint). If the audio thread is not
running, detachment will be fast and detachment in any order will be the same. The reason nodes
need to wait for their input attachments to complete is due to the potential for desyncs between
data sources. If the node was to terminate processing mid way through processing it's inputs,
there's a chance that some of the underlying data sources will have been read, but then others not.
That will then result in a potential desynchronization when detaching and reattaching higher-level
nodes. A possible solution to this is to have an option when detaching to terminate processing
before processing all input attachments which should be fairly simple.

Another compromise, albeit less significant, is locking when attaching and detaching nodes. This
locking is achieved by means of a spinlock in order to reduce memory overhead. A lock is present
for each input bus and output bus, totaling 4 for each node. When an output bus is connected to an
input bus, both the output bus and input bus is locked. This locking is specifically for attaching
and detaching across different threads and does not affect `ma_node_graph_read_pcm_frames()` in any
way. The locking and unlocking is mostly self-explanatory, but slightly less intuitive part comes
into it when considering that iterating over attachments must not break as a result of attaching or
detaching a node while iteration is occuring.

Attaching and detaching are both quite simple. When an output bus of a node is attached to an input
bus of another node, it's added to a linked list. Basically, an input bus is a linked list, where
each item in the list is and output bus. We have some intentional (and convenient) restrictions on
what can done with the linked list in order to simplify the implementation. First of all, whenever
something needs to iterate over the list, it must do so in a forward direction. Backwards iteration
is not supported. Also, items can only be added to the start of the list.

The linked list is a doubly-linked list where each item in the list (an output bus) holds a pointer
to the next item in the list, and another to the previous item. A pointer to the previous item is
only required for fast detachment of the node - it is never used in iteration. This is an
important property because it means from the perspective of iteration, attaching and detaching of
an item can be done with a single atomic assignment. This is exploited by both the attachment and
detachment process. When attaching the node, the first thing that is done is the setting of the
local "next" and "previous" pointers of the node. After that, the item is "attached" to the list
by simply performing an atomic exchange with the head pointer. After that, the node is "attached"
to the list from the perspective of iteration. Even though the "previous" pointer of the next item
hasn't yet been set, from the perspective of iteration it's been attached because iteration will
only be happening in a forward direction which means the "previous" pointer won't actually ever get
used. The same general process applies to detachment. See `ma_node_attach_output_bus()` and
`ma_node_detach_output_bus()` for the implementation of this mechanism.

Loop detection is achieved through the use of a counter. At the ma_node_graph level there is a
counter which is updated after each read. There is also a counter for each node which is set to the
counter of the node graph plus 1 after each time it processes data. Before anything is processed, a
check is performed that the node's counter is lower or equal to the node graph. If so, it's fine to
proceed with processing. If not, MA_LOOP is returned and nothing is output. This represents a sort
of termination point.
*/


/* Must never exceed 255. */
#ifndef MA_MAX_NODE_BUS_COUNT
#define MA_MAX_NODE_BUS_COUNT   2
#endif

typedef struct ma_node_graph ma_node_graph;
typedef void ma_node;


/* The playback state of a node. Either started or stopped. */
typedef enum
{
    ma_node_state_started = 0,
    ma_node_state_stopped = 1
} ma_node_state;


typedef struct
{
    /*
    Extended processing callback. This callback is used for effects that process input and output
    at different rates (i.e. they perform resampling). This is similar to the simple version, only
    they take two sepate frame counts: one for input, and one for output.

    On input, `pFrameCountOut` is equal to the capacity of the output buffer for each bus, whereas
    `pFrameCountIn` will be equal to the number of PCM frames in each of the buffers in `ppFramesIn`.

    On output, set `pFrameCountOut` to the number of PCM frames that were actually output and set
    `pFrameCountIn` to the number of input frames that were consumed.
    */
    void (* onProcess)(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut);

    /*
    The number of input buses. This is how many sub-buffers will be contained in the `ppFramesIn`
    parameters of the callbacks above.
    */
    ma_uint8 inputBusCount;

    /*
    The number of output buses. This is how many sub-buffers will be contained in the `ppFramesOut`
    parameters of the callbacks above.
    */
    ma_uint8 outputBusCount;

    /*
    Flags describing characteristics of the node. This is currently just a placeholder for some
    ideas for later on.
    */
    ma_uint32 flags;
} ma_node_vtable;

typedef struct
{
    const ma_node_vtable* vtable;   /* Should never be null. Initialization of the node will fail if so. */
    ma_uint32 inputChannels[MA_MAX_NODE_BUS_COUNT];
    ma_uint32 outputChannels[MA_MAX_NODE_BUS_COUNT];
    ma_node_state initialState;     /* Defaults to ma_node_state_started. */
} ma_node_config;

MA_API ma_node_config ma_node_config_init(ma_node_vtable* vtable, ma_uint32 inputChannels, ma_uint32 outputChannels);


/*
A node has multiple output buses. An output bus is attached to an input bus as an item in a linked
list. Think of the input bus as a linked list, with the output bus being an item in that list.
*/
#define MA_NODE_OUTPUT_BUS_FLAG_HAS_READ    0x01    /* Whether or not this bus ready to read more data. Only used on nodes with multiple output buses. */

typedef struct ma_node_output_bus ma_node_output_bus;
struct ma_node_output_bus
{
    /* Immutable. */
    ma_node* pNode;                             /* The node that owns this output bus. The input node. Will be null for dummy head and tail nodes. */
    ma_uint32 readCounter;                      /* For loop prevention. Compared with the current read count of the node graph. If larger, means a loop was encountered and reading is aborted and no samples read. */
    ma_uint8 outputBusIndex;                    /* The index of the output bus on pNode that this output bus represents. */
    ma_uint8 channels;                          /* The number of channels in the audio stream for this bus. */

    /* Mutable via multiple threads. Must be used atomically. The weird ordering here is for packing reasons. */
    MA_ATOMIC ma_uint8 inputNodeInputBusIndex;  /* The index of the input bus on the input. Required for detaching. */
    MA_ATOMIC ma_uint8 flags;                   /* Some state flags for tracking the read state of the output buffer. */
    MA_ATOMIC ma_uint16 refCount;               /* Reference count for some thread-safety when detaching. */
    MA_ATOMIC ma_bool8 isAttached;              /* This is used to prevent iteration of nodes that are in the middle of being detached. Used for thread safety. */
    MA_ATOMIC ma_spinlock lock;                 /* Unfortunate lock, but significantly simplifies the implementation. Required for thread-safe attaching and detaching. */
    MA_ATOMIC float volume;                     /* Linear 0..1 */
    MA_ATOMIC ma_node_output_bus* pNext;        /* If null, it's the tail node or detached. */
    MA_ATOMIC ma_node_output_bus* pPrev;        /* If null, it's the head node or detached. */
    MA_ATOMIC ma_node* pInputNode;              /* The node that this output bus is attached to. Required for detaching. */    
};

/*
A node has multiple input buses. The output buses of a node are connecting to the input busses of
another. An input bus is essentially just a linked list of output buses.
*/
typedef struct ma_node_input_bus ma_node_input_bus;
struct ma_node_input_bus
{
    /* Mutable via multiple threads. */
    ma_node_output_bus head;            /* Dummy head node for simplifying some lock-free thread-safety stuff. */
    MA_ATOMIC ma_spinlock lock;         /* Unfortunate lock, but significantly simplifies the implementation. Required for thread-safe attaching and detaching. */
    MA_ATOMIC ma_uint16 nextCounter;    /* This is used to determine whether or not the input bus is finding the next node in the list. Used for thread safety when detaching output buses. */

    /* Set once at startup. */
    ma_uint8 channels;                  /* The number of channels in the audio stream for this bus. */
};


typedef struct ma_node_base ma_node_base;
struct ma_node_base
{
    /* These variables are set once at startup. */
    ma_node_graph* pNodeGraph;  /* The graph this node belongs to. */
    const ma_node_vtable* vtable;
    float* pCachedData;                     /* Allocated on the heap. Fixed size. Needs to be stored on the heap because reading from output buses is done in separate function calls. */
    ma_uint16 cachedDataCapInFramesPerBus;  /* The capacity of the input data cache in frames, per bus. */

    /* These variables are read and written only from the audio thread. */
    ma_uint16 cachedFrameCountOut;
    ma_uint16 cachedFrameCountIn;
    ma_uint16 consumedFrameCountIn;
    ma_uint32 readCounter;                  /* For loop prevention. Compared with the current read count of the node graph. If larger, means a loop was encountered and reading is aborted and no samples read. */
    
    /* These variables are read and written between different threads. */
    MA_ATOMIC ma_node_state state;          /* When set to stopped, nothing will be read, regardless of the times in stateTimes. */
    MA_ATOMIC ma_uint64 stateTimes[2];      /* Indexed by ma_node_state. Specifies the time based on the global clock that a node should be considered to be in the relevant state. */
    MA_ATOMIC ma_uint64 localTime;          /* The node's local clock. This is just a running sum of the number of output frames that have been processed. Can be modified by any thread with `ma_node_set_time()`. */
    ma_node_input_bus inputBuses[MA_MAX_NODE_BUS_COUNT];
    ma_node_output_bus outputBuses[MA_MAX_NODE_BUS_COUNT];
};

MA_API ma_result ma_node_init(ma_node_graph* pNodeGraph, const ma_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_node* pNode);
MA_API void ma_node_uninit(ma_node* pNode, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_node_graph* ma_node_get_node_graph(const ma_node* pNode);
MA_API ma_uint32 ma_node_get_input_bus_count(const ma_node* pNode);
MA_API ma_uint32 ma_node_get_output_bus_count(const ma_node* pNode);
MA_API ma_uint32 ma_node_get_input_channels(const ma_node* pNode, ma_uint32 inputBusIndex);
MA_API ma_uint32 ma_node_get_output_channels(const ma_node* pNode, ma_uint32 outputBusIndex);
MA_API ma_result ma_node_attach_output_bus(ma_node* pNode, ma_uint32 outputBusIndex, ma_node* pOtherNode, ma_uint32 otherNodeInputBusIndex);
MA_API ma_result ma_node_detach_output_bus(ma_node* pNode, ma_uint32 outputBusIndex);
MA_API ma_result ma_node_detach_all_output_buses(ma_node* pNode);
MA_API ma_result ma_node_set_output_bus_volume(ma_node* pNode, ma_uint32 outputBusIndex, float volume);
MA_API float ma_node_get_output_bus_volume(const ma_node* pNode, ma_uint32 outputBusIndex);
MA_API ma_result ma_node_set_state(ma_node* pNode, ma_node_state state);
MA_API ma_node_state ma_node_get_state(const ma_node* pNode);
MA_API ma_result ma_node_set_state_time(ma_node* pNode, ma_node_state state, ma_uint64 globalTime);
MA_API ma_uint64 ma_node_get_state_time(const ma_node* pNode, ma_node_state state);
MA_API ma_node_state ma_node_get_state_by_time_range(const ma_node* pNode, ma_uint64 globalTimeBeg, ma_uint64 globalTimeEnd);
MA_API ma_uint64 ma_node_get_time(const ma_node* pNode);
MA_API ma_result ma_node_set_time(ma_node* pNode, ma_uint64 localTime);



typedef struct
{
    ma_uint32 channels;
} ma_node_graph_config;

MA_API ma_node_graph_config ma_node_graph_config_init(ma_uint32 channels);


struct ma_node_graph
{
    /* Immutable. */
    ma_node_base endpoint;              /* Special node that all nodes eventually connect to. Data is read from this node in ma_node_graph_read_pcm_frames(). */

    /* Read and written by multiple threads. */
    MA_ATOMIC ma_uint32 readCounter;    /* Nodes spin on this while they wait for reading for finish before returning from ma_node_uninit(). */
    MA_ATOMIC ma_bool8 isReading;
};

MA_API ma_result ma_node_graph_init(const ma_node_graph_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_node_graph* pNodeGraph);
MA_API void ma_node_graph_uninit(ma_node_graph* pNodeGraph, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_node* ma_node_graph_get_endpoint(ma_node_graph* pNodeGraph);
MA_API ma_result ma_node_graph_read_pcm_frames(ma_node_graph* pNodeGraph, void* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead);
MA_API ma_uint32 ma_node_graph_get_channels(const ma_node_graph* pNodeGraph);
MA_API ma_uint64 ma_node_graph_get_time(const ma_node_graph* pNodeGraph);
MA_API ma_result ma_node_graph_set_time(ma_node_graph* pNodeGraph, ma_uint64 globalTime);



/* Data source node. 0 input buses, 1 output bus. Used for reading from a data source. */
typedef struct
{
    ma_node_config nodeConfig;
    ma_data_source* pDataSource;
    ma_bool32 looping;  /* Can be changed after initialization with ma_data_source_node_set_looping(). */
} ma_data_source_node_config;

MA_API ma_data_source_node_config ma_data_source_node_config_init(ma_data_source* pDataSource, ma_bool32 looping);


typedef struct
{
    ma_node_base base;
    ma_data_source* pDataSource;
    MA_ATOMIC ma_bool32 looping;  /* This can be modified and read across different threads. Must be used atomically. */
} ma_data_source_node;

MA_API ma_result ma_data_source_node_init(ma_node_graph* pNodeGraph, const ma_data_source_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source_node* pDataSourceNode);
MA_API void ma_data_source_node_uninit(ma_data_source_node* pDataSourceNode, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_result ma_data_source_node_set_looping(ma_data_source_node* pDataSourceNode, ma_bool32 looping);
MA_API ma_bool32 ma_data_source_node_is_looping(ma_data_source_node* pDataSourceNode);


/* Splitter Node. 1 input, 2 outputs. Used for splitting/copying a stream so it can be as input into two separate output nodes. */
typedef struct
{
    ma_node_config nodeConfig;
} ma_splitter_node_config;

MA_API ma_splitter_node_config ma_splitter_node_config_init(ma_uint32 channels);


typedef struct
{
    ma_node_base base;
} ma_splitter_node;

MA_API ma_result ma_splitter_node_init(ma_node_graph* pNodeGraph, const ma_splitter_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_splitter_node* pSplitterNode);
MA_API void ma_splitter_node_uninit(ma_splitter_node* pSplitterNode, const ma_allocation_callbacks* pAllocationCallbacks);




/*
Resource Manager Data Source Flags
==================================
The flags below are used for controlling how the resource manager should handle the loading and caching of data sources.
*/
#define MA_DATA_SOURCE_FLAG_STREAM      0x00000001  /* When set, does not load the entire data source in memory. Disk I/O will happen on job threads. */
#define MA_DATA_SOURCE_FLAG_DECODE      0x00000002  /* Decode data before storing in memory. When set, decoding is done at the resource manager level rather than the mixing thread. Results in faster mixing, but higher memory usage. */
#define MA_DATA_SOURCE_FLAG_ASYNC       0x00000004  /* When set, the resource manager will load the data source asynchronously. */
#define MA_DATA_SOURCE_FLAG_WAIT_INIT   0x00000008  /* When set, waits for initialization of the underlying data source before returning from ma_resource_manager_data_source_init(). */


typedef enum
{
    ma_resource_manager_data_buffer_encoding_encoded,
    ma_resource_manager_data_buffer_encoding_decoded
} ma_resource_manager_data_buffer_encoding;

/* The type of object that's used to connect a data buffer to a data source. */
typedef enum
{
    ma_resource_manager_data_buffer_connector_unknown,
    ma_resource_manager_data_buffer_connector_decoder,  /* ma_decoder */
    ma_resource_manager_data_buffer_connector_buffer    /* ma_audio_buffer */
} ma_resource_manager_data_buffer_connector;


typedef struct ma_resource_manager                  ma_resource_manager;
typedef struct ma_resource_manager_data_buffer_node ma_resource_manager_data_buffer_node;
typedef struct ma_resource_manager_data_buffer      ma_resource_manager_data_buffer;
typedef struct ma_resource_manager_data_stream      ma_resource_manager_data_stream;
typedef struct ma_resource_manager_data_source      ma_resource_manager_data_source;



#ifndef MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY
#define MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY  1024
#endif

#define MA_JOB_QUIT                 0x00000000
#define MA_JOB_LOAD_DATA_BUFFER     0x00000001
#define MA_JOB_FREE_DATA_BUFFER     0x00000002
#define MA_JOB_PAGE_DATA_BUFFER     0x00000003
#define MA_JOB_LOAD_DATA_STREAM     0x00000004
#define MA_JOB_FREE_DATA_STREAM     0x00000005
#define MA_JOB_PAGE_DATA_STREAM     0x00000006
#define MA_JOB_SEEK_DATA_STREAM     0x00000007
#define MA_JOB_CUSTOM               0x000000FF  /* Number your custom job codes as (MA_JOB_CUSTOM + 0), (MA_JOB_CUSTOM + 1), etc. */


/*
The idea of the slot allocator is for it to be used in conjunction with a fixed sized buffer. You use the slot allocator to allocator an index that can be used
as the insertion point for an object.

Slots are reference counted to help mitigate the ABA problem in the lock-free queue we use for tracking jobs.

The slot index is stored in the low 32 bits. The reference counter is stored in the high 32 bits:

    +-----------------+-----------------+
    | 32 Bits         | 32 Bits         |
    +-----------------+-----------------+
    | Reference Count | Slot Index      |
    +-----------------+-----------------+
*/
typedef struct
{
    struct
    {
        MA_ATOMIC ma_uint32 bitfield;                           /* Must be used atomically because the allocation and freeing routines need to make copies of this which must never be optimized away by the compiler. */
    } groups[MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY/32];
    ma_uint32 slots[MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY];    /* 32 bits for reference counting for ABA mitigation. */
    ma_uint32 count;    /* Allocation count. */
} ma_slot_allocator;

MA_API ma_result ma_slot_allocator_init(ma_slot_allocator* pAllocator);
MA_API ma_result ma_slot_allocator_alloc(ma_slot_allocator* pAllocator, ma_uint64* pSlot);
MA_API ma_result ma_slot_allocator_free(ma_slot_allocator* pAllocator, ma_uint64 slot);


/* Notification codes for ma_async_notification. Used to allow some granularity for notification callbacks. */
#define MA_NOTIFICATION_COMPLETE    0   /* Operation has fully completed. */
#define MA_NOTIFICATION_FAILED      1   /* Failed to initialize. */


/*
Notification callback for asynchronous operations.
*/
typedef void ma_async_notification;

typedef struct
{
    void (* onSignal)(ma_async_notification* pNotification, int code);
} ma_async_notification_callbacks;

MA_API ma_result ma_async_notification_signal(ma_async_notification* pNotification, int code);


/*
Event Notification

This notification signals an event internally on the MA_NOTIFICATION_COMPLETE and MA_NOTIFICATION_FAILED codes. All other codes are ignored.
*/
typedef struct
{
    ma_async_notification_callbacks cb;
    ma_event e;
} ma_async_notification_event;

MA_API ma_result ma_async_notification_event_init(ma_async_notification_event* pNotificationEvent);
MA_API ma_result ma_async_notification_event_uninit(ma_async_notification_event* pNotificationEvent);
MA_API ma_result ma_async_notification_event_wait(ma_async_notification_event* pNotificationEvent);
MA_API ma_result ma_async_notification_event_signal(ma_async_notification_event* pNotificationEvent);


typedef struct
{
    union
    {
        struct
        {
            ma_uint16 code;
            ma_uint16 slot;
            ma_uint32 refcount;
        };
        ma_uint64 allocation;
    } toc;  /* 8 bytes. We encode the job code into the slot allocation data to save space. */
    ma_uint64 next;     /* refcount + slot for the next item. Does not include the job code. */
    ma_uint32 order;    /* Execution order. Used to create a data dependency and ensure a job is executed in order. Usage is contextual depending on the job type. */

    union
    {
        /* Resource Managemer Jobs */
        struct
        {
            ma_resource_manager_data_buffer* pDataBuffer;
            char* pFilePath;
            ma_async_notification* pInitNotification;       /* Signalled when the data buffer has been initialized and the format/channels/rate can be retrieved. */
            ma_async_notification* pCompletedNotification;  /* Signalled when the data buffer has been fully decoded. */
        } loadDataBuffer;
        struct
        {
            ma_resource_manager_data_buffer* pDataBuffer;
            ma_async_notification* pNotification;
        } freeDataBuffer;
        struct
        {
            ma_resource_manager_data_buffer* pDataBuffer;
            ma_decoder* pDecoder;
            ma_async_notification* pCompletedNotification;  /* Signalled when the data buffer has been fully decoded. */
            void* pData;
            size_t dataSizeInBytes;
            ma_uint64 decodedFrameCount;
            ma_bool32 isUnknownLength;                      /* When set to true does not update the running frame count of the data buffer nor the data pointer until the last page has been decoded. */
        } pageDataBuffer;

        struct
        {
            ma_resource_manager_data_stream* pDataStream;
            char* pFilePath;                        /* Allocated when the job is posted, freed by the job thread after loading. */
            ma_async_notification* pNotification;   /* Signalled after the first two pages have been decoded and frames can be read from the stream. */
        } loadDataStream;
        struct
        {
            ma_resource_manager_data_stream* pDataStream;
            ma_async_notification* pNotification;
        } freeDataStream;
        struct
        {
            ma_resource_manager_data_stream* pDataStream;
            ma_uint32 pageIndex;                    /* The index of the page to decode into. */
        } pageDataStream;
        struct
        {
            ma_resource_manager_data_stream* pDataStream;
            ma_uint64 frameIndex;
        } seekDataStream;

        /* Others. */
        struct
        {
            ma_uintptr data0;
            ma_uintptr data1;
        } custom;
    };
} ma_job;

MA_API ma_job ma_job_init(ma_uint16 code);


#define MA_JOB_QUEUE_FLAG_NON_BLOCKING  0x00000001  /* When set, ma_job_queue_next() will not wait and no semaphore will be signaled in ma_job_queue_post(). ma_job_queue_next() will return MA_NO_DATA_AVAILABLE if nothing is available. */

typedef struct
{
    ma_uint32 flags;    /* Flags passed in at initialization time. */
    ma_uint64 head;     /* The first item in the list. Required for removing from the top of the list. */
    ma_uint64 tail;     /* The last item in the list. Required for appending to the end of the list. */
    ma_semaphore sem;   /* Only used when MA_JOB_QUEUE_ASYNC is unset. */
    ma_slot_allocator allocator;
    ma_job jobs[MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY];
} ma_job_queue;

MA_API ma_result ma_job_queue_init(ma_uint32 flags, ma_job_queue* pQueue);
MA_API ma_result ma_job_queue_uninit(ma_job_queue* pQueue);
MA_API ma_result ma_job_queue_post(ma_job_queue* pQueue, const ma_job* pJob);
MA_API ma_result ma_job_queue_next(ma_job_queue* pQueue, ma_job* pJob); /* Returns MA_CANCELLED if the next job is a quit job. */


/* Maximum job thread count will be restricted to this, but this may be removed later and replaced with a heap allocation thereby removing any limitation. */
#ifndef MA_RESOURCE_MANAGER_MAX_JOB_THREAD_COUNT
#define MA_RESOURCE_MANAGER_MAX_JOB_THREAD_COUNT    64
#endif

#define MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING       0x00000001  /* Indicates ma_resource_manager_next_job() should not block. Only valid with MA_RESOURCE_MANAGER_NO_JOB_THREAD. */   

typedef struct
{
    const void* pData;
    ma_uint64 frameCount;           /* The total number of PCM frames making up the decoded data. */
    ma_uint64 decodedFrameCount;    /* For async decoding. Keeps track of how many frames are *currently* decoded. */
    ma_format format;
    ma_uint32 channels;
    ma_uint32 sampleRate;
} ma_decoded_data;

typedef struct
{
    const void* pData;
    size_t sizeInBytes;
} ma_encoded_data;

typedef struct
{
    ma_resource_manager_data_buffer_encoding type;
    union
    {
        ma_decoded_data decoded;
        ma_encoded_data encoded;
    };
} ma_resource_manager_memory_buffer;

struct ma_resource_manager_data_buffer_node
{
    ma_uint32 hashedName32;                         /* The hashed name. This is the key. */
    ma_uint32 refCount;
    MA_ATOMIC ma_result result;                     /* Result from asynchronous loading. When loading set to MA_BUSY. When fully loaded set to MA_SUCCESS. When deleting set to MA_UNAVAILABLE. */
    ma_uint32 executionCounter;                     /* For allocating execution orders for jobs. */
    ma_uint32 executionPointer;                     /* For managing the order of execution for asynchronous jobs relating to this object. Incremented as jobs complete processing. */
    ma_bool32 isDataOwnedByResourceManager;         /* Set to true when the underlying data buffer was allocated the resource manager. Set to false if it is owned by the application (via ma_resource_manager_register_*()). */
    ma_resource_manager_memory_buffer data;
    ma_resource_manager_data_buffer_node* pParent;
    ma_resource_manager_data_buffer_node* pChildLo;
    ma_resource_manager_data_buffer_node* pChildHi;
};

struct ma_resource_manager_data_buffer
{
    ma_data_source_callbacks ds;                    /* Data source callbacks. A data buffer is a data source. */
    ma_resource_manager* pResourceManager;          /* A pointer to the resource manager that owns this buffer. */
    ma_uint32 flags;                                /* The flags that were passed used to initialize the buffer. */
    ma_resource_manager_data_buffer_node* pNode;    /* The data node. This is reference counted. */
    ma_uint64 cursorInPCMFrames;                    /* Only updated by the public API. Never written nor read from the job thread. */
    ma_uint64 lengthInPCMFrames;                    /* The total length of the sound in PCM frames. This is set at load time. */
    ma_bool32 seekToCursorOnNextRead;               /* On the next read we need to seek to the frame cursor. */
    MA_ATOMIC ma_bool32 isLooping;                  /* Can be read and written by different threads at the same time. Must be used atomically. */
    ma_resource_manager_data_buffer_connector connectorType;
    union
    {
        ma_decoder decoder;
        ma_audio_buffer buffer;
    } connector;
};

struct ma_resource_manager_data_stream
{
    ma_data_source_callbacks ds;            /* Data source callbacks. A data stream is a data source. */
    ma_resource_manager* pResourceManager;  /* A pointer to the resource manager that owns this data stream. */
    ma_uint32 flags;                        /* The flags that were passed used to initialize the stream. */
    ma_decoder decoder;                     /* Used for filling pages with data. This is only ever accessed by the job thread. The public API should never touch this. */
    ma_bool32 isDecoderInitialized;         /* Required for determining whether or not the decoder should be uninitialized in MA_JOB_FREE_DATA_STREAM. */
    ma_uint64 totalLengthInPCMFrames;       /* This is calculated when first loaded by the MA_JOB_LOAD_DATA_STREAM. */
    ma_uint32 relativeCursor;               /* The playback cursor, relative to the current page. Only ever accessed by the public API. Never accessed by the job thread. */
    ma_uint64 absoluteCursor;               /* The playback cursor, in absolute position starting from the start of the file. */
    ma_uint32 currentPageIndex;             /* Toggles between 0 and 1. Index 0 is the first half of pPageData. Index 1 is the second half. Only ever accessed by the public API. Never accessed by the job thread. */
    ma_uint32 executionCounter;             /* For allocating execution orders for jobs. */
    ma_uint32 executionPointer;             /* For managing the order of execution for asynchronous jobs relating to this object. Incremented as jobs complete processing. */

    /* Written by the public API, read by the job thread. */
    MA_ATOMIC ma_bool32 isLooping;          /* Whether or not the stream is looping. It's important to set the looping flag at the data stream level for smooth loop transitions. */

    /* Written by the job thread, read by the public API. */
    void* pPageData;                        /* Buffer containing the decoded data of each page. Allocated once at initialization time. */
    MA_ATOMIC ma_uint32 pageFrameCount[2];  /* The number of valid PCM frames in each page. Used to determine the last valid frame. */

    /* Written and read by both the public API and the job thread. These must be atomic. */
    MA_ATOMIC ma_result result;             /* Result from asynchronous loading. When loading set to MA_BUSY. When initialized set to MA_SUCCESS. When deleting set to MA_UNAVAILABLE. If an error occurs when loading, set to an error code. */
    MA_ATOMIC ma_bool32 isDecoderAtEnd;     /* Whether or not the decoder has reached the end. */
    MA_ATOMIC ma_bool32 isPageValid[2];     /* Booleans to indicate whether or not a page is valid. Set to false by the public API, set to true by the job thread. Set to false as the pages are consumed, true when they are filled. */
    MA_ATOMIC ma_bool32 seekCounter;        /* When 0, no seeking is being performed. When > 0, a seek is being performed and reading should be delayed with MA_BUSY. */
};

struct ma_resource_manager_data_source
{
    union
    {
        ma_resource_manager_data_buffer buffer;
        ma_resource_manager_data_stream stream;
    };  /* Must be the first item because we need the first item to be the data source callbacks for the buffer or stream. */

    ma_uint32 flags;                /* The flags that were passed in to ma_resource_manager_data_source_init(). */
    ma_uint32 executionCounter;     /* For allocating execution orders for jobs. */
    ma_uint32 executionPointer;     /* For managing the order of execution for asynchronous jobs relating to this object. Incremented as jobs complete processing. */
};

typedef struct
{
    ma_allocation_callbacks allocationCallbacks;
    ma_format decodedFormat;        /* The decoded format to use. Set to ma_format_unknown (default) to use the file's native format. */
    ma_uint32 decodedChannels;      /* The decoded channel count to use. Set to 0 (default) to use the file's native channel count. */
    ma_uint32 decodedSampleRate;    /* the decoded sample rate to use. Set to 0 (default) to use the file's native sample rate. */
    ma_uint32 jobThreadCount;       /* Set to 0 if you want to self-manage your job threads. Defaults to 1. */
    ma_uint32 flags;
    ma_vfs* pVFS;                   /* Can be NULL in which case defaults will be used. */
} ma_resource_manager_config;

MA_API ma_resource_manager_config ma_resource_manager_config_init();

struct ma_resource_manager
{
    ma_resource_manager_config config;
    ma_resource_manager_data_buffer_node* pRootDataBufferNode;      /* The root buffer in the binary tree. */
    ma_mutex dataBufferLock;                                        /* For synchronizing access to the data buffer binary tree. */
    ma_thread jobThreads[MA_RESOURCE_MANAGER_MAX_JOB_THREAD_COUNT]; /* The thread for executing jobs. Will probably turn this into an array. */
    ma_job_queue jobQueue;                                          /* Lock-free multi-consumer, multi-producer job queue for managing jobs for asynchronous decoding and streaming. */
    ma_default_vfs defaultVFS;                                      /* Only used if a custom VFS is not specified. */
};

/* Init. */
MA_API ma_result ma_resource_manager_init(const ma_resource_manager_config* pConfig, ma_resource_manager* pResourceManager);
MA_API void ma_resource_manager_uninit(ma_resource_manager* pResourceManager);

/* Registration. */
MA_API ma_result ma_resource_manager_register_decoded_data(ma_resource_manager* pResourceManager, const char* pName, const void* pData, ma_uint64 frameCount, ma_format format, ma_uint32 channels, ma_uint32 sampleRate);  /* Does not copy. Increments the reference count if already exists and returns MA_SUCCESS. */
MA_API ma_result ma_resource_manager_register_encoded_data(ma_resource_manager* pResourceManager, const char* pName, const void* pData, size_t sizeInBytes);    /* Does not copy. Increments the reference count if already exists and returns MA_SUCCESS. */
MA_API ma_result ma_resource_manager_unregister_data(ma_resource_manager* pResourceManager, const char* pName);

/* Data Buffers. */
MA_API ma_result ma_resource_manager_data_buffer_init(ma_resource_manager* pResourceManager, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_buffer* pDataBuffer);
MA_API ma_result ma_resource_manager_data_buffer_uninit(ma_resource_manager_data_buffer* pDataBuffer);
MA_API ma_result ma_resource_manager_data_buffer_read_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead);
MA_API ma_result ma_resource_manager_data_buffer_seek_to_pcm_frame(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64 frameIndex);
MA_API ma_result ma_resource_manager_data_buffer_map(ma_resource_manager_data_buffer* pDataBuffer, void** ppFramesOut, ma_uint64* pFrameCount);
MA_API ma_result ma_resource_manager_data_buffer_unmap(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64 frameCount);
MA_API ma_result ma_resource_manager_data_buffer_get_data_format(ma_resource_manager_data_buffer* pDataBuffer, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate);
MA_API ma_result ma_resource_manager_data_buffer_get_cursor_in_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pCursor);
MA_API ma_result ma_resource_manager_data_buffer_get_length_in_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pLength);
MA_API ma_result ma_resource_manager_data_buffer_result(const ma_resource_manager_data_buffer* pDataBuffer);
MA_API ma_result ma_resource_manager_data_buffer_set_looping(ma_resource_manager_data_buffer* pDataBuffer, ma_bool32 isLooping);
MA_API ma_result ma_resource_manager_data_buffer_get_looping(const ma_resource_manager_data_buffer* pDataBuffer, ma_bool32* pIsLooping);
MA_API ma_result ma_resource_manager_data_buffer_get_available_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pAvailableFrames);

/* Data Streams. */
MA_API ma_result ma_resource_manager_data_stream_init(ma_resource_manager* pResourceManager, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_stream* pDataStream);
MA_API ma_result ma_resource_manager_data_stream_uninit(ma_resource_manager_data_stream* pDataStream);
MA_API ma_result ma_resource_manager_data_stream_read_pcm_frames(ma_resource_manager_data_stream* pDataStream, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead);
MA_API ma_result ma_resource_manager_data_stream_seek_to_pcm_frame(ma_resource_manager_data_stream* pDataStream, ma_uint64 frameIndex);
MA_API ma_result ma_resource_manager_data_stream_map(ma_resource_manager_data_stream* pDataStream, void** ppFramesOut, ma_uint64* pFrameCount);
MA_API ma_result ma_resource_manager_data_stream_unmap(ma_resource_manager_data_stream* pDataStream, ma_uint64 frameCount);
MA_API ma_result ma_resource_manager_data_stream_get_data_format(ma_resource_manager_data_stream* pDataStream, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate);
MA_API ma_result ma_resource_manager_data_stream_get_cursor_in_pcm_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pCursor);
MA_API ma_result ma_resource_manager_data_stream_get_length_in_pcm_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pLength);
MA_API ma_result ma_resource_manager_data_stream_result(const ma_resource_manager_data_stream* pDataStream);
MA_API ma_result ma_resource_manager_data_stream_set_looping(ma_resource_manager_data_stream* pDataStream, ma_bool32 isLooping);
MA_API ma_result ma_resource_manager_data_stream_get_looping(const ma_resource_manager_data_stream* pDataStream, ma_bool32* pIsLooping);
MA_API ma_result ma_resource_manager_data_stream_get_available_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pAvailableFrames);

/* Data Sources. */
MA_API ma_result ma_resource_manager_data_source_init(ma_resource_manager* pResourceManager, const char* pName, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_source* pDataSource);
MA_API ma_result ma_resource_manager_data_source_uninit(ma_resource_manager_data_source* pDataSource);
MA_API ma_result ma_resource_manager_data_source_read_pcm_frames(ma_resource_manager_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead);
MA_API ma_result ma_resource_manager_data_source_seek_to_pcm_frame(ma_resource_manager_data_source* pDataSource, ma_uint64 frameIndex);
MA_API ma_result ma_resource_manager_data_source_map(ma_resource_manager_data_source* pDataSource, void** ppFramesOut, ma_uint64* pFrameCount);
MA_API ma_result ma_resource_manager_data_source_unmap(ma_resource_manager_data_source* pDataSource, ma_uint64 frameCount);
MA_API ma_result ma_resource_manager_data_source_get_data_format(ma_resource_manager_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate);
MA_API ma_result ma_resource_manager_data_source_get_cursor_in_pcm_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pCursor);
MA_API ma_result ma_resource_manager_data_source_get_length_in_pcm_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pLength);
MA_API ma_result ma_resource_manager_data_source_result(const ma_resource_manager_data_source* pDataSource);
MA_API ma_result ma_resource_manager_data_source_set_looping(ma_resource_manager_data_source* pDataSource, ma_bool32 isLooping);
MA_API ma_result ma_resource_manager_data_source_get_looping(const ma_resource_manager_data_source* pDataSource, ma_bool32* pIsLooping);
MA_API ma_result ma_resource_manager_data_source_get_available_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pAvailableFrames);

/* Job management. */
MA_API ma_result ma_resource_manager_post_job(ma_resource_manager* pResourceManager, const ma_job* pJob);
MA_API ma_result ma_resource_manager_post_job_quit(ma_resource_manager* pResourceManager);  /* Helper for posting a quit job. */
MA_API ma_result ma_resource_manager_next_job(ma_resource_manager* pResourceManager, ma_job* pJob);
MA_API ma_result ma_resource_manager_process_job(ma_resource_manager* pResourceManager, ma_job* pJob);
MA_API ma_result ma_resource_manager_process_next_job(ma_resource_manager* pResourceManager);   /* Returns MA_CANCELLED if a MA_JOB_QUIT job is found. In non-blocking mode, returns MA_NO_DATA_AVAILABLE if no jobs are available. */


/*
Engine
======
The `ma_engine` API is a high-level API for audio playback. Internally it contains sounds (`ma_sound`) with resources managed via a resource manager
(`ma_resource_manager`).

Within the world there is the concept of a "listener". Each `ma_engine` instances has a single listener, but you can instantiate multiple `ma_engine` instances
if you need more than one listener. In this case you will want to share a resource manager which you can do by initializing one manually and passing it into
`ma_engine_config`. Using this method will require your application to manage groups and sounds on a per `ma_engine` basis.
*/
typedef struct ma_engine        ma_engine;
typedef struct ma_sound         ma_sound;
typedef struct ma_sound_group   ma_sound_group;
typedef struct ma_listener      ma_listener;

typedef struct
{
    float x;
    float y;
    float z;
} ma_vec3;

static MA_INLINE ma_vec3 ma_vec3f(float x, float y, float z)
{
    ma_vec3 v;
    v.x = x;
    v.y = y;
    v.z = z;
    return v;
}


typedef struct
{
    float x;
    float y;
    float z;
    float w;
} ma_quat;

static MA_INLINE ma_quat ma_quatf(float x, float y, float z, float w)
{
    ma_quat q;
    q.x = x;
    q.y = y;
    q.z = z;
    q.w = w;
    return q;
}


/* Stereo panner. */
typedef enum
{
    ma_pan_mode_balance = 0,    /* Does not blend one side with the other. Technically just a balance. Compatible with other popular audio engines and therefore the default. */
    ma_pan_mode_pan             /* A true pan. The sound from one side will "move" to the other side and blend with it. */
} ma_pan_mode;

typedef struct
{
    ma_format format;
    ma_uint32 channels;
    ma_pan_mode mode;
    float pan;
} ma_panner_config;

MA_API ma_panner_config ma_panner_config_init(ma_format format, ma_uint32 channels);


typedef struct
{
    ma_format format;
    ma_uint32 channels;
    ma_pan_mode mode;
    float pan;  /* -1..1 where 0 is no pan, -1 is left side, +1 is right side. Defaults to 0. */
} ma_panner;

MA_API ma_result ma_panner_init(const ma_panner_config* pConfig, ma_panner* pPanner);
MA_API ma_result ma_panner_process_pcm_frames(ma_panner* pPanner, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount);
MA_API ma_result ma_panner_set_mode(ma_panner* pPanner, ma_pan_mode mode);
MA_API ma_result ma_panner_set_pan(ma_panner* pPanner, float pan);



/* Spatializer. */
typedef struct
{
    ma_uint32 channelsIn;
    ma_uint32 channelsOut;
    ma_vec3 position;
    ma_quat rotation;
} ma_spatializer_config;

MA_API ma_spatializer_config ma_spatializer_config_init(ma_uint32 channelsIn, ma_uint32 channelsOut);


typedef struct
{
    ma_uint32 channelsIn;
    ma_uint32 channelsOut;
    ma_vec3 position;
    ma_quat rotation;
} ma_spatializer;

MA_API ma_result ma_spatializer_init(const ma_spatializer_config* pConfig, ma_spatializer* pSpatializer);
MA_API ma_result ma_spatializer_process_pcm_frames(ma_spatializer* pSpatializer, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount);
MA_API ma_result ma_spatializer_set_position(ma_spatializer* pSpatializer, ma_vec3 position);
MA_API ma_result ma_spatializer_set_rotation(ma_spatializer* pSpatializer, ma_quat rotation);


/* Fader. */
typedef struct
{
    ma_format format;
    ma_uint32 channels;
    ma_uint32 sampleRate;
} ma_fader_config;

MA_API ma_fader_config ma_fader_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate);

typedef struct
{
    ma_fader_config config;
    float volumeBeg;            /* If volumeBeg and volumeEnd is equal to 1, no fading happens (ma_fader_process_pcm_frames() will run as a passthrough). */
    float volumeEnd;
    ma_uint64 lengthInFrames;   /* The total length of the fade. */
    ma_uint64 cursorInFrames;   /* The current time in frames. Incremented by ma_fader_process_pcm_frames(). */
} ma_fader;

MA_API ma_result ma_fader_init(const ma_fader_config* pConfig, ma_fader* pFader);
MA_API ma_result ma_fader_process_pcm_frames(ma_fader* pFader, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount);
MA_API ma_result ma_fader_get_data_format(const ma_fader* pFader, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate);
MA_API ma_result ma_fader_set_fade(ma_fader* pFader, float volumeBeg, float volumeEnd, ma_uint64 lengthInFrames);
MA_API ma_result ma_fader_get_current_volume(ma_fader* pFader, float* pVolume);



/* Sound flags. */
#define MA_SOUND_FLAG_STREAM                MA_DATA_SOURCE_FLAG_STREAM      /* 0x00000001 */
#define MA_SOUND_FLAG_DECODE                MA_DATA_SOURCE_FLAG_DECODE      /* 0x00000002 */
#define MA_SOUND_FLAG_ASYNC                 MA_DATA_SOURCE_FLAG_ASYNC       /* 0x00000004 */
#define MA_SOUND_FLAG_WAIT_INIT             MA_DATA_SOURCE_FLAG_WAIT_INIT   /* 0x00000008 */
#define MA_SOUND_FLAG_NO_DEFAULT_ATTACHMENT 0x00000010  /* Do not attach to the endpoint by default. Useful for when setting up nodes in a complex graph system. */
#define MA_SOUND_FLAG_DISABLE_PITCH         0x00000020  /* Disable pitch shifting with ma_sound_set_pitch() and ma_sound_group_set_pitch(). This is an optimization. */


typedef enum
{
    ma_engine_node_type_sound,
    ma_engine_node_type_group
} ma_engine_node_type;

typedef struct
{
    ma_engine* pEngine;
    ma_engine_node_type type;
    ma_uint32 channels;             /* Only used when the type is set to ma_engine_node_type_sound. */
    ma_bool8 isPitchDisabled;       /* Pitching can be explicitly disable with MA_SOUND_FLAG_DISABLE_PITCH to optimize processing. */
} ma_engine_node_config;

MA_API ma_engine_node_config ma_engine_node_config_init(ma_engine* pEngine, ma_engine_node_type type, ma_uint32 flags);


/* Base node object for both ma_sound and ma_sound_group. */
typedef struct
{
    ma_node_base baseNode;          /* Must be the first member for compatiblity with the ma_node API. */
    ma_engine* pEngine;             /* A pointer to the engine. Set based on the value from the config. */
    ma_fader fader;
    ma_resampler resampler;         /* For pitch shift. May change this to ma_linear_resampler later. */
    ma_spatializer spatializer;
    ma_panner panner;
    float pitch;
    float oldPitch;                 /* For determining whether or not the resampler needs to be updated to reflect the new pitch. The resampler will be updated on the mixing thread. */
    ma_bool8 isPitchDisabled;       /* When set to true, pitching will be disabled which will allow the resampler to be bypassed to save some computation. */
    ma_bool8 isSpatial;             /* Set to false by default. When set to false, will not have spatialisation applied. */
} ma_engine_node;

MA_API ma_result ma_engine_node_init(const ma_engine_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_engine_node* pEngineNode);
MA_API void ma_engine_node_uninit(ma_engine_node* pEngineNode, const ma_allocation_callbacks* pAllocationCallbacks);
MA_API ma_result ma_engine_node_reset(ma_engine_node* pEngineNode); /* This is used when sounds are recycled from ma_engine_play_sound(). */


struct ma_sound
{
    ma_engine_node engineNode;                  /* Must be the first member for compatibility with the ma_node API. */
    ma_data_source* pDataSource;
    ma_uint64 seekTarget;                       /* The PCM frame index to seek to in the mixing thread. Set to (~(ma_uint64)0) to not perform any seeking. */
    MA_ATOMIC ma_bool8 isLooping;                /* False by default. */
    MA_ATOMIC ma_bool8 atEnd;
    ma_bool8 ownsDataSource;

    /*
    We're declaring a resource manager data source object here to save us a malloc when loading a
    sound via the resource manager, which I *think* will be the most common scenario.
    */
#ifndef MA_NO_RESOURCE_MANAGER
    ma_resource_manager_data_source resourceManagerDataSource;
#endif
};

/* Structure specifically for sounds played with ma_engine_play_sound(). Making this a separate structure to reduce overhead. */
typedef struct ma_sound_inlined ma_sound_inlined;
struct ma_sound_inlined
{
    ma_sound sound;
    ma_sound_inlined* pNext;
    ma_sound_inlined* pPrev;
};

struct ma_sound_group
{
    ma_engine_node engineNode;                  /* Must be the first member for compatibility with the ma_node API. */
};

struct ma_listener
{
    ma_vec3 position;
    ma_quat rotation;
};


typedef struct
{
    ma_resource_manager* pResourceManager;  /* Can be null in which case a resource manager will be created for you. */
    ma_context* pContext;
    ma_device* pDevice;                     /* If set, the caller is responsible for calling ma_engine_data_callback() in the device's data callback. */
    ma_uint32 channels;                     /* The number of channels to use when mixing and spatializing. When set to 0, will use the native channel count of the device. */
    ma_uint32 sampleRate;                   /* The sample rate. When set to 0 will use the native channel count of the device. */
    ma_uint32 periodSizeInFrames;           /* If set to something other than 0, updates will always be exactly this size. The underlying device may be a different size, but from the perspective of the mixer that won't matter.*/
    ma_uint32 periodSizeInMilliseconds;     /* Used if periodSizeInFrames is unset. */
    ma_device_id* pPlaybackDeviceID;        /* The ID of the playback device to use with the default listener. */
    ma_allocation_callbacks allocationCallbacks;
    ma_bool32 noAutoStart;                  /* When set to true, requires an explicit call to ma_engine_start(). This is false by default, meaning the engine will be started automatically in ma_engine_init(). */
    ma_vfs* pResourceManagerVFS;            /* A pointer to a pre-allocated VFS object to use with the resource manager. This is ignored if pResourceManager is not NULL. */
} ma_engine_config;

MA_API ma_engine_config ma_engine_config_init_default(void);


struct ma_engine
{
    ma_node_graph nodeGraph;                /* An engine is a node graph. It should be able to be plugged into any ma_node_graph API (with a cast) which means this must be the first member of this struct. */
    ma_resource_manager* pResourceManager;
    ma_device* pDevice;                     /* Optionally set via the config, otherwise allocated by the engine in ma_engine_init(). */
    ma_listener listener;
    ma_uint32 sampleRate;               /* TODO: Get this from the device? Is this needed when supporting non-device engines? */
    ma_allocation_callbacks allocationCallbacks;
    ma_bool8 ownsResourceManager;
    ma_bool8 ownsDevice;
    ma_mutex inlinedSoundLock;              /* For synchronizing access so the inlined sound list. */
    ma_sound_inlined* pInlinedSoundHead;    /* The first inlined sound. Inlined sounds are tracked in a linked list. */
    MA_ATOMIC ma_uint32 inlinedSoundCount;  /* The total number of allocated inlined sound objects. Used for debugging. */
};

MA_API ma_result ma_engine_init(const ma_engine_config* pConfig, ma_engine* pEngine);
MA_API void ma_engine_uninit(ma_engine* pEngine);
MA_API ma_result ma_engine_read_pcm_frames(ma_engine* pEngine, void* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead);
MA_API void ma_engine_data_callback(ma_engine* pEngine, void* pOutput, const void* pInput, ma_uint32 frameCount);
MA_API ma_node* ma_engine_get_endpoint(ma_engine* pEngine);
MA_API ma_uint64 ma_engine_get_time(const ma_engine* pEngine);
MA_API ma_uint32 ma_engine_get_channels(const ma_engine* pEngine);
MA_API ma_uint32 ma_engine_get_sample_rate(const ma_engine* pEngine);

MA_API ma_result ma_engine_start(ma_engine* pEngine);
MA_API ma_result ma_engine_stop(ma_engine* pEngine);
MA_API ma_result ma_engine_set_volume(ma_engine* pEngine, float volume);
MA_API ma_result ma_engine_set_gain_db(ma_engine* pEngine, float gainDB);

MA_API ma_result ma_engine_listener_set_position(ma_engine* pEngine, ma_vec3 position);
MA_API ma_result ma_engine_listener_set_rotation(ma_engine* pEngine, ma_quat rotation);

MA_API ma_result ma_engine_play_sound(ma_engine* pEngine, const char* pFilePath, ma_sound_group* pGroup);   /* Fire and forget. */


#ifndef MA_NO_RESOURCE_MANAGER
MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound);
#endif
MA_API ma_result ma_sound_init_from_data_source(ma_engine* pEngine, ma_data_source* pDataSource, ma_uint32 flags, ma_sound_group* pGroup, ma_sound* pSound);
MA_API void ma_sound_uninit(ma_sound* pSound);
MA_API ma_result ma_sound_start(ma_sound* pSound);
MA_API ma_result ma_sound_stop(ma_sound* pSound);
MA_API ma_result ma_sound_set_volume(ma_sound* pSound, float volume);
MA_API ma_result ma_sound_set_gain_db(ma_sound* pSound, float gainDB);
MA_API ma_result ma_sound_set_pan(ma_sound* pSound, float pan);
MA_API ma_result ma_sound_set_pan_mode(ma_sound* pSound, ma_pan_mode pan_mode);
MA_API ma_result ma_sound_set_pitch(ma_sound* pSound, float pitch);
MA_API ma_result ma_sound_set_position(ma_sound* pSound, ma_vec3 position);
MA_API ma_result ma_sound_set_rotation(ma_sound* pSound, ma_quat rotation);
MA_API ma_result ma_sound_set_looping(ma_sound* pSound, ma_bool8 isLooping);
MA_API ma_bool32 ma_sound_is_looping(const ma_sound* pSound);
MA_API ma_result ma_sound_set_fade_in_frames(ma_sound* pSound, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInFrames);
MA_API ma_result ma_sound_set_fade_in_milliseconds(ma_sound* pSound, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInMilliseconds);
MA_API ma_result ma_sound_get_current_fade_volume(ma_sound* pSound, float* pVolume);
MA_API ma_result ma_sound_set_start_time(ma_sound* pSound, ma_uint64 absoluteGlobalTimeInFrames);
MA_API ma_result ma_sound_set_stop_time(ma_sound* pSound, ma_uint64 absoluteGlobalTimeInFrames);
MA_API ma_bool32 ma_sound_is_playing(const ma_sound* pSound);
MA_API ma_bool32 ma_sound_at_end(const ma_sound* pSound);
MA_API ma_result ma_sound_get_time_in_frames(const ma_sound* pSound, ma_uint64* pTimeInFrames);
MA_API ma_result ma_sound_seek_to_pcm_frame(ma_sound* pSound, ma_uint64 frameIndex); /* Just a wrapper around ma_data_source_seek_to_pcm_frame(). */
MA_API ma_result ma_sound_get_data_format(ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate);
MA_API ma_result ma_sound_get_cursor_in_pcm_frames(ma_sound* pSound, ma_uint64* pCursor);
MA_API ma_result ma_sound_get_length_in_pcm_frames(ma_sound* pSound, ma_uint64* pLength);

MA_API ma_result ma_sound_group_init(ma_engine* pEngine, ma_uint32 flags, ma_sound_group* pParentGroup, ma_sound_group* pGroup);  /* Parent must be set at initialization time and cannot be changed. Not thread-safe. */
MA_API void ma_sound_group_uninit(ma_sound_group* pGroup);   /* Not thread-safe. */
MA_API ma_result ma_sound_group_start(ma_sound_group* pGroup);
MA_API ma_result ma_sound_group_stop(ma_sound_group* pGroup);
MA_API ma_result ma_sound_group_set_volume(ma_sound_group* pGroup, float volume);
MA_API ma_result ma_sound_group_set_gain_db(ma_sound_group* pGroup, float gainDB);
MA_API ma_result ma_sound_group_set_pan(ma_sound_group* pGroup, float pan);
MA_API ma_result ma_sound_group_set_pitch(ma_sound_group* pGroup, float pitch);
MA_API ma_result ma_sound_group_set_fade_in_frames(ma_sound_group* pGroup, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInFrames);
MA_API ma_result ma_sound_group_set_fade_in_milliseconds(ma_sound_group* pGroup, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInMilliseconds);
MA_API ma_result ma_sound_group_get_current_fade_volume(ma_sound_group* pGroup, float* pVolume);
MA_API ma_result ma_sound_group_set_start_time(ma_sound_group* pGroup, ma_uint64 absoluteGlobalTimeInFrames);
MA_API ma_result ma_sound_group_set_stop_time(ma_sound_group* pGroup, ma_uint64 absoluteGlobalTimeInFrames);
MA_API ma_bool32 ma_sound_group_is_playing(const ma_sound_group* pGroup);
MA_API ma_result ma_sound_group_get_time_in_frames(const ma_sound_group* pGroup, ma_uint64* pTimeInFrames);

#ifdef __cplusplus
}
#endif
#endif  /* miniaudio_engine_h */


#if defined(MA_IMPLEMENTATION) || defined(MINIAUDIO_IMPLEMENTATION)

MA_API size_t ma_get_accumulation_bytes_per_sample(ma_format format)
{
    size_t bytesPerSample[ma_format_count] = {
        0,                  /* ma_format_unknown */
        sizeof(ma_int16),   /* ma_format_u8  */
        sizeof(ma_int32),   /* ma_format_s16 */
        sizeof(ma_int64),   /* ma_format_s24 */
        sizeof(ma_int64),   /* ma_format_s32 */
        sizeof(float)       /* ma_format_f32 */
    };

    return bytesPerSample[format];
}

MA_API size_t ma_get_accumulation_bytes_per_frame(ma_format format, ma_uint32 channels)
{
    return ma_get_accumulation_bytes_per_sample(format) * channels;
}



/* 10ms @ 48K = 480. Must never exceed 65535. */
#ifndef MA_DEFAULT_NODE_CACHE_CAP_IN_FRAMES_PER_BUS
#define MA_DEFAULT_NODE_CACHE_CAP_IN_FRAMES_PER_BUS 480
#endif


static ma_result ma_node_read_pcm_frames(ma_node* pNode, ma_uint32 outputBusIndex, float* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead, ma_uint64 globalTime);


static void ma_debug_fill_pcm_frames_with_sine_wave(float* pFramesOut, ma_uint32 frameCount, ma_format format, ma_uint32 channels, ma_uint32 sampleRate)
{
    ma_waveform_config waveformConfig;
    ma_waveform waveform;

    waveformConfig = ma_waveform_config_init(format, channels, sampleRate, ma_waveform_type_sine, 1.0, 400);
    ma_waveform_init(&waveformConfig, &waveform);
    ma_waveform_read_pcm_frames(&waveform, pFramesOut, frameCount);
}



static MA_INLINE ma_int16 ma_float_to_fixed_16(float x)
{
    return (ma_int16)(x * (1 << 8));
}


static MA_INLINE ma_int16 ma_apply_volume_unclipped_u8(ma_int16 x, ma_int16 volume)
{
    return (ma_int16)(((ma_int32)x * (ma_int32)volume) >> 8);
}

static MA_INLINE ma_int32 ma_apply_volume_unclipped_s16(ma_int32 x, ma_int16 volume)
{
    return (ma_int32)((x * volume) >> 8);
}

static MA_INLINE ma_int64 ma_apply_volume_unclipped_s24(ma_int64 x, ma_int16 volume)
{
    return (ma_int64)((x * volume) >> 8);
}

static MA_INLINE ma_int64 ma_apply_volume_unclipped_s32(ma_int64 x, ma_int16 volume)
{
    return (ma_int64)((x * volume) >> 8);
}

static MA_INLINE float ma_apply_volume_unclipped_f32(float x, float volume)
{
    return x * volume;
}



static void ma_convert_pcm_frames_format_and_channels(void* pDst, ma_format formatOut, ma_uint32 channelsOut, const void* pSrc, ma_format formatIn, ma_uint32 channelsIn, ma_uint64 frameCount, ma_dither_mode ditherMode)
{
    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    if (channelsOut == channelsIn) {
        /* Only format conversion required. */
        if (formatOut == formatIn) {
            /* No data conversion required at all - just copy. */
            if (pDst == pSrc) {
                /* No-op. */
            } else {
                ma_copy_pcm_frames(pDst, pSrc, frameCount, formatOut, channelsOut);
            }
        } else {
            /* Simple format conversion. */
            ma_convert_pcm_frames_format(pDst, formatOut, pSrc, formatIn, frameCount, channelsOut, ditherMode);
        }
    } else {
        /* Getting here means we require a channel converter. We do channel conversion in the input format, and then format convert as a post process step if required. */
        ma_result result;
        ma_channel_converter_config channelConverterConfig;
        ma_channel_converter channelConverter;

        channelConverterConfig = ma_channel_converter_config_init(formatIn, channelsIn, NULL, channelsOut, NULL, ma_channel_mix_mode_default);
        result = ma_channel_converter_init(&channelConverterConfig, &channelConverter);
        if (result != MA_SUCCESS) {
            return; /* Failed to initialize channel converter for some reason. Should never fail. */
        }

        /* If we don't require any format conversion we can output straight into the output buffer. Otherwise we need to use an intermediary. */
        if (formatOut == formatIn) {
            /* No format conversion required. Output straight to the output buffer. */
            ma_channel_converter_process_pcm_frames(&channelConverter, pDst, pSrc, frameCount);
        } else {
            /* Format conversion required. We need to use an intermediary buffer. */
            ma_uint8  buffer[MA_DATA_CONVERTER_STACK_BUFFER_SIZE]; /* formatIn, channelsOut */
            ma_uint32 bufferCap = sizeof(buffer) / ma_get_bytes_per_frame(formatIn, channelsOut);
            ma_uint64 totalFramesProcessed = 0;
            
            while (totalFramesProcessed < frameCount) {
                ma_uint64 framesToProcess = frameCount - totalFramesProcessed;
                if (framesToProcess > bufferCap) {
                    framesToProcess = bufferCap;
                }

                result = ma_channel_converter_process_pcm_frames(&channelConverter, buffer, ma_offset_ptr(pSrc, totalFramesProcessed * ma_get_bytes_per_frame(formatIn, channelsIn)), framesToProcess);
                if (result != MA_SUCCESS) {
                    break;
                }

                /* Channel conversion is done, now format conversion straight into the output buffer. */
                ma_convert_pcm_frames_format(ma_offset_ptr(pDst, totalFramesProcessed * ma_get_bytes_per_frame(formatOut, channelsOut)), formatOut, buffer, formatIn, framesToProcess, channelsOut, ditherMode);

                totalFramesProcessed += framesToProcess;
            }
        }
    }
}

static void ma_convert_pcm_frames_channels_f32(float* pFramesOut, ma_uint32 channelsOut, const float* pFramesIn, ma_uint32 channelsIn, ma_uint64 frameCount)
{
    ma_convert_pcm_frames_format_and_channels(pFramesOut, ma_format_f32, channelsOut, pFramesIn, ma_format_f32, channelsIn, frameCount, ma_dither_mode_none);
}


static ma_result ma_mix_pcm_frames_u8(ma_int16* pDst, const ma_uint8* pSrc, ma_uint64 frameCount, ma_uint32 channels, float volume)
{
    ma_uint64 iSample;
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL || channels == 0) {
        return MA_INVALID_ARGS;
    }

    if (volume == 0) {
        return MA_SUCCESS;  /* No changes if the volume is 0. */
    }
    
    sampleCount = frameCount * channels;

    if (volume == 1) {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_pcm_sample_u8_to_s16_no_scale(pSrc[iSample]);
        }
    } else {
        ma_int16 volumeFixed = ma_float_to_fixed_16(volume);
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_apply_volume_unclipped_u8(ma_pcm_sample_u8_to_s16_no_scale(pSrc[iSample]), volumeFixed);
        }
    }

    return MA_SUCCESS;
}

static ma_result ma_mix_pcm_frames_s16(ma_int32* pDst, const ma_int16* pSrc, ma_uint64 frameCount, ma_uint32 channels, float volume)
{
    ma_uint64 iSample;
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL || channels == 0) {
        return MA_INVALID_ARGS;
    }

    if (volume == 0) {
        return MA_SUCCESS;  /* No changes if the volume is 0. */
    }
    
    sampleCount = frameCount * channels;

    if (volume == 1) {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += pSrc[iSample];
        }
    } else {
        ma_int16 volumeFixed = ma_float_to_fixed_16(volume);
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_apply_volume_unclipped_s16(pSrc[iSample], volumeFixed);
        }
    }
    
    return MA_SUCCESS;
}

static ma_result ma_mix_pcm_frames_s24(ma_int64* pDst, const ma_uint8* pSrc, ma_uint64 frameCount, ma_uint32 channels, float volume)
{
    ma_uint64 iSample;
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL || channels == 0) {
        return MA_INVALID_ARGS;
    }

    if (volume == 0) {
        return MA_SUCCESS;  /* No changes if the volume is 0. */
    }
    
    sampleCount = frameCount * channels;

    if (volume == 1) {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_pcm_sample_s24_to_s32_no_scale(&pSrc[iSample*3]);
        }
    } else {
        ma_int16 volumeFixed = ma_float_to_fixed_16(volume);
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_apply_volume_unclipped_s24(ma_pcm_sample_s24_to_s32_no_scale(&pSrc[iSample*3]), volumeFixed);
        }
    }

    return MA_SUCCESS;
}

static ma_result ma_mix_pcm_frames_s32(ma_int64* pDst, const ma_int32* pSrc, ma_uint64 frameCount, ma_uint32 channels, float volume)
{
    ma_uint64 iSample;
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL || channels == 0) {
        return MA_INVALID_ARGS;
    }

    if (volume == 0) {
        return MA_SUCCESS;  /* No changes if the volume is 0. */
    }
    
    
    sampleCount = frameCount * channels;

    if (volume == 1) {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += pSrc[iSample];
        }
    } else {
        ma_int16 volumeFixed = ma_float_to_fixed_16(volume);
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_apply_volume_unclipped_s32(pSrc[iSample], volumeFixed);
        }
    }

    return MA_SUCCESS;
}

static ma_result ma_mix_pcm_frames_f32(float* pDst, const float* pSrc, ma_uint64 frameCount, ma_uint32 channels, float volume)
{
    ma_uint64 iSample;
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL || channels == 0) {
        return MA_INVALID_ARGS;
    }

    if (volume == 0) {
        return MA_SUCCESS;  /* No changes if the volume is 0. */
    }

    sampleCount = frameCount * channels;

    if (volume == 1) {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += pSrc[iSample];
        }
    } else {
        for (iSample = 0; iSample < sampleCount; iSample += 1) {
            pDst[iSample] += ma_apply_volume_unclipped_f32(pSrc[iSample], volume);
        }
    }

    return MA_SUCCESS;
}

static ma_result ma_mix_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels, float volume)
{
    ma_result result;

    switch (format)
    {
        case ma_format_u8:  result = ma_mix_pcm_frames_u8( (ma_int16*)pDst, (const ma_uint8*)pSrc, frameCount, channels, volume); break;
        case ma_format_s16: result = ma_mix_pcm_frames_s16((ma_int32*)pDst, (const ma_int16*)pSrc, frameCount, channels, volume); break;
        case ma_format_s24: result = ma_mix_pcm_frames_s24((ma_int64*)pDst, (const ma_uint8*)pSrc, frameCount, channels, volume); break;
        case ma_format_s32: result = ma_mix_pcm_frames_s32((ma_int64*)pDst, (const ma_int32*)pSrc, frameCount, channels, volume); break;
        case ma_format_f32: result = ma_mix_pcm_frames_f32((   float*)pDst, (const    float*)pSrc, frameCount, channels, volume); break;
        default: return MA_INVALID_ARGS;    /* Unknown format. */
    }

    return result;
}

static ma_result ma_mix_pcm_frames_ex(void* pDst, ma_format formatOut, ma_uint32 channelsOut, const void* pSrc, ma_format formatIn, ma_uint32 channelsIn, ma_uint64 frameCount, float volume)
{
    if (pDst == NULL || pSrc == NULL) {
        return MA_INVALID_ARGS;
    }

    if (formatOut == formatIn && channelsOut == channelsIn) {
        /* Fast path. */
        return ma_mix_pcm_frames(pDst, pSrc, frameCount, formatOut, channelsOut, volume);
    } else {
        /* Slow path. Data conversion required. */
        ma_uint8  buffer[MA_DATA_CONVERTER_STACK_BUFFER_SIZE];
        ma_uint32 bufferCapInFrames = sizeof(buffer) / ma_get_bytes_per_frame(formatOut, channelsOut);
        ma_uint64 totalFramesProcessed = 0;
        /* */ void* pRunningDst = pDst;
        const void* pRunningSrc = pSrc;

        while (totalFramesProcessed < frameCount) {
            ma_uint64 framesToProcess = frameCount - totalFramesProcessed;
            if (framesToProcess > bufferCapInFrames) {
                framesToProcess = bufferCapInFrames;
            }

            /* Conversion. */
            ma_convert_pcm_frames_format_and_channels(buffer, formatOut, channelsOut, pRunningSrc, formatIn, channelsIn, framesToProcess, ma_dither_mode_none);

            /* Mixing. */
            ma_mix_pcm_frames(pRunningDst, buffer, framesToProcess, formatOut, channelsOut, volume);

            totalFramesProcessed += framesToProcess;
            pRunningDst = ma_offset_ptr(pRunningDst, framesToProcess * ma_get_accumulation_bytes_per_frame(formatOut, channelsOut));
            pRunningSrc = ma_offset_ptr(pRunningSrc, framesToProcess * ma_get_bytes_per_frame(formatIn, channelsIn));
        }
    }

    return MA_SUCCESS;
}


static void ma_convert_pcm_frames_channels_and_mix_f32(float* pFramesOut, ma_uint32 channelsOut, const float* pFramesIn, ma_uint32 channelsIn, ma_uint64 frameCount, float volume)
{
    if (pFramesOut == NULL || pFramesIn == NULL) {
        return;
    }

    if (channelsOut == channelsIn) {
        /* Fast path. No channel conversion required. */
        ma_mix_pcm_frames_f32(pFramesOut, pFramesIn, frameCount, channelsIn, volume);
    } else {
        /* Slow path. Channel conversion required. Needs to be done in two steps with an intermediary buffer. */
        float temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE / sizeof(float)];    /* In output channels. */
        ma_uint64 tempCapInFrames = ma_countof(temp) / channelsOut;
        ma_uint64 totalFramesProcessed = 0;
    
        while (totalFramesProcessed < frameCount) {
            ma_uint64 framesToProcess;

            framesToProcess = frameCount - totalFramesProcessed;
            if (framesToProcess > tempCapInFrames) {
                framesToProcess = tempCapInFrames;
            }

            /* Step 1: Convert channels. */
            ma_convert_pcm_frames_channels_f32(temp, channelsOut, ma_offset_pcm_frames_const_ptr_f32(pFramesIn, totalFramesProcessed, channelsIn), channelsIn, framesToProcess);

            /* Step 2: Mix. */
            ma_mix_pcm_frames_f32(ma_offset_pcm_frames_ptr_f32(pFramesOut, totalFramesProcessed, channelsIn), temp, framesToProcess, channelsOut, volume);

            totalFramesProcessed += framesToProcess;
        }
    }
}



MA_API ma_node_graph_config ma_node_graph_config_init(ma_uint32 channels)
{
    ma_node_graph_config config;

    MA_ZERO_OBJECT(&config);
    config.channels = channels;

    return config;
}


static void ma_node_graph_set_is_reading(ma_node_graph* pNodeGraph, ma_bool8 isReading)
{
    MA_ASSERT(pNodeGraph != NULL);
    c89atomic_exchange_8(&pNodeGraph->isReading, isReading);
}

static ma_bool8 ma_node_graph_is_reading(ma_node_graph* pNodeGraph)
{
    MA_ASSERT(pNodeGraph != NULL);
    return c89atomic_load_8(&pNodeGraph->isReading);
}

static void ma_node_graph_increment_read_counter(ma_node_graph* pNodeGraph)
{
    MA_ASSERT(pNodeGraph != NULL);
    c89atomic_fetch_add_32(&pNodeGraph->readCounter, 1);
}

static ma_uint32 ma_node_graph_get_read_counter(ma_node_graph* pNodeGraph)
{
    MA_ASSERT(pNodeGraph != NULL);
    return c89atomic_load_32(&pNodeGraph->readCounter);
}


static void ma_node_graph_endpoint_process_pcm_frames(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;

    MA_ASSERT(pNodeBase != NULL);
    MA_ASSERT(ma_node_get_input_bus_count(pNodeBase)  == 1);
    MA_ASSERT(ma_node_get_output_bus_count(pNodeBase) == 1);

    /* Input channel count needs to be the same as the output channel count. */
    MA_ASSERT(ma_node_get_input_channels(pNodeBase, 0) == ma_node_get_output_channels(pNodeBase, 0));

    (void)pFrameCountIn;

    /* The data has already been mixed. We just need to move it to the output buffer. */
    ma_copy_pcm_frames(ppFramesOut[0], ppFramesIn[0], *pFrameCountOut, ma_format_f32, ma_node_get_output_channels(pNodeBase, 0));
}

static ma_node_vtable g_node_graph_endpoint_vtable =
{
    ma_node_graph_endpoint_process_pcm_frames,
    1,  /* 1 input bus. */
    1,  /* 1 output bus. */
    0   /* Default flags. */
};

MA_API ma_result ma_node_graph_init(const ma_node_graph_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_node_graph* pNodeGraph)
{
    ma_result result;
    ma_node_config endpointConfig;

    if (pNodeGraph == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pNodeGraph);

    endpointConfig = ma_node_config_init(&g_node_graph_endpoint_vtable, pConfig->channels, pConfig->channels);

    result = ma_node_init(pNodeGraph, &endpointConfig, pAllocationCallbacks, &pNodeGraph->endpoint);
    if (result != MA_SUCCESS) {
        return result;
    }

    return MA_SUCCESS;
}

MA_API void ma_node_graph_uninit(ma_node_graph* pNodeGraph, const ma_allocation_callbacks* pAllocationCallbacks)
{
    if (pNodeGraph == NULL) {
        return;
    }

    ma_node_uninit(&pNodeGraph->endpoint, pAllocationCallbacks);
}

MA_API ma_node* ma_node_graph_get_endpoint(ma_node_graph* pNodeGraph)
{
    if (pNodeGraph == NULL) {
        return NULL;
    }

    return &pNodeGraph->endpoint;
}

MA_API ma_result ma_node_graph_read_pcm_frames(ma_node_graph* pNodeGraph, void* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead)
{
    ma_result result = MA_SUCCESS;
    ma_uint32 totalFramesRead;
    ma_uint32 channels;

    if (pFramesRead != NULL) {
        *pFramesRead = 0;   /* Safety. */
    }

    if (pNodeGraph == NULL) {
        return MA_INVALID_ARGS;
    }

    channels = ma_node_get_output_channels(&pNodeGraph->endpoint, 0);

    
    /* We'll be nice and try to do a full read of all frameCount frames. */
    totalFramesRead = 0;
    while (totalFramesRead < frameCount) {
        ma_uint32 framesJustRead;
        ma_uint32 framesToRead = frameCount - totalFramesRead;
        
        ma_node_graph_set_is_reading(pNodeGraph, MA_TRUE);
        {
            result = ma_node_read_pcm_frames(&pNodeGraph->endpoint, 0, (float*)ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, ma_format_f32, channels), framesToRead, &framesJustRead, ma_node_get_time(&pNodeGraph->endpoint));
        }
        ma_node_graph_set_is_reading(pNodeGraph, MA_FALSE);
        ma_node_graph_increment_read_counter(pNodeGraph);

        totalFramesRead += framesJustRead;

        if (result != MA_SUCCESS) {
            break;
        }
    }

    /* Let's go ahead and silence any leftover frames just for some added safety to ensure the caller doesn't try emitting garbage out of the speakers. */
    if (totalFramesRead < frameCount) {
        ma_silence_pcm_frames(ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, ma_format_f32, channels), (frameCount - totalFramesRead), ma_format_f32, channels);
    }

    if (pFramesRead != NULL) {
        *pFramesRead = totalFramesRead;
    }

    return result;
}

MA_API ma_uint32 ma_node_graph_get_channels(const ma_node_graph* pNodeGraph)
{
    if (pNodeGraph == NULL) {
        return 0;
    }

    return ma_node_get_output_channels(&pNodeGraph->endpoint, 0);
}

MA_API ma_uint64 ma_node_graph_get_time(const ma_node_graph* pNodeGraph)
{
    if (pNodeGraph == NULL) {
        return 0;
    }

    return ma_node_get_time(&pNodeGraph->endpoint); /* Global time is just the local time of the endpoint. */
}

MA_API ma_result ma_node_graph_set_time(ma_node_graph* pNodeGraph, ma_uint64 globalTime)
{
    if (pNodeGraph == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_node_set_time(&pNodeGraph->endpoint, globalTime); /* Global time is just the local time of the endpoint. */
}



static ma_result ma_node_output_bus_init(ma_node* pNode, ma_uint32 outputBusIndex, ma_uint32 channels, ma_node_output_bus* pOutputBus)
{
    MA_ASSERT(pOutputBus != NULL);
    MA_ASSERT(outputBusIndex < MA_MAX_NODE_BUS_COUNT);
    MA_ASSERT(outputBusIndex < ma_node_get_output_bus_count(pNode));
    MA_ASSERT(channels < 256);

    MA_ZERO_OBJECT(pOutputBus);

    pOutputBus->pNode          = pNode;
    pOutputBus->outputBusIndex = (ma_uint8)outputBusIndex;
    pOutputBus->channels       = (ma_uint8)channels;
    pOutputBus->flags          = MA_NODE_OUTPUT_BUS_FLAG_HAS_READ; /* <-- Important that this flag is set by default. */
    pOutputBus->volume         = 1;

    return MA_SUCCESS;
}

static void ma_node_output_bus_lock(ma_node_output_bus* pOutputBus)
{
    ma_spinlock_lock(&pOutputBus->lock);
}

static void ma_node_output_bus_unlock(ma_node_output_bus* pOutputBus)
{
    ma_spinlock_unlock(&pOutputBus->lock);
}


static ma_uint32 ma_node_output_bus_get_channels(const ma_node_output_bus* pOutputBus)
{
    return pOutputBus->channels;
}


static void ma_node_output_bus_set_has_read(ma_node_output_bus* pOutputBus, ma_bool32 hasRead)
{
    if (hasRead) {
        c89atomic_fetch_or_8(&pOutputBus->flags, MA_NODE_OUTPUT_BUS_FLAG_HAS_READ);
    } else {
        c89atomic_fetch_and_8(&pOutputBus->flags, (ma_uint8)~MA_NODE_OUTPUT_BUS_FLAG_HAS_READ);
    }
}

static ma_bool32 ma_node_output_bus_has_read(ma_node_output_bus* pOutputBus)
{
    return (c89atomic_load_8(&pOutputBus->flags) & MA_NODE_OUTPUT_BUS_FLAG_HAS_READ) != 0;
}


static void ma_node_output_bus_set_is_attached(ma_node_output_bus* pOutputBus, ma_bool8 isAttached)
{
    c89atomic_exchange_8(&pOutputBus->isAttached, isAttached);
}

static ma_bool8 ma_node_output_bus_is_attached(ma_node_output_bus* pOutputBus)
{
    return c89atomic_load_8(&pOutputBus->isAttached);
}


static ma_result ma_node_output_bus_set_volume(ma_node_output_bus* pOutputBus, float volume)
{
    MA_ASSERT(pOutputBus != NULL);

    if (volume < 0.0f) {
        volume = 0.0f;
    }

    c89atomic_exchange_f32(&pOutputBus->volume, volume);

    return MA_SUCCESS;
}

static float ma_node_output_bus_get_volume(const ma_node_output_bus* pOutputBus)
{
    return c89atomic_load_f32((float*)&pOutputBus->volume);
}

static ma_uint32 ma_node_output_bus_set_read_counter(ma_node_output_bus* pOutputBus, ma_uint32 newReadCounter)
{
    ma_uint32 oldReadCounter;

    MA_ASSERT(pOutputBus != NULL);

    /*
    This function will only ever be called in a controlled environment (only on the audio thread,
    and never concurrently).
    */
    oldReadCounter = pOutputBus->readCounter;
    pOutputBus->readCounter = newReadCounter;

    return oldReadCounter;
}



static ma_result ma_node_input_bus_init(ma_uint32 channels, ma_node_input_bus* pInputBus)
{
    MA_ASSERT(pInputBus != NULL);
    MA_ASSERT(channels < 256);

    MA_ZERO_OBJECT(pInputBus);
    pInputBus->channels = (ma_uint8)channels;

    return MA_SUCCESS;
}

static void ma_node_input_bus_lock(ma_node_input_bus* pInputBus)
{
    ma_spinlock_lock(&pInputBus->lock);
}

static void ma_node_input_bus_unlock(ma_node_input_bus* pInputBus)
{
    ma_spinlock_unlock(&pInputBus->lock);
}


static void ma_node_input_bus_next_begin(ma_node_input_bus* pInputBus)
{
    c89atomic_fetch_add_16(&pInputBus->nextCounter, 1);
}

static void ma_node_input_bus_next_end(ma_node_input_bus* pInputBus)
{
    c89atomic_fetch_sub_16(&pInputBus->nextCounter, 1);
}

static ma_uint16 ma_node_input_bus_get_next_counter(ma_node_input_bus* pInputBus)
{
    return c89atomic_load_16(&pInputBus->nextCounter);
}


static ma_uint32 ma_node_input_bus_get_channels(const ma_node_input_bus* pInputBus)
{
    return pInputBus->channels;
}


static void ma_node_input_bus_detach__no_output_bus_lock(ma_node_input_bus* pInputBus, ma_node_output_bus* pOutputBus)
{
    MA_ASSERT(pInputBus  != NULL);
    MA_ASSERT(pOutputBus != NULL);

    /*
    Mark the output bus as detached first. This will prevent future iterations on the audio thread
    from iterating this output bus.
    */
    ma_node_output_bus_set_is_attached(pOutputBus, MA_FALSE);

    /*
    We cannot use the output bus lock here since it'll be getting used at a higher level, but we do
    still need to use the input bus lock since we'll be updating pointers on two different output
    buses. The same rules apply here as the attaching case. Although we're using a lock here, we're
    *not* using a lock when iterating over the list in the audio thread. We therefore need to craft
    this in a way such that the iteration on the audio thread doesn't break.

    The the first thing to do is swap out the "next" pointer of the previous output bus with the
    new "next" output bus. This is the operation that matters for iteration on the audio thread.
    After that, the previous pointer on the new "next" pointer needs to be updated, after which
    point the linked list will be in a good state.
    */
    ma_node_input_bus_lock(pInputBus);
    {
        ma_node_output_bus* pOldPrev = (ma_node_output_bus*)c89atomic_load_ptr(&pOutputBus->pPrev);
        ma_node_output_bus* pOldNext = (ma_node_output_bus*)c89atomic_load_ptr(&pOutputBus->pNext);

        if (pOldPrev != NULL) {
            c89atomic_exchange_ptr(&pOldPrev->pNext, pOldNext); /* <-- This is where the output bus is detached from the list. */
        }
        if (pOldNext != NULL) {
            c89atomic_exchange_ptr(&pOldNext->pPrev, pOldPrev); /* <-- This is required for detachment. */
        }
    }
    ma_node_input_bus_unlock(pInputBus);

    /* At this point the output bus is detached and the linked list is completely unaware of it. Reset some data for safety. */
    c89atomic_exchange_ptr(&pOutputBus->pNext, NULL);   /* Using atomic exchanges here, mainly for the benefit of analysis tools which don't always recognize spinlocks. */
    c89atomic_exchange_ptr(&pOutputBus->pPrev, NULL);   /* As above. */
    pOutputBus->pInputNode             = NULL;
    pOutputBus->inputNodeInputBusIndex = 0;


    /*
    For thread-safety reasons, we don't want to be returning from this straight away. We need to
    wait for the audio thread to finish with the output bus. There's two things we need to wait
    for. The first is the part that selects the next output bus in the list, and the other is the
    part that reads from the output bus. Basically all we're doing is waiting for the input bus
    to stop referencing the output bus.

    We're doing this part last because we want the section above to run while the audio thread
    is finishing up with the output bus, just for efficiency reasons. We marked the output bus as
    detached right at the top of this function which is going to prevent the audio thread from
    iterating the output bus again.
    */

    /* Part 1: Wait for the current iteration to complete. */
    while (ma_node_input_bus_get_next_counter(pInputBus) > 0) {
        ma_yield();
    }

    /* Part 2: Wait for any reads to complete. */
    while (c89atomic_load_16(&pOutputBus->refCount) > 0) {
        ma_yield();
    }

    /*
    At this point we're done detaching and we can be guaranteed that the audio thread is not going
    to attempt to reference this output bus again (until attached again).
    */
}

#if 0   /* Not used at the moment, but leaving here in case I need it later. */
static void ma_node_input_bus_detach(ma_node_input_bus* pInputBus, ma_node_output_bus* pOutputBus)
{
    MA_ASSERT(pInputBus  != NULL);
    MA_ASSERT(pOutputBus != NULL);

    ma_node_output_bus_lock(pOutputBus);
    {
        ma_node_input_bus_detach__no_output_bus_lock(pInputBus, pOutputBus);
    }
    ma_node_output_bus_unlock(pOutputBus);
}
#endif

static void ma_node_input_bus_attach(ma_node_input_bus* pInputBus, ma_node_output_bus* pOutputBus, ma_node* pNewInputNode, ma_uint32 inputNodeInputBusIndex)
{
    MA_ASSERT(pInputBus  != NULL);
    MA_ASSERT(pOutputBus != NULL);

    ma_node_output_bus_lock(pOutputBus);
    {
        ma_node_output_bus* pOldInputNode = (ma_node_output_bus*)c89atomic_load_ptr(&pOutputBus->pInputNode);

        /* Detach from any existing attachment first if necessary. */
        if (pOldInputNode != NULL) {
            ma_node_input_bus_detach__no_output_bus_lock(pInputBus, pOutputBus);
        }

        /*
        At this point we can be sure the output bus is not attached to anything. The linked list in the
        old input bus has been updated so that pOutputBus will not get iterated again.
        */
        pOutputBus->pInputNode             = pNewInputNode;                     /* No need for an atomic assignment here because modification of this variable always happens within a lock. */
        pOutputBus->inputNodeInputBusIndex = (ma_uint8)inputNodeInputBusIndex;  /* As above. */

        /*
        Now we need to attach the output bus to the linked list. This involves updating two pointers on
        two different output buses so I'm going to go ahead and keep this simple and just use a lock.
        There are ways to do this without a lock, but it's just too hard to maintain for it's value.

        Although we're locking here, it's important to remember that we're *not* locking when iterating
        and reading audio data since that'll be running on the audio thread. As a result we need to be
        careful how we craft this so that we don't break iteration. What we're going to do is always
        attach the new item so that it becomes the first item in the list. That way, as we're iterating
        we won't break any links in the list and iteration will continue safely. The detaching case will
        also be crafted in a way as to not break list iteration. It's important to remember to use
        atomic exchanges here since no locking is happening on the audio thread during iteration.
        */
        ma_node_input_bus_lock(pInputBus);
        {
            ma_node_output_bus* pNewPrev = &pInputBus->head;
            ma_node_output_bus* pNewNext = (ma_node_output_bus*)c89atomic_load_ptr(&pInputBus->head.pNext);

            /* Update the local output bus. */
            c89atomic_exchange_ptr(&pOutputBus->pPrev, pNewPrev);
            c89atomic_exchange_ptr(&pOutputBus->pNext, pNewNext);

            /* Update the other output buses to point back to the local output bus. */
            c89atomic_exchange_ptr(&pInputBus->head.pNext, pOutputBus); /* <-- This is where the output bus is actually attached to the input bus. */

            /* Do the previous pointer last. This is only used for detachment. */
            if (pNewNext != NULL) {
                c89atomic_exchange_ptr(&pNewNext->pPrev,  pOutputBus);
            }
        }
        ma_node_input_bus_unlock(pInputBus);

        /*
        Mark the node as attached last. This is used to controlling whether or the output bus will be
        iterated on the audio thread. Mainly required for detachment purposes.
        */
        ma_node_output_bus_set_is_attached(pOutputBus, MA_TRUE);
    }
    ma_node_output_bus_unlock(pOutputBus);
}

static ma_node_output_bus* ma_node_input_bus_next(ma_node_input_bus* pInputBus, ma_node_output_bus* pOutputBus)
{
    ma_node_output_bus* pNext;

    MA_ASSERT(pInputBus != NULL);

    if (pOutputBus == NULL) {
        return NULL;
    }

    ma_node_input_bus_next_begin(pInputBus);
    {
        pNext = pOutputBus;
        for (;;) {
            pNext = (ma_node_output_bus*)c89atomic_load_ptr(&pNext->pNext);
            if (pNext == NULL) {
                break;      /* Reached the end. */
            }

            if (ma_node_output_bus_is_attached(pNext) == MA_FALSE) {
                continue;   /* The node is not attached. Keep checking. */
            }

            /* The next node has been selected. */
            break;
        }

        /* We need to increment the reference count of the selected node. */
        if (pNext != NULL) {
            c89atomic_fetch_add_16(&pNext->refCount, 1);
        }
        
        /* The previous node is no longer being referenced. */
        c89atomic_fetch_sub_16(&pOutputBus->refCount, 1);
    }
    ma_node_input_bus_next_end(pInputBus);

    return pNext;
}

static ma_node_output_bus* ma_node_input_bus_first(ma_node_input_bus* pInputBus)
{
    return ma_node_input_bus_next(pInputBus, &pInputBus->head);
}



static ma_result ma_node_input_bus_read_pcm_frames(ma_node* pInputNode, ma_node_input_bus* pInputBus, float* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead, ma_uint64 globalTime)
{
    ma_result result = MA_SUCCESS;
    ma_node_output_bus* pOutputBus;
    ma_node_output_bus* pFirst;
    ma_uint32 inputChannels;

    /*
    This will be called from the audio thread which means we can't be doing any locking. Basically,
    this function will not perfom any locking, whereas attaching and detaching will, but crafted in
    such a way that we don't need to perform any locking here. The important thing to remember is
    to always iterate in a forward direction.

    In order to process any data we need to first read from all input buses. That's where this
    function comes in. This iterates over each of the attachments and accumulates/mixes them. We
    also convert the channels to the nodes output channel count before mixing. We want to do this
    channel conversion so that the caller of this function can invoke the processing callback
    without having to do it themselves.

    When we iterate over each of the attachments on the input bus, we need to read as much data as
    we can from each of them so that we don't end up with holes between each of the attachments. To
    do this, we need to read from each attachment in a loop and read as many frames as we can, up
    to `frameCount`.
    */
    MA_ASSERT(pInputNode  != NULL);
    MA_ASSERT(pFramesRead != NULL); /* pFramesRead is critical and must always be specified. On input it's undefined and on output it'll be set to the number of frames actually read. */

    *pFramesRead = 0;   /* Safety. */

    inputChannels = ma_node_input_bus_get_channels(pInputBus);

    /*
    We need to be careful with how we call ma_node_input_bus_first() and ma_node_input_bus_next(). They
    are both critical to our lock-free thread-safety system. We can only call ma_node_input_bus_first()
    once per iteration, however we have an optimization to checks whether or not it's the first item in
    the list. We therefore need to store a pointer to the first item rather than repeatedly calling
    ma_node_input_bus_first(). It's safe to keep hold of this point, so long as we don't dereference it
    after calling ma_node_input_bus_next(), which we won't be.
    */
    pFirst = ma_node_input_bus_first(pInputBus);
    if (pFirst == NULL) {
        return MA_SUCCESS;  /* No attachments. Read nothing. */
    }

    for (pOutputBus = pFirst; pOutputBus != NULL; pOutputBus = ma_node_input_bus_next(pInputBus, pOutputBus)) {
        ma_uint32 framesProcessed = 0;
        ma_uint32 readCounter;

        MA_ASSERT(pOutputBus->pNode != NULL);

        /*
        We need to grab the read counter at the start so we can set a new read counter first up. We
        need to do this first so that recursive reads can have access to the new counter. Note that
        we need to do this here and *not* in ma_node_read_pcm_frames() which would be the more
        intuitive option because we need to loop here in order to fill up as many frames as we can
        which would cause all iterations after the first to return 0 frames because of the loop
        detection logic getting triggered.
        */
        readCounter = ma_node_output_bus_set_read_counter(pOutputBus, ma_node_graph_get_read_counter(ma_node_get_node_graph(pOutputBus->pNode)) + 1);

        /*
        If the node's read counter is larger than that of the graph it means we've hit a loop and
        we need to skip this attachment.
        */
        if (readCounter > ma_node_graph_get_read_counter(ma_node_get_node_graph(pOutputBus->pNode))) {
            continue;   /* This output bus has already been processed by the current iteration. */
        }

        if (pFramesOut != NULL) {
            /* Read. */
            float temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE / sizeof(float)];
            ma_uint32 tempCapInFrames = ma_countof(temp) / inputChannels;
            float volume = ma_node_output_bus_get_volume(pOutputBus);
                    
            while (framesProcessed < frameCount) {
                float* pRunningFramesOut;
                ma_uint32 framesToRead;
                ma_uint32 framesJustRead;

                framesToRead = frameCount - framesProcessed;
                if (framesToRead > tempCapInFrames) {
                    framesToRead = tempCapInFrames;
                }

                pRunningFramesOut = ma_offset_pcm_frames_ptr_f32(pFramesOut, framesProcessed, inputChannels);

                if (pOutputBus == pFirst) {
                    /* Fast path. First attachment. We just read straight into the output buffer (no mixing required). */
                    result = ma_node_read_pcm_frames(pOutputBus->pNode, pOutputBus->outputBusIndex, pRunningFramesOut, framesToRead, &framesJustRead, globalTime + framesProcessed);
                    if (result == MA_SUCCESS || result == MA_AT_END) {
                        /* Apply volume, if necessary. */
                        if (volume != 1) {
                            ma_apply_volume_factor_f32(pRunningFramesOut, framesJustRead * inputChannels, volume);
                        }
                    }
                } else {
                    /* Slow path. Not the first attachment. Mixing required. */
                    result = ma_node_read_pcm_frames(pOutputBus->pNode, pOutputBus->outputBusIndex, temp, framesToRead, &framesJustRead, globalTime + framesProcessed);
                    if (result == MA_SUCCESS || result == MA_AT_END) {
                        /* Apply volume, if necessary. */
                        if (volume != 1) {
                            ma_apply_volume_factor_f32(temp, framesJustRead * inputChannels, volume);
                        }

                        ma_mix_pcm_frames_f32(pRunningFramesOut, temp, framesJustRead, inputChannels, /*volume*/1);
                    }
                }

                framesProcessed += framesJustRead;

                /* If we reached the end or otherwise failed to read any data we need to finish up with this output node. */
                if (result != MA_SUCCESS) {
                    break;
                }

                /* If we didn't read anything, abort so we don't get stuck in a loop. */
                if (framesJustRead == 0) {
                    break;
                }
            }

            /* If it's the first attachment we didn't do any mixing. Any leftover samples need to be silenced. */
            if (pOutputBus == pFirst && framesProcessed < frameCount) {
                ma_silence_pcm_frames(ma_offset_pcm_frames_ptr(pFramesOut, framesProcessed, ma_format_f32, inputChannels), (frameCount - framesProcessed), ma_format_f32, inputChannels);
            }
        } else {
            /* Seek. */
            ma_node_read_pcm_frames(pOutputBus->pNode, pOutputBus->outputBusIndex, NULL, frameCount, &framesProcessed, globalTime);
        }
    }

    /* In this path we always "process" the entire amount. */
    *pFramesRead = frameCount;

    return result;
}


MA_API ma_node_config ma_node_config_init(ma_node_vtable* vtable, ma_uint32 inputChannels, ma_uint32 outputChannels)
{
    ma_node_config config;
    ma_uint32 iInputBus;
    ma_uint32 iOutputBus;

    MA_ZERO_OBJECT(&config);
    config.vtable = vtable;
    config.initialState = ma_node_state_started;    /* Nodes are started by default. */

    for (iInputBus = 0; iInputBus < MA_MAX_NODE_BUS_COUNT; iInputBus += 1) {
        config.inputChannels[iInputBus] = inputChannels;
    }

    for (iOutputBus = 0; iOutputBus < MA_MAX_NODE_BUS_COUNT; iOutputBus += 1) {
        config.outputChannels[iOutputBus] = outputChannels;
    }

    return config;
}



static ma_result ma_node_detach_full(ma_node* pNode);

static float* ma_node_get_cached_input_ptr(ma_node* pNode, ma_uint32 inputBusIndex)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_uint32 iInputBus;
    float* pBasePtr;

    MA_ASSERT(pNodeBase != NULL);

    /* Input data is stored at the front of the buffer. */
    pBasePtr = pNodeBase->pCachedData;
    for (iInputBus = 0; iInputBus < inputBusIndex; iInputBus += 1) {
        pBasePtr += pNodeBase->cachedDataCapInFramesPerBus * ma_node_input_bus_get_channels(&pNodeBase->inputBuses[iInputBus]);
    }

    return pBasePtr;
}

static float* ma_node_get_cached_output_ptr(ma_node* pNode, ma_uint32 outputBusIndex)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_uint32 iInputBus;
    ma_uint32 iOutputBus;
    float* pBasePtr;

    MA_ASSERT(pNodeBase != NULL);

    /* Cached output data starts after the input data. */
    pBasePtr = pNodeBase->pCachedData;
    for (iInputBus = 0; iInputBus < ma_node_get_input_bus_count(pNodeBase); iInputBus += 1) {
        pBasePtr += pNodeBase->cachedDataCapInFramesPerBus * ma_node_input_bus_get_channels(&pNodeBase->inputBuses[iInputBus]);
    }

    for (iOutputBus = 0; iOutputBus < outputBusIndex; iOutputBus += 1) {
        pBasePtr += pNodeBase->cachedDataCapInFramesPerBus * ma_node_output_bus_get_channels(&pNodeBase->outputBuses[iOutputBus]);
    }
    
    return pBasePtr;
}


MA_API ma_result ma_node_init(ma_node_graph* pNodeGraph, const ma_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_node* pNode)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_uint32 iInputBus;
    ma_uint32 iOutputBus;

    if (pNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pNodeBase);

    if (pConfig == NULL || pConfig->vtable == NULL || pConfig->vtable->onProcess == NULL) {
        return MA_INVALID_ARGS; /* Config is invalid. */
    }

    if (pConfig->vtable->inputBusCount > MA_MAX_NODE_BUS_COUNT || pConfig->vtable->outputBusCount > MA_MAX_NODE_BUS_COUNT) {
        return MA_INVALID_ARGS; /* Invalid bus count. */
    }

    pNodeBase->pNodeGraph = pNodeGraph;
    pNodeBase->vtable     = pConfig->vtable;
    pNodeBase->state      = pConfig->initialState;
    pNodeBase->stateTimes[ma_node_state_started] = 0;
    pNodeBase->stateTimes[ma_node_state_stopped] = (ma_uint64)(ma_int64)-1; /* Weird casting for VC6 compatibility. */

    /* We need to run an initialization step for each input bus. */ 
    for (iInputBus = 0; iInputBus < ma_node_get_input_bus_count(pNodeBase); iInputBus += 1) {
        if (pConfig->inputChannels[iInputBus] < MA_MIN_CHANNELS || pConfig->inputChannels[iInputBus] > MA_MAX_CHANNELS) {
            return MA_INVALID_ARGS; /* Invalid channel count. */
        }

        ma_node_input_bus_init(pConfig->inputChannels[iInputBus], &pNodeBase->inputBuses[iInputBus]);
    }

    /*
    The read flag on all output buses needs to default to 1. This ensures fresh input data is read
    on the first call to ma_node_read_pcm_frames(). Not doing this will result in the first call
    having garbage data returned.
    */
    for (iOutputBus = 0; iOutputBus < ma_node_get_output_bus_count(pNodeBase); iOutputBus += 1) {
        if (pConfig->outputChannels[iOutputBus] < MA_MIN_CHANNELS || pConfig->outputChannels[iOutputBus] > MA_MAX_CHANNELS) {
            return MA_INVALID_ARGS; /* Invalid channel count. */
        }

        ma_node_output_bus_init(pNodeBase, iOutputBus, pConfig->outputChannels[iOutputBus], &pNodeBase->outputBuses[iOutputBus]);
    }


    /*
    We need to allocate memory for a caching both input and output data. We have an optimization
    where no caching is necessary for specific conditions:

        - The node has 0 inputs and 1 output.

    When a node meets the above conditions, no cache is allocated.

    The size choice for this buffer is a little bit finicky. We don't want to be too wasteful by
    allocating too much, but at the same time we want it be large enough so that enough frames can
    be processed for each call to ma_node_read_pcm_frames() so that it keeps things efficient. For
    now I'm going with 10ms @ 48K which is 480 frames per bus. This is configurable at compile
    time. It might also be worth investigating whether or not this can be configured at run time.
    */
    if (ma_node_get_input_bus_count(pNode) == 0 && ma_node_get_output_bus_count(pNode) == 1) {
        /* Fast path. No cache needed. */
    } else {
        /* Slow path. Cache needed. */
        size_t cachedDataSizeInBytes = 0;
        ma_uint32 iBus;

        pNodeBase->cachedDataCapInFramesPerBus = MA_DEFAULT_NODE_CACHE_CAP_IN_FRAMES_PER_BUS;
        MA_ASSERT(pNodeBase->cachedDataCapInFramesPerBus <= 0xFFFF);    /* Clamped to 16 bits. */

        for (iBus = 0; iBus < ma_node_get_input_bus_count(pNodeBase); iBus += 1) {
            cachedDataSizeInBytes += pNodeBase->cachedDataCapInFramesPerBus * ma_get_bytes_per_frame(ma_format_f32, ma_node_get_input_channels(pNodeBase, iBus));
        }

        for (iBus = 0; iBus < ma_node_get_output_bus_count(pNodeBase); iBus += 1) {
            cachedDataSizeInBytes += pNodeBase->cachedDataCapInFramesPerBus * ma_get_bytes_per_frame(ma_format_f32, ma_node_get_output_channels(pNodeBase, iBus));
        }

        pNodeBase->pCachedData = (float*)ma_malloc(cachedDataSizeInBytes, pAllocationCallbacks);
        if (pNodeBase->pCachedData == NULL) {
            return MA_OUT_OF_MEMORY;
        }

    #if 1   /* Toggle this between 0 and 1 to turn debugging on or off. 1 = fill with a sine wave for debugging; 0 = fill with silence. */
        /* For safety we'll go ahead and default the buffer to silence. */
        for (iBus = 0; iBus < ma_node_get_input_bus_count(pNodeBase); iBus += 1) {
            ma_silence_pcm_frames(ma_node_get_cached_input_ptr(pNode, iBus), pNodeBase->cachedDataCapInFramesPerBus, ma_format_f32, ma_node_input_bus_get_channels(&pNodeBase->inputBuses[iBus]));
        }
        for (iBus = 0; iBus < ma_node_get_output_bus_count(pNodeBase); iBus += 1) {
            ma_silence_pcm_frames(ma_node_get_cached_output_ptr(pNode, iBus), pNodeBase->cachedDataCapInFramesPerBus, ma_format_f32, ma_node_output_bus_get_channels(&pNodeBase->outputBuses[iBus]));
        }
    #else
        /* For debugging. Default to a sine wave. */
        for (iBus = 0; iBus < ma_node_get_input_bus_count(pNodeBase); iBus += 1) {
            ma_debug_fill_pcm_frames_with_sine_wave(ma_node_get_cached_input_ptr(pNode, iBus), pNodeBase->cachedDataCapInFramesPerBus, ma_format_f32, ma_node_input_bus_get_channels(&pNodeBase->inputBuses[iBus]), 48000);
        }
        for (iBus = 0; iBus < ma_node_get_output_bus_count(pNodeBase); iBus += 1) {
            ma_debug_fill_pcm_frames_with_sine_wave(ma_node_get_cached_output_ptr(pNode, iBus), pNodeBase->cachedDataCapInFramesPerBus, ma_format_f32, ma_node_output_bus_get_channels(&pNodeBase->outputBuses[iBus]), 48000);
        }
    #endif
    }
    

    return MA_SUCCESS;
}

MA_API void ma_node_uninit(ma_node* pNode, const ma_allocation_callbacks* pAllocationCallbacks)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;

    if (pNodeBase == NULL) {
        return;
    }

    /*
    The first thing we need to do is fully detach the node. This will detach all inputs and
    outputs. We need to do this first because it will sever the connection with the node graph and
    allow us to complete uninitialization without needing to worry about thread-safety with the
    audio thread. The detachment process will wait for any local processing of the node to finish.
    */
    ma_node_detach_full(pNode);

    /*
    At this point the node should be completely unreferenced by the node graph and we can finish up
    the uninitialization process without needing to worry about thread-safety.
    */
    if (pNodeBase->pCachedData != NULL) {
        ma_free(pNodeBase->pCachedData, pAllocationCallbacks);
        pNodeBase->pCachedData = NULL;
    }
}

MA_API ma_node_graph* ma_node_get_node_graph(const ma_node* pNode)
{
    if (pNode == NULL) {
        return NULL;
    }

    return ((const ma_node_base*)pNode)->pNodeGraph;
}

MA_API ma_uint32 ma_node_get_input_bus_count(const ma_node* pNode)
{
    if (pNode == NULL) {
        return 0;
    }

    return ((ma_node_base*)pNode)->vtable->inputBusCount;
}

MA_API ma_uint32 ma_node_get_output_bus_count(const ma_node* pNode)
{
    if (pNode == NULL) {
        return 0;
    }

    return ((ma_node_base*)pNode)->vtable->outputBusCount;
}


MA_API ma_uint32 ma_node_get_input_channels(const ma_node* pNode, ma_uint32 inputBusIndex)
{
    const ma_node_base* pNodeBase = (const ma_node_base*)pNode;

    if (pNode == NULL) {
        return 0;
    }

    if (inputBusIndex >= ma_node_get_input_bus_count(pNode)) {
        return 0;   /* Invalid bus index. */
    }
    
    return ma_node_input_bus_get_channels(&pNodeBase->inputBuses[inputBusIndex]);
}

MA_API ma_uint32 ma_node_get_output_channels(const ma_node* pNode, ma_uint32 outputBusIndex)
{
    const ma_node_base* pNodeBase = (const ma_node_base*)pNode;

    if (pNode == NULL) {
        return 0;
    }
    
    if (outputBusIndex >= ma_node_get_output_bus_count(pNode)) {
        return 0;   /* Invalid bus index. */
    }

    return ma_node_output_bus_get_channels(&pNodeBase->outputBuses[outputBusIndex]);
}


static ma_result ma_node_detach_full(ma_node* pNode)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_uint32 iInputBus;

    if (pNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    /*
    Make sure the node is completely detached first. This will not return until the output bus is
    guaranteed to no longer be referenced by the audio thread.
    */
    ma_node_detach_all_output_buses(pNode);

    /*
    At this point all output buses will have been detached from the graph and we can be guaranteed
    that none of it's input nodes will be getting processed by the graph. We can detach these
    without needing to worry about the audio thread touching them.
    */
    for (iInputBus = 0; iInputBus < ma_node_get_input_bus_count(pNode); iInputBus += 1) {
        ma_node_input_bus* pInputBus;
        ma_node_output_bus* pOutputBus;

        pInputBus = &pNodeBase->inputBuses[iInputBus];

        /*
        This is important. We cannot be using ma_node_input_bus_first() or ma_node_input_bus_next(). Those
        functions are specifically for the audio thread. We'll instead just manually iterate using standard
        linked list logic. We don't need to worry about the audio thread referencing these because the step
        above severed the connection to the graph.
        */
        for (pOutputBus = (ma_node_output_bus*)c89atomic_load_ptr(&pInputBus->head.pNext); pOutputBus != NULL; pOutputBus = (ma_node_output_bus*)c89atomic_load_ptr(&pOutputBus->pNext)) {
            ma_node_detach_output_bus(pOutputBus->pNode, pOutputBus->outputBusIndex);   /* This won't do any waiting in practice and should be efficient. */
        }
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_node_detach_output_bus(ma_node* pNode, ma_uint32 outputBusIndex)
{
    ma_result result = MA_SUCCESS;
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_node_base* pInputNodeBase;

    if (pNode == NULL) {
        return MA_INVALID_ARGS;
    }

    if (outputBusIndex >= ma_node_get_output_bus_count(pNode)) {
        return MA_INVALID_ARGS; /* Invalid output bus index. */
    }

    /* We need to lock the output bus because we need to inspect the input node and grab it's input bus. */
    ma_node_output_bus_lock(&pNodeBase->outputBuses[outputBusIndex]);
    {
        pInputNodeBase = (ma_node_base*)pNodeBase->outputBuses[outputBusIndex].pInputNode;
        if (pInputNodeBase != NULL) {
            ma_node_input_bus_detach__no_output_bus_lock(&pInputNodeBase->inputBuses[pNodeBase->outputBuses[outputBusIndex].inputNodeInputBusIndex], &pNodeBase->outputBuses[outputBusIndex]);
        }
    }
    ma_node_output_bus_unlock(&pNodeBase->outputBuses[outputBusIndex]);

    return result;
}

MA_API ma_result ma_node_detach_all_output_buses(ma_node* pNode)
{
    ma_uint32 iOutputBus;

    if (pNode == NULL) {
        return MA_INVALID_ARGS;
    }

    for (iOutputBus = 0; iOutputBus < ma_node_get_output_bus_count(pNode); iOutputBus += 1) {
        ma_node_detach_output_bus(pNode, iOutputBus);
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_node_attach_output_bus(ma_node* pNode, ma_uint32 outputBusIndex, ma_node* pOtherNode, ma_uint32 otherNodeInputBusIndex)
{
    ma_node_base* pNodeBase  = (ma_node_base*)pNode;
    ma_node_base* pOtherNodeBase = (ma_node_base*)pOtherNode;

    if (pNodeBase == NULL || pOtherNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pNodeBase == pOtherNodeBase) {
        return MA_INVALID_OPERATION;    /* Cannot attach a node to itself. */
    }

    if (outputBusIndex >= ma_node_get_output_bus_count(pNode) || otherNodeInputBusIndex >= ma_node_get_input_bus_count(pOtherNode)) {
        return MA_INVALID_OPERATION;    /* Invalid bus index. */
    }

    /* The output channel count of the output node must be the same as the input channel count of the input node. */
    if (ma_node_get_output_channels(pNode, outputBusIndex) != ma_node_get_input_channels(pOtherNode, otherNodeInputBusIndex)) {
        return MA_INVALID_OPERATION;    /* Channel count is incompatible. */
    }

    /* This will deal with detaching if the output bus is already attached to something. */
    ma_node_input_bus_attach(&pOtherNodeBase->inputBuses[otherNodeInputBusIndex], &pNodeBase->outputBuses[outputBusIndex], pOtherNode, otherNodeInputBusIndex);

    return MA_SUCCESS;
}

MA_API ma_result ma_node_set_output_bus_volume(ma_node* pNode, ma_uint32 outputBusIndex, float volume)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;

    if (pNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    if (outputBusIndex >= ma_node_get_output_bus_count(pNode)) {
        return MA_INVALID_ARGS; /* Invalid bus index. */
    }

    return ma_node_output_bus_set_volume(&pNodeBase->outputBuses[outputBusIndex], volume);
}

MA_API float ma_node_get_output_bus_volume(const ma_node* pNode, ma_uint32 outputBusIndex)
{
    const ma_node_base* pNodeBase = (const ma_node_base*)pNode;

    if (pNodeBase == NULL) {
        return 0;
    }

    if (outputBusIndex >= ma_node_get_output_bus_count(pNode)) {
        return 0;   /* Invalid bus index. */
    }

    return ma_node_output_bus_get_volume(&pNodeBase->outputBuses[outputBusIndex]);
}

MA_API ma_result ma_node_set_state(ma_node* pNode, ma_node_state state)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;

    if (pNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_i16(&pNodeBase->state, state);

    return MA_SUCCESS;
}

MA_API ma_node_state ma_node_get_state(const ma_node* pNode)
{
    const ma_node_base* pNodeBase = (const ma_node_base*)pNode;

    if (pNodeBase == NULL) {
        return ma_node_state_stopped;
    }

    return c89atomic_load_i16(&pNodeBase->state);
}

MA_API ma_result ma_node_set_state_time(ma_node* pNode, ma_node_state state, ma_uint64 globalTime)
{
    if (pNode == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Validation check for safety since we'll be using this as an index into stateTimes[]. */
    if (state != ma_node_state_started && state != ma_node_state_stopped) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_64(&((ma_node_base*)pNode)->stateTimes[state], globalTime);

    return MA_SUCCESS;
}

MA_API ma_uint64 ma_node_get_state_time(const ma_node* pNode, ma_node_state state)
{
    if (pNode == NULL) {
        return 0;
    }

    /* Validation check for safety since we'll be using this as an index into stateTimes[]. */
    if (state != ma_node_state_started && state != ma_node_state_stopped) {
        return 0;
    }

    return c89atomic_load_64(&((ma_node_base*)pNode)->stateTimes[state]);
}

MA_API ma_node_state ma_node_get_state_by_time_range(const ma_node* pNode, ma_uint64 globalTimeBeg, ma_uint64 globalTimeEnd)
{
    ma_node_state state;

    if (pNode == NULL) {
        return ma_node_state_stopped;
    }

    state = ma_node_get_state(pNode);

    /* An explicitly stopped node is always stopped. */
    if (state == ma_node_state_stopped) {
        return ma_node_state_stopped;
    }

    /*
    Getting here means the node is marked as started, but it may still not be truly started due to
    it's start time not having been reached yet. Also, the stop time may have also been reached in
    which case it'll be considered stopped.
    */
    if (ma_node_get_state_time(pNode, ma_node_state_started) >= globalTimeEnd) {
        return ma_node_state_stopped;   /* Start time has not yet been reached. */
    }

    if (ma_node_get_state_time(pNode, ma_node_state_stopped) <= globalTimeBeg) {
        return ma_node_state_stopped;   /* Stop time has been reached. */
    }

    /* Getting here means the node is marked as started and is within it's start/stop times. */
    return ma_node_state_started;
}

MA_API ma_uint64 ma_node_get_time(const ma_node* pNode)
{
    if (pNode == NULL) {
        return 0;
    }

    return c89atomic_load_64(&((ma_node_base*)pNode)->localTime);
}

MA_API ma_result ma_node_set_time(ma_node* pNode, ma_uint64 localTime)
{
    if (pNode == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_64(&((ma_node_base*)pNode)->localTime, localTime);

    return MA_SUCCESS;
}



static void ma_node_process_pcm_frames_internal(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;

    MA_ASSERT(pNode != NULL);

    if (pNodeBase->vtable->onProcess) {
        pNodeBase->vtable->onProcess(pNode, ppFramesIn, pFrameCountIn, ppFramesOut, pFrameCountOut);
    }
}

static ma_result ma_node_read_pcm_frames(ma_node* pNode, ma_uint32 outputBusIndex, float* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead, ma_uint64 globalTime)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_result result = MA_SUCCESS;
    ma_uint32 iInputBus;
    ma_uint32 iOutputBus;
    ma_uint32 inputBusCount;
    ma_uint32 outputBusCount;
    ma_uint32 totalFramesRead = 0;
    float* ppFramesIn[MA_MAX_NODE_BUS_COUNT];
    float* ppFramesOut[MA_MAX_NODE_BUS_COUNT];
    ma_uint64 globalTimeBeg;
    ma_uint64 globalTimeEnd;
    ma_uint64 startTime;
    ma_uint64 stopTime;
    ma_uint32 timeOffsetBeg;
    ma_uint32 timeOffsetEnd;

    /*
    pFramesRead is mandatory. It must be used to determine how many frames were read. It's normal and
    expected that the number of frames read may be different to that requested. Therefore, the caller
    must look at this value to correctly determine how many frames were read.
    */
    MA_ASSERT(pFramesRead != NULL); /* <-- If you've triggered this assert, you're using this function wrong. You *must* use this variable and inspect it after the call returns. */
    if (pFramesRead == NULL) {
        return MA_INVALID_ARGS;
    }

    *pFramesRead = 0;   /* Safety. */

    if (pNodeBase == NULL) {
        return MA_INVALID_ARGS;
    }

    if (outputBusIndex >= ma_node_get_output_bus_count(pNodeBase)) {
        return MA_INVALID_ARGS; /* Invalid output bus index. */
    }

    /* Don't do anything if we're in a stopped state. */
    if (ma_node_get_state_by_time_range(pNode, globalTime, globalTime + frameCount) != ma_node_state_started) {
        return MA_SUCCESS;  /* We're in a stopped state. This is not an error - we just need to not read anything. */
    }


    globalTimeBeg = globalTime;
    globalTimeEnd = globalTime + frameCount;
    startTime = ma_node_get_state_time(pNode, ma_node_state_started);
    stopTime  = ma_node_get_state_time(pNode, ma_node_state_stopped);

    /*
    At this point we know that we are inside our start/stop times. However, we may need to adjust
    our frame count and output pointer to accomodate since we could be straddling the time period
    that this function is getting called for.

    It's possible (and likely) that the start time does not line up with the output buffer. We
    therefore need to offset it by a number of frames to accomodate. The same thing applies for
    the stop time.
    */
    timeOffsetBeg = (globalTimeBeg < startTime) ? (ma_uint32)(globalTimeEnd - startTime) : 0;
    timeOffsetEnd = (globalTimeEnd > stopTime)  ? (ma_uint32)(globalTimeEnd - stopTime)  : 0;

    /* Trim based on the start offset. We need to silence the start of the buffer. */
    if (timeOffsetBeg > 0) {
        ma_silence_pcm_frames(pFramesOut, timeOffsetBeg, ma_format_f32, ma_node_get_output_channels(pNode, outputBusIndex));
        pFramesOut += timeOffsetBeg * ma_node_get_output_channels(pNode, outputBusIndex);
        frameCount -= timeOffsetBeg;
    }

    /* Trim based on the end offset. We don't need to silence the tail section because we'll just have a reduced value written to pFramesRead. */
    if (timeOffsetEnd > 0) {
        frameCount -= timeOffsetEnd;
    }


    /* We run on different paths depending on the bus counts. */
    inputBusCount  = ma_node_get_input_bus_count(pNode);
    outputBusCount = ma_node_get_output_bus_count(pNode);

    /*
    Run a simplified path when there are no inputs and one output. In this case there's nothing to
    actually read and we can go straight to output. This is a very common scenario because the vast
    majority of data source nodes will use this setup so this optimization I think is worthwhile.
    */
    if (inputBusCount == 0 && outputBusCount == 1) {
        /* Fast path. No need to read from input and no need for any caching. */
        ma_uint32 inputFrameCount  = 0;
        ma_uint32 outputFrameCount = frameCount;    /* Just read as much as we can. The callback will return what was actually read. */

        /* Don't do anything if our read counter is ahead of the node graph. That means we're */
        ppFramesOut[0] = pFramesOut;
        ma_node_process_pcm_frames_internal(pNode, NULL, &inputFrameCount, ppFramesOut, &outputFrameCount);
        totalFramesRead = outputFrameCount;
    } else {
        /* Slow path. Need to do caching. */
        ma_uint32 framesToRead;

        /*
        We use frameCount as a basis for the number of frames to read since that's what's being
        requested, however we still need to clamp it to whatever can fit in the cache.

        This will also be used as the basis for determining how many input frames to read. This is
        not ideal because it can result in too many input frames being read which introduces latency,
        however the alternative requires us to implement another callback in the node's vtable for
        calculating the required input frame count which I'm not willing to do.

        This function will be called multiple times for each period of time, once for each output node.
        We cannot read from each input node each time this function is called. Instead we need to check
        whether or not this is first output bus to be read from for this time period, and if so, read
        from our input data.

        To determine whether or not we're ready to read data, we check a flag. There will be one flag
        for each output. When the flag is set, it means data has been read previously and that we're
        ready to advance time forward for our input nodes by reading fresh data.
        */
        framesToRead = frameCount;
        if (framesToRead > pNodeBase->cachedDataCapInFramesPerBus) {
            framesToRead = pNodeBase->cachedDataCapInFramesPerBus;
        }

        MA_ASSERT(framesToRead <= 0xFFFF);

        if (ma_node_output_bus_has_read(&pNodeBase->outputBuses[outputBusIndex])) {
            /* Getting here means we need to do another round of processing. */
            ma_uint32 frameCountIn;
            ma_uint32 frameCountOut;

            pNodeBase->cachedFrameCountOut = 0;

            /*
            We need to prepare our output frame pointers for processing. In the same iteration we need
            to mark every output bus as unread so that future calls to this function for different buses
            for the current time period don't pull in data when they should instead be reading from cache.
            */
            for (iOutputBus = 0; iOutputBus < outputBusCount; iOutputBus += 1) {
                ma_node_output_bus_set_has_read(&pNodeBase->outputBuses[iOutputBus], MA_FALSE); /* <-- This is what tells the next calls to this function for other output buses for this time period to read from cache instead of pulling in more data. */
                ppFramesOut[iOutputBus] = ma_node_get_cached_output_ptr(pNode, iOutputBus);
            }

            /* We only need to read from input buses if there isn't already some data in the cache. */
            if (pNodeBase->cachedFrameCountIn == 0) {
                /* Here is where we pull in data from the input buses. This is what will trigger an advance in time. */
                for (iInputBus = 0; iInputBus < inputBusCount; iInputBus += 1) {
                    ma_uint32 framesRead;

                    /* The first thing to do is get the offset within our bulk allocation to store this input data. */
                    ppFramesIn[iInputBus] = ma_node_get_cached_input_ptr(pNode, iInputBus);

                    /* Once we've determined out destination pointer we can read. Note that we must inspect the number of frames read and fill any leftovers with silence for safety. */
                    result = ma_node_input_bus_read_pcm_frames(pNodeBase, &pNodeBase->inputBuses[iInputBus], ppFramesIn[iInputBus], framesToRead, &framesRead, globalTime);
                    if (result != MA_SUCCESS) {
                        /* We failed to read any data. To prevent any kind of corrupted audio from being output to the speakers we'll abort with the number of frames read being explicitly set to 0. */
                        *pFramesRead = 0;
                        break;
                    }

                    /* Any leftover frames need to silenced for safety. */
                    if (framesRead < framesToRead) {
                        ma_silence_pcm_frames(ppFramesIn[iInputBus] + (framesRead * ma_node_get_input_channels(pNodeBase, iInputBus)), (framesToRead - framesRead), ma_format_f32, ma_node_get_input_channels(pNodeBase, iInputBus));
                    }
                }

                pNodeBase->cachedFrameCountIn   = (ma_uint16)framesToRead;
                pNodeBase->consumedFrameCountIn = 0;
            } else {
                /* We don't need to read anything, but we do need to prepare our input frame pointers. */
                for (iInputBus = 0; iInputBus < inputBusCount; iInputBus += 1) {
                    ppFramesIn[iInputBus] = ma_node_get_cached_input_ptr(pNode, iInputBus) + (pNodeBase->consumedFrameCountIn * ma_node_get_input_channels(pNodeBase, iInputBus));
                }
            }

            /*
            At this point we have our input data so now we need to do some processing. Sneaky little
            optimization here - we can set the pointer to the output buffer for this output bus so
            that the final copy into the output buffer is done directly by onProcess().
            */
            if (pFramesOut != NULL) {
                ppFramesOut[outputBusIndex] = pFramesOut;
            }

            frameCountIn  = pNodeBase->cachedFrameCountIn;  /* Give the processing function as much input data as we've got. */
            frameCountOut = framesToRead;                   /* Give the processing function the entire capacity of the output buffer. */
            ma_node_process_pcm_frames_internal(pNode, (const float**)ppFramesIn, &frameCountIn, ppFramesOut, &frameCountOut);    /* From GCC: expected 'const float **' but argument is of type 'float **'. Shouldn't this be implicit? Excplicit cast to silence the warning. */

            /*
            Thanks to our sneaky optimization above we don't need to do any data copying directly into
            the output buffer - the onProcess() callback just did that for us. We do, however, need to
            apply the number of input and output frames that were processed.
            */
            pNodeBase->consumedFrameCountIn += (ma_uint16)frameCountIn;
            pNodeBase->cachedFrameCountIn   -= (ma_uint16)frameCountIn;
            pNodeBase->cachedFrameCountOut   = (ma_uint16)frameCountOut;
        } else {
            /*
            We're not needing to read anything from the input buffer so just read directly from our
            already-processed data.
            */
            if (pFramesOut != NULL) {
                ma_copy_pcm_frames(pFramesOut, ma_node_get_cached_output_ptr(pNodeBase, outputBusIndex), pNodeBase->cachedFrameCountOut, ma_format_f32, ma_node_get_output_channels(pNodeBase, outputBusIndex));
            }
        }

        /* The number of frames read is always equal to the number of cached output frames. */
        totalFramesRead = pNodeBase->cachedFrameCountOut;

        /* Now that we've read the data, make sure our read flag is set. */
        ma_node_output_bus_set_has_read(&pNodeBase->outputBuses[outputBusIndex], MA_TRUE);
    }

    /* Advance our local time forward. */
    c89atomic_fetch_add_64(&pNodeBase->localTime, (ma_uint64)totalFramesRead);

    *pFramesRead = totalFramesRead + timeOffsetBeg; /* Must include the silenced section at the start of the buffer. */
    return result;
}




/* Data source node. */
MA_API ma_data_source_node_config ma_data_source_node_config_init(ma_data_source* pDataSource, ma_bool32 looping)
{
    ma_data_source_node_config config;

    MA_ZERO_OBJECT(&config);
    config.nodeConfig  = ma_node_config_init(NULL, 0, 0);
    config.pDataSource = pDataSource;
    config.looping     = looping;

    return config;
}


static void ma_data_source_node_process_pcm_frames(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    ma_data_source_node* pDataSourceNode = (ma_data_source_node*)pNode;
    ma_format format;
    ma_uint32 channels;
    ma_uint32 frameCount;
    ma_uint64 framesRead = 0;

    MA_ASSERT(pDataSourceNode != NULL);
    MA_ASSERT(pDataSourceNode->pDataSource != NULL);
    MA_ASSERT(ma_node_get_input_bus_count(pDataSourceNode)  == 0);
    MA_ASSERT(ma_node_get_output_bus_count(pDataSourceNode) == 1);

    /* We don't want to read from ppFramesIn at all. Instead we read from the data source. */
    (void)ppFramesIn;
    (void)pFrameCountIn;

    frameCount = *pFrameCountOut;

    if (ma_data_source_get_data_format(pDataSourceNode->pDataSource, &format, &channels, NULL) == MA_SUCCESS) { /* <-- Don't care about sample rate here. */
        /* The node graph system requires samples be in floating point format. This is checked in ma_data_source_node_init(). */
        MA_ASSERT(format == ma_format_f32);
        (void)format;   /* Just to silence some static analysis tools. */

        ma_data_source_read_pcm_frames(pDataSourceNode->pDataSource, ppFramesOut[0], frameCount, &framesRead, c89atomic_load_32(&pDataSourceNode->looping));
    }

    *pFrameCountOut = (ma_uint32)framesRead;
}

static ma_node_vtable g_ma_data_source_node_vtable =
{
    ma_data_source_node_process_pcm_frames,
    0,  /* 0 input buses. */
    1,  /* 1 output bus. */
    0
};

MA_API ma_result ma_data_source_node_init(ma_node_graph* pNodeGraph, const ma_data_source_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_data_source_node* pDataSourceNode)
{
    ma_result result;
    ma_format format;   /* For validating the format, which must be ma_format_f32. */
    ma_uint32 channels; /* For specifying the channel count of the output bus. */
    ma_node_config baseConfig;

    if (pDataSourceNode == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pDataSourceNode);
    
    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    result = ma_data_source_get_data_format(pConfig->pDataSource, &format, &channels, NULL);    /* Don't care about sample rate. This will check pDataSource for NULL. */
    if (result != MA_SUCCESS) {
        return result;
    }

    MA_ASSERT(format == ma_format_f32); /* <-- If you've triggered this it means your data source is not outputting floating-point samples. You must configure your data source to use ma_format_f32. */
    if (format != ma_format_f32) {
        return MA_INVALID_ARGS; /* Invalid format. */
    }

    /* The channel count is defined by the data source. If the caller has manually changed the channels we just ignore it. */
    baseConfig = pConfig->nodeConfig;
    baseConfig.vtable = &g_ma_data_source_node_vtable;  /* Explicitly set the vtable here to prevent callers from setting it incorrectly. */

    /*
    The channel count is defined by the data source. It is invalid for the caller to manually set
    the channel counts in the config. `ma_data_source_node_config_init()` will have defaulted the
    channel count to 0 which is how it must remain. If you trigger any of these asserts, it means
    you're explicitly setting the channel count. Instead, configure the output channel count of
    your data source to be the necessary channel count.
    */
    if (baseConfig.outputChannels[0] != 0) {
        return MA_INVALID_ARGS;
    }

    baseConfig.outputChannels[0] = channels;

    result = ma_node_init(pNodeGraph, &baseConfig, pAllocationCallbacks, &pDataSourceNode->base);
    if (result != MA_SUCCESS) {
        return result;
    }

    pDataSourceNode->pDataSource = pConfig->pDataSource;
    pDataSourceNode->looping     = pConfig->looping;

    return MA_SUCCESS;
}

MA_API void ma_data_source_node_uninit(ma_data_source_node* pDataSourceNode, const ma_allocation_callbacks* pAllocationCallbacks)
{
    ma_node_uninit(&pDataSourceNode->base, pAllocationCallbacks);
}

MA_API ma_result ma_data_source_node_set_looping(ma_data_source_node* pDataSourceNode, ma_bool32 looping)
{
    if (pDataSourceNode == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_32(&pDataSourceNode->looping, looping);

    return MA_SUCCESS;
}

MA_API ma_bool32 ma_data_source_node_is_looping(ma_data_source_node* pDataSourceNode)
{
    if (pDataSourceNode == NULL) {
        return MA_FALSE;
    }

    return c89atomic_load_32(&pDataSourceNode->looping);
}



/* Splitter Node. */
MA_API ma_splitter_node_config ma_splitter_node_config_init(ma_uint32 channels)
{
    ma_splitter_node_config config;

    MA_ZERO_OBJECT(&config);
    config.nodeConfig = ma_node_config_init(NULL, channels, channels);  /* Same channel count between inputs and outputs are required for splitters. */

    return config;
}


static void ma_splitter_node_process_pcm_frames(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    ma_node_base* pNodeBase = (ma_node_base*)pNode;
    ma_uint32 iOutputBus;
    ma_uint32 channels;

    MA_ASSERT(pNodeBase != NULL);
    MA_ASSERT(ma_node_get_input_bus_count(pNodeBase)  == 1);
    MA_ASSERT(ma_node_get_output_bus_count(pNodeBase) >= 2);

    /* We don't need to consider the input frame count - it'll be the same as the output frame count and we process everything. */
    (void)pFrameCountIn;

    /* NOTE: This assumes the same number of channels for all inputs and outputs. This was checked in ma_splitter_node_init(). */
    channels = ma_node_get_input_channels(pNodeBase, 0);

    /* Splitting is just copying the first input bus and copying it over to each output bus. */
    for (iOutputBus = 0; iOutputBus < ma_node_get_output_bus_count(pNodeBase); iOutputBus += 1) {
        ma_copy_pcm_frames(ppFramesOut[iOutputBus], ppFramesIn[0], *pFrameCountOut, ma_format_f32, channels);
    }
}

static ma_node_vtable g_ma_splitter_node_vtable =
{
    ma_splitter_node_process_pcm_frames,
    1,  /* 1 input bus. */
    2,  /* 2 output buses. */
    0
};

MA_API ma_result ma_splitter_node_init(ma_node_graph* pNodeGraph, const ma_splitter_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_splitter_node* pSplitterNode)
{
    ma_result result;
    ma_node_config baseConfig;

    if (pSplitterNode == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pSplitterNode);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Splitters require the same number of channels between inputs and outputs. */
    if (pConfig->nodeConfig.inputChannels[0] != pConfig->nodeConfig.outputChannels[0]) {
        return MA_INVALID_ARGS;
    }

    baseConfig = pConfig->nodeConfig;
    baseConfig.vtable = &g_ma_splitter_node_vtable;

    result = ma_node_init(pNodeGraph, &baseConfig, pAllocationCallbacks, &pSplitterNode->base);
    if (result != MA_SUCCESS) {
        return result;  /* Failed to initialize the base node. */
    }

    return MA_SUCCESS;
}

MA_API void ma_splitter_node_uninit(ma_splitter_node* pSplitterNode, const ma_allocation_callbacks* pAllocationCallbacks)
{
    ma_node_uninit(pSplitterNode, pAllocationCallbacks);
}





#ifndef MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS
#define MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS   1000
#endif


static ma_uint32 ma_ffs_32(ma_uint32 x)
{
    ma_uint32 i;

    /* Just a naive implementation just to get things working for now. Will optimize this later. */
    for (i = 0; i < 32; i += 1) {
        if ((x & (1 << i)) != 0) {
            return i;
        }
    }

    return i;
}



#if 0
static void ma_accumulate_and_clip_u8(ma_uint8* pDst, const ma_int16* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_u8(ma_pcm_sample_u8_to_s16_no_scale(pDst[iSample]) + pSrc[iSample]);
    }
}

static void ma_accumulate_and_clip_s16(ma_int16* pDst, const ma_int32* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s16(pDst[iSample] + pSrc[iSample]);
    }
}

static void ma_accumulate_and_clip_s24(ma_uint8* pDst, const ma_int64* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        ma_int64 s = ma_clip_s24(ma_pcm_sample_s24_to_s32_no_scale(&pDst[iSample*3]) + pSrc[iSample]);
        pDst[iSample*3 + 0] = (ma_uint8)((s & 0x000000FF) >>  0);
        pDst[iSample*3 + 1] = (ma_uint8)((s & 0x0000FF00) >>  8);
        pDst[iSample*3 + 2] = (ma_uint8)((s & 0x00FF0000) >> 16);
    }
}

static void ma_accumulate_and_clip_s32(ma_int32* pDst, const ma_int64* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s32(pDst[iSample] + pSrc[iSample]);
    }
}

static void ma_accumulate_and_clip_f32(float* pDst, const float* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_f32(pDst[iSample] + pSrc[iSample]);
    }
}
#endif


static void ma_clip_samples_u8(ma_uint8* pDst, const ma_int16* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_u8(pSrc[iSample]);
    }
}

static void ma_clip_samples_s16(ma_int16* pDst, const ma_int32* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s16(pSrc[iSample]);
    }
}

static void ma_clip_samples_s24(ma_uint8* pDst, const ma_int64* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        ma_int64 s = ma_clip_s24(pSrc[iSample]);
        pDst[iSample*3 + 0] = (ma_uint8)((s & 0x000000FF) >>  0);
        pDst[iSample*3 + 1] = (ma_uint8)((s & 0x0000FF00) >>  8);
        pDst[iSample*3 + 2] = (ma_uint8)((s & 0x00FF0000) >> 16);
    }
}

static void ma_clip_samples_s32(ma_int32* pDst, const ma_int64* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s32(pSrc[iSample]);
    }
}

static void ma_clip_samples_f32_ex(float* pDst, const float* pSrc, ma_uint64 count)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_f32(pSrc[iSample]);
    }
}



static void ma_volume_and_clip_samples_u8(ma_uint8* pDst, const ma_int16* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_u8(ma_apply_volume_unclipped_u8(pSrc[iSample], volumeFixed));
    }
}

static void ma_volume_and_clip_samples_s16(ma_int16* pDst, const ma_int32* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s16(ma_apply_volume_unclipped_s16(pSrc[iSample], volumeFixed));
    }
}

static void ma_volume_and_clip_samples_s24(ma_uint8* pDst, const ma_int64* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        ma_int64 s = ma_clip_s24(ma_apply_volume_unclipped_s24(pSrc[iSample], volumeFixed));
        pDst[iSample*3 + 0] = (ma_uint8)((s & 0x000000FF) >>  0);
        pDst[iSample*3 + 1] = (ma_uint8)((s & 0x0000FF00) >>  8);
        pDst[iSample*3 + 2] = (ma_uint8)((s & 0x00FF0000) >> 16);
    }
}

static void ma_volume_and_clip_samples_s32(ma_int32* pDst, const ma_int64* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s32(ma_apply_volume_unclipped_s32(pSrc[iSample], volumeFixed));
    }
}

static void ma_volume_and_clip_samples_f32(float* pDst, const float* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    /* For the f32 case we need to make sure this supports in-place processing where the input and output buffers are the same. */

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_f32(ma_apply_volume_unclipped_f32(pSrc[iSample], volume));
    }
}

static void ma_clip_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels)
{
    ma_uint64 sampleCount;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    sampleCount = frameCount * channels;

    switch (format) {
        case ma_format_u8:  ma_clip_samples_u8( (ma_uint8*)pDst, (const ma_int16*)pSrc, sampleCount); break;
        case ma_format_s16: ma_clip_samples_s16((ma_int16*)pDst, (const ma_int32*)pSrc, sampleCount); break;
        case ma_format_s24: ma_clip_samples_s24((ma_uint8*)pDst, (const ma_int64*)pSrc, sampleCount); break;
        case ma_format_s32: ma_clip_samples_s32((ma_int32*)pDst, (const ma_int64*)pSrc, sampleCount); break;
        case ma_format_f32: ma_clip_samples_f32_ex((float*)pDst, (const    float*)pSrc, sampleCount); break;
        
        /* Do nothing if we don't know the format. We're including these here to silence a compiler warning about enums not being handled by the switch. */
        case ma_format_unknown:
        case ma_format_count:
            break;
    }
}

static void ma_volume_and_clip_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels, float volume)
{
    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    if (volume == 1) {
        ma_clip_pcm_frames(pDst, pSrc, frameCount, format, channels);   /* Optimized case for volume = 1. */
    } else if (volume == 0) {
        ma_silence_pcm_frames(pDst, frameCount, format, channels);      /* Optimized case for volume = 0. */
    } else {
        ma_uint64 sampleCount = frameCount * channels;

        switch (format) {
            case ma_format_u8:  ma_volume_and_clip_samples_u8( (ma_uint8*)pDst, (const ma_int16*)pSrc, sampleCount, volume); break;
            case ma_format_s16: ma_volume_and_clip_samples_s16((ma_int16*)pDst, (const ma_int32*)pSrc, sampleCount, volume); break;
            case ma_format_s24: ma_volume_and_clip_samples_s24((ma_uint8*)pDst, (const ma_int64*)pSrc, sampleCount, volume); break;
            case ma_format_s32: ma_volume_and_clip_samples_s32((ma_int32*)pDst, (const ma_int64*)pSrc, sampleCount, volume); break;
            case ma_format_f32: ma_volume_and_clip_samples_f32((   float*)pDst, (const    float*)pSrc, sampleCount, volume); break;
            
            /* Do nothing if we don't know the format. We're including these here to silence a compiler warning about enums not being handled by the switch. */
            case ma_format_unknown:
            case ma_format_count:
                break;
        }
    }
}


/* Not used at the moment, but leaving it here in case I want to use it again later. */
#if 0
static void ma_clipped_accumulate_u8(ma_uint8* pDst, const ma_uint8* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = ma_clip_u8(ma_pcm_sample_u8_to_s16_no_scale(pDst[iSample]) + ma_pcm_sample_u8_to_s16_no_scale(pSrc[iSample]));
    }
}

static void ma_clipped_accumulate_s16(ma_int16* pDst, const ma_int16* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = ma_clip_s16((ma_int32)pDst[iSample] + (ma_int32)pSrc[iSample]);
    }
}

static void ma_clipped_accumulate_s24(ma_uint8* pDst, const ma_uint8* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        ma_int64 s = ma_clip_s24(ma_pcm_sample_s24_to_s32_no_scale(&pDst[iSample*3]) + ma_pcm_sample_s24_to_s32_no_scale(&pSrc[iSample*3]));
        pDst[iSample*3 + 0] = (ma_uint8)((s & 0x000000FF) >>  0);
        pDst[iSample*3 + 1] = (ma_uint8)((s & 0x0000FF00) >>  8);
        pDst[iSample*3 + 2] = (ma_uint8)((s & 0x00FF0000) >> 16);
    }
}

static void ma_clipped_accumulate_s32(ma_int32* pDst, const ma_int32* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = ma_clip_s32((ma_int64)pDst[iSample] + (ma_int64)pSrc[iSample]);
    }
}

static void ma_clipped_accumulate_f32(float* pDst, const float* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = ma_clip_f32(pDst[iSample] + pSrc[iSample]);
    }
}

static void ma_clipped_accumulate_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels)
{
    ma_uint64 sampleCount;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    sampleCount = frameCount * channels;

    switch (format) {
        case ma_format_u8:  ma_clipped_accumulate_u8( (ma_uint8*)pDst, (const ma_uint8*)pSrc, sampleCount); break;
        case ma_format_s16: ma_clipped_accumulate_s16((ma_int16*)pDst, (const ma_int16*)pSrc, sampleCount); break;
        case ma_format_s24: ma_clipped_accumulate_s24((ma_uint8*)pDst, (const ma_uint8*)pSrc, sampleCount); break;
        case ma_format_s32: ma_clipped_accumulate_s32((ma_int32*)pDst, (const ma_int32*)pSrc, sampleCount); break;
        case ma_format_f32: ma_clipped_accumulate_f32((   float*)pDst, (const    float*)pSrc, sampleCount); break;

        /* Do nothing if we don't know the format. We're including these here to silence a compiler warning about enums not being handled by the switch. */
        case ma_format_unknown:
        case ma_format_count:
            break;
    }
}
#endif


static void ma_unclipped_accumulate_u8(ma_int16* pDst, const ma_uint8* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = pDst[iSample] + ma_pcm_sample_u8_to_s16_no_scale(pSrc[iSample]);
    }
}

static void ma_unclipped_accumulate_s16(ma_int32* pDst, const ma_int16* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = (ma_int32)pDst[iSample] + (ma_int32)pSrc[iSample];
    }
}

static void ma_unclipped_accumulate_s24(ma_int64* pDst, const ma_uint8* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = pDst[iSample] + ma_pcm_sample_s24_to_s32_no_scale(&pSrc[iSample*3]);
    }
}

static void ma_unclipped_accumulate_s32(ma_int64* pDst, const ma_int32* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = (ma_int64)pDst[iSample] + (ma_int64)pSrc[iSample];
    }
}

static void ma_unclipped_accumulate_f32(float* pDst, const float* pSrc, ma_uint64 sampleCount)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] = pDst[iSample] + pSrc[iSample];
    }
}

static void ma_unclipped_accumulate_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels)
{
    ma_uint64 sampleCount;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    sampleCount = frameCount * channels;

    switch (format) {
        case ma_format_u8:  ma_unclipped_accumulate_u8( (ma_int16*)pDst, (const ma_uint8*)pSrc, sampleCount); break;
        case ma_format_s16: ma_unclipped_accumulate_s16((ma_int32*)pDst, (const ma_int16*)pSrc, sampleCount); break;
        case ma_format_s24: ma_unclipped_accumulate_s24((ma_int64*)pDst, (const ma_uint8*)pSrc, sampleCount); break;
        case ma_format_s32: ma_unclipped_accumulate_s32((ma_int64*)pDst, (const ma_int32*)pSrc, sampleCount); break;
        case ma_format_f32: ma_unclipped_accumulate_f32((   float*)pDst, (const    float*)pSrc, sampleCount); break;

        /* Do nothing if we don't know the format. We're including these here to silence a compiler warning about enums not being handled by the switch. */
        case ma_format_unknown:
        case ma_format_count:
            break;
    }
}


#if 0
static void ma_volume_and_accumulate_and_clip_u8(ma_uint8* pDst, const ma_int16* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_u8(ma_pcm_sample_u8_to_s16_no_scale(pDst[iSample]) + ma_apply_volume_unclipped_u8(pSrc[iSample], volumeFixed));
    }
}

static void ma_volume_and_accumulate_and_clip_s16(ma_int16* pDst, const ma_int32* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_s16(pDst[iSample] + ma_apply_volume_unclipped_s16(pSrc[iSample], volumeFixed));
    }
}

static void ma_volume_and_accumulate_and_clip_s24(ma_uint8* pDst, const ma_int64* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        ma_int64 s = ma_clip_s24(ma_pcm_sample_s24_to_s32_no_scale(&pDst[iSample*3]) + ma_apply_volume_unclipped_s24(pSrc[iSample], volumeFixed));
        pDst[iSample*3 + 0] = (ma_uint8)((s & 0x000000FF) >>  0);
        pDst[iSample*3 + 1] = (ma_uint8)((s & 0x0000FF00) >>  8);
        pDst[iSample*3 + 2] = (ma_uint8)((s & 0x00FF0000) >> 16);
    }
}

static void ma_volume_and_accumulate_and_clip_s32(ma_int32* dst, const ma_int64* src, ma_uint64 count, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(dst != NULL);
    MA_ASSERT(src != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < count; iSample += 1) {
        dst[iSample] = ma_clip_s32(dst[iSample] + ma_apply_volume_unclipped_s32(src[iSample], volumeFixed));
    }
}

static void ma_volume_and_accumulate_and_clip_f32(float* pDst, const float* pSrc, ma_uint64 count, float volume)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < count; iSample += 1) {
        pDst[iSample] = ma_clip_f32(pDst[iSample] + ma_apply_volume_unclipped_f32(pSrc[iSample], volume));
    }
}

static ma_result ma_volume_and_accumulate_and_clip_pcm_frames(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format format, ma_uint32 channels, float volume)
{
    ma_uint64 sampleCount;

    if (pDst == NULL || pSrc == NULL) {
        return MA_INVALID_ARGS;
    }

    /* The output buffer cannot be the same as the accumulation buffer. */
    if (pDst == pSrc) {
        return MA_INVALID_OPERATION;
    }

    /* No-op if there's no volume. */
    if (volume == 0) {
        return MA_SUCCESS;
    }

    sampleCount = frameCount * channels;

    /* No need for volume control if the volume is 1. */
    if (volume == 1) {
        switch (format) {
            case ma_format_u8:  ma_accumulate_and_clip_u8( pDst, pSrc, sampleCount); break;
            case ma_format_s16: ma_accumulate_and_clip_s16(pDst, pSrc, sampleCount); break;
            case ma_format_s24: ma_accumulate_and_clip_s24(pDst, pSrc, sampleCount); break;
            case ma_format_s32: ma_accumulate_and_clip_s32(pDst, pSrc, sampleCount); break;
            case ma_format_f32: ma_accumulate_and_clip_f32(pDst, pSrc, sampleCount); break;
            default: return MA_INVALID_ARGS;    /* Unknown format. */
        }
    } else {
        /* Getting here means the volume is not 0 nor 1. */
        MA_ASSERT(volume != 0 && volume != 1);

        switch (format) {
            case ma_format_u8:  ma_volume_and_accumulate_and_clip_u8( pDst, pSrc, sampleCount, volume); break;
            case ma_format_s16: ma_volume_and_accumulate_and_clip_s16(pDst, pSrc, sampleCount, volume); break;
            case ma_format_s24: ma_volume_and_accumulate_and_clip_s24(pDst, pSrc, sampleCount, volume); break;
            case ma_format_s32: ma_volume_and_accumulate_and_clip_s32(pDst, pSrc, sampleCount, volume); break;
            case ma_format_f32: ma_volume_and_accumulate_and_clip_f32(pDst, pSrc, sampleCount, volume); break;
            default: return MA_INVALID_ARGS;        /* Unknown format. */
        }
    }

    return MA_SUCCESS;
}
#endif



static void ma_mix_accumulation_buffers_u8(ma_int16* pDst, const ma_int16* pSrc, ma_uint64 sampleCount, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] += ma_apply_volume_unclipped_u8(pSrc[iSample], volumeFixed);
    }
}

static void ma_mix_accumulation_buffers_s16(ma_int32* pDst, const ma_int32* pSrc, ma_uint64 sampleCount, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] += ma_apply_volume_unclipped_s16(pSrc[iSample], volumeFixed);
    }
}

static void ma_mix_accumulation_buffers_s24(ma_int64* pDst, const ma_int64* pSrc, ma_uint64 sampleCount, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] += ma_apply_volume_unclipped_s24(pSrc[iSample], volumeFixed);
    }
}

static void ma_mix_accumulation_buffers_s32(ma_int64* pDst, const ma_int64* pSrc, ma_uint64 sampleCount, float volume)
{
    ma_uint64 iSample;
    ma_int16  volumeFixed;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    volumeFixed = ma_float_to_fixed_16(volume);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] += ma_apply_volume_unclipped_s32(pSrc[iSample], volumeFixed);
    }
}

static void ma_mix_accumulation_buffers_f32(float* pDst, const float* pSrc, ma_uint64 sampleCount, float volume)
{
    ma_uint64 iSample;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    for (iSample = 0; iSample < sampleCount; iSample += 1) {
        pDst[iSample] += ma_apply_volume_unclipped_f32(pSrc[iSample], volume);
    }
}

static void ma_mix_accumulation_buffers(void* pDst, const void* pSrc, ma_uint64 frameCount, ma_format formatIn, ma_uint32 channelsIn, float volume)
{
    ma_uint64 sampleCount;

    MA_ASSERT(pDst != NULL);
    MA_ASSERT(pSrc != NULL);

    sampleCount = frameCount * channelsIn;

    switch (formatIn)
    {
        case ma_format_u8:  ma_mix_accumulation_buffers_u8( (ma_int16*)pDst, (const ma_int16*)pSrc, sampleCount, volume); break;
        case ma_format_s16: ma_mix_accumulation_buffers_s16((ma_int32*)pDst, (const ma_int32*)pSrc, sampleCount, volume); break;
        case ma_format_s24: ma_mix_accumulation_buffers_s24((ma_int64*)pDst, (const ma_int64*)pSrc, sampleCount, volume); break;
        case ma_format_s32: ma_mix_accumulation_buffers_s32((ma_int64*)pDst, (const ma_int64*)pSrc, sampleCount, volume); break;
        case ma_format_f32: ma_mix_accumulation_buffers_f32((   float*)pDst, (const    float*)pSrc, sampleCount, volume); break;
        default: break;
    }
}

static void ma_mix_accumulation_buffers_ex(void* pDst, ma_format formatOut, ma_uint32 channelsOut, const void* pSrc, ma_format formatIn, ma_uint32 channelsIn, ma_uint64 frameCount, float volume)
{
    if (formatOut == formatIn && channelsOut == channelsIn) {
        /* Fast path. No conversion required. */
        ma_mix_accumulation_buffers(pDst, pSrc, frameCount, formatIn, channelsIn, volume);
    } else {
        /* Slow path. Conversion required. The way we're going to do this is clip the input buffer, and then use existing mixing infrastructure to mix as if it were regular input. */
        ma_uint8  clippedSrcBuffer[MA_DATA_CONVERTER_STACK_BUFFER_SIZE]; /* formatIn, channelsIn */
        ma_uint32 clippedSrcBufferCapInFrames = sizeof(clippedSrcBuffer) / ma_get_bytes_per_frame(formatIn, channelsIn);
        ma_uint64 totalFramesProcessed = 0;
        /* */ void* pRunningDst = pDst;
        const void* pRunningSrc = pSrc;

        while (totalFramesProcessed < frameCount) {
            ma_uint64 framesToProcess = frameCount - totalFramesProcessed;
            if (framesToProcess > clippedSrcBufferCapInFrames) {
                framesToProcess = clippedSrcBufferCapInFrames;
            }

            /* Volume and clip. */
            ma_volume_and_clip_pcm_frames(clippedSrcBuffer, pRunningSrc, framesToProcess, formatIn, channelsIn, volume);

            /* Mix. */
            ma_mix_pcm_frames_ex(pRunningDst, formatOut, channelsOut, clippedSrcBuffer, formatIn, channelsIn, framesToProcess, 1);
            
            totalFramesProcessed += framesToProcess;
            pRunningDst = ma_offset_ptr(pRunningDst, framesToProcess * ma_get_accumulation_bytes_per_frame(formatOut, channelsOut));
            pRunningSrc = ma_offset_ptr(pRunningSrc, framesToProcess * ma_get_accumulation_bytes_per_frame(formatIn,  channelsIn ));
        }
    }
}





MA_API ma_result ma_slot_allocator_init(ma_slot_allocator* pAllocator)
{
    if (pAllocator == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pAllocator);

    return MA_SUCCESS;
}

MA_API ma_result ma_slot_allocator_alloc(ma_slot_allocator* pAllocator, ma_uint64* pSlot)
{
    ma_uint32 capacity;
    ma_uint32 iAttempt;
    const ma_uint32 maxAttempts = 2;    /* The number of iterations to perform until returning MA_OUT_OF_MEMORY if no slots can be found. */

    if (pAllocator == NULL || pSlot == NULL) {
        return MA_INVALID_ARGS;
    }

    capacity = ma_countof(pAllocator->groups) * 32;

    for (iAttempt = 0; iAttempt < maxAttempts; iAttempt += 1) {
        /* We need to acquire a suitable bitfield first. This is a bitfield that's got an available slot within it. */
        ma_uint32 iGroup;
        for (iGroup = 0; iGroup < ma_countof(pAllocator->groups); iGroup += 1) {
            /* CAS */
            for (;;) {
                ma_uint32 oldBitfield;
                ma_uint32 newBitfield;
                ma_uint32 bitOffset;

                oldBitfield = c89atomic_load_32(&pAllocator->groups[iGroup].bitfield);  /* <-- This copy must happen. The compiler must not optimize this away. */

                /* Fast check to see if anything is available. */
                if (oldBitfield == 0xFFFFFFFF) {
                    break;  /* No available bits in this bitfield. */
                }

                bitOffset = ma_ffs_32(~oldBitfield);
                MA_ASSERT(bitOffset < 32);

                newBitfield = oldBitfield | (1 << bitOffset);

                if (c89atomic_compare_and_swap_32(&pAllocator->groups[iGroup].bitfield, oldBitfield, newBitfield) == oldBitfield) {
                    ma_uint32 slotIndex;

                    /* Increment the counter as soon as possible to have other threads report out-of-memory sooner than later. */
                    c89atomic_fetch_add_32(&pAllocator->count, 1);

                    /* The slot index is required for constructing the output value. */
                    slotIndex = (iGroup << 5) + bitOffset;  /* iGroup << 5 = iGroup * 32 */

                    /* Increment the reference count before constructing the output value. */
                    pAllocator->slots[slotIndex] += 1;  

                    /* Construct the output value. */
                    *pSlot = ((ma_uint64)pAllocator->slots[slotIndex] << 32 | slotIndex);

                    return MA_SUCCESS;
                }
            }
        }

        /* We weren't able to find a slot. If it's because we've reached our capacity we need to return MA_OUT_OF_MEMORY. Otherwise we need to do another iteration and try again. */
        if (pAllocator->count < capacity) {
            ma_yield();
        } else {
            return MA_OUT_OF_MEMORY;
        }
    }

    /* We couldn't find a slot within the maximum number of attempts. */
    return MA_OUT_OF_MEMORY;
}

MA_API ma_result ma_slot_allocator_free(ma_slot_allocator* pAllocator, ma_uint64 slot)
{
    ma_uint32 iGroup;
    ma_uint32 iBit;

    if (pAllocator == NULL) {
        return MA_INVALID_ARGS;
    }

    iGroup = (slot & 0xFFFFFFFF) >> 5;   /* slot / 32 */
    iBit   = (slot & 0xFFFFFFFF) & 31;   /* slot % 32 */

    if (iGroup >= ma_countof(pAllocator->groups)) {
        return MA_INVALID_ARGS;
    }

    MA_ASSERT(iBit < 32);   /* This must be true due to the logic we used to actually calculate it. */

    while (pAllocator->count > 0) {
        /* CAS */
        ma_uint32 oldBitfield;
        ma_uint32 newBitfield;

        oldBitfield = c89atomic_load_32(&pAllocator->groups[iGroup].bitfield);  /* <-- This copy must happen. The compiler must not optimize this away. */
        newBitfield = oldBitfield & ~(1 << iBit);

        if (c89atomic_compare_and_swap_32(&pAllocator->groups[iGroup].bitfield, oldBitfield, newBitfield) == oldBitfield) {
            c89atomic_fetch_sub_32(&pAllocator->count, 1);
            return MA_SUCCESS;
        }
    }

    /* Getting here means there are no allocations available for freeing. */
    return MA_INVALID_OPERATION;
}



MA_API ma_result ma_async_notification_signal(ma_async_notification* pNotification, int code)
{
    ma_async_notification_callbacks* pNotificationCallbacks = (ma_async_notification_callbacks*)pNotification;

    if (pNotification == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pNotificationCallbacks->onSignal == NULL) {
        return MA_NOT_IMPLEMENTED;
    }

    pNotificationCallbacks->onSignal(pNotification, code);
    return MA_INVALID_ARGS;
}


static void ma_async_notification_event__on_signal(ma_async_notification* pNotification, int code)
{
    (void)code;
    ma_async_notification_event_signal((ma_async_notification_event*)pNotification);
}

MA_API ma_result ma_async_notification_event_init(ma_async_notification_event* pNotificationEvent)
{
    ma_result result;

    if (pNotificationEvent == NULL) {
        return MA_INVALID_ARGS;
    }

    pNotificationEvent->cb.onSignal = ma_async_notification_event__on_signal;
    
    result = ma_event_init(&pNotificationEvent->e);
    if (result != MA_SUCCESS) {
        return result;
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_async_notification_event_uninit(ma_async_notification_event* pNotificationEvent)
{
    if (pNotificationEvent == NULL) {
        return MA_INVALID_ARGS;
    }

    ma_event_uninit(&pNotificationEvent->e);
    return MA_SUCCESS;
}

MA_API ma_result ma_async_notification_event_wait(ma_async_notification_event* pNotificationEvent)
{
    if (pNotificationEvent == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_event_wait(&pNotificationEvent->e);
}

MA_API ma_result ma_async_notification_event_signal(ma_async_notification_event* pNotificationEvent)
{
    if (pNotificationEvent == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_event_signal(&pNotificationEvent->e);
}



#define MA_JOB_ID_NONE      ~((ma_uint64)0)
#define MA_JOB_SLOT_NONE    (ma_uint16)(~0)

static MA_INLINE ma_uint32 ma_job_extract_refcount(ma_uint64 toc)
{
    return (ma_uint32)(toc >> 32);
}

static MA_INLINE ma_uint16 ma_job_extract_slot(ma_uint64 toc)
{
    return (ma_uint16)(toc & 0x0000FFFF);
}

static MA_INLINE ma_uint16 ma_job_extract_code(ma_uint64 toc)
{
    return (ma_uint16)((toc & 0xFFFF0000) >> 16);
}

static MA_INLINE ma_uint64 ma_job_toc_to_allocation(ma_uint64 toc)
{
    return ((ma_uint64)ma_job_extract_refcount(toc) << 32) | (ma_uint64)ma_job_extract_slot(toc);
}


MA_API ma_job ma_job_init(ma_uint16 code)
{
    ma_job job;
    
    MA_ZERO_OBJECT(&job);
    job.toc.code = code;
    job.toc.slot = MA_JOB_SLOT_NONE;    /* Temp value. Will be allocated when posted to a queue. */
    job.next     = MA_JOB_ID_NONE;

    return job;
}


/*
Lock free queue implementation based on the paper by Michael and Scott: Nonblocking Algorithms and Preemption-Safe Locking on Multiprogrammed Shared Memory Multiprocessors
*/
MA_API ma_result ma_job_queue_init(ma_uint32 flags, ma_job_queue* pQueue)
{
    if (pQueue == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pQueue);
    pQueue->flags = flags;

    ma_slot_allocator_init(&pQueue->allocator); /* Will not fail. */

    /* We need a semaphore if we're running in synchronous mode. */
    if ((pQueue->flags & MA_JOB_QUEUE_FLAG_NON_BLOCKING) == 0) {
        ma_semaphore_init(0, &pQueue->sem);
    }

    /*
    Our queue needs to be initialized with a free standing node. This should always be slot 0. Required for the lock free algorithm. The first job in the queue is
    just a dummy item for giving us the first item in the list which is stored in the "next" member.
    */
    ma_slot_allocator_alloc(&pQueue->allocator, &pQueue->head);  /* Will never fail. */
    pQueue->jobs[ma_job_extract_slot(pQueue->head)].next = MA_JOB_ID_NONE;
    pQueue->tail = pQueue->head;

    return MA_SUCCESS;
}

MA_API ma_result ma_job_queue_uninit(ma_job_queue* pQueue)
{
    if (pQueue == NULL) {
        return MA_INVALID_ARGS;
    }

    /* All we need to do is uninitialize the semaphore. */
    if ((pQueue->flags & MA_JOB_QUEUE_FLAG_NON_BLOCKING) == 0) {
        ma_semaphore_uninit(&pQueue->sem);
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_job_queue_post(ma_job_queue* pQueue, const ma_job* pJob)
{
    ma_result result;
    ma_uint64 slot;
    ma_uint64 tail;
    ma_uint64 next;

    if (pQueue == NULL || pJob == NULL) {
        return MA_INVALID_ARGS;
    }

    /* We need a new slot. */
    result = ma_slot_allocator_alloc(&pQueue->allocator, &slot);
    if (result != MA_SUCCESS) {
        return result;  /* Probably ran out of slots. If so, MA_OUT_OF_MEMORY will be returned. */
    }

    /* At this point we should have a slot to place the job. */
    MA_ASSERT(ma_job_extract_slot(slot) < MA_RESOURCE_MANAGER_JOB_QUEUE_CAPACITY);

    /* We need to put the job into memory before we do anything. */
    pQueue->jobs[ma_job_extract_slot(slot)]                = *pJob;
    pQueue->jobs[ma_job_extract_slot(slot)].toc.allocation = slot;           /* This will overwrite the job code. */
    pQueue->jobs[ma_job_extract_slot(slot)].toc.code       = pJob->toc.code; /* The job code needs to be applied again because the line above overwrote it. */
    pQueue->jobs[ma_job_extract_slot(slot)].next           = MA_JOB_ID_NONE; /* Reset for safety. */

    /* The job is stored in memory so now we need to add it to our linked list. We only ever add items to the end of the list. */
    for (;;) {
        tail = pQueue->tail;
        next = pQueue->jobs[ma_job_extract_slot(tail)].next;

        if (ma_job_toc_to_allocation(tail) == ma_job_toc_to_allocation(pQueue->tail)) {
            if (ma_job_extract_slot(next) == 0xFFFF) {
                if (c89atomic_compare_and_swap_64(&pQueue->jobs[ma_job_extract_slot(tail)].next, next, slot) == next) {
                    break;
                }
            } else {
                c89atomic_compare_and_swap_64(&pQueue->tail, tail, next);
            }
        }
    }
    c89atomic_compare_and_swap_64(&pQueue->tail, tail, slot);


    /* Signal the semaphore as the last step if we're using synchronous mode. */
    if ((pQueue->flags & MA_JOB_QUEUE_FLAG_NON_BLOCKING) == 0) {
        ma_semaphore_release(&pQueue->sem);
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_job_queue_next(ma_job_queue* pQueue, ma_job* pJob)
{
    ma_uint64 head;
    ma_uint64 tail;
    ma_uint64 next;

    if (pQueue == NULL || pJob == NULL) {
        return MA_INVALID_ARGS;
    }

    /* If we're running in synchronous mode we'll need to wait on a semaphore. */
    if ((pQueue->flags & MA_JOB_QUEUE_FLAG_NON_BLOCKING) == 0) {
        ma_semaphore_wait(&pQueue->sem);
    }

    /* Now we need to remove the root item from the list. This must be done without locking. */
    for (;;) {
        head = pQueue->head;
        tail = pQueue->tail;
        next = pQueue->jobs[ma_job_extract_slot(head)].next;

        if (ma_job_toc_to_allocation(head) == ma_job_toc_to_allocation(pQueue->head)) {
            if (ma_job_toc_to_allocation(head) == ma_job_toc_to_allocation(tail)) {
                if (ma_job_extract_slot(next) == 0xFFFF) {
                    return MA_NO_DATA_AVAILABLE;
                }
                c89atomic_compare_and_swap_64(&pQueue->tail, tail, next);
            } else {
                *pJob = pQueue->jobs[ma_job_extract_slot(next)];
                if (c89atomic_compare_and_swap_64(&pQueue->head, head, next) == head) {
                    break;
                }
            }
        }
    }

    ma_slot_allocator_free(&pQueue->allocator, head);

    /*
    If it's a quit job make sure it's put back on the queue to ensure other threads have an opportunity to detect it and terminate naturally. We
    could instead just leave it on the queue, but that would involve fiddling with the lock-free code above and I want to keep that as simple as
    possible.
    */
    if (pJob->toc.code == MA_JOB_QUIT) {
        ma_job_queue_post(pQueue, pJob);
        return MA_CANCELLED;    /* Return a cancelled status just in case the thread is checking return codes and not properly checking for a quit job. */
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_job_queue_free(ma_job_queue* pQueue, ma_job* pJob)
{
    if (pQueue == NULL || pJob == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_slot_allocator_free(&pQueue->allocator, ma_job_toc_to_allocation(pJob->toc.allocation));
}





#ifndef MA_DEFAULT_HASH_SEED
#define MA_DEFAULT_HASH_SEED    42
#endif

/* MurmurHash3. Based on code from https://github.com/PeterScott/murmur3/blob/master/murmur3.c (public domain). */
#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
    #pragma GCC diagnostic push
    #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
#endif

static MA_INLINE ma_uint32 ma_rotl32(ma_uint32 x, ma_int8 r)
{
    return (x << r) | (x >> (32 - r));
}

static MA_INLINE ma_uint32 ma_hash_getblock(const ma_uint32* blocks, int i)
{
    if (ma_is_little_endian()) {
        return blocks[i];
    } else {
        return ma_swap_endian_uint32(blocks[i]);
    }
}

static MA_INLINE ma_uint32 ma_hash_fmix32(ma_uint32 h)
{
    h ^= h >> 16;
    h *= 0x85ebca6b;
    h ^= h >> 13;
    h *= 0xc2b2ae35;
    h ^= h >> 16;
    
    return h;
}

static ma_uint32 ma_hash_32(const void* key, int len, ma_uint32 seed)
{
    const ma_uint8* data = (const ma_uint8*)key;
    const ma_uint32* blocks;
    const ma_uint8* tail;
    const int nblocks = len / 4;
    ma_uint32 h1 = seed;
    ma_uint32 c1 = 0xcc9e2d51;
    ma_uint32 c2 = 0x1b873593;
    ma_uint32 k1;
    int i;

    blocks = (const ma_uint32 *)(data + nblocks*4);

    for(i = -nblocks; i; i++) {
        k1 = ma_hash_getblock(blocks,i);

        k1 *= c1;
        k1 = ma_rotl32(k1, 15);
        k1 *= c2;
    
        h1 ^= k1;
        h1 = ma_rotl32(h1, 13); 
        h1 = h1*5 + 0xe6546b64;
    }


    tail = (const ma_uint8*)(data + nblocks*4);

    k1 = 0;
    switch(len & 3) {
        case 3: k1 ^= tail[2] << 16;
        case 2: k1 ^= tail[1] << 8;
        case 1: k1 ^= tail[0];
                k1 *= c1; k1 = ma_rotl32(k1, 15); k1 *= c2; h1 ^= k1;
    };


    h1 ^= len;
    h1  = ma_hash_fmix32(h1);

    return h1;
}

#if defined(__clang__) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
    #pragma GCC diagnostic push
#endif
/* End MurmurHash3 */

static ma_uint32 ma_hash_string_32(const char* str)
{
    return ma_hash_32(str, (int)strlen(str), MA_DEFAULT_HASH_SEED);
}



/*
Basic BST Functions
*/
static ma_result ma_resource_manager_data_buffer_node_search(ma_resource_manager* pResourceManager, ma_uint32 hashedName32, ma_resource_manager_data_buffer_node** ppDataBufferNode)
{
    ma_resource_manager_data_buffer_node* pCurrentNode;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(ppDataBufferNode != NULL);

    pCurrentNode = pResourceManager->pRootDataBufferNode;
    while (pCurrentNode != NULL) {
        if (hashedName32 == pCurrentNode->hashedName32) {
            break;  /* Found. */
        } else if (hashedName32 < pCurrentNode->hashedName32) {
            pCurrentNode = pCurrentNode->pChildLo;
        } else {
            pCurrentNode = pCurrentNode->pChildHi;
        }
    }

    *ppDataBufferNode = pCurrentNode;

    if (pCurrentNode == NULL) {
        return MA_DOES_NOT_EXIST;
    } else {
        return MA_SUCCESS;
    }
}

static ma_result ma_resource_manager_data_buffer_node_insert_point(ma_resource_manager* pResourceManager, ma_uint32 hashedName32, ma_resource_manager_data_buffer_node** ppInsertPoint)
{
    ma_result result = MA_SUCCESS;
    ma_resource_manager_data_buffer_node* pCurrentNode;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(ppInsertPoint    != NULL);

    *ppInsertPoint = NULL;

    if (pResourceManager->pRootDataBufferNode == NULL) {
        return MA_SUCCESS;  /* No items. */
    }

    /* We need to find the node that will become the parent of the new node. If a node is found that already has the same hashed name we need to return MA_ALREADY_EXISTS. */
    pCurrentNode = pResourceManager->pRootDataBufferNode;
    while (pCurrentNode != NULL) {
        if (hashedName32 == pCurrentNode->hashedName32) {
            result = MA_ALREADY_EXISTS;
            break;
        } else {
            if (hashedName32 < pCurrentNode->hashedName32) {
                if (pCurrentNode->pChildLo == NULL) {
                    result = MA_SUCCESS;
                    break;
                } else {
                    pCurrentNode = pCurrentNode->pChildLo;
                }
            } else {
                if (pCurrentNode->pChildHi == NULL) {
                    result = MA_SUCCESS;
                    break;
                } else {
                    pCurrentNode = pCurrentNode->pChildHi;
                }
            }
        }
    }

    *ppInsertPoint = pCurrentNode;
    return result;
}

static ma_result ma_resource_manager_data_buffer_node_insert_at(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode, ma_resource_manager_data_buffer_node* pInsertPoint)
{
    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    /* The key must have been set before calling this function. */
    MA_ASSERT(pDataBufferNode->hashedName32 != 0);

    if (pInsertPoint == NULL) {
        /* It's the first node. */
        pResourceManager->pRootDataBufferNode = pDataBufferNode;
    } else {
        /* It's not the first node. It needs to be inserted. */
        if (pDataBufferNode->hashedName32 < pInsertPoint->hashedName32) {
            MA_ASSERT(pInsertPoint->pChildLo == NULL);
            pInsertPoint->pChildLo = pDataBufferNode;
        } else {
            MA_ASSERT(pInsertPoint->pChildHi == NULL);
            pInsertPoint->pChildHi = pDataBufferNode;
        }
    }

    pDataBufferNode->pParent = pInsertPoint;

    return MA_SUCCESS;
}

#if 0   /* Unused for now. */
static ma_result ma_resource_manager_data_buffer_node_insert(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    ma_result result;
    ma_resource_manager_data_buffer_node* pInsertPoint;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    result = ma_resource_manager_data_buffer_node_insert_point(pResourceManager, pDataBufferNode->hashedName32, &pInsertPoint);
    if (result != MA_SUCCESS) {
        return MA_INVALID_ARGS;
    }

    return ma_resource_manager_data_buffer_node_insert_at(pResourceManager, pDataBufferNode, pInsertPoint);
}
#endif

static MA_INLINE ma_resource_manager_data_buffer_node* ma_resource_manager_data_buffer_node_find_min(ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    ma_resource_manager_data_buffer_node* pCurrentNode;

    MA_ASSERT(pDataBufferNode != NULL);

    pCurrentNode = pDataBufferNode;
    while (pCurrentNode->pChildLo != NULL) {
        pCurrentNode = pCurrentNode->pChildLo;
    }

    return pCurrentNode;
}

static MA_INLINE ma_resource_manager_data_buffer_node* ma_resource_manager_data_buffer_node_find_max(ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    ma_resource_manager_data_buffer_node* pCurrentNode;

    MA_ASSERT(pDataBufferNode != NULL);

    pCurrentNode = pDataBufferNode;
    while (pCurrentNode->pChildHi != NULL) {
        pCurrentNode = pCurrentNode->pChildHi;
    }

    return pCurrentNode;
}

static MA_INLINE ma_resource_manager_data_buffer_node* ma_resource_manager_data_buffer_node_find_inorder_successor(ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    MA_ASSERT(pDataBufferNode           != NULL);
    MA_ASSERT(pDataBufferNode->pChildHi != NULL);

    return ma_resource_manager_data_buffer_node_find_min(pDataBufferNode->pChildHi);
}

static MA_INLINE ma_resource_manager_data_buffer_node* ma_resource_manager_data_buffer_node_find_inorder_predecessor(ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    MA_ASSERT(pDataBufferNode           != NULL);
    MA_ASSERT(pDataBufferNode->pChildLo != NULL);

    return ma_resource_manager_data_buffer_node_find_max(pDataBufferNode->pChildLo);
}

static ma_result ma_resource_manager_data_buffer_node_remove(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    if (pDataBufferNode->pChildLo == NULL) {
        if (pDataBufferNode->pChildHi == NULL) {
            /* Simple case - deleting a buffer with no children. */
            if (pDataBufferNode->pParent == NULL) {
                MA_ASSERT(pResourceManager->pRootDataBufferNode == pDataBufferNode);    /* There is only a single buffer in the tree which should be equal to the root node. */
                pResourceManager->pRootDataBufferNode = NULL;
            } else {
                if (pDataBufferNode->pParent->pChildLo == pDataBufferNode) {
                    pDataBufferNode->pParent->pChildLo = NULL;
                } else {
                    pDataBufferNode->pParent->pChildHi = NULL;
                }
            }
        } else {
            /* Node has one child - pChildHi != NULL. */
            pDataBufferNode->pChildHi->pParent = pDataBufferNode->pParent;

            if (pDataBufferNode->pParent == NULL) {
                MA_ASSERT(pResourceManager->pRootDataBufferNode == pDataBufferNode);
                pResourceManager->pRootDataBufferNode = pDataBufferNode->pChildHi;
            } else {
                if (pDataBufferNode->pParent->pChildLo == pDataBufferNode) {
                    pDataBufferNode->pParent->pChildLo = pDataBufferNode->pChildHi;
                } else {
                    pDataBufferNode->pParent->pChildHi = pDataBufferNode->pChildHi;
                }
            }
        }
    } else {
        if (pDataBufferNode->pChildHi == NULL) {
            /* Node has one child - pChildLo != NULL. */
            pDataBufferNode->pChildLo->pParent = pDataBufferNode->pParent;

            if (pDataBufferNode->pParent == NULL) {
                MA_ASSERT(pResourceManager->pRootDataBufferNode == pDataBufferNode);
                pResourceManager->pRootDataBufferNode = pDataBufferNode->pChildLo;
            } else {
                if (pDataBufferNode->pParent->pChildLo == pDataBufferNode) {
                    pDataBufferNode->pParent->pChildLo = pDataBufferNode->pChildLo;
                } else {
                    pDataBufferNode->pParent->pChildHi = pDataBufferNode->pChildLo;
                }
            }
        } else {
            /* Complex case - deleting a node with two children. */
            ma_resource_manager_data_buffer_node* pReplacementDataBufferNode;

            /* For now we are just going to use the in-order successor as the replacement, but we may want to try to keep this balanced by switching between the two. */
            pReplacementDataBufferNode = ma_resource_manager_data_buffer_node_find_inorder_successor(pDataBufferNode);
            MA_ASSERT(pReplacementDataBufferNode != NULL);

            /*
            Now that we have our replacement node we can make the change. The simple way to do this would be to just exchange the values, and then remove the replacement
            node, however we track specific nodes via pointers which means we can't just swap out the values. We need to instead just change the pointers around. The
            replacement node should have at most 1 child. Therefore, we can detach it in terms of our simpler cases above. What we're essentially doing is detaching the
            replacement node and reinserting it into the same position as the deleted node.
            */
            MA_ASSERT(pReplacementDataBufferNode->pParent  != NULL);  /* The replacement node should never be the root which means it should always have a parent. */
            MA_ASSERT(pReplacementDataBufferNode->pChildLo == NULL);  /* Because we used in-order successor. This would be pChildHi == NULL if we used in-order predecessor. */

            if (pReplacementDataBufferNode->pChildHi == NULL) {
                if (pReplacementDataBufferNode->pParent->pChildLo == pReplacementDataBufferNode) {
                    pReplacementDataBufferNode->pParent->pChildLo = NULL;
                } else {
                    pReplacementDataBufferNode->pParent->pChildHi = NULL;
                }
            } else {
                if (pReplacementDataBufferNode->pParent->pChildLo == pReplacementDataBufferNode) {
                    pReplacementDataBufferNode->pParent->pChildLo = pReplacementDataBufferNode->pChildHi;
                } else {
                    pReplacementDataBufferNode->pParent->pChildHi = pReplacementDataBufferNode->pChildHi;
                }
            }


            /* The replacement node has essentially been detached from the binary tree, so now we need to replace the old data buffer with it. The first thing to update is the parent */
            if (pDataBufferNode->pParent != NULL) {
                if (pDataBufferNode->pParent->pChildLo == pDataBufferNode) {
                    pDataBufferNode->pParent->pChildLo = pReplacementDataBufferNode;
                } else {
                    pDataBufferNode->pParent->pChildHi = pReplacementDataBufferNode;
                }
            }

            /* Now need to update the replacement node's pointers. */
            pReplacementDataBufferNode->pParent  = pDataBufferNode->pParent;
            pReplacementDataBufferNode->pChildLo = pDataBufferNode->pChildLo;
            pReplacementDataBufferNode->pChildHi = pDataBufferNode->pChildHi;

            /* Now the children of the replacement node need to have their parent pointers updated. */
            if (pReplacementDataBufferNode->pChildLo != NULL) {
                pReplacementDataBufferNode->pChildLo->pParent = pReplacementDataBufferNode;
            }
            if (pReplacementDataBufferNode->pChildHi != NULL) {
                pReplacementDataBufferNode->pChildHi->pParent = pReplacementDataBufferNode;
            }

            /* Now the root node needs to be updated. */
            if (pResourceManager->pRootDataBufferNode == pDataBufferNode) {
                pResourceManager->pRootDataBufferNode = pReplacementDataBufferNode;
            }
        }
    }

    return MA_SUCCESS;
}

#if 0   /* Unused for now. */
static ma_result ma_resource_manager_data_buffer_node_remove_by_key(ma_resource_manager* pResourceManager, ma_uint32 hashedName32)
{
    ma_result result;
    ma_resource_manager_data_buffer_node* pDataBufferNode;

    result = ma_resource_manager_data_buffer_search(pResourceManager, hashedName32, &pDataBufferNode);
    if (result != MA_SUCCESS) {
        return result;  /* Could not find the data buffer. */
    }

    return ma_resource_manager_data_buffer_remove(pResourceManager, pDataBufferNode);
}
#endif

static ma_result ma_resource_manager_data_buffer_node_increment_ref(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode, ma_uint32* pNewRefCount)
{
    ma_uint32 refCount;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    (void)pResourceManager;

    refCount = c89atomic_fetch_add_32(&pDataBufferNode->refCount, 1) + 1;

    if (pNewRefCount != NULL) {
        *pNewRefCount = refCount;
    }

    return MA_SUCCESS;
}

static ma_result ma_resource_manager_data_buffer_node_decrement_ref(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode, ma_uint32* pNewRefCount)
{
    ma_uint32 refCount;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    (void)pResourceManager;

    refCount = c89atomic_fetch_sub_32(&pDataBufferNode->refCount, 1) - 1;

    if (pNewRefCount != NULL) {
        *pNewRefCount = refCount;
    }

    return MA_SUCCESS;
}

static void ma_resource_manager_data_buffer_node_free(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBufferNode  != NULL);

    if (pDataBufferNode->isDataOwnedByResourceManager) {
        if (pDataBufferNode->data.type == ma_resource_manager_data_buffer_encoding_encoded) {
            ma__free_from_callbacks((void*)pDataBufferNode->data.encoded.pData, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_ENCODED_BUFFER*/);
            pDataBufferNode->data.encoded.pData       = NULL;
            pDataBufferNode->data.encoded.sizeInBytes = 0;
        } else {
            ma__free_from_callbacks((void*)pDataBufferNode->data.decoded.pData, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
            pDataBufferNode->data.decoded.pData       = NULL;
            pDataBufferNode->data.decoded.frameCount  = 0;
        }
    }

    /* The data buffer itself needs to be freed. */
    ma__free_from_callbacks(pDataBufferNode, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
}

static ma_result ma_resource_manager_data_buffer_node_result(const ma_resource_manager_data_buffer_node* pDataBufferNode)
{
    MA_ASSERT(pDataBufferNode != NULL);

    return c89atomic_load_i32((ma_result*)&pDataBufferNode->result);    /* Need a naughty const-cast here. */
}


static ma_thread_result MA_THREADCALL ma_resource_manager_job_thread(void* pUserData)
{
    ma_resource_manager* pResourceManager = (ma_resource_manager*)pUserData;
    MA_ASSERT(pResourceManager != NULL);

    for (;;) {
        ma_result result;
        ma_job job;

        result = ma_resource_manager_next_job(pResourceManager, &job);
        if (result != MA_SUCCESS) {
            break;
        }

        /* Terminate if we got a quit message. */
        if (job.toc.code == MA_JOB_QUIT) {
            break;
        }

        ma_resource_manager_process_job(pResourceManager, &job);
    }

    return (ma_thread_result)0;
}


MA_API ma_resource_manager_config ma_resource_manager_config_init()
{
    ma_resource_manager_config config;

    MA_ZERO_OBJECT(&config);
    config.decodedFormat     = ma_format_unknown;
    config.decodedChannels   = 0;
    config.decodedSampleRate = 0;
    config.jobThreadCount    = 1;   /* A single miniaudio-managed job thread by default. */

    return config;
}


MA_API ma_result ma_resource_manager_init(const ma_resource_manager_config* pConfig, ma_resource_manager* pResourceManager)
{
    ma_result result;
    ma_uint32 jobQueueFlags;
    ma_uint32 iJobThread;

    if (pResourceManager == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pResourceManager);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pConfig->jobThreadCount > ma_countof(pResourceManager->jobThreads)) {
        return MA_INVALID_ARGS; /* Requesting too many job threads. */
    }

    pResourceManager->config = *pConfig;
    ma_allocation_callbacks_init_copy(&pResourceManager->config.allocationCallbacks, &pConfig->allocationCallbacks);

    if (pResourceManager->config.pVFS == NULL) {
        result = ma_default_vfs_init(&pResourceManager->defaultVFS, &pResourceManager->config.allocationCallbacks);
        if (result != MA_SUCCESS) {
            return result;  /* Failed to initialize the default file system. */
        }

        pResourceManager->config.pVFS = &pResourceManager->defaultVFS;
    }

    /* Job queue. */
    jobQueueFlags = 0;
    if ((pConfig->flags & MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING) != 0) {
        if (pConfig->jobThreadCount > 0) {
            return MA_INVALID_ARGS; /* Non-blocking mode is only valid for self-managed job threads. */
        }

        jobQueueFlags |= MA_JOB_QUEUE_FLAG_NON_BLOCKING;
    }

    result = ma_job_queue_init(jobQueueFlags, &pResourceManager->jobQueue);
    if (result != MA_SUCCESS) {
        ma_mutex_uninit(&pResourceManager->dataBufferLock);
        return result;
    }


    /* Data buffer lock. */
    result = ma_mutex_init(&pResourceManager->dataBufferLock);
    if (result != MA_SUCCESS) {
        return result;
    }


    /* Create the job threads last to ensure the threads has access to valid data. */
    for (iJobThread = 0; iJobThread < pConfig->jobThreadCount; iJobThread += 1) {
        result = ma_thread_create(&pResourceManager->jobThreads[iJobThread], ma_thread_priority_normal, 0, ma_resource_manager_job_thread, pResourceManager);
        if (result != MA_SUCCESS) {
            ma_mutex_uninit(&pResourceManager->dataBufferLock);
            ma_job_queue_uninit(&pResourceManager->jobQueue);
            return result;
        }
    }

    return MA_SUCCESS;
}


static void ma_resource_manager_delete_all_data_buffer_nodes(ma_resource_manager* pResourceManager)
{
    MA_ASSERT(pResourceManager);

    /* If everything was done properly, there shouldn't be any active data buffers. */
    while (pResourceManager->pRootDataBufferNode != NULL) {
        ma_resource_manager_data_buffer_node* pDataBufferNode = pResourceManager->pRootDataBufferNode;
        ma_resource_manager_data_buffer_node_remove(pResourceManager, pDataBufferNode);

        /* The data buffer has been removed from the BST, so now we need to free it's data. */
        ma_resource_manager_data_buffer_node_free(pResourceManager, pDataBufferNode);
    }
}

MA_API void ma_resource_manager_uninit(ma_resource_manager* pResourceManager)
{
    ma_uint32 iJobThread;

    if (pResourceManager == NULL) {
        return;
    }

    /*
    Job threads need to be killed first. To do this we need to post a quit message to the message queue and then wait for the thread. The quit message will never be removed from the
    queue which means it will never not be returned after being encounted for the first time which means all threads will eventually receive it.
    */
    ma_resource_manager_post_job_quit(pResourceManager);

    /* Wait for every job to finish before continuing to ensure nothing is sill trying to access any of our objects below. */
    for (iJobThread = 0; iJobThread < pResourceManager->config.jobThreadCount; iJobThread += 1) {
        ma_thread_wait(&pResourceManager->jobThreads[iJobThread]);
    }

    /* At this point the thread should have returned and no other thread should be accessing our data. We can now delete all data buffers. */
    ma_resource_manager_delete_all_data_buffer_nodes(pResourceManager);

    /* The job queue is no longer needed. */
    ma_job_queue_uninit(&pResourceManager->jobQueue);

    /* We're no longer doing anything with data buffers so the lock can now be uninitialized. */
    ma_mutex_uninit(&pResourceManager->dataBufferLock);
}


static ma_result ma_resource_manager__init_decoder(ma_resource_manager* pResourceManager, const char* pFilePath, ma_decoder* pDecoder)
{
    ma_decoder_config config;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pFilePath        != NULL);
    MA_ASSERT(pDecoder         != NULL);

    config = ma_decoder_config_init(pResourceManager->config.decodedFormat, pResourceManager->config.decodedChannels, pResourceManager->config.decodedSampleRate);
    config.allocationCallbacks = pResourceManager->config.allocationCallbacks;

    return ma_decoder_init_vfs(pResourceManager->config.pVFS, pFilePath, &config, pDecoder);
}

static ma_result ma_resource_manager_data_buffer_init_connector(ma_resource_manager_data_buffer* pDataBuffer, ma_async_notification* pNotification)
{
    ma_result result;

    MA_ASSERT(pDataBuffer != NULL);

    /* The underlying data buffer must be initialized before we'll be able to know how to initialize the backend. */
    result = ma_resource_manager_data_buffer_result(pDataBuffer);
    if (result != MA_SUCCESS && result != MA_BUSY) {
        return result;  /* The data buffer is in an erroneous state. */
    }


    /*
    We need to initialize either a ma_decoder or an ma_audio_buffer depending on whether or not the backing data is encoded or decoded. These act as the
    "instance" to the data and are used to form the connection between underlying data buffer and the data source. If the data buffer is decoded, we can use
    an ma_audio_buffer. This enables us to use memory mapping when mixing which saves us a bit of data movement overhead.
    */
    if (pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_decoded) {
        pDataBuffer->connectorType = ma_resource_manager_data_buffer_connector_buffer;
    } else {
        pDataBuffer->connectorType = ma_resource_manager_data_buffer_connector_decoder;
    }

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_buffer) {
        ma_audio_buffer_config config;
        config = ma_audio_buffer_config_init(pDataBuffer->pNode->data.decoded.format, pDataBuffer->pNode->data.decoded.channels, pDataBuffer->pNode->data.decoded.frameCount, pDataBuffer->pNode->data.encoded.pData, NULL);
        result = ma_audio_buffer_init(&config, &pDataBuffer->connector.buffer);

        pDataBuffer->lengthInPCMFrames = pDataBuffer->connector.buffer.sizeInFrames;
    } else {
        ma_decoder_config configOut;
        configOut = ma_decoder_config_init(pDataBuffer->pResourceManager->config.decodedFormat, pDataBuffer->pResourceManager->config.decodedChannels, pDataBuffer->pResourceManager->config.decodedSampleRate);

        if (pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_decoded) {
            ma_decoder_config configIn;
            ma_uint64 sizeInBytes;

            configIn  = ma_decoder_config_init(pDataBuffer->pNode->data.decoded.format, pDataBuffer->pNode->data.decoded.channels, pDataBuffer->pNode->data.decoded.sampleRate);

            sizeInBytes = pDataBuffer->pNode->data.decoded.frameCount * ma_get_bytes_per_frame(configIn.format, configIn.channels);
            if (sizeInBytes > MA_SIZE_MAX) {
                result = MA_TOO_BIG;
            } else {
                result = ma_decoder_init_memory_raw(pDataBuffer->pNode->data.decoded.pData, (size_t)sizeInBytes, &configIn, &configOut, &pDataBuffer->connector.decoder);  /* Safe cast thanks to the check above. */
            }

            /*
            We will know the length for decoded sounds. Don't use ma_decoder_get_length_in_pcm_frames() as it may return 0 for sounds where the length
            is not known until it has been fully decoded which we've just done at a higher level.
            */
            pDataBuffer->lengthInPCMFrames = pDataBuffer->pNode->data.decoded.frameCount;
        } else {
            configOut.allocationCallbacks = pDataBuffer->pResourceManager->config.allocationCallbacks;
            result = ma_decoder_init_memory(pDataBuffer->pNode->data.encoded.pData, pDataBuffer->pNode->data.encoded.sizeInBytes, &configOut, &pDataBuffer->connector.decoder);

            /* Our only option is to use ma_decoder_get_length_in_pcm_frames() when loading from an encoded data source. */
            pDataBuffer->lengthInPCMFrames = ma_decoder_get_length_in_pcm_frames(&pDataBuffer->connector.decoder);
        }
    }

    /*
    We can only do mapping if the data source's backend is an audio buffer. If it's not, clear out the callbacks thereby preventing the mixer from attempting
    memory map mode, only to fail.
    */
    if (pDataBuffer->connectorType != ma_resource_manager_data_buffer_connector_buffer) {
        pDataBuffer->ds.onMap   = NULL;
        pDataBuffer->ds.onUnmap = NULL;
    }

    /*
    Initialization of the connector is when we can fire the MA_NOTIFICATION_COMPLETE notification. This will give the application access to
    the format/channels/rate of the data source.
    */
    if (result == MA_SUCCESS) {
        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
        }
    }
    
    /* At this point the backend should be initialized. We do *not* want to set pDataSource->result here - that needs to be done at a higher level to ensure it's done as the last step. */
    return result;
}

static ma_result ma_resource_manager_data_buffer_uninit_connector(ma_resource_manager* pResourceManager, ma_resource_manager_data_buffer* pDataBuffer)
{
    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pDataBuffer      != NULL);

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_decoder) {
        ma_decoder_uninit(&pDataBuffer->connector.decoder);
    } else {
        ma_audio_buffer_uninit(&pDataBuffer->connector.buffer);
    }

    return MA_SUCCESS;
}

static ma_uint32 ma_resource_manager_data_buffer_next_execution_order(ma_resource_manager_data_buffer* pDataBuffer)
{
    MA_ASSERT(pDataBuffer != NULL);
    return c89atomic_fetch_add_32(&pDataBuffer->pNode->executionCounter, 1);
}

static ma_bool32 ma_resource_manager_data_buffer_is_busy(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64 requiredFrameCount)
{
    /*
    Here is where we determine whether or not we need to return MA_BUSY from a data source callback. If we don't have enough data loaded to output all requiredFrameCount frames
    we will abort with MA_BUSY. We could also choose to do a partial read (only reading as many frames are available), but it's just easier to abort early and I don't think it
    really makes much practical difference. This only applies to decoded buffers.
    */
    if (pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_decoded) {
        ma_uint64 availableFrames;

        /* If the sound has been fully loaded then we'll never be busy. */
        if (pDataBuffer->pNode->data.decoded.decodedFrameCount == pDataBuffer->pNode->data.decoded.frameCount) {
            return MA_FALSE;    /* The sound is fully loaded. The buffer will never be busy. */
        }

        if (ma_resource_manager_data_buffer_get_available_frames(pDataBuffer, &availableFrames) == MA_SUCCESS) {
            return availableFrames < requiredFrameCount;
        }
    }

    return MA_FALSE;
}

static ma_data_source* ma_resource_manager_data_buffer_get_connector(ma_resource_manager_data_buffer* pDataBuffer)
{
    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_buffer) {
        return &pDataBuffer->connector.buffer;
    } else {
        return &pDataBuffer->connector.decoder;
    }
}


static ma_result ma_resource_manager_data_buffer_cb__read_pcm_frames(ma_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
    return ma_resource_manager_data_buffer_read_pcm_frames((ma_resource_manager_data_buffer*)pDataSource, pFramesOut, frameCount, pFramesRead);
}

static ma_result ma_resource_manager_data_buffer_cb__seek_to_pcm_frame(ma_data_source* pDataSource, ma_uint64 frameIndex)
{
    return ma_resource_manager_data_buffer_seek_to_pcm_frame((ma_resource_manager_data_buffer*)pDataSource, frameIndex);
}

static ma_result ma_resource_manager_data_buffer_cb__map(ma_data_source* pDataSource, void** ppFramesOut, ma_uint64* pFrameCount)
{
    return ma_resource_manager_data_buffer_map((ma_resource_manager_data_buffer*)pDataSource, ppFramesOut, pFrameCount);
}

static ma_result ma_resource_manager_data_buffer_cb__unmap(ma_data_source* pDataSource, ma_uint64 frameCount)
{
    return ma_resource_manager_data_buffer_unmap((ma_resource_manager_data_buffer*)pDataSource, frameCount);
}

static ma_result ma_resource_manager_data_buffer_cb__get_data_format(ma_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    return ma_resource_manager_data_buffer_get_data_format((ma_resource_manager_data_buffer*)pDataSource, pFormat, pChannels, pSampleRate);
}

static ma_result ma_resource_manager_data_buffer_cb__get_cursor_in_pcm_frames(ma_data_source* pDataSource, ma_uint64* pCursor)
{
    return ma_resource_manager_data_buffer_get_cursor_in_pcm_frames((ma_resource_manager_data_buffer*)pDataSource, pCursor);
}

static ma_result ma_resource_manager_data_buffer_cb__get_length_in_pcm_frames(ma_data_source* pDataSource, ma_uint64* pLength)
{
    return ma_resource_manager_data_buffer_get_length_in_pcm_frames((ma_resource_manager_data_buffer*)pDataSource, pLength);
}

static ma_result ma_resource_manager_data_buffer_init_nolock(ma_resource_manager* pResourceManager, const char* pFilePath, ma_uint32 hashedName32, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_buffer* pDataBuffer)
{
    ma_result result;
    ma_resource_manager_data_buffer_node* pInsertPoint;
    char* pFilePathCopy;    /* Allocated here, freed in the job thread. */
    ma_resource_manager_data_buffer_encoding dataBufferType;
    ma_bool32 async;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pFilePath        != NULL);
    MA_ASSERT(pDataBuffer      != NULL);

    MA_ZERO_OBJECT(pDataBuffer);
    pDataBuffer->ds.onRead          = ma_resource_manager_data_buffer_cb__read_pcm_frames;
    pDataBuffer->ds.onSeek          = ma_resource_manager_data_buffer_cb__seek_to_pcm_frame;
    pDataBuffer->ds.onMap           = ma_resource_manager_data_buffer_cb__map;
    pDataBuffer->ds.onUnmap         = ma_resource_manager_data_buffer_cb__unmap;
    pDataBuffer->ds.onGetDataFormat = ma_resource_manager_data_buffer_cb__get_data_format;
    pDataBuffer->ds.onGetCursor     = ma_resource_manager_data_buffer_cb__get_cursor_in_pcm_frames;
    pDataBuffer->ds.onGetLength     = ma_resource_manager_data_buffer_cb__get_length_in_pcm_frames;

    pDataBuffer->pResourceManager   = pResourceManager;
    pDataBuffer->flags              = flags;

    /* The backend type hasn't been determined yet - that happens when it's initialized properly by the job thread. */
    pDataBuffer->connectorType = ma_resource_manager_data_buffer_connector_unknown;

    /* The encoding of the data buffer is taken from the flags. */
    if ((flags & MA_DATA_SOURCE_FLAG_DECODE) != 0) {
        dataBufferType = ma_resource_manager_data_buffer_encoding_decoded;
    } else {
        dataBufferType = ma_resource_manager_data_buffer_encoding_encoded;
    }

    /* The data buffer needs to be loaded by the calling thread if we're in synchronous mode. */
    async = (flags & MA_DATA_SOURCE_FLAG_ASYNC) != 0;

    /*
    The first thing to do is find the insertion point. If it's already loaded it means we can just increment the reference counter and signal the event. Otherwise we
    need to do a full load.
    */
    result = ma_resource_manager_data_buffer_node_insert_point(pResourceManager, hashedName32, &pInsertPoint);
    if (result == MA_ALREADY_EXISTS) {
        /* Fast path. The data buffer already exists. We just need to increment the reference counter and signal the event, if any. */
        pDataBuffer->pNode = pInsertPoint;

        result = ma_resource_manager_data_buffer_node_increment_ref(pResourceManager, pDataBuffer->pNode, NULL);
        if (result != MA_SUCCESS) {
            return result;  /* Should never happen. Failed to increment the reference count. */
        }

        /* The existing node may be in the middle of loading. We need to wait for the node to finish loading before going any further. */
        /* TODO: This needs to be improved so that when loading asynchronously we post a message to the job queue instead of just waiting. */
        while (ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) == MA_BUSY) {
            ma_yield();
        }

        result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pNotification);
        if (result != MA_SUCCESS) {
            ma_resource_manager_data_buffer_node_free(pDataBuffer->pResourceManager, pDataBuffer->pNode);
            return result;
        }

        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
        }
    } else {
        /* Slow path. The data for this buffer has not yet been initialized. The first thing to do is allocate the new data buffer and insert it into the BST. */
        pDataBuffer->pNode = (ma_resource_manager_data_buffer_node*)ma__malloc_from_callbacks(sizeof(*pDataBuffer->pNode), &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
        if (pDataBuffer->pNode == NULL) {
            return MA_OUT_OF_MEMORY;
        }

        MA_ZERO_OBJECT(pDataBuffer->pNode);
        pDataBuffer->pNode->hashedName32 = hashedName32;
        pDataBuffer->pNode->refCount     = 1;        /* Always set to 1 by default (this is our first reference). */
        pDataBuffer->pNode->data.type    = dataBufferType;
        pDataBuffer->pNode->result       = MA_BUSY;  /* I think it's good practice to set the status to MA_BUSY by default. */

        result = ma_resource_manager_data_buffer_node_insert_at(pResourceManager, pDataBuffer->pNode, pInsertPoint);
        if (result != MA_SUCCESS) {
            return result;  /* Should never happen. Failed to insert the data buffer into the BST. */
        }

        /*
        The new data buffer has been inserted into the BST. We now need to load the data. If we are loading synchronously we need to load
        everything from the calling thread because we may be in a situation where there are no job threads running and therefore the data
        will never get loaded. If we are loading asynchronously, we can assume at least one job thread exists and we can do everything
        from there.
        */
        pDataBuffer->pNode->isDataOwnedByResourceManager = MA_TRUE;
        pDataBuffer->pNode->result = MA_BUSY;

        if (async) {
            /* Asynchronous. Post to the job thread. */
            ma_job job;
            ma_bool32 waitInit = MA_FALSE;
            ma_async_notification_event initNotification;

            /* We need a copy of the file path. We should probably make this more efficient, but for now we'll do a transient memory allocation. */
            pFilePathCopy = ma_copy_string(pFilePath, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);
            if (pFilePathCopy == NULL) {
                if (pNotification != NULL) {
                    ma_async_notification_signal(pNotification, MA_NOTIFICATION_FAILED);
                }

                ma_resource_manager_data_buffer_node_remove(pResourceManager, pDataBuffer->pNode);
                ma__free_from_callbacks(pDataBuffer->pNode, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
                return MA_OUT_OF_MEMORY;
            }

            if ((flags & MA_DATA_SOURCE_FLAG_WAIT_INIT) != 0) {
                waitInit = MA_TRUE;
                ma_async_notification_event_init(&initNotification);
            }

            /* We now have everything we need to post the job to the job thread. */
            job = ma_job_init(MA_JOB_LOAD_DATA_BUFFER);
            job.order = ma_resource_manager_data_buffer_next_execution_order(pDataBuffer);
            job.loadDataBuffer.pDataBuffer            = pDataBuffer;
            job.loadDataBuffer.pFilePath              = pFilePathCopy;
            job.loadDataBuffer.pInitNotification      = (waitInit == MA_TRUE) ? &initNotification : NULL;
            job.loadDataBuffer.pCompletedNotification = pNotification;
            result = ma_resource_manager_post_job(pResourceManager, &job);
            if (result != MA_SUCCESS) {
                /* Failed to post the job to the queue. Probably ran out of space. */
                if (pNotification != NULL) {
                    ma_async_notification_signal(pNotification, MA_NOTIFICATION_FAILED);
                }

                if (waitInit == MA_TRUE) {
                    ma_async_notification_event_uninit(&initNotification);
                }

                ma_resource_manager_data_buffer_node_remove(pResourceManager, pDataBuffer->pNode);
                ma__free_from_callbacks(pDataBuffer->pNode, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
                ma__free_from_callbacks(pFilePathCopy,      &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);
                return result;
            }

            /* If we're waiting for initialization of the connector, do so here before returning. */
            if (waitInit == MA_TRUE) {
                ma_async_notification_event_wait(&initNotification);
                ma_async_notification_event_uninit(&initNotification);
            }
        } else {
            /* Synchronous. Do everything here. */
            if (pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_encoded) {
                /* No decoding. Just store the file contents in memory. */
                void* pData;
                size_t sizeInBytes;
                result = ma_vfs_open_and_read_file_ex(pResourceManager->config.pVFS, pFilePath, &pData, &sizeInBytes, &pResourceManager->config.allocationCallbacks, MA_ALLOCATION_TYPE_ENCODED_BUFFER);
                if (result == MA_SUCCESS) {
                    pDataBuffer->pNode->data.encoded.pData       = pData;
                    pDataBuffer->pNode->data.encoded.sizeInBytes = sizeInBytes;
                }
            } else  {
                /* Decoding. */
                ma_decoder decoder;

                result = ma_resource_manager__init_decoder(pResourceManager, pFilePath, &decoder);
                if (result == MA_SUCCESS) {
                    ma_uint64 totalFrameCount;
                    ma_uint64 dataSizeInBytes;
                    void* pData = NULL;

                    pDataBuffer->pNode->data.decoded.format     = decoder.outputFormat;
                    pDataBuffer->pNode->data.decoded.channels   = decoder.outputChannels;
                    pDataBuffer->pNode->data.decoded.sampleRate = decoder.outputSampleRate;

                    totalFrameCount = ma_decoder_get_length_in_pcm_frames(&decoder);
                    if (totalFrameCount > 0) {
                        /* It's a known length. We can use an optimized allocation strategy in this case. */
                        dataSizeInBytes = totalFrameCount * ma_get_bytes_per_frame(decoder.outputFormat, decoder.outputChannels);
                        if (dataSizeInBytes <= MA_SIZE_MAX) {
                            pData = ma__malloc_from_callbacks((size_t)dataSizeInBytes, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
                            if (pData != NULL) {
                                totalFrameCount = ma_decoder_read_pcm_frames(&decoder, pData, totalFrameCount);
                            } else {
                                result = MA_OUT_OF_MEMORY;
                            }
                        } else {
                            result = MA_TOO_BIG;
                        }
                    } else {
                        /* It's an unknown length. We need to dynamically expand the buffer as we decode. To start with we allocate space for one page. We'll then double it as we need more space. */
                        ma_uint64 bytesPerFrame;
                        ma_uint64 pageSizeInFrames;
                        ma_uint64 dataSizeInFrames;
                            
                        bytesPerFrame    = ma_get_bytes_per_frame(decoder.outputFormat, decoder.outputChannels);
                        pageSizeInFrames = MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS * (decoder.outputSampleRate/1000);
                        dataSizeInFrames = 0;

                        /* Keep loading, page-by-page. */
                        for (;;) {
                            ma_uint64 framesRead;

                            /* Expand the buffer if need be. */
                            if (totalFrameCount + pageSizeInFrames > dataSizeInFrames) {                                    
                                ma_uint64 oldDataSizeInFrames;
                                ma_uint64 oldDataSizeInBytes;
                                ma_uint64 newDataSizeInFrames;
                                ma_uint64 newDataSizeInBytes;
                                void* pNewData;

                                oldDataSizeInFrames = (dataSizeInFrames);
                                newDataSizeInFrames = (dataSizeInFrames == 0) ? pageSizeInFrames : dataSizeInFrames * 2;

                                oldDataSizeInBytes = bytesPerFrame * oldDataSizeInFrames;
                                newDataSizeInBytes = bytesPerFrame * newDataSizeInFrames;

                                if (newDataSizeInBytes > MA_SIZE_MAX) {
                                    result = MA_TOO_BIG;
                                    break;
                                }

                                pNewData = ma__realloc_from_callbacks(pData, (size_t)newDataSizeInBytes, (size_t)oldDataSizeInBytes, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
                                if (pNewData == NULL) {
                                    ma__free_from_callbacks(pData, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
                                    result = MA_OUT_OF_MEMORY;
                                    break;
                                }

                                pData            = pNewData;
                                dataSizeInFrames = newDataSizeInFrames;
                            }

                            framesRead = ma_decoder_read_pcm_frames(&decoder, ma_offset_ptr(pData, bytesPerFrame * totalFrameCount), pageSizeInFrames);
                            totalFrameCount += framesRead;

                            if (framesRead < pageSizeInFrames) {
                                /* We've reached the end. As we were loading we were doubling the size of the buffer each time we needed more memory. Let's try reducing this by doing a final realloc(). */
                                size_t newDataSizeInBytes = (size_t)(totalFrameCount  * bytesPerFrame);
                                size_t oldDataSizeInBytes = (size_t)(dataSizeInFrames * bytesPerFrame);
                                void* pNewData = ma__realloc_from_callbacks(pData, newDataSizeInBytes, oldDataSizeInBytes, &pResourceManager->config.allocationCallbacks);
                                if (pNewData != NULL) {
                                    pData = pNewData;
                                }

                                /* We're done, so get out of the loop. */
                                break;
                            }
                        }
                    }

                    if (result == MA_SUCCESS) {
                        pDataBuffer->pNode->data.decoded.pData             = pData;
                        pDataBuffer->pNode->data.decoded.frameCount        = totalFrameCount;
                        pDataBuffer->pNode->data.decoded.decodedFrameCount = totalFrameCount;  /* We've decoded everything. */
                    } else {
                        pDataBuffer->pNode->data.decoded.pData             = NULL;
                        pDataBuffer->pNode->data.decoded.frameCount        = 0;
                        pDataBuffer->pNode->data.decoded.decodedFrameCount = 0;
                    }

                    ma_decoder_uninit(&decoder);
                }
            }

            /* When loading synchronously we need to initialize the connector straight away. */
            if (result == MA_SUCCESS) {
                result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pNotification);
            }

            pDataBuffer->pNode->result = result;
        }

        /* If we failed to initialize make sure we fire the event and free memory. */
        if (result != MA_SUCCESS) {
            if (pNotification != NULL) {
                ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
            }

            ma_resource_manager_data_buffer_node_remove(pResourceManager, pDataBuffer->pNode);
            ma__free_from_callbacks(pDataBuffer->pNode, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
            return result;
        }

        /* We'll need to fire the event if we have one in synchronous mode. */
        if (async == MA_FALSE) {
            if (pNotification != NULL) {
                ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
            }
        }
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_init(ma_resource_manager* pResourceManager, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_buffer* pDataBuffer)
{
    ma_result result;
    ma_uint32 hashedName32;

    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pResourceManager == NULL || pFilePath == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Do as much set up before entering into the critical section to reduce our lock time as much as possible. */
    hashedName32 = ma_hash_string_32(pFilePath);

    /* At this point we can now enter the critical section. */
    ma_mutex_lock(&pResourceManager->dataBufferLock);
    {
        result = ma_resource_manager_data_buffer_init_nolock(pResourceManager, pFilePath, hashedName32, flags, pNotification, pDataBuffer);
    }
    ma_mutex_unlock(&pResourceManager->dataBufferLock);

    return result;
}

static ma_result ma_resource_manager_data_buffer_uninit_internal(ma_resource_manager_data_buffer* pDataBuffer)
{
    MA_ASSERT(pDataBuffer != NULL);

    /* The connector should be uninitialized first. */
    ma_resource_manager_data_buffer_uninit_connector(pDataBuffer->pResourceManager, pDataBuffer);
    pDataBuffer->connectorType = ma_resource_manager_data_buffer_connector_unknown;

    /* Free the node last. */
    ma_resource_manager_data_buffer_node_free(pDataBuffer->pResourceManager, pDataBuffer->pNode);

    return MA_SUCCESS;
}

static ma_result ma_resource_manager_data_buffer_uninit_nolock(ma_resource_manager_data_buffer* pDataBuffer)
{
    ma_uint32 result;
    ma_uint32 refCount;

    MA_ASSERT(pDataBuffer != NULL);

    result = ma_resource_manager_data_buffer_node_decrement_ref(pDataBuffer->pResourceManager, pDataBuffer->pNode, &refCount);
    if (result != MA_SUCCESS) {
        return result;
    }

    /* If the reference count has hit zero it means we need to delete the data buffer and it's backing data (so long as it's owned by the resource manager). */
    if (refCount == 0) {
        ma_bool32 asyncUninit = MA_TRUE;

        result = ma_resource_manager_data_buffer_node_remove(pDataBuffer->pResourceManager, pDataBuffer->pNode);
        if (result != MA_SUCCESS) {
            return result;  /* An error occurred when trying to remove the data buffer. This should never happen. */
        }

        if (ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) == MA_SUCCESS) {
            asyncUninit = MA_FALSE;
        }

        /*
        The data buffer has been removed from the BST so now we need to delete the underyling data. This needs to be done in a separate thread. We don't
        want to delete anything if the data is owned by the application. Also, just to be safe, we set the result to MA_UNAVAILABLE.
        */
        c89atomic_exchange_i32(&pDataBuffer->pNode->result, MA_UNAVAILABLE);

        if (asyncUninit == MA_FALSE) {
            /* The data buffer can be deleted synchronously. */
            return ma_resource_manager_data_buffer_uninit_internal(pDataBuffer);
        } else {
            /*
            The data buffer needs to be deleted asynchronously because it's still loading. With the status set to MA_UNAVAILABLE, no more pages will
            be loaded and the uninitialization should happen fairly quickly. Since the caller owns the data buffer, we need to wait for this event
            to get processed before returning.
            */
            ma_async_notification_event waitEvent;
            ma_job job;

            result = ma_async_notification_event_init(&waitEvent);
            if (result != MA_SUCCESS) {
                return result;  /* Failed to create the wait event. This should rarely if ever happen. */
            }

            job = ma_job_init(MA_JOB_FREE_DATA_BUFFER);
            job.order = ma_resource_manager_data_buffer_next_execution_order(pDataBuffer);
            job.freeDataBuffer.pDataBuffer   = pDataBuffer;
            job.freeDataBuffer.pNotification = &waitEvent;

            result = ma_resource_manager_post_job(pDataBuffer->pResourceManager, &job);
            if (result != MA_SUCCESS) {
                ma_async_notification_event_uninit(&waitEvent);
                return result;
            }

            ma_async_notification_event_wait(&waitEvent);
            ma_async_notification_event_uninit(&waitEvent);
        }
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_uninit(ma_resource_manager_data_buffer* pDataBuffer)
{
    ma_result result;

    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    ma_mutex_lock(&pDataBuffer->pResourceManager->dataBufferLock);
    {
        result = ma_resource_manager_data_buffer_uninit_nolock(pDataBuffer);
    }
    ma_mutex_unlock(&pDataBuffer->pResourceManager->dataBufferLock);

    return result;
}

MA_API ma_result ma_resource_manager_data_buffer_read_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
    ma_result result;
    ma_uint64 framesRead;
    ma_bool32 isLooping;
    ma_bool32 skipBusyCheck = MA_FALSE;

    /* Safety. */
    if (pFramesRead != NULL) {
        *pFramesRead = 0;
    }

    /*
    We cannot be using the data buffer after it's been uninitialized. If you trigger this assert it means you're trying to read from the data buffer after
    it's been uninitialized or is in the process of uninitializing.
    */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    /* If we haven't yet got a connector we need to abort. */
    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        return MA_BUSY; /* Still loading. */
    }

    if (pDataBuffer->seekToCursorOnNextRead) {
        pDataBuffer->seekToCursorOnNextRead = MA_FALSE;

        result = ma_data_source_seek_to_pcm_frame(ma_resource_manager_data_buffer_get_connector(pDataBuffer), pDataBuffer->cursorInPCMFrames);
        if (result != MA_SUCCESS) {
            return result;
        }
    }

    if (skipBusyCheck == MA_FALSE) {
        if (ma_resource_manager_data_buffer_is_busy(pDataBuffer, frameCount)) {
            return MA_BUSY;
        }
    }

    result = ma_resource_manager_data_buffer_get_looping(pDataBuffer, &isLooping);
    if (result != MA_SUCCESS) {
        return result;
    }

    result = ma_data_source_read_pcm_frames(ma_resource_manager_data_buffer_get_connector(pDataBuffer), pFramesOut, frameCount, &framesRead, isLooping);
    pDataBuffer->cursorInPCMFrames += framesRead;

    if (pFramesRead != NULL) {
        *pFramesRead = framesRead;
    }

    return result;
}

MA_API ma_result ma_resource_manager_data_buffer_seek_to_pcm_frame(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64 frameIndex)
{
    ma_result result;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    /* If we haven't yet got a connector we need to abort. */
    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        pDataBuffer->cursorInPCMFrames = frameIndex;
        pDataBuffer->seekToCursorOnNextRead = MA_TRUE;
        return MA_BUSY; /* Still loading. */
    }

    result = ma_data_source_seek_to_pcm_frame(ma_resource_manager_data_buffer_get_connector(pDataBuffer), frameIndex);
    if (result != MA_SUCCESS) {
        return result;
    }

    pDataBuffer->cursorInPCMFrames = frameIndex;
    pDataBuffer->seekToCursorOnNextRead = MA_FALSE;

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_map(ma_resource_manager_data_buffer* pDataBuffer, void** ppFramesOut, ma_uint64* pFrameCount)
{
    ma_result result;
    ma_bool32 skipBusyCheck = MA_FALSE;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    /* If we haven't yet got a connector we need to abort. */
    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        return MA_BUSY; /* Still loading. */
    }

    if (pDataBuffer->seekToCursorOnNextRead) {
        pDataBuffer->seekToCursorOnNextRead = MA_FALSE;

        result = ma_data_source_seek_to_pcm_frame(ma_resource_manager_data_buffer_get_connector(pDataBuffer), pDataBuffer->cursorInPCMFrames);
        if (result != MA_SUCCESS) {
            return result;
        }
    }

    if (skipBusyCheck == MA_FALSE) {
        if (ma_resource_manager_data_buffer_is_busy(pDataBuffer, *pFrameCount)) {
            return MA_BUSY;
        }
    }

    /* The frame cursor is incremented in unmap(). */
    return ma_data_source_map(ma_resource_manager_data_buffer_get_connector(pDataBuffer), ppFramesOut, pFrameCount);
}

MA_API ma_result ma_resource_manager_data_buffer_unmap(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64 frameCount)
{
    ma_result result;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    result = ma_data_source_unmap(ma_resource_manager_data_buffer_get_connector(pDataBuffer), frameCount);
    if (result == MA_SUCCESS) {
        pDataBuffer->cursorInPCMFrames += frameCount;
    }

    return result;
}

MA_API ma_result ma_resource_manager_data_buffer_get_data_format(ma_resource_manager_data_buffer* pDataBuffer, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    /* If we haven't yet got a connector we need to abort. */
    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        return MA_BUSY; /* Still loading. */
    }

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_buffer) {
        MA_ASSERT(pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_decoded);

        *pFormat     = pDataBuffer->pNode->data.decoded.format;
        *pChannels   = pDataBuffer->pNode->data.decoded.channels;
        *pSampleRate = pDataBuffer->pNode->data.decoded.sampleRate;

        return MA_SUCCESS;
    } else {
        return ma_data_source_get_data_format(&pDataBuffer->connector.decoder, pFormat, pChannels, pSampleRate);
    }
}

MA_API ma_result ma_resource_manager_data_buffer_get_cursor_in_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pCursor)
{
    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    if (pDataBuffer == NULL || pCursor == NULL) {
        return MA_INVALID_ARGS;
    }

    *pCursor = pDataBuffer->cursorInPCMFrames;

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_get_length_in_pcm_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pLength)
{
    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_UNAVAILABLE);

    if (pDataBuffer == NULL || pLength == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        return MA_BUSY; /* Still loading. */
    }

    *pLength = pDataBuffer->lengthInPCMFrames;
    if (*pLength == 0) {
        return MA_NOT_IMPLEMENTED;
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_result(const ma_resource_manager_data_buffer* pDataBuffer)
{
    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode);
}

MA_API ma_result ma_resource_manager_data_buffer_set_looping(ma_resource_manager_data_buffer* pDataBuffer, ma_bool32 isLooping)
{
    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_32(&pDataBuffer->isLooping, isLooping);

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_get_looping(const ma_resource_manager_data_buffer* pDataBuffer, ma_bool32* pIsLooping)
{
    if (pIsLooping == NULL) {
        return MA_INVALID_ARGS;
    }

    *pIsLooping = MA_FALSE;

    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    *pIsLooping = c89atomic_load_32((ma_bool32*)&pDataBuffer->isLooping);

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_buffer_get_available_frames(ma_resource_manager_data_buffer* pDataBuffer, ma_uint64* pAvailableFrames)
{
    if (pAvailableFrames == NULL) {
        return MA_INVALID_ARGS;
    }

    *pAvailableFrames = 0;

    if (pDataBuffer == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_unknown) {
        if (ma_resource_manager_data_buffer_result(pDataBuffer) == MA_BUSY) {
            return MA_BUSY;
        } else {
            return MA_INVALID_OPERATION;    /* No connector. */
        }
    }

    if (pDataBuffer->connectorType == ma_resource_manager_data_buffer_connector_buffer) {
        /* Retrieve the available frames based on how many frames we've currently decoded, and *not* the total capacity of the audio buffer. */
        if (pDataBuffer->pNode->data.decoded.decodedFrameCount > pDataBuffer->cursorInPCMFrames) {
            *pAvailableFrames = pDataBuffer->pNode->data.decoded.decodedFrameCount - pDataBuffer->cursorInPCMFrames;
        } else {
            *pAvailableFrames = 0;
        }

        return MA_SUCCESS;
    } else {
        return ma_decoder_get_available_frames(&pDataBuffer->connector.decoder, pAvailableFrames);
    }
}


static ma_result ma_resource_manager_register_data_nolock(ma_resource_manager* pResourceManager, ma_uint32 hashedName32, ma_resource_manager_data_buffer_encoding type, ma_resource_manager_memory_buffer* pExistingData)
{
    ma_result result;
    ma_resource_manager_data_buffer_node* pInsertPoint;
    ma_resource_manager_data_buffer_node* pNode;

    result = ma_resource_manager_data_buffer_node_insert_point(pResourceManager, hashedName32, &pInsertPoint);
    if (result == MA_ALREADY_EXISTS) {
        /* Fast path. The data buffer already exists. We just need to increment the reference counter and signal the event, if any. */
        pNode = pInsertPoint;

        result = ma_resource_manager_data_buffer_node_increment_ref(pResourceManager, pNode, NULL);
        if (result != MA_SUCCESS) {
            return result;  /* Should never happen. Failed to increment the reference count. */
        }
    } else {
        /* Slow path. The data for this buffer has not yet been initialized. The first thing to do is allocate the new data buffer and insert it into the BST. */
        pNode = (ma_resource_manager_data_buffer_node*)ma__malloc_from_callbacks(sizeof(*pNode), &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_RESOURCE_MANAGER_DATA_BUFFER*/);
        if (pNode == NULL) {
            return MA_OUT_OF_MEMORY;
        }

        MA_ZERO_OBJECT(pNode);
        pNode->hashedName32 = hashedName32;
        pNode->refCount     = 1;        /* Always set to 1 by default (this is our first reference). */
        pNode->data.type    = type;
        pNode->result       = MA_SUCCESS;

        result = ma_resource_manager_data_buffer_node_insert_at(pResourceManager, pNode, pInsertPoint);
        if (result != MA_SUCCESS) {
            return result;  /* Should never happen. Failed to insert the data buffer into the BST. */
        }

        pNode->isDataOwnedByResourceManager = MA_FALSE;
        pNode->data = *pExistingData;
    }

    return MA_SUCCESS;
}

static ma_result ma_resource_manager_register_data(ma_resource_manager* pResourceManager, const char* pName, ma_resource_manager_data_buffer_encoding type, ma_resource_manager_memory_buffer* pExistingData)
{
    ma_result result = MA_SUCCESS;
    ma_uint32 hashedName32;

    if (pResourceManager == NULL || pName == NULL) {
        return MA_INVALID_ARGS;
    }

    hashedName32 = ma_hash_string_32(pName);

    ma_mutex_lock(&pResourceManager->dataBufferLock);
    {
        result = ma_resource_manager_register_data_nolock(pResourceManager, hashedName32, type, pExistingData);
    }
    ma_mutex_unlock(&pResourceManager->dataBufferLock);

    return result;
}

MA_API ma_result ma_resource_manager_register_decoded_data(ma_resource_manager* pResourceManager, const char* pName, const void* pData, ma_uint64 frameCount, ma_format format, ma_uint32 channels, ma_uint32 sampleRate)
{
    ma_resource_manager_memory_buffer data;
    data.type               = ma_resource_manager_data_buffer_encoding_decoded;
    data.decoded.pData      = pData;
    data.decoded.frameCount = frameCount;
    data.decoded.format     = format;
    data.decoded.channels   = channels;
    data.decoded.sampleRate = sampleRate;

    return ma_resource_manager_register_data(pResourceManager, pName, data.type, &data);
}

MA_API ma_result ma_resource_manager_register_encoded_data(ma_resource_manager* pResourceManager, const char* pName, const void* pData, size_t sizeInBytes)
{
    ma_resource_manager_memory_buffer data;
    data.type                = ma_resource_manager_data_buffer_encoding_encoded;
    data.encoded.pData       = pData;
    data.encoded.sizeInBytes = sizeInBytes;

    return ma_resource_manager_register_data(pResourceManager, pName, data.type, &data);
}


static ma_result ma_resource_manager_unregister_data_nolock(ma_resource_manager* pResourceManager, ma_uint32 hashedName32)
{
    ma_result result;
    ma_resource_manager_data_buffer_node* pDataBufferNode;
    ma_uint32 refCount;

    result = ma_resource_manager_data_buffer_node_search(pResourceManager, hashedName32, &pDataBufferNode);
    if (result != MA_SUCCESS) {
        return result;  /* Couldn't find the node. */
    }

    result = ma_resource_manager_data_buffer_node_decrement_ref(pResourceManager, pDataBufferNode, &refCount);
    if (result != MA_SUCCESS) {
        return result;
    }

    /* If the reference count has hit zero it means we can remove it from the BST. */
    if (refCount == 0) {
        result = ma_resource_manager_data_buffer_node_remove(pResourceManager, pDataBufferNode);
        if (result != MA_SUCCESS) {
            return result;  /* An error occurred when trying to remove the data buffer. This should never happen. */
        }
    }

    /* Finally we need to free the node. */
    ma_resource_manager_data_buffer_node_free(pResourceManager, pDataBufferNode);

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_unregister_data(ma_resource_manager* pResourceManager, const char* pName)
{
    ma_result result;
    ma_uint32 hashedName32;

    if (pResourceManager == NULL || pName == NULL) {
        return MA_INVALID_ARGS;
    }

    hashedName32 = ma_hash_string_32(pName);

    /*
    It's assumed that the data specified by pName was registered with a prior call to ma_resource_manager_register_encoded/decoded_data(). To unregister it, all
    we need to do is delete the data buffer by it's name.
    */
    ma_mutex_lock(&pResourceManager->dataBufferLock);
    {
        result = ma_resource_manager_unregister_data_nolock(pResourceManager, hashedName32);
    }
    ma_mutex_unlock(&pResourceManager->dataBufferLock);

    return result;
}


static ma_uint32 ma_resource_manager_data_stream_next_execution_order(ma_resource_manager_data_stream* pDataStream)
{
    MA_ASSERT(pDataStream != NULL);
    return c89atomic_fetch_add_32(&pDataStream->executionCounter, 1);
}

static ma_bool32 ma_resource_manager_data_stream_is_decoder_at_end(const ma_resource_manager_data_stream* pDataStream)
{
    MA_ASSERT(pDataStream != NULL);
    return c89atomic_load_32((ma_bool32*)&pDataStream->isDecoderAtEnd);
}

static ma_uint32 ma_resource_manager_data_stream_seek_counter(const ma_resource_manager_data_stream* pDataStream)
{
    MA_ASSERT(pDataStream != NULL);
    return c89atomic_load_32((ma_uint32*)&pDataStream->seekCounter);
}


static ma_result ma_resource_manager_data_stream_cb__read_pcm_frames(ma_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
    return ma_resource_manager_data_stream_read_pcm_frames((ma_resource_manager_data_stream*)pDataSource, pFramesOut, frameCount, pFramesRead);
}

static ma_result ma_resource_manager_data_stream_cb__seek_to_pcm_frame(ma_data_source* pDataSource, ma_uint64 frameIndex)
{
    return ma_resource_manager_data_stream_seek_to_pcm_frame((ma_resource_manager_data_stream*)pDataSource, frameIndex);
}

static ma_result ma_resource_manager_data_stream_cb__map(ma_data_source* pDataSource, void** ppFramesOut, ma_uint64* pFrameCount)
{
    return ma_resource_manager_data_stream_map((ma_resource_manager_data_stream*)pDataSource, ppFramesOut, pFrameCount);
}

static ma_result ma_resource_manager_data_stream_cb__unmap(ma_data_source* pDataSource, ma_uint64 frameCount)
{
    return ma_resource_manager_data_stream_unmap((ma_resource_manager_data_stream*)pDataSource, frameCount);
}

static ma_result ma_resource_manager_data_stream_cb__get_data_format(ma_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    return ma_resource_manager_data_stream_get_data_format((ma_resource_manager_data_stream*)pDataSource, pFormat, pChannels, pSampleRate);
}

static ma_result ma_resource_manager_data_stream_cb__get_cursor_in_pcm_frames(ma_data_source* pDataSource, ma_uint64* pCursor)
{
    return ma_resource_manager_data_stream_get_cursor_in_pcm_frames((ma_resource_manager_data_stream*)pDataSource, pCursor);
}

static ma_result ma_resource_manager_data_stream_cb__get_length_in_pcm_frames(ma_data_source* pDataSource, ma_uint64* pLength)
{
    return ma_resource_manager_data_stream_get_length_in_pcm_frames((ma_resource_manager_data_stream*)pDataSource, pLength);
}

MA_API ma_result ma_resource_manager_data_stream_init(ma_resource_manager* pResourceManager, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_stream* pDataStream)
{
    ma_result result;
    char* pFilePathCopy;
    ma_job job;
    ma_bool32 waitBeforeReturning = MA_FALSE;
    ma_async_notification_event waitNotification;

    if (pDataStream == NULL) {
        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
        }

        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pDataStream);
    pDataStream->ds.onRead          = ma_resource_manager_data_stream_cb__read_pcm_frames;
    pDataStream->ds.onSeek          = ma_resource_manager_data_stream_cb__seek_to_pcm_frame;
    pDataStream->ds.onMap           = ma_resource_manager_data_stream_cb__map;
    pDataStream->ds.onUnmap         = ma_resource_manager_data_stream_cb__unmap;
    pDataStream->ds.onGetDataFormat = ma_resource_manager_data_stream_cb__get_data_format;
    pDataStream->ds.onGetCursor     = ma_resource_manager_data_stream_cb__get_cursor_in_pcm_frames;
    pDataStream->ds.onGetLength     = ma_resource_manager_data_stream_cb__get_length_in_pcm_frames;

    pDataStream->pResourceManager   = pResourceManager;
    pDataStream->flags              = flags;
    pDataStream->result             = MA_BUSY;

    if (pResourceManager == NULL || pFilePath == NULL) {
        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_FAILED);
        }

        return MA_INVALID_ARGS;
    }

    /* We want all access to the VFS and the internal decoder to happen on the job thread just to keep things easier to manage for the VFS.  */

    /* We need a copy of the file path. We should probably make this more efficient, but for now we'll do a transient memory allocation. */
    pFilePathCopy = ma_copy_string(pFilePath, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);
    if (pFilePathCopy == NULL) {
        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_FAILED);
        }

        return MA_OUT_OF_MEMORY;
    }

    /*
    We need to check for the presence of MA_DATA_SOURCE_FLAG_ASYNC. If it's not set, we need to wait before returning. Otherwise we
    can return immediately. Likewise, we'll also check for MA_DATA_SOURCE_FLAG_WAIT_INIT and do the same.
    */
    if ((flags & MA_DATA_SOURCE_FLAG_ASYNC) == 0 || (flags & MA_DATA_SOURCE_FLAG_WAIT_INIT) != 0) {
        waitBeforeReturning = MA_TRUE;
        ma_async_notification_event_init(&waitNotification);
    }

    /* We now have everything we need to post the job. This is the last thing we need to do from here. The rest will be done by the job thread. */
    job = ma_job_init(MA_JOB_LOAD_DATA_STREAM);
    job.order = ma_resource_manager_data_stream_next_execution_order(pDataStream);
    job.loadDataStream.pDataStream   = pDataStream;
    job.loadDataStream.pFilePath     = pFilePathCopy;
    job.loadDataStream.pNotification = (waitBeforeReturning == MA_TRUE) ? &waitNotification : pNotification;
    result = ma_resource_manager_post_job(pResourceManager, &job);
    if (result != MA_SUCCESS) {
        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_FAILED);
        }

        if (waitBeforeReturning) {
            ma_async_notification_event_uninit(&waitNotification);
        }

        ma__free_from_callbacks(pFilePathCopy, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);
        return result;
    }

    /* Wait if needed. */
    if (waitBeforeReturning) {
        ma_async_notification_event_wait(&waitNotification);
        ma_async_notification_event_uninit(&waitNotification);

        if (pNotification != NULL) {
            ma_async_notification_signal(pNotification, MA_NOTIFICATION_COMPLETE);
        }
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_uninit(ma_resource_manager_data_stream* pDataStream)
{
    ma_async_notification_event freeEvent;
    ma_job job;

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    /* The first thing to do is set the result to unavailable. This will prevent future page decoding. */
    c89atomic_exchange_i32(&pDataStream->result, MA_UNAVAILABLE);

    /*
    We need to post a job to ensure we're not in the middle or decoding or anything. Because the object is owned by the caller, we'll need
    to wait for it to complete before returning which means we need an event.
    */
    ma_async_notification_event_init(&freeEvent);

    job = ma_job_init(MA_JOB_FREE_DATA_STREAM);
    job.order = ma_resource_manager_data_stream_next_execution_order(pDataStream);
    job.freeDataStream.pDataStream   = pDataStream;
    job.freeDataStream.pNotification = &freeEvent;
    ma_resource_manager_post_job(pDataStream->pResourceManager, &job);

    /* We need to wait for the job to finish processing before we return. */
    ma_async_notification_event_wait(&freeEvent);
    ma_async_notification_event_uninit(&freeEvent);

    return MA_SUCCESS;
}


static ma_uint32 ma_resource_manager_data_stream_get_page_size_in_frames(ma_resource_manager_data_stream* pDataStream)
{
    MA_ASSERT(pDataStream != NULL);
    MA_ASSERT(pDataStream->isDecoderInitialized == MA_TRUE);

    return MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS * (pDataStream->decoder.outputSampleRate/1000); 
}

static void* ma_resource_manager_data_stream_get_page_data_pointer(ma_resource_manager_data_stream* pDataStream, ma_uint32 pageIndex, ma_uint32 relativeCursor)
{
    MA_ASSERT(pDataStream != NULL);
    MA_ASSERT(pDataStream->isDecoderInitialized == MA_TRUE);
    MA_ASSERT(pageIndex == 0 || pageIndex == 1);

    return ma_offset_ptr(pDataStream->pPageData, ((ma_resource_manager_data_stream_get_page_size_in_frames(pDataStream) * pageIndex) + relativeCursor) * ma_get_bytes_per_frame(pDataStream->decoder.outputFormat, pDataStream->decoder.outputChannels));
}

static void ma_resource_manager_data_stream_fill_page(ma_resource_manager_data_stream* pDataStream, ma_uint32 pageIndex)
{
    ma_bool32 isLooping;
    ma_uint64 pageSizeInFrames;
    ma_uint64 totalFramesReadForThisPage = 0;
    void* pPageData = ma_resource_manager_data_stream_get_page_data_pointer(pDataStream, pageIndex, 0);

    pageSizeInFrames = ma_resource_manager_data_stream_get_page_size_in_frames(pDataStream);

    ma_resource_manager_data_stream_get_looping(pDataStream, &isLooping);   /* Won't fail. */

    if (isLooping) {
        while (totalFramesReadForThisPage < pageSizeInFrames) {
            ma_uint64 framesRemaining;
            ma_uint64 framesRead;

            framesRemaining = pageSizeInFrames - totalFramesReadForThisPage;
            framesRead = ma_decoder_read_pcm_frames(&pDataStream->decoder, ma_offset_pcm_frames_ptr(pPageData, totalFramesReadForThisPage, pDataStream->decoder.outputFormat, pDataStream->decoder.outputChannels), framesRemaining);
            totalFramesReadForThisPage += framesRead;

            /* Loop back to the start if we reached the end. We'll also have a known length at this point as well. */
            if (framesRead < framesRemaining) {
                if (pDataStream->totalLengthInPCMFrames == 0) {
                    ma_decoder_get_cursor_in_pcm_frames(&pDataStream->decoder, &pDataStream->totalLengthInPCMFrames);
                }

                ma_decoder_seek_to_pcm_frame(&pDataStream->decoder, 0);
            }
        }
    } else {
        totalFramesReadForThisPage = ma_decoder_read_pcm_frames(&pDataStream->decoder, pPageData, pageSizeInFrames);
    }

    if (totalFramesReadForThisPage < pageSizeInFrames) {
        c89atomic_exchange_32(&pDataStream->isDecoderAtEnd, MA_TRUE);
    }

    c89atomic_exchange_32(&pDataStream->pageFrameCount[pageIndex], (ma_uint32)totalFramesReadForThisPage);
    c89atomic_exchange_32(&pDataStream->isPageValid[pageIndex], MA_TRUE);
}

static void ma_resource_manager_data_stream_fill_pages(ma_resource_manager_data_stream* pDataStream)
{
    ma_uint32 iPage;

    MA_ASSERT(pDataStream != NULL);

    /* For each page... */
    for (iPage = 0; iPage < 2; iPage += 1) {
        ma_resource_manager_data_stream_fill_page(pDataStream, iPage);

        /* If we reached the end make sure we get out of the loop to prevent us from trying to load the second page. */
        if (ma_resource_manager_data_stream_is_decoder_at_end(pDataStream)) {
            break;
        }
    }
}

MA_API ma_result ma_resource_manager_data_stream_read_pcm_frames(ma_resource_manager_data_stream* pDataStream, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
    ma_result result = MA_SUCCESS;
    ma_uint64 totalFramesProcessed;
    ma_format format;
    ma_uint32 channels;

    /* Safety. */
    if (pFramesRead != NULL) {
        *pFramesRead = 0;
    }

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) != MA_UNAVAILABLE);

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        return MA_INVALID_OPERATION;
    }

    /* Don't attempt to read while we're in the middle of seeking. Tell the caller that we're busy. */
    if (ma_resource_manager_data_stream_seek_counter(pDataStream) > 0) {
        return MA_BUSY;
    }

    ma_resource_manager_data_stream_get_data_format(pDataStream, &format, &channels, NULL);

    /* Reading is implemented in terms of map/unmap. We need to run this in a loop because mapping is clamped against page boundaries. */
    totalFramesProcessed = 0;
    while (totalFramesProcessed < frameCount) {
        void* pMappedFrames;
        ma_uint64 mappedFrameCount;

        mappedFrameCount = frameCount - totalFramesProcessed;
        result = ma_resource_manager_data_stream_map(pDataStream, &pMappedFrames, &mappedFrameCount);
        if (result != MA_SUCCESS) {
            break;
        }

        /* Copy the mapped data to the output buffer if we have one. It's allowed for pFramesOut to be NULL in which case a relative forward seek is performed. */
        if (pFramesOut != NULL) {
            ma_copy_pcm_frames(ma_offset_pcm_frames_ptr(pFramesOut, totalFramesProcessed, format, channels), pMappedFrames, mappedFrameCount, format, channels);
        }

        totalFramesProcessed += mappedFrameCount;

        result = ma_resource_manager_data_stream_unmap(pDataStream, mappedFrameCount);
        if (result != MA_SUCCESS) {
            break;  /* This is really bad - will only get an error here if we failed to post a job to the queue for loading the next page. */
        }
    }

    if (pFramesRead != NULL) {
        *pFramesRead = totalFramesProcessed;
    }

    return result;
}

MA_API ma_result ma_resource_manager_data_stream_map(ma_resource_manager_data_stream* pDataStream, void** ppFramesOut, ma_uint64* pFrameCount)
{
    ma_uint64 framesAvailable;
    ma_uint64 frameCount = 0;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) != MA_UNAVAILABLE);

    if (pFrameCount != NULL) {
        frameCount = *pFrameCount;
        *pFrameCount = 0;
    }
    if (ppFramesOut != NULL) {
        *ppFramesOut = NULL;
    }

    if (pDataStream == NULL || ppFramesOut == NULL || pFrameCount == NULL) {
        return MA_INVALID_ARGS;
    }

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        return MA_INVALID_OPERATION;
    }

    /* Don't attempt to read while we're in the middle of seeking. Tell the caller that we're busy. */
    if (ma_resource_manager_data_stream_seek_counter(pDataStream) > 0) {
        return MA_BUSY;
    }

    /* If the page we're on is invalid it means we've caught up to the job thread. */
    if (c89atomic_load_32(&pDataStream->isPageValid[pDataStream->currentPageIndex]) == MA_FALSE) {
        framesAvailable = 0;
    } else {
        /*
        The page we're on is valid so we must have some frames available. We need to make sure that we don't overflow into the next page, even if it's valid. The reason is
        that the unmap process will only post an update for one page at a time. Keeping mapping tied to page boundaries makes this simpler.
        */
        ma_uint32 currentPageFrameCount = c89atomic_load_32(&pDataStream->pageFrameCount[pDataStream->currentPageIndex]);
        MA_ASSERT(currentPageFrameCount >= pDataStream->relativeCursor);

        framesAvailable = currentPageFrameCount - pDataStream->relativeCursor;
    }

    /* If there's no frames available and the result is set to MA_AT_END we need to return MA_AT_END. */
    if (framesAvailable == 0) {
        if (ma_resource_manager_data_stream_is_decoder_at_end(pDataStream)) {
            return MA_AT_END;
        } else {
            return MA_BUSY; /* There are no frames available, but we're not marked as EOF so we might have caught up to the job thread. Need to return MA_BUSY and wait for more data. */
        }
    }

    MA_ASSERT(framesAvailable > 0);

    if (frameCount > framesAvailable) {
        frameCount = framesAvailable;
    }

    *ppFramesOut = ma_resource_manager_data_stream_get_page_data_pointer(pDataStream, pDataStream->currentPageIndex, pDataStream->relativeCursor);
    *pFrameCount = frameCount;

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_unmap(ma_resource_manager_data_stream* pDataStream, ma_uint64 frameCount)
{
    ma_uint32 newRelativeCursor;
    ma_uint32 pageSizeInFrames;
    ma_job job;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) != MA_UNAVAILABLE);

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        return MA_INVALID_OPERATION;
    }

    /* The frame count should always fit inside a 32-bit integer. */
    if (frameCount > 0xFFFFFFFF) {
        return MA_INVALID_ARGS;
    }

    pageSizeInFrames = ma_resource_manager_data_stream_get_page_size_in_frames(pDataStream);

    /* The absolute cursor needs to be updated. We want to make sure to loop if possible. */
    pDataStream->absoluteCursor += frameCount;
    if (pDataStream->absoluteCursor > pDataStream->totalLengthInPCMFrames && pDataStream->totalLengthInPCMFrames > 0) {
        pDataStream->absoluteCursor = pDataStream->absoluteCursor % pDataStream->totalLengthInPCMFrames;
    }

    /* Here is where we need to check if we need to load a new page, and if so, post a job to load it. */
    newRelativeCursor = pDataStream->relativeCursor + (ma_uint32)frameCount;

    /* If the new cursor has flowed over to the next page we need to mark the old one as invalid and post an event for it. */
    if (newRelativeCursor >= pageSizeInFrames) {
        newRelativeCursor -= pageSizeInFrames;

        /* Here is where we post the job start decoding. */
        job = ma_job_init(MA_JOB_PAGE_DATA_STREAM);
        job.order = ma_resource_manager_data_stream_next_execution_order(pDataStream);
        job.pageDataStream.pDataStream = pDataStream;
        job.pageDataStream.pageIndex   = pDataStream->currentPageIndex;

        /* The page needs to be marked as invalid so that the public API doesn't try reading from it. */
        c89atomic_exchange_32(&pDataStream->isPageValid[pDataStream->currentPageIndex], MA_FALSE);

        /* Before posting the job we need to make sure we set some state. */
        pDataStream->relativeCursor   = newRelativeCursor;
        pDataStream->currentPageIndex = (pDataStream->currentPageIndex + 1) & 0x01;
        return ma_resource_manager_post_job(pDataStream->pResourceManager, &job);
    } else {
        /* We haven't moved into a new page so we can just move the cursor forward. */
        pDataStream->relativeCursor = newRelativeCursor;
        return MA_SUCCESS;
    }
}

MA_API ma_result ma_resource_manager_data_stream_seek_to_pcm_frame(ma_resource_manager_data_stream* pDataStream, ma_uint64 frameIndex)
{
    ma_job job;
    ma_result streamResult;

    streamResult = ma_resource_manager_data_stream_result(pDataStream);

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(streamResult != MA_UNAVAILABLE);

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (streamResult != MA_SUCCESS && streamResult != MA_BUSY) {
        return MA_INVALID_OPERATION;
    }

    /* Increment the seek counter first to indicate to read_paged_pcm_frames() and map_paged_pcm_frames() that we are in the middle of a seek and MA_BUSY should be returned. */
    c89atomic_fetch_add_32(&pDataStream->seekCounter, 1);

    /*
    We need to clear our currently loaded pages so that the stream starts playback from the new seek point as soon as possible. These are for the purpose of the public
    API and will be ignored by the seek job. The seek job will operate on the assumption that both pages have been marked as invalid and the cursor is at the start of
    the first page.
    */
    pDataStream->relativeCursor   = 0;
    pDataStream->currentPageIndex = 0;
    c89atomic_exchange_32(&pDataStream->isPageValid[0], MA_FALSE);
    c89atomic_exchange_32(&pDataStream->isPageValid[1], MA_FALSE);

    /*
    The public API is not allowed to touch the internal decoder so we need to use a job to perform the seek. When seeking, the job thread will assume both pages
    are invalid and any content contained within them will be discarded and replaced with newly decoded data.
    */
    job = ma_job_init(MA_JOB_SEEK_DATA_STREAM);
    job.order = ma_resource_manager_data_stream_next_execution_order(pDataStream);
    job.seekDataStream.pDataStream = pDataStream;
    job.seekDataStream.frameIndex  = frameIndex;
    return ma_resource_manager_post_job(pDataStream->pResourceManager, &job);
}

MA_API ma_result ma_resource_manager_data_stream_get_data_format(ma_resource_manager_data_stream* pDataStream, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) != MA_UNAVAILABLE);

    if (pFormat != NULL) {
        *pFormat = ma_format_unknown;
    }

    if (pChannels != NULL) {
        *pChannels = 0;
    }

    if (pSampleRate != NULL) {
        *pSampleRate = 0;
    }

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        return MA_INVALID_OPERATION;
    }

    /*
    We're being a little bit naughty here and accessing the internal decoder from the public API. The output data format is constant, and we've defined this function
    such that the application is responsible for ensuring it's not called while uninitializing so it should be safe.
    */
    return ma_data_source_get_data_format(&pDataStream->decoder, pFormat, pChannels, pSampleRate);
}

MA_API ma_result ma_resource_manager_data_stream_get_cursor_in_pcm_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pCursor)
{
    if (pCursor == NULL) {
        return MA_INVALID_ARGS;
    }

    *pCursor = 0;

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) != MA_UNAVAILABLE);

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        return MA_INVALID_OPERATION;
    }

    *pCursor = pDataStream->absoluteCursor;

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_get_length_in_pcm_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pLength)
{
    ma_result streamResult;

    if (pLength == NULL) {
        return MA_INVALID_ARGS;
    }

    *pLength = 0;

    streamResult = ma_resource_manager_data_stream_result(pDataStream);

    /* We cannot be using the data source after it's been uninitialized. */
    MA_ASSERT(streamResult != MA_UNAVAILABLE);

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    if (streamResult != MA_SUCCESS) {
        return streamResult;
    }

    /*
    We most definitely do not want to be calling ma_decoder_get_length_in_pcm_frames() directly. Instead we want to use a cached value that we
    calculated when we initialized it on the job thread.
    */
    *pLength = pDataStream->totalLengthInPCMFrames;
    if (*pLength == 0) {
        return MA_NOT_IMPLEMENTED;  /* Some decoders may not have a known length. */
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_result(const ma_resource_manager_data_stream* pDataStream)
{
    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    return c89atomic_load_i32(&pDataStream->result);
}

MA_API ma_result ma_resource_manager_data_stream_set_looping(ma_resource_manager_data_stream* pDataStream, ma_bool32 isLooping)
{
    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_32(&pDataStream->isLooping, isLooping);

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_get_looping(const ma_resource_manager_data_stream* pDataStream, ma_bool32* pIsLooping)
{
    if (pIsLooping == NULL) {
        return MA_INVALID_ARGS;
    }

    *pIsLooping = MA_FALSE;

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    *pIsLooping = c89atomic_load_32((ma_bool32*)&pDataStream->isLooping);   /* Naughty const-cast. Value won't change from here in practice (maybe from another thread). */

    return MA_SUCCESS;
}

MA_API ma_result ma_resource_manager_data_stream_get_available_frames(ma_resource_manager_data_stream* pDataStream, ma_uint64* pAvailableFrames)
{
    ma_uint32 pageIndex0;
    ma_uint32 pageIndex1;
    ma_uint32 relativeCursor;
    ma_uint64 availableFrames;

    if (pAvailableFrames == NULL) {
        return MA_INVALID_ARGS;
    }

    *pAvailableFrames = 0;

    if (pDataStream == NULL) {
        return MA_INVALID_ARGS;
    }

    pageIndex0     =  pDataStream->currentPageIndex;
    pageIndex1     = (pDataStream->currentPageIndex + 1) & 0x01;
    relativeCursor =  pDataStream->relativeCursor;

    availableFrames = 0;
    if (c89atomic_load_32(&pDataStream->isPageValid[pageIndex0])) {
        availableFrames += c89atomic_load_32(&pDataStream->pageFrameCount[pageIndex0]) - relativeCursor;
        if (c89atomic_load_32(&pDataStream->isPageValid[pageIndex1])) {
            availableFrames += c89atomic_load_32(&pDataStream->pageFrameCount[pageIndex1]);
        }
    }

    *pAvailableFrames = availableFrames;
    return MA_SUCCESS;
}



MA_API ma_result ma_resource_manager_data_source_init(ma_resource_manager* pResourceManager, const char* pName, ma_uint32 flags, ma_async_notification* pNotification, ma_resource_manager_data_source* pDataSource)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pDataSource);

    if (pResourceManager == NULL || pName == NULL) {
        return MA_INVALID_ARGS;
    }

    pDataSource->flags = flags;

    /* The data source itself is just a data stream or a data buffer. */
    if ((flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_init(pResourceManager, pName, flags, pNotification, &pDataSource->stream);
    } else {
        return ma_resource_manager_data_buffer_init(pResourceManager, pName, flags, pNotification, &pDataSource->buffer);
    }
}

MA_API ma_result ma_resource_manager_data_source_uninit(ma_resource_manager_data_source* pDataSource)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    /* All we need to is uninitialize the underlying data buffer or data stream. */
    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_uninit(&pDataSource->stream);
    } else {
        return ma_resource_manager_data_buffer_uninit(&pDataSource->buffer);
    }
}

MA_API ma_result ma_resource_manager_data_source_read_pcm_frames(ma_resource_manager_data_source* pDataSource, void* pFramesOut, ma_uint64 frameCount, ma_uint64* pFramesRead)
{
    /* Safety. */
    if (pFramesRead != NULL) {
        *pFramesRead = 0;
    }

    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_read_pcm_frames(&pDataSource->stream, pFramesOut, frameCount, pFramesRead);
    } else {
        return ma_resource_manager_data_buffer_read_pcm_frames(&pDataSource->buffer, pFramesOut, frameCount, pFramesRead);
    }
}

MA_API ma_result ma_resource_manager_data_source_seek_to_pcm_frame(ma_resource_manager_data_source* pDataSource, ma_uint64 frameIndex)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_seek_to_pcm_frame(&pDataSource->stream, frameIndex);
    } else {
        return ma_resource_manager_data_buffer_seek_to_pcm_frame(&pDataSource->buffer, frameIndex);
    }
}

MA_API ma_result ma_resource_manager_data_source_map(ma_resource_manager_data_source* pDataSource, void** ppFramesOut, ma_uint64* pFrameCount)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_map(&pDataSource->stream, ppFramesOut, pFrameCount);
    } else {
        return ma_resource_manager_data_buffer_map(&pDataSource->buffer, ppFramesOut, pFrameCount);
    }
}

MA_API ma_result ma_resource_manager_data_source_unmap(ma_resource_manager_data_source* pDataSource, ma_uint64 frameCount)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_unmap(&pDataSource->stream, frameCount);
    } else {
        return ma_resource_manager_data_buffer_unmap(&pDataSource->buffer, frameCount);
    }
}

MA_API ma_result ma_resource_manager_data_source_get_data_format(ma_resource_manager_data_source* pDataSource, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_get_data_format(&pDataSource->stream, pFormat, pChannels, pSampleRate);
    } else {
        return ma_resource_manager_data_buffer_get_data_format(&pDataSource->buffer, pFormat, pChannels, pSampleRate);
    }
}

MA_API ma_result ma_resource_manager_data_source_get_cursor_in_pcm_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pCursor)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_get_cursor_in_pcm_frames(&pDataSource->stream, pCursor);
    } else {
        return ma_resource_manager_data_buffer_get_cursor_in_pcm_frames(&pDataSource->buffer, pCursor);
    }
}

MA_API ma_result ma_resource_manager_data_source_get_length_in_pcm_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pLength)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_get_length_in_pcm_frames(&pDataSource->stream, pLength);
    } else {
        return ma_resource_manager_data_buffer_get_length_in_pcm_frames(&pDataSource->buffer, pLength);
    }
}

MA_API ma_result ma_resource_manager_data_source_result(const ma_resource_manager_data_source* pDataSource)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_result(&pDataSource->stream);
    } else {
        return ma_resource_manager_data_buffer_result(&pDataSource->buffer);
    }
}

MA_API ma_result ma_resource_manager_data_source_set_looping(ma_resource_manager_data_source* pDataSource, ma_bool32 isLooping)
{
    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_set_looping(&pDataSource->stream, isLooping);
    } else {
        return ma_resource_manager_data_buffer_set_looping(&pDataSource->buffer, isLooping);
    }
}

MA_API ma_result ma_resource_manager_data_source_get_looping(const ma_resource_manager_data_source* pDataSource, ma_bool32* pIsLooping)
{
    if (pDataSource == NULL || pIsLooping == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_get_looping(&pDataSource->stream, pIsLooping);
    } else {
        return ma_resource_manager_data_buffer_get_looping(&pDataSource->buffer, pIsLooping);
    }
}

MA_API ma_result ma_resource_manager_data_source_get_available_frames(ma_resource_manager_data_source* pDataSource, ma_uint64* pAvailableFrames)
{
    if (pAvailableFrames == NULL) {
        return MA_INVALID_ARGS;
    }

    *pAvailableFrames = 0;

    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    if ((pDataSource->flags & MA_DATA_SOURCE_FLAG_STREAM) != 0) {
        return ma_resource_manager_data_stream_get_available_frames(&pDataSource->stream, pAvailableFrames);
    } else {
        return ma_resource_manager_data_buffer_get_available_frames(&pDataSource->buffer, pAvailableFrames);
    }
}


MA_API ma_result ma_resource_manager_post_job(ma_resource_manager* pResourceManager, const ma_job* pJob)
{
    if (pResourceManager == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_job_queue_post(&pResourceManager->jobQueue, pJob);
}

MA_API ma_result ma_resource_manager_post_job_quit(ma_resource_manager* pResourceManager)
{
    ma_job job = ma_job_init(MA_JOB_QUIT);
    return ma_resource_manager_post_job(pResourceManager, &job);
}

MA_API ma_result ma_resource_manager_next_job(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    if (pResourceManager == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_job_queue_next(&pResourceManager->jobQueue, pJob);
}


static ma_result ma_resource_manager_process_job__load_data_buffer(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_result result = MA_SUCCESS;
    ma_resource_manager_data_buffer* pDataBuffer;
    ma_decoder* pDecoder = NULL;       /* Malloc'd here, and then free'd on the last page decode. */
    ma_uint64 totalFrameCount = 0;
    void* pData = NULL;
    ma_uint64 dataSizeInBytes = 0;
    ma_uint64 framesRead = 0;   /* <-- Keeps track of how many frames we read for the first page. */

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);
    MA_ASSERT(pJob->loadDataBuffer.pFilePath          != NULL);
    MA_ASSERT(pJob->loadDataBuffer.pDataBuffer        != NULL);
    MA_ASSERT(pJob->freeDataBuffer.pDataBuffer->pNode != NULL);
    MA_ASSERT(pJob->loadDataBuffer.pDataBuffer->pNode->isDataOwnedByResourceManager == MA_TRUE);  /* The data should always be owned by the resource manager. */

    pDataBuffer = pJob->loadDataBuffer.pDataBuffer;

    /* First thing we need to do is check whether or not the data buffer is getting deleted. If so we just abort. */
    if (ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_BUSY) {
        result = MA_INVALID_OPERATION;    /* The data buffer may be getting deleted before it's even been loaded. */
        goto done;
    }

    /* The data buffer is not getting deleted, but we may be getting executed out of order. If so, we need to push the job back onto the queue and return. */
    if (pJob->order != pDataBuffer->pNode->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Attempting to execute out of order. Probably interleaved with a MA_JOB_FREE_DATA_BUFFER job. */
    }

    if (pDataBuffer->pNode->data.type == ma_resource_manager_data_buffer_encoding_encoded) {
        /* No decoding. Just store the file contents in memory. */
        size_t sizeInBytes;

        result = ma_vfs_open_and_read_file_ex(pResourceManager->config.pVFS, pJob->loadDataBuffer.pFilePath, &pData, &sizeInBytes, &pResourceManager->config.allocationCallbacks, MA_ALLOCATION_TYPE_ENCODED_BUFFER);
        if (result == MA_SUCCESS) {
            pDataBuffer->pNode->data.encoded.pData       = pData;
            pDataBuffer->pNode->data.encoded.sizeInBytes = sizeInBytes;
        }

        result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pJob->loadDataBuffer.pInitNotification);
    } else  {
        /* Decoding. */
        ma_uint64 dataSizeInFrames;
        ma_uint64 pageSizeInFrames;

        /*
        With the file initialized we now need to initialize the decoder. We need to pass this decoder around on the job queue so we'll need to
        allocate memory for this dynamically.
        */
        pDecoder = (ma_decoder*)ma__malloc_from_callbacks(sizeof(*pDecoder), &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);
        if (pDecoder == NULL) {
            result = MA_OUT_OF_MEMORY;
            goto done;
        }

        result = ma_resource_manager__init_decoder(pResourceManager, pJob->loadDataBuffer.pFilePath, pDecoder);

        /* Make sure we never set the result code to MA_BUSY or else we'll get everything confused. */
        if (result == MA_BUSY) {
            result = MA_ERROR;
        }

        if (result != MA_SUCCESS) {
            ma__free_from_callbacks(pDecoder, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);
            goto done;
        }

        /*
        Getting here means we have the decoder. We can now get prepared to start decoding. The first thing we need is a buffer, but to determine the
        size we need to get the length of the sound in PCM frames. If the length cannot be determined we need to mark it as such and not set the data
        pointer in the data buffer until the very end.

        If after decoding the first page we complete decoding we need to fire the event and ensure the status is set to MA_SUCCESS.
        */
        pDataBuffer->pNode->data.decoded.format     = pDecoder->outputFormat;
        pDataBuffer->pNode->data.decoded.channels   = pDecoder->outputChannels;
        pDataBuffer->pNode->data.decoded.sampleRate = pDecoder->outputSampleRate;

        pageSizeInFrames = MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS * (pDecoder->outputSampleRate/1000);

        totalFrameCount = ma_decoder_get_length_in_pcm_frames(pDecoder);
        if (totalFrameCount > 0) {
            /* It's a known length. We can allocate the buffer now. */
            dataSizeInFrames = totalFrameCount;
        } else {
            /* It's an unknown length. We need to dynamically expand the buffer as we decode. To start with we allocate space for one page. We'll then double it as we need more space. */
            dataSizeInFrames = pageSizeInFrames;
        }

        dataSizeInBytes = dataSizeInFrames * ma_get_bytes_per_frame(pDecoder->outputFormat, pDecoder->outputChannels);
        if (dataSizeInBytes > MA_SIZE_MAX) {
            ma__free_from_callbacks(pDecoder, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);
            result = MA_TOO_BIG;
            goto done;
        }

        pData = ma__malloc_from_callbacks((size_t)dataSizeInBytes, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
        if (pData == NULL) {
            ma__free_from_callbacks(pDecoder, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);
            result = MA_OUT_OF_MEMORY;
            goto done;
        }

        /* The buffer needs to be initialized to silence in case the caller reads from it. */
        ma_silence_pcm_frames(pData, dataSizeInFrames, pDecoder->outputFormat, pDecoder->outputChannels);


        /* We should have enough room in our buffer for at least a whole page, or the entire file (if it's less than a page). We can now decode that first page. */
        framesRead = ma_decoder_read_pcm_frames(pDecoder, pData, pageSizeInFrames);
        if (framesRead < pageSizeInFrames) {
            /* We've read the entire sound. This is the simple case. We just need to set the result to MA_SUCCESS. */
            pDataBuffer->pNode->data.decoded.pData      = pData;
            pDataBuffer->pNode->data.decoded.frameCount = framesRead;

            /*
            decodedFrameCount is what other threads will use to determine whether or not data is available. We must ensure pData and frameCount
            is set *before* setting the number of available frames. This way, the other thread need only check if decodedFrameCount > 0, in
            which case it can assume pData and frameCount are valid.
            */
            c89atomic_thread_fence(c89atomic_memory_order_acquire);
            pDataBuffer->pNode->data.decoded.decodedFrameCount = framesRead;

            ma_decoder_uninit(pDecoder);
            ma__free_from_callbacks(pDecoder, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);

            result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pJob->loadDataBuffer.pInitNotification);
            goto done;
        } else {
            /* We've still got more to decode. We just set the result to MA_BUSY which will tell the next section below to post a paging event. */
            result = MA_BUSY;
        }

    #if 0
        /* If we successfully initialized and the sound is of a known length we can start initialize the connector. */
        if (result == MA_SUCCESS || result == MA_BUSY) {
            if (pDataBuffer->pNode->data.decoded.decodedFrameCount > 0) {
                result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pJob->loadDataBuffer.pInitNotification);
            }
        }
    #endif
    }

done:
    ma__free_from_callbacks(pJob->loadDataBuffer.pFilePath, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);

    /*
    We need to set the result to at the very end to ensure no other threads try reading the data before we've fully initialized the object. Other threads
    are going to be inspecting this variable to determine whether or not they're ready to read data. We can only change the result if it's set to MA_BUSY
    because otherwise we may be changing away from an error code which would be bad. An example is if the application creates a data buffer, but then
    immediately deletes it before we've got to this point. In this case, pDataBuffer->result will be MA_UNAVAILABLE, and setting it to MA_SUCCESS or any
    other error code would cause the buffer to look like it's in a state that it's not.
    */
    c89atomic_compare_and_swap_32(&pDataBuffer->pNode->result, MA_BUSY, result);

    /*
    If our result is MA_BUSY we need to post a job to start loading. It's important that we do this after setting the result to the buffer so that the
    decoding process happens at the right time. If we don't, there's a window where the MA_JOB_PAGE_DATA_BUFFER event will see a status of something
    other than MA_BUSY and then abort the decoding process with an error.
    */
    if (result == MA_BUSY && pDecoder != NULL) {
        /* We've still got more to decode. We need to post a job to continue decoding. */
        ma_job pageDataBufferJob;

        MA_ASSERT(pDecoder != NULL);
        MA_ASSERT(pData    != NULL);

        pageDataBufferJob = ma_job_init(MA_JOB_PAGE_DATA_BUFFER);
        pageDataBufferJob.order                                 = ma_resource_manager_data_buffer_next_execution_order(pDataBuffer);
        pageDataBufferJob.pageDataBuffer.pDataBuffer            = pDataBuffer;
        pageDataBufferJob.pageDataBuffer.pDecoder               = pDecoder;
        pageDataBufferJob.pageDataBuffer.pCompletedNotification = pJob->loadDataBuffer.pCompletedNotification;
        pageDataBufferJob.pageDataBuffer.pData                  = pData;
        pageDataBufferJob.pageDataBuffer.dataSizeInBytes        = (size_t)dataSizeInBytes;   /* Safe cast. Was checked for > MA_SIZE_MAX earlier. */
        pageDataBufferJob.pageDataBuffer.decodedFrameCount      = framesRead;

        if (totalFrameCount > 0) {
            pageDataBufferJob.pageDataBuffer.isUnknownLength = MA_FALSE;

            pDataBuffer->pNode->data.decoded.pData      = pData;
            pDataBuffer->pNode->data.decoded.frameCount = totalFrameCount;

            /*
            decodedFrameCount is what other threads will use to determine whether or not data is available. We must ensure pData and frameCount
            is set *before* setting the number of available frames. This way, the other thread need only check if decodedFrameCount > 0, in
            which case it can assume pData and frameCount are valid.
            */
            c89atomic_thread_fence(c89atomic_memory_order_acquire);
            pDataBuffer->pNode->data.decoded.decodedFrameCount = framesRead;

            /* The sound is of a known length so we can go ahead and initialize the connector now. */
            result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pJob->loadDataBuffer.pInitNotification);
        } else {
            pageDataBufferJob.pageDataBuffer.isUnknownLength = MA_TRUE;

            /*
            These members are all set after the last page has been decoded. The reason for this is that the application should not be attempting to
            read any data until the sound is fully decoded because we're going to be dynamically expanding pData and we'll be introducing complications
            by letting the application get access to it.
            */
            pDataBuffer->pNode->data.decoded.pData             = NULL;
            pDataBuffer->pNode->data.decoded.frameCount        = 0;
            pDataBuffer->pNode->data.decoded.decodedFrameCount = 0;
        }

        if (result == MA_SUCCESS) {
            /* The job has been set up so it can now be posted. */
            result = ma_resource_manager_post_job(pResourceManager, &pageDataBufferJob);

            /* The result needs to be set to MA_BUSY to ensure the status of the data buffer is set properly in the next section. */
            if (result == MA_SUCCESS) {
                result = MA_BUSY;
            }
        }
            
        /* We want to make sure we don't signal the event here. It needs to be delayed until the last page. */
        pJob->loadDataBuffer.pCompletedNotification = NULL;

        /* Make sure the buffer's status is updated appropriately, but make sure we never move away from a MA_BUSY state to ensure we don't overwrite any error codes. */
        c89atomic_compare_and_swap_32(&pDataBuffer->pNode->result, MA_BUSY, result);
    }

    /* Only signal the other threads after the result has been set just for cleanliness sake. */
    if (pJob->loadDataBuffer.pCompletedNotification != NULL) {
        ma_async_notification_signal(pJob->loadDataBuffer.pCompletedNotification, MA_NOTIFICATION_COMPLETE);
    }

    c89atomic_fetch_add_32(&pDataBuffer->pNode->executionPointer, 1);
    return result;
}

static ma_result ma_resource_manager_process_job__free_data_buffer(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);
    MA_ASSERT(pJob->freeDataBuffer.pDataBuffer        != NULL);
    MA_ASSERT(pJob->freeDataBuffer.pDataBuffer->pNode != NULL);
    MA_ASSERT(ma_resource_manager_data_buffer_node_result(pJob->freeDataBuffer.pDataBuffer->pNode) == MA_UNAVAILABLE);

    if (pJob->order != pJob->freeDataBuffer.pDataBuffer->pNode->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    ma_resource_manager_data_buffer_uninit_internal(pJob->freeDataBuffer.pDataBuffer);

    /* The event needs to be signalled last. */
    if (pJob->freeDataBuffer.pNotification != NULL) {
        ma_async_notification_signal(pJob->freeDataBuffer.pNotification, MA_NOTIFICATION_COMPLETE);
    }

    /*c89atomic_fetch_add_32(&pJob->freeDataBuffer.pDataBuffer->pNode->executionPointer, 1);*/
    return MA_SUCCESS;
}

static ma_result ma_resource_manager_process_job__page_data_buffer(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_result result = MA_SUCCESS;
    ma_uint64 pageSizeInFrames;
    ma_uint64 framesRead;
    void* pRunningData;
    ma_job jobCopy;
    ma_resource_manager_data_buffer* pDataBuffer;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);

    pDataBuffer = pJob->pageDataBuffer.pDataBuffer;

    /* Don't do any more decoding if the data buffer has started the uninitialization process. */
    if (ma_resource_manager_data_buffer_node_result(pDataBuffer->pNode) != MA_BUSY) {
        return MA_INVALID_OPERATION;
    }

    if (pJob->order != pDataBuffer->pNode->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    /* We're going to base everything off the original job. */
    jobCopy = *pJob;

    /* We need to know the size of a page in frames to know how many frames to decode. */
    pageSizeInFrames = MA_RESOURCE_MANAGER_PAGE_SIZE_IN_MILLISECONDS * (jobCopy.pageDataBuffer.pDecoder->outputSampleRate/1000);

    /* If the total length is unknown we may need to expand the size of the buffer. */
    if (jobCopy.pageDataBuffer.isUnknownLength == MA_TRUE) {
        ma_uint64 requiredSize = (jobCopy.pageDataBuffer.decodedFrameCount + pageSizeInFrames) * ma_get_bytes_per_frame(jobCopy.pageDataBuffer.pDecoder->outputFormat, jobCopy.pageDataBuffer.pDecoder->outputChannels);
        if (requiredSize <= MA_SIZE_MAX) {
            if (requiredSize > jobCopy.pageDataBuffer.dataSizeInBytes) {
                size_t newSize = (size_t)ma_max(requiredSize, jobCopy.pageDataBuffer.dataSizeInBytes * 2);
                void *pNewData = ma__realloc_from_callbacks(jobCopy.pageDataBuffer.pData, newSize, jobCopy.pageDataBuffer.dataSizeInBytes, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
                if (pNewData != NULL) {
                    jobCopy.pageDataBuffer.pData           = pNewData;
                    jobCopy.pageDataBuffer.dataSizeInBytes = newSize;
                } else {
                    result = MA_OUT_OF_MEMORY;
                }
            }
        } else {
            result = MA_TOO_BIG;
        }
    }

    /* We should have the memory set up so now we can decode the next page. */
    if (result == MA_SUCCESS) {
        pRunningData = ma_offset_ptr(jobCopy.pageDataBuffer.pData, jobCopy.pageDataBuffer.decodedFrameCount * ma_get_bytes_per_frame(jobCopy.pageDataBuffer.pDecoder->outputFormat, jobCopy.pageDataBuffer.pDecoder->outputChannels));

        framesRead = ma_decoder_read_pcm_frames(jobCopy.pageDataBuffer.pDecoder, pRunningData, pageSizeInFrames);
        if (framesRead < pageSizeInFrames) {
            result = MA_AT_END;
        }

        /* If the total length is known we can increment out decoded frame count. Otherwise it needs to be left at 0 until the last page is decoded. */
        if (jobCopy.pageDataBuffer.isUnknownLength == MA_FALSE) {
            pDataBuffer->pNode->data.decoded.decodedFrameCount += framesRead;
        }

        /*
        If there's more to decode, post a job to keep decoding. Note that we always increment the decoded frame count in the copy of the job because it'll be
        referenced below and we'll need to know the new frame count.
        */
        jobCopy.pageDataBuffer.decodedFrameCount += framesRead;

        if (result != MA_AT_END) {
            jobCopy.order = ma_resource_manager_data_buffer_next_execution_order(pDataBuffer);   /* We need a fresh execution order. */
            result = ma_resource_manager_post_job(pResourceManager, &jobCopy);
        }
    }

    /*
    The result will be MA_SUCCESS if another page is in the queue for decoding. Otherwise it will be set to MA_AT_END if the end has been reached or
    any other result code if some other error occurred. If we are not decoding another page we need to free the decoder and close the file.
    */
    if (result != MA_SUCCESS) {
        ma_decoder_uninit(jobCopy.pageDataBuffer.pDecoder);
        ma__free_from_callbacks(jobCopy.pageDataBuffer.pDecoder, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODER*/);

        /* When the length is unknown we were doubling the size of the buffer each time we needed more data. Let's try reducing this by doing a final realloc(). */
        if (jobCopy.pageDataBuffer.isUnknownLength) {
            ma_uint64 newSizeInBytes = jobCopy.pageDataBuffer.decodedFrameCount * ma_get_bytes_per_frame(pDataBuffer->pNode->data.decoded.format, pDataBuffer->pNode->data.decoded.channels);
            void* pNewData = ma__realloc_from_callbacks(jobCopy.pageDataBuffer.pData, (size_t)newSizeInBytes, jobCopy.pageDataBuffer.dataSizeInBytes, &pResourceManager->config.allocationCallbacks);
            if (pNewData != NULL) {
                jobCopy.pageDataBuffer.pData = pNewData;
                jobCopy.pageDataBuffer.dataSizeInBytes = (size_t)newSizeInBytes;    /* <-- Don't really need to set this, but I think it's good practice. */
            }
        }

        /*
        We can now set the frame counts appropriately. We want to set the frame count regardless of whether or not it had a known length just in case we have
        a weird situation where the frame count an opening time was different to the final count we got after reading.
        */
        pDataBuffer->pNode->data.decoded.pData      = jobCopy.pageDataBuffer.pData;
        pDataBuffer->pNode->data.decoded.frameCount = jobCopy.pageDataBuffer.decodedFrameCount;

        /*
        decodedFrameCount is what other threads will use to determine whether or not data is available. We must ensure pData and frameCount
        is set *before* setting the number of available frames. This way, the other thread need only check if decodedFrameCount > 0, in
        which case it can assume pData and frameCount are valid.
        */
        c89atomic_thread_fence(c89atomic_memory_order_seq_cst);
        pDataBuffer->pNode->data.decoded.decodedFrameCount = jobCopy.pageDataBuffer.decodedFrameCount;


        /* If we reached the end we need to treat it as successful. */
        if (result == MA_AT_END) {
            result  = MA_SUCCESS;
        }

        /* If it was an unknown length, we can finally initialize the connector. For sounds of a known length, the connector was initialized when the first page was decoded in MA_JOB_LOAD_DATA_BUFFER. */
        if (jobCopy.pageDataBuffer.isUnknownLength) {
            result = ma_resource_manager_data_buffer_init_connector(pDataBuffer, pJob->pageDataBuffer.pCompletedNotification);
        }

        /* We need to set the status of the page so other things can know about it. We can only change the status away from MA_BUSY. If it's anything else it cannot be changed. */
        c89atomic_compare_and_swap_32(&pDataBuffer->pNode->result, MA_BUSY, result);

        /* We need to signal an event to indicate that we're done. */
        if (jobCopy.pageDataBuffer.pCompletedNotification != NULL) {
            ma_async_notification_signal(jobCopy.pageDataBuffer.pCompletedNotification, MA_NOTIFICATION_COMPLETE);
        }
    }

    c89atomic_fetch_add_32(&pDataBuffer->pNode->executionPointer, 1);
    return result;
}


static ma_result ma_resource_manager_process_job__load_data_stream(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_result result = MA_SUCCESS;
    ma_decoder_config decoderConfig;
    ma_uint32 pageBufferSizeInBytes;
    ma_resource_manager_data_stream* pDataStream;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);

    pDataStream = pJob->loadDataStream.pDataStream;

    if (ma_resource_manager_data_stream_result(pDataStream) != MA_BUSY) {
        result = MA_INVALID_OPERATION;  /* Most likely the data stream is being uninitialized. */
        goto done;
    }

    if (pJob->order != pDataStream->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    /* We need to initialize the decoder first so we can determine the size of the pages. */
    decoderConfig = ma_decoder_config_init(pResourceManager->config.decodedFormat, pResourceManager->config.decodedChannels, pResourceManager->config.decodedSampleRate);
    decoderConfig.allocationCallbacks = pResourceManager->config.allocationCallbacks;

    result = ma_decoder_init_vfs(pResourceManager->config.pVFS, pJob->loadDataStream.pFilePath, &decoderConfig, &pDataStream->decoder);
    if (result != MA_SUCCESS) {
        goto done;
    }

    /* Retrieve the total length of the file before marking the decoder are loaded. */
    pDataStream->totalLengthInPCMFrames = ma_decoder_get_length_in_pcm_frames(&pDataStream->decoder);

    /*
    Only mark the decoder as initialized when the length of the decoder has been retrieved because that can possibly require a scan over the whole file
    and we don't want to have another thread trying to access the decoder while it's scanning.
    */
    pDataStream->isDecoderInitialized = MA_TRUE;

    /* We have the decoder so we can now initialize our page buffer. */
    pageBufferSizeInBytes = ma_resource_manager_data_stream_get_page_size_in_frames(pDataStream) * 2 * ma_get_bytes_per_frame(pDataStream->decoder.outputFormat, pDataStream->decoder.outputChannels);

    pDataStream->pPageData = ma__malloc_from_callbacks(pageBufferSizeInBytes, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
    if (pDataStream->pPageData == NULL) {
        ma_decoder_uninit(&pDataStream->decoder);
        result = MA_OUT_OF_MEMORY;
        goto done;
    }

    /* We have our decoder and our page buffer, so now we need to fill our pages. */
    ma_resource_manager_data_stream_fill_pages(pDataStream);

    /* And now we're done. We want to make sure the result is MA_SUCCESS. */
    result = MA_SUCCESS;

done:
    ma__free_from_callbacks(pJob->loadDataStream.pFilePath, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_TRANSIENT_STRING*/);

    /* We can only change the status away from MA_BUSY. If it's set to anything else it means an error has occurred somewhere or the uninitialization process has started (most likely). */
    c89atomic_compare_and_swap_32(&pDataStream->result, MA_BUSY, result);

    /* Only signal the other threads after the result has been set just for cleanliness sake. */
    if (pJob->loadDataStream.pNotification != NULL) {
        ma_async_notification_signal(pJob->loadDataStream.pNotification, MA_NOTIFICATION_COMPLETE);
    }

    c89atomic_fetch_add_32(&pDataStream->executionPointer, 1);
    return result;
}

static ma_result ma_resource_manager_process_job__free_data_stream(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_resource_manager_data_stream* pDataStream;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);

    pDataStream = pJob->freeDataStream.pDataStream;
    MA_ASSERT(pDataStream != NULL);

    /* If our status is not MA_UNAVAILABLE we have a bug somewhere. */
    MA_ASSERT(ma_resource_manager_data_stream_result(pDataStream) == MA_UNAVAILABLE);

    if (pJob->order != pDataStream->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    if (pDataStream->isDecoderInitialized) {
        ma_decoder_uninit(&pDataStream->decoder);
    }

    if (pDataStream->pPageData != NULL) {
        ma__free_from_callbacks(pDataStream->pPageData, &pResourceManager->config.allocationCallbacks/*, MA_ALLOCATION_TYPE_DECODED_BUFFER*/);
        pDataStream->pPageData = NULL;  /* Just in case... */
    }

    /* The event needs to be signalled last. */
    if (pJob->freeDataStream.pNotification != NULL) {
        ma_async_notification_signal(pJob->freeDataStream.pNotification, MA_NOTIFICATION_COMPLETE);
    }

    /*c89atomic_fetch_add_32(&pDataStream->executionPointer, 1);*/
    return MA_SUCCESS;
}

static ma_result ma_resource_manager_process_job__page_data_stream(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_result result = MA_SUCCESS;
    ma_resource_manager_data_stream* pDataStream;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);

    pDataStream = pJob->pageDataStream.pDataStream;
    MA_ASSERT(pDataStream != NULL);

    /* For streams, the status should be MA_SUCCESS. */
    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS) {
        result = MA_INVALID_OPERATION;
        goto done;
    }

    if (pJob->order != pDataStream->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    ma_resource_manager_data_stream_fill_page(pDataStream, pJob->pageDataStream.pageIndex);

done:
    c89atomic_fetch_add_32(&pDataStream->executionPointer, 1);
    return result;
}

static ma_result ma_resource_manager_process_job__seek_data_stream(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    ma_result result = MA_SUCCESS;
    ma_resource_manager_data_stream* pDataStream;

    MA_ASSERT(pResourceManager != NULL);
    MA_ASSERT(pJob             != NULL);

    pDataStream = pJob->seekDataStream.pDataStream;
    MA_ASSERT(pDataStream != NULL);

    /* For streams the status should be MA_SUCCESS for this to do anything. */
    if (ma_resource_manager_data_stream_result(pDataStream) != MA_SUCCESS || pDataStream->isDecoderInitialized == MA_FALSE) {
        result = MA_INVALID_OPERATION;
        goto done;
    }

    if (pJob->order != pDataStream->executionPointer) {
        return ma_resource_manager_post_job(pResourceManager, pJob);    /* Out of order. */
    }

    /*
    With seeking we just assume both pages are invalid and the relative frame cursor at at position 0. This is basically exactly the same as loading, except
    instead of initializing the decoder, we seek to a frame.
    */
    ma_decoder_seek_to_pcm_frame(&pDataStream->decoder, pJob->seekDataStream.frameIndex);

    /* After seeking we'll need to reload the pages. */
    ma_resource_manager_data_stream_fill_pages(pDataStream);

    /* We need to let the public API know that we're done seeking. */
    c89atomic_fetch_sub_32(&pDataStream->seekCounter, 1);

done:
    c89atomic_fetch_add_32(&pDataStream->executionPointer, 1);
    return result;
}

MA_API ma_result ma_resource_manager_process_job(ma_resource_manager* pResourceManager, ma_job* pJob)
{
    if (pResourceManager == NULL || pJob == NULL) {
        return MA_INVALID_ARGS;
    }

    switch (pJob->toc.code)
    {
        /* Data Buffer */
        case MA_JOB_LOAD_DATA_BUFFER: return ma_resource_manager_process_job__load_data_buffer(pResourceManager, pJob);
        case MA_JOB_FREE_DATA_BUFFER: return ma_resource_manager_process_job__free_data_buffer(pResourceManager, pJob);
        case MA_JOB_PAGE_DATA_BUFFER: return ma_resource_manager_process_job__page_data_buffer(pResourceManager, pJob);

        /* Data Stream */
        case MA_JOB_LOAD_DATA_STREAM: return ma_resource_manager_process_job__load_data_stream(pResourceManager, pJob);
        case MA_JOB_FREE_DATA_STREAM: return ma_resource_manager_process_job__free_data_stream(pResourceManager, pJob);
        case MA_JOB_PAGE_DATA_STREAM: return ma_resource_manager_process_job__page_data_stream(pResourceManager, pJob);
        case MA_JOB_SEEK_DATA_STREAM: return ma_resource_manager_process_job__seek_data_stream(pResourceManager, pJob);

        default: break;
    }

    /* Getting here means we don't know what the job code is and cannot do anything with it. */
    return MA_INVALID_OPERATION;
}

MA_API ma_result ma_resource_manager_process_next_job(ma_resource_manager* pResourceManager)
{
    ma_result result;
    ma_job job;

    if (pResourceManager == NULL) {
        return MA_INVALID_ARGS;
    }

    /* This will return MA_CANCELLED if the next job is a quit job. */
    result = ma_resource_manager_next_job(pResourceManager, &job);
    if (result != MA_SUCCESS) {
        return result;
    }

    return ma_resource_manager_process_job(pResourceManager, &job);
}





MA_API ma_panner_config ma_panner_config_init(ma_format format, ma_uint32 channels)
{
    ma_panner_config config;

    MA_ZERO_OBJECT(&config);
    config.format   = format;
    config.channels = channels;
    config.mode     = ma_pan_mode_balance;  /* Set to balancing mode by default because it's consistent with other audio engines and most likely what the caller is expecting. */
    config.pan      = 0;

    return config;
}


MA_API ma_result ma_panner_init(const ma_panner_config* pConfig, ma_panner* pPanner)
{
    if (pPanner == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pPanner);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    pPanner->format   = pConfig->format;
    pPanner->channels = pConfig->channels;
    pPanner->mode     = pConfig->mode;
    pPanner->pan      = pConfig->pan;

    return MA_SUCCESS;
}

static void ma_stereo_balance_pcm_frames_f32(float* pFramesOut, const float* pFramesIn, ma_uint64 frameCount, float pan)
{
    ma_uint64 iFrame;

    if (pan > 0) {
        float factor = 1.0f - pan;
        if (pFramesOut == pFramesIn) {
            for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
                pFramesOut[iFrame*2 + 0] = pFramesIn[iFrame*2 + 0] * factor;
            }
        } else {
            for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
                pFramesOut[iFrame*2 + 0] = pFramesIn[iFrame*2 + 0] * factor;
                pFramesOut[iFrame*2 + 1] = pFramesIn[iFrame*2 + 1];
            }
        }
    } else {
        float factor = 1.0f + pan;
        if (pFramesOut == pFramesIn) {
            for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
                pFramesOut[iFrame*2 + 1] = pFramesIn[iFrame*2 + 1] * factor;
            }
        } else {
            for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
                pFramesOut[iFrame*2 + 0] = pFramesIn[iFrame*2 + 0];
                pFramesOut[iFrame*2 + 1] = pFramesIn[iFrame*2 + 1] * factor;
            }
        }
    }
}

static void ma_stereo_balance_pcm_frames(void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount, ma_format format, float pan)
{
    if (pan == 0) {
        /* Fast path. No panning required. */
        if (pFramesOut == pFramesIn) {
            /* No-op */
        } else {
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, format, 2);
        }

        return;
    }

    switch (format) {
        case ma_format_f32: ma_stereo_balance_pcm_frames_f32((float*)pFramesOut, (float*)pFramesIn, frameCount, pan); break;

        /* Unknown format. Just copy. */
        default:
        {
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, format, 2);
        } break;
    }
}


static void ma_stereo_pan_pcm_frames_f32(float* pFramesOut, const float* pFramesIn, ma_uint64 frameCount, float pan)
{
    ma_uint64 iFrame;

    if (pan > 0) {
        float factorL0 = 1.0f - pan;
        float factorL1 = 0.0f + pan;

        for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
            float sample0 = (pFramesIn[iFrame*2 + 0] * factorL0);
            float sample1 = (pFramesIn[iFrame*2 + 0] * factorL1) + pFramesIn[iFrame*2 + 1];

            pFramesOut[iFrame*2 + 0] = sample0;
            pFramesOut[iFrame*2 + 1] = sample1;
        }
    } else {
        float factorR0 = 0.0f - pan;
        float factorR1 = 1.0f + pan;

        for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
            float sample0 = pFramesIn[iFrame*2 + 0] + (pFramesIn[iFrame*2 + 1] * factorR0);
            float sample1 =                           (pFramesIn[iFrame*2 + 1] * factorR1);

            pFramesOut[iFrame*2 + 0] = sample0;
            pFramesOut[iFrame*2 + 1] = sample1;
        }
    }
}

static void ma_stereo_pan_pcm_frames(void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount, ma_format format, float pan)
{
    if (pan == 0) {
        /* Fast path. No panning required. */
        if (pFramesOut == pFramesIn) {
            /* No-op */
        } else {
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, format, 2);
        }

        return;
    }

    switch (format) {
        case ma_format_f32: ma_stereo_pan_pcm_frames_f32((float*)pFramesOut, (float*)pFramesIn, frameCount, pan); break;

        /* Unknown format. Just copy. */
        default:
        {
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, format, 2);
        } break;
    }
}

MA_API ma_result ma_panner_process_pcm_frames(ma_panner* pPanner, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount)
{
    if (pPanner == NULL || pFramesOut == NULL || pFramesIn == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pPanner->channels == 2) {
        /* Stereo case. For now assume channel 0 is left and channel right is 1, but should probably add support for a channel map. */
        if (pPanner->mode == ma_pan_mode_balance) {
            ma_stereo_balance_pcm_frames(pFramesOut, pFramesIn, frameCount, pPanner->format, pPanner->pan);
        } else {
            ma_stereo_pan_pcm_frames(pFramesOut, pFramesIn, frameCount, pPanner->format, pPanner->pan);
        }
    } else {
        if (pPanner->channels == 1) {
            /* Panning has no effect on mono streams. */
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, pPanner->format, pPanner->channels);
        } else {
            /* For now we're not going to support non-stereo set ups. Not sure how I want to handle this case just yet. */
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, pPanner->format, pPanner->channels);
        }
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_panner_set_mode(ma_panner* pPanner, ma_pan_mode mode)
{
    if (pPanner == NULL) {
        return MA_INVALID_ARGS;
    }

    pPanner->mode = mode;

    return MA_SUCCESS;
}

MA_API ma_result ma_panner_set_pan(ma_panner* pPanner, float pan)
{
    if (pPanner == NULL) {
        return MA_INVALID_ARGS;
    }

    pPanner->pan = ma_clamp(pan, -1.0f, 1.0f);

    return MA_SUCCESS;
}




MA_API ma_spatializer_config ma_spatializer_config_init(ma_uint32 channelsIn, ma_uint32 channelsOut)
{
    ma_spatializer_config config;

    MA_ZERO_OBJECT(&config);

    config.channelsIn  = channelsIn;
    config.channelsOut = channelsOut;
    config.position    = ma_vec3f(0, 0, 0);
    config.rotation    = ma_quatf(0, 0, 0, 1);

    return config;
}


MA_API ma_result ma_spatializer_init(const ma_spatializer_config* pConfig, ma_spatializer* pSpatializer)
{
    if (pSpatializer == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pSpatializer);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    pSpatializer->channelsIn  = pConfig->channelsIn;
    pSpatializer->channelsOut = pConfig->channelsOut;
    pSpatializer->position    = pConfig->position;
    pSpatializer->rotation    = pConfig->rotation;

    return MA_SUCCESS;
}

MA_API ma_result ma_spatializer_process_pcm_frames(ma_spatializer* pSpatializer, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount)
{
    if (pSpatializer == NULL || pFramesOut == NULL || pFramesIn == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Spatialization is not yet implemented. However, do do need to do channel conversion here. */
    if (pSpatializer->channelsIn == pSpatializer->channelsOut) {
        ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, ma_format_f32, pSpatializer->channelsIn);
    } else {
        ma_convert_pcm_frames_channels_f32(pFramesOut, pSpatializer->channelsOut, pFramesIn, pSpatializer->channelsIn, frameCount);
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_spatializer_set_position(ma_spatializer* pSpatializer, ma_vec3 position)
{
    if (pSpatializer == NULL) {
        return MA_INVALID_ARGS;
    }

    pSpatializer->position = position;

    return MA_SUCCESS;
}

MA_API ma_result ma_spatializer_set_rotation(ma_spatializer* pSpatializer, ma_quat rotation)
{
    if (pSpatializer == NULL) {
        return MA_INVALID_ARGS;
    }

    pSpatializer->rotation = rotation;

    return MA_SUCCESS;
}



MA_API ma_fader_config ma_fader_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate)
{
    ma_fader_config config;

    MA_ZERO_OBJECT(&config);
    config.format     = format;
    config.channels   = channels;
    config.sampleRate = sampleRate;
    
    return config;
}


MA_API ma_result ma_fader_init(const ma_fader_config* pConfig, ma_fader* pFader)
{
    if (pFader == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pFader);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Only f32 is supported for now. */
    if (pConfig->format != ma_format_f32) {
        return MA_INVALID_ARGS;
    }

    pFader->config         = *pConfig;
    pFader->volumeBeg      = 1;
    pFader->volumeEnd      = 1;
    pFader->lengthInFrames = 0;
    pFader->cursorInFrames = 0;

    return MA_SUCCESS;
}

MA_API ma_result ma_fader_process_pcm_frames(ma_fader* pFader, void* pFramesOut, const void* pFramesIn, ma_uint64 frameCount)
{
    if (pFader == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Optimized path if volumeBeg and volumeEnd are equal. */
    if (pFader->volumeBeg == pFader->volumeEnd) {
        if (pFader->volumeBeg == 1) {
            /* Straight copy. */
            ma_copy_pcm_frames(pFramesOut, pFramesIn, frameCount, pFader->config.format, pFader->config.channels);
        } else {
            /* Copy with volume. */
            ma_volume_and_clip_pcm_frames(pFramesOut, pFramesIn, frameCount, pFader->config.format, pFader->config.channels, pFader->volumeEnd);
        }
    } else {
        /* Slower path. Volumes are different, so may need to do an interpolation. */
        if (pFader->cursorInFrames >= pFader->lengthInFrames) {
            /* Fast path. We've gone past the end of the fade period so just apply the end volume to all samples. */
            ma_volume_and_clip_pcm_frames(pFramesOut, pFramesIn, frameCount, pFader->config.format, pFader->config.channels, pFader->volumeEnd);
        } else {
            /* Slow path. This is where we do the actual fading. */
            ma_uint64 iFrame;
            ma_uint32 iChannel;

            /* For now we only support f32. Support for other formats will be added later. */
            if (pFader->config.format == ma_format_f32) {
                const float* pFramesInF32  = (const float*)pFramesIn;
                /* */ float* pFramesOutF32 = (      float*)pFramesOut;

                for (iFrame = 0; iFrame < frameCount; iFrame += 1) {
                    float a = ma_min(pFader->cursorInFrames + iFrame, pFader->lengthInFrames) / (float)pFader->lengthInFrames;
                    float volume = ma_mix_f32_fast(pFader->volumeBeg, pFader->volumeEnd, a);

                    for (iChannel = 0; iChannel < pFader->config.channels; iChannel += 1) {
                        pFramesOutF32[iFrame*pFader->config.channels + iChannel] = pFramesInF32[iFrame*pFader->config.channels + iChannel] * volume;
                    }
                }
            } else {
                return MA_NOT_IMPLEMENTED;
            }
        }
    }

    pFader->cursorInFrames += frameCount;

    return MA_SUCCESS;
}

MA_API ma_result ma_fader_get_data_format(const ma_fader* pFader, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    if (pFader == NULL) {
        return MA_INVALID_ARGS;
    }

    if (pFormat != NULL) {
        *pFormat = pFader->config.format;
    }

    if (pChannels != NULL) {
        *pChannels = pFader->config.channels;
    }

    if (pSampleRate != NULL) {
        *pSampleRate = pFader->config.sampleRate;
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_fader_set_fade(ma_fader* pFader, float volumeBeg, float volumeEnd, ma_uint64 lengthInFrames)
{
    if (pFader == NULL) {
        return MA_INVALID_ARGS;
    }

    /* If the volume is negative, use current volume. */
    if (volumeBeg < 0) {
        ma_fader_get_current_volume(pFader, &volumeBeg);
    }

    pFader->volumeBeg      = volumeBeg;
    pFader->volumeEnd      = volumeEnd;
    pFader->lengthInFrames = lengthInFrames;
    pFader->cursorInFrames = 0; /* Reset cursor. */

    return MA_SUCCESS;
}

MA_API ma_result ma_fader_get_current_volume(ma_fader* pFader, float* pVolume)
{
    if (pFader == NULL) {
        return MA_INVALID_ARGS;
    }

    /* The current volume depends on the position of the cursor. */
    if (pFader->cursorInFrames <= 0) {
        *pVolume = pFader->volumeBeg;
    } else if (pFader->cursorInFrames >= pFader->lengthInFrames) {
        *pVolume = pFader->volumeEnd;
    } else {
        /* The cursor is somewhere inside the fading period. We can figure this out with a simple linear interpoluation between volumeBeg and volumeEnd based on our cursor position. */
        *pVolume = ma_mix_f32_fast(pFader->volumeBeg, pFader->volumeEnd, pFader->cursorInFrames / (float)pFader->lengthInFrames);
    }

    return MA_SUCCESS;
}


/**************************************************************************************************************************************************************

Engine

**************************************************************************************************************************************************************/
#define MA_SEEK_TARGET_NONE (~(ma_uint64)0)


MA_API ma_engine_node_config ma_engine_node_config_init(ma_engine* pEngine, ma_engine_node_type type, ma_uint32 flags)
{
    ma_engine_node_config config;

    MA_ZERO_OBJECT(&config);
    config.pEngine         = pEngine;
    config.type            = type;
    config.isPitchDisabled = (flags & MA_SOUND_FLAG_DISABLE_PITCH) != 0;

    return config;
}


static void ma_engine_node_update_pitch_if_required(ma_engine_node* pEngineNode)
{
    MA_ASSERT(pEngineNode != NULL);

    if (pEngineNode->oldPitch != pEngineNode->pitch) {
        pEngineNode->oldPitch  = pEngineNode->pitch;
        ma_resampler_set_rate_ratio(&pEngineNode->resampler, pEngineNode->pitch);
    }
}

static ma_bool32 ma_engine_node_is_pitching_enabled(const ma_engine_node* pEngineNode)
{
    MA_ASSERT(pEngineNode != NULL);

    /* Don't try to be clever by skiping resampling in the pitch=1 case or else you'll glitch when moving away from 1. */
    return !pEngineNode->isPitchDisabled;
}

static ma_uint64 ma_engine_node_get_required_input_frame_count(const ma_engine_node* pEngineNode, ma_uint64 outputFrameCount)
{
    if (ma_engine_node_is_pitching_enabled(pEngineNode)) {
        return ma_resampler_get_required_input_frame_count(&pEngineNode->resampler, outputFrameCount);
    } else {
        return outputFrameCount;    /* No resampling, so 1:1. */
    }
}

static void ma_engine_node_process_pcm_frames__general(ma_engine_node* pEngineNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    ma_uint32 frameCountIn;
    ma_uint32 frameCountOut;
    ma_uint32 totalFramesProcessedIn;
    ma_uint32 totalFramesProcessedOut;
    ma_uint32 channelsIn;
    ma_uint32 channelsOut;
    ma_bool32 isPitchingEnabled;
    ma_bool32 isFadingEnabled;
    ma_bool32 isSpatializationEnabled;
    ma_bool32 isPanningEnabled;

    frameCountIn  = *pFrameCountIn;
    frameCountOut = *pFrameCountOut;
    
    channelsIn  = pEngineNode->spatializer.channelsIn;
    channelsOut = pEngineNode->spatializer.channelsOut;

    totalFramesProcessedIn  = 0;
    totalFramesProcessedOut = 0;

    isPitchingEnabled       = ma_engine_node_is_pitching_enabled(pEngineNode);
    isFadingEnabled         = pEngineNode->fader.volumeBeg != 1 || pEngineNode->fader.volumeEnd != 1;
    isSpatializationEnabled = pEngineNode->isSpatial;
    isPanningEnabled        = pEngineNode->panner.pan != 0 && channelsOut != 1;

    /* Keep going while we've still got data available for processing. */
    while (totalFramesProcessedIn < frameCountIn && totalFramesProcessedOut < frameCountOut) {
        /*
        We need to process in a specific order. We always do resampling first because it's likely
        we're going to be increasing the channel count after spatialization. Also, I want to do
        fading based on the output sample rate.

        We'll first read into a buffer from the resampler. Then we'll do all processing that
        operates on the on the input channel count. We'll then get the spatializer to output to
        the output buffer and then do all effects from that point directly in the output buffer
        in-place.

        Note that we're always running the resampler. If we try to be clever and skip resampling
        when the pitch is 1, we'll get a glitch when we move away from 1, back to 1, and then
        away from 1 again. We'll want to implement any pitch=1 optimizations in the resampler
        itself.

        There's a small optimization here that we'll utilize since it might be a fairly common
        case. When the input and output channel counts are the same, we'll read straight into the
        output buffer from the resampler and do everything in-place.
        */
        const float* pRunningFramesIn;
        float* pRunningFramesOut;
        float* pWorkingBuffer;   /* This is the buffer that we'll be processing frames in. This is in input channels. */
        float temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE / sizeof(float)];
        ma_uint32 tempCapInFrames = ma_countof(temp) / pEngineNode->spatializer.channelsIn;
        ma_uint32 framesAvailableIn;
        ma_uint32 framesAvailableOut;
        ma_uint32 framesJustProcessedIn;
        ma_uint32 framesJustProcessedOut;
        ma_bool32 isWorkingBufferValid = MA_FALSE;

        framesAvailableIn  = frameCountIn  - totalFramesProcessedIn;
        framesAvailableOut = frameCountOut - totalFramesProcessedOut;

        pRunningFramesIn  = ma_offset_pcm_frames_const_ptr_f32(ppFramesIn[0], totalFramesProcessedIn, channelsIn);
        pRunningFramesOut = ma_offset_pcm_frames_ptr_f32(ppFramesOut[0], totalFramesProcessedOut, channelsOut);

        if (channelsIn == channelsOut) {
            /* Fast path. Channel counts are the same. No need for an intermediary input buffer. */
            pWorkingBuffer = pRunningFramesOut;
        } else {
            /* Slow path. Channel counts are different. Need to use an intermediary input buffer. */
            pWorkingBuffer = temp;
            if (framesAvailableOut > tempCapInFrames) {
                framesAvailableOut = tempCapInFrames;
            }
        }

        /* First is resampler. */
        if (isPitchingEnabled) {
            ma_uint64 resampleFrameCountIn  = framesAvailableIn;
            ma_uint64 resampleFrameCountOut = framesAvailableOut;

            ma_resampler_process_pcm_frames(&pEngineNode->resampler, pRunningFramesIn, &resampleFrameCountIn, pWorkingBuffer, &resampleFrameCountOut);
            isWorkingBufferValid = MA_TRUE;

            framesJustProcessedIn  = (ma_uint32)resampleFrameCountIn;
            framesJustProcessedOut = (ma_uint32)resampleFrameCountOut;
        } else {
            framesJustProcessedIn  = framesAvailableIn;
            framesJustProcessedOut = framesAvailableOut;
        }

        /* Fading. */
        if (isFadingEnabled) {
            if (isWorkingBufferValid) {
                ma_fader_process_pcm_frames(&pEngineNode->fader, pWorkingBuffer, pWorkingBuffer, framesJustProcessedOut);   /* In-place processing. */
            } else {
                ma_fader_process_pcm_frames(&pEngineNode->fader, pWorkingBuffer, pRunningFramesIn, framesJustProcessedOut);
                isWorkingBufferValid = MA_TRUE;
            }
        }

        /*
        If at this point we still haven't actually done anything with the working buffer we need
        to just read straight from the input buffer.
        */
        if (isWorkingBufferValid == MA_FALSE) {
            pWorkingBuffer = (float*)pRunningFramesIn;  /* Naughty const cast, but it's safe at this point because we won't ever be writing to it from this point out. */
        }

        /* Spatialization. */
        if (isSpatializationEnabled) {
            ma_spatializer_process_pcm_frames(&pEngineNode->spatializer, pRunningFramesOut, pWorkingBuffer, framesJustProcessedOut);
        } else {
            /* No spatialization, but we still need to do channel conversion. */
            if (channelsIn == channelsOut) {
                /* No channel conversion required. Just copy straight to the output buffer. */
                ma_copy_pcm_frames(pRunningFramesOut, pWorkingBuffer, framesJustProcessedOut, ma_format_f32, channelsOut);
            } else {
                /* Channel conversion required. TODO: Add support for channel maps here. */
                ma_convert_pcm_frames_channels_f32(pRunningFramesOut, channelsOut, pWorkingBuffer, channelsIn, framesJustProcessedOut);
            }
        }

        /* At this point we can guarantee that the output buffer contains valid data. We can process everything in place now. */

        /* Panning. */
        if (isPanningEnabled) {
            ma_panner_process_pcm_frames(&pEngineNode->panner, pRunningFramesOut, pRunningFramesOut, framesJustProcessedOut);   /* In-place processing. */
        }

        /* We're done. */
        totalFramesProcessedIn  += framesJustProcessedIn;
        totalFramesProcessedOut += framesJustProcessedOut;
    }

    /* At this point we're done processing. */
    *pFrameCountIn  = totalFramesProcessedIn;
    *pFrameCountOut = totalFramesProcessedOut;
}

void ma_engine_node_process_pcm_frames__sound(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    /* For sounds, we need to first read from the data source. Then we need to apply the engine effects (pan, pitch, fades, etc.). */
    ma_result result = MA_SUCCESS;
    ma_sound* pSound = (ma_sound*)pNode;
    ma_uint32 frameCount = *pFrameCountOut;
    ma_uint32 totalFramesRead = 0;
    ma_format dataSourceFormat;
    ma_uint32 dataSourceChannels;
    ma_uint8 temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE];
    ma_uint32 tempCapInFrames;

    /* This is a data source node which means no input buses. */
    (void)ppFramesIn;
    (void)pFrameCountIn;

    /* If we're marked at the end we need to stop the sound and do nothing. */
    if (ma_sound_at_end(pSound)) {
        ma_sound_stop(pSound);
        *pFrameCountOut = 0;
        return;
    }

    /* If we're seeking, do so now before reading. */
    if (pSound->seekTarget != MA_SEEK_TARGET_NONE) {
        ma_data_source_seek_to_pcm_frame(pSound->pDataSource, pSound->seekTarget);
                
        /* Any time-dependant effects need to have their times updated. */
        ma_node_set_time(pSound, pSound->seekTarget);

        pSound->seekTarget  = MA_SEEK_TARGET_NONE;
    }

    /*
    For the convenience of the caller, we're doing to allow data sources to use non-floating-point formats and channel counts that differ
    from the main engine.
    */
    result = ma_data_source_get_data_format(pSound->pDataSource, &dataSourceFormat, &dataSourceChannels, NULL);
    if (result == MA_SUCCESS) {
        tempCapInFrames = sizeof(temp) / ma_get_bytes_per_frame(dataSourceFormat, dataSourceChannels);

        /* Keep reading until we've read as much as was requested or we reach the end of the data source. */
        while (totalFramesRead < frameCount) {
            ma_uint32 framesRemaining = frameCount - totalFramesRead;
            ma_uint32 framesToRead;
            ma_uint64 framesJustRead;
            ma_uint32 frameCountIn;
            ma_uint32 frameCountOut;
            float* pRunningFramesIn;
            float* pRunningFramesOut;

            /*
            The first thing we need to do is read into the temporary buffer. We can calculate exactly
            how many input frames we'll need after resampling.
            */
            framesToRead = (ma_uint32)ma_engine_node_get_required_input_frame_count(&pSound->engineNode, framesRemaining);
            if (framesToRead > tempCapInFrames) {
                framesToRead = tempCapInFrames;
            }

            result = ma_data_source_read_pcm_frames(pSound->pDataSource, temp, framesToRead, &framesJustRead, pSound->isLooping);

            /* If we reached the end of the sound we'll want to mark it as at the end and stop it. This should never be returned for looping sounds. */
            if (result == MA_AT_END) {
                c89atomic_exchange_8(&pSound->atEnd, MA_TRUE); /* This will be set to false in ma_sound_start(). */
            }

            pRunningFramesOut = ma_offset_pcm_frames_ptr_f32(ppFramesOut[0], totalFramesRead, ma_engine_get_channels(pSound->engineNode.pEngine));

            frameCountIn = (ma_uint32)framesJustRead;
            frameCountOut = framesRemaining;

            /* Convert if necessary. */
            if (dataSourceFormat == ma_format_f32) {
                /* Fast path. No data conversion necessary. */
                pRunningFramesIn = (float*)temp;
                ma_engine_node_process_pcm_frames__general(&pSound->engineNode, &pRunningFramesIn, &frameCountIn, &pRunningFramesOut, &frameCountOut);
            } else {
                /* Slow path. Need to do sample format conversion to f32. If we give the f32 buffer the same count as the first temp buffer, we're guaranteed it'll be large enough. */
                float tempf32[MA_DATA_CONVERTER_STACK_BUFFER_SIZE]; /* Do not do `MA_DATA_CONVERTER_STACK_BUFFER_SIZE/sizeof(float)` here like we've done in other places. */
                ma_convert_pcm_frames_format(tempf32, ma_format_f32, temp, dataSourceFormat, framesJustRead, dataSourceChannels, ma_dither_mode_none);

                /* Now that we have our samples in f32 format we can process like normal. */
                pRunningFramesIn = tempf32;
                ma_engine_node_process_pcm_frames__general(&pSound->engineNode, &pRunningFramesIn, &frameCountIn, &pRunningFramesOut, &frameCountOut);
            }

            /* We should have processed all of our input frames since we calculated the required number of input frames at the top. */
            MA_ASSERT(frameCountIn == framesJustRead);
            totalFramesRead += (ma_uint32)frameCountOut;   /* Safe cast. */

            if (result != MA_SUCCESS || ma_sound_at_end(pSound)) {
                break;  /* Might have reached the end. */
            }
        }
    }

    *pFrameCountOut = totalFramesRead;

    /*
    We want to update the pitch once, at the *end* of processing. If we don't force this to only
    ever be updating once, we could end up in a situation where retrieving the required input frame
    count ends up being different to what we actually retrieve. What could happen is that the
    required input frame count is calculated, the pitch is update, and then this processing function
    is called resulting in a different number of input frames being processed. Do not call this in
    ma_engine_node_process_pcm_frames__general() or else you'll hit the aforementioned bug.
    */
    ma_engine_node_update_pitch_if_required(&pSound->engineNode);
}

void ma_engine_node_process_pcm_frames__group(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
{
    /* For groups, the input data has already been read and we just need to apply the effect. */
    ma_engine_node_process_pcm_frames__general((ma_engine_node*)pNode, ppFramesIn, pFrameCountIn, ppFramesOut, pFrameCountOut);

    /*
    The pitch can only ever be updated once. We cannot update it in ma_engine_node_process_pcm_frames__general()
    because otherwise we'll introduce a subtle bug in ma_engine_node_process_pcm_frames__sound().
    */
    ma_engine_node_update_pitch_if_required((ma_engine_node*)pNode);
}


static ma_node_vtable g_ma_engine_node_vtable__sound =
{
    ma_engine_node_process_pcm_frames__sound,
    0,      /* Sounds are data source nodes which means they have zero inputs (their input is drawn from the data source itself). */
    1,      /* Sounds have one output bus. */
    0       /* Default flags. */
};

static ma_node_vtable g_ma_engine_node_vtable__group =
{
    ma_engine_node_process_pcm_frames__group,
    1,      /* Groups have one input bus. */
    1,      /* Groups have one output bus. */
    0       /* Default flags. */
};

MA_API ma_result ma_engine_node_init(const ma_engine_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_engine_node* pEngineNode)
{
    ma_result result;
    ma_node_config baseNodeConfig;
    ma_resampler_config resamplerConfig;
    ma_fader_config faderConfig;
    ma_spatializer_config spatializerConfig;
    ma_panner_config pannerConfig;

    if (pEngineNode == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pEngineNode);

    if (pConfig == NULL) {
        return MA_INVALID_ARGS; /* Config must be specified. */
    }

    if (pConfig->pEngine == NULL) {
        return MA_INVALID_ARGS; /* An engine must be specified. */
    }

    if (pConfig->type == ma_engine_node_type_sound) {
        /* Sound. */
        baseNodeConfig = ma_node_config_init(&g_ma_engine_node_vtable__sound, pConfig->channels, ma_engine_get_channels(pConfig->pEngine));
        baseNodeConfig.initialState = ma_node_state_stopped;    /* Sounds are stopped by default. */
    } else {
        /* Group. */
        baseNodeConfig = ma_node_config_init(&g_ma_engine_node_vtable__group, ma_engine_get_channels(pConfig->pEngine), ma_engine_get_channels(pConfig->pEngine));
        baseNodeConfig.initialState = ma_node_state_started;    /* Groups are started by default. */
    }

    result = ma_node_init(&pConfig->pEngine->nodeGraph, &baseNodeConfig, pAllocationCallbacks, &pEngineNode->baseNode);
    if (result != MA_SUCCESS) {
        goto error0;
    }

    pEngineNode->pEngine         = pConfig->pEngine;
    pEngineNode->pitch           = 1;
    pEngineNode->oldPitch        = 1;
    pEngineNode->isPitchDisabled = pConfig->isPitchDisabled;

    /*
    We can now initialize the effects we need in order to implement the engine node. There's a
    defined order of operations here, mainly centered around when we convert our channels from the
    data source's native channel count to the engine's channel count. As a rule, we want to do as
    much computation as possible before spatialization because there's a chance that will increase
    the channel count, thereby increasing the amount of work needing to be done to process.
    */

    /* We'll always do resampling first. */
    resamplerConfig = ma_resampler_config_init(ma_format_f32, baseNodeConfig.inputChannels[0], ma_engine_get_sample_rate(pEngineNode->pEngine), ma_engine_get_sample_rate(pEngineNode->pEngine), ma_resample_algorithm_linear);

    result = ma_resampler_init(&resamplerConfig, &pEngineNode->resampler);
    if (result != MA_SUCCESS) {
        goto error1;
    }


    /* After resampling will come the fader. */
    faderConfig = ma_fader_config_init(ma_format_f32, baseNodeConfig.inputChannels[0], pEngineNode->pEngine->sampleRate);

    result = ma_fader_init(&faderConfig, &pEngineNode->fader);
    if (result != MA_SUCCESS) {
        goto error2;
    }


    /* Spatialization comes next. Everything after this needs to use the engine's channel count. */
    spatializerConfig = ma_spatializer_config_init(baseNodeConfig.inputChannels[0], ma_engine_get_channels(pEngineNode->pEngine));
    
    result = ma_spatializer_init(&spatializerConfig, &pEngineNode->spatializer);
    if (result != MA_SUCCESS) {
        goto error2;
    }


    /*
    After spatialization comes panning. We need to do this after spatialization because otherwise we wouldn't
    be able to pan mono sounds. By doing it after spatialization, which converts the number of channels over
    to the engine's channel count, we can pan mono sounds.
    */
    pannerConfig = ma_panner_config_init(ma_format_f32, ma_engine_get_channels(pEngineNode->pEngine));

    result = ma_panner_init(&pannerConfig, &pEngineNode->panner);
    if (result != MA_SUCCESS) {
        goto error2;
    }

    return MA_SUCCESS;

error2: ma_resampler_uninit(&pEngineNode->resampler);
error1: ma_node_uninit(&pEngineNode->baseNode, pAllocationCallbacks);
error0: return result;
}

MA_API void ma_engine_node_uninit(ma_engine_node* pEngineNode, const ma_allocation_callbacks* pAllocationCallbacks)
{
    /*
    The base node always needs to be uninitialized first to ensure it's detached from the graph completely before we
    destroy anything that might be in the middle of being used by the processing function.
    */
    ma_node_uninit(&pEngineNode->baseNode, pAllocationCallbacks);

    /* Now that the node has been uninitialized we can safely uninitialize the rest. */
    ma_resampler_uninit(&pEngineNode->resampler);
    ma_node_uninit(&pEngineNode->baseNode, pAllocationCallbacks);
}

MA_API ma_result ma_engine_node_reset(ma_engine_node* pEngineNode)
{
    if (pEngineNode == NULL) {
        return MA_INVALID_ARGS;
    }

    /* TODO: Implement me. */

    return MA_SUCCESS;
}


static MA_INLINE ma_result ma_sound_stop_internal(ma_sound* pSound);
static MA_INLINE ma_result ma_sound_group_stop_internal(ma_sound_group* pGroup);

MA_API ma_engine_config ma_engine_config_init_default(void)
{
    ma_engine_config config;

    MA_ZERO_OBJECT(&config);

    return config;
}


static void ma_engine_data_callback_internal(ma_device* pDevice, void* pFramesOut, const void* pFramesIn, ma_uint32 frameCount)
{
    ma_engine_data_callback((ma_engine*)pDevice->pUserData, pFramesOut, pFramesIn, frameCount);
}

MA_API ma_result ma_engine_init(const ma_engine_config* pConfig, ma_engine* pEngine)
{
    ma_result result;
    ma_node_graph_config nodeGraphConfig;
    ma_engine_config engineConfig;
    ma_context_config contextConfig;

    if (pEngine != NULL) {
        MA_ZERO_OBJECT(pEngine);
    }

    /* The config is allowed to be NULL in which case we use defaults for everything. */
    if (pConfig != NULL) {
        engineConfig = *pConfig;
    } else {
        engineConfig = ma_engine_config_init_default();
    }

    pEngine->pResourceManager = engineConfig.pResourceManager;
    pEngine->pDevice          = engineConfig.pDevice;
    pEngine->sampleRate       = engineConfig.sampleRate;
    ma_allocation_callbacks_init_copy(&pEngine->allocationCallbacks, &engineConfig.allocationCallbacks);

    /* We need a context before we'll be able to create the default listener. */
    contextConfig = ma_context_config_init();
    contextConfig.allocationCallbacks = pEngine->allocationCallbacks;

    /* If we don't have a device, we need one. */
    if (pEngine->pDevice == NULL) {
        ma_device_config deviceConfig;

        pEngine->pDevice = (ma_device*)ma__malloc_from_callbacks(sizeof(*pEngine->pDevice), &pEngine->allocationCallbacks/*, MA_ALLOCATION_TYPE_CONTEXT*/);
        if (pEngine->pDevice == NULL) {
            return MA_OUT_OF_MEMORY;
        }

        deviceConfig = ma_device_config_init(ma_device_type_playback);
        deviceConfig.playback.pDeviceID       = engineConfig.pPlaybackDeviceID;
        deviceConfig.playback.channels        = engineConfig.channels;
        deviceConfig.sampleRate               = engineConfig.sampleRate;
        deviceConfig.dataCallback             = ma_engine_data_callback_internal;
        deviceConfig.pUserData                = pEngine;
        deviceConfig.periodSizeInFrames       = engineConfig.periodSizeInFrames;
        deviceConfig.periodSizeInMilliseconds = engineConfig.periodSizeInMilliseconds;
        deviceConfig.noPreZeroedOutputBuffer  = MA_TRUE;    /* We'll always be outputting to every frame in the callback so there's no need for a pre-silenced buffer. */
        deviceConfig.noClip                   = MA_TRUE;    /* The mixing engine will do clipping itself. */

        if (engineConfig.pContext == NULL) {
            result = ma_device_init_ex(NULL, 0, &contextConfig, &deviceConfig, pEngine->pDevice);
        } else {
            result = ma_device_init(engineConfig.pContext, &deviceConfig, pEngine->pDevice);
        }

        if (result != MA_SUCCESS) {
            ma__free_from_callbacks(pEngine->pDevice, &pEngine->allocationCallbacks/*, MA_ALLOCATION_TYPE_CONTEXT*/);
            pEngine->pDevice = NULL;
            return result;
        }

        pEngine->ownsDevice = MA_TRUE;
    }


    /* The engine is a node graph. This needs to be initialized after we have the device so we can can determine the channel count. */
    nodeGraphConfig = ma_node_graph_config_init(pEngine->pDevice->playback.channels);

    result = ma_node_graph_init(&nodeGraphConfig, &pEngine->allocationCallbacks, &pEngine->nodeGraph);
    if (result != MA_SUCCESS) {
        goto on_error_1;
    }

    /* Now that have the default listener we can ensure we have the format, channels and sample rate set to proper values to ensure future listeners are configured consistently. */
    pEngine->sampleRate = pEngine->pDevice->sampleRate;


    /* We need a resource manager. */
#ifndef MA_NO_RESOURCE_MANAGER
    if (pEngine->pResourceManager == NULL) {
        ma_resource_manager_config resourceManagerConfig;

        pEngine->pResourceManager = (ma_resource_manager*)ma__malloc_from_callbacks(sizeof(*pEngine->pResourceManager), &pEngine->allocationCallbacks);
        if (pEngine->pResourceManager == NULL) {
            result = MA_OUT_OF_MEMORY;
            goto on_error_2;
        }

        resourceManagerConfig = ma_resource_manager_config_init();
        resourceManagerConfig.decodedFormat     = ma_format_f32;
        resourceManagerConfig.decodedChannels   = 0;  /* Leave the decoded channel count as 0 so we can get good spatialization. */
        resourceManagerConfig.decodedSampleRate = pEngine->sampleRate;
        ma_allocation_callbacks_init_copy(&resourceManagerConfig.allocationCallbacks, &pEngine->allocationCallbacks);
        resourceManagerConfig.pVFS              = engineConfig.pResourceManagerVFS;

        result = ma_resource_manager_init(&resourceManagerConfig, pEngine->pResourceManager);
        if (result != MA_SUCCESS) {
            goto on_error_3;
        }

        pEngine->ownsResourceManager = MA_TRUE;
    }
#endif

    /* Setup some stuff for inlined sounds. That is sounds played with ma_engine_play_sound(). */
    ma_mutex_init(&pEngine->inlinedSoundLock);
    pEngine->pInlinedSoundHead = NULL;

    /* Start the engine if required. This should always be the last step. */
    if (engineConfig.noAutoStart == MA_FALSE) {
        result = ma_engine_start(pEngine);
        if (result != MA_SUCCESS) {
            goto on_error_4;    /* Failed to start the engine. */
        }
    }

    return MA_SUCCESS;

on_error_4:
    ma_mutex_uninit(&pEngine->inlinedSoundLock);
#ifndef MA_NO_RESOURCE_MANAGER
on_error_3:
    if (pEngine->ownsResourceManager) {
        ma__free_from_callbacks(pEngine->pResourceManager, &pEngine->allocationCallbacks);
    }
on_error_2:
    ma_node_graph_uninit(&pEngine->nodeGraph, &pEngine->allocationCallbacks);
#endif  /* MA_NO_RESOURCE_MANAGER */
on_error_1:
    if (pEngine->ownsDevice) {
        ma_device_uninit(pEngine->pDevice);
        ma__free_from_callbacks(pEngine->pDevice, &pEngine->allocationCallbacks/*, MA_ALLOCATION_TYPE_CONTEXT*/);
    }

    return result;
}

MA_API void ma_engine_uninit(ma_engine* pEngine)
{
    if (pEngine == NULL) {
        return;
    }

    /* The device must be uninitialized before the node graph to ensure the audio thread doesn't try accessing it. */
    if (pEngine->ownsDevice) {
        ma_device_uninit(pEngine->pDevice);
        ma__free_from_callbacks(pEngine->pDevice, &pEngine->allocationCallbacks/*, MA_ALLOCATION_TYPE_CONTEXT*/);
    }

    /*
    All inlined sounds need to be deleted. I'm going to use a lock here just to future proof in case
    I want to do some kind of garbage collection later on.
    */
    ma_mutex_lock(&pEngine->inlinedSoundLock);
    {
        for (;;) {
            ma_sound_inlined* pSoundToDelete = pEngine->pInlinedSoundHead;
            if (pSoundToDelete == NULL) {
                break;  /* Done. */
            }

            pEngine->pInlinedSoundHead = pSoundToDelete->pNext;

            ma_sound_uninit(&pSoundToDelete->sound);
            ma_free(pSoundToDelete, &pEngine->allocationCallbacks);
        }
    }
    ma_mutex_unlock(&pEngine->inlinedSoundLock);
    ma_mutex_uninit(&pEngine->inlinedSoundLock);


    /* Make sure the node graph is uninitialized after the audio thread has been shutdown to prevent accessing of the node graph after being uninitialized. */
    ma_node_graph_uninit(&pEngine->nodeGraph, &pEngine->allocationCallbacks);

    /* Uninitialize the resource manager last to ensure we don't have a thread still trying to access it. */
#ifndef MA_NO_RESOURCE_MANAGER
    if (pEngine->ownsResourceManager) {
        ma_resource_manager_uninit(pEngine->pResourceManager);
        ma__free_from_callbacks(pEngine->pResourceManager, &pEngine->allocationCallbacks);
    }
#endif
}

MA_API ma_result ma_engine_read_pcm_frames(ma_engine* pEngine, void* pFramesOut, ma_uint32 frameCount, ma_uint32* pFramesRead)
{
    return ma_node_graph_read_pcm_frames(&pEngine->nodeGraph, pFramesOut, frameCount, pFramesRead);
}

MA_API void ma_engine_data_callback(ma_engine* pEngine, void* pFramesOut, const void* pFramesIn, ma_uint32 frameCount)
{
    (void)pFramesIn;    /* Unused. */

    ma_engine_read_pcm_frames(pEngine, pFramesOut, frameCount, NULL);
}

MA_API ma_node* ma_engine_get_endpoint(ma_engine* pEngine)
{
    return ma_node_graph_get_endpoint(&pEngine->nodeGraph);
}

MA_API ma_uint64 ma_engine_get_time(const ma_engine* pEngine)
{
    return ma_node_graph_get_time(&pEngine->nodeGraph);
}

MA_API ma_uint32 ma_engine_get_channels(const ma_engine* pEngine)
{
    return ma_node_graph_get_channels(&pEngine->nodeGraph);
}

MA_API ma_uint32 ma_engine_get_sample_rate(const ma_engine* pEngine)
{
    return pEngine->sampleRate;
}


MA_API ma_result ma_engine_start(ma_engine* pEngine)
{
    ma_result result;

    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    result = ma_device_start(pEngine->pDevice);
    if (result != MA_SUCCESS) {
        return result;
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_engine_stop(ma_engine* pEngine)
{
    ma_result result;

    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    result = ma_device_stop(pEngine->pDevice);
    if (result != MA_SUCCESS) {
        return result;
    }

    return MA_SUCCESS;
}

MA_API ma_result ma_engine_set_volume(ma_engine* pEngine, float volume)
{
    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_device_set_master_volume(pEngine->pDevice, volume);
}

MA_API ma_result ma_engine_set_gain_db(ma_engine* pEngine, float gainDB)
{
    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_device_set_master_gain_db(pEngine->pDevice, gainDB);
}


MA_API ma_result ma_engine_listener_set_position(ma_engine* pEngine, ma_vec3 position)
{
    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    pEngine->listener.position = position;

    return MA_SUCCESS;
}

MA_API ma_result ma_engine_listener_set_rotation(ma_engine* pEngine, ma_quat rotation)
{
    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    pEngine->listener.rotation = rotation;

    return MA_SUCCESS;
}


MA_API ma_result ma_engine_play_sound_ex(ma_engine* pEngine, const char* pFilePath, ma_node* pNode, ma_uint32 nodeInputBusIndex)
{
    ma_result result = MA_SUCCESS;
    ma_sound_inlined* pSound = NULL;
    ma_sound_inlined* pNextSound = NULL;

    if (pEngine == NULL || pFilePath == NULL) {
        return MA_INVALID_ARGS;
    }

    /* Attach to the endpoint node if nothing is specicied. */
    if (pNode == NULL) {
        pNode = ma_node_graph_get_endpoint(&pEngine->nodeGraph);
        nodeInputBusIndex = 0;
    }

    /*
    We want to check if we can recycle an already-allocated inlined sound. Since this is just a
    helper I'm not *too* concerned about performance here and I'm happy to use a lock to keep
    the implementation simple. Maybe this can be optimized later if there's enough demand, but
    if this function is being used it probably means the caller doesn't really care too much.
    
    What we do is check the atEnd flag. When this is true, we can recycle the sound. Otherwise
    we just keep iterating. If we reach the end without finding a sound to recycle we just
    allocate a new one. This doesn't scale well for a massive number of sounds being played
    simultaneously as we don't ever actually free the sound objects. Some kind of garbage
    collection routine might be valuable for this which I'll think about.
    */
    ma_mutex_lock(&pEngine->inlinedSoundLock);
    {
        ma_uint32 dataSourceFlags = 0;

        for (pNextSound = pEngine->pInlinedSoundHead; pNextSound != NULL; pNextSound = pNextSound->pNext) {
            if (c89atomic_load_8(&pNextSound->sound.atEnd)) {
                /*
                The sound is at the end which means it's available for recycling. All we need to do
                is uninitialize it and reinitialize it. All we're doing is recycling memory.
                */
                pSound = pNextSound;
                c89atomic_fetch_sub_32(&pEngine->inlinedSoundCount, 1);
                break;
            }
        }

        if (pSound != NULL) {
            /*
            We actually want to detach the sound from the list here. The reason is because we want the sound
            to be in a consistent state at the non-recycled case to simplify the logic below.
            */
            if (pSound->pPrev != NULL) {
                pSound->pPrev->pNext = pSound->pNext;
            }
            if (pSound->pNext != NULL) {
                pSound->pNext->pPrev = pSound->pPrev;
            }

            /* Now the previous sound needs to be uninitialized. */
            ma_sound_uninit(&pNextSound->sound);
        } else {
            /* No sound available for recycling. Allocate one now. */
            pSound = ma_malloc(sizeof(*pSound), &pEngine->allocationCallbacks);
        }

        if (pSound != NULL) {   /* Safety check for the allocation above. */
            /*
            At this point we should have memory allocated for the inlined sound. We just need
            to initialize it like a normal sound now.
            */
            dataSourceFlags |= MA_SOUND_FLAG_ASYNC;                 /* For inlined sounds we don't want to be sitting around waiting for stuff to load so force an async load. */
            dataSourceFlags |= MA_SOUND_FLAG_NO_DEFAULT_ATTACHMENT; /* We want specific control over where the sound is attached in the graph. We'll attach it manually just before playing the sound. */

            result = ma_sound_init_from_file(pEngine, pFilePath, dataSourceFlags, NULL, NULL, &pSound->sound);
            if (result == MA_SUCCESS) {
                /* Now attach the sound to the graph. */
                result = ma_node_attach_output_bus(pSound, 0, pNode, nodeInputBusIndex);
                if (result == MA_SUCCESS) {
                    /* At this point the sound should be loaded and we can go ahead and add it to the list. The new item becomes the new head. */
                    pSound->pNext = pEngine->pInlinedSoundHead;
                    pSound->pPrev = NULL;

                    pEngine->pInlinedSoundHead = pSound;    /* <-- This is what attaches the sound to the list. */
                    if (pSound->pNext != NULL) {
                        pSound->pNext->pPrev = pSound;
                    }
                } else {
                    ma_free(pSound, &pEngine->allocationCallbacks);
                }
            } else {
                ma_free(pSound, &pEngine->allocationCallbacks);
            }
        } else {
            result = MA_OUT_OF_MEMORY;
        }
    }
    ma_mutex_unlock(&pEngine->inlinedSoundLock);

    /* Finally we can start playing the sound. */
    result = ma_sound_start(&pSound->sound);
    if (result != MA_SUCCESS) {
        /* Failed to start the sound. We need to mark it for recycling and return an error. */
        pSound->sound.atEnd = MA_TRUE;
        return result;
    }

    c89atomic_fetch_add_32(&pEngine->inlinedSoundCount, 1);
    return result;
}

MA_API ma_result ma_engine_play_sound(ma_engine* pEngine, const char* pFilePath, ma_sound_group* pGroup)
{
    return ma_engine_play_sound_ex(pEngine, pFilePath, pGroup, 0);
}


static ma_result ma_sound_preinit(ma_engine* pEngine, ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pSound);

    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    return MA_SUCCESS;
}

static ma_result ma_sound_init_from_data_source_internal(ma_engine* pEngine, ma_data_source* pDataSource, ma_uint32 flags, ma_sound_group* pGroup, ma_sound* pSound)
{
    ma_result result;
    ma_engine_node_config engineNodeConfig;

    /* Do not clear pSound to zero here - that's done at a higher level with ma_sound_preinit(). */
    MA_ASSERT(pEngine != NULL);
    MA_ASSERT(pSound  != NULL);

    if (pDataSource == NULL) {
        return MA_INVALID_ARGS;
    }

    pSound->pDataSource = pDataSource;

    /*
    Sounds are engine nodes. Before we can initialize this we need to determine the channel count.
    If we can't do this we need to abort. It's up to the caller to ensure they're using a data
    source that provides this information upfront.
    */
    engineNodeConfig = ma_engine_node_config_init(pEngine, ma_engine_node_type_sound, flags);

    result = ma_data_source_get_data_format(pDataSource, NULL, &engineNodeConfig.channels, NULL);
    if (result != MA_SUCCESS) {
        return result;  /* Failed to retrieve the channel count. */
    }

    if (engineNodeConfig.channels == 0) {
        return MA_INVALID_OPERATION;    /* Invalid channel count. */
    }

    /* Getting here means we should have a valid channel count and we can initialize the engine node. */
    result = ma_engine_node_init(&engineNodeConfig, &pEngine->allocationCallbacks, &pSound->engineNode);
    if (result != MA_SUCCESS) {
        return result;
    }

    /* If no group is specified, attach the sound straight to the endpoint. */
    if (pGroup == NULL) {
        /* No group. Attach straight to the endpoint by default, unless the caller has requested that do not. */
        if ((flags & MA_SOUND_FLAG_NO_DEFAULT_ATTACHMENT) == 0) {
            result = ma_node_attach_output_bus(pSound, 0, ma_node_graph_get_endpoint(&pEngine->nodeGraph), 0);
        }
    } else {
        /* A group is specified. Attach to it by default. The sound has only a single output bus, and the group has a single input bus which makes attachment trivial. */
        result = ma_node_attach_output_bus(pSound, 0, pGroup, 0);
    }

    if (result != MA_SUCCESS) {
        ma_engine_node_uninit(&pSound->engineNode, &pEngine->allocationCallbacks);
        return result;
    }

    return MA_SUCCESS;
}

#ifndef MA_NO_RESOURCE_MANAGER
MA_API ma_result ma_sound_init_from_file(ma_engine* pEngine, const char* pFilePath, ma_uint32 flags, ma_async_notification* pNotification, ma_sound_group* pGroup, ma_sound* pSound)
{
    ma_result result;

    result = ma_sound_preinit(pEngine, pSound);
    if (result != MA_SUCCESS) {
        return result;
    }

    /*
    The engine requires knowledge of the channel count of the underlying data source before it can
    initialize the sound. Therefore, we need to make the resource manager wait until initialization
    of the underlying data source to be initialized so we can get access to the channel count. To
    do this, the MA_DATA_SOURCE_FLAG_WAIT_INIT is forced.

    Because we're initializing the data source before the sound, there's a chance the notification
    will get triggered before this function returns. This is OK, so long as the caller is aware of
    it and can avoid accessing the sound from within the notification.
    */
    result = ma_resource_manager_data_source_init(pEngine->pResourceManager, pFilePath, flags | MA_DATA_SOURCE_FLAG_WAIT_INIT, pNotification, &pSound->resourceManagerDataSource);
    if (result != MA_SUCCESS) {
        return result;
    }

    pSound->ownsDataSource = MA_TRUE;

    result = ma_sound_init_from_data_source_internal(pEngine, &pSound->resourceManagerDataSource, flags, pGroup, pSound);
    if (result != MA_SUCCESS) {
        ma_resource_manager_data_source_uninit(&pSound->resourceManagerDataSource);
        MA_ZERO_OBJECT(pSound);
        return result;
    }

    return MA_SUCCESS;
}
#endif

MA_API ma_result ma_sound_init_from_data_source(ma_engine* pEngine, ma_data_source* pDataSource, ma_uint32 flags, ma_sound_group* pGroup, ma_sound* pSound)
{
    ma_result result;

    result = ma_sound_preinit(pEngine, pSound);
    if (result != MA_SUCCESS) {
        return result;
    }

    pSound->ownsDataSource = MA_FALSE;

    result = ma_sound_init_from_data_source_internal(pEngine, pDataSource, flags, pGroup, pSound);
    if (result != MA_SUCCESS) {
        return result;
    }

    return MA_SUCCESS;
}

MA_API void ma_sound_uninit(ma_sound* pSound)
{
    if (pSound == NULL) {
        return;
    }

    /*
    Always uninitialize the node first. This ensures it's detached from the graph and does not return until it has done
    so which makes thread safety beyond this point trivial.
    */
    ma_node_uninit(pSound, &pSound->engineNode.pEngine->allocationCallbacks);

    /* Once the sound is detached from the group we can guarantee that it won't be referenced by the mixer thread which means it's safe for us to destroy the data source. */
#ifndef MA_NO_RESOURCE_MANAGER
    if (pSound->ownsDataSource) {
        ma_resource_manager_data_source_uninit(&pSound->resourceManagerDataSource);
        pSound->pDataSource = NULL;
    }
#else
    MA_ASSERT(pSound->ownsDataSource == MA_FALSE);
#endif
}

MA_API ma_result ma_sound_start(ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    /* If the sound is already playing, do nothing. */
    if (ma_sound_is_playing(pSound)) {
        return MA_SUCCESS;
    }

    /* If the sound is at the end it means we want to start from the start again. */
    if (ma_sound_at_end(pSound)) {
        ma_result result = ma_data_source_seek_to_pcm_frame(pSound->pDataSource, 0);
        if (result != MA_SUCCESS) {
            return result;  /* Failed to seek back to the start. */
        }

        /* Make sure we clear the end indicator. */
        c89atomic_exchange_8(&pSound->atEnd, MA_FALSE);
    }

    /* Make sure the sound is started. If there's a start delay, the sound won't actually start until the start time is reached. */
    ma_node_set_state(pSound, ma_node_state_started);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_stop(ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    /* This will stop the sound immediately. Use ma_sound_set_stop_time() to stop the sound at a specific time. */
    ma_node_set_state(pSound, ma_node_state_stopped);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_set_volume(ma_sound* pSound, float volume)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    /* The volume is controlled via the output bus. */
    ma_node_set_output_bus_volume(pSound, 0, volume);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_set_gain_db(ma_sound* pSound, float gainDB)
{
    return ma_sound_set_volume(pSound, ma_gain_db_to_factor(gainDB));
}

MA_API ma_result ma_sound_set_pitch(ma_sound* pSound, float pitch)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    pSound->engineNode.pitch = pitch;

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_set_pan(ma_sound* pSound, float pan)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_panner_set_pan(&pSound->engineNode.panner, pan);
}

MA_API ma_result ma_sound_set_pan_mode(ma_sound* pSound, ma_pan_mode pan_mode)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_panner_set_mode(&pSound->engineNode.panner, pan_mode);
}

MA_API ma_result ma_sound_set_position(ma_sound* pSound, ma_vec3 position)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_spatializer_set_position(&pSound->engineNode.spatializer, position);
}

MA_API ma_result ma_sound_set_rotation(ma_sound* pSound, ma_quat rotation)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_spatializer_set_rotation(&pSound->engineNode.spatializer, rotation);
}

MA_API ma_result ma_sound_set_looping(ma_sound* pSound, ma_bool8 isLooping)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    c89atomic_exchange_8(&pSound->isLooping, isLooping);

    /*
    This is a little bit of a hack, but basically we need to set the looping flag at the data source level if we are running a data source managed by
    the resource manager, and that is backed by a data stream. The reason for this is that the data stream itself needs to be aware of the looping
    requirements so that it can do seamless loop transitions. The better solution for this is to add ma_data_source_set_looping() and just call this
    generically.
    */
#ifndef MA_NO_RESOURCE_MANAGER
    if (pSound->pDataSource == &pSound->resourceManagerDataSource) {
        ma_resource_manager_data_source_set_looping(&pSound->resourceManagerDataSource, isLooping);
    }
#endif

    return MA_SUCCESS;
}

MA_API ma_bool32 ma_sound_is_looping(const ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_FALSE;
    }

    return c89atomic_load_32((ma_bool32*)&pSound->isLooping);
}


MA_API ma_result ma_sound_set_fade_in_frames(ma_sound* pSound, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInFrames)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_fader_set_fade(&pSound->engineNode.fader, volumeBeg, volumeEnd, fadeLengthInFrames);
}

MA_API ma_result ma_sound_set_fade_in_milliseconds(ma_sound* pSound, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInMilliseconds)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_sound_set_fade_in_frames(pSound, volumeBeg, volumeEnd, (fadeLengthInMilliseconds * pSound->engineNode.fader.config.sampleRate) / 1000);
}

MA_API ma_result ma_sound_get_current_fade_volume(ma_sound* pSound, float* pVolume)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_fader_get_current_volume(&pSound->engineNode.fader, pVolume);
}

MA_API ma_result ma_sound_set_start_time(ma_sound* pSound, ma_uint64 absoluteGlobalTimeInFrames)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_node_set_state_time(pSound, ma_node_state_started, absoluteGlobalTimeInFrames);
}

MA_API ma_result ma_sound_set_stop_time(ma_sound* pSound, ma_uint64 absoluteGlobalTimeInFrames)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_node_set_state_time(pSound, ma_node_state_stopped, absoluteGlobalTimeInFrames);
}

MA_API ma_bool32 ma_sound_is_playing(const ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_FALSE;
    }

    return ma_node_get_state(pSound) == ma_node_state_started;
}

MA_API ma_bool32 ma_sound_at_end(const ma_sound* pSound)
{
    if (pSound == NULL) {
        return MA_FALSE;
    }

    return c89atomic_load_8((ma_bool8*)&pSound->atEnd);
}

MA_API ma_result ma_sound_get_time_in_frames(const ma_sound* pSound, ma_uint64* pTimeInFrames)
{
    if (pTimeInFrames == NULL) {
        return MA_INVALID_ARGS;
    }

    *pTimeInFrames = 0;

    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    *pTimeInFrames = ma_node_get_time(pSound);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_seek_to_pcm_frame(ma_sound* pSound, ma_uint64 frameIndex)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    /*
    Resource manager data sources are thread safe which means we can just seek immediately. However, we cannot guarantee that other data sources are
    thread safe as well so in that case we'll need to get the mixing thread to seek for us to ensure we don't try seeking at the same time as reading.
    */
#ifndef MA_NO_RESOURCE_MANAGER
    if (pSound->pDataSource == &pSound->resourceManagerDataSource) {
        ma_result result = ma_resource_manager_data_source_seek_to_pcm_frame(&pSound->resourceManagerDataSource, frameIndex);
        if (result != MA_SUCCESS) {
            return result;
        }

        /* Time dependant effects need to have their timers updated. */
        return ma_node_set_time(&pSound->engineNode, frameIndex);
    }
#endif

    /* Getting here means the data source is not a resource manager data source so we'll need to get the mixing thread to do the seeking for us. */
    pSound->seekTarget = frameIndex;

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_get_data_format(ma_sound* pSound, ma_format* pFormat, ma_uint32* pChannels, ma_uint32* pSampleRate)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_data_source_get_data_format(pSound->pDataSource, pFormat, pChannels, pSampleRate);
}

MA_API ma_result ma_sound_get_cursor_in_pcm_frames(ma_sound* pSound, ma_uint64* pCursor)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_data_source_get_cursor_in_pcm_frames(pSound->pDataSource, pCursor);
}

MA_API ma_result ma_sound_get_length_in_pcm_frames(ma_sound* pSound, ma_uint64* pLength)
{
    if (pSound == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_data_source_get_length_in_pcm_frames(pSound->pDataSource, pLength);
}


MA_API ma_result ma_sound_group_init(ma_engine* pEngine, ma_uint32 flags, ma_sound_group* pParentGroup, ma_sound_group* pGroup)
{
    ma_result result;
    ma_engine_node_config engineNodeConfig;

    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    MA_ZERO_OBJECT(pGroup);

    if (pEngine == NULL) {
        return MA_INVALID_ARGS;
    }

    /* A sound group is just an engine node. */
    engineNodeConfig = ma_engine_node_config_init(pEngine, ma_engine_node_type_group, flags);
    
    result = ma_engine_node_init(&engineNodeConfig, &pEngine->allocationCallbacks, &pGroup->engineNode);
    if (result != MA_SUCCESS) {
        return result;
    }

    /* Attach the engine node to the graph if requested. */
    if (pParentGroup == NULL) {
        /* No parent group specified. Attach to the endpoint by default. */
        if ((flags & MA_SOUND_FLAG_NO_DEFAULT_ATTACHMENT) == 0) {
            ma_node_attach_output_bus(pGroup, 0, ma_node_graph_get_endpoint(&pEngine->nodeGraph), 0);
        }
    } else {
        /* Parent group specified. Attach to it's first endpoint. */
        ma_node_attach_output_bus(pGroup, 0, pParentGroup, 0);
    }

    return MA_SUCCESS;
}

MA_API void ma_sound_group_uninit(ma_sound_group* pGroup)
{
    if (pGroup == NULL) {
        return;
    }

    /*
    First thing to do is uninitialize the node. This will wait until the group is completely detached
    which makes the parts below trivial with respect to thread-safety.
    */
    ma_node_uninit(pGroup, &pGroup->engineNode.pEngine->allocationCallbacks);
}

MA_API ma_result ma_sound_group_start(ma_sound_group* pGroup)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    /* This won't actually start the group if a start delay has been applied. */
    ma_node_set_state(pGroup, ma_node_state_started);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_group_stop(ma_sound_group* pGroup)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    /* This will stop the group immediately. Use ma_sound_group_set_stop_time() to delay stopping to a specific time. */
    ma_node_set_state(pGroup, ma_node_state_stopped);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_group_set_volume(ma_sound_group* pGroup, float volume)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    /* The volume is controlled via the output bus on the node. */
    ma_node_set_output_bus_volume(pGroup, 0, volume);

    return MA_SUCCESS;
}

MA_API ma_result ma_sound_group_set_gain_db(ma_sound_group* pGroup, float gainDB)
{
    return ma_sound_group_set_volume(pGroup, ma_gain_db_to_factor(gainDB));
}

MA_API ma_result ma_sound_group_set_pan(ma_sound_group* pGroup, float pan)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_panner_set_pan(&pGroup->engineNode.panner, pan);
}

MA_API ma_result ma_sound_group_set_pitch(ma_sound_group* pGroup, float pitch)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    pGroup->engineNode.pitch = pitch;

    return MA_SUCCESS;
}


MA_API ma_result ma_sound_group_set_fade_in_frames(ma_sound_group* pGroup, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInFrames)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_fader_set_fade(&pGroup->engineNode.fader, volumeBeg, volumeEnd, fadeLengthInFrames);
}

MA_API ma_result ma_sound_group_set_fade_in_milliseconds(ma_sound_group* pGroup, float volumeBeg, float volumeEnd, ma_uint64 fadeLengthInMilliseconds)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_sound_group_set_fade_in_frames(pGroup, volumeBeg, volumeEnd, (fadeLengthInMilliseconds * pGroup->engineNode.fader.config.sampleRate) / 1000);
}

MA_API ma_result ma_sound_group_get_current_fade_volume(ma_sound_group* pGroup, float* pVolume)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_fader_get_current_volume(&pGroup->engineNode.fader, pVolume);
}

MA_API ma_result ma_sound_group_set_start_time(ma_sound_group* pGroup, ma_uint64 absoluteGlobalTimeInFrames)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_node_set_state_time(pGroup, ma_node_state_started, absoluteGlobalTimeInFrames);
}

MA_API ma_result ma_sound_group_set_stop_time(ma_sound_group* pGroup, ma_uint64 absoluteGlobalTimeInFrames)
{
    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    return ma_node_set_state_time(pGroup, ma_node_state_stopped, absoluteGlobalTimeInFrames);
}

MA_API ma_bool32 ma_sound_group_is_playing(const ma_sound_group* pGroup)
{
    if (pGroup == NULL) {
        return MA_FALSE;
    }

    return ma_node_get_state(pGroup) == ma_node_state_started;
}

MA_API ma_result ma_sound_group_get_time_in_frames(const ma_sound_group* pGroup, ma_uint64* pTimeInFrames)
{
    if (pTimeInFrames == NULL) {
        return MA_INVALID_ARGS;
    }

    *pTimeInFrames = 0;

    if (pGroup == NULL) {
        return MA_INVALID_ARGS;
    }

    *pTimeInFrames = ma_node_get_time(pGroup);

    return MA_SUCCESS;
}


#endif
