Initial working implementation of full-duplex on WASAPI.

examples/simple_capture.c

-// This example simply captures data from your default microphone until you press Enter, after
-// which it plays back the captured audio.
+// This example simply captures data from your default microphone until you press Enter. The output is saved to the file specified on the command line.
 
 #define MINI_AL_IMPLEMENTATION
 #include "../mini_al.h"
 
+#define DR_WAV_IMPLEMENTATION
+#include "../extras/dr_wav.h"
+
 #include <stdlib.h>
 #include <stdio.h>
 
-
-mal_uint32 capturedSampleCount = 0;
-mal_int16* pCapturedSamples = NULL;
-mal_uint32 playbackSample = 0;
-
-void on_recv_frames(mal_device* pDevice, void* pOutput, const void* pInput, mal_uint32 frameCount)
+void data_callback(mal_device* pDevice, void* pOutput, const void* pInput, mal_uint32 frameCount)
 {
-    mal_uint32 sampleCount = frameCount * pDevice->channels;
-
-    mal_uint32 newCapturedSampleCount = capturedSampleCount + sampleCount;
-    mal_int16* pNewCapturedSamples = (mal_int16*)realloc(pCapturedSamples, newCapturedSampleCount * sizeof(mal_int16));
-    if (pNewCapturedSamples == NULL) {
-        return;
-    }
-
-    memcpy(pNewCapturedSamples + capturedSampleCount, pInput, sampleCount * sizeof(mal_int16));
-
-    pCapturedSamples = pNewCapturedSamples;
-    capturedSampleCount = newCapturedSampleCount;
-
     (void)pOutput;
+    
+    drwav* pWav = (drwav*)pDevice->pUserData;
+    mal_assert(pWav != NULL);
+
+    drwav_write_pcm_frames(pWav, frameCount, pInput);
 }
 
-void on_send_frames(mal_device* pDevice, void* pOutput, const void* pInput, mal_uint32 frameCount)
+int main(int argc, char** argv)
 {
-    mal_uint32 samplesToRead = frameCount * pDevice->channels;
-    if (samplesToRead > capturedSampleCount-playbackSample) {
-        samplesToRead = capturedSampleCount-playbackSample;
-    }
-
-    if (samplesToRead == 0) {
-        return;
+    if (argc < 2) {
+        printf("No input file.\n");
+        return -1;
     }
 
-    memcpy(pOutput, pCapturedSamples + playbackSample, samplesToRead * sizeof(mal_int16));
-    playbackSample += samplesToRead;
-
-    (void)pInput;
-}
+    mal_result result;
 
-int main()
-{
-    mal_device_config config;
+    drwav_data_format wavFormat;
+    wavFormat.container     = drwav_container_riff;
+    wavFormat.format        = DR_WAVE_FORMAT_IEEE_FLOAT;
+    wavFormat.channels      = 2;
+    wavFormat.sampleRate    = 44100;
+    wavFormat.bitsPerSample = 32;
 
-    mal_context context;
-    if (mal_context_init(NULL, 0, NULL, &context) != MAL_SUCCESS) {
-        printf("Failed to initialize context.");
+    drwav wav;
+    if (drwav_init_file_write(&wav, argv[1], &wavFormat) == DRWAV_FALSE) {
+        printf("Failed to initialize output file.\n");
         return -1;
     }
 
-    printf("Recording...\n");
-    config = mal_device_config_init(mal_format_s16, 2, 48000, on_recv_frames, NULL);
-    mal_device captureDevice;
-    if (mal_device_init(&context, mal_device_type_capture, NULL, &config, &captureDevice) != MAL_SUCCESS) {
-        mal_context_uninit(&context);
+    mal_device_config config = mal_device_config_init(mal_device_type_capture);
+    config.capture.format   = mal_format_f32;
+    config.capture.channels = wavFormat.channels;
+    config.sampleRate       = wavFormat.sampleRate;
+    config.dataCallback     = data_callback;
+    config.pUserData        = &wav;
+
+    mal_device device;
+    result = mal_device_init(NULL, &config, &device);
+    if (result != MAL_SUCCESS) {
         printf("Failed to initialize capture device.\n");
         return -2;
     }
 
-    if (mal_device_start(&captureDevice) != MAL_SUCCESS) {
-        mal_device_uninit(&captureDevice);
-        mal_context_uninit(&context);
-        printf("Failed to start capture device.\n");
+    result = mal_device_start(&device);
+    if (result != MAL_SUCCESS) {
+        mal_device_uninit(&device);
+        printf("Failed to start device.\n");
         return -3;
     }
 
     printf("Press Enter to stop recording...\n");
     getchar();
+    
+    mal_device_uninit(&device);
+    drwav_uninit(&wav);
 
-    mal_device_uninit(&captureDevice);
-
-
-
-    printf("Playing...\n");
-    config = mal_device_config_init(mal_format_s16, 2, 48000, on_send_frames, NULL);
-    mal_device playbackDevice;
-    if (mal_device_init(&context, mal_device_type_playback, NULL, &config, &playbackDevice) != MAL_SUCCESS) {
-        mal_context_uninit(&context);
-        printf("Failed to initialize playback device.\n");
-        return -4;
-    }
-
-    if (mal_device_start(&playbackDevice) != MAL_SUCCESS) {
-        mal_device_uninit(&playbackDevice);
-        mal_context_uninit(&context);
-        printf("Failed to start playback device.\n");
-        return -5;
-    }
-
-    printf("Press Enter to quit...\n");
-    getchar();
-
-    mal_device_uninit(&playbackDevice);
-
-    mal_context_uninit(&context);
     return 0;
 }
\ No newline at end of file

tests/mal_duplex.c

@@ -3,6 +3,9 @@
 #define MINI_AL_IMPLEMENTATION
 #include "../mini_al.h"
 
+#define DR_WAV_IMPLEMENTATION
+#include "../extras/dr_wav.h"
+
 void log_callback(mal_context* pContext, mal_device* pDevice, mal_uint32 logLevel, const char* message)
 {
     (void)pContext;
@@ -21,14 +24,31 @@ void data_callback(mal_device* pDevice, void* pOutput, const void* pInput, mal_u
 {
     /* In this test the format and channel count are the same for both input and output which means we can just memcpy(). */
     mal_copy_memory(pOutput, pInput, frameCount * mal_get_bytes_per_frame(pDevice->format, pDevice->channels));
+
+    /* Also write to a wav file for debugging. */
+    drwav* pWav = (drwav*)pDevice->pUserData;
+    mal_assert(pWav != NULL);
+
+    drwav_write_pcm_frames(pWav, frameCount, pInput);
 }
 
 int main(int argc, char** argv)
 {
     mal_result result;
 
-    (void)argc;
-    (void)argv;
+    drwav_data_format wavFormat;
+    wavFormat.container     = drwav_container_riff;
+    wavFormat.format        = DR_WAVE_FORMAT_IEEE_FLOAT;
+    wavFormat.channels      = 2;
+    wavFormat.sampleRate    = 44100;
+    wavFormat.bitsPerSample = 32;
+
+    drwav wav;
+    if (drwav_init_file_write(&wav, "output.wav", &wavFormat) == DRWAV_FALSE) {
+        printf("Failed to initialize output file.\n");
+        return -1;
+    }
+    
 
     mal_backend backend = mal_backend_wasapi;
 
@@ -43,16 +63,18 @@ int main(int argc, char** argv)
     }
 
     mal_device_config deviceConfig = mal_device_config_init(mal_device_type_duplex);
-    deviceConfig.pPlaybackDeviceID = NULL;
-    deviceConfig.format = mal_format_f32;
-    deviceConfig.channels = 2;
-    deviceConfig.sampleRate = 44100;
-    deviceConfig.bufferSizeInMilliseconds = 50;
-    deviceConfig.periods = 3;
-    deviceConfig.shareMode = mal_share_mode_shared;
-    deviceConfig.dataCallback = data_callback;
-    deviceConfig.stopCallback = stop_callback;
-    deviceConfig.pUserData = NULL;
+    deviceConfig.capture.pDeviceID  = NULL;
+    deviceConfig.capture.format     = mal_format_f32;
+    deviceConfig.capture.channels   = 2;
+    deviceConfig.playback.pDeviceID = NULL;
+    deviceConfig.playback.format    = mal_format_f32;
+    deviceConfig.playback.channels  = 2;
+    deviceConfig.sampleRate         = 44100;
+    deviceConfig.bufferSizeInMilliseconds = 1000;
+    deviceConfig.periods            = 3;
+    deviceConfig.dataCallback       = data_callback;
+    deviceConfig.stopCallback       = stop_callback;
+    deviceConfig.pUserData          = &wav;
 
     mal_device device;
     result = mal_device_init(&context, &deviceConfig, &device);
@@ -66,5 +88,9 @@ int main(int argc, char** argv)
     getchar();
 
     mal_device_uninit(&device);
+    drwav_uninit(&wav);
+
+    (void)argc;
+    (void)argv;
     return 0;
 }
\ No newline at end of file

tests/mal_test_0.vcxproj

@@ -272,11 +272,11 @@
     </ClCompile>
     <ClCompile Include="..\examples\simple_capture.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\examples\simple_enumeration.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
@@ -319,7 +319,7 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="mal_duplex.c">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">true</ExcludedFromBuild>
@@ -359,12 +359,12 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="mal_test_0.c">
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">false</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">false</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
-      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="mal_test_0.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
@@ -386,6 +386,7 @@
   <ItemGroup>
     <ClInclude Include="..\mini_al.h" />
     <ClInclude Include="..\research\mal_resampler.h" />
+    <ClInclude Include="..\research\mal_ring_buffer.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

tests/mal_test_0.vcxproj.filters

@@ -68,5 +68,8 @@
     <ClInclude Include="..\research\mal_resampler.h">
       <Filter>Source Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\research\mal_ring_buffer.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file