Public issue https://github.com/mackron/miniaudio/issues/667

This is still not working on my machine. The device will initialize and
run, but the captured data is always silent for some reason. I have
been unable to figure out how to make this work.

This commit allows initialization of the device to complete at the very
least.

Public issue https://github.com/mackron/miniaudio/issues/484

Public issue https://github.com/mackron/miniaudio/issues/660

The issue here is that it's possible for miniaudio to attempt to access
data from a WAVEFORMATEXTENSIBLE structure when the object is actually
only a WAVEFORMATEX structure which is smaller which can therefore
result in trying to access unallocated memory.

Public issue https://github.com/mackron/miniaudio/issues/660

Public issue https://github.com/mackron/miniaudio/issues/659

This is set via the engine config.

Smoothing is disabled by default. To enable it, you must use
ma_sound_init_ex() and configure it via the volumeSmoothTimeInPCMFrames
member of ma_sound_config.

This commit also fixes a bug where ma_gainer is not properly applying
smoothing.

This is an attempt to work around an issue with PipeWire.

Public issue https://github.com/mackron/miniaudio/issues/652

This example captures data from the microphone using the low-level API
and then plays back the data through the engine. The intermediary data
source is a ring buffer.