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Web Audio: Add support for variable buffer sizes to Audio Worklets.

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Support for this was added to Emscripten 3.1.70. Currently only
querying the quantum size is supported. I believe support for
configuring the quantum size is coming later in Web Audio 1.1.

Compilation with versions of Emscripten earlier than 3.1.70 is still
supported.
This commit is contained in:
David Reid
2025-01-11 10:17:20 +10:00
parent b53daca554
commit ae2cd4bea4
1 changed files with 18 additions and 2 deletions
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miniaudio.h
+18 -2
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@@ -39857,6 +39857,10 @@ Web Audio Backend
#if (__EMSCRIPTEN_major__ > 3) || (__EMSCRIPTEN_major__ == 3 && (__EMSCRIPTEN_minor__ > 1 || (__EMSCRIPTEN_minor__ == 1 && __EMSCRIPTEN_tiny__ >= 32)))
#include <emscripten/webaudio.h>
#define MA_SUPPORT_AUDIO_WORKLETS
#if (__EMSCRIPTEN_major__ > 3) || (__EMSCRIPTEN_major__ == 3 && (__EMSCRIPTEN_minor__ > 1 || (__EMSCRIPTEN_minor__ == 1 && __EMSCRIPTEN_tiny__ >= 70)))
#define MA_SUPPORT_AUDIO_WORKLETS_VARIABLE_BUFFER_SIZE
#endif
#endif
/*
@@ -40112,7 +40116,11 @@ static EM_BOOL ma_audio_worklet_process_callback__webaudio(int inputCount, const
Unfortunately the audio data is not interleaved so we'll need to convert it before we give the data to miniaudio
for further processing.
*/
frameCount = 128;
if (pDevice->type == ma_device_type_playback) {
frameCount = pDevice->playback.internalPeriodSizeInFrames;
} else {
frameCount = pDevice->capture.internalPeriodSizeInFrames;
}
if (ma_device_get_state(pDevice) != ma_device_state_started) {
/* Fill the output buffer with zero to avoid a noise sound */
@@ -40199,7 +40207,15 @@ static void ma_audio_worklet_processor_created__webaudio(EMSCRIPTEN_WEBAUDIO_T a
Now that we know the channel count to use we can allocate the intermediary buffer. The
intermediary buffer is used for interleaving and deinterleaving.
*/
intermediaryBufferSizeInFrames = 128;
#if defined(MA_SUPPORT_AUDIO_WORKLETS_VARIABLE_BUFFER_SIZE)
{
intermediaryBufferSizeInFrames = (size_t)emscripten_audio_context_quantum_size(audioContext);
}
#else
{
intermediaryBufferSizeInFrames = 128;
}
#endif
pParameters->pDevice->webaudio.pIntermediaryBuffer = (float*)ma_malloc(intermediaryBufferSizeInFrames * (ma_uint32)channels * sizeof(float), &pParameters->pDevice->pContext->allocationCallbacks);
if (pParameters->pDevice->webaudio.pIntermediaryBuffer == NULL) {