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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
+17 -1
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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))) #if (__EMSCRIPTEN_major__ > 3) || (__EMSCRIPTEN_major__ == 3 && (__EMSCRIPTEN_minor__ > 1 || (__EMSCRIPTEN_minor__ == 1 && __EMSCRIPTEN_tiny__ >= 32)))
#include <emscripten/webaudio.h> #include <emscripten/webaudio.h>
#define MA_SUPPORT_AUDIO_WORKLETS #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 #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 Unfortunately the audio data is not interleaved so we'll need to convert it before we give the data to miniaudio
for further processing. 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) { if (ma_device_get_state(pDevice) != ma_device_state_started) {
/* Fill the output buffer with zero to avoid a noise sound */ /* 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 Now that we know the channel count to use we can allocate the intermediary buffer. The
intermediary buffer is used for interleaving and deinterleaving. intermediary buffer is used for interleaving and deinterleaving.
*/ */
#if defined(MA_SUPPORT_AUDIO_WORKLETS_VARIABLE_BUFFER_SIZE)
{
intermediaryBufferSizeInFrames = (size_t)emscripten_audio_context_quantum_size(audioContext);
}
#else
{
intermediaryBufferSizeInFrames = 128; intermediaryBufferSizeInFrames = 128;
}
#endif
pParameters->pDevice->webaudio.pIntermediaryBuffer = (float*)ma_malloc(intermediaryBufferSizeInFrames * (ma_uint32)channels * sizeof(float), &pParameters->pDevice->pContext->allocationCallbacks); pParameters->pDevice->webaudio.pIntermediaryBuffer = (float*)ma_malloc(intermediaryBufferSizeInFrames * (ma_uint32)channels * sizeof(float), &pParameters->pDevice->pContext->allocationCallbacks);
if (pParameters->pDevice->webaudio.pIntermediaryBuffer == NULL) { if (pParameters->pDevice->webaudio.pIntermediaryBuffer == NULL) {