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Libretro: Add back missing audio overkill (fixes #2734)

This commit is contained in:
Vicki Pfau 2022-11-29 02:20:02 -08:00
parent 9c69b86d71
commit 71d1f122f9
1 changed files with 33 additions and 0 deletions
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33
src/platform/libretro/libretro.c
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@ -617,6 +617,39 @@ void retro_run(void) {
core->desiredVideoDimensions(core, &width, &height); core->desiredVideoDimensions(core, &width, &height);
videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256); videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
#ifdef M_CORE_GBA
if (core->platform(core) == mPLATFORM_GBA) {
blip_t *audioChannelLeft = core->getAudioChannel(core, 0);
blip_t *audioChannelRight = core->getAudioChannel(core, 1);
int samplesAvail = blip_samples_avail(audioChannelLeft);
if (samplesAvail > 0) {
/* Update 'running average' of number of
* samples per frame.
* Note that this is not a true running
* average, but just a leaky-integrator/
* exponential moving average, used because
* it is simple and fast (i.e. requires no
* window of samples). */
audioSamplesPerFrameAvg = (SAMPLES_PER_FRAME_MOVING_AVG_ALPHA * (float)samplesAvail) +
((1.0f - SAMPLES_PER_FRAME_MOVING_AVG_ALPHA) * audioSamplesPerFrameAvg);
size_t samplesToRead = (size_t)(audioSamplesPerFrameAvg);
/* Resize audio output buffer, if required */
if (audioSampleBufferSize < (samplesToRead * 2)) {
audioSampleBufferSize = (samplesToRead * 2);
audioSampleBuffer = realloc(audioSampleBuffer, audioSampleBufferSize * sizeof(int16_t));
}
int produced = blip_read_samples(audioChannelLeft, audioSampleBuffer, samplesToRead, true);
blip_read_samples(audioChannelRight, audioSampleBuffer + 1, samplesToRead, true);
if (produced > 0) {
if (audioLowPassEnabled) {
_audioLowPassFilter(audioSampleBuffer, produced);
}
audioCallback(audioSampleBuffer, (size_t)produced);
}
}
}
#endif
if (rumbleCallback) { if (rumbleCallback) {
if (rumbleUp) { if (rumbleUp) {
rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleUp * 0xFFFF / (rumbleUp + rumbleDown)); rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleUp * 0xFFFF / (rumbleUp + rumbleDown));