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CoreAudio output: Fix buffer underruns on output that could result in buffer looping in CoreAudio, by feeding silence from the callback instead of returning incomplete or possibly empty buffers

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Christopher Snowhill 2021-12-25 19:43:10 -08:00
parent 098650099e
commit c6b112f512
1 changed files with 10 additions and 1 deletions
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11
Audio/Output/OutputCoreAudio.m
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@ -59,8 +59,17 @@ static OSStatus Sound_Renderer(void *inRefCon, AudioUnitRenderActionFlags *ioAc
amountRead2 = [output->outputController readData:(readPointer+amountRead) amount:amountToRead-amountRead];
amountRead += amountRead2;
}
if (amountRead < amountToRead)
{
// Either underrun, or no data at all. Caller output tends to just
// buffer loop if it doesn't get anything, so always produce a full
// buffer, and silence anything we couldn't supply.
memset(readPointer + amountRead, 0, amountToRead - amountRead);
amountRead = amountToRead;
}
ioData->mBuffers[0].mDataByteSize = amountRead;
//ioData->mBuffers[0].mDataByteSize = amountRead;
ioData->mBuffers[0].mNumberChannels = output->deviceFormat.mChannelsPerFrame;
ioData->mNumberBuffers = 1;