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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

CQTexperiment
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;