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Gave the audio queue something a lot like a spin lock on waiting to pipe out audio.

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This commit is contained in:
Thomas Harte 2016-01-18 19:57:18 -06:00
parent 127684c590
commit 03f683d588
1 changed files with 24 additions and 13 deletions
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37
OSBindings/Mac/Clock Signal/Wrappers/AudioQueue.m
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@ -140,21 +140,32 @@ static void audioOutputCallback(
- (void)enqueueAudioBuffer:(const int16_t *)buffer numberOfSamples:(size_t)lengthInSamples
{
[_writeLock lockWhenCondition:AudioQueueCanWrite];
size_t samplesBeforeOverflow = AudioQueueStreamLength - (_audioStreamWritePosition % AudioQueueStreamLength);
if(samplesBeforeOverflow < lengthInSamples)
while(1)
{
memcpy(&_audioStream[_audioStreamWritePosition % AudioQueueStreamLength], buffer, samplesBeforeOverflow * sizeof(int16_t));
memcpy(&_audioStream[0], &buffer[samplesBeforeOverflow], (lengthInSamples - samplesBeforeOverflow) * sizeof(int16_t));
}
else
{
memcpy(&_audioStream[_audioStreamWritePosition % AudioQueueStreamLength], buffer, lengthInSamples * sizeof(int16_t));
}
[_writeLock lockWhenCondition:AudioQueueCanWrite];
if((_audioStreamReadPosition + AudioQueueStreamLength) - _audioStreamWritePosition >= lengthInSamples)
{
size_t samplesBeforeOverflow = AudioQueueStreamLength - (_audioStreamWritePosition % AudioQueueStreamLength);
_audioStreamWritePosition += lengthInSamples;
[_writeLock unlockWithCondition:[self writeLockCondition]];
if(samplesBeforeOverflow < lengthInSamples)
{
memcpy(&_audioStream[_audioStreamWritePosition % AudioQueueStreamLength], buffer, samplesBeforeOverflow * sizeof(int16_t));
memcpy(&_audioStream[0], &buffer[samplesBeforeOverflow], (lengthInSamples - samplesBeforeOverflow) * sizeof(int16_t));
}
else
{
memcpy(&_audioStream[_audioStreamWritePosition % AudioQueueStreamLength], buffer, lengthInSamples * sizeof(int16_t));
}
_audioStreamWritePosition += lengthInSamples;
[_writeLock unlockWithCondition:[self writeLockCondition]];
break;
}
else
{
[_writeLock unlockWithCondition:AudioQueueWait];
}
}
}
- (NSInteger)writeLockCondition