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Do a better job of keeping the queue populated.

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This commit is contained in:
Thomas Harte 2022-07-11 20:50:02 -04:00
parent f2fb9cf596
commit a1544f3033
1 changed files with 9 additions and 7 deletions
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16
OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
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@ -42,10 +42,10 @@ static NSLock *CSAudioQueueDeallocLock;
[_storedBuffersLock lock];
const int buffers = atomic_fetch_add(&_enqueuedBuffers, -1);
// If that leaves nothing in the queue, re-enqueue whatever just came back in order to keep the
// queue going. AudioQueues seem to stop playing and never restart no matter how much encouragement
// if exhausted.
if(!buffers) {
// If that suggests the queue may be exhausted soon, re-enqueue whatever just came back in order to
// keep the queue going. AudioQueues seem to stop playing and never restart no matter how much
// encouragement if exhausted.
if(buffers == 1) {
AudioQueueEnqueueBuffer(theAudioQueue, buffer, 0, NULL);
atomic_fetch_add(&_enqueuedBuffers, 1);
} else {
@ -73,7 +73,7 @@ static void audioOutputCallback(
}
- (BOOL)isRunningDry {
return atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed) < 2;
return atomic_load_explicit(&_enqueuedBuffers, memory_order_relaxed) < 3;
}
#pragma mark - Standard object lifecycle
@ -167,7 +167,7 @@ static void audioOutputCallback(
[_storedBuffersLock unlock];
return;
}
atomic_fetch_add(&_enqueuedBuffers, 1);
const int enqueuedBuffers = atomic_fetch_add(&_enqueuedBuffers, 1);
AudioQueueBufferRef newBuffer;
AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes * 2, &newBuffer);
@ -179,7 +179,9 @@ static void audioOutputCallback(
// 'Start' the queue. This is documented to be a no-op if the queue is already started,
// and it's better to defer starting it until at least some data is available.
AudioQueueStart(_audioQueue, NULL);
if(enqueuedBuffers > 3) {
AudioQueueStart(_audioQueue, NULL);
}
}
#pragma mark - Sampling Rate getters