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Merge pull request #60 from TomHarte/SilentAudio

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Introduces a reuse list for Mac audio buffers
This commit is contained in:
Thomas Harte 2016-10-23 21:27:13 -04:00 committed by GitHub
commit cf5685abf3
1 changed files with 37 additions and 5 deletions
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42
OSBindings/Mac/Clock Signal/Audio/CSAudioQueue.m
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@ -10,10 +10,13 @@
@import AudioToolbox;
#define AudioQueueBufferMaxLength 8192
#define NumberOfStoredAudioQueueBuffer 16
@implementation CSAudioQueue
{
AudioQueueRef _audioQueue;
AudioQueueBufferRef _storedBuffers[NumberOfStoredAudioQueueBuffer];
}
#pragma mark - AudioQueue callbacks
@ -21,6 +24,19 @@
- (void)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer
{
[self.delegate audioQueueIsRunningDry:self];
@synchronized(self)
{
for(int c = 0; c < NumberOfStoredAudioQueueBuffer; c++)
{
if(!_storedBuffers[c] || buffer->mAudioDataBytesCapacity > _storedBuffers[c]->mAudioDataBytesCapacity)
{
if(_storedBuffers[c]) AudioQueueFreeBuffer(_audioQueue, _storedBuffers[c]);
_storedBuffers[c] = buffer;
return;
}
}
}
AudioQueueFreeBuffer(_audioQueue, buffer);
}
@ -95,14 +111,30 @@ static void audioOutputCallback(
- (void)enqueueAudioBuffer:(const int16_t *)buffer numberOfSamples:(size_t)lengthInSamples
{
AudioQueueBufferRef newBuffer;
size_t bufferBytes = lengthInSamples * sizeof(int16_t);
AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes, &newBuffer);
memcpy(newBuffer->mAudioData, buffer, bufferBytes);
newBuffer->mAudioDataByteSize = (UInt32)bufferBytes;
@synchronized(self)
{
for(int c = 0; c < NumberOfStoredAudioQueueBuffer; c++)
{
if(_storedBuffers[c] && _storedBuffers[c]->mAudioDataBytesCapacity >= bufferBytes)
{
memcpy(_storedBuffers[c]->mAudioData, buffer, bufferBytes);
_storedBuffers[c]->mAudioDataByteSize = (UInt32)bufferBytes;
AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL);
AudioQueueEnqueueBuffer(_audioQueue, _storedBuffers[c], 0, NULL);
_storedBuffers[c] = NULL;
return;
}
}
AudioQueueBufferRef newBuffer;
AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes * 2, &newBuffer);
memcpy(newBuffer->mAudioData, buffer, bufferBytes);
newBuffer->mAudioDataByteSize = (UInt32)bufferBytes;
AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL);
}
}
#pragma mark - Sampling Rate getters