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Merge pull request #60 from TomHarte/SilentAudio
Introduces a reuse list for Mac audio buffers
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commit
cf5685abf3
@ -10,10 +10,13 @@
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@import AudioToolbox;
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#define AudioQueueBufferMaxLength 8192
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#define NumberOfStoredAudioQueueBuffer 16
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@implementation CSAudioQueue
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{
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AudioQueueRef _audioQueue;
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AudioQueueBufferRef _storedBuffers[NumberOfStoredAudioQueueBuffer];
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}
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#pragma mark - AudioQueue callbacks
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@ -21,6 +24,19 @@
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- (void)audioQueue:(AudioQueueRef)theAudioQueue didCallbackWithBuffer:(AudioQueueBufferRef)buffer
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{
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[self.delegate audioQueueIsRunningDry:self];
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@synchronized(self)
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{
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for(int c = 0; c < NumberOfStoredAudioQueueBuffer; c++)
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{
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if(!_storedBuffers[c] || buffer->mAudioDataBytesCapacity > _storedBuffers[c]->mAudioDataBytesCapacity)
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{
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if(_storedBuffers[c]) AudioQueueFreeBuffer(_audioQueue, _storedBuffers[c]);
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_storedBuffers[c] = buffer;
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return;
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}
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}
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}
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AudioQueueFreeBuffer(_audioQueue, buffer);
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}
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@ -95,14 +111,30 @@ static void audioOutputCallback(
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- (void)enqueueAudioBuffer:(const int16_t *)buffer numberOfSamples:(size_t)lengthInSamples
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{
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AudioQueueBufferRef newBuffer;
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size_t bufferBytes = lengthInSamples * sizeof(int16_t);
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AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes, &newBuffer);
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memcpy(newBuffer->mAudioData, buffer, bufferBytes);
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newBuffer->mAudioDataByteSize = (UInt32)bufferBytes;
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@synchronized(self)
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{
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for(int c = 0; c < NumberOfStoredAudioQueueBuffer; c++)
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{
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if(_storedBuffers[c] && _storedBuffers[c]->mAudioDataBytesCapacity >= bufferBytes)
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{
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memcpy(_storedBuffers[c]->mAudioData, buffer, bufferBytes);
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_storedBuffers[c]->mAudioDataByteSize = (UInt32)bufferBytes;
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AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL);
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AudioQueueEnqueueBuffer(_audioQueue, _storedBuffers[c], 0, NULL);
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_storedBuffers[c] = NULL;
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return;
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}
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}
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AudioQueueBufferRef newBuffer;
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AudioQueueAllocateBuffer(_audioQueue, (UInt32)bufferBytes * 2, &newBuffer);
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memcpy(newBuffer->mAudioData, buffer, bufferBytes);
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newBuffer->mAudioDataByteSize = (UInt32)bufferBytes;
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AudioQueueEnqueueBuffer(_audioQueue, newBuffer, 0, NULL);
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}
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}
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#pragma mark - Sampling Rate getters
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