AudioQueueAllocateBuffer no allocation

[allb4u]

Hi

I'm trying to use the Audio Queue API to play out linear PCM audio received over the net.

I create an audio queue and then try to allocate the first buffer. The allocation call returns OK but the buffer data space isn't allocated.

Can anyone see what I'm doing wrong?

aQState->bufferSize = 4800;

AudioStreamBasicDescription* desc = &aQState->audioDataFormat;
desc->mSampleRate = 48000;
desc->mFormatID = kAudioFormatLinearPCM;
desc->mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
desc->mBytesPerPacket = 2;
desc->mFramesPerPacket = 1;
desc->mBytesPerFrame = 2;
desc->mChannelsPerFrame = 1;
desc->mBitsPerChannel = 16;
	
OSStatus result = AudioQueueNewOutput( &aQState->audioDataFormat, 
                               audioPlayCallBack, 
                               &aQState,
                               NULL,
                               kCFRunLoopCommonModes,
                               0,
                               &aQState->audioQueue );
//result is 0 OK so far	
	
for (int i =0; i < numAudioBuffers; i++) {
		
  result = AudioQueueAllocateBuffer( aQState->audioQueue, 
                               aQState->bufferSize, 
                               &aQState->audioBuffers[i] );			
  // again result 0 OK
		
  AudioQueueBufferRef thisBuf = aQState->audioBuffers[1];
		
  /* problem is here thisBuf->mAudioData is 0 so no data space 
      has been allocated*/
 }

[allb4u]

Hi

My mistake. Was checking audioBuffers[1] not audioBuffers[i] which wouldn't have worked on the first run of my loop.

Thanks

Originally Posted by allb4u

Hi

I'm trying to use the Audio Queue API to play out linear PCM audio received over the net.

I create an audio queue and then try to allocate the first buffer. The allocation call returns OK but the buffer data space isn't allocated.

Can anyone see what I'm doing wrong?

aQState->bufferSize = 4800;

AudioStreamBasicDescription* desc = &aQState->audioDataFormat;
desc->mSampleRate = 48000;
desc->mFormatID = kAudioFormatLinearPCM;
desc->mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
desc->mBytesPerPacket = 2;
desc->mFramesPerPacket = 1;
desc->mBytesPerFrame = 2;
desc->mChannelsPerFrame = 1;
desc->mBitsPerChannel = 16;
	
OSStatus result = AudioQueueNewOutput( &aQState->audioDataFormat, 
                               audioPlayCallBack, 
                               &aQState,
                               NULL,
                               kCFRunLoopCommonModes,
                               0,
                               &aQState->audioQueue );
//result is 0 OK so far	
	
for (int i =0; i < numAudioBuffers; i++) {
		
  result = AudioQueueAllocateBuffer( aQState->audioQueue, 
                               aQState->bufferSize, 
                               &aQState->audioBuffers[i] );			
  // again result 0 OK
		
  AudioQueueBufferRef thisBuf = aQState->audioBuffers[1];
		
  /* problem is here thisBuf->mAudioData is 0 so no data space 
      has been allocated*/
 }