Apple

void audioFileStream_Packets (void *inClientData,
                             UInt32 inNumberBytes,
                             UInt32 inNumberPackets,
                             const void *inInputData,
                             AudioStreamPacketDescription *inPacketDescs) {

   customData.mNumPackets = inNumberPackets;
   customData.mPacketDescs = inPacketDescs;

   AudioQueueBufferRef outBuffer;
   AudioQueueAllocateBuffer(customData.mQueue, inNumberBytes, &outBuffer);
   AudioOutputCallBack(&customData, customData.mQueue, outBuffer);

}

You don't write the needed const void *inInputData to your buffer.

I don't know how to write data to an AudioQueue that's in memory

(only AudioFileReadPackets which does this for a file), however i found

a method that works for me.

Save the audiodata continuously to a temporary file and use the AudioQueue

sample project apple provides to read from that file (while the other process

is appending data to its end).

This works pretty nice