Apple

Hi all,

I have a c++ mediaplayer that playes mp3 files and in its callback function I'd like to get the pcm flow of the buffer that is being playing.

This is my playback callback:

static void HandleOutputBuffer (
    void                *aqData,
    AudioQueueRef       inAQ,
    AudioQueueBufferRef inBuffer
)
{
    OSStatus status;

    AQPlayerState *pAqData = (AQPlayerState *) aqData;
    if (pAqData->mIsRunning == 0) return;
    UInt32 numBytesReadFromFile;
    UInt32 numPackets = pAqData->mNumPacketsToRead;
    status = AudioFileReadPackets (
                 pAqData->mAudioFile,
                 false,
                 &numBytesReadFromFile,
                 pAqData->mPacketDescs,
                 pAqData->mCurrentPacket,
                 &numPackets,
                 inBuffer->mAudioData
             );
//    checkStatus(status);
    if (numPackets > 0) {
        inBuffer->mAudioDataByteSize = numBytesReadFromFile;
        status = AudioQueueEnqueueBuffer (
                     pAqData->mQueue,
                     inBuffer,
                     (pAqData->mPacketDescs ? numPackets : 0),
                     pAqData->mPacketDescs
                 );
//        checkStatus(status);
        pAqData->mCurrentPacket += numPackets;

// Here: how to retreve the PCM from the buffer???

}

Can you tell me how to get the PCM of the buffer? I'd need it because I need to make a merge/mix with the line in microphone.

Thanx in advance.

References:
	>Convert an in-memory mp3 file to PCM (From: claudio santoro <email@hidden>)