Apple

Also, Have you sen this old post?

http://lists.apple.com/archives/coreaudio-api/2013/Jun/msg00006.html

Chris Adamson suggested that I use this technique for my problem of converted in-memory AAC files into PCM. Unfortunately I have been busy with other things these past few days, so I probably won't be able to try it out until this Friday.

Richard

On Tue, Sep 30, 2014 at 10:50 PM, Richard <email@hidden> wrote:

Hi,

Have you tried the sample code from chapter 6 of the Core Audio book? I didn't
get far with it myself but that was because my AAC file was coming off the
network and I didn't want to save it to disk, which your code fragment looks like
it is reading from a disk file, which is the case that the Core Audio book addressed.

Richard

On Tue, Sep 30, 2014 at 4:50 AM, claudio santoro <email@hidden> wrote:
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.

Dodo

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	>Re: Convert an in-memory mp3 file to PCM (From: Richard <email@hidden>)

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