How to simply play a CMSampleBufferRef audio data?

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I'm capturing audio within an AVCaptureSession, now I'm about to play it.

I'm really not into lower level audio processing, so ObjectAL seems a fair choice for this, so I tried to get buffer pointer, some format information, then create an ObjectAL buffer.

 -(void)captureOutput:(AVCaptureOutput*) captureOutput
didOutputSampleBuffer:(CMSampleBufferRef) sampleBuffer
       fromConnection:(AVCaptureConnection*) connection
{
    if ([captureOutput isKindOfClass:[AVCaptureAudioDataOutput class]])
    {

        // Get samples.
        CMBlockBufferRef audioBuffer = CMSampleBufferGetDataBuffer(sampleBuffer);
        size_t lengthAtOffset;
        size_t totalLength;
        char *samples;
        CMBlockBufferGetDataPointer(audioBuffer, 0, &lengthAtOffset, &totalLength, &samples);

        // Get format.
        CMAudioFormatDescriptionRef format = CMSampleBufferGetFormatDescription(sampleBuffer);
        const AudioStreamBasicDescription *description = CMAudioFormatDescriptionGetStreamBasicDescription(format);

        ALBuffer *openALbuffer = [ALBuffer bufferWithName:@"buffer just captured before"
                                                     data:sampleBuffer
                                                     size:totalLength
                                                   format:description->mFormatID
                                                frequency:description->mSampleRate];
    }
}

It says Invalid Value:

OAL Error: +[ALWrapper bufferDataStatic:format:data:size:frequency:]: Invalid Value (error code 0x0000a003)

Is there any format / buffer conversation I have to utilize before create such ObjectAL (OpenAL) buffer?

asked 2 mins ago

Geri

2,911