Save audio data into a file from AVCaptureAudioDataOutput

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C

Mobile

iPhone

Objective-C

I'm newbie in iPhone programming and i need some help. I'm writing an application which should record audio and video data simultaneously but to different targets because i need to process audio data separately.

So i tried several ways of implementing this and decided to do it with AVFoundation.

The problem is i really don't know how to save output audio data to a file by my own.. What format and other properties should i use for it..

I set up audio input for AVCaptureSession and receive audio data in the following way:

- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
       fromConnection:(AVCaptureConnection *)connection
{
    AudioBufferList audioBufferList;
    CMBlockBufferRef blockBuffer;

    // Here i get AudioBufferList to save audio data
    CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(
                                                            sampleBuffer, 
                                                            NULL, 
                                                            &audioBufferList, 
                                                            sizeof(audioBufferList), 
                                                            NULL, 
                                                            NULL, 
                                                            0, 
                                                            &blockBuffer);

    // Here should be saving logic
}

Could you please to give me a hint of how it can be implemented and in what way should i look?

Thanx in advance, Jan.