How to play audio sample buffers from AVCaptureAudioDataOutput - ios4

Question

The main goal of the app Im trying to make is a peer-to-peer video streaming. (Sort of like FaceTime using bluetooth/WiFi).
Using AVFoundation, I was able to capture video/audio sample buffers. Then Im sending the video/audo sample buffer data. Now the problem is to process the sample buffer data in the receiving side.
As for the video sample buffer, I was able to get a UIImage from the sample buffer. But for the audio sample buffer, I dont know how to process it so I can play the audio.
So the question is how can I process/play the audio sample buffers?
Right now Im just plotting the waveform, just like in apple's Wavy sample code:
CMSampleBufferRef sampleBuffer;
CMItemCount numSamples = CMSampleBufferGetNumSamples(sampleBuffer);
NSUInteger channelIndex = 0;
CMBlockBufferRef audioBlockBuffer = CMSampleBufferGetDataBuffer(sampleBuffer);
size_t audioBlockBufferOffset = (channelIndex * numSamples * sizeof(SInt16));
size_t lengthAtOffset = 0;
size_t totalLength = 0;
SInt16 *samples = NULL;
CMBlockBufferGetDataPointer(audioBlockBuffer, audioBlockBufferOffset, &lengthAtOffset, &totalLength, (char **)(&samples));
int numSamplesToRead = 1;
for (int i = 0; i < numSamplesToRead; i++) {
SInt16 subSet[numSamples / numSamplesToRead];
for (int j = 0; j < numSamples / numSamplesToRead; j++)
subSet[j] = samples[(i * (numSamples / numSamplesToRead)) + j];
SInt16 audioSample = [Util maxValueInArray:subSet ofSize:(numSamples / numSamplesToRead)];
double scaledSample = (double) ((audioSample / SINT16_MAX));
// plot waveform using scaledSample
[updateUI:scaledSample];
}

Answer 1

To show video you can use
(here is : getting of ARGB picture and converting to Qt (nokia qt) QImage you can replace by other image)
place it to delegate class
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer,0);
SVideoSample sample;
sample.pImage = (char *)CVPixelBufferGetBaseAddress(imageBuffer);
sample.bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
sample.width = CVPixelBufferGetWidth(imageBuffer);
sample.height = CVPixelBufferGetHeight(imageBuffer);
QImage img((unsigned char *)sample.pImage, sample.width, sample.height, sample.bytesPerRow, QImage::Format_ARGB32);
self->m_receiver->eventReceived(img);
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
[pool drain];