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    <p>Can you playback the caf file ?</p> <p>If you only want to record a sound from microphone to an aac file, you can use Audio Queue Services (I can post some code)</p> <p>Edit : it's an implementation from Apple dev tutorial, there might be some errors since I modified it to fit your question</p> <pre><code>//AudioQ.mm @implementation AudioQ static const int nBuffer = 3; struct AQRecorderState{ AudioStreamBasicDescription mDataFormat; AudioQueueRef mQueue; AudioQueueBufferRef mBuffers[nBuffer]; AudioFileID mAudioFile; UInt32 bufferByteSize; SInt64 mCurrentPacket; bool mIsRunning; }; AQRecorderState aqData; CFURLRef url; static OSStatus BufferFilledHandler( void * inUserData, SInt64 inPosition, UInt32 requestCount, const void * buffer, UInt32 * actualCount ){ // callback when you write to the file // you can handle audio packet and send them for broadcasting return 0; } static void HandleInputBuffer( void *aqData, AudioQueueRef inAq, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc ) { AQRecorderState *pAqData = (AQRecorderState*) aqData; if (AudioFileWritePackets ( pAqData-&gt;mAudioFile, false, inBuffer-&gt;mAudioDataByteSize, inPacketDesc, pAqData-&gt;mCurrentPacket, &amp;inNumPackets, inBuffer-&gt;mAudioData ) == noErr) { pAqData-&gt;mCurrentPacket += inNumPackets; } else { NSLog(@"err writing packet"); } if (pAqData-&gt;mIsRunning == 0) return; AudioQueueEnqueueBuffer(pAqData-&gt;mQueue,inBuffer,0,NULL); } -(OSStatus) initializeAQ{ //--- set the output format ---// aqData.mDataFormat.mSampleRate = 22050; aqData.mDataFormat.mFormatID = kAudioFormatMPEG4AAC; aqData.mDataFormat.mFormatFlags = kMPEG4Object_AAC_Main; aqData.mDataFormat.mBytesPerPacket = 0; aqData.mDataFormat.mFramesPerPacket = 1024; aqData.mDataFormat.mBytesPerFrame = 0; aqData.mDataFormat.mChannelsPerFrame = 1; aqData.mDataFormat.mBitsPerChannel = 0; AudioFileTypeID fileType = kAudioFileAAC_ADTSType; aqData.bufferByteSize = 0x5000; // ?? AudioQueueNewInput(&amp;aqData.mDataFormat, HandleInputBuffer, &amp;aqData, CFRunLoopGetMain(), kCFRunLoopCommonModes, 0, &amp;aqData.mQueue); aqData.mCurrentPacket = 0; aqData.mIsRunning = true; //--- record in a file get the callback when writing ---// AQRecorderState *pAqData = &amp;aqData; AudioFileInitializeWithCallbacks((void*)&amp;pAqData, nil, BufferFilledHandler, nil, nil, fileType, &amp;aqData.mDataFormat, kAudioFileFlags_EraseFile, &amp;aqData.mAudioFile); //--- prepare set of audio queue buffers ---// for(int i = 0 ; i &lt; nBuffer ; i++){ AudioQueueAllocateBuffer(aqData.mQueue, aqData.bufferByteSize, &amp;aqData.mBuffers[i]); AudioQueueEnqueueBuffer(aqData.mQueue, aqData.mBuffers[i], 0, NULL); } return 0; } -(void) start{ AudioQueueStart(aqData.mQueue, NULL); } -(void) stop{ NSLog(@"stoping"); AudioQueueStop(aqData.mQueue, true); aqData.mIsRunning = false; AudioQueueDispose (aqData.mQueue,true); AudioFileClose (aqData.mAudioFile); } @end </code></pre> <p>AudioQ.h</p> <pre><code>static void HandleInputBuffer( void *aqData, AudioQueueRef inAq, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc ); static OSStatus BufferFilledHandler( void * inUserData, SInt64 inPosition, UInt32 requestCount, const void * buffer, UInt32 * actualCount ); -(OSStatus)initializeAQ; -(void)stop; -(void)start; </code></pre>
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    1. POI converted CAF to AAC format using TPAACAudioConverter but converted file duration is 0
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    1. COThey were made for recording purpose with a large choice of output formats
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    2. COedited my first post with sample, notice it's objectiveC++
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    3. COyou can almost copy paste the code, don't forget to change .m to .mm and import "CoreAudio/CoreAudioTypes.h""AudioToolbox/AudioQueue.h" "AudioToolbox/AudioFile.h" "AudioToolbox/AudioConverter.h" I'm new to SO and dunno how to attach ...
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