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copied!<p>Try the AudioQueue Framework for this. You mainly have to perform 3 steps:</p> <ol> <li>setup an audio format how to sample the incoming analog audio</li> <li>start a new recording AudioQueue with AudioQueueNewInput()</li> <li>Register a callback routine which handles the incoming audio data packages</li> </ol> <p>In step 3 you have a chance to analyze the incoming audio data with AudioQueueGetProperty()</p> <p>It's roughly like this:</p> <pre><code>static void HandleAudioCallback (void *aqData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer, const AudioTimeStamp *inStartTime, UInt32 inNumPackets, const AudioStreamPacketDescription *inPacketDesc) { // Here you examine your audio data } static void StartRecording() { // now let's start the recording AudioQueueNewInput (&aqData.mDataFormat, // The sampling format how to record HandleAudioCallback, // Your callback routine &aqData, // e.g. AudioStreamBasicDescription NULL, kCFRunLoopCommonModes, 0, &aqData.mQueue); // Your fresh created AudioQueue AudioQueueStart(aqData.mQueue, NULL); } </code></pre> <p>I suggest the <a href="http://developer.apple.com/library/ios/#documentation/MusicAudio/Conceptual/AudioQueueProgrammingGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40005343">Apple AudioQueue Services Programming Guide</a> for detailled information about how to start and stop the AudioQueue and how to setup correctly all ther required objects.</p> <p>You may also have a closer look into Apple's demo prog SpeakHere. But this is IMHO a bit confusing to start with.</p>

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