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copied!<p>Create audioSession object,its upto you whether you want to activate or deactivate your app’s audio session.(<a href="https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVAudioSession_ClassReference/Reference/Reference.html" rel="nofollow">AVAudioSession</a>)</p> <pre><code>audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err]; if(err) { NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]); return; } [audioSession setActive:YES error:&err]; </code></pre> <p>Start recording proces,</p> <pre><code>-startRecording { [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey]; // We can use 44100, 32000, 24000, 16000 or 12000 depending on sound quality [recordSetting setValue:[NSNumber numberWithFloat:32000.0] forKey:AVSampleRateKey]; // We can use 2(if using additional h/w) or 1 (iPhone only has one microphone) [recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey]; mediaPath = [[NSString stringWithFormat:@"%@/myVoice.mp3", DOCUMENTS_FOLDER] retain];//where you want to save your recorded audio. NSURL *url = [NSURL fileURLWithPath:mediaPath]; err = nil; NSData *audioData = [NSData dataWithContentsOfFile:[url path] options: 0 error:&err]; recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err]; [recorder setDelegate:self]; [recorder prepareToRecord]; recorder.meteringEnabled = YES; BOOL audioHWAvailable = audioSession.inputAvailable; if (! audioHWAvailable) { UIAlertView *cantRecordAlert = [[UIAlertView alloc] initWithTitle: @"Warning" message: @"Audio input hardware not available" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [cantRecordAlert show]; [cantRecordAlert release]; return; } [recorder record]; } </code></pre> <p>Pause recording:</p> <pre><code>-pauseRecording { [recorder pause]; //[recorder updateMeters]; } </code></pre> <p>Again resume the process..audiosession will do it for you...</p> <pre><code>-resumerecording { [recorder record]; //[recorder updateMeters]; } </code></pre> <p><strong>EDIT</strong>: [recorder <a href="https://developer.apple.com/library/mac/documentation/AVFoundation/Reference/AVAudioRecorder_ClassReference/Reference/Reference.html#//apple_ref/occ/instm/AVAudioRecorder/updateMeters" rel="nofollow">updateMeters]</a>; should be called periodically which refreshes the average and peak power values for all channels of an audio recorder.</p> <p>You can use timer for that.</p> <p>For example:</p> <pre><code> NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateAudioDisplay) userInfo:NULL repeats:YES]; -(void)updateAudioDisplay { if (!recorder.isRecording) { [recorder updateMeters]; } else { if (recorder == nil) { //recording is not yet started } else { //paused } } } </code></pre> <p>You can download the sample code from <a href="https://app.box.com/s/ee2d09307146c9016f56" rel="nofollow">here</a>.</p>

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