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POiPhone Mic Level : Code works in one project, not in another
 

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  1. POiPhone Mic Level : Code works in one project, not in another
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    <p>This <a href="http://www.mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/" rel="nofollow">tutorial</a> code works fine for me. I set it up to spit out the value of lowPAssResult. Run it on the phone, sure enough, as expected...</p> <p>2011-07-04 14:28:08.672 MicBlow[280:707] Mic blow detected : 0.036449 ...etc, The value goes up if I blow into it. All good.</p> <p>But when I take it and put it in my own project framework, it doesn't work. I put this code in my init function...</p> <pre><code>//Set up the mic stuff NSURL *url = [NSURL fileURLWithPath:@"/dev/null"]; NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithFloat: 44100.0], AVSampleRateKey, [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey, [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, [NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey, nil]; NSError *error; recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&amp;error]; if (recorder) { [recorder prepareToRecord]; [recorder record]; recorder.meteringEnabled = YES; levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES]; } </code></pre> <p>And added this callback</p> <pre><code>- (void)levelTimerCallback:(NSTimer *)timer { [recorder updateMeters]; const double ALPHA = 0.05; double peakPowerForChannel = pow(10, (0.05 * [recorder peakPowerForChannel:0])); lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults; NSLog(@"Mic blow detected - peakPowerForChannel : %f, lowPassResults: %f",peakPowerForChannel,lowPassResults); } </code></pre> <p>And the output looks like this;</p> <p>2011-07-04 14:30:32.974 MinuteGames[290:707] Mic blow detected : 0.000001 repeatedly. Every frame</p> <p>No matter how much blowing I do. Please help, I'm sure this must be somethgn simple!</p>
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