I am trying to detect when the user is blowing into the mic of an iPhone. Right now I am using the SCListener class from Stephen Celis to call
if ([[SCListener sharedListener] peakPower] > 0.99)
in an NSTimer. However, this returns true sometimes when I'm not blowing. Anyone have any sample code to check if the user is blowing into the mic?
Use return as lowPassResults is bigger than 0.55. This is working fine:
-(void)readyToBlow1 { 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:&error];
if (recorder) {
[recorder prepareToRecord];
recorder.meteringEnabled = YES;
[recorder record];
levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.01 target: self selector: @selector(levelTimerCallback1:) userInfo: nil repeats: YES];
} else
NSLog(@"%@",[error description]);
}
-(void)levelTimerCallback1:(NSTimer *)timer { [recorder updateMeters];
const double ALPHA = 0.05;
double peakPowerForChannel = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
double lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;
if (lowPassResults > 0.55) {
lowPassResults = 0.0;
[self invalidateTimers];
NextPhase *objNextView =[[NextPhase alloc]init];
[UIView transitionFromView:self.view
toView:objNextView.view
duration:2.0
options:UIViewAnimationOptionTransitionCurlUp
completion:^(BOOL finished) {}
];
[self.navigationController pushViewController:objNextView animated:NO];
**return;**
}
}
http://mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/
this tutorial works fine with simulator but its not working in iphone there is no response from iphone mic