Microphone code doesn't run on iPhone device

[saqibjaan]

I am trying to run the following code on my device with no success. Although the code works perfectly on Simulator. I have been following this tutorial. It simply crash on device.

Tutorial: Detecting When A User Blows Into The Mic | Mobile Orchard

Code is:

@interface MicBlowViewController : UIViewController
{
AVAudioRecorder *recorder;
NSTimer *levelTimer;
double lowPassResults;
}

- (void)levelTimerCallbackNSTimer *)timer;

@end



- (void)viewDidLoad
{
[super viewDidLoad];

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: 3
target: self
selector: @selector(levelTimerCallback
userInfo: nil
repeats: YES];
}
else
NSLog(@"%@", [error description]);
}


- (void)levelTimerCallbackNSTimer *)timer
{
[recorder updateMeters];

const double ALPHA = 0.05;
double peakPowerForChannel = pow(10, (0.05 * [recorder peakPowerForChannel:0]));
lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * lowPassResults;

if (lowPassResults < 0.95)
NSLog(@"Mic blow detected");
}

[smithdale87]

The error message & stack trace from the crash would be helpful.. just FYI

[Duncan C]

Originally Posted by smithdale87

The error message & stack trace from the crash would be helpful.. just FYI

As well as the specific source line on which it crashes.

[saqibjaan]

I am using iPhone configuration utility to see NSLog statements. From there, I see the following lines. I am sharing the first 2 lines.


unknown com.apple.launchd[1] <Warning>: (UIKitApplication:com.yourcompany.MicBlow[0xe0ef]) Job appears to have crashed: Bus error

unknown SpringBoard[27] <Warning>: Application 'MicBlow' exited abnormally with signal 10: Bus error