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Record sound in iPhone

/ Published in: Objective C
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  1. -(void) mic{
  2.  
  3. 	[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
  4. 	time=0;
  5.  
  6. 	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  7. 	NSString *documentsDirectory = [paths objectAtIndex:0];
  8. 	NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0];
  9. 	NSString *caldate = [now description];
  10. 	NSString *recorderFilePath = [[NSString stringWithFormat:@"%@/%@.caf", documentsDirectory, caldate] retain];
  11.  
  12. 	NSURL *url = [NSURL fileURLWithPath:recorderFilePath];
  13. 	NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
  14. 							  [NSNumber numberWithFloat: 44100.0],                 AVSampleRateKey,
  15. 							  [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey,
  16. 							  [NSNumber numberWithInt: 1],                         AVNumberOfChannelsKey,
  17. 							  [NSNumber numberWithInt: AVAudioQualityMax],         AVEncoderAudioQualityKey,
  18. 							  nil];
  19.  
  20. 	NSError *error;
  21.  
  22. 	recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];
  23.  
  24. 	if (recorder) {
  25. 		[recorder prepareToRecord];
  26. 		recorder.meteringEnabled = YES;
  27. 		[recorder record];
  28. 		levelTimer = [NSTimer scheduledTimerWithTimeInterval: 0.03 target: self selector: @selector(levelTimerCallback:) userInfo: nil repeats: YES];
  29. 	}
  30. }
  31.  
  32. - (void)levelTimerCallback:(NSTimer *)t {
  33. 	[recorder updateMeters];
  34. 	isTimerValid=YES;
  35. 	if([recorder averagePowerForChannel:0]>-25){
  36. 	//record in progress
  37.         }	
  38. }

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