AVAudioRecorder Memory Leak
- by Eric Ranschau
I'm hoping someone out there can back me up on this...
I've been working on an application that allows the end user to record a small audio file for later playback and am in the process of testing for memory leaks. I continue to very consistently run into a memory leak when the AVAudioRecorder's "stop" method attempts to close the audio file to which it's been recording. This really seems to be a leak in the framework itself, but if I'm being a bonehead you can tell me.
To illustrate, I've worked up a stripped down test app that does nothing but start/stop a recording w/ the press of a button. For the sake of simplicty, everything happens in app. delegate as follows:
@synthesize audioRecorder, button;
@synthesize window;
- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// create compplete path to database
NSString *tempPath = NSTemporaryDirectory();
NSString *audioFilePath = [tempPath stringByAppendingString:@"/customStatement.caf"];
// define audio file url
NSURL *audioFileURL = [[NSURL alloc] initFileURLWithPath:audioFilePath];
// define audio recorder settings
NSDictionary *settings = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatAppleIMA4], AVFormatIDKey,
[NSNumber numberWithInt:1], AVNumberOfChannelsKey,
[NSNumber numberWithInt:AVAudioQualityLow], AVSampleRateConverterAudioQualityKey,
[NSNumber numberWithFloat:44100], AVSampleRateKey,
[NSNumber numberWithInt:8], AVLinearPCMBitDepthKey,
nil
];
// define audio recorder
audioRecorder = [[AVAudioRecorder alloc] initWithURL:audioFileURL settings:settings error:nil];
[audioRecorder setDelegate:self];
[audioRecorder setMeteringEnabled:YES];
[audioRecorder prepareToRecord];
// define record button
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:@selector(handleTouch_recordButton) forControlEvents:UIControlEventTouchUpInside];
[button setFrame:CGRectMake(110.0, 217.5, 100.0, 45.0)];
[button setTitle:@"Record" forState:UIControlStateNormal];
[button setTitle:@"Stop" forState:UIControlStateSelected];
// configure the main view controller
UIViewController *viewController = [[UIViewController alloc] init];
[viewController.view addSubview:button];
// add controllers to window
[window addSubview:viewController.view];
[window makeKeyAndVisible];
// release
[audioFileURL release];
[settings release];
[viewController release];
return YES;
}
- (void) handleTouch_recordButton {
if ( ![button isSelected] ) {
[button setSelected:YES];
[audioRecorder record];
} else {
[button setSelected:NO];
[audioRecorder stop];
}
}
- (void) dealloc {
[audioRecorder release];
[button release];
[window release];
[super dealloc];
}
The stack trace from Instruments that shows pretty clearly that the "closeFile" method in the AVFoundation code is leaking...something. You can see a screen shot of the Instruments session here: Developer Forums: AVAudioRecorder Memory Leak
Any thoughts would be greatly appreciated!
