NSData dataWithContentsOfFile 100% leak in instruments

Question

UPDATED

Why NSData dataWithContentsOfFile line is showing leak in Instruments? I am using ARC. Deployment Target is iOS 5.0

@autoreleasepool
{
    AudioPlayerAV *context = [userInfo valueForKey:@"self"];
    NSString *filepath = [userInfo valueForKey:@"filepath"];
    [context.player stop];

    //check if file is there fetch player from dict
    AVAudioPlayer *_player = nil;
    NSError *error = nil;
    NSData *filedata = [NSData dataWithContentsOfFile:filepath];

    _player = [[AVAudioPlayer alloc]initWithData:filedata error:&error]; 
    context.player = _player;
    NSLog(@"loadAndPlay error : %@",[error description]);
    context.player.numberOfLoops = (context.loop)?-1:0;
    context.player.volume = context.volume;
    [context.player play];
}

100% allocation or 100% leak? Doesn't it mean that increase in allocations at this point is 100% caused by this object? — Atif Azad, Dec 29 '12 at 18:45
and `dataWithContentsOfFile` returns an `autoreleased` object. It shouldn't be a leak — Atif Azad, Dec 29 '12 at 18:47
@Atif of course it doesn't but that is creating a leak but live bytes are increasing with each leak. — Saurabh Passolia, Dec 29 '12 at 18:47
If this code is in a cycle, I suggest you put the body of the cycle into an autorelease block. That way it should not increase. — Levi, Dec 29 '12 at 18:52
thanks @Levi, but this line is already in autoreleasepool block.. — Saurabh Passolia, Dec 29 '12 at 18:53

score 2 · Answer 1 · edited Jun 20 '20 at 09:12

Sometimes, instruments points to the wrong line, I think it is this leak in AVAudioPlayer.

from: Leak from NSURL and AVAudioPlayer using ARC

Looks to be a leak in Apple's code... I tried using both

-[AVAudioPlayer initWithData:error:] and -[AVAudioPlayer initWithContentsOfURL:error:]

In the first case, the allocated AVAudioPlayer instance retains the passed in NSData. In the second, the passed in NSURL is retained.

You can see the AVAudioPlayer object then creates a C++ object AVAudioPlayerCpp, which retains the NSData again

Later, when the AVAudioPlayer object is released, the NSData is released, but there's never a release call from the associated AVAudioPlayerCpp... (You can tell from the attached image)

Check it out, there are some instruments screenshots attached in the answer.

NSData dataWithContentsOfFile 100% leak in instruments

1 Answers1