Strange behavior with AVAudioPlayer on iPhone
I am trying to play audio using AVAudioPlayer. Should be simple, but I am seeing some odd results.
the code:
NSString *path = [[NSBundle mainBundle] pathForResource:@"pop" ofType:@"wav"];
NSURL *url = [NSURL fileURLWithPath:path];
AVAudioPlayer *sound = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[sound play];
[sound release];
I can see that no sound is playing during normal use of the app.
It only reproduces if I step through the code using the debugger, it doesn't reproduce when I do the other way ...
I am not creating any new threads or launches in my application, so this should all be done on the main thread, at least [NSThread isMainThread]
returns true.
Anyone have any ideas as to what is going on here?
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The AVAudioPlayer method play
is asynchronous, so you start playing the sound and then immediately release it! This is why it works when you go through it in the debugger - you give it time to play before you kill it. What you want to do is implement the AVAudioPlayerDelegate method - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
and free the audio player there after the audio has been played.
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papajohn is right, you should do it like this
You have an audio player level variable like
AVAudioPlayer *classLevelPlayer;
synthesize this object. and when calling the player method
-(void)playTheSong{
if(classLevelPlayer!=nil){
[classLevelPlayer stop];
[self setClassLevelPlayer:nil];
}
NSString *path = [[NSBundle mainBundle] pathForResource:@"pop" ofType:@"wav"];
NSURL *url = [NSURL fileURLWithPath:path];
AVAudioPlayer *sound = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
if(sound){
[self setClassLevelPlayer:sound];
[classLevelPlayer play];
}
[sound release];
}
and in
-(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
[self setClassLevelPlayer:nil];
}
Hope it helps.
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