iOS - Failed to play audio file

Question

I'm trying to play an mp3 audio file on iPhone executing the following code:

    NSURL *audioURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@/%@.mp3", FONYK_FILES_URL, [self.voicenote valueForKeyPath:@"Fonyker.fonykid"], [self.voicenote valueForKeyPath:@"Voicenote.vnid"]]];
    NSData *audioData = [NSData dataWithContentsOfURL:audioURL];
    NSString *filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                               NSUserDomainMask, YES) objectAtIndex:0] 
                          stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp3", [self.voicenote valueForKeyPath:@"Voicenote.vnid"]]];
    [audioData writeToFile:filePath atomically:YES];
    NSError *error = nil;
    AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:filePath] error:&error];
    [audioPlayer play];

When it reaches the AVAudioPlayer instantiation it outputs this in the debugger:

2012-03-15 17:08:51.531 Fonyk[13004:10703] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn:  dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable
  Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security
  Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
 in /System/Library/Frameworks/Security.framework/Versions/A/Security
2012-03-15 17:08:51.544 Fonyk[13004:10703] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn:  dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable
  Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security
  Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
 in /System/Library/Frameworks/Security.framework/Versions/A/Security

Can't find anything related, any idea what's happening?

Answer 1

Try creating AVURLAsset and asynchronously loading it's tracks as described in the AV Foundation Programming Guide. In the completion block you can create an AVPlayerItem and pass that to the player.

According to AV Foundation Release Notes for iOS 5, starting in iOS 5 the player should load the tracks if they are not already loaded. In my experience, however, this doesn't work. Manually loading them works so that's what I do.