OSStatus error 2003334207 when using AVAudioPlayer

问题

I am trying to play an MP3 file (works when played via VLC/iTunes) when a button is pressed. Here is my code:

     var audioPlayer: AVAudioPlayer!
     @IBAction func playEpisode(sender: AnyObject) {
    println("now playing")
    let indexPath = NSIndexPath(forRow: sender.tag, inSection: 0)
    let data: CDEpisode = fetchedResultsController.objectAtIndexPath(indexPath!) as! CDEpisode
    var err: NSError?
    let url = NSURL(string: data.localPath)
    println("The url is \(url)")

    audioPlayer = AVAudioPlayer(contentsOfURL: url, error: &err)
    if audioPlayer == nil {
        if let e = err {
            println(e.localizedDescription)
        }
    }
    audioPlayer.delegate = self
    audioPlayer.prepareToPlay()
    audioPlayer.play()
}

Here is the log:

now playing
The url is Optional(file:///var/mobile/Containers/Data/Application/4747A71E-A63F-4EFC-B2DF-8B361361080B/Documents/serial-s01-e12.mp3)
The operation couldn’t be completed. (OSStatus error 2003334207.)
fatal error: unexpectedly found nil while unwrapping an Optional value

The EXC_BREAKPOINT happens on the audioPlayer.delegate = self.

Other threads on StackoOverflow do not help. Any ideas? Thanks

Edit: I have tried passing a localURL to contentsOfURL (instead of a CDEpisode object) and it still fails.

回答1:

It looks like your trying to unwrap a variable that has a nil value. You should safely unwrap your variables to prevent this.

if let data: CDEpisode = fetchedResultsController.objectAtIndexPath(indexPath!) as! CDEpisode
{
    var err: NSError?
    let url = NSURL(string: data.localPath)
    println("The url is \(url)")

    //rest of code
}

You will still need to figure out why it is returning nil but this is a safer way to unwrap variables and prevent crashing as there would need to be more context to resolve that issue.

Some questions to look into:

Are you sure the fetchedResultsController is returning an object at all?
Are you sure it is of CDEpisode?

回答2:

You're checking if audioPlayer is nil but then you go on to use it as if it wasn't anyway. You probably want something like:

if audioPlayer == nil {
    if let e = err {
        println(e.localizedDescription)
    }
} else {
    audioPlayer.delegate = self
    audioPlayer.prepareToPlay()
    audioPlayer.play()
}

And do something to actually handle the error case rather than just printing the error.

回答3:

This is probably caused by trying to load a file that doesn't exist. If that helps someone adding the call to url.checkResourceIsReachable() will log more descriptive message.

Example code:

    do {
        let url = URL(fileURLWithPath: dbObject.path)
        let isReachable = try url.checkResourceIsReachable()
        // ... you can set breaking points after that line, and if you stopped at them it means file exist.
    } catch let e {
        print("couldnt load file \(e.localizedDescription)")
    }

回答4:

In my case I was having the same issue and I found out that I needed to set this before start recording

try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)

Hope it helps anyone

回答5:

I also got this problem, after checking up the audio file url, found that it is stored in Cache directory. so audio player probably couldn't find audio file according to your "url".

please ensure, the url path is under Document directory.

来源：https://stackoverflow.com/questions/29088594/osstatus-error-2003334207-when-using-avaudioplayer

标签

ios

swift

avaudioplayer