OSStatus error 2003334207 when using AVAudioPlayer

Question

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.

Solution 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?

Solution 2

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)")
    }

Solution 3

try this one

var player: AVAudioPlayer = AVAudioPlayer()


@IBAction func playX(_ sender: Any) {
    let urlstring = "https://file-examples-com.github.io/uploads/2017/11/file_example_MP3_700KB.mp3"
    let url = URL(string: urlstring)
    let data = try! Data(contentsOf: url!)
    player = try! AVAudioPlayer(data: data)
    player.prepareToPlay()
    player.volume = 1.0
    player.play()
}

Solution 4

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.

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Comments

[user2747220]

You're absolutely correct. This is just makeshift code and not final. I've added an else statement and it doesn't crash the app anymore but it still throws the same error.

[user2747220]

Thanks, you are right. The app still throws the same error. the fetchedResultsController returns the right object of type CDEpisode.

[user2747220]

There was a mistake in my CoreData database. This is now fixed. Thanks to you and @dan