在Swift 2 Xcode 7中从.pls接收元数据 [英] Receiving metadata from .pls in Swift 2 Xcode 7

问题描述

我正在编写一个无线电应用程序，并希望从.pls格式的网址和以下代码中获取元数据:

I'm writing an radio app and want to get metadata from url of .pls format and the following code:

var PlayerItem: AVPlayerItem!
var asset :  AVAsset? // init with url of .pls format

PlayerItem = AVPlayerItem(asset: asset!)
PlayerItem.addObserver(self, forKeyPath: "timedMetadata" [...]

PlayerItem.timedMetadata - is always nil or 0

我应该添加些什么来接收元数据?

What am I supposed to add, to receive metadatas?

推荐答案

快速Swift 2实现:

Quick Swift 2 implemetation:

var player: AVPlayer!
var playerItem: AVPlayerItem!

override func viewDidLoad() {
    super.viewDidLoad()
    ....
    playerItem = AVPlayerItem(URL: NSURL(string: <streamURL>)!)
    player = AVPlayer(playerItem: playerItem)

    // To be informed when metadata changes  
    playerItem.addObserver(self, forKeyPath: "timedMetadata", options: [], context: nil)
}

override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {  
    // Get medatata, making sure to support a wider range of characters
    let origMetaTitle = (playerItem.timedMetadata?.first?.stringValue?.dataUsingEncoding(NSISOLatin1StringEncoding, allowLossyConversion: true))!
    let convertedMetaTitle = String(data: origMeta, encoding: NSUTF8StringEncoding)!
    ....
    }

deinit {
    // Be a good citizen
    playerItem.removeObserver(self, forKeyPath: "timedMetadata")
}

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