ios - AVPlayer 的定时元数据

Question

你能控制AVURLAsset加载它需要的数据的方式吗？我需要添加自定义 HTTP header (ICY-MetaData=1)，但似乎不知道如何操作。

Answer 1

显然，AVPlayer 会自动从 Icecast 请求元数据。下面的代码完美运行。

class ViewController: UIViewController {
    var Player: AVPlayer!
    var PlayerItem: AVPlayerItem!

    override func viewDidLoad() {
        super.viewDidLoad()

        PlayerItem = AVPlayerItem(URL: NSURL(string: "http://live.machine.fm/aac"))
        PlayerItem.addObserver(self, forKeyPath: "timedMetadata", options: nil, context: nil)
        Player = AVPlayer(playerItem: PlayerItem)
        Player.play()
    }

    override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject, change: [NSObject : AnyObject], context: UnsafeMutablePointer<Void>) -> Void {

        if keyPath != "timedMetadata" { return }

        var data: AVPlayerItem = object as AVPlayerItem

        for item in data.timedMetadata as [AVMetadataItem] {
            println(item.value)
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}