从MP3 HTTP流中获取元数据

Question

我想从MP3 HTTP流中获取元数据。使用AVPlayer播放流。

我已尝试使用AVPlayerItemMetadataCollector，但它返回nil。

另一种方法是在显示当前标题的流网站上获取特定部分。

这是我的播放器代码：

let playerItem = AVPlayerItem(url: URL(string: "stream.p4.no/p5trondheim_mp3_hq")!)
player = AVPlayer(playerItem: playerItem)
player.rate = 1.0;
player.play()

我该怎么办？

Answer 1

您可以在AVPlayerItem上观察timedMetadata：

{
  ...
  // Add observer
  playerItem.addObserver(self, forKeyPath: "timedMetadata", options: .new, context: nil)
  ...
}

// Observe
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
  guard keyPath == "timedMetadata" else { return }
  guard let meta = playerItem.timedMetadata else { return }
  for metadata in meta {
    if let songName = metadata.value(forKey: "value") as? String {
      print("song name is '\(songName)'")
    }
  }
}