is it possible to read metadata using HTTP live streaming in the iPhone SDK

Question

When playing a live stream using the HTTP Live Streaming method, is it possible read the current metadata (eg. Title and Artist)? This is for an iPhone radio app.

Answer 1

Swift solution. This is a sample of simple streaming audio player. You can read metadata in the method of delegate AVPlayerItemMetadataOutputPushDelegate.

import UIKit
import AVFoundation

class PlayerViewController: UIViewController {
    var player = AVPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()
        configurePlayer()
        player.play()
    }

    private func configurePlayer() {
        guard let url = URL(string: "Your stream URL") else { return }
        let asset = AVAsset(url: url)
        let playerItem = AVPlayerItem(asset: asset)
        let metadataOutput = AVPlayerItemMetadataOutput(identifiers: nil)
        metadataOutput.setDelegate(self, queue: DispatchQueue.main)
        playerItem.add(metadataOutput)
        player = AVPlayer(playerItem: playerItem)
    }
}

extension PlayerViewController: AVPlayerItemMetadataOutputPushDelegate {
    func metadataOutput(_ output: AVPlayerItemMetadataOutput, didOutputTimedMetadataGroups groups: [AVTimedMetadataGroup], from track: AVPlayerItemTrack?) {
        let item = groups.first?.items.first
        item?.value(forKeyPath: "value")
        print(item!.value(forKeyPath: "value")!)
    }
}

Answer 2

in swift 2.0 getting metadata info music streaming:

PlayerItem.addObserver(self, forKeyPath: "timedMetadata", options: NSKeyValueObservingOptions.New, context: nil)

add this method:

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

    //Atualiza Nome Musica
    if keyPath == "timedMetadata" {
        if let meta = PlayerItem.timedMetadata {
            print("Novo Metadata \(meta)")
            for metadata in meta {
                if let nomemusica = metadata.valueForKey("value") as? String{
                    LB_NomeMusica.text = nomemusica
                    if NSClassFromString("MPNowPlayingInfoCenter") != nil {
                        let image:UIImage = UIImage(named: "logo.gif")!
                        let albumArt = MPMediaItemArtwork(image: image)
                        var songInfo: [String:AnyObject] = [
                            MPMediaItemPropertyTitle: nomemusica,
                            MPMediaItemPropertyArtist: "Ao Vivo",
                            MPMediaItemPropertyArtwork: albumArt
                        ]
                        MPNowPlayingInfoCenter.defaultCenter().nowPlayingInfo = songInfo
                    }
                }
            }
        }
    }


}