AVPlayer Fairplay HLS won't stop audio playback when video is paused - ios

Question

I am using Fairplay implementation as per Apple's Fairplay Streaming sample code at https://developer.apple.com/streaming/fps/, although I tried to choose only parts that are related to Online Fairplay Streaming, not the persistence/offline playback. In the below code a video without Fairplay plays/pauses/seeks normally, but when I play a Fairplay protected video, only the video track behaves correctly.
Pausing playback won't stop the audio playback, changing audio track won't stop the previous audio track, so both plays together and perhaps the seek also does not work.
Besides this helper class below, I have AssetLoaderDelegate and AssetPlaybackManager from Apple's client sample code of FairPlay Streaming Server SDK https://developer.apple.com/streaming/fps/ and I have updated the code to handle SPC/CKC for our DRM keys provider.
Did I miss to implement some important part of the code to handle audio for FPS Streaming? Can you please point me into right direction? Many thanks.
class PlayHelper {
static let shared = PlayHelper()
fileprivate var playerViewController: PlayerViewController?
init() {
AssetPlaybackManager.sharedManager.delegate = self
}
// Play video without DRM
func playVideo(from urlString: String, at context: UIViewController) {
guard let videoURL = URL(string: urlString) else {
Log.error("Video URL can't be created from string: \(urlString)")
return }
let player = AVPlayer(url: videoURL)
let playerViewController = PlayerViewController()
playerViewController.player = player
context.present(playerViewController, animated: true) {
playerViewController.player?.play()
}
}
// Play FPS video
func playFpsVideo(with asset: AVURLAsset, at context: UIViewController) {
// Cleanup, should be done when playerViewController is actually dismissed
if self.playerViewController != nil {
// The view reappeared as a results of dismissing an AVPlayerViewController.
// Perform cleanup.
AssetPlaybackManager.sharedManager.setAssetForPlayback(nil)
self.playerViewController?.player = nil
self.playerViewController = nil
}
let item = AVPlayerItem(asset: asset)
let player = AVPlayer(playerItem: item)
// Customize player
player.appliesMediaSelectionCriteriaAutomatically = true
let playerViewController = PlayerViewController()
playerViewController.player = player
self.playerViewController = playerViewController
context.present(playerViewController, animated: true) {
playerViewController.player?.play()
}
}
// Stop video
func stop() {
// Cleanup, should be done when playerViewController is dismissed
if self.playerViewController != nil {
// Results of dismissing an AVPlayerViewController, perform cleanup
AssetPlaybackManager.sharedManager.setAssetForPlayback(nil)
self.playerViewController?.player = nil
self.playerViewController = nil
}
}
}
// MARK: - Extend `PlayHelper` to conform to the `AssetPlaybackDelegate` protocol
extension PlayHelper: AssetPlaybackDelegate {
func streamPlaybackManager(_ streamPlaybackManager: AssetPlaybackManager, playerReadyToPlay player: AVPlayer) {
player.play()
}
func streamPlaybackManager(_ streamPlaybackManager: AssetPlaybackManager, playerCurrentItemDidChange player: AVPlayer) {
guard let playerViewController = playerViewController, player.currentItem != nil else { return }
playerViewController.player = player
}
}
I can also provide the code in AssetLoaderDelegate and AssetPlaybackManager if needed.

Answer 1

My bad. I called play() twice in the code above... Grrr.. Once when the presentation of the PlayerViewController finished and second time in the callback from AssetPlaybackDelegate that is triggered by KVO in AssetPlaybackManager. This way the player controls stopped playing the video, but most probably a second (audio) stream was still playing there. I removed the play() in playerReadyToPlay callback and now all the controls in the Player works as expected. I can pause, resume, seek, change audio tracks.