ios avplayer trigger streaming is out of buffer

Question

I want to reconnect to the server when the streaming buffer is empty.

How can I trigger a method when the AVPlayer or AVPlayerItem buffer i

Answer 1

/* Swift 3.0, Add Observers */    
func setupPlayerObservers(){
    player.addObserver(self, forKeyPath: "currentItem.loadedTimeRanges", options: .new, context: nil)
    player.addObserver(self, forKeyPath: "rate", options: [.new], context: nil)
    player.currentItem?.addObserver(self, forKeyPath: "status", options: [.old, .new], context: nil)
    player.currentItem?.addObserver(self, forKeyPath: "playbackBufferEmpty", options: [.old, .new], context: nil)
    player.currentItem?.addObserver(self, forKeyPath: "playbackLikelyToKeepUp", options: [.old, .new], context: nil)

}    

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {

    //this is when the player is ready and rendering frames
    if keyPath == "currentItem.loadedTimeRanges" {

        if !hasLoaded {
            activityIndicatorView.stopAnimating()
            Mixpanel.mainInstance().track(event: "Play", properties: ["success": true, "type": "clip"])
        }
        hasLoaded = true
    }

    if keyPath == "rate" {
        if player.rate == 0.0 {
            playPauseButton.setImage(UIImage(named: "PlayButton"), for: UIControlState())
        } else {
            playPauseButton.setImage(UIImage(named: "PauseButton"), for: UIControlState())
        }

    }

    if keyPath == "status" {
        // Do something here if you get a failed || error status
    }

    if keyPath == "playbackBufferEmpty" {
        let time = Int(CMTimeGetSeconds(player.currentTime()))

        bufferingCount += 1
        if bufferingCount % 4 == 0 {
            Mixpanel.mainInstance().track(event: "VideoBuffered", properties: ["numTimes": bufferingCount, "type": "clip", "currentTime": time])
        }
        activityIndicatorView.isHidden = false
        activityIndicatorView.startAnimating()
    }


    if keyPath == "playbackLikelyToKeepUp" {
        activityIndicatorView.isHidden = true
        activityIndicatorView.stopAnimating()
    }
}
/* Remove observers in deinit */
deinit {
    player.removeTimeObserver(timeObserver)
    player.removeObserver(self, forKeyPath: "currentItem.loadedTimeRanges")
    player.removeObserver(self, forKeyPath: "rate")
    player.currentItem?.removeObserver(self, forKeyPath: "playbackBufferEmpty")
    player.currentItem?.removeObserver(self, forKeyPath: "playbackLikelyToKeepUp")
    player.currentItem?.removeObserver(self, forKeyPath: "status")
}