AVQueuePlayer - using slider to control all audio tracks at once

Question

I have multiple audio files that I want to play continuously and be able to control it with UISlider. I was using AVAudioPlayer but there was problem with gaps between each tracks. So I found AVQueuePlayer and now there are no gaps. But now I have problem with set AVQueuePlayer to right asset and time to play when UISlider value changed.

I have different duration of each tracks and I want to slider have same slice for each track so I get maximum duration of biggest track and then get acceleration for each track. Here is how I update slider when AVQueuePlayer is playing:

func updateSliderProgress() {
        var value: Float = 0
        if let track = tracks[self.playingIndex] {
            value = Float(self.playingIndex) * self.maximumDuration + Float(CMTimeGetSeconds(audioQueuePlayer.currentTime())) * track.acceleration
        }
        playerSlider.setValue(value, animated: false)
    }

And here is notification when AVPlayerItem did end:

func playerItemDidReachEnd(sender: AnyObject) {
        self.playingIndex++
...
}

It's working and UISlider is correctly progressing. But I have problem with other way:

@IBAction func playerSliderValueChanged(sender: AnyObject) {
    let seconds = Double(self.getSeekTime(self.playerSlider.value))
    audioQueuePlayer.seekToTime(CMTimeMakeWithSeconds(seconds, 1000))
}

Function seekToTime is inherit from AVPlayer and it sets time just for current track, right? So is it possible to change current AVPlayerItem (by index or something like that) and then apply time in that item? I found just method advanceToNextItem but I was hoping in more functions with changing current item.

So for now only solution which comes to my mind is that each time user uses slider I create new AVQueuePlayer use advanceToNextItem to set right track and then use seekToTime to get to correct time. Is there better solution?

AVQueuePlayer - using slider to control all audio tracks at once

0 Answers0