Tukukkk

I am learning Swift as my first programming language.

I've struggled for many hours to resume background audio playback after interruption (eg call)

What should happen:

1. Audio keeps playing when app goes to background (works)


2. When interrupted by a call, get the notification for interruption began
   (works)


3. When call ends, get the notification for interruption
   ends (works)


4. Resume playing the audio (does NOT work - hear nothing)

Really appreciate any help! Thanks

Notes:

1. The app is registered for background audio and plays fine before interruption


2. I have tried with and without the time delay to resume playing - neither work

Code:

import UIKit

import AVFoundation



var player: AVQueuePlayer!



class ViewController: UIViewController {



    override func viewDidLoad() {

        super.viewDidLoad()

        do {

            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)

            try AVAudioSession.sharedInstance().setActive(true, withOptions: .NotifyOthersOnDeactivation)

        } catch { }

        let songNames = ["music"]

        let songs = songNames.map { AVPlayerItem(URL:

            NSBundle.mainBundle().URLForResource($0, withExtension: "mp3")!) }

        player = AVQueuePlayer(items: songs)



        let theSession = AVAudioSession.sharedInstance()

        NSNotificationCenter.defaultCenter().addObserver(self,

            selector:"playInterrupt:",

            name:AVAudioSessionInterruptionNotification,

            object: theSession)



        player.play()

    }



    func playInterrupt(notification: NSNotification) {



        if notification.name == AVAudioSessionInterruptionNotification

            && notification.userInfo != nil {



            var info = notification.userInfo!

            var intValue: UInt = 0

            (info[AVAudioSessionInterruptionTypeKey] as! NSValue).getValue(&intValue)

            if let type = AVAudioSessionInterruptionType(rawValue: intValue) {

                switch type {

                case .Began:

                    print("aaaaarrrrgggg you stole me")

                    player.pause()



                case .Ended:

                    let timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "resumeNow:", userInfo: nil, repeats: false)

                }

            }

        }

    }

    func resumeNow(timer : NSTimer) {

        player.play()

        print("attempted restart")

    }

}

Finally got it!

Solution: added the mixable option by changing the setCategory line to be:

AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback,

                                            withOptions: .mixWithOthers )

I wrote a code like this and successfully resumed the audio from the phone call ended. I was build on Xcode 6.4 and ran the app on my iPhone 4S.

var player: AVQueuePlayer! = nil



override func viewDidLoad()

{

    super.viewDidLoad()

    // Do any additional setup after loading the view, typically from a nib.

}



override func viewDidAppear(animated: Bool)

{

    super.viewDidAppear(true)



    var song = AVPlayerItem(URL: NSBundle.mainBundle().URLForResource("AlmostAYearAgo", withExtension: "mp3")!)

    player = AVQueuePlayer(items: [song])



    let theSession = AVAudioSession.sharedInstance()



    NSNotificationCenter.defaultCenter().addObserver(self, selector: "playInterrupt:", name: AVAudioSessionInterruptionNotification, object: theSession)



    player.play()

}



override func didReceiveMemoryWarning()

{

    super.didReceiveMemoryWarning()

    // Dispose of any resources that can be recreated.

}



func playInterrupt(notification: NSNotification)

{

    if notification.name == AVAudioSessionInterruptionNotification && notification.userInfo != nil

    {

        var info = notification.userInfo!

        var intValue: UInt = 0



        (info[AVAudioSessionInterruptionTypeKey] as! NSValue).getValue(&intValue)



        if let type = AVAudioSessionInterruptionType(rawValue: intValue)

        {

            switch type

            {

            case .Began:

                print("aaaaarrrrgggg you stole me")

                player.pause()

            case .Ended:

                let timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "resumeNow:", userInfo: nil, repeats: false)

            }

        }

    }

}



func resumeNow(timer : NSTimer)

{

    player.play()

    print("attempted restart")

}

For me reload player after end interruption resolve the problem:

    func interruptionNotification(_ notification: Notification) {

    guard let type = notification.userInfo?[AVAudioSessionInterruptionTypeKey] as? UInt,

      let interruption = AVAudioSessionInterruptionType(rawValue: type) else {

        return

    }

    if interruption == .ended && playerWasPlayingBeforeInterruption {

      player.replaceCurrentItem(with: AVPlayerItem(url: radioStation.url))

      play()

    }

  }

Simon, absolutely confirm it on my end. I spend 2 days looking for it! If you use just:

AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback) then does not matter what you do your player will not resume playing audio if you use instead:

AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, withOptions: AVAudioSessionCategoryOptions.MixWithOthers)

then it works like perfect and will resume after receiving phone call while the app is in the background.

Thanks!