AVAudioEngine and AVAudioPlayerNode: Play/Pause not updating in iOS command center properly

Question

I have read Play/Pause and Elapsed Time not updating in iOS command center properly

I have tried MPNowPlayingInfoPropertyElapsedPlaybackTime, MPNowPlayingInfoPropertyDefaultPlaybackRate and MPNowPlayingInfoPropertyPlaybackRate .

I have updated the apple demo

The apple demo is OK to show Play/Pause updating in iOS command center, with AVPlayer

Here is using AVAudioEngine and AVAudioPlayerNode, AVAudioPlayerNode plays audio by scheduleBuffer.

Here is the relevant iOS command center code:

func show(mediaInfo time: TimeInterval){
        let artistName = "test"
        
        guard let duration = length else {
            return
        }
        var isPlaying: Double = 0
        
        var pInfo: [String: Any] = [MPMediaItemPropertyArtist : artistName,
                                    MPMediaItemPropertyTitle : artistName ]
        if let img = UIImage(systemName: "music.note.list"){
            let artwork = MPMediaItemArtwork(boundsSize: img.size, requestHandler: {  (_) -> UIImage in
                return img
            })
            pInfo[MPMediaItemPropertyArtwork] = artwork
            
        }
        
        if streamer.state == .playing{
            isPlaying = 1
            pInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = time
            pInfo[MPMediaItemPropertyPlaybackDuration] = duration
        }
        pInfo[MPMediaItemPropertyPersistentID] = artistName
        pInfo[MPNowPlayingInfoPropertyPlaybackRate] = NSNumber(floatLiteral: isPlaying)
        pInfo[MPNowPlayingInfoPropertyDefaultPlaybackRate] = NSNumber(floatLiteral: isPlaying)
        pInfo[MPNowPlayingInfoPropertyMediaType] = NSNumber(value: MPNowPlayingInfoMediaType.audio.rawValue)
        MPNowPlayingInfoCenter.default().nowPlayingInfo = pInfo
    }

here is the example code

The corresponding audio session:

func setupAudioSession() {
        let session = AVAudioSession.sharedInstance()
        do {
            try session.setCategory(.playback, mode: .default, policy: .default, options: [.allowBluetoothA2DP,.defaultToSpeaker])
            try session.setActive(true)
        } catch {
            os_log("Failed to activate audio session: %@", log: ViewController.logger, type: .default, #function, #line, error.localizedDescription)
        }
    }

also tried

let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setCategory(AVAudioSession.Category.playAndRecord, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
            audioSession.requestRecordPermission({ (isGranted: Bool) in
                
            })
        } catch  {}

To show your metadata in the command center you need to have an active non-mixable audio session category and to also be currently producing audio. Can you show your audio session configuration? — Rhythmic Fistman, Jan 09 '21 at 08:25
updated. You can try the github code ,if convenient https://github.com/BoxDengJZ/AudioJz/tree/master/UnderTheHood — dengApro, Jan 10 '21 at 13:40

score 2 · Accepted Answer · answered Sep 16 '21 at 09:38

2

You can try stop AVAudioEngine. like this:

engine.stop()

answered Sep 16 '21 at 09:38

TW520

86
6

score 1 · Answer 2 · answered Sep 17 '21 at 04:23

better to use engine.pause()

   public func pause(){

        // Check if the player node is playing
        guard playerNode.isPlaying else {
            return
        }
        
        // Pause the player node and the engine
        playerNode.pause()
        
        // Update the state
        state = .paused
        engine.pause()
    }

AVAudioEngine and AVAudioPlayerNode: Play/Pause not updating in iOS command center properly

2 Answers2