make audio ducking and interruption more robust

Signed-off-by: Toni Förster <toni.foerster@gmail.com>

fix audio ducking and bluetooth play/pause

Signed-off-by: Toni Förster <toni.foerster@gmail.com>

Model/Player/Backends/AVPlayerBackend.swift

@@ -364,7 +364,11 @@ final class AVPlayerBackend: PlayerBackend {
 
         let startPlaying = {
             #if !os(macOS)
-                try? AVAudioSession.sharedInstance().setActive(true)
+                do {
+                    try AVAudioSession.sharedInstance().setActive(true)
+                } catch {
+                    self.logger.error("Error setting up audio session: \(error)")
+                }
             #endif
 
             self.setRate(self.model.currentRate)

Model/Player/Backends/MPVBackend.swift

@@ -248,13 +248,6 @@ final class MPVBackend: PlayerBackend {
             #if !os(macOS)
                 do {
                     try AVAudioSession.sharedInstance().setActive(true)
-
-                    NotificationCenter.default.addObserver(
-                        self,
-                        selector: #selector(self.handleAudioSessionInterruption(_:)),
-                        name: AVAudioSession.interruptionNotification,
-                        object: nil
-                    )
                 } catch {
                     self.logger.error("Error setting up audio session: \(error)")
                 }
@@ -649,33 +642,4 @@ final class MPVBackend: PlayerBackend {
             logger.info("MPV backend received unhandled property: \(name)")
         }
     }
-
-    #if !os(macOS)
-        @objc func handleAudioSessionInterruption(_ notification: Notification) {
-            logger.info("Audio session interruption received.")
-
-            guard let info = notification.userInfo,
-                  let typeValue = info[AVAudioSessionInterruptionTypeKey] as? UInt
-            else {
-                logger.info("AVAudioSessionInterruptionTypeKey is missing or not a UInt in userInfo.")
-                return
-            }
-
-            let type = AVAudioSession.InterruptionType(rawValue: typeValue)
-
-            logger.info("Interruption type received: \(String(describing: type))")
-
-            switch type {
-            case .began:
-                pause()
-                logger.info("Audio session interrupted.")
-            default:
-                break
-            }
-        }
-
-        deinit {
-            NotificationCenter.default.removeObserver(self, name: AVAudioSession.interruptionNotification, object: nil)
-        }
-    #endif
 }

Model/Player/PlayerModel.swift

@@ -47,7 +47,7 @@ final class PlayerModel: ObservableObject {
 
     static var shared = PlayerModel()
 
-    let logger = Logger(label: "stream.yattee.app")
+    let logger = Logger(label: "stream.yattee.player.model")
 
     var playerItem: AVPlayerItem?
 
@@ -204,6 +204,14 @@ final class PlayerModel: ObservableObject {
         #if !os(macOS)
             mpvBackend.controller = mpvController
             mpvBackend.client = mpvController.client
+
+            // Register for audio session interruption notifications
+            NotificationCenter.default.addObserver(
+                self,
+                selector: #selector(handleAudioSessionInterruption(_:)),
+                name: AVAudioSession.interruptionNotification,
+                object: nil
+            )
         #endif
 
         playbackMode = Defaults[.playbackMode]
@@ -220,6 +228,10 @@ final class PlayerModel: ObservableObject {
         currentRate = playerRate
     }
 
+    deinit {
+        NotificationCenter.default.removeObserver(self, name: AVAudioSession.interruptionNotification, object: nil)
+    }
+
     func show() {
         #if os(macOS)
             if presentingPlayer {
@@ -1231,6 +1243,42 @@ final class PlayerModel: ObservableObject {
         return nil
     }
 
+    #if !os(macOS)
+        @objc func handleAudioSessionInterruption(_ notification: Notification) {
+            logger.info("Audio session interruption received.")
+            logger.info("Notification received: \(notification)")
+
+            guard let info = notification.userInfo,
+                  let typeValue = info[AVAudioSessionInterruptionTypeKey] as? UInt,
+                  let type = AVAudioSession.InterruptionType(rawValue: typeValue)
+            else {
+                logger.info("AVAudioSessionInterruptionTypeKey is missing or not a UInt in userInfo.")
+                return
+            }
+
+            logger.info("Interruption type received: \(type)")
+
+            switch type {
+            case .began:
+                logger.info("Audio session interrupted.")
+                // We need to call pause() to set all variables correctly, and play()
+                // directly afterwards, because the .began interrupt is sent after audio
+                // ducking ended and playback would pause. Audio ducking usually happens
+                // when using headphones.
+                pause()
+                play()
+            case .ended:
+                logger.info("Audio session interruption ended.")
+                // We need to call pause() to set all variables correctly.
+                // Otherwise, playback does not resume when the interruption ends.
+                pause()
+                play()
+            default:
+                break
+            }
+        }
+    #endif
+
     #if os(macOS)
         private func assignKeyPressMonitor() {
             keyPressMonitor = NSEvent.addLocalMonitorForEvents(matching: .keyDown) { keyEvent -> NSEvent? in