feat: add support for os media control

InfinifiIOS.xcodeproj/project.pbxproj

@@ -24,6 +24,7 @@
 		F12B73482C55C0C40064A230 /* .gitignore */ = {isa = PBXFileReference; lastKnownFileType = text; path = .gitignore; sourceTree = SOURCE_ROOT; };
 		F12B734A2C56AEB00064A230 /* LiveStatusManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LiveStatusManager.swift; sourceTree = "<group>"; };
 		F12B734C2C5702EC0064A230 /* LiveListenerCounter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LiveListenerCounter.swift; sourceTree = "<group>"; };
+		F12B734E2C57B0230064A230 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist; path = Info.plist; sourceTree = "<group>"; };
 		F138396C2C51BABD00B4814F /* InfinifiIOS.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = InfinifiIOS.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		F138396F2C51BABD00B4814F /* InfinifiIOSApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InfinifiIOSApp.swift; sourceTree = "<group>"; };
 		F13839712C51BABD00B4814F /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -61,6 +62,7 @@
 		F138396E2C51BABD00B4814F /* InfinifiIOS */ = {
 			isa = PBXGroup;
 			children = (
+				F12B734E2C57B0230064A230 /* Info.plist */,
 				F138396F2C51BABD00B4814F /* InfinifiIOSApp.swift */,
 				F13839712C51BABD00B4814F /* ContentView.swift */,
 				F13839732C51BABE00B4814F /* Assets.xcassets */,
@@ -295,6 +297,7 @@
 				DEVELOPMENT_TEAM = 5FG7YZ49ZA;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = InfinifiIOS/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = infinifi;
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
@@ -326,6 +329,7 @@
 				DEVELOPMENT_TEAM = 5FG7YZ49ZA;
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_FILE = InfinifiIOS/Info.plist;
 				INFOPLIST_KEY_CFBundleDisplayName = infinifi;
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;

InfinifiIOS/ContentView.swift

@@ -10,6 +10,12 @@ struct ContentView: View {
             playbackManager.stop()
         case .paused:
             playbackManager.nextTrack()
+            Task {
+                // sleep for 100ms before configuring audio session and control
+                // to prevent UI stutter
+                try await Task.sleep(nanoseconds: 100_000_000)
+                playbackManager.confiugureAudioSessionAndControls()
+            }
         default:
             break
         }

InfinifiIOS/Info.plist

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
+</dict>
+</plist>

InfinifiIOS/PlaybackManager.swift

@@ -1,5 +1,6 @@
 import AVKit
 import Foundation
+import MediaPlayer
 
 enum PlaybackState {
     case playing
@@ -21,6 +22,35 @@ class PlaybackManager: ObservableObject {
         Task { try await initialize() }
     }
 
+    func confiugureAudioSessionAndControls() {
+        let audioSession = AVAudioSession.sharedInstance()
+        do {
+            try audioSession.setCategory(.playback, mode: .default)
+            try audioSession.setActive(true)
+        } catch {}
+
+        NotificationCenter.default.addObserver(self, selector: #selector(onAudioInterrupted), name: AVAudioSession.interruptionNotification, object: audioSession)
+
+        MPNowPlayingInfoCenter.default().nowPlayingInfo = [
+            MPMediaItemPropertyTitle: "infinite lo-fi music",
+            MPMediaItemPropertyArtist: "infinifi"
+        ]
+
+        let cmdCenter = MPRemoteCommandCenter.shared()
+
+        cmdCenter.playCommand.isEnabled = true
+        cmdCenter.playCommand.addTarget { _ in
+            self.nextTrack()
+            return .success
+        }
+
+        cmdCenter.pauseCommand.isEnabled = true
+        cmdCenter.pauseCommand.addTarget { _ in
+            self.stop()
+            return .success
+        }
+    }
+
     func nextTrack() {
         playbackState = .loading
         Task {
@@ -82,6 +112,38 @@ class PlaybackManager: ObservableObject {
         }
     }
 
+    @objc
+    private func onAudioInterrupted(notification: Notification) {
+        guard let userInfo = notification.userInfo,
+              let typeValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
+              let interruptionType = AVAudioSession.InterruptionType(rawValue: typeValue)
+        else {
+            return
+        }
+
+        switch interruptionType {
+        case .began:
+            DispatchQueue.main.async {
+                self.stop()
+            }
+
+        case .ended:
+            guard let optionValue = userInfo[AVAudioSessionInterruptionOptionKey] as? UInt else {
+                return
+            }
+
+            let options = AVAudioSession.InterruptionOptions(rawValue: optionValue)
+            if options.contains(.shouldResume) {
+                DispatchQueue.main.async {
+                    self.nextTrack()
+                }
+            }
+
+        @unknown default:
+            break
+        }
+    }
+
     @objc
     private func playbackFinished() {
         NotificationCenter.default.removeObserver(self, name: AVPlayerItem.didPlayToEndTimeNotification, object: audioPlayer.currentItem)