Add iOS background playback support

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

.github/workflows/ios-validation.yml

@@ -0,0 +1,127 @@
+name: iOS validation
+
+on:
+  pull_request:
+    paths:
+      - "composeApp/src/commonMain/**"
+      - "composeApp/src/iosMain/**"
+      - "iosApp/**"
+      - "composeApp/build.gradle.kts"
+      - "gradle/**"
+      - "gradle.properties"
+      - "settings.gradle.kts"
+      - ".github/workflows/ios-validation.yml"
+  push:
+    branches:
+      - master
+    paths:
+      - "composeApp/src/commonMain/**"
+      - "composeApp/src/iosMain/**"
+      - "iosApp/**"
+      - "composeApp/build.gradle.kts"
+      - "gradle/**"
+      - "gradle.properties"
+      - "settings.gradle.kts"
+      - ".github/workflows/ios-validation.yml"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ios-validation-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  COMPOSE_WEBVIEW_REPO: KRTirtho/ComposeNativeWebview
+  COMPOSE_WEBVIEW_COMMIT: cbd36f88927298a28a2d64c6acf7ec3b2def6f9d
+
+jobs:
+  prepare-deps:
+    name: Prepare dependencies
+    runs-on: macos-latest
+    steps:
+      - name: Check out ComposeNativeWebview
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ env.COMPOSE_WEBVIEW_REPO }}
+          ref: ${{ env.COMPOSE_WEBVIEW_COMMIT }}
+          path: compose-webview
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Set up Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Publish ComposeNativeWebview locally
+        working-directory: compose-webview
+        run: |
+          chmod +x gradlew
+          ./gradlew publishToMavenLocal
+
+      - name: Upload Maven local repository
+        uses: actions/upload-artifact@v4
+        with:
+          name: maven-local
+          path: ~/.m2/repository/
+
+  build-ios:
+    name: Build unsigned iOS app
+    needs: prepare-deps
+    runs-on: macos-latest
+    timeout-minutes: 120
+    steps:
+      - name: Check out Spotube
+        uses: actions/checkout@v4
+
+      - name: Download Maven local repository
+        uses: actions/download-artifact@v4
+        with:
+          name: maven-local
+          path: ~/.m2/repository/
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Set up Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Set up Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Make Gradle executable
+        run: chmod +x gradlew
+
+      - name: Compile Kotlin iOS simulator target
+        run: ./gradlew :composeApp:compileKotlinIosSimulatorArm64
+
+      - name: Build unsigned iOS app
+        run: >
+          xcodebuild
+          -project iosApp/iosApp.xcodeproj
+          -scheme iosApp
+          -configuration Release
+          -sdk iphonesimulator
+          -destination 'generic/platform=iOS Simulator'
+          -derivedDataPath build/ios
+          CODE_SIGNING_ALLOWED=NO
+          CODE_SIGNING_REQUIRED=NO
+          CODE_SIGN_IDENTITY=""
+          DEVELOPMENT_TEAM=""
+          build

composeApp/src/commonMain/kotlin/org/spotube/spotube/core/audioplayer/DeviceAudioPlayerQueue.kt

@@ -18,7 +18,10 @@
 package org.spotube.spotube.core.audioplayer
 
 import org.spotube.plugin_interfaces.plugin_apis.audio.StreamProtocol
+import org.spotube.spotube.PlatformType
+import org.spotube.spotube.getPlatform
 import org.spotube.spotube.core.di.injectLogger
+import org.spotube.spotube.core.server.StreamingUrlRepository
 import org.spotube.spotube.modules.blacklist.BlacklistRepository
 import org.spotube.spotube.modules.library.local_tracks.media.LocalMediaCacheRepository
 import org.spotube.spotube.modules.plugin.PluginProvider
@@ -51,6 +54,7 @@ class DeviceAudioPlayerQueue(
     private val blacklistRepository: BlacklistRepository) : AudioPlayerQueue, KoinComponent {
 
     private val logger by injectLogger<DeviceAudioPlayerQueue>()
+    private val streamingUrlRepository by inject<StreamingUrlRepository>()
 
     private val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
 
@@ -515,7 +519,25 @@ class DeviceAudioPlayerQueue(
     private suspend fun QueueEntry.toMediaItem(): MediaItem? {
         return when (this) {
             is QueueEntry.StreamingTrack -> {
-                val resolvedUrl = url.ifBlank { buildStreamingUrl(track.id, protocol) }
+                val isIos = getPlatform().type == PlatformType.IOS
+                val requiresIosResolution = isIos && (
+                    url.isBlank() ||
+                        url.startsWith("http://127.0.0.1") ||
+                        url.startsWith("https://127.0.0.1") ||
+                        url.startsWith("http://[::1]") ||
+                        url.startsWith("https://[::1]") ||
+                        url.startsWith("http://localhost") ||
+                        url.startsWith("https://localhost"))
+                val resolvedStream = if (requiresIosResolution) {
+                    streamingUrlRepository.resolveStreamInfo(track)
+                } else {
+                    null
+                }
+                val resolvedUrl = if (requiresIosResolution) {
+                    resolvedStream?.url ?: buildStreamingUrl(track.id, protocol)
+                } else {
+                    url.ifBlank { buildStreamingUrl(track.id, protocol) }
+                }
                 if (resolvedUrl.isBlank()) return null
                 MediaItem(
                     title = track.title,
@@ -524,7 +546,7 @@ class DeviceAudioPlayerQueue(
                     duration = track.durationMs.milliseconds,
                     coverURL = artworkUrl.orEmpty(),
                     url = resolvedUrl,
-                    protocol = protocol)
+                    protocol = resolvedStream?.protocol ?: protocol)
             }
 
             is QueueEntry.LocalTrack -> {

composeApp/src/iosMain/kotlin/org/spotube/spotube/core/audioplayer/AudioPlayer.ios.kt

@@ -48,6 +48,7 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
     }.create()
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
     private val lock = Mutex()
+    private val mediaSession = IosMediaSession()
 
     private var disposed = false
 
@@ -94,8 +95,22 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
                 NativePlayerState.IDLE -> _playerState.tryEmit(PlayerState.IDLE)
                 NativePlayerState.OPENING,
                 NativePlayerState.BUFFERING -> _playerState.tryEmit(PlayerState.BUFFERING)
-                NativePlayerState.PLAYING -> _playerState.tryEmit(PlayerState.PLAYING)
+                NativePlayerState.PLAYING -> {
-                NativePlayerState.PAUSED -> _playerState.tryEmit(PlayerState.PAUSED)
+                    _playerState.tryEmit(PlayerState.PLAYING)
+                    mediaSession.update(
+                        _currentMediaItem.value,
+                        _position.value.inWholeMilliseconds / 1000.0,
+                        _duration.value.inWholeMilliseconds / 1000.0,
+                        true)
+                }
+                NativePlayerState.PAUSED -> {
+                    _playerState.tryEmit(PlayerState.PAUSED)
+                    mediaSession.update(
+                        _currentMediaItem.value,
+                        _position.value.inWholeMilliseconds / 1000.0,
+                        _duration.value.inWholeMilliseconds / 1000.0,
+                        false)
+                }
                 NativePlayerState.ENDED -> scope.launch { lock.withLock { onMediaEndedLocked() } }
             }
         }
@@ -103,6 +118,11 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
         override fun onTime(positionMs: Long) {
             if (disposed || positionMs < 0) return
             _position.tryEmit(positionMs.milliseconds)
+            mediaSession.update(
+                _currentMediaItem.value,
+                positionMs / 1000.0,
+                _duration.value.inWholeMilliseconds / 1000.0,
+                _playerState.value == PlayerState.PLAYING)
         }
 
         override fun onDuration(durationMs: Long) {
@@ -128,6 +148,12 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
 
     init {
         engine.setListener(engineListener)
+        mediaSession.configure(
+            onPlay = { scope.launch { play() } },
+            onPause = { scope.launch { pause() } },
+            onSeek = { seconds -> scope.launch { seekTo(seconds.milliseconds) } },
+            onNext = { scope.launch { skipToNext() } },
+            onPrevious = { scope.launch { skipToPrevious() } })
     }
 
     /** Loads [currentPlaylist] at [currentIndex] into the engine. Caller holds [lock]. */
@@ -167,6 +193,7 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
     actual override suspend fun play() {
         lock.withLock {
             if (disposed || currentPlaylist.isEmpty()) return
+            mediaSession.activate()
             if (currentIndex !in currentPlaylist.indices) {
                 currentIndex = 0
                 _currentMediaItem.tryEmit(currentPlaylist[0])
@@ -186,6 +213,12 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
         lock.withLock {
             if (disposed) return
             engine.stop()
+            mediaSession.deactivate()
+            mediaSession.update(
+                _currentMediaItem.value,
+                0.0,
+                _duration.value.inWholeMilliseconds / 1000.0,
+                false)
             engineHasMedia = false
             pendingStartMs = 0L
             _position.tryEmit(Duration.ZERO)
@@ -275,6 +308,11 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
             currentIndex = startPosition.coerceIn(0, currentPlaylist.lastIndex)
             _currentMediaItem.tryEmit(currentPlaylist[currentIndex])
             _duration.tryEmit(currentPlaylist[currentIndex].duration)
+            mediaSession.update(
+                _currentMediaItem.value,
+                0.0,
+                _duration.value.inWholeMilliseconds / 1000.0,
+                false)
 
             if (autoPlay) {
                 loadCurrentIntoEngineLocked(autoPlay = true)
@@ -414,6 +452,8 @@ actual class AudioPlayer actual constructor(context: Any) : AudioPlayerInterface
         disposed = true
         engine.setListener(null)
         engine.destroy()
+        mediaSession.deactivate()
+        mediaSession.clear()
         scope.cancel()
 
         originalPlaylist.clear()

composeApp/src/iosMain/kotlin/org/spotube/spotube/core/audioplayer/IosMediaSession.kt

@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2026 Kingkor Roy Tirtho and Spotube Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+@file:OptIn(ExperimentalForeignApi::class)
+
+package org.spotube.spotube.core.audioplayer
+
+import kotlinx.cinterop.ExperimentalForeignApi
+import platform.AVFAudio.AVAudioSession
+import platform.AVFAudio.AVAudioSessionCategoryPlayback
+import platform.AVFAudio.AVAudioSessionModeDefault
+import platform.Foundation.NSDictionary
+import platform.Foundation.NSMutableDictionary
+import platform.Foundation.NSNotificationCenter
+import platform.Foundation.NSOperationQueue
+import platform.MediaPlayer.MPChangePlaybackPositionCommandEvent
+import platform.MediaPlayer.MPMediaItemPropertyAlbumTitle
+import platform.MediaPlayer.MPMediaItemPropertyArtist
+import platform.MediaPlayer.MPMediaItemPropertyPlaybackDuration
+import platform.MediaPlayer.MPMediaItemPropertyTitle
+import platform.MediaPlayer.MPNowPlayingInfoCenter
+import platform.MediaPlayer.MPNowPlayingInfoPropertyElapsedPlaybackTime
+import platform.MediaPlayer.MPNowPlayingInfoPropertyPlaybackRate
+import platform.MediaPlayer.MPRemoteCommand
+import platform.MediaPlayer.MPRemoteCommandCenter
+import platform.MediaPlayer.MPRemoteCommandHandlerStatusCommandFailed
+import platform.MediaPlayer.MPRemoteCommandHandlerStatusSuccess
+
+internal class IosMediaSession {
+    private val audioSession = AVAudioSession.sharedInstance()
+    private val nowPlayingInfoCenter = MPNowPlayingInfoCenter.defaultCenter()
+    private val remoteCommandCenter = MPRemoteCommandCenter.sharedCommandCenter()
+
+    private var configured = false
+    private val notificationCenter = NSNotificationCenter.defaultCenter()
+    private val notificationTokens = mutableListOf<Any>()
+    private val remoteCommandTokens = mutableListOf<Pair<MPRemoteCommand, Any>>()
+    private var onPlay: (() -> Unit)? = null
+    private var onPause: (() -> Unit)? = null
+    private var onSeek: ((Double) -> Unit)? = null
+    private var onNext: (() -> Unit)? = null
+    private var onPrevious: (() -> Unit)? = null
+
+    fun configure(
+        onPlay: () -> Unit,
+        onPause: () -> Unit,
+        onSeek: (Double) -> Unit,
+        onNext: () -> Unit,
+        onPrevious: () -> Unit
+    ) {
+        this.onPlay = onPlay
+        this.onPause = onPause
+        this.onSeek = onSeek
+        this.onNext = onNext
+        this.onPrevious = onPrevious
+
+        if (configured) return
+        configured = true
+
+        audioSession.setCategory(
+            category = AVAudioSessionCategoryPlayback,
+            mode = AVAudioSessionModeDefault,
+            options = 0u,
+            error = null)
+        registerAudioSessionNotifications()
+        registerRemoteCommands()
+    }
+
+    fun activate() {
+        audioSession.setActive(true, error = null)
+    }
+
+    fun deactivate() {
+        audioSession.setActive(false, error = null)
+    }
+
+    fun update(
+        item: MediaItem?,
+        positionSeconds: Double,
+        durationSeconds: Double,
+        isPlaying: Boolean
+    ) {
+        if (item == null) {
+            nowPlayingInfoCenter.nowPlayingInfo = null
+            return
+        }
+
+        val info = NSMutableDictionary()
+        info.setObject(item.title, forKey = MPMediaItemPropertyTitle)
+        info.setObject(item.artist, forKey = MPMediaItemPropertyArtist)
+        item.album.takeIf { it.isNotBlank() }?.let {
+            info.setObject(it, forKey = MPMediaItemPropertyAlbumTitle)
+        }
+        if (durationSeconds.isFinite() && durationSeconds > 0) {
+            info.setObject(durationSeconds, forKey = MPMediaItemPropertyPlaybackDuration)
+        }
+        if (positionSeconds.isFinite() && positionSeconds >= 0) {
+            info.setObject(positionSeconds, forKey = MPNowPlayingInfoPropertyElapsedPlaybackTime)
+        }
+        info.setObject(if (isPlaying) 1.0 else 0.0, forKey = MPNowPlayingInfoPropertyPlaybackRate)
+        nowPlayingInfoCenter.nowPlayingInfo = info as NSDictionary
+    }
+
+    fun clear() {
+        nowPlayingInfoCenter.nowPlayingInfo = null
+        notificationTokens.forEach { notificationCenter.removeObserver(it) }
+        notificationTokens.clear()
+        remoteCommandTokens.forEach { (command, token) -> command.removeTarget(token) }
+        remoteCommandTokens.clear()
+        configured = false
+        onPlay = null
+        onPause = null
+        onSeek = null
+        onNext = null
+        onPrevious = null
+    }
+
+    private fun registerAudioSessionNotifications() {
+        notificationTokens += notificationCenter.addObserverForName(
+            name = platform.AVFAudio.AVAudioSessionInterruptionNotification,
+            `object` = audioSession,
+            queue = NSOperationQueue.mainQueue()) { notification ->
+            val type = notification?.userInfo?.get(
+                platform.AVFAudio.AVAudioSessionInterruptionTypeKey) as? Number
+            if (type?.intValue == platform.AVFAudio.AVAudioSessionInterruptionTypeBegan) {
+                onPause?.invoke()
+            } else if (type?.intValue == platform.AVFAudio.AVAudioSessionInterruptionTypeEnded) {
+                activate()
+                val options = notification?.userInfo?.get(
+                    platform.AVFAudio.AVAudioSessionInterruptionOptionKey) as? Number
+                val shouldResume = (options?.intValue ?: 0) and
+                    platform.AVFAudio.AVAudioSessionInterruptionOptionShouldResume.toInt() != 0
+                if (shouldResume) onPlay?.invoke()
+            }
+        }
+    }
+
+    private fun registerRemoteCommands() {
+        remoteCommandTokens += remoteCommandCenter.playCommand to
+            remoteCommandCenter.playCommand.addTargetWithHandler {
+            onPlay?.invoke()
+            MPRemoteCommandHandlerStatusSuccess
+        }
+        remoteCommandTokens += remoteCommandCenter.pauseCommand to
+            remoteCommandCenter.pauseCommand.addTargetWithHandler {
+            onPause?.invoke()
+            MPRemoteCommandHandlerStatusSuccess
+        }
+        remoteCommandTokens += remoteCommandCenter.changePlaybackPositionCommand to
+            remoteCommandCenter.changePlaybackPositionCommand.addTargetWithHandler { event ->
+            val position = (event as? MPChangePlaybackPositionCommandEvent)?.positionTime
+            if (position != null && position.isFinite() && position >= 0) {
+                onSeek?.invoke(position)
+                MPRemoteCommandHandlerStatusSuccess
+            } else {
+                MPRemoteCommandHandlerStatusCommandFailed
+            }
+        }
+        remoteCommandTokens += remoteCommandCenter.nextTrackCommand to
+            remoteCommandCenter.nextTrackCommand.addTargetWithHandler {
+            onNext?.invoke()
+            MPRemoteCommandHandlerStatusSuccess
+        }
+        remoteCommandTokens += remoteCommandCenter.previousTrackCommand to
+            remoteCommandCenter.previousTrackCommand.addTargetWithHandler {
+            onPrevious?.invoke()
+            MPRemoteCommandHandlerStatusSuccess
+        }
+    }
+}

iosApp/iosApp/Info.plist

@@ -4,6 +4,10 @@
 <dict>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 	<key>CFBundleURLTypes</key>
 	<array>
 		<dict>