550 lines
18 KiB
Kotlin
550 lines
18 KiB
Kotlin
package at.lockstep.player.playback
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import android.app.PendingIntent
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import android.app.Service
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import android.content.Intent
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import android.content.pm.ServiceInfo
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import android.net.Uri
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import android.os.Binder
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import android.os.Build
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import android.os.IBinder
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import android.support.v4.media.MediaMetadataCompat
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import android.support.v4.media.session.MediaSessionCompat
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import android.support.v4.media.session.PlaybackStateCompat
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import androidx.core.app.NotificationCompat
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import androidx.media.app.NotificationCompat.MediaStyle
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import androidx.media3.common.MediaItem
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import androidx.media3.common.Player
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import androidx.media3.exoplayer.ExoPlayer
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import at.lockstep.player.LockstepApplication
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import at.lockstep.player.MainActivity
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import at.lockstep.player.R
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.SupervisorJob
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.flow.MutableSharedFlow
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import kotlinx.coroutines.flow.MutableStateFlow
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import kotlinx.coroutines.flow.SharedFlow
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import kotlinx.coroutines.flow.StateFlow
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import kotlinx.coroutines.flow.asSharedFlow
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import kotlinx.coroutines.flow.asStateFlow
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import kotlinx.coroutines.channels.BufferOverflow
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import kotlinx.coroutines.isActive
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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/**
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* Local MP3 playback via Media3 [ExoPlayer]. UI progress and beat taps use
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* [ExoPlayer.getCurrentPosition] (milliseconds from the start of the current media item), which is
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* the same timeline used for seeking and end-of-track reporting — see Media3
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* [Player] / [ExoPlayer] documentation.
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*/
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class PlaybackService : Service() {
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private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
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private lateinit var mediaSession: MediaSessionCompat
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private lateinit var app: LockstepApplication
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private val binder = LocalBinder()
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private var player: ExoPlayer? = null
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private var positionPollJob: Job? = null
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private val _uiState = MutableStateFlow(PlaybackUiState.initial())
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val uiState: StateFlow<PlaybackUiState> = _uiState.asStateFlow()
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private val _trackBoundary =
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MutableSharedFlow<TrackBoundaryEvent>(
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extraBufferCapacity = 32,
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onBufferOverflow = BufferOverflow.DROP_OLDEST,
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)
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val trackBoundaryEvents: SharedFlow<TrackBoundaryEvent> = _trackBoundary.asSharedFlow()
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private var queue: List<TrackQueueItem> = emptyList()
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private var index: Int = 0
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private val playerListener =
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object : Player.Listener {
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override fun onPlaybackStateChanged(playbackState: Int) {
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if (playbackState == Player.STATE_ENDED) {
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if (queue.isEmpty()) {
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return
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}
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if (index < queue.lastIndex) {
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emitTrackBoundaryForQueueIndex(
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index,
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TrackBoundaryReason.ADVANCED_TO_OTHER_TRACK,
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)
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index++
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publishCurrentTrack()
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} else {
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emitTrackBoundaryForQueueIndex(
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index,
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TrackBoundaryReason.LAST_TRACK_FINISHED,
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)
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setPlaying(false)
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}
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}
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}
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}
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private fun emitTrackBoundaryForQueueIndex(
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i: Int,
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reason: TrackBoundaryReason,
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) {
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val item = queue.getOrNull(i) ?: return
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scope.launch {
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_trackBoundary.emit(
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TrackBoundaryEvent(
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trackId = item.id,
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title = item.title,
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artist = item.artist,
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queueIndex = i,
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queueSize = queue.size,
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reason = reason,
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),
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)
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}
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}
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inner class LocalBinder : Binder() {
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fun getService(): PlaybackService = this@PlaybackService
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}
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override fun onBind(intent: Intent?): IBinder = binder
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override fun onCreate() {
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super.onCreate()
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app = application as LockstepApplication
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mediaSession = MediaSessionCompat(this, "LockstepPlayback")
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mediaSession.setCallback(
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object : MediaSessionCompat.Callback() {
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override fun onPlay() {
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setPlaying(true)
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}
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override fun onPause() {
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setPlaying(false)
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}
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override fun onSkipToNext() {
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skipDelta(1)
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}
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override fun onSkipToPrevious() {
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skipDelta(-1)
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}
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override fun onSeekTo(pos: Long) {
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val p = player ?: return
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p.seekTo(pos)
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updateProgressFromPlayer()
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}
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},
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)
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mediaSession.isActive = true
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}
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override fun onStartCommand(
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intent: Intent?,
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flags: Int,
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startId: Int,
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): Int {
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when (intent?.action) {
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ACTION_START_PLAYLIST -> {
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val pid = intent.getStringExtra(EXTRA_PLAYLIST_ID)
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if (pid != null) {
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goForegroundPlaceholder()
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startPlaylist(pid)
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}
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}
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ACTION_TOGGLE_PAUSE -> togglePlaying()
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ACTION_SKIP_NEXT -> skipDelta(1)
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ACTION_SKIP_PREVIOUS -> skipDelta(-1)
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}
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return START_STICKY
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}
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private fun goForegroundPlaceholder() {
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val notification =
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NotificationCompat.Builder(
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this,
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LockstepApplication.PLAYBACK_NOTIFICATION_CHANNEL_ID,
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).setContentTitle(getString(R.string.notification_loading_playlist))
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.setContentText(getString(R.string.app_name))
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.setSmallIcon(R.drawable.ic_play_arrow_24)
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.setContentIntent(contentActivityIntent())
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.setOngoing(true)
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.build()
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
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startForeground(
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LockstepApplication.PLAYBACK_NOTIFICATION_ID,
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notification,
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ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PLAYBACK,
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)
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} else {
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startForeground(
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LockstepApplication.PLAYBACK_NOTIFICATION_ID,
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notification,
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)
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}
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}
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private fun ensurePlayer(): ExoPlayer {
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player?.let {
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return it
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}
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return ExoPlayer.Builder(this)
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.build()
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.also {
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it.addListener(playerListener)
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player = it
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startPositionPolling()
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}
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}
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private fun startPositionPolling() {
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positionPollJob?.cancel()
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positionPollJob =
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scope.launch {
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while (isActive) {
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delay(UPDATE_INTERVAL_MS)
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if (player != null && queue.isNotEmpty()) {
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updateProgressFromPlayer()
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}
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}
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}
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}
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private fun releasePlayer() {
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positionPollJob?.cancel()
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positionPollJob = null
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player?.removeListener(playerListener)
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player?.release()
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player = null
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}
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private fun startPlaylist(pid: String) {
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scope.launch(Dispatchers.IO) {
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val rows = app.playlistRepository.getTracks(pid)
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val pairingByTrackId =
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app.database.pairingDao().listForPlaylist(pid).associateBy { it.trackId }
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queue =
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rows.mapNotNull { row ->
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val tid = row.trackId ?: return@mapNotNull null
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val pairing = pairingByTrackId[tid] ?: return@mapNotNull null
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val uriStr = pairing.localUri
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if (uriStr.isNullOrBlank() || pairing.pairingError != null) {
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return@mapNotNull null
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}
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val hint =
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row.durationMs?.takeIf { it > 0 }
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?: DEFAULT_DURATION_HINT_MS
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TrackQueueItem(
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id = tid,
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title = row.trackName ?: "—",
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artist = row.artistName ?: "—",
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localUri = Uri.parse(uriStr),
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durationMsHint = hint,
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)
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}
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index = 0
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if (queue.isEmpty()) {
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withContext(Dispatchers.Main) {
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releasePlayer()
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stopForeground(STOP_FOREGROUND_REMOVE)
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stopSelf()
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}
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return@launch
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}
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withContext(Dispatchers.Main) {
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ensurePlayer()
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setPlaying(true)
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publishCurrentTrack()
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refreshForegroundNotification()
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}
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}
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}
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private fun publishCurrentTrack() {
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val item = queue.getOrNull(index) ?: return
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applyCurrentMediaItem(item)
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val durationSec =
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(player?.duration?.takeIf { it > 0 }?.div(1000)?.toInt())
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?: (item.durationMsHint / 1000).coerceAtLeast(1)
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_uiState.value =
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PlaybackUiState(
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title = item.title,
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artist = item.artist,
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progress = 0f,
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durationSeconds = durationSec,
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isPlaying = _uiState.value.isPlaying,
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currentTrackId = item.id,
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currentQueueIndex = index,
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queueSize = queue.size,
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)
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updateProgressFromPlayer()
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updateSessionMetadata(item, durationSec)
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updatePlaybackStateFromPlayer()
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refreshForegroundNotification()
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}
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private fun applyCurrentMediaItem(item: TrackQueueItem) {
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val uri = item.localUri ?: return
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val p = ensurePlayer()
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p.setMediaItem(MediaItem.fromUri(uri))
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p.prepare()
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p.playWhenReady = _uiState.value.isPlaying
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}
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private fun updateSessionMetadata(
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item: TrackQueueItem,
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durationSec: Int,
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) {
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mediaSession.setMetadata(
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MediaMetadataCompat.Builder()
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.putString(MediaMetadataCompat.METADATA_KEY_TITLE, item.title)
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.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, item.artist)
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.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, durationSec * 1000L)
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.build(),
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)
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}
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private fun currentDurationMs(): Long {
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val p = player
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val fromPlayer = p?.duration?.takeIf { it > 0 }
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if (fromPlayer != null) {
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return fromPlayer
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}
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val hint = queue.getOrNull(index)?.durationMsHint?.toLong() ?: DEFAULT_DURATION_HINT_MS.toLong()
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return hint
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}
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private fun updateProgressFromPlayer() {
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val p = player ?: return
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val durationMs = currentDurationMs().coerceAtLeast(1L)
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val positionMs = p.currentPosition.coerceIn(0L, durationMs)
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if (queue.isEmpty()) {
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return
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}
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val progress = (positionMs.toFloat() / durationMs.toFloat()).coerceIn(0f, 1f)
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val durationSec = (durationMs / 1000L).toInt().coerceAtLeast(1)
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_uiState.value =
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_uiState.value.copy(
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progress = progress,
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durationSeconds = durationSec,
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currentTrackId = queue.getOrNull(index)?.id ?: _uiState.value.currentTrackId,
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currentQueueIndex = index,
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queueSize = queue.size,
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)
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updatePlaybackStateFromPlayer()
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}
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private fun updatePlaybackStateFromPlayer() {
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val p = player
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val positionMs = p?.currentPosition ?: 0L
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val actions =
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PlaybackStateCompat.ACTION_PLAY or
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PlaybackStateCompat.ACTION_PAUSE or
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PlaybackStateCompat.ACTION_SKIP_TO_NEXT or
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PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS or
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PlaybackStateCompat.ACTION_SEEK_TO
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val state =
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if (_uiState.value.isPlaying && p?.isPlaying == true) {
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PlaybackStateCompat.STATE_PLAYING
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} else {
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PlaybackStateCompat.STATE_PAUSED
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}
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mediaSession.setPlaybackState(
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PlaybackStateCompat.Builder()
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.setActions(actions)
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.setState(state, positionMs, 1f)
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.build(),
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)
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}
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private fun setPlaying(playing: Boolean) {
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_uiState.value = _uiState.value.copy(isPlaying = playing)
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player?.playWhenReady = playing
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updatePlaybackStateFromPlayer()
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refreshForegroundNotification()
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}
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private fun togglePlaying() {
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if (queue.isEmpty()) return
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setPlaying(!_uiState.value.isPlaying)
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}
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private fun skipDelta(delta: Int) {
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if (queue.isEmpty()) {
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return
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}
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val oldIndex = index
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val newIndex = (oldIndex + delta).coerceIn(0, queue.lastIndex)
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if (newIndex == oldIndex) {
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return
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}
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emitTrackBoundaryForQueueIndex(oldIndex, TrackBoundaryReason.ADVANCED_TO_OTHER_TRACK)
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index = newIndex
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publishCurrentTrack()
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}
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fun requestTogglePause() {
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togglePlaying()
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}
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fun requestSkipNext() {
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skipDelta(1)
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}
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fun requestSkipPrevious() {
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skipDelta(-1)
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}
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fun requestSeek(fraction: Float) {
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if (queue.isEmpty()) return
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val p = player ?: return
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val durationMs = currentDurationMs()
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val positionMs = (fraction.coerceIn(0f, 1f) * durationMs).toLong()
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p.seekTo(positionMs)
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updateProgressFromPlayer()
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}
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/**
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* Milliseconds from the start of the current track — same timebase as [ExoPlayer.getCurrentPosition].
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* May be called from any thread per Media3 [Player] contract.
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*/
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fun getPlaybackPositionMs(): Long {
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return player?.currentPosition ?: 0L
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}
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private fun refreshForegroundNotification() {
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if (queue.isEmpty()) return
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val notification = buildNotification()
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if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
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startForeground(
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LockstepApplication.PLAYBACK_NOTIFICATION_ID,
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notification,
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ServiceInfo.FOREGROUND_SERVICE_TYPE_MEDIA_PLAYBACK,
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)
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} else {
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startForeground(
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LockstepApplication.PLAYBACK_NOTIFICATION_ID,
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notification,
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)
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}
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}
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private fun contentActivityIntent(): PendingIntent =
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PendingIntent.getActivity(
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this,
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0,
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Intent(this, MainActivity::class.java),
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PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
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)
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private fun buildNotification(): android.app.Notification {
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val prev =
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PendingIntent.getService(
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this,
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1,
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Intent(this, PlaybackService::class.java).setAction(ACTION_SKIP_PREVIOUS),
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PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
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)
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val next =
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PendingIntent.getService(
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this,
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2,
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Intent(this, PlaybackService::class.java).setAction(ACTION_SKIP_NEXT),
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PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
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)
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val toggle =
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PendingIntent.getService(
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this,
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3,
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Intent(this, PlaybackService::class.java).setAction(ACTION_TOGGLE_PAUSE),
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PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
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)
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val playing = _uiState.value.isPlaying
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val style =
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MediaStyle()
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.setMediaSession(mediaSession.sessionToken)
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.setShowActionsInCompactView(0, 1, 2)
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return NotificationCompat.Builder(
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this,
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LockstepApplication.PLAYBACK_NOTIFICATION_CHANNEL_ID,
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).setContentTitle(_uiState.value.title)
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.setContentText(_uiState.value.artist)
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.setSmallIcon(R.drawable.ic_play_arrow_24)
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.setContentIntent(contentActivityIntent())
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.setOnlyAlertOnce(true)
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.addAction(R.drawable.ic_skip_previous_24, getString(R.string.notification_prev), prev)
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.addAction(
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if (playing) R.drawable.ic_pause_24 else R.drawable.ic_play_arrow_24,
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getString(R.string.notification_play_pause),
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toggle,
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)
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.addAction(R.drawable.ic_skip_next_24, getString(R.string.notification_next), next)
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.setStyle(style)
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.build()
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}
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override fun onDestroy() {
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positionPollJob?.cancel()
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releasePlayer()
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mediaSession.run {
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isActive = false
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release()
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}
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super.onDestroy()
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}
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data class PlaybackUiState(
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val title: String,
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val artist: String,
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val progress: Float,
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val durationSeconds: Int,
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val isPlaying: Boolean,
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val currentTrackId: String?,
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val currentQueueIndex: Int,
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val queueSize: Int,
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) {
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companion object {
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fun initial() =
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PlaybackUiState(
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title = "—",
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artist = "—",
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progress = 0f,
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durationSeconds = 180,
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isPlaying = false,
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currentTrackId = null,
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currentQueueIndex = 0,
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queueSize = 0,
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)
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}
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}
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private data class TrackQueueItem(
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val id: String,
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val title: String,
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val artist: String,
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val localUri: Uri?,
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/** Fallback when [ExoPlayer] has not reported duration yet (from jukebox or default). */
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val durationMsHint: Int,
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)
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companion object {
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private const val UPDATE_INTERVAL_MS = 250L
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private const val DEFAULT_DURATION_HINT_MS = 180_000
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const val ACTION_START_PLAYLIST = "at.lockstep.player.action.START_PLAYLIST"
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const val ACTION_TOGGLE_PAUSE = "at.lockstep.player.action.TOGGLE_PAUSE"
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const val ACTION_SKIP_NEXT = "at.lockstep.player.action.SKIP_NEXT"
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const val ACTION_SKIP_PREVIOUS = "at.lockstep.player.action.SKIP_PREVIOUS"
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const val EXTRA_PLAYLIST_ID = "playlist_id"
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}
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}
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