PlaylistManager.kt 26.2 KB
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package org.videolan.vlc.media

import android.content.Intent
import android.net.Uri
import android.support.annotation.MainThread
import android.support.v4.content.LocalBroadcastManager
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import android.support.v7.preference.PreferenceManager
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import android.text.TextUtils
import android.util.Log
import android.widget.Toast
import kotlinx.coroutines.experimental.CoroutineStart
import kotlinx.coroutines.experimental.android.UI
import kotlinx.coroutines.experimental.async
import kotlinx.coroutines.experimental.launch
import org.videolan.libvlc.Media
import org.videolan.libvlc.MediaPlayer
import org.videolan.medialibrary.Medialibrary
import org.videolan.medialibrary.media.MediaWrapper
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import org.videolan.vlc.BuildConfig
import org.videolan.vlc.PlaybackService
import org.videolan.vlc.R
import org.videolan.vlc.VLCApplication
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import org.videolan.vlc.gui.preferences.PreferencesActivity
import org.videolan.vlc.gui.preferences.PreferencesFragment
import org.videolan.vlc.gui.video.VideoPlayerActivity
import org.videolan.vlc.util.*
import java.util.*

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private const val TAG = "VLC/PlaylistManager"
private const val PREVIOUS_LIMIT_DELAY = 5000L
private const val AUDIO_REPEAT_MODE_KEY = "audio_repeat_mode"
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class PlaylistManager(val service: PlaybackService) : MediaWrapperList.EventListener, Media.EventListener {

    private val medialibrary by lazy(LazyThreadSafetyMode.NONE) { Medialibrary.getInstance() }
    val player by lazy(LazyThreadSafetyMode.NONE) { PlayerController() }
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    private val settings by lazy(LazyThreadSafetyMode.NONE) { PreferenceManager.getDefaultSharedPreferences(service) }
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    private val ctx by lazy(LazyThreadSafetyMode.NONE) { VLCApplication.getAppContext() }
    private val mediaList = MediaWrapperList()
    var currentIndex = -1
    private var nextIndex = -1
    private var prevIndex = -1
    private var previous = Stack<Int>()
    var repeating = Constants.REPEAT_NONE
    var shuffling = false
    var videoBackground = false
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        private set
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    var isBenchmark = false
    var isHardware = false
    private var parsed = false
    var savedTime = 0L
    private var random = Random(System.currentTimeMillis())
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    private var newMedia = false
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    @Volatile
    private var expanding = false
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    fun hasMedia() = mediaList.size() != 0
    fun hasCurrentMedia() = isValidPosition(currentIndex)

    fun hasPlaylist() = mediaList.size() > 1

    fun canShuffle() = mediaList.size() > 2

    fun isValidPosition(position: Int) = position in 0 until mediaList.size()

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    init {
        if (settings.getBoolean("audio_save_repeat", false)) repeating = settings.getInt(AUDIO_REPEAT_MODE_KEY, Constants.REPEAT_NONE)
    }

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    /**
     * Loads a selection of files (a non-user-supplied collection of media)
     * into the primary or "currently playing" playlist.
     *
     * @param mediaPathList A list of locations to load
     * @param position The position to start playing at
     */
    @MainThread
    fun loadLocations(mediaPathList: List<String>, position: Int) {
        val mediaList = ArrayList<MediaWrapper>()

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        for (location in mediaPathList) {
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            var mediaWrapper = medialibrary.getMedia(location)
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            if (mediaWrapper === null) {
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                if (!location.validateLocation()) {
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                    Log.w(TAG, "Invalid location $location")
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                    service.showToast(service.resources.getString(R.string.invalid_location, location), Toast.LENGTH_SHORT)
                    continue
                }
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                Log.v(TAG, "Creating on-the-fly Media object for $location")
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                mediaWrapper = MediaWrapper(Uri.parse(location))
            }
            mediaList.add(mediaWrapper)
        }
        load(mediaList, position)
    }

    fun load(list: List<MediaWrapper>, position: Int) {
        mediaList.removeEventListener(this)
        mediaList.clear()
        previous.clear()
        for (media in list) mediaList.add(media)
        if (!hasMedia()) {
            Log.w(TAG, "Warning: empty media list, nothing to play !")
            return
        }
        currentIndex = if (isValidPosition(position)) position else 0

        // Add handler after loading the list
        mediaList.addEventListener(this)
        playIndex(position)
        onPlaylistLoaded()
    }

    @Volatile
    private var loadingLastPlaylist = false
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    fun loadLastPlaylist(type: Int) : Boolean {
        if (loadingLastPlaylist) return false
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        loadingLastPlaylist = true
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        val audio = type == Constants.PLAYLIST_TYPE_AUDIO
        val currentMedia = settings.getString(if (audio) "current_song" else "current_media", "")
        if ("" == currentMedia) return false
        val locations = settings.getString(if (audio) "audio_list" else "media_list", "").split(" ".toRegex()).dropLastWhile({ it.isEmpty() }).toTypedArray()
        if (Util.isArrayEmpty(locations)) return false
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        launch(UI, CoroutineStart.UNDISPATCHED) {
            val playList = async {
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                locations.map { Uri.decode(it) }.mapTo(ArrayList(locations.size)) { MediaWrapper(Uri.parse(it)) }
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            }.await()
            // load playlist
            shuffling = settings.getBoolean(if (audio) "audio_shuffling" else "media_shuffling", false)
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            repeating = settings.getInt(if (audio) "audio_repeating" else "media_repeating", Constants.REPEAT_NONE)
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            val position = settings.getInt(if (audio) "position_in_audio_list" else "position_in_media_list", 0)
            savedTime = settings.getLong(if (audio) "position_in_song" else "position_in_media", -1)
            if (!audio) {
                if (position < playList.size && settings.getBoolean(PreferencesActivity.VIDEO_PAUSED, false)) {
                    playList[position].addFlags(MediaWrapper.MEDIA_PAUSED)
                }
                val rate = settings.getFloat(PreferencesActivity.VIDEO_SPEED, player.getRate())
                if (rate != 1.0f) player.setRate(rate, false)
            }
            load(playList, position)
            loadingLastPlaylist = false
        }
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        return true
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    }

    private fun onPlaylistLoaded() {
        service.onPlaylistLoaded()
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        launch(UI, CoroutineStart.UNDISPATCHED) {
            determinePrevAndNextIndices()
            launch { mediaList.updateWithMLMeta() }
        }
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    }

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    fun play() {
        if (hasMedia()) player.play()
    }
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    fun pause() {
        if (player.pause()) savePosition()
    }

    @MainThread
    fun next() {
        val size = mediaList.size()
        previous.push(currentIndex)
        currentIndex = nextIndex
        if (size == 0 || currentIndex < 0 || currentIndex >= size) {
            Log.w(TAG, "Warning: invalid next index, aborted !")
            //Close video player if started
            LocalBroadcastManager.getInstance(ctx).sendBroadcast(Intent(Constants.EXIT_PLAYER))
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            stop()
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            return
        }
        videoBackground = !player.isVideoPlaying() && player.canSwitchToVideo()
        playIndex(currentIndex)
    }

    fun stop(systemExit: Boolean = false) {
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        if (hasCurrentMedia()) {
            savePosition()
            saveMediaMeta()
        }
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        player.releaseMedia()
        mediaList.removeEventListener(this)
        previous.clear()
        currentIndex = -1
        mediaList.clear()
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        if (systemExit) player.release()
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        else player.restart()
        service.onPlaybackStopped()
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    }

    @MainThread
    fun previous(force : Boolean) {
        if (hasPrevious() && currentIndex > 0 &&
                (force || !player.seekable || player.getTime() < PREVIOUS_LIMIT_DELAY)) {
            val size = mediaList.size()
            currentIndex = prevIndex
            if (previous.size > 0) previous.pop()
            if (size == 0 || prevIndex < 0 || currentIndex >= size) {
                Log.w(TAG, "Warning: invalid previous index, aborted !")
                player.stop()
                return
            }
            playIndex(currentIndex)
        } else player.setPosition(0F)
    }

    fun shuffle() {
        if (shuffling) previous.clear()
        shuffling = !shuffling
        savePosition()
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }

    fun setRepeatType(repeatType: Int) {
        repeating = repeatType
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        if (isAudioList() && settings.getBoolean("audio_save_repeat", false))
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            settings.edit().putInt(AUDIO_REPEAT_MODE_KEY, repeating).apply()
        savePosition()
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }

    fun playIndex(index: Int, flags: Int = 0) {
        if (mediaList.size() == 0) {
            Log.w(TAG, "Warning: empty media list, nothing to play !")
            return
        }
        currentIndex = if (isValidPosition(index)) {
            index
        } else {
            Log.w(TAG, "Warning: index $index out of bounds")
            0
        }

        val mw = mediaList.getMedia(index) ?: return
        val isVideoPlaying = mw.type == MediaWrapper.TYPE_VIDEO && player.isVideoPlaying()
        if (!videoBackground && isVideoPlaying) mw.addFlags(MediaWrapper.MEDIA_VIDEO)
        if (videoBackground) mw.addFlags(MediaWrapper.MEDIA_FORCE_AUDIO)
        parsed = false
        player.switchToVideo = false
        if (TextUtils.equals(mw.uri.scheme, "content")) MediaUtils.retrieveMediaTitle(mw)

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        launch(UI, CoroutineStart.UNDISPATCHED) {
            if (mw.hasFlag(MediaWrapper.MEDIA_FORCE_AUDIO) && player.getAudioTracksCount() == 0) {
                determinePrevAndNextIndices(true)
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                skipMedia()
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            } else if (mw.type != MediaWrapper.TYPE_VIDEO || isVideoPlaying || player.hasRenderer
                    || mw.hasFlag(MediaWrapper.MEDIA_FORCE_AUDIO)) {
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                val uri = FileUtils.getUri(mw.uri)
                if (uri == null) {
                    skipMedia()
                    return@launch
                }
                val media = Media(VLCInstance.get(), uri)
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                VLCOptions.setMediaOptions(media, ctx, flags or mw.flags)
                /* keeping only video during benchmark */
                if (isBenchmark) {
                    media.addOption(":no-audio")
                    media.addOption(":no-spu")
                    if (isHardware) {
                        media.addOption(":codec=mediacodec_ndk,mediacodec_jni,none")
                        isHardware = false
                    }
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                }
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                media.setEventListener(this@PlaylistManager)
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                player.setSlaves(media, mw)
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                player.startPlayback(media, mediaplayerEventListener)
                media.release()
                if (savedTime <= 0L && mw.time >= 0L && mw.isPodcast) savedTime = mw.time
                determinePrevAndNextIndices()
                service.onNewPlayback(mw)
                if (settings.getBoolean(PreferencesFragment.PLAYBACK_HISTORY, true)) launch {
                    var id = mw.id
                    if (id == 0L) {
                        var internalMedia = medialibrary.findMedia(mw)
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                        if (internalMedia != null && internalMedia.id != 0L) id = internalMedia.id
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                        else {
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                            internalMedia = medialibrary.addMedia(Uri.decode(mw.uri.toString()))
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                            if (internalMedia != null) id = internalMedia.id
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                        }
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                    }
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                    medialibrary.increasePlayCount(id)
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                }
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                saveCurrentMedia()
                newMedia = true
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            } else { //Start VideoPlayer for first video, it will trigger playIndex when ready.
                player.stop()
                VideoPlayerActivity.startOpened(ctx, mw.uri, currentIndex)
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            }
        }
    }

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    private fun skipMedia() {
        if (currentIndex != nextIndex) next()
        else stop(false)
    }

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    fun onServiceDestroyed() {
        player.release()
    }

    @MainThread
    fun switchToVideo(): Boolean {
        val media = getCurrentMedia()
        if (media === null || media.hasFlag(MediaWrapper.MEDIA_FORCE_AUDIO) || !player.canSwitchToVideo())
            return false
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        val hasRenderer = player.hasRenderer
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        videoBackground = false
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        if (player.isVideoPlaying() && !hasRenderer) {//Player is already running, just send it an intent
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            player.setVideoTrackEnabled(true)
            LocalBroadcastManager.getInstance(service).sendBroadcast(
                    VideoPlayerActivity.getIntent(Constants.PLAY_FROM_SERVICE,
                            media, false, currentIndex))
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        } else if (!player.switchToVideo) { //Start the video player
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            VideoPlayerActivity.startOpened(VLCApplication.getAppContext(), media.uri, currentIndex)
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            if (!hasRenderer) player.switchToVideo = true
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        }
        return true
    }

    fun setVideoTrackEnabled(enabled: Boolean) {
        if (!hasMedia() || !player.isPlaying()) return
        if (enabled) getCurrentMedia()?.addFlags(MediaWrapper.MEDIA_VIDEO)
        else getCurrentMedia()?.removeFlags(MediaWrapper.MEDIA_VIDEO)
        player.setVideoTrackEnabled(enabled)
    }

    fun hasPrevious() = prevIndex != -1

    fun hasNext() = nextIndex != -1

    override fun onItemAdded(index: Int, mrl: String?) {
        if (BuildConfig.DEBUG) Log.i(TAG, "CustomMediaListItemAdded")
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        if (currentIndex >= index && !expanding) ++currentIndex
        launch(UI, CoroutineStart.UNDISPATCHED) {
            determinePrevAndNextIndices()
            executeUpdate()
            saveMediaList()
        }
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    }

    override fun onItemRemoved(index: Int, mrl: String?) {
        if (BuildConfig.DEBUG) Log.i(TAG, "CustomMediaListItemDeleted")
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        val currentRemoved = currentIndex == index
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        if (currentIndex >= index && !expanding) --currentIndex
        launch(UI, CoroutineStart.UNDISPATCHED) {
            determinePrevAndNextIndices()
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            if (currentRemoved && !expanding) {
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                when {
                    nextIndex != -1 -> next()
                    currentIndex != -1 -> playIndex(currentIndex, 0)
                    else -> stop()
                }
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            }
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            executeUpdate()
            saveMediaList()
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        }
    }

    private fun executeUpdate() {
        service.executeUpdate()
    }

    fun saveMediaMeta() {
        val media = medialibrary.findMedia(getCurrentMedia())
        if (media === null || media.id == 0L) return
        val canSwitchToVideo = player.canSwitchToVideo()
        if (media.type == MediaWrapper.TYPE_VIDEO || canSwitchToVideo || media.isPodcast) {
            //Save progress
            val time = player.getTime()
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            val length = player.length
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            var progress = time / length.toFloat()
            if (progress > 0.95f || length - time < 10000) {
                //increase seen counter if more than 95% of the media have been seen
                //and reset progress to 0
                media.setLongMeta(MediaWrapper.META_SEEN, ++media.seen)
                progress = 0f
            }
            media.time = if (progress == 0f) 0L else time
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            media.setLongMeta(MediaWrapper.META_PROGRESS, media.time)
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        }
        if (canSwitchToVideo) {
            //Save audio delay
            if (settings.getBoolean("save_individual_audio_delay", false))
                media.setLongMeta(MediaWrapper.META_AUDIODELAY, player.getAudioDelay())
            media.setLongMeta(MediaWrapper.META_SUBTITLE_DELAY, player.getSpuDelay())
            media.setLongMeta(MediaWrapper.META_SUBTITLE_TRACK, player.getSpuTrack().toLong())
        }
    }

    private fun loadMediaMeta(media: MediaWrapper) {
        if (media.id == 0L) return
        if (player.canSwitchToVideo()) {
            if (settings.getBoolean("save_individual_audio_delay", false))
                player.setAudioDelay(media.getMetaLong(MediaWrapper.META_AUDIODELAY))
            player.setSpuTrack(media.getMetaLong(MediaWrapper.META_SUBTITLE_TRACK).toInt())
            player.setSpuDelay(media.getMetaLong(MediaWrapper.META_SUBTITLE_DELAY))
        }
    }

    @Synchronized
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    private fun saveCurrentMedia() {
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        settings.edit()
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                .putString(if (isAudioList()) "current_song" else "current_media", mediaList.getMRL(Math.max(currentIndex, 0)))
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                .apply()
    }

    @Synchronized
    private fun saveMediaList() {
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        if (getCurrentMedia() === null) return
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        val locations = StringBuilder()
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        for (mw in mediaList.all) locations.append(" ").append(Uri.encode(Uri.decode(mw.uri.toString())))
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        //We save a concatenated String because putStringSet is APIv11.
        settings.edit()
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                .putString(if (!isAudioList()) "media_list" else "audio_list", locations.toString().trim { it <= ' ' })
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                .apply()
    }

    override fun onItemMoved(indexBefore: Int, indexAfter: Int, mrl: String?) {
        if (BuildConfig.DEBUG) Log.i(TAG, "CustomMediaListItemMoved")
        if (currentIndex == indexBefore) {
            currentIndex = indexAfter
            if (indexAfter > indexBefore)
                --currentIndex
        } else if (currentIndex in indexAfter..(indexBefore - 1))
            ++currentIndex
        else if (currentIndex in (indexBefore + 1)..(indexAfter - 1))
            --currentIndex

        // If we are in random mode, we completely reset the stored previous track
        // as their indices changed.
        previous.clear()
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        launch(UI, CoroutineStart.UNDISPATCHED) {
            determinePrevAndNextIndices()
            executeUpdate()
            saveMediaList()
        }
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    }

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    private suspend fun determinePrevAndNextIndices(expand: Boolean = false) {
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        val media = getCurrentMedia()
        if (expand && media !== null) {
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            expanding = true
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            nextIndex = expand(media.type == MediaWrapper.TYPE_STREAM)
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            expanding = false
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        } else {
            nextIndex = -1
        }
        prevIndex = -1

        if (nextIndex == -1) {
            // No subitems; play the next item.
            val size = mediaList.size()
            shuffling = shuffling and (size > 2)

            // Repeating once doesn't change the index
            if (repeating == Constants.REPEAT_ONE) {
                nextIndex = currentIndex
                prevIndex = nextIndex
            } else {
                if (shuffling) {
                    if (!previous.isEmpty()) {
                        prevIndex = previous.peek()
                        while (!isValidPosition(prevIndex)) {
                            previous.removeAt(previous.size - 1)
                            if (previous.isEmpty()) {
                                prevIndex = -1
                                break
                            }
                            prevIndex = previous.peek()
                        }
                    }
                    // If we've played all songs already in shuffle, then either
                    // reshuffle or stop (depending on RepeatType).
                    if (previous.size + 1 == size) {
                        if (repeating == Constants.REPEAT_NONE) {
                            nextIndex = -1
                            return
                        } else {
                            previous.clear()
                            random = Random(System.currentTimeMillis())
                        }
                    }
                    random = Random(System.currentTimeMillis())
                    // Find a new index not in previous.
                    do {
                        nextIndex = random.nextInt(size)
                    } while (nextIndex == currentIndex || previous.contains(nextIndex))

                } else {
                    // normal playback
                    if (currentIndex > 0)
                        prevIndex = currentIndex - 1
                    nextIndex = when {
                        currentIndex + 1 < size -> currentIndex + 1
                        repeating == Constants.REPEAT_NONE -> -1
                        else -> 0
                    }
                }
            }
        }
    }

    /**
     * Expand the current media.
     * @return the index of the media was expanded, and -1 if no media was expanded
     */
    @MainThread
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    private suspend fun expand(updateHistory: Boolean): Int {
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        val index = currentIndex
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        val ml = player.expand()
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        var ret = -1

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        if (ml != null && ml.count > 0) {
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            val mrl = if (updateHistory) getCurrentMedia()?.location else null
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            mediaList.remove(index)
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            for (i in ml.count - 1 downTo 0) {
                val child = ml.getMediaAt(i)
                child.parse()
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                mediaList.insert(index, MediaWrapper(child))
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                child.release()
            }
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            if (mrl !== null && ml.count == 1) medialibrary.addToHistory(mrl, getCurrentMedia()!!.title)
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            ret = index
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        }
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        ml?.release()
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        return ret
    }

    fun getCurrentMedia() = mediaList.getMedia(currentIndex)

    fun getPrevMedia() = if (isValidPosition(prevIndex)) mediaList.getMedia(prevIndex) else null

    fun getNextMedia() = if (isValidPosition(nextIndex)) mediaList.getMedia(nextIndex) else null

    fun getMedia(position: Int) = mediaList.getMedia(position)

    private fun seekToResume(media: MediaWrapper) {
        var mw = media
        if (savedTime > 0L) {
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            if (savedTime < 0.95 * player.length) player.seek(savedTime)
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            savedTime = 0L
        } else {
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            val length = player.length
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            if (mw.length <= 0L && length > 0L) {
                mw = medialibrary.findMedia(mw)
                if (mw.id != 0L) {
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                    mw.time = mw.getMetaLong(MediaWrapper.META_PROGRESS)
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                    if (mw.time > 0L) player.seek(mw.time)
                }
            }
        }
    }

    @Synchronized
    private fun savePosition(reset: Boolean = false) {
        if (!hasMedia()) return
        val editor = settings.edit()
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        val audio = isAudioList()
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        editor.putBoolean(if (audio) "audio_shuffling" else "media_shuffling", shuffling)
        editor.putInt(if (audio) "audio_repeating" else "media_repeating", repeating)
        editor.putInt(if (audio) "position_in_audio_list" else "position_in_media_list", if (reset) 0 else currentIndex)
        editor.putLong(if (audio) "position_in_song" else "position_in_media", if (reset) 0L else player.getTime())
        if (!audio) {
            editor.putBoolean(PreferencesActivity.VIDEO_PAUSED, !player.isPlaying())
            editor.putFloat(PreferencesActivity.VIDEO_SPEED, player.getRate())
        }
        editor.apply()
    }

    /**
     * Append to the current existing playlist
     */
    fun append(list: List<MediaWrapper>) {
        if (!hasCurrentMedia()) {
            load(list, 0)
            return
        }
        for (media in list) mediaList.add(media)
    }

    /**
     * Insert into the current existing playlist
     */

    fun insertNext(list: List<MediaWrapper>) {
        if (!hasCurrentMedia()) {
            load(list, 0)
            return
        }

        val startIndex = currentIndex + 1

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        for ((index, mw) in list.withIndex()) mediaList.insert(startIndex + index, mw)
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    }

    /**
     * Move an item inside the playlist.
     */
    fun moveItem(positionStart: Int, positionEnd: Int) {
        mediaList.move(positionStart, positionEnd)
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }

    fun insertItem(position: Int, mw: MediaWrapper) {
        mediaList.insert(position, mw)
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }


    fun remove(position: Int) {
        mediaList.remove(position)
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }

    fun removeLocation(location: String) {
        mediaList.remove(location)
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        launch(UI, CoroutineStart.UNDISPATCHED) { determinePrevAndNextIndices() }
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    }

    fun getMediaListSize()= mediaList.size()

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    fun getMediaList(): MutableList<MediaWrapper> = mediaList.all
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    override fun onEvent(event: Media.Event) {
        var update = true
        when (event.type) {
            Media.Event.MetaChanged -> {
                /* Update Meta if file is already parsed */
                if (parsed && player.updateCurrentMeta(event.metaId, getCurrentMedia())) service.executeUpdate()
                if (BuildConfig.DEBUG) Log.i(MediaDatabase.TAG, "Media.Event.MetaChanged: " + event.metaId)
            }
            Media.Event.ParsedChanged -> {
                if (BuildConfig.DEBUG) Log.i(MediaDatabase.TAG, "Media.Event.ParsedChanged")
                player.updateCurrentMeta(-1, getCurrentMedia())
                parsed = true
            }
            else -> update = false
        }
        if (update) {
            service.onMediaEvent(event)
            if (parsed) service.showNotification()
        }
    }

    private val mediaplayerEventListener = MediaPlayer.EventListener { event ->
        when (event.type) {
            MediaPlayer.Event.Playing -> {
                medialibrary.pauseBackgroundOperations()
                videoBackground = false
                val mw = medialibrary.findMedia(getCurrentMedia())
                if (newMedia) {
                    seekToResume(mw)
                    loadMediaMeta(mw)
                    if (mw.type == MediaWrapper.TYPE_STREAM) medialibrary.addToHistory(mw.location, mw.title)
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                    saveMediaList()
                    savePosition(true)
                    saveCurrentMedia()
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                    newMedia = false
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                }
            }
            MediaPlayer.Event.Paused -> medialibrary.resumeBackgroundOperations()
            MediaPlayer.Event.EndReached -> {
                saveMediaMeta()
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                if (isBenchmark) player.setPreviousStats()
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                launch(UI, CoroutineStart.UNDISPATCHED) {
                    determinePrevAndNextIndices(true)
                    if (nextIndex == -1) savePosition(true)
                    next()
                }
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            }
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            MediaPlayer.Event.EncounteredError -> {
                service.showToast(service.getString(
                            R.string.invalid_location,
                            getCurrentMedia()?.getLocation() ?: ""), Toast.LENGTH_SHORT)
                next()
            }
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        }
        service.onMediaPlayerEvent(event)
    }
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    fun isAudioList() = !player.canSwitchToVideo() && mediaList.isAudioList
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}