ExoPlayer notes

ExoPlayer notes

/**
 * 播放raw下的本地文件
 */
fun initPlayer(context: Context, rawRes: Int): SimpleExoPlayer {
    val dataSpec = DataSpec(RawResourceDataSource.buildRawResourceUri(rawRes))
    val dataSource = RawResourceDataSource(context)
    dataSource.open(dataSpec)

    val bandwidthMeter = DefaultBandwidthMeter()
    val extractorsFactory = DefaultExtractorsFactory()
    val trackSelectionFactory = AdaptiveTrackSelection.Factory(bandwidthMeter)
    val trackSelector = DefaultTrackSelector(trackSelectionFactory)
    val defaultBandwidthMeter = DefaultBandwidthMeter()
    val dataSourceFactory = DefaultDataSourceFactory(context,
            Util.getUserAgent(context, context.getString(R.string.app_name)), defaultBandwidthMeter)
    val mediaSource = ExtractorMediaSource(dataSource.uri, dataSourceFactory, extractorsFactory, null, null)
    val player = ExoPlayerFactory.newSimpleInstance(context, trackSelector)
    player.prepare(mediaSource as MediaSource?)
    return player
}

/**
 * 播放local文件
 */
fun initPlayer(context: Context, uri: Uri): SimpleExoPlayer {
    val dataSpec = DataSpec(uri)
    val fileDataSource = FileDataSource()
    fileDataSource.open(dataSpec)
    val bandwidthMeter = DefaultBandwidthMeter()
    val extractorsFactory = DefaultExtractorsFactory()
    val trackSelectionFactory = AdaptiveTrackSelection.Factory(bandwidthMeter)
    val trackSelector = DefaultTrackSelector(trackSelectionFactory)
    val defaultBandwidthMeter = DefaultBandwidthMeter()
    val dataSourceFactory = DefaultDataSourceFactory(context,
            Util.getUserAgent(context, context.getString(R.string.app_name)), defaultBandwidthMeter)
    val mediaSource = ExtractorMediaSource(fileDataSource.uri, dataSourceFactory, extractorsFactory, null, null)
    val player = ExoPlayerFactory.newSimpleInstance(context, trackSelector)
    player.prepare(mediaSource as MediaSource?)
    return player
}

/**
 * 在线播放音频
 */
fun initPlayer(context: Context, url: String?): SimpleExoPlayer? {
    LogUtil.e("initPlayer url:$url")
    if (url.isNullOrEmpty()) return null
    val bandwidthMeter = DefaultBandwidthMeter()
    val extractorsFactory = DefaultExtractorsFactory()
    val trackSelectionFactory = AdaptiveTrackSelection.Factory(bandwidthMeter)
    val trackSelector = DefaultTrackSelector(trackSelectionFactory)
//            val defaultBandwidthMeter = DefaultBandwidthMeter()
//            val dataSourceFactory = DefaultDataSourceFactory(context,
//                    Util.getUserAgent(context, context.getString(R.string.app_name)), defaultBandwidthMeter)
    //301重定向问题
    val defaultHttpDataSourceFactory = DefaultHttpDataSourceFactory(Util.getUserAgent(context, context.getString(R.string.app_name)), null, DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS,
            DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, true)
    val mediaSource = ExtractorMediaSource(Uri.parse(url), defaultHttpDataSourceFactory, extractorsFactory, null, null)
    val player = ExoPlayerFactory.newSimpleInstance(context, trackSelector)
    /*player.setAudioAttributes(AudioAttributes.Builder()
            .setUsage(C.USAGE_MEDIA)
            .setContentType(C.CONTENT_TYPE_MUSIC)
            .build(),true)*/
    player.prepare(mediaSource)
    when (player.playbackState) {
        Player.STATE_ENDED -> {
            player.release()
        }
    }
    return player
}


/**
 * 循环播放 mp3 ClippingMediaSource切割不精准 
 */
fun loopPlayer(url: String?, startPositionUs: Long, endPositionUs: Long, listener: Player.EventListener): SimpleExoPlayer? {
    LogUtil.e("ListenFragment url:$url startPositionUs:$startPositionUs endPositionUs:$endPositionUs")
    exoPlayer?.playWhenReady = false
    if (url.isNullOrEmpty()) return null
    val defaultHttpDataSourceFactory = DefaultDataSourceFactory(context,
            Util.getUserAgent(context, context.getString(R.string.app_name)))
    val progressiveMediaSource = ExtractorMediaSource.Factory(defaultHttpDataSourceFactory)
            .createMediaSource(Uri.parse(url))
    val clippingMediaSource = ClippingMediaSource(progressiveMediaSource, startPositionUs * 1000, endPositionUs * 1000)
    val loopingMediaSource = LoopingMediaSource(clippingMediaSource)
    exoPlayer = ExoPlayerFactory.newSimpleInstance(context)
    exoPlayer?.prepare(loopingMediaSource)
    exoPlayer?.addListener(listener)
    return exoPlayer
}

thanks:
https://github.com/google/ExoPlayer/issues/4626
https://github.com/google/ExoPlayer/issues/4676
https://stackoverflow.com/questions/54689722/how-to-skip-few-part-of-the-video-in-exoplayer-android
https://github.com/google/ExoPlayer/issues/5501
https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/source/ClippingMediaSource.html
https://nicedoc.io/google/ExoPlayer/blob/release-v2/RELEASENOTES.md