create-ep-instance.kt

enum class SourceType {
    local_audio, local_video, http_audio, http_video, playlist;
}

data class PlayerState(var window: Int = 0,
                       var position: Long = 0,
                       var whenReady: Boolean = true,
                       var source: SourceType = local_audio)
                       
class PlayerHolder(val context: Context,
                   val playerView: PlayerView,
                   val playerState: PlayerState) : AnkoLogger {
    val player: ExoPlayer
                   
    init {
        // Create the player instance.
        player = ExoPlayerFactory.newSimpleInstance(ctx, DefaultTrackSelector())
                .also {
                    playerView.player = it // Bind to the view.
                    info { "SimpleExoPlayer created" }
                }    
    }

    fun start() {
            // Load media.
            prepare(buildMediaSource(selectMediaToPlay(state.source)))
            // Start playback when media has buffered enough.
            playWhenReady = true
    }

    fun selectMediaToPlay(source: Source): Uri {
        return when (source) {
            Source.local_audio -> Uri.parse("asset:///audio/file.mp3")
            Source.local_video -> Uri.parse("asset:///video/file.mp4")
            Source.http_audio -> Uri.parse("http://site.../file.mp3")
            Source.http_video -> Uri.parse("http://site.../file.mp4")
        }
    }

    private fun buildMediaSource(uri: Uri): ExtractorMediaSource {
        return ExtractorMediaSource.Factory(
                DefaultDataSourceFactory(ctx, "videoapp")).createMediaSource(uri)
    }

    fun stop() { ... }
    
    fun release() { ... }
}