ep-playlist.kt

val mediaMap = mapOf<SourceType, Uri>(
        local_audio to Uri.parse("asset:///audio/file.mp3"),
        local_video to Uri.parse("asset:///video/file.mp4"),
        http_audio to Uri.parse("http://site...file.mp3"),
        http_video to Uri.parse("http://site...file.mp4")
    )


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

fun buildMediaSource(sourceType: SourceType): MediaSource {
        return when (sourceType) {
            playlist -> {
                return DynamicConcatenatingMediaSource(
                        createExtractorMediaSource(local_audio),
                        createExtractorMediaSource(local_video),
                        createExtractorMediaSource(http_audio),
                        createExtractorMediaSource(http_video)
                )
            }
            else -> { return createExtractorMediaSource(sourceType) }
        }
    }

    private fun createExtractorMediaSource(sourceType: SourceType): MediaSource {
        return ExtractorMediaSource.Factory(
                DefaultDataSourceFactory(mContext, "exoplayer-learning"))
                .createMediaSource(mediaMap.get(sourceType))
    }