open method
Implementation
@override
Future<void> open(AudioSource dataSource)async {
if(dataSource is AudioDataSource){
Media media = _coverAudioDataSourceToMedial(dataSource);
_player.open(media);
}
else if(dataSource is AudioPlaylist){
_player.open(Playlist(medias: dataSource.playList.map(_coverAudioDataSourceToMedial).toList()));
}
}