@Override
 public void insertIntoPlaylist(int index, String... mediaURLs) {
   if (engine instanceof PlaylistSupport) {
     ((PlaylistSupport) engine).insertIntoPlaylist(index, mediaURLs);
   }
 }
 @Override
 public void insertIntoPlaylist(int index, MRL mediaLocator) {
   if (engine instanceof PlaylistSupport) {
     ((PlaylistSupport) engine).insertIntoPlaylist(index, mediaLocator);
   }
 }