case VLC_META_ENGINE_SEQ_NUM: i_mode = SORT_TRACK_NUMBER; break;
case VLC_META_ENGINE_DESCRIPTION:i_mode = SORT_DESCRIPTION; break;
case VLC_META_ENGINE_RATING: i_mode = SORT_RATING; break;
case VLC_META_ENGINE_SEQ_NUM: i_mode = SORT_TRACK_NUMBER; break;
case VLC_META_ENGINE_DESCRIPTION:i_mode = SORT_DESCRIPTION; break;
case VLC_META_ENGINE_RATING: i_mode = SORT_RATING; break;