void select_all(int type,
int value);
void translate_projector(float offset_x, float offset_y);
- int total_of(int type);
+ int total_of(int type);
+ Track* get_track_by_id(int id);
// add a track
Track* add_audio_track(int above, Track *dst_track);
Track* add_video_track(int above, Track *dst_track);