Track *track() const { return _track.track(); }
unsigned entry() const { return _track.entry(); }
const TrackIter &track_iter() const { return _track; }
BlockIter block_iter() const;
float offset() const { return _offset; }
Track *track() const { return _track.track(); }
unsigned entry() const { return _track.entry(); }
const TrackIter &track_iter() const { return _track; }
BlockIter block_iter() const;
float offset() const { return _offset; }