nframes_t skip_frames = 0) const;
bool verify_start (nframes_t position);
- bool verify_length (nframes_t position);
+ bool verify_length (nframes_t& length);
bool verify_start_mutable (nframes_t& start);
- bool verify_start_and_length (nframes_t start, nframes_t length);
+ bool verify_start_and_length (nframes_t start, nframes_t& length);
void recompute_at_start ();
void recompute_at_end ();