- double beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const;
- framecnt_t frame_at_beat_locked (const Metrics& metrics, const double& beat) const;
+ Tempo tempo_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
+ framepos_t frame_at_tempo_locked (const Metrics& metrics, const Tempo& tempo) const;
+
+ Timecode::BBT_Time bbt_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
+ framepos_t frame_at_bbt_locked (const Metrics& metrics, const Timecode::BBT_Time&) const;