- 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;
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- const Tempo tempo_at_frame_locked (const Metrics& metrics, const framepos_t& frame) const;
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- const TempoSection& tempo_section_at_locked (const Metrics& metrics, framepos_t frame) const;