Exact beat - provide audio->music mapping for region split.

	- for those not in the know, this series provides a way to
	  remove the temporal distortion introduced when using an
	  audio frame-based gui for music-locked objects.

	  In short, the gui uses an audio frame representation to move
	  objects. It displays the object using frame_at_beat(), quantizing
	  the time value to audio frames. This is fine until the user selects
	  that frame but expects it to be interpreted as a beat.
	  Thus beat_at_frame() would not produce the user-expected beat
	  (temporal quantization error of up to 0.5 audio samples).
	  This is one method of mapping audio time to music time accurately.

1 files changed, 4 insertions, 4 deletions

diff --git a/libs/ardour/ardour/midi_region.h b/libs/ardour/ardour/midi_region.h
index 3a097c907e..9de79a9513 100644
--- a/libs/ardour/ardour/midi_region.h
+++ b/libs/ardour/ardour/midi_region.h
@@ -115,7 +115,7 @@ class LIBARDOUR_API MidiRegion : public Region
 
 	MidiRegion (const SourceList&);
 	MidiRegion (boost::shared_ptr<const MidiRegion>);
-	MidiRegion (boost::shared_ptr<const MidiRegion>, frameoffset_t offset);
+	MidiRegion (boost::shared_ptr<const MidiRegion>, frameoffset_t offset, const int32_t& sub_num = 0);
 
 	framecnt_t _read_at (const SourceList&, Evoral::EventSink<framepos_t>& dst,
 	                     framepos_t position,
@@ -131,11 +131,11 @@ class LIBARDOUR_API MidiRegion : public Region
 	void recompute_at_start ();
 	void recompute_at_end ();
 
-	void set_position_internal (framepos_t pos, bool allow_bbt_recompute);
-	void set_length_internal (framecnt_t len);
+	void set_position_internal (framepos_t pos, bool allow_bbt_recompute, const int32_t& sub_num);
+	void set_length_internal (framecnt_t len, const int32_t& sub_num);
 	void set_start_internal (framecnt_t, const int32_t& sub_num);
 	void trim_to_internal (framepos_t position, framecnt_t length, const int32_t& sub_num);
-	void update_length_beats ();
+	void update_length_beats (const int32_t& sub_num);
 
 	void model_changed ();
 	void model_automation_state_changed (Evoral::Parameter const &);