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provide functions for both linear and ramped tempo-twists

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This commit is contained in:
Ben Loftis 2023-05-04 07:33:44 -05:00
parent 1b6e4b0b84
commit 912f9e5ea3
2 changed files with 46 additions and 2 deletions
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44
libs/temporal/tempo.cc
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@ -3631,7 +3631,49 @@ TempoMap::iteratively_solve_ramp (TempoPoint& earlier, TempoPoint& later)
}
void
TempoMap::twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_value)
TempoMap::linear_twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_value)
{
/* Check if the new tempo value is within an acceptable range */
if (tempo_value < 4.0 || tempo_value > 400) {
return;
}
TempoPoint old_prev (prev);
TempoPoint old_focus (focus);
/* Our job here is to reposition @param focus without altering the
* positions of @param prev and @param next. We do this by changing
* the tempo of prev (as opposed to ramped_twist_tempi, below )
*/
/* set a fixed tempo for the previous marker (this results in 'focus' moving a bit with the mouse) */
prev.set_note_types_per_minute (tempo_value);
prev.set_end_npm (tempo_value);
/* reposition focus, using prev to define audio time; leave beat time
* and BBT alone
*/
focus.set (prev.superclock_at (focus.beats()), focus.beats(), focus.bbt());
/* Now iteratively adjust focus.superclocks_per_quarter_note() (the
* section's starting tempo) so that next.sclock() remains within 1
* sample of its current position
*/
std::cerr << "pre-iter\n";
dump (std::cerr);
if (!iteratively_solve_ramp (focus, next)) {
prev = old_prev;
focus = old_focus;
return;
}
}
void
TempoMap::ramped_twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_value)
{
/* Check if the new tempo value is within an acceptable range */

4
libs/temporal/temporal/tempo.h
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@ -766,7 +766,9 @@ class /*LIBTEMPORAL_API*/ TempoMap : public PBD::StatefulDestructible
LIBTEMPORAL_API int set_state (XMLNode const&, int version);
LIBTEMPORAL_API void twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_delta);
LIBTEMPORAL_API void linear_twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_delta);
LIBTEMPORAL_API void ramped_twist_tempi (TempoPoint& prev, TempoPoint& focus, TempoPoint& next, double tempo_delta);
LIBTEMPORAL_API void stretch_tempo (TempoPoint& ts, double new_npm);
LIBTEMPORAL_API void stretch_tempo_end (TempoPoint* ts, samplepos_t sample, samplepos_t end_sample);