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Tempo ramps - improve constraint mod + bbt dragging begavior.

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nick_m 2016-05-10 05:25:53 +10:00
parent ccf6ce76d9
commit 8724a9f68f
3 changed files with 48 additions and 42 deletions
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66
libs/ardour/tempo.cc
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@ -2798,7 +2798,6 @@ TempoMap::gui_dilate_tempo (const framepos_t& frame, const framepos_t& end_frame
TempoSection* prev_t = copy_metrics_and_point (_metrics, future_map, ts);
TempoSection* prev_to_prev_t = 0;
const frameoffset_t fr_off = end_frame - frame;
double new_bpm = 0.0;
if (prev_t && prev_t->pulse() > 0.0) {
prev_to_prev_t = const_cast<TempoSection*>(&tempo_section_at_locked (future_map, prev_t->frame() - 1));
@ -2808,30 +2807,34 @@ TempoMap::gui_dilate_tempo (const framepos_t& frame, const framepos_t& end_frame
constant to constant is straightforward, as the tempo prev to prev_t has constant slope.
*/
double contribution = 0.0;
frameoffset_t frame_contribution = 0;
frameoffset_t prev_t_frame_contribution = fr_off;
if (prev_to_prev_t && prev_to_prev_t->type() == TempoSection::Ramp) {
/* prev to prev_t's position will remain constant in terms of frame and pulse. lets use frames. */
contribution = (prev_t->frame() - prev_to_prev_t->frame()) / (double) (frame - prev_to_prev_t->frame());
frame_contribution = contribution * (double) fr_off;
prev_t_frame_contribution -= frame_contribution;
contribution = prev_to_prev_t->beats_per_minute() / (prev_to_prev_t->beats_per_minute() + prev_t->beats_per_minute());
}
frameoffset_t frame_contribution = contribution * (double) fr_off;
frameoffset_t prev_t_frame_contribution = fr_off - frame_contribution;
const double start_tempo = prev_t->tempo_at_frame (frame, _frame_rate);
const double end_tempo = prev_t->tempo_at_frame (frame + prev_t_frame_contribution, _frame_rate);
const double start_pulse = prev_t->pulse_at_frame (frame, _frame_rate);
const double end_pulse = prev_t->pulse_at_frame (end_frame, _frame_rate);
const double dpulse = (start_pulse) / (end_pulse);
double new_bpm = prev_t->tempo_at_frame (prev_t->frame() - prev_t_frame_contribution, _frame_rate) * (double) prev_t->note_type();
if (prev_t->type() == TempoSection::Constant || prev_t->c_func() == 0.0) {
if (prev_t->position_lock_style() == MusicTime) {
if (prev_to_prev_t && prev_to_prev_t->type() == TempoSection::Ramp) {
new_bpm = prev_t->beats_per_minute() * ((frame - prev_t->frame())
/ (double) (frame + prev_t_frame_contribution - prev_t->frame()));
/ (double) ((frame + prev_t_frame_contribution) - prev_t->frame()));
} else {
/* prev to prev is irrelevant */
const double meter_pulse = prev_t->pulse_at_frame (frame, _frame_rate);
const double frame_pulse = prev_t->pulse_at_frame (end_frame, _frame_rate);
if (frame_pulse != prev_t->pulse()) {
new_bpm = prev_t->beats_per_minute() * ((meter_pulse - prev_t->pulse()) / (frame_pulse - prev_t->pulse()));
if (start_pulse != prev_t->pulse()) {
new_bpm = prev_t->beats_per_minute() * ((start_pulse - prev_t->pulse()) / (end_pulse - prev_t->pulse()));
} else {
new_bpm = prev_t->beats_per_minute();
}
@ -2840,7 +2843,7 @@ TempoMap::gui_dilate_tempo (const framepos_t& frame, const framepos_t& end_frame
/* AudioTime */
if (prev_to_prev_t && prev_to_prev_t->type() == TempoSection::Ramp) {
new_bpm = prev_t->beats_per_minute() * ((frame - prev_t->frame())
/ (double) (frame + prev_t_frame_contribution - prev_t->frame()));
/ (double) ((frame + prev_t_frame_contribution) - prev_t->frame()));
} else {
/* prev_to_prev_t is irrelevant */
@ -2852,38 +2855,33 @@ TempoMap::gui_dilate_tempo (const framepos_t& frame, const framepos_t& end_frame
}
}
} else if (prev_t->c_func() < 0.0) {
if (prev_to_prev_t && prev_to_prev_t->type() == TempoSection::Ramp) {
new_bpm = prev_t->tempo_at_frame (prev_t->frame() + frame_contribution, _frame_rate) * (double) prev_t->note_type();
} else {
/* prev_to_prev_t is irrelevant */
new_bpm = prev_t->tempo_at_frame (prev_t->frame() + fr_off, _frame_rate) * (double) prev_t->note_type();
}
const double end_minute = ((end_frame - prev_t->frame()) / (double) _frame_rate) / 60.0;
const double end_tempo = prev_t->tempo_at_frame (end_frame, _frame_rate);
const double end_minute = (((frame + prev_t_frame_contribution) - prev_t->frame()) / (double) _frame_rate) / 60.0;
const double future_c = log (end_tempo / (new_bpm / (double) prev_t->note_type())) / end_minute;
const double dtempo = (start_tempo) / (end_tempo);
const double dframe = (frame) / (double) ((frame + prev_t_frame_contribution));
/* limits - a bit clunky, but meh */
if (future_c > -20.1 && future_c < 20.1) {
new_bpm = prev_t->beats_per_minute() * ((frame - prev_t->frame())
/ (double) ((frame + prev_t_frame_contribution) - prev_t->frame()));
if (future_c > -10.1 && future_c < 10.1) {
new_bpm = prev_t->beats_per_minute() * (dpulse / dtempo);
} else {
new_bpm = prev_t->beats_per_minute() * (dframe / dtempo);
}
} else if (prev_t->c_func() > 0.0) {
if (prev_to_prev_t && prev_to_prev_t->type() == TempoSection::Ramp) {
new_bpm = prev_t->tempo_at_frame (prev_t->frame() - frame_contribution, _frame_rate) * (double) prev_t->note_type();
} else {
/* prev_to_prev_t is irrelevant */
new_bpm = prev_t->tempo_at_frame (prev_t->frame() - fr_off, _frame_rate) * (double) prev_t->note_type();
}
const double end_minute = ((end_frame - prev_t->frame()) / (double) _frame_rate) / 60.0;
const double end_tempo = prev_t->tempo_at_frame (end_frame, _frame_rate);
const double end_minute = (((frame + prev_t_frame_contribution) - prev_t->frame()) / (double) _frame_rate) / 60.0;
const double future_c = log (end_tempo / (new_bpm / (double) prev_t->note_type())) / end_minute;
const double dtempo = (end_tempo) / (start_tempo);
const double dframe = (frame) / (double) ((frame + prev_t_frame_contribution));
/* limits - a bit clunky, but meh */
if (future_c > -20.1 && future_c < 20.1) {
new_bpm = prev_t->beats_per_minute() * ((frame - prev_t->frame())
/ (double) ((frame + prev_t_frame_contribution) - prev_t->frame()));
if (future_c > -10.1 && future_c < 10.1) {
new_bpm = prev_t->beats_per_minute() * (dpulse / dtempo);
} else {
new_bpm = prev_t->beats_per_minute() * (dframe / dtempo);
}
}