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Allow negative return in TempoMap::beat_at_frame() and its exact_ variant.

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- audio-locked midi regions can be start-trimmed properly
	  when close to 1|1|0
	- a midi region placed before the first meter
	  will continue the tempo curve and first meter.

Only a couple of callers require change, as bbt_at_beat() already
deals with this.
This commit is contained in:
nick_m 2016-08-13 02:23:07 +10:00
parent 23d1d1f55b
commit 5c2ccc4f3e
4 changed files with 28 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

4
gtk2_ardour/editor_rulers.cc
View file

@ -1017,14 +1017,14 @@ Editor::compute_bbt_ruler_scale (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
std::vector<TempoMap::BBTPoint>::const_iterator i;
Timecode::BBT_Time lower_beat, upper_beat; // the beats at each end of the ruler
double floor_lower_beat = floor(_session->tempo_map().beat_at_frame (lower));
double floor_lower_beat = floor(max (0.0, _session->tempo_map().beat_at_frame (lower)));
if (floor_lower_beat < 0.0) {
floor_lower_beat = 0.0;
}
const framecnt_t beat_before_lower_pos = _session->tempo_map().frame_at_beat (floor_lower_beat);
const framecnt_t beat_after_upper_pos = _session->tempo_map().frame_at_beat (floor (_session->tempo_map().beat_at_frame (upper)) + 1.0);
const framecnt_t beat_after_upper_pos = _session->tempo_map().frame_at_beat (floor (max (0.0, _session->tempo_map().beat_at_frame (upper))) + 1.0);
_session->bbt_time (beat_before_lower_pos, lower_beat);
_session->bbt_time (beat_after_upper_pos, upper_beat);

2
gtk2_ardour/editor_tempodisplay.cc
View file

@ -279,7 +279,7 @@ Editor::compute_current_bbt_points (std::vector<TempoMap::BBTPoint>& grid, frame
/* prevent negative values of leftmost from creeping into tempomap
*/
const double lower_beat = floor (_session->tempo_map().beat_at_frame (leftmost)) - 1.0;
const double lower_beat = floor (max (0.0, _session->tempo_map().beat_at_frame (leftmost))) - 1.0;
_session->tempo_map().get_grid (grid, max (_session->tempo_map().frame_at_beat (lower_beat), (framepos_t) 0), rightmost);
}

2
gtk2_ardour/step_editor.cc
View file

@ -117,7 +117,7 @@ StepEditor::prepare_step_edit_region ()
const Meter& m = _mtv.session()->tempo_map().meter_at_frame (step_edit_insert_position);
double baf = _mtv.session()->tempo_map().beat_at_frame (step_edit_insert_position);
double baf = max (0.0, _mtv.session()->tempo_map().beat_at_frame (step_edit_insert_position));
double next_bar_in_beats = baf + m.divisions_per_bar();
framecnt_t next_bar_pos = _mtv.session()->tempo_map().frame_at_beat (next_bar_in_beats);
framecnt_t len = next_bar_pos - step_edit_insert_position;

53
libs/ardour/tempo.cc
View file

@ -1454,6 +1454,14 @@ TempoMap::metric_at (BBT_Time bbt) const
return m;
}
/** Returns the beat duration corresponding to the supplied frame, possibly returning a negative value.
* @param frame The session frame position.
* @return The beat duration according to the tempo map at the supplied frame.
* If the supplied frame lies before the first meter, the returned beat duration will be negative.
* The returned beat is obtained using the first meter and the continuation of the tempo curve (backwards).
*
* This function uses both tempo and meter.
*/
double
TempoMap::beat_at_frame (const framecnt_t& frame) const
{
@ -1461,7 +1469,7 @@ TempoMap::beat_at_frame (const framecnt_t& frame) const
return beat_at_frame_locked (_metrics, frame);
}
/* meter / tempo section based */
/* This function uses both tempo and meter.*/
double
TempoMap::beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame) const
{
@ -1478,9 +1486,7 @@ TempoMap::beat_at_frame_locked (const Metrics& metrics, const framecnt_t& frame)
prev_m = static_cast<MeterSection*> (*i);
}
}
if (frame < prev_m->frame()) {
return 0.0;
}
const double beat = prev_m->beat() + (ts.pulse_at_frame (frame, _frame_rate) - prev_m->pulse()) * prev_m->note_divisor();
/* audio locked meters fake their beat */
@ -2977,6 +2983,15 @@ TempoMap::gui_dilate_tempo (TempoSection* ts, const framepos_t& frame, const fra
MetricPositionChanged (); // Emit Signal
}
/** Returns the exact beat subdivision closest to the supplied frame, possibly returning a negative value.
* @param frame The session frame position.
* @param sub_num The requested beat subdivision to use when rounding the frame position.
* @return The beat position of the supplied frame.
* If the supplied frame lies before the first meter, the return will be negative.
* The returned beat is obtained using the first meter and the continuation of the tempo curve (backwards).
*
* This function uses both tempo and meter.
*/
double
TempoMap::exact_beat_at_frame (const framepos_t& frame, const int32_t sub_num)
{
@ -2989,6 +3004,7 @@ double
TempoMap::exact_beat_at_frame_locked (const Metrics& metrics, const framepos_t& frame, const int32_t sub_num)
{
double beat = beat_at_frame_locked (metrics, frame);
if (sub_num > 1) {
beat = floor (beat) + (floor (((beat - floor (beat)) * (double) sub_num) + 0.5) / sub_num);
} else if (sub_num == 1) {
@ -3009,7 +3025,7 @@ TempoMap::bbt_duration_at (framepos_t pos, const BBT_Time& bbt, int dir)
{
Glib::Threads::RWLock::ReaderLock lm (lock);
const double tick_at_time = beat_at_frame_locked (_metrics, pos) * BBT_Time::ticks_per_beat;
const double tick_at_time = max (0.0, beat_at_frame_locked (_metrics, pos)) * BBT_Time::ticks_per_beat;
const double bbt_ticks = bbt.ticks + (bbt.beats * BBT_Time::ticks_per_beat);
const double total_beats = (tick_at_time + bbt_ticks) / BBT_Time::ticks_per_beat;
@ -3032,7 +3048,7 @@ framepos_t
TempoMap::round_to_beat_subdivision (framepos_t fr, int sub_num, RoundMode dir)
{
Glib::Threads::RWLock::ReaderLock lm (lock);
uint32_t ticks = (uint32_t) floor (beat_at_frame_locked (_metrics, fr) * BBT_Time::ticks_per_beat);
uint32_t ticks = (uint32_t) floor (max (0.0, beat_at_frame_locked (_metrics, fr)) * BBT_Time::ticks_per_beat);
uint32_t beats = (uint32_t) floor (ticks / BBT_Time::ticks_per_beat);
uint32_t ticks_one_subdivisions_worth = (uint32_t) BBT_Time::ticks_per_beat / sub_num;
@ -3715,7 +3731,7 @@ TempoMap::insert_time (framepos_t where, framecnt_t amount)
bbt.beats = 1;
}
}
pair<double, BBT_Time> start = make_pair (beat_at_frame_locked (_metrics, m->frame()), bbt);
pair<double, BBT_Time> start = make_pair (max (0.0, beat_at_frame_locked (_metrics, m->frame())), bbt);
m->set_beat (start);
m->set_pulse (pulse_at_frame_locked (_metrics, m->frame()));
meter = m;
@ -3803,28 +3819,7 @@ TempoMap::framepos_plus_beats (framepos_t frame, Evoral::Beats beats) const
{
Glib::Threads::RWLock::ReaderLock lm (lock);
const TempoSection& ts = tempo_section_at_frame_locked (_metrics, frame);
MeterSection* prev_m = 0;
MeterSection* next_m = 0;
for (Metrics::const_iterator i = _metrics.begin(); i != _metrics.end(); ++i) {
if (!(*i)->is_tempo()) {
if (prev_m && (*i)->frame() > frame) {
next_m = static_cast<MeterSection*> (*i);
break;
}
prev_m = static_cast<MeterSection*> (*i);
}
}
double pos_beat = prev_m->beat() + (ts.pulse_at_frame (frame, _frame_rate) - prev_m->pulse()) * prev_m->note_divisor();
/* audio locked meters fake their beat */
if (next_m && next_m->beat() < pos_beat) {
pos_beat = next_m->beat();
}
return frame_at_beat_locked (_metrics, pos_beat + beats.to_double());
return frame_at_beat_locked (_metrics, beat_at_frame_locked (_metrics, frame) + beats.to_double());
}
/** Subtract some (fractional) beats from a frame position, and return the result in frames */