*/
#include <algorithm>
+#include <stdexcept>
+
#include <unistd.h>
#include <cmath>
-#include <sigc++/bind.h>
#include <glibmm/thread.h>
#include "pbd/xml++.h"
}
};
-TempoMap::TempoMap (nframes_t fr)
+TempoMap::TempoMap (nframes64_t fr)
{
metrics = new Metrics;
_frame_rate = fr;
/* position by audio frame, then recompute BBT timestamps from the audio ones */
- nframes_t frame = frame_time (when);
+ nframes64_t frame = frame_time (when);
// cerr << "nominal frame time = " << frame << endl;
- nframes_t prev_frame = round_to_type (frame, -1, Beat);
- nframes_t next_frame = round_to_type (frame, 1, Beat);
+ nframes64_t prev_frame = round_to_type (frame, -1, Beat);
+ nframes64_t next_frame = round_to_type (frame, 1, Beat);
// cerr << "previous beat at " << prev_frame << " next at " << next_frame << endl;
TempoMap::move_tempo (TempoSection& tempo, const BBT_Time& when)
{
if (move_metric_section (tempo, when) == 0) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
TempoMap::move_meter (MeterSection& meter, const BBT_Time& when)
{
if (move_metric_section (meter, when) == 0) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
}
if (removed) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
}
if (removed) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
{
Metrics::iterator i;
+ /* Look for any existing MetricSection that is of the same type and
+ at the same time as the new one, and remove it before adding
+ the new one.
+ */
+
+ Metrics::iterator to_remove = metrics->end ();
+
for (i = metrics->begin(); i != metrics->end(); ++i) {
- if (with_bbt) {
- if ((*i)->start() < section->start()) {
- continue;
- }
- } else {
- if ((*i)->frame() < section->frame()) {
- continue;
- }
+ int const c = (*i)->compare (section, with_bbt);
+
+ if (c < 0) {
+ /* this section is before the one to be added; go back round */
+ continue;
+ } else if (c > 0) {
+ /* this section is after the one to be added; there can't be any at the same time */
+ break;
+ }
+
+ /* hacky comparison of type */
+ bool const a = dynamic_cast<TempoSection*> (*i) != 0;
+ bool const b = dynamic_cast<TempoSection*> (section) != 0;
+
+ if (a == b) {
+ to_remove = i;
+ break;
+ }
+ }
+
+ if (to_remove != metrics->end()) {
+ /* remove the MetricSection at the same time as the one we are about to add */
+ metrics->erase (to_remove);
+ }
+
+ /* Add the given MetricSection */
+
+ for (i = metrics->begin(); i != metrics->end(); ++i) {
+
+ if ((*i)->compare (section, with_bbt) < 0) {
+ continue;
}
metrics->insert (i, section);
Glib::RWLock::WriterLock lm (lock);
/* new tempos always start on a beat */
-
where.ticks = 0;
do_insert (new TempoSection (where, tempo.beats_per_minute(), tempo.note_type()), true);
}
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
void
-TempoMap::add_tempo (const Tempo& tempo, nframes_t where)
+TempoMap::add_tempo (const Tempo& tempo, nframes64_t where)
{
{
Glib::RWLock::WriterLock lm (lock);
do_insert (new TempoSection (where, tempo.beats_per_minute(), tempo.note_type()), false);
}
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
void
}
if (replaced) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
}
/* new meters *always* start on a beat. */
-
where.ticks = 0;
do_insert (new MeterSection (where, meter.beats_per_bar(), meter.note_divisor()), true);
}
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
void
-TempoMap::add_meter (const Meter& meter, nframes_t where)
+TempoMap::add_meter (const Meter& meter, nframes64_t where)
{
{
Glib::RWLock::WriterLock lm (lock);
do_insert (new MeterSection (where, meter.beats_per_bar(), meter.note_divisor()), false);
}
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
void
}
if (replaced) {
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
}
for (Metrics::iterator i = metrics->begin(); i != metrics->end(); ++i) {
if ((t = dynamic_cast<TempoSection*> (*i)) != 0) {
*((Tempo*) t) = newtempo;
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
break;
}
}
}
void
-TempoMap::change_existing_tempo_at (nframes_t where, double beats_per_minute, double note_type)
+TempoMap::change_existing_tempo_at (nframes64_t where, double beats_per_minute, double note_type)
{
Tempo newtempo (beats_per_minute, note_type);
/* reset */
*((Tempo*)prev) = newtempo;
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
const MeterSection&
// cerr << "\n\n\n ######################\nTIMESTAMP via BBT ##############\n" << endl;
- nframes_t current = 0;
- nframes_t section_frames;
+ nframes64_t current = 0;
+ nframes64_t section_frames;
BBT_Time start;
BBT_Time end;
}
TempoMetric
-TempoMap::metric_at (nframes_t frame) const
+TempoMap::metric_at (nframes64_t frame) const
{
TempoMetric m (first_meter(), first_tempo());
const Meter* meter;
}
void
-TempoMap::bbt_time (nframes_t frame, BBT_Time& bbt) const
+TempoMap::bbt_time (nframes64_t frame, BBT_Time& bbt) const
{
{
Glib::RWLock::ReaderLock lm (lock);
}
void
-TempoMap::bbt_time_unlocked (nframes_t frame, BBT_Time& bbt) const
+TempoMap::bbt_time_unlocked (nframes64_t frame, BBT_Time& bbt) const
{
bbt_time_with_metric (frame, bbt, metric_at (frame));
}
void
-TempoMap::bbt_time_with_metric (nframes_t frame, BBT_Time& bbt, const TempoMetric& metric) const
+TempoMap::bbt_time_with_metric (nframes64_t frame, BBT_Time& bbt, const TempoMetric& metric) const
{
- nframes_t frame_diff;
+ nframes64_t frame_diff;
// cerr << "---- BBT time for " << frame << " using metric @ " << metric.frame() << " BBT " << metric.start() << endl;
0.1/4, but I can't be bothered to test that.
*/
uint32_t ticks_on_last_beat = (uint32_t)floor(Meter::ticks_per_beat * beat_fraction);
- if(bbt.beats > (uint32_t)floor(beats_per_bar) &&
- bbt.ticks >= ticks_on_last_beat) {
- bbt.ticks -= ticks_on_last_beat;
- bbt.beats = 0;
- bbt.bars++;
+
+ if (bbt.beats > (uint32_t)floor(beats_per_bar) && bbt.ticks >= ticks_on_last_beat) {
+ bbt.ticks -= ticks_on_last_beat;
+ bbt.beats = 0;
+ bbt.bars++;
}
bbt.beats++; // correction for 1-based counting, see above for matching operation.
// cerr << "-----\t RETURN " << bbt << endl;
}
-nframes_t
+nframes64_t
TempoMap::count_frames_between ( const BBT_Time& start, const BBT_Time& end) const
{
/* for this to work with fractional measure types, start and end have to be "legal" BBT types,
that means that the beats and ticks should be inside a bar
*/
- nframes_t frames = 0;
- nframes_t start_frame = 0;
- nframes_t end_frame = 0;
+ nframes64_t frames = 0;
+ nframes64_t start_frame = 0;
+ nframes64_t end_frame = 0;
TempoMetric m = metric_at (start);
+ start.ticks/Meter::ticks_per_beat;
- start_frame = m.frame() + (nframes_t) rint( beat_offset * m.tempo().frames_per_beat(_frame_rate, m.meter()));
+ start_frame = m.frame() + (nframes64_t) rint( beat_offset * m.tempo().frames_per_beat(_frame_rate, m.meter()));
m = metric_at(end);
beat_offset = bar_offset * m.meter().beats_per_bar() - (m.start().beats -1) + (end.beats - 1)
+ end.ticks/Meter::ticks_per_beat;
- end_frame = m.frame() + (nframes_t) rint(beat_offset * m.tempo().frames_per_beat(_frame_rate, m.meter()));
+ end_frame = m.frame() + (nframes64_t) rint(beat_offset * m.tempo().frames_per_beat(_frame_rate, m.meter()));
frames = end_frame - start_frame;
}
-nframes_t
+nframes64_t
TempoMap::count_frames_between_metrics (const Meter& meter, const Tempo& tempo, const BBT_Time& start, const BBT_Time& end) const
{
/* this is used in timestamping the metrics by actually counting the beats */
- nframes_t frames = 0;
+ nframes64_t frames = 0;
uint32_t bar = start.bars;
double beat = (double) start.beats;
double beats_counted = 0;
// << " fpb was " << beat_frames
// << endl;
- frames = (nframes_t) floor (beats_counted * beat_frames);
+ frames = (nframes64_t) floor (beats_counted * beat_frames);
return frames;
}
-nframes_t
+nframes64_t
TempoMap::frame_time (const BBT_Time& bbt) const
{
BBT_Time start ; /* 1|1|0 */
return count_frames_between ( start, bbt);
}
-nframes_t
-TempoMap::bbt_duration_at (nframes_t pos, const BBT_Time& bbt, int dir) const
+nframes64_t
+TempoMap::bbt_duration_at (nframes64_t pos, const BBT_Time& bbt, int dir) const
{
- nframes_t frames = 0;
+ nframes64_t frames = 0;
BBT_Time when;
bbt_time(pos, when);
return frames;
}
-nframes_t
+nframes64_t
TempoMap::bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const
{
- nframes_t frames = 0;
+ nframes64_t frames = 0;
double beats_per_bar;
BBT_Time result;
-nframes_t
-TempoMap::round_to_bar (nframes_t fr, int dir)
+nframes64_t
+TempoMap::round_to_bar (nframes64_t fr, int dir)
{
{
Glib::RWLock::ReaderLock lm (lock);
}
-nframes_t
-TempoMap::round_to_beat (nframes_t fr, int dir)
+nframes64_t
+TempoMap::round_to_beat (nframes64_t fr, int dir)
{
{
Glib::RWLock::ReaderLock lm (lock);
}
}
-nframes_t
-TempoMap::round_to_beat_subdivision (nframes_t fr, int sub_num, int dir)
+nframes64_t
+TempoMap::round_to_beat_subdivision (nframes64_t fr, int sub_num, int dir)
{
-
BBT_Time the_beat;
uint32_t ticks_one_half_subdivisions_worth;
uint32_t ticks_one_subdivisions_worth;
difference = ticks_one_subdivisions_worth - mod;
}
- if (the_beat.ticks + difference >= (uint32_t)Meter::ticks_per_beat) {
- the_beat.beats++;
- the_beat.ticks += difference;
- the_beat.ticks -= (uint32_t)Meter::ticks_per_beat;
- } else {
- the_beat.ticks += difference;
- }
+ the_beat = bbt_add (the_beat, BBT_Time (0, 0, difference));
} else if (dir < 0) {
if (mod == 0) {
/* right on the subdivision, so the difference is just the subdivision ticks */
difference = ticks_one_subdivisions_worth;
- cerr << "On the sub, move by 1 sub = " << difference << endl;
} else {
/* not on subdivision, compute distance to previous subdivision, which
is just the modulus.
*/
difference = mod;
- cerr << "off the sub, move by 1 sub = " << difference << endl;
}
-
- cerr << "ticks = " << the_beat.ticks << endl;
-
- if (the_beat.ticks < difference) {
- cerr << "backup beats, set ticks to "
- << (uint32_t)Meter::ticks_per_beat - difference << endl;
- the_beat.beats--;
- the_beat.ticks = (uint32_t)Meter::ticks_per_beat - difference;
- } else {
- cerr << " reduce ticks\n";
- the_beat.ticks -= difference;
- }
+ try {
+ the_beat = bbt_subtract (the_beat, BBT_Time (0, 0, difference));
+ } catch (...) {
+ /* can't go backwards from wherever pos is, so just return it */
+ return fr;
+ }
+
} else {
/* round to nearest */
if (the_beat.ticks % ticks_one_subdivisions_worth > ticks_one_half_subdivisions_worth) {
difference = ticks_one_subdivisions_worth - (the_beat.ticks % ticks_one_subdivisions_worth);
- if (the_beat.ticks + difference >= (uint32_t)Meter::ticks_per_beat) {
- the_beat.beats++;
- the_beat.ticks += difference;
- the_beat.ticks -= (uint32_t)Meter::ticks_per_beat;
- } else {
- the_beat.ticks += difference;
- }
+ the_beat = bbt_add (the_beat, BBT_Time (0, 0, difference));
} else {
// difference = ticks_one_subdivisions_worth - (the_beat.ticks % ticks_one_subdivisions_worth);
the_beat.ticks -= the_beat.ticks % ticks_one_subdivisions_worth;
return frame_time (the_beat);
}
-nframes_t
-TempoMap::round_to_type (nframes_t frame, int dir, BBTPointType type)
+nframes64_t
+TempoMap::round_to_type (nframes64_t frame, int dir, BBTPointType type)
{
TempoMetric metric = metric_at (frame);
BBT_Time bbt;
BBT_Time start;
- bbt_time_with_metric (frame, bbt, metric);
+ BBT_Time one_bar (1,0,0);
+ BBT_Time one_beat (0,1,0);
+ bbt_time_with_metric (frame, bbt, metric);
switch (type) {
case Bar:
- DEBUG_TRACE(DEBUG::SnapBBT, string_compose ("round from %1 (%3) to bars in direction %2\n", frame, (dir < 0 ? "back" : "forward"), bbt));
+ DEBUG_TRACE(DEBUG::SnapBBT, string_compose ("round from %1 (%3) to bars in direction %2\n", frame, dir, bbt));
+
if (dir < 0) {
- if (bbt.bars > 1) {
- bbt.bars--;
+
+ /* find bar position preceding frame */
+
+ try {
+ bbt = bbt_subtract (bbt, one_bar);
}
+
+ catch (...) {
+ return frame;
+ }
+
+
} else if (dir > 0) {
- if (bbt.beats > 0) {
- bbt.bars++;
- } else if (metric.frame() < frame) {
- bbt.bars++;
+
+ /* find bar position following frame */
+
+ try {
+ bbt = bbt_add (bbt, one_bar, metric);
+ }
+ catch (...) {
+ return frame;
}
+
} else {
- if (bbt.beats > metric.meter().beats_per_bar()/2) {
+
+ /* "true" rounding */
+
+ float midbar_beats;
+ float midbar_ticks;
+
+ midbar_beats = metric.meter().beats_per_bar() / 2 + 1;
+ midbar_ticks = Meter::ticks_per_beat * fmod (midbar_beats, 1.0f);
+ midbar_beats = floor (midbar_beats);
+
+ BBT_Time midbar (bbt.bars, lrintf (midbar_beats), lrintf (midbar_ticks));
+
+ if (bbt < midbar) {
+ /* round down */
+ bbt.beats = 1;
+ bbt.ticks = 0;
+ } else {
+ /* round up */
bbt.bars++;
+ bbt.beats = 1;
+ bbt.ticks = 0;
}
}
+ /* force beats & ticks to their values at the start of a bar */
bbt.beats = 1;
bbt.ticks = 0;
break;
case Beat:
DEBUG_TRACE(DEBUG::SnapBBT, string_compose ("round from %1 (%3) to beat in direction %2\n", frame, (dir < 0 ? "back" : "forward"), bbt));
+
if (dir < 0) {
- if (bbt.beats > 1) {
- bbt.beats--;
- }
+
+ /* find beat position preceding frame */
+
+ try {
+ bbt = bbt_subtract (bbt, one_beat);
+ }
+
+ catch (...) {
+ return frame;
+ }
+
} else if (dir > 0) {
- if (bbt.ticks > 0) {
- bbt.beats++;
- } else if (metric.frame() < frame) {
- bbt.beats++;
+
+ /* find beat position following frame */
+
+ try {
+ bbt = bbt_add (bbt, one_beat, metric);
+ }
+ catch (...) {
+ return frame;
}
+
} else {
+
+ /* "true" rounding */
+
+ /* round to nearest beat */
if (bbt.ticks >= (Meter::ticks_per_beat/2)) {
- bbt.beats++;
+
+ try {
+ bbt = bbt_add (bbt, one_beat, metric);
+ }
+ catch (...) {
+ return frame;
+ }
}
}
- if (bbt.beats > ceil(metric.meter().beats_per_bar()) ) {
- bbt.beats = 1;
- bbt.bars++;
- }
+ /* force ticks to the value at the start of a beat */
bbt.ticks = 0;
break;
}
TempoMap::BBTPointList *
-TempoMap::get_points (nframes_t lower, nframes_t upper) const
+TempoMap::get_points (nframes64_t lower, nframes64_t upper) const
{
Metrics::const_iterator i;
double delta_bars;
double delta_beats;
double dummy;
- nframes_t limit;
+ nframes64_t limit;
meter = &first_meter ();
tempo = &first_tempo ();
if (beat == 1) {
if (current >= lower) {
// cerr << "Add Bar at " << bar << "|1" << " @ " << current << endl;
- points->push_back (BBTPoint (*meter, *tempo,(nframes_t)rint(current), Bar, bar, 1));
+ points->push_back (BBTPoint (*meter, *tempo,(nframes64_t)rint(current), Bar, bar, 1));
}
}
while (beat <= ceil( beats_per_bar) && beat_frame < limit) {
if (beat_frame >= lower) {
// cerr << "Add Beat at " << bar << '|' << beat << " @ " << beat_frame << endl;
- points->push_back (BBTPoint (*meter, *tempo, (nframes_t) rint(beat_frame), Beat, bar, beat));
+ points->push_back (BBTPoint (*meter, *tempo, (nframes64_t) rint(beat_frame), Beat, bar, beat));
}
beat_frame += beat_frames;
current+= beat_frames;
}
const TempoSection&
-TempoMap::tempo_section_at (nframes_t frame)
+TempoMap::tempo_section_at (nframes64_t frame)
{
Glib::RWLock::ReaderLock lm (lock);
Metrics::iterator i;
}
const Tempo&
-TempoMap::tempo_at (nframes_t frame) const
+TempoMap::tempo_at (nframes64_t frame) const
{
TempoMetric m (metric_at (frame));
return m.tempo();
const Meter&
-TempoMap::meter_at (nframes_t frame) const
+TempoMap::meter_at (nframes64_t frame) const
{
TempoMetric m (metric_at (frame));
return m.meter();
}
}
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
return 0;
}
}
void
-TempoMap::insert_time (nframes_t where, nframes_t amount)
+TempoMap::insert_time (nframes64_t where, nframes64_t amount)
{
for (Metrics::iterator i = metrics->begin(); i != metrics->end(); ++i) {
if ((*i)->frame() >= where) {
timestamp_metrics (false);
- StateChanged (Change (0));
+ PropertyChanged (PropertyChange ());
}
BBT_Time
-TempoMap::bbt_add (const BBT_Time& a, const BBT_Time& b, const TempoMetric& /*metric*/)
+TempoMap::bbt_add (const BBT_Time& start, const BBT_Time& other) const
{
- // FIXME: Obviously not correct!
- return BBT_Time(a.bars + b.bars, a.beats + b.beats, a.ticks + b.ticks);
+ TempoMetric metric = metric_at (start);
+ return bbt_add (start, other, metric);
}
+/**
+ * add the BBT interval @param increment to @param start and return the result
+ */
BBT_Time
-TempoMap::bbt_add (const BBT_Time& a, const BBT_Time& b)
+TempoMap::bbt_add (const BBT_Time& start, const BBT_Time& increment, const TempoMetric& /*metric*/) const
{
- // FIXME: Obviously not correct!
- return BBT_Time(a.bars + b.bars, a.beats + b.beats, a.ticks + b.ticks);
+ BBT_Time result = start;
+ BBT_Time op = increment; /* argument is const, but we need to modify it */
+ uint32_t ticks = result.ticks + op.ticks;
+
+ if (ticks >= Meter::ticks_per_beat) {
+ op.beats++;
+ result.ticks = ticks % (uint32_t) Meter::ticks_per_beat;
+ } else {
+ result.ticks += op.ticks;
+ }
+
+ /* now comes the complicated part. we have to add one beat a time,
+ checking for a new metric on every beat.
+ */
+
+ /* grab all meter sections */
+
+ list<const MeterSection*> meter_sections;
+
+ for (Metrics::const_iterator x = metrics->begin(); x != metrics->end(); ++x) {
+ const MeterSection* ms;
+ if ((ms = dynamic_cast<const MeterSection*>(*x)) != 0) {
+ meter_sections.push_back (ms);
+ }
+ }
+
+ assert (!meter_sections.empty());
+
+ list<const MeterSection*>::const_iterator next_meter;
+ const Meter* meter = 0;
+
+ /* go forwards through the meter sections till we get to the one
+ covering the current value of result. this positions i to point to
+ the next meter section too, or the end.
+ */
+
+ for (next_meter = meter_sections.begin(); next_meter != meter_sections.end(); ++next_meter) {
+
+ if (result < (*next_meter)->start()) {
+ /* this metric is past the result time. stop looking, we have what we need */
+ break;
+ }
+
+ if (result == (*next_meter)->start()) {
+ /* this meter section starts at result, push i beyond it so that it points
+ to the NEXT section, opwise we will get stuck later, and use this meter section.
+ */
+ meter = *next_meter;
+ ++next_meter;
+ break;
+ }
+
+ meter = *next_meter;
+ }
+
+ assert (meter != 0);
+
+ /* OK, now have the meter for the bar start we are on, and i is an iterator
+ that points to the metric after the one we are currently dealing with
+ (or to metrics->end(), of course)
+ */
+
+ while (op.beats) {
+
+ /* given the current meter, have we gone past the end of the bar ? */
+
+ if (result.beats >= meter->beats_per_bar()) {
+ /* move to next bar, first beat */
+ result.bars++;
+ result.beats = 1;
+ } else {
+ result.beats++;
+ }
+
+ /* one down ... */
+
+ op.beats--;
+
+ /* check if we need to use a new meter section: has adding beats to result taken us
+ to or after the start of the next meter section? in which case, use it.
+ */
+
+ if (next_meter != meter_sections.end() && (((*next_meter)->start () < result) || (result == (*next_meter)->start()))) {
+ meter = *next_meter;
+ ++next_meter;
+ }
+ }
+
+ /* finally, add bars */
+
+ result.bars += op.bars++;
+
+ return result;
}
+/**
+ * subtract the BBT interval @param decrement from @param start and return the result
+ */
BBT_Time
-TempoMap::bbt_subtract (const BBT_Time& a, const BBT_Time& b)
+TempoMap::bbt_subtract (const BBT_Time& start, const BBT_Time& decrement) const
{
- // FIXME: Obviously not correct!
- return BBT_Time(a.bars - b.bars, a.beats - b.beats, a.ticks - b.ticks);
+ BBT_Time result = start;
+ BBT_Time op = decrement; /* argument is const, but we need to modify it */
+
+ if (op.ticks > result.ticks) {
+ /* subtract an extra beat later; meanwhile set ticks to the right "carry" value */
+ op.beats++;
+ result.ticks = Meter::ticks_per_beat - (op.ticks - result.ticks);
+ } else {
+ result.ticks -= op.ticks;
+ }
+
+ /* now comes the complicated part. we have to subtract one beat a time,
+ checking for a new metric on every beat.
+ */
+
+ /* grab all meter sections */
+
+ list<const MeterSection*> meter_sections;
+
+ for (Metrics::const_iterator x = metrics->begin(); x != metrics->end(); ++x) {
+ const MeterSection* ms;
+ if ((ms = dynamic_cast<const MeterSection*>(*x)) != 0) {
+ meter_sections.push_back (ms);
+ }
+ }
+
+ assert (!meter_sections.empty());
+
+ /* go backwards through the meter sections till we get to the one
+ covering the current value of result. this positions i to point to
+ the next (previous) meter section too, or the end.
+ */
+
+ const MeterSection* meter = 0;
+ list<const MeterSection*>::reverse_iterator next_meter; // older versions of GCC don't
+ // support const_reverse_iterator::operator!=()
+
+ for (next_meter = meter_sections.rbegin(); next_meter != meter_sections.rend(); ++next_meter) {
+
+ /* when we find the first meter section that is before or at result, use it,
+ and set next_meter to the previous one
+ */
+
+ if ((*next_meter)->start() < result || (*next_meter)->start() == result) {
+ meter = *next_meter;
+ ++next_meter;
+ break;
+ }
+ }
+
+ assert (meter != 0);
+
+ /* OK, now have the meter for the bar start we are on, and i is an iterator
+ that points to the metric after the one we are currently dealing with
+ (or to metrics->end(), of course)
+ */
+
+ while (op.beats) {
+
+ /* have we reached the start of the bar? if so, move to the last beat of the previous
+ bar. opwise, just step back 1 beat.
+ */
+
+ if (result.beats == 1) {
+
+ /* move to previous bar, last beat */
+
+ if (result.bars <= 1) {
+ /* i'm sorry dave, i can't do that */
+ throw std::out_of_range ("illegal BBT subtraction");
+ }
+
+ result.bars--;
+ result.beats = meter->beats_per_bar();
+ } else {
+
+ /* back one beat */
+
+ result.beats--;
+ }
+
+ /* one down ... */
+ op.beats--;
+
+ /* check if we need to use a new meter section: has subtracting beats to result taken us
+ to before the start of the current meter section? in which case, use the prior one.
+ */
+
+ if (result < meter->start() && next_meter != meter_sections.rend()) {
+ meter = *next_meter;
+ ++next_meter;
+ }
+ }
+
+ /* finally, subtract bars */
+
+ if (op.bars >= result.bars) {
+ /* i'm sorry dave, i can't do that */
+ throw std::out_of_range ("illegal BBT subtraction");
+ }
+
+ result.bars -= op.bars;
+ return result;
+}
+
+/** Compare the time of this with that of another MetricSection.
+ * @param with_bbt True to compare using ::start(), false to use ::frame().
+ * @return -1 for less than, 0 for equal, 1 for greater than.
+ */
+
+int
+MetricSection::compare (MetricSection* other, bool with_bbt) const
+{
+ if (with_bbt) {
+ if (start() == other->start()) {
+ return 0;
+ } else if (start() < other->start()) {
+ return -1;
+ } else {
+ return 1;
+ }
+ } else {
+ if (frame() == other->frame()) {
+ return 0;
+ } else if (frame() < other->frame()) {
+ return -1;
+ } else {
+ return 1;
+ }
+ }
+
+ /* NOTREACHED */
+ return 0;
}
projects / ardour.git / blobdiff