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Improve the performance of TempoMap::frame_at_beat ().

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- should be a no-op
This commit is contained in:
nick_m 2016-06-20 00:06:56 +10:00
parent 6b0eadc62f
commit c6f2095fb7
1 changed files with 24 additions and 3 deletions
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27
libs/ardour/tempo.cc
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@ -1469,12 +1469,33 @@ TempoMap::frame_at_beat (const double& beat) const
return frame_at_beat_locked (_metrics, beat);
}
/* meter section based */
/* meter & tempo section based */
framecnt_t
TempoMap::frame_at_beat_locked (const Metrics& metrics, const double& beat) const
{
const TempoSection* prev_t = &tempo_section_at_beat_locked (metrics, beat);
const MeterSection* prev_m = &meter_section_at_beat_locked (metrics, beat);
MeterSection* prev_m = 0;
TempoSection* prev_t = 0;
for (Metrics::const_iterator i = metrics.begin(); i != metrics.end(); ++i) {
MeterSection* m;
if ((m = dynamic_cast<MeterSection*> (*i)) != 0) {
if (prev_m && m->beat() > beat) {
break;
}
prev_m = m;
}
}
for (Metrics::const_iterator i = metrics.begin(); i != metrics.end(); ++i) {
TempoSection* t;
if ((t = dynamic_cast<TempoSection*> (*i)) != 0) {
if (prev_t && ((t->pulse() - prev_m->pulse()) * prev_m->note_divisor()) + prev_m->beat() > beat) {
break;
}
prev_t = t;
}
}
return prev_t->frame_at_pulse (((beat - prev_m->beat()) / prev_m->note_divisor()) + prev_m->pulse(), _frame_rate);
}