Tempo ramps - restore bbt settings in tempo dialog for audio-locked tempo markers

[ardour.git] / libs / ardour / tempo.cc

diff --git a/libs/ardour/tempo.cc b/libs/ardour/tempo.cc
index ed35c2b565d0a6d9d3354480369a9a52a555a4fd..c27bc95b3a6bfb1cb2aafcdd018750a9998989e7 100644 (file)
--- a/libs/ardour/tempo.cc
+++ b/libs/ardour/tempo.cc
@@ -824,6 +824,30 @@ TempoMap::do_insert (MetricSection* section)
        }
 }
 
+/*
+This is for a gui who needs to know the frame of a beat if a proposed tempo section were to be placed there.
+You probably shouldn't use this unless you know what you're doing,
+as it doesn't recompute the tempo map and will make a ramp invalid intil that next happens.
+It is assumed that the next frame calculation is the last time you need this c_func before the next do_insert() and/or recompute_map().
+*/
+void
+TempoMap::replace_c_func_from_tempo_and_beat (const double& bpm, const double& beat)
+{
+       Glib::Threads::RWLock::WriterLock lm (lock);
+       TempoSection* prev_ts = 0;
+       TempoSection* t;
+
+       for (Metrics::iterator i = metrics.begin(); i != metrics.end(); ++i) {
+               if ((t = dynamic_cast<TempoSection*> (*i)) != 0) {
+                       if (prev_ts && t->beat() > prev_ts->beat()) {
+                               prev_ts->set_c_func_from_tempo_and_beat (bpm, beat, _frame_rate);
+                               break;
+                       }
+                       prev_ts = t;
+               }
+       }
+}
+
 void
 TempoMap::replace_tempo (const TempoSection& ts, const Tempo& tempo, const double& where, TempoSection::Type type)
 {