1 files changed, 54 insertions, 0 deletions
diff --git a/libs/ardour/beats_frames_converter.cc b/libs/ardour/beats_frames_converter.cc
new file mode 100644
index 0000000000..736068e690
--- /dev/null
+++ b/libs/ardour/beats_frames_converter.cc
@@ -0,0 +1,54 @@
+/*
+    Copyright (C) 2009 Paul Davis 
+    Author: Dave Robillard
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id: midiregion.h 733 2006-08-01 17:19:38Z drobilla $
+*/
+
+#include <ardour/audioengine.h>
+#include <ardour/beats_frames_converter.h>
+#include <ardour/session.h>
+#include <ardour/tempo.h>
+
+namespace ARDOUR {
+
+nframes_t
+BeatsFramesConverter::to(double beats) const
+{
+	// FIXME: assumes tempo never changes after origin
+	const Tempo& tempo = _session.tempo_map().tempo_at(_origin);
+	const double frames_per_beat = tempo.frames_per_beat(
+			_session.engine().frame_rate(),
+			_session.tempo_map().meter_at(_origin));
+
+	return lrint(beats * frames_per_beat);
+}
+
+double
+BeatsFramesConverter::from(nframes_t frames) const
+{
+	// FIXME: assumes tempo never changes after origin
+	const Tempo& tempo = _session.tempo_map().tempo_at(_origin);
+	const double frames_per_beat = tempo.frames_per_beat(
+			_session.engine().frame_rate(),
+			_session.tempo_map().meter_at(_origin));
+
+	return frames / frames_per_beat;
+}
+
+} /* namespace ARDOUR */
+