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diff --git a/libs/ardour/ardour/beats_samples_converter.h b/libs/ardour/ardour/beats_samples_converter.h
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+/*
+    Copyright (C) 2009 Paul Davis
+    Author: David 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 "evoral/Beats.hpp"
+#include "evoral/TimeConverter.hpp"
+
+#include "ardour/libardour_visibility.h"
+#include "ardour/types.h"
+
+#ifndef __ardour_beats_samples_converter_h__
+#define __ardour_beats_samples_converter_h__
+
+namespace ARDOUR {
+
+class TempoMap;
+
+/** Converter between quarter-note beats and samples.  Takes distances in quarter-note beats or samples
+ *  from some origin (supplied to the constructor in samples), and converts
+ *  them to the opposite unit, taking tempo changes into account.
+ */
+class LIBARDOUR_API BeatsSamplesConverter
+	: public Evoral::TimeConverter<Evoral::Beats,samplepos_t> {
+public:
+	BeatsSamplesConverter (const TempoMap& tempo_map, samplepos_t origin)
+		: Evoral::TimeConverter<Evoral::Beats, samplepos_t> (origin)
+		, _tempo_map(tempo_map)
+	{}
+
+	samplepos_t    to (Evoral::Beats beats) const;
+	Evoral::Beats from (samplepos_t samples) const;
+
+private:
+	const TempoMap& _tempo_map;
+};
+
+/** Converter between quarter-note beats and samples.  Takes distances in quarter-note beats or samples
+ *  from some origin (supplied to the constructor in samples), and converts
+ *  them to the opposite unit, taking tempo changes into account.
+ */
+class LIBARDOUR_API DoubleBeatsSamplesConverter
+	: public Evoral::TimeConverter<double,samplepos_t> {
+public:
+	DoubleBeatsSamplesConverter (const TempoMap& tempo_map, samplepos_t origin)
+		: Evoral::TimeConverter<double, samplepos_t> (origin)
+		, _tempo_map(tempo_map)
+	{}
+
+	samplepos_t          to (double beats) const;
+	double from (samplepos_t samples) const;
+
+private:
+	const TempoMap& _tempo_map;
+};
+
+} /* namespace ARDOUR */
+
+#endif /* __ardour_beats_samples_converter_h__ */