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diff --git a/libs/evoral/evoral/TimeConverter.hpp b/libs/evoral/evoral/TimeConverter.hpp
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+/* This file is part of Evoral.
+ * Copyright (C) 2009 Dave Robillard <http://drobilla.net>
+ * Copyright (C) 2009 Paul Davis
+ * 
+ * Evoral 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.
+ * 
+ * Evoral 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 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.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef EVORAL_TIME_CONVERTER_HPP
+#define EVORAL_TIME_CONVERTER_HPP
+
+namespace Evoral {
+
+/** A bidirectional converter between two different time units.
+ *
+ * Think of the conversion method names as if they are written in-between
+ * the two template parameters (i.e. "A <name> B").
+ */
+template<typename A, typename B>
+class TimeConverter {
+public:
+	virtual ~TimeConverter() {}
+
+	/** Convert A time to B time (A to B) */
+	virtual B to(A a) const = 0;
+	
+	/** Convert B time to A time (A from B) */
+	virtual A from(B b) const = 0;
+};
+
+} // namespace Evoral
+
+#endif // EVORAL_TIME_CONVERTER_HPP