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diff --git a/src/types.h b/src/types.h
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+/*
+    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+
+    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.
+
+*/
+
+#ifndef LIBDCP_CHANNEL_H
+#define LIBDCP_CHANNEL_H
+
+namespace libdcp
+{
+
+/** Identifier for a sound channel */
+enum Channel {
+	LEFT = 0,    ///< left
+	RIGHT = 1,   ///< right
+	CENTRE = 2,  ///< centre
+	LFE = 3,     ///< low-frequency effects (sub)
+	LS = 4,      ///< left surround
+	RS = 5       ///< right surround
+};
+
+}
+
+#endif