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diff --git a/src/lib/audio_mapping.h b/src/lib/audio_mapping.h
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+++ b/src/lib/audio_mapping.h
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+/*
+    Copyright (C) 2013 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 DCPOMATIC_AUDIO_MAPPING_H
+#define DCPOMATIC_AUDIO_MAPPING_H
+
+#include <list>
+#include <libdcp/types.h>
+#include <boost/shared_ptr.hpp>
+
+namespace xmlpp {
+	class Node;
+}
+
+namespace cxml {
+	class Node;
+}
+
+/** A many-to-many mapping from some content channels to DCP channels.
+ *  The number of content channels is set on construction and fixed,
+ *  and then each of those content channels can be mapped to zero or
+ *  more DCP channels.
+ */
+class AudioMapping
+{
+public:
+	AudioMapping ();
+	AudioMapping (int);
+	AudioMapping (boost::shared_ptr<const cxml::Node>);
+
+	/* Default copy constructor is fine */
+	
+	void as_xml (xmlpp::Node *) const;
+
+	void add (int, libdcp::Channel);
+	void make_default ();
+
+	std::list<int> dcp_to_content (libdcp::Channel) const;
+	std::list<std::pair<int, libdcp::Channel> > content_to_dcp () const {
+		return _content_to_dcp;
+	}
+
+	int content_channels () const {
+		return _content_channels;
+	}
+	
+	std::list<libdcp::Channel> content_to_dcp (int) const;
+
+private:
+	int _content_channels;
+	std::list<std::pair<int, libdcp::Channel> > _content_to_dcp;
+};
+
+#endif