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diff --git a/src/lib/audio_mapping.h 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 DVDOMATIC_AUDIO_MAPPING_H
+#define DVDOMATIC_AUDIO_MAPPING_H
+
+#include <list>
+#include <string>
+#include <libdcp/types.h>
+#include <boost/shared_ptr.hpp>
+#include "audio_content.h"
+
+class AudioMapping
+{
+public:
+	void as_xml (xmlpp::Node *) const;
+	void set_from_xml (ContentList const &, boost::shared_ptr<const cxml::Node>);
+	
+	struct Channel {
+		Channel (boost::weak_ptr<const AudioContent> c, int i)
+			: content (c)
+			, index (i)
+		{}
+		
+		boost::weak_ptr<const AudioContent> content;
+		int index;
+	};
+
+	void add (Channel, libdcp::Channel);
+
+	int dcp_channels () const;
+	std::list<Channel> dcp_to_content (libdcp::Channel) const;
+	std::list<std::pair<Channel, libdcp::Channel> > content_to_dcp () const {
+		return _content_to_dcp;
+	}
+
+	std::list<Channel> content_channels () const;
+	std::list<libdcp::Channel> content_to_dcp (Channel) const;
+
+private:
+	std::list<std::pair<Channel, libdcp::Channel> > _content_to_dcp;
+};
+
+extern bool operator== (AudioMapping::Channel const &, AudioMapping::Channel const &);
+
+#endif