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diff --git a/src/sound_mxf.h b/src/sound_mxf.h
new file mode 100644
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+++ b/src/sound_mxf.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_SOUND_ASSET_H
+#define LIBDCP_SOUND_ASSET_H
+
+/** @file  src/sound_asset.h
+ *  @brief An asset made up of PCM audio data files
+ */
+
+#include "mxf.h"
+#include "types.h"
+#include "metadata.h"
+
+namespace dcp
+{
+
+class SoundFrame;
+class SoundMXF;
+
+class SoundMXFWriter
+{
+public:
+	void write (float const * const *, int);
+	void finalize ();
+
+private:
+	friend class SoundMXF;
+
+	SoundMXFWriter (SoundMXF *);
+
+	/* no copy construction */
+	SoundMXFWriter (SoundMXFWriter const &);
+	SoundMXFWriter& operator= (SoundMXFWriter const &);
+	
+	void write_current_frame ();
+
+	/* do this with an opaque pointer so we don't have to include
+	   ASDCP headers
+	*/
+	   
+	struct ASDCPState;
+	boost::shared_ptr<ASDCPState> _state;
+
+	SoundMXF* _asset;
+	bool _finalized;
+	int _frames_written;
+	int _frame_buffer_offset;
+};
+
+/** @brief An asset made up of WAV files */
+class SoundMXF : public MXF
+{
+public:
+	SoundMXF (boost::filesystem::path directory, boost::filesystem::path mxf_name);
+
+	void read ();
+
+	boost::shared_ptr<SoundMXFWriter> start_write ();
+	
+	bool equals (boost::shared_ptr<const ContentAsset> other, EqualityOptions opt, boost::function<void (NoteType, std::string)> note) const;
+
+	boost::shared_ptr<const SoundFrame> get_frame (int n) const;
+
+	void set_channels (int c) {
+		_channels = c;
+	}
+	
+	int channels () const {
+		return _channels;
+	}
+
+	void set_sampling_rate (int s) {
+		_sampling_rate = s;
+	}
+
+	int sampling_rate () const {
+		return _sampling_rate;
+	}
+
+private:
+	std::string key_type () const;
+	void construct (boost::function<boost::filesystem::path (Channel)> get_path);
+	std::string cpl_node_name () const;
+
+	/** Number of channels in the asset */
+	int _channels;
+	int _sampling_rate;
+};
+
+}
+
+#endif