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diff --git a/src/sound_asset.h b/src/sound_asset.h
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+/*
+    Copyright (C) 2012-2014 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.
+
+*/
+
+/** @file  src/sound_asset.h
+ *  @brief SoundAsset class
+ */
+
+#ifndef LIBDCP_SOUND_ASSET_H
+#define LIBDCP_SOUND_ASSET_H
+
+#include "mxf.h"
+#include "types.h"
+#include "metadata.h"
+
+namespace dcp
+{
+
+class SoundFrame;
+class SoundAssetWriter;
+
+/** @class SoundAsset
+ *  @brief Representation of a sound asset
+ */
+class SoundAsset : public Asset, public MXF
+{
+public:
+	SoundAsset (boost::filesystem::path file);
+	SoundAsset (Fraction edit_rate, int sampling_rate, int channels);
+
+	boost::shared_ptr<SoundAssetWriter> start_write (boost::filesystem::path file, Standard standard);
+	
+	bool equals (
+		boost::shared_ptr<const Asset> other,
+		EqualityOptions opt,
+		NoteHandler note
+		) const;
+
+	boost::shared_ptr<const SoundFrame> get_frame (int n) const;
+
+	/** @return number of channels */
+	int channels () const {
+		return _channels;
+	}
+
+	/** @return sampling rate in Hz */
+	int sampling_rate () const {
+		return _sampling_rate;
+	}
+
+	Fraction edit_rate () const {
+		return _edit_rate;
+	}
+
+	int64_t intrinsic_duration () const {
+		return _intrinsic_duration;
+	}
+	
+private:
+	friend class SoundAssetWriter;
+	
+	std::string pkl_type (Standard standard) const;
+
+	Fraction _edit_rate;
+	/** The total length of this content in video frames.  The amount of
+	 *  content presented may be less than this.
+	 */
+	int64_t _intrinsic_duration;
+	int _channels;      ///< number of channels
+	int _sampling_rate; ///< sampling rate in Hz
+};
+
+}
+
+#endif