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diff --git a/src/mono_j2k_picture_asset.h b/src/mono_j2k_picture_asset.h
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+/*
+    Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of libdcp.
+
+    libdcp 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.
+
+    libdcp 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 libdcp.  If not, see <http://www.gnu.org/licenses/>.
+
+    In addition, as a special exception, the copyright holders give
+    permission to link the code of portions of this program with the
+    OpenSSL library under certain conditions as described in each
+    individual source file, and distribute linked combinations
+    including the two.
+
+    You must obey the GNU General Public License in all respects
+    for all of the code used other than OpenSSL.  If you modify
+    file(s) with this exception, you may extend this exception to your
+    version of the file(s), but you are not obligated to do so.  If you
+    do not wish to do so, delete this exception statement from your
+    version.  If you delete this exception statement from all source
+    files in the program, then also delete it here.
+*/
+
+
+/** @file  src/mono_picture_asset.cc
+ *  @brief MonoPictureAsset class
+ */
+
+
+#ifndef LIBDCP_MONO_PICTURE_ASSET_H
+#define LIBDCP_MONO_PICTURE_ASSET_H
+
+
+#include "picture_asset.h"
+#include "mono_picture_asset_reader.h"
+
+
+namespace dcp {
+
+
+class MonoPictureAssetWriter;
+
+
+/** @class MonoPictureAsset
+ *  @brief A 2D (monoscopic) picture asset
+ */
+class MonoPictureAsset : public PictureAsset
+{
+public:
+	/** Create a MonoPictureAsset by reading a file.
+	 *  @param file Asset file to read.
+	 */
+	explicit MonoPictureAsset (boost::filesystem::path file);
+
+	/** Create a MonoPictureAsset with a given edit rate.
+	 *  @param edit_rate Edit rate (i.e. frame rate) in frames per second.
+	 *  @param standard DCP standard (INTEROP or SMPTE).
+	 */
+	MonoPictureAsset(Fraction edit_rate, Standard standard);
+
+	/** Start a progressive write to a MonoPictureAsset.
+	 *  @path file File to write to.
+	 *  @path behaviour OVERWRITE_EXISTING to overwrite and potentially add to an existing file
+	 *  (after a write previously failed), MAKE_NEW to create a new file.
+	 *  If in doubt, use MAKE_NEW here.
+	 */
+	std::shared_ptr<PictureAssetWriter> start_write(boost::filesystem::path file, Behaviour behaviour) override;
+	std::shared_ptr<MonoPictureAssetReader> start_read () const;
+
+	bool equals (
+		std::shared_ptr<const Asset> other,
+		EqualityOptions const& opt,
+		NoteHandler note
+		) const override;
+
+private:
+	std::string cpl_node_name () const;
+};
+
+
+}
+
+
+#endif