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diff --git a/src/mono_j2k_picture_asset_writer.h b/src/mono_j2k_picture_asset_writer.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_writer.h
+ *  @brief MonoPictureAssetWriter class
+ */
+
+
+#ifndef LIBDCP_MONO_PICTURE_ASSET_WRITER_H
+#define LIBDCP_MONO_PICTURE_ASSET_WRITER_H
+
+
+#include "picture_asset_writer.h"
+#include <memory>
+#include <boost/utility.hpp>
+#include <stdint.h>
+#include <string>
+
+
+namespace dcp {
+
+
+/** @class MonoPictureAssetWriter
+ *  @brief A helper class for writing to MonoPictureAssets
+ *
+ *  Objects of this class can only be created with MonoPictureAsset::start_write().
+ *
+ *  Frames can be written to the MonoPictureAsset by calling write() with a JPEG2000 image
+ *  (a verbatim .j2c file).  finalize() should be called after the last frame has been written,
+ *  but if it is not, it will be called by the destructor (though in that case any error
+ *  during finalization will be ignored).
+ */
+class MonoPictureAssetWriter : public PictureAssetWriter
+{
+public:
+	~MonoPictureAssetWriter();
+
+	FrameInfo write (uint8_t const *, int) override;
+	void fake_write (int size) override;
+	bool finalize () override;
+
+private:
+	friend class MonoPictureAsset;
+
+	MonoPictureAssetWriter (PictureAsset* a, boost::filesystem::path file, bool);
+
+	void start (uint8_t const *, int);
+
+	/* do this with an opaque pointer so we don't have to include
+	   ASDCP headers
+	*/
+	struct ASDCPState;
+	std::shared_ptr<ASDCPState> _state;
+};
+
+
+}
+
+
+#endif