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diff --git a/src/j2k_picture_asset_writer.h b/src/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/picture_asset_writer.h
+ *  @brief PictureAssetWriter and FrameInfo classes.
+ */
+
+
+#ifndef LIBDCP_PICTURE_ASSET_WRITER_H
+#define LIBDCP_PICTURE_ASSET_WRITER_H
+
+
+#include "asset_writer.h"
+#include "metadata.h"
+#include <boost/utility.hpp>
+#include <memory>
+#include <stdint.h>
+#include <string>
+
+
+namespace dcp {
+
+
+class Data;
+class PictureAsset;
+
+
+/** @class FrameInfo
+ *  @brief Information about a single frame (either a monoscopic frame or a left *or* right eye stereoscopic frame)
+ */
+struct FrameInfo
+{
+	FrameInfo () {}
+
+	FrameInfo (uint64_t o, uint64_t s, std::string h)
+		: offset (o)
+		, size (s)
+		, hash (h)
+	{}
+
+	uint64_t offset = 0;
+	uint64_t size = 0;
+	std::string hash;
+};
+
+
+/** @class PictureAssetWriter
+ *  @brief Parent class for classes which write picture assets.
+ */
+class PictureAssetWriter : public AssetWriter
+{
+public:
+	virtual FrameInfo write (uint8_t const *, int) = 0;
+	virtual void fake_write (int) = 0;
+
+	FrameInfo write (Data const& data);
+
+protected:
+	template <class P, class Q>
+	friend void start (PictureAssetWriter *, std::shared_ptr<P>, Q *, uint8_t const *, int);
+
+	PictureAssetWriter (PictureAsset *, boost::filesystem::path, bool);
+
+	PictureAsset* _picture_asset = nullptr;
+	bool _overwrite = false;
+};
+
+
+}
+
+
+#endif