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diff --git a/src/stereo_j2k_picture_frame.h b/src/stereo_j2k_picture_frame.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/stereo_picture_frame.h
+ *  @brief StereoPictureFrame class
+ */
+
+
+#ifndef LIBDCP_STEREO_PICTURE_FRAME_H
+#define LIBDCP_STEREO_PICTURE_FRAME_H
+
+
+#include "asset_reader.h"
+#include <memory>
+#include <boost/filesystem.hpp>
+#include <stdint.h>
+#include <string>
+
+
+namespace ASDCP {
+	namespace JP2K {
+		struct SFrameBuffer;
+		class MXFSReader;
+	}
+	class AESDecContext;
+}
+
+
+namespace dcp {
+
+
+class OpenJPEGImage;
+class StereoPictureFrame;
+
+
+/** @class StereoPictureFrame
+ *  @brief A single frame of a 3D (stereoscopic) picture asset
+ */
+class StereoPictureFrame
+{
+public:
+	StereoPictureFrame ();
+
+	StereoPictureFrame (StereoPictureFrame const &) = delete;
+	StereoPictureFrame& operator= (StereoPictureFrame const &) = delete;
+
+	std::shared_ptr<OpenJPEGImage> xyz_image (Eye eye, int reduce = 0) const;
+
+	class Part : public Data
+	{
+	public:
+		Part (std::shared_ptr<ASDCP::JP2K::SFrameBuffer> buffer, Eye eye);
+
+		uint8_t const * data () const override;
+		uint8_t * data () override;
+		int size () const override;
+
+	private:
+		friend class StereoPictureFrame;
+
+		ASDCP::JP2K::FrameBuffer& mono () const;
+
+		std::shared_ptr<ASDCP::JP2K::SFrameBuffer> _buffer;
+		Eye _eye;
+	};
+
+	std::shared_ptr<Part> left () const;
+	std::shared_ptr<Part> right () const;
+
+private:
+	/* XXX: this is a bit of a shame, but I tried friend StereoPictureAssetReader and it's
+	   rejected by some (seemingly older) GCCs.
+	*/
+	friend class AssetReader<ASDCP::JP2K::MXFSReader, StereoPictureFrame>;
+
+	StereoPictureFrame (ASDCP::JP2K::MXFSReader* reader, int n, std::shared_ptr<DecryptionContext>, bool check_hmac);
+
+	std::shared_ptr<ASDCP::JP2K::SFrameBuffer> _buffer;
+};
+
+
+}
+
+
+#endif