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diff --git a/src/mono_mpeg2_picture_frame.h b/src/mono_mpeg2_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.
+*/
+
+
+#ifndef LIBDCP_MONO_MPEG2_PICTURE_FRAME_H
+#define LIBDCP_MONO_MPEG2_PICTURE_FRAME_H
+
+
+#include "asset_reader.h"
+#include "data.h"
+
+
+namespace dcp {
+
+
+class MonoMPEG2PictureFrame : public Data
+{
+public:
+	MonoMPEG2PictureFrame(MonoMPEG2PictureFrame const&) = delete;
+	MonoMPEG2PictureFrame& operator=(MonoMPEG2PictureFrame const&) = delete;
+
+	/** @return Pointer to MPEG2 data */
+	uint8_t const * data() const override;
+
+	/** @return Pointer to MPEG2 data */
+	uint8_t* data () override;
+
+	/** @return Size of MPEG2 data in bytes */
+	int size() const override;
+
+private:
+	/* XXX: this is a bit of a shame, but I tried friend MonoMPEG2PictureAssetReader and it's
+	   rejected by some (seemingly older) GCCs.
+	*/
+	friend class AssetReader<ASDCP::MPEG2::MXFReader, MonoMPEG2PictureFrame>;
+
+	MonoMPEG2PictureFrame(ASDCP::MPEG2::MXFReader* reader, int n, std::shared_ptr<DecryptionContext>, bool check_hmac);
+
+	std::shared_ptr<ASDCP::MPEG2::FrameBuffer> _buffer;
+};
+
+
+}
+
+
+#endif