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diff --git a/src/lib/j2k_encoder_backend.h b/src/lib/j2k_encoder_backend.h
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+++ b/src/lib/j2k_encoder_backend.h
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+/*
+    Copyright (C) 2021 Carl Hetherington <cth@carlh.net>
+
+    This file is part of DCP-o-matic.
+
+    DCP-o-matic 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.
+
+    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#ifndef DCPOMATIC_J2K_ENCODER_BACKEND_H
+#define DCPOMATIC_J2K_ENCODER_BACKEND_H
+
+
+#include <boost/optional.hpp>
+#include <dcp/array_data.h>
+
+
+class DCPVideo;
+
+
+class J2KEncoderBackend
+{
+public:
+	J2KEncoderBackend () {}
+
+	J2KEncoderBackend (J2KEncoderBackend const&) = delete;
+	J2KEncoderBackend& operator= (J2KEncoderBackend const&) = delete;
+
+	virtual boost::optional<dcp::ArrayData> encode (DCPVideo video) = 0;
+};
+
+
+#endif