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diff --git a/src/lib/subtitle_encoder.h b/src/lib/subtitle_encoder.h
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+/*
+    Copyright (C) 2019 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/>.
+
+*/
+
+#include "types.h"
+#include "player_text.h"
+#include "dcp_text_track.h"
+#include "encoder.h"
+#include "dcpomatic_time.h"
+#include <boost/weak_ptr.hpp>
+
+namespace dcp {
+	class SubtitleAsset;
+}
+
+class Film;
+
+/** @class SubtitleEncoder.
+ *  @brief An `encoder' which extracts a film's subtitles to DCP XML format.
+ */
+class SubtitleEncoder : public Encoder
+{
+public:
+	SubtitleEncoder (boost::shared_ptr<const Film> film, boost::shared_ptr<Job> job, boost::filesystem::path output, bool split_reels);
+
+	void go ();
+
+	/** @return the number of frames that are done */
+	Frame frames_done () const;
+
+	bool finishing () const {
+		return false;
+	}
+
+private:
+	void text (PlayerText subs, TextType type, boost::optional<DCPTextTrack> track, dcpomatic::DCPTimePeriod period);
+
+	std::vector<std::pair<boost::shared_ptr<dcp::SubtitleAsset>, boost::filesystem::path> > _assets;
+	std::vector<dcpomatic::DCPTimePeriod> _reels;
+	bool _split_reels;
+	int _reel_index;
+	boost::optional<dcpomatic::DCPTime> _last;
+	dcpomatic::DCPTime _length;
+};