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diff --git a/src/lib/active_captions.h b/src/lib/active_captions.h
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+++ b/src/lib/active_captions.h
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+/*
+    Copyright (C) 2017-2018 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/>.
+
+*/
+
+/** @file  src/lib/active_captions.h
+ *  @brief ActiveCaptions class.
+ */
+
+#include "dcpomatic_time.h"
+#include "player_caption.h"
+#include <boost/noncopyable.hpp>
+#include <list>
+#include <map>
+
+class Piece;
+
+/** @class ActiveCaptions
+ *  @brief A class to maintain information on active subtitles for Player.
+ */
+class ActiveCaptions : public boost::noncopyable
+{
+public:
+	std::list<PlayerCaption> get_burnt (DCPTimePeriod period, bool always_burn_subtitles) const;
+	void clear_before (DCPTime time);
+	void clear ();
+	void add_from (boost::weak_ptr<Piece> piece, PlayerCaption ps, DCPTime from);
+	std::pair<PlayerCaption, DCPTime> add_to (boost::weak_ptr<Piece> piece, DCPTime to);
+	bool have (boost::weak_ptr<Piece> piece) const;
+
+private:
+	class Period
+	{
+	public:
+		Period () {}
+
+		Period (PlayerCaption s, DCPTime f)
+			: subs (s)
+			, from (f)
+		{}
+
+		PlayerCaption subs;
+		DCPTime from;
+		boost::optional<DCPTime> to;
+	};
+
+	typedef std::map<boost::weak_ptr<Piece>, std::list<Period> > Map;
+
+	Map _data;
+};