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diff --git a/src/lib/video_adjuster.h b/src/lib/video_adjuster.h
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+/*
+    Copyright (C) 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/>.
+
+*/
+
+#ifndef DCPOMATIC_VIDEO_ADJUSTER_H
+#define DCPOMATIC_VIDEO_ADJUSTER_H
+
+#include <boost/signals2.hpp>
+
+class Piece;
+class ContentVideo;
+
+/** Parent class for short delays of video content done by the Player
+ *  to work around various problems.
+ */
+class VideoAdjuster
+{
+public:
+	virtual ~VideoAdjuster() {}
+
+	virtual void clear ();
+	void flush ();
+
+	boost::signals2::signal<void (boost::weak_ptr<Piece>, ContentVideo)> Video;
+
+	typedef std::pair<boost::weak_ptr<Piece>, ContentVideo> Store;
+
+protected:
+	std::list<Store> _store;
+};
+
+#endif