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diff --git a/slideshow/source/inc/iexternalmediashapebase.hxx b/slideshow/source/inc/iexternalmediashapebase.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_IEXTERNALMEDIASHAPEBASE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_INC_IEXTERNALMEDIASHAPEBASE_HXX
+
+#include <memory>
+
+#include "shape.hxx"
+
+
+namespace slideshow::internal
+    {
+        /** Represents a shape containing playable content rendered by
+            external engine (e.g. media or applet).
+
+            This interface adds media handling methods to a shape. It
+            allows starting/stopping and pausing playback.
+        */
+        class IExternalMediaShapeBase : public Shape
+        {
+        public:
+            // Animation methods
+
+
+            /** Notify the Shape that it should start with playback
+
+                This method enters playback mode on all registered
+                views. It makes the media initially visible (for videos).
+             */
+            virtual void play() = 0;
+
+            /** Notify the Shape that it should stop playback
+
+                This method leaves playback mode on all registered
+                views. The media is then rewound to the start, and
+                removed from screen (for videos)
+             */
+            virtual void stop() = 0;
+
+            /** Notify the Shape that it should pause playback
+
+                This method stops playback on all registered
+                views. The media stays visible (for videos)
+             */
+            virtual void pause() = 0;
+
+            /** Query whether the media is currently playing.
+             */
+            virtual bool isPlaying() const = 0;
+
+            /** Set media time in seconds.
+
+            @param fTime
+            Time in seconds of the media time line, that should now be
+            presented
+             */
+            virtual void setMediaTime(double fTime) = 0;
+
+            virtual void setLooping(bool /*bLooping*/){};
+        };
+
+        typedef ::std::shared_ptr< IExternalMediaShapeBase > IExternalMediaShapeBaseSharedPtr;
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_INC_IEXTERNALMEDIASHAPEBASE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */