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diff --git a/slideshow/source/engine/activities/discreteactivitybase.hxx b/slideshow/source/engine/activities/discreteactivitybase.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_ENGINE_ACTIVITIES_DISCRETEACTIVITYBASE_HXX
+#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_DISCRETEACTIVITYBASE_HXX
+
+#include "activitybase.hxx"
+#include <wakeupevent.hxx>
+
+#include <vector>
+
+
+namespace slideshow::internal
+    {
+        /** Specialization of ActivityBase for discrete time activities.
+
+            A discrete time activity is one where time proceeds in
+            discrete steps, i.e. at given time instants.
+        */
+        class DiscreteActivityBase : public ActivityBase
+        {
+        public:
+            explicit DiscreteActivityBase( const ActivityParameters& rParms );
+
+            /** Hook for derived classes.
+
+                This method is called for each discrete time
+                instant, with nFrame denoting the frame number
+                (starting with 0)
+
+                @param nFrame
+                Current frame number.
+
+                @param nRepeatCount
+                Number of full repeats already performed
+            */
+            virtual void perform( sal_uInt32 nFrame, sal_uInt32 nRepeatCount ) const = 0;
+            virtual void dispose() override;
+            virtual bool perform() override;
+
+        protected:
+            virtual void startAnimation() override;
+
+            sal_uInt32 calcFrameIndex( sal_uInt32       nCurrCalls,
+                                       ::std::size_t    nVectorSize ) const;
+
+            sal_uInt32 calcRepeatCount( sal_uInt32      nCurrCalls,
+                                        ::std::size_t   nVectorSize ) const;
+
+            ::std::size_t getNumberOfKeyTimes() const { return maDiscreteTimes.size(); }
+
+        private:
+            WakeupEventSharedPtr            mpWakeupEvent;
+            const ::std::vector< double >   maDiscreteTimes;
+            const double                    mnSimpleDuration;
+            sal_uInt32                      mnCurrPerformCalls;
+        };
+
+}
+
+#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_ACTIVITIES_DISCRETEACTIVITYBASE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */