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diff --git a/arts/midi/timestampmath.h b/arts/midi/timestampmath.h
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+++ b/arts/midi/timestampmath.h
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+    /*
+
+    Copyright (C) 2002 Stefan Westerfeld
+                       [email protected]
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+  
+    This library 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
+    Library General Public License for more details.
+   
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+
+    */
+
+#ifndef ARTS_TIMESTAMPMATH_H
+#define ARTS_TIMESTAMPMATH_H
+
+#include "artsmidi.h"
+#include <kdelibs_export.h>
+namespace Arts {
+
+/**
+ * increments the timestamp by delta
+ */
+KDE_EXPORT void timeStampInc(TimeStamp& t, const TimeStamp& delta);
+
+/**
+ * decrements the timestamp by delta
+ */
+void timeStampDec(TimeStamp& t, const TimeStamp& delta);
+
+/**
+ * stringifies a timestamp
+ */
+std::string timeStampToString(const TimeStamp& t);
+
+/**
+ * converts a timestamp to a double of seconds
+ */
+double timeStampToDouble(const TimeStamp& t);
+
+/**
+ * converts a double of seconds to a timestamp
+ */
+TimeStamp timeStampFromDouble(double d);
+
+/**
+ * returns the maximum of two timestamps
+ */
+TimeStamp timeStampMax(const TimeStamp& t1, const TimeStamp& t2);
+
+}
+
+#endif  /* ARTS_TIMESTAMPMATH_H */