--- a
+++ b/libupnpp/upnpavutils.hxx
@@ -0,0 +1,25 @@
+/* Copyright (C) 2014 J.F.Dockes
+ *       This program 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.
+ *
+ *       This program 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 this program; if not, write to the
+ *       Free Software Foundation, Inc.,
+ *       59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _UPNPAVUTILS_HXX_INCLUDED_
+#define _UPNPAVUTILS_HXX_INCLUDED_
+
+// Format milliseconds into H+:MM:SS
+extern std::string upnpduration(int ms);
+// hms to seconds
+extern int upnpdurationtos(const string& dur);
+
+#endif /* _UPNPAVUTILS_HXX_INCLUDED_ */