diff -r 3331b30e4ef1 -r 88fde28bbda6 QTfrontend/util/LibavInteraction.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/util/LibavInteraction.h	Sat Nov 03 00:34:35 2012 +0400
@@ -0,0 +1,51 @@
+/*
+ * Hedgewars, a free turn based strategy game
+ * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@gmail.com>
+ *
+ * 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; version 2 of the License
+ *
+ * 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 LIBAV_ITERACTION
+#define LIBAV_ITERACTION
+
+#include <QComboBox>
+
+/**
+ * @brief Class for interacting with ffmpeg/libav libraries
+ *
+ * @see <a href="http://en.wikipedia.org/wiki/Singleton_pattern">singleton pattern</a>
+ */
+class LibavInteraction : public QObject
+{
+    Q_OBJECT;
+
+    LibavInteraction();
+
+public:
+
+    static LibavInteraction & instance();
+
+    // fill combo box with known file formats
+    void fillFormats(QComboBox * pFormats);
+
+    // fill combo boxes with known codecs for given formats
+    void fillCodecs(const QString & format, QComboBox * pVCodecs, QComboBox * pACodecs);
+
+    QString getExtension(const QString & format);
+
+    // get information about file (duration, resolution etc) in multiline string
+    QString getFileInfo(const QString & filepath);
+};
+
+#endif // LIBAV_ITERACTION