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diff --git a/scumm/smush/mixer.h b/scumm/smush/mixer.h
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+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2001/2002 The ScummVM project
+ *
+ * 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.
+ *
+ * $Header$
+ *
+ */
+
+#ifndef __MIXER_H_
+#define __MIXER_H_
+
+#include "config.h"
+
+#ifdef DEBUG
+# ifndef NO_DEBUG_MIXER
+#  define DEBUG_MIXER
+# endif
+#else
+# ifdef DEBUG_MIXER
+#  error DEBUG_MIXER defined without DEBUG
+# endif
+#endif
+
+class _Channel;
+
+class SoundRenderer;
+
+/*! 	@brief The class for the player's sound mixer
+
+	This class is used for sound mixing.
+	It contains a list of current track and request them to mix.
+	It then sends the mixed sound samples to the sound renderer.
+
+*/
+class Mixer {
+public:
+	virtual ~Mixer() {};
+	virtual bool init() = 0;
+	virtual _Channel * findChannel(int track) = 0;
+	virtual bool addChannel(_Channel * c) = 0;
+	virtual bool handleFrame() = 0;
+	virtual bool stop() = 0;
+};
+
+#endif