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diff --git a/audio/mpu401.h b/audio/mpu401.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef SOUND_MPU401_H
+#define SOUND_MPU401_H
+
+#include "audio/mididrv.h"
+
+////////////////////////////////////////
+//
+// Common MPU401 implementation methods
+//
+////////////////////////////////////////
+
+class MidiDriver_MPU401;
+
+class MidiChannel_MPU401 : public MidiChannel {
+
+private:
+	MidiDriver *_owner;
+	bool _allocated;
+	byte _channel;
+
+public:
+	MidiDriver *device();
+	byte getNumber() { return _channel; }
+	void release() { _allocated = false; }
+
+	void send(uint32 b);
+
+	// Regular messages
+	void noteOff(byte note);
+	void noteOn(byte note, byte velocity);
+	void programChange(byte program);
+	void pitchBend(int16 bend);
+
+	// Control Change messages
+	void controlChange(byte control, byte value);
+	void pitchBendFactor(byte value);
+
+	// SysEx messages
+	void sysEx_customInstrument(uint32 type, const byte *instr);
+
+	// Only to be called by the owner
+	void init(MidiDriver *owner, byte channel);
+	bool allocate();
+};
+
+
+
+class MidiDriver_MPU401 : public MidiDriver {
+private:
+	MidiChannel_MPU401 _midi_channels[16];
+	Common::TimerManager::TimerProc _timer_proc;
+	uint16 _channel_mask;
+
+public:
+	MidiDriver_MPU401();
+
+	virtual void close();
+	void setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc);
+	uint32 getBaseTempo(void) { return 10000; }
+	uint32 property(int prop, uint32 param);
+
+	MidiChannel *allocateChannel();
+	MidiChannel *getPercussionChannel() { return &_midi_channels[9]; }
+};
+
+
+#endif