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diff --git a/engines/gob/sound/adlib.h b/engines/gob/sound/adlib.h
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+++ b/engines/gob/sound/adlib.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 GOB_SOUND_ADLIB_H
+#define GOB_SOUND_ADLIB_H
+
+#include "common/mutex.h"
+#include "sound/audiostream.h"
+#include "sound/mixer.h"
+#include "sound/fmopl.h"
+
+namespace Gob {
+
+class GobEngine;
+
+class AdLib : public Audio::AudioStream {
+public:
+	AdLib(Audio::Mixer &mixer);
+	~AdLib();
+
+	bool isPlaying() const;
+	int getIndex() const;
+	bool getRepeating() const;
+
+	void setRepeating(int32 repCount);
+
+	void startPlay();
+	void stopPlay();
+
+	bool load(const char *fileName);
+	bool load(byte *data, uint32 size, int index = -1);
+	void unload();
+
+// AudioStream API
+	int  readBuffer(int16 *buffer, const int numSamples);
+	bool isStereo()    const { return false;     }
+	bool endOfData()   const { return !_playing; }
+	bool endOfStream() const { return false;     }
+	int  getRate()     const { return _rate;     }
+
+protected:
+	static const unsigned char _operators[];
+	static const unsigned char _volRegNums [];
+
+	Audio::Mixer *_mixer;
+	Audio::SoundHandle _handle;
+	FM_OPL *_opl;
+
+	Common::Mutex _mutex;
+
+	uint32 _rate;
+
+	byte *_data;
+	byte *_playPos;
+	uint32 _dataSize;
+
+	short _freqs[25][12];
+	byte _notes[11];
+	byte _notCol[11];
+	byte _notLin[11];
+	bool _notOn[11];
+	byte _pollNotes[16];
+
+	int _samplesTillPoll;
+	int32 _repCount;
+
+	bool _playing;
+	bool _first;
+	bool _ended;
+	bool _needFree;
+
+	int _index;
+
+	void writeOPL(byte reg, byte val);
+	void setFreqs();
+	void reset();
+	void setVoices();
+	void setVoice(byte voice, byte instr, bool set);
+	void setKey(byte voice, byte note, bool on, bool spec);
+	void setVolume(byte voice, byte volume);
+	void pollMusic();
+};
+
+} // End of namespace Gob
+
+#endif // GOB_SOUND_ADLIB_H