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diff --git a/audio/softsynth/pcspk.h b/audio/softsynth/pcspk.h
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+++ b/audio/softsynth/pcspk.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_SOFTSYNTH_PCSPK_H
+#define SOUND_SOFTSYNTH_PCSPK_H
+
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+#include "common/mutex.h"
+
+namespace Audio {
+
+class PCSpeaker : public AudioStream {
+public:
+	enum WaveForm {
+		kWaveFormSquare = 0,
+		kWaveFormSine,
+		kWaveFormSaw,
+		kWaveFormTriangle
+	};
+
+	PCSpeaker(int rate = 44100);
+	~PCSpeaker();
+
+	/** Play a note for length ms.
+	 *
+	 *  If length is negative, play until told to stop.
+	 */
+	void play(WaveForm wave, int freq, int32 length);
+	/** Stop the currently playing note after delay ms. */
+	void stop(int32 delay = 0);
+	/** Adjust the volume. */
+	void setVolume(byte volume);
+
+	bool isPlaying() const;
+
+	int readBuffer(int16 *buffer, const int numSamples);
+
+	bool isStereo() const	{ return false; }
+	bool endOfData() const	{ return false; }
+	bool endOfStream() const { return false; }
+	int getRate() const	{ return _rate; }
+
+protected:
+	Common::Mutex _mutex;
+
+	int _rate;
+	WaveForm _wave;
+	bool _playForever;
+	uint32 _oscLength;
+	uint32 _oscSamples;
+	uint32 _remainingSamples;
+	uint32 _mixedSamples;
+	byte _volume;
+
+	typedef int8 (*generatorFunc)(uint32, uint32);
+	static const generatorFunc generateWave[];
+
+	static int8 generateSquare(uint32 x, uint32 oscLength);
+	static int8 generateSine(uint32 x, uint32 oscLength);
+	static int8 generateSaw(uint32 x, uint32 oscLength);
+	static int8 generateTriangle(uint32 x, uint32 oscLength);
+};
+
+} // End of namespace Audio
+
+#endif // SOUND_SOFTSYNTH_PCSPEAKER_H