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pcspk.h

/* 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 "common/mutex.h"

namespace Audio {

00033 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);

00059       bool isStereo() const   { return false; }
00060       bool endOfData() const  { return false; }
00061       bool endOfStream() const { return false; }
00062       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

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