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sound_pcjr.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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-2-1/engines/agi/sound_pcjr.h $
 * $Id: sound_pcjr.h 49870 2010-06-15 17:14:38Z wjpalenstijn $
 *
 */

#ifndef AGI_SOUND_PCJR_H
#define AGI_SOUND_PCJR_H

#include "sound/audiostream.h"

namespace Agi {

#define CHAN_MAX 4

#define SAMPLE_RATE 22050

enum GenType {
      kGenSilence,
      kGenTone,
      kGenPeriod,
      kGenWhite
};

00044 struct SndGenChan {
      const byte *data;
      uint16 duration;
      uint16 avail;     // turned on (1)  but when the channel's data runs out, it's set to (0)
      uint16 dissolveCount;
      byte attenuation;
      byte attenuationCopy;
      
      GenType genType;
      
      // for the sample mixer
      int freqCount;
};

00058 struct ToneChan {
      int avail;

      int noteCount; // length of tone.. duration

      int freqCount;
      int freqCountPrev;
      int atten;  // volume

      GenType genType;
      int genTypePrev;

      int count;
      int scale;
      int sign;
      unsigned int noiseState;            /* noise generator      */
      int feedback;                                   /* noise feedback mask */
};

00077 struct Tone {
      int freqCount;
      int atten;
      GenType type;
};

00083 class SoundGenPCJr : public SoundGen, public Audio::AudioStream {
public:
      SoundGenPCJr(AgiEngine *vm, Audio::Mixer *pMixer);
      ~SoundGenPCJr();

      void play(int resnum);
      void stop(void);

      // AudioStream API
      int readBuffer(int16 *buffer, const int numSamples);

00094       bool isStereo() const {
            return false;
      }

00098       bool endOfData() const {
            return false;
      }

00102       int getRate() const {
            // FIXME: Ideally, we should use _sampleRate.
            return 22050;
      }

private:
      int getNextNote(int ch, Tone *tone);
      int volumeCalc(SndGenChan *chan);

      int chanGen(int chan, int16 *stream, int len);

      int fillNoise(ToneChan *t, int16 *buf, int len);
      int fillSquare(ToneChan *t, int16 *buf, int len);

private:
      SndGenChan _channel[CHAN_MAX];
      ToneChan _tchannel[CHAN_MAX];
      int16 *_chanData;
      int _chanAllocated;

      int _dissolveMethod;
};

} // End of namespace Agi

#endif /* AGI_SOUND_PCJR_H */

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