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sound_driver.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 *
 * cinE Engine is (C) 2004-2005 by CinE Team
 *
 * 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://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/cine/sound_driver.h $
 * $Id: sound_driver.h 22231 2006-04-29 22:33:31Z fingolfin $
 *
 */

#ifndef CINE_SOUNDDRIVER_H_
#define CINE_SOUNDDRIVER_H_

#include "sound/audiostream.h"
#include "sound/fmopl.h"

namespace Audio {
      class Mixer;
}

namespace Cine {
      
class SoundDriver {
public:
      typedef void (*UpdateCallback)(void *);

      virtual ~SoundDriver() {}

      virtual void setupChannel(int channel, const byte *data, int instrument, int volume) = 0;
      virtual void setChannelFrequency(int channel, int frequency) = 0;
      virtual void stopChannel(int channel) = 0;
      virtual void playSound(const byte *data, int channel, int volume) = 0;
      virtual void stopSound() = 0;
      virtual const char *getInstrumentExtension() const = 0;
      
      void setUpdateCallback(UpdateCallback upCb, void *ref);
      void resetChannel(int channel);
      void findNote(int freq, int *note, int *oct) const;

protected:
      UpdateCallback _upCb;
      void *_upRef;

      static const int _noteTable[];
      static const int _noteTableCount;
};

struct AdlibRegisterSoundInstrument {
      uint16 vibrato;
      uint16 attackDecay;
      uint16 sustainRelease;
      uint16 feedbackStrength;
      uint16 keyScaling;
      uint16 outputLevel;
      uint16 freqMod;
};

struct AdlibSoundInstrument {
      byte mode;
      byte channel;
      AdlibRegisterSoundInstrument regMod;
      AdlibRegisterSoundInstrument regCar;
      byte waveSelectMod;
      byte waveSelectCar;
      byte amDepth;
};
      
class AdlibSoundDriver : public SoundDriver, Audio::AudioStream {
public:
      AdlibSoundDriver(Audio::Mixer *mixer);
      virtual ~AdlibSoundDriver();

      // SoundDriver interface
      virtual void setupChannel(int channel, const byte *data, int instrument, int volume);
      virtual void stopChannel(int channel);
      virtual void stopSound();

      // AudioStream interface
      virtual int readBuffer(int16 *buffer, const int numSamples);
      virtual bool isStereo() const { return false; }
      virtual bool endOfData() const { return false; }
      virtual int getRate() const { return _sampleRate; }

      void initCard();
      void update(int16 *buf, int len);
      void setupInstrument(const byte *data, int channel);
      void loadRegisterInstrument(const byte *data, AdlibRegisterSoundInstrument *reg);
      virtual void loadInstrument(const byte *data, AdlibSoundInstrument *asi) = 0;

protected:
      FM_OPL *_opl;
      int _sampleRate;
      Audio::Mixer *_mixer;

      byte _vibrato;
      int _channelsVolumeTable[4];
      AdlibSoundInstrument _instrumentsTable[4];

      static const int _freqTable[];
      static const int _freqTableCount;
      static const int _operatorsTable[];
      static const int _operatorsTableCount;
      static const int _voiceOperatorsTable[];
      static const int _voiceOperatorsTableCount;
};

// Future Wars adlib driver
class AdlibSoundDriverINS : public AdlibSoundDriver {
public:
      AdlibSoundDriverINS(Audio::Mixer *mixer) : AdlibSoundDriver(mixer) {}
      virtual const char *getInstrumentExtension() const { return ".INS"; }
      virtual void loadInstrument(const byte *data, AdlibSoundInstrument *asi);
      virtual void setChannelFrequency(int channel, int frequency);
      virtual void playSound(const byte *data, int channel, int volume);
};

// Operation Stealth adlib driver
class AdlibSoundDriverADL : public AdlibSoundDriver {
public:
      AdlibSoundDriverADL(Audio::Mixer *mixer) : AdlibSoundDriver(mixer) {}
      virtual const char *getInstrumentExtension() const { return ".ADL"; }
      virtual void loadInstrument(const byte *data, AdlibSoundInstrument *asi);
      virtual void setChannelFrequency(int channel, int frequency);
      virtual void playSound(const byte *data, int channel, int volume);
};

extern SoundDriver *g_soundDriver; // TEMP

} // End of namespace Cine

#endif /* CINE_SOUNDDRIVER_H_ */

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