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sound_sarien.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_sarien.h $
 * $Id: sound_sarien.h 49870 2010-06-15 17:14:38Z wjpalenstijn $
 *
 */

#ifndef AGI_SOUND_SARIEN_H
#define AGI_SOUND_SARIEN_H

#include "sound/audiostream.h"

namespace Agi {

#define BUFFER_SIZE     410

#define WAVEFORM_SIZE   64
#define ENV_ATTACK      10000       /**< envelope attack rate */
#define ENV_DECAY       1000        /**< envelope decay rate */
#define ENV_SUSTAIN     100         /**< envelope sustain level */
#define ENV_RELEASE     7500        /**< envelope release rate */
#define NUM_CHANNELS    7           /**< number of sound channels */

enum AgiSoundFlags {
      AGI_SOUND_LOOP          = 0x0001,
      AGI_SOUND_ENVELOPE      = 0x0002
};
enum AgiSoundEnv {
      AGI_SOUND_ENV_ATTACK    = 3,
      AGI_SOUND_ENV_DECAY           = 2,
      AGI_SOUND_ENV_SUSTAIN   = 1,
      AGI_SOUND_ENV_RELEASE   = 0
};


/**
 * AGI engine sound channel structure.
 */
00057 struct ChannelInfo {
      AgiSoundEmuType type;
      const uint8 *ptr; // Pointer to the AgiNote data
      const int16 *ins;
      int32 size;
      uint32 phase;
      uint32 flags;     // ORs values from AgiSoundFlags
      AgiSoundEnv adsr;
      int32 timer;
      uint32 end;
      uint32 freq;
      uint32 vol;
      uint32 env;
};

00072 class SoundGenSarien : public SoundGen, public Audio::AudioStream {
public:
      SoundGenSarien(AgiEngine *vm, Audio::Mixer *pMixer);
      ~SoundGenSarien();

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

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

00083       bool isStereo() const {
            return false;
      }

00087       bool endOfData() const {
            return false;
      }

00091       int getRate() const {
            // FIXME: Ideally, we should use _sampleRate.
            return 22050;
      }

private:
      ChannelInfo _chn[NUM_CHANNELS];
      uint8 _env;

      int16 *_sndBuffer;
      const int16 *_waveform;

      bool _useChorus;

      bool _playing;
      int _playingSound;

private:
      void playSound();
      uint32 mixSound();
      void fillAudio(int16 *stream, uint len);

      void stopNote(int i);
      void playNote(int i, int freq, int vol);

};

} // End of namespace Agi

#endif /* AGI_SOUND_SARIEN_H */

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