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sound.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 *
 * Copyright (C) 1999-2001 Sarien 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/agi/sound.h $
 * $Id: sound.h 22611 2006-05-24 14:25:42Z eriktorbjorn $
 *
 */

#ifndef AGI_SOUND_H
#define AGI_SOUND_H

#include "agi/agi.h"

namespace Agi {

#define BUFFER_SIZE     410

#define SOUND_EMU_NONE  0
#define SOUND_EMU_PC    1
#define SOUND_EMU_TANDY 2
#define SOUND_EMU_MAC   3
#define SOUND_EMU_AMIGA 4

#define SOUND_PLAYING   0x01
#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 */

/**
 * AGI engine sound driver structure.
 */
00051 struct sound_driver {
      char *description;
      int (*init) (int16 * buffer);
      void (*deinit) (void);
};

/**
 * AGI sound resource structure.
 */
00060 struct agi_sound {
00061       uint32 flen;            /**< size of raw data */
00062       uint8 *rdata;           /**< raw sound data */
00063       uint8 flags;            /**< sound flags */
00064       uint16 type;            /**< sound resource type */
};

/**
 * AGI sound note structure.
 */
00070 struct agi_note {
00071       uint8 dur_lo;           /**< LSB of note duration */
00072       uint8 dur_hi;                 /**< MSB of note duration */
00073       uint8 frq_0;                  /**< LSB of note frequency */
00074       uint8 frq_1;                  /**< MSB of note frequency */
00075       uint8 vol;              /**< note volume */
};

/**
 * AGI engine sound channel structure.
 */
00081 struct channel_info {
#define AGI_SOUND_SAMPLE      0x0001
#define AGI_SOUND_MIDI        0x0002
#define AGI_SOUND_4CHN        0x0008
      uint32 type;
      struct agi_note *ptr;
      int16 *ins;
      int32 size;
      uint32 phase;
#define AGI_SOUND_LOOP        0x0001
#define AGI_SOUND_ENVELOPE    0x0002
      uint32 flags;
#define AGI_SOUND_ENV_ATTACK  3
#define AGI_SOUND_ENV_DECAY   2
#define AGI_SOUND_ENV_SUSTAIN 1
#define AGI_SOUND_ENV_RELEASE 0
      uint32 adsr;
      int32 timer;
      uint32 end;
      uint32 freq;
      uint32 vol;
      uint32 env;
};

void decode_sound(int);
void unload_sound(int);
void play_sound(void);
int init_sound(void);
void deinit_sound(void);
void start_sound(int, int);
void stop_sound(void);
uint32 mix_sound(void);
int load_instruments(char *fname);

extern struct sound_driver *snd;

#endif                        /* AGI_SOUND_H */

} // End of namespace Agi

#include "sound/audiostream.h"

namespace Audio {
class Mixer;
} // End of namespace Audio

namespace Agi {

class AGIMusic : public Audio::AudioStream {
public:
      AGIMusic(Audio::Mixer * pMixer);
      ~AGIMusic(void);
      virtual void setVolume(uint8 volume);

      // AudioStream API
      int readBuffer(int16 * buffer, const int numSamples) {
            premixerCall(buffer, numSamples / 2);
            return numSamples;
      }

      bool isStereo() const {
            return false;
      }

      bool endOfData() const {
            return false;
      }

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

private:
      Audio::Mixer * _mixer;
      uint32 _sampleRate;

      void premixerCall(int16 * buf, uint len);
};

} // End of namespace Agi

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