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sound.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-1-2-0/engines/agi/sound.h $
 * $Id: sound.h 49757 2010-06-15 10:36:54Z sev $
 *
 */

#ifndef AGI_SOUND_H
#define AGI_SOUND_H

#include "sound/mixer.h"

namespace Agi {

#define SOUND_EMU_NONE  0
#define SOUND_EMU_PC    1
#define SOUND_EMU_PCJR  2
#define SOUND_EMU_MAC   3
#define SOUND_EMU_AMIGA 4
#define SOUND_EMU_APPLE2GS 5
#define SOUND_EMU_COCO3 6
#define SOUND_EMU_MIDI 7

/**
 * AGI sound note structure.
 */
00045 struct AgiNote {
00046       uint16 duration;    ///< Note duration
00047       uint16 freqDiv;     ///< Note frequency divisor (10-bit)
00048       uint8  attenuation; ///< Note volume attenuation (4-bit)

      /** Reads an AgiNote through the given pointer. */
00051       void read(const uint8 *ptr) {
            duration = READ_LE_UINT16(ptr);
            uint16 freqByte0 = *(ptr + 2); // Bits 4-9 of the frequency divisor
            uint16 freqByte1 = *(ptr + 3); // Bits 0-3 of the frequency divisor
            // Merge the frequency divisor's bits together into a single variable
            freqDiv = ((freqByte0 & 0x3F) << 4) | (freqByte1 & 0x0F);
            attenuation = *(ptr + 4) & 0x0F;
      }
};

/**
 * AGI sound resource types.
 * It's probably coincidence that all the values here are powers of two
 * as they're simply the different used values in AGI sound resources'
 * starts (The first 16-bit little endian word, to be precise).
 */
00067 enum AgiSoundEmuType {
      AGI_SOUND_SAMPLE  = 0x0001,
      AGI_SOUND_MIDI          = 0x0002,
      AGI_SOUND_4CHN          = 0x0008
};

class SoundMgr;

class SoundGen {
public:
      SoundGen(AgiEngine *vm, Audio::Mixer *pMixer) : _vm(vm), _mixer(pMixer) {
            _sampleRate = pMixer->getOutputRate();
      }

      virtual ~SoundGen() {}

      virtual void play(int resnum) = 0;
      virtual void stop(void) = 0;

      AgiEngine *_vm;

      Audio::Mixer *_mixer;
      Audio::SoundHandle _soundHandle;

      uint32 _sampleRate;
};

/**
 * AGI sound resource structure.
 */
00097 class AgiSound {
public:
      AgiSound(SoundMgr &manager) : _manager(manager), _isPlaying(false), _isValid(false) {}
      virtual ~AgiSound() {}
      virtual void play()      { _isPlaying = true; }
      virtual void stop()      { _isPlaying = false; }
      virtual bool isPlaying() { return _isPlaying; }
      virtual uint16 type() = 0;

      /**
       * A named constructor for creating different types of AgiSound objects
       * from a raw sound resource.
       *
       * NOTE: This function should take responsibility for freeing the raw resource
       * from memory using free() or delegate the responsibility onwards to some other
       * function!
       */
      static AgiSound *createFromRawResource(uint8 *data, uint32 len, int resnum, SoundMgr &manager, int soundemu);

protected:
00117       SoundMgr &_manager; ///< AGI sound manager object
00118       bool _isPlaying;    ///< Is the sound playing?
00119       bool _isValid;      ///< Is this a valid sound object?
};

class PCjrSound : public AgiSound {
public:
      PCjrSound(uint8 *data, uint32 len, int resnum, SoundMgr &manager);
      ~PCjrSound() { free(_data); }
      virtual uint16 type() { return _type; }
      const uint8 *getVoicePointer(uint voiceNum);
protected:
      uint8 *_data; ///< Raw sound resource data
      uint32 _len;  ///< Length of the raw sound resource
      uint16 _type; ///< Sound resource type
};

class SoundMgr {

public:
      SoundMgr(AgiEngine *agi, Audio::Mixer *pMixer);
      ~SoundMgr();

      void setVolume(uint8 volume);

      void unloadSound(int);
      void playSound();
      int initSound();
      void deinitSound();
      void startSound(int, int);
      void stopSound();

      void soundIsFinished();

private:
      int _endflag;
      AgiEngine *_vm;

      SoundGen *_soundGen;

      int _playingSound;
};

} // End of namespace Agi

#endif /* AGI_SOUND_H */

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