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infogrames.h

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/* 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.
 *
 * $URL$
 * $Id$
 *
 */

/**
 * @file
 * Sound decoder used in engines:
 *  - gob
 */

#ifndef SOUND_MODS_INFOGRAMES_H
#define SOUND_MODS_INFOGRAMES_H

#include "audio/mods/paula.h"

namespace Common {
class SeekableReadStream;
}

namespace Audio {

/** A player for the Infogrames/RobHubbard2 format */
00044 class Infogrames : public Paula {
public:
00046       class Instruments {
      public:
            Instruments();
            template<typename T> Instruments(T ins) {
                  init();
                  bool result = load(ins);
                  assert(result);
            }
            ~Instruments();

            bool load(Common::SeekableReadStream &ins);
            bool load(const char *ins);
            void unload();

            uint8 getCount() const { return _count; }

      protected:
00063             struct Sample {
                  int8 *data;
                  int8 *dataRepeat;
                  uint32 length;
                  uint32 lengthRepeat;
            } _samples[32];

            uint8 _count;
            int8 *_sampleData;

            void init();

            friend class Infogrames;
      };

      Infogrames(Instruments &ins, bool stereo = false, int rate = 44100,
                  int interruptFreq = 0);
      ~Infogrames();

      Instruments *getInstruments() const { return _instruments; }
      bool getRepeating() const { return _repCount != 0; }
      void setRepeating (int32 repCount) { _repCount = repCount; }

      bool load(Common::SeekableReadStream &dum);
      bool load(const char *dum);
      void unload();
      void restart() {
            if (_data) {
                  // Use the mutex here to ensure we do not call init()
                  // while data is being read by the mixer thread.
                  _mutex.lock();
                  init();
                  startPlay();
                  _mutex.unlock();
            }
      }

protected:
      Instruments *_instruments;

      static const uint8 tickCount[];
      static const uint16 periods[];
      byte *_data;
      int32 _repCount;

      byte *_subSong;
      byte *_cmdBlocks;
      byte *_volSlideBlocks;
      byte *_periodSlideBlocks;
      uint8 _speedCounter;
      uint8 _speed;

      uint16 _volume;
      int16 _period;
      uint8 _sample;

00119       struct Slide {
            byte *data;
            int8 amount;
            uint8 dataOffset;
            int16 finetuneNeg;
            int16 finetunePos;
            uint8 curDelay1;
            uint8 curDelay2;
            uint8 flags; // 0: Apply finetune modifier, 2: Don't slide, 7: Continuous
      };
00129       struct Channel {
            byte *cmdBlockIndices;
            byte *cmdBlocks;
            byte *cmds;
            uint8 ticks;
            uint8 tickCount;
            Slide volSlide;
            Slide periodSlide;
            int16 period;
            int8 periodMod;
            uint8 flags; // 0: Need init, 5: Loop cmdBlocks, 6: Ignore channel
      } _chn[4];

      void init();
      void reset();
      void getNextSample(Channel &chn);
      int16 tune(Slide &slide, int16 start) const;
      virtual void interrupt();
};

} // End of namespace Audio

#endif

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