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a2m.h

/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2002 Simon Peter, <dn.tlp@gmx.net>, et al.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * a2m.h - A2M Loader by Simon Peter <dn.tlp@gmx.net>
 */

#include "protrack.h"

class Ca2mLoader: public CmodPlayer
{
public:
  static CPlayer *factory(Copl *newopl);

      Ca2mLoader(Copl *newopl)
            : CmodPlayer(newopl)
      { };

      bool load(const std::string &filename, const CFileProvider &fp);
      float getrefresh();

      std::string gettype()
      { return std::string("AdLib Tracker 2"); };
      std::string gettitle()
      { if(*songname) return std::string(songname,1,*songname); else return std::string(); };
      std::string getauthor()
      { if(*author) return std::string(author,1,*author); else return std::string(); };
      unsigned int getinstruments()
      { return 250; };
      std::string getinstrument(unsigned int n)
      { return std::string(instname[n],1,*instname[n]); };

private:

#define ADPLUG_A2M_COPYRANGES       6
#define ADPLUG_A2M_FIRSTCODE        257
#define ADPLUG_A2M_MINCOPY                3
#define ADPLUG_A2M_MAXCOPY                255
#define ADPLUG_A2M_CODESPERRANGE    (ADPLUG_A2M_MAXCOPY - ADPLUG_A2M_MINCOPY + 1)
#define ADPLUG_A2M_MAXCHAR                (ADPLUG_A2M_FIRSTCODE + \
      ADPLUG_A2M_COPYRANGES * ADPLUG_A2M_CODESPERRANGE - 1)
#define ADPLUG_A2M_TWICEMAX               (2 * ADPLUG_A2M_MAXCHAR + 1)

      static const unsigned int MAXFREQ, MINCOPY, MAXCOPY, COPYRANGES,
            CODESPERRANGE, TERMINATE, FIRSTCODE, MAXCHAR, SUCCMAX, TWICEMAX, ROOT,
            MAXBUF, MAXDISTANCE, MAXSIZE;

      static const unsigned short bitvalue[14];
      static const signed short copybits[ADPLUG_A2M_COPYRANGES],
            copymin[ADPLUG_A2M_COPYRANGES];

      void inittree();
      void updatefreq(unsigned short a,unsigned short b);
      void updatemodel(unsigned short code);
      unsigned short inputcode(unsigned short bits);
      unsigned short uncompress();
      void decode();
      unsigned short sixdepak(unsigned short *source,unsigned char *dest,unsigned short size);

      char songname[43], author[43], instname[250][33];

      unsigned short ibitcount, ibitbuffer, ibufcount, obufcount, input_size,
            output_size, leftc[ADPLUG_A2M_MAXCHAR+1], rghtc[ADPLUG_A2M_MAXCHAR+1],
            dad[ADPLUG_A2M_TWICEMAX+1], freq[ADPLUG_A2M_TWICEMAX+1], *wdbuf;
      unsigned char *obuf, *buf;
};

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