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diskopl.cpp

/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999, 2000, 2001 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
 *
 *
 * diskopl.cpp - Disk Writer OPL, by Simon Peter <dn.tlp@gmx.net>
 */

#include "diskopl.h"

static const unsigned short note_table[12] = {363,385,408,432,458,485,514,544,577,611,647,686};
static const unsigned char op_table[9] = {0x00, 0x01, 0x02, 0x08, 0x09, 0x0a, 0x10, 0x11, 0x12};

CDiskopl::CDiskopl(std::string filename): old_freq(0.0f), del(1), nowrite(false)
{
      unsigned short clock = 0xffff;
      f = fopen(filename.c_str(),"wb");
      fwrite("RAWADATA",8,1,f);
      fwrite(&clock,sizeof(clock),1,f);
}

CDiskopl::~CDiskopl()
{
      fclose(f);
}

void CDiskopl::update(CPlayer *p)
{
      unsigned short    clock;
      unsigned int      wait;

      if(p->getrefresh() != old_freq) {
            old_freq = p->getrefresh();
            del = wait = (unsigned int)(18.2f / old_freq);
            clock = (unsigned short)(1192737/(old_freq*(wait+1)));
            fputc(0,f); fputc(2,f);
            fwrite(&clock,2,1,f);
      }
      if(!nowrite) {
            fputc(del+1,f);
            fputc(0,f);
      }
}

void CDiskopl::write(int reg, int val)
{
      if(!nowrite)
            diskwrite(reg,val);
}

void CDiskopl::init()
{
      for (int i=0;i<9;i++) {                   // stop instruments
            diskwrite(0xb0 + i,0);                    // key off
            diskwrite(0x80 + op_table[i],0xff); // fastest release
      }
      diskwrite(0xbd,0);      // clear misc. register
}

void CDiskopl::diskwrite(int reg, int val)
{
      fputc(val,f);
      fputc(reg,f);
}

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