musix 0.3.3

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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/*
 * Adplug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2003 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * dfm.cpp - Digital-FM Loader by Simon Peter <dn.tlp@gmx.net>
 */

#include <stdio.h>
#include <string.h>

#include "dfm.h"
#include "debug.h"

CPlayer *CdfmLoader::factory(Copl *newopl)
{
  return new CdfmLoader(newopl);
}

bool CdfmLoader::load(const std::string &filename, const CFileProvider &fp)
{
  binistream *f = fp.open(filename); if(!f) return false;
  unsigned char		npats,n,note,fx,c,r,param;
  unsigned int		i;
  const unsigned char	convfx[8] = {255,255,17,19,23,24,255,13};

  // file validation
  f->readString(header.id, 4);
  header.hiver = f->readInt(1); header.lover = f->readInt(1);
  if(strncmp(header.id,"DFM\x1a",4) || header.hiver > 1)
    { fp.close(f); return false; }

  // load
  restartpos = 0; flags = Standard; bpm = 0;
  init_trackord();
  f->readString(songinfo, 33);
  initspeed = f->readInt(1);
  for(i = 0; i < 32; i++)
    f->readString(instname[i], 12);
  for(i = 0; i < 32; i++) {
    inst[i].data[1] = f->readInt(1);
    inst[i].data[2] = f->readInt(1);
    inst[i].data[9] = f->readInt(1);
    inst[i].data[10] = f->readInt(1);
    inst[i].data[3] = f->readInt(1);
    inst[i].data[4] = f->readInt(1);
    inst[i].data[5] = f->readInt(1);
    inst[i].data[6] = f->readInt(1);
    inst[i].data[7] = f->readInt(1);
    inst[i].data[8] = f->readInt(1);
    inst[i].data[0] = f->readInt(1);
  }
  for(i = 0; i < 128; i++) order[i] = f->readInt(1);
  for(i = 0; i < 128 && order[i] != 128; i++)
    ;
  length = i;
  npats = f->readInt(1);
  for(i = 0; i < npats; i++) {
    n = f->readInt(1);
    for(r = 0; r < 64; r++)
      for(c = 0; c < 9; c++) {
	note = f->readInt(1);
	if((note & 15) == 15)
	  tracks[n*9+c][r].note = 127;	// key off
	else
	  tracks[n*9+c][r].note = ((note & 127) >> 4) * 12 + (note & 15);
	if(note & 128) {	// additional effect byte
	  fx = f->readInt(1);
	  if(fx >> 5 == 1)
	    tracks[n*9+c][r].inst = (fx & 31) + 1;
	  else {
	    tracks[n*9+c][r].command = convfx[fx >> 5];
	    if(tracks[n*9+c][r].command == 17) {	// set volume
	      param = fx & 31;
	      param = 63 - param * 2;
	      tracks[n*9+c][r].param1 = param >> 4;
	      tracks[n*9+c][r].param2 = param & 15;
	    } else {
	      tracks[n*9+c][r].param1 = (fx & 31) >> 4;
	      tracks[n*9+c][r].param2 = fx & 15;
	    }
	  }
	}

      }
  }

  fp.close(f);
  rewind(0);
  return true;
}

std::string CdfmLoader::gettype()
{
	char tmpstr[20];

	sprintf(tmpstr,"Digital-FM %d.%d",header.hiver,header.lover);
	return std::string(tmpstr);
}

float CdfmLoader::getrefresh()
{
	return 125.0f;
}