LMMS/plugins/opl2/temuopl.cpp

/*
 * AdPlug - Replayer for many OPL2/OPL3 audio file formats.
 * Copyright (C) 1999 - 2004 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
 *
 * temuopl.cpp - Tatsuyuki Satoh's OPL2 emulator, by Simon Peter <dn.tlp@gmx.net>
 */

#include "temuopl.h"

CTemuopl::CTemuopl(int rate, bool bit16, bool usestereo)
  : use16bit(bit16), stereo(usestereo)
{
  opl = OPLCreate(OPL_TYPE_YM3812, 3579545, rate);
}

CTemuopl::~CTemuopl()
{
  OPLDestroy(opl);
}

void CTemuopl::update(short *buf, int samples)
{
  int i;

  if(use16bit) {
    YM3812UpdateOne(opl,buf,samples);

    if(stereo)
      for(i=samples-1;i>=0;i--) {
	buf[i*2] = buf[i];
	buf[i*2+1] = buf[i];
      }
  } else {
    short *tempbuf = new short[stereo ? samples*2 : samples];
    int i;

    YM3812UpdateOne(opl,tempbuf,samples);

    if(stereo)
      for(i=samples-1;i>=0;i--) {
	tempbuf[i*2] = tempbuf[i];
	tempbuf[i*2+1] = tempbuf[i];
      }

    for(i=0;i<(stereo ? samples*2 : samples);i++)
      ((char *)buf)[i] = (tempbuf[i] >> 8) ^ 0x80;

    delete [] tempbuf;
  }
}

void CTemuopl::write(int reg, int val)
{
  OPLWrite(opl,0,reg);
  OPLWrite(opl,1,val);
}

void CTemuopl::init()
{
  OPLResetChip(opl);
}