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/*
* Adplug - Replayer for many OPL2/OPL3 audio file formats.
* Copyright (C) 1999 - 2007 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
*
* dro.c - DOSBox Raw OPL Player by Sjoerd van der Berg <harekiet@zophar.net>
*
* upgraded by matthew gambrell <zeromus@zeromus.org>
*
* NOTES: 3-oct-04: the DRO format is not yet finalized. beware.
*/
#include <string.h>
#include <stdio.h>
#include "dro.h"
/*** public methods *************************************/
CPlayer *CdroPlayer::factory(Copl *newopl)
{
return new CdroPlayer(newopl);
}
CdroPlayer::CdroPlayer(Copl *newopl)
: CPlayer(newopl), data(0)
{
if(opl->gettype() == Copl::TYPE_OPL2)
opl3_mode = 0;
else
opl3_mode = 1;
}
bool CdroPlayer::load(const char *filename, const CFileProvider &fp)
{
binistream *f = fp.open(filename); if(!f) return false;
char id[8];
unsigned long i;
// file validation section
f->readString(id, 8);
if(strncmp(id,"DBRAWOPL",8)) { fp.close (f); return false; }
int version = f->readInt(4); // not very useful just yet
if(version != 0x10000) { fp.close(f); return false; }
// load section
mstotal = f->readInt(4); // Total milliseconds in file
length = f->readInt(4); // Total data bytes in file
f->ignore(4); // Type of opl data this can contain - ignored
data = new unsigned char [length];
for (i=0;i<length;i++)
data[i]=f->readInt(1);
fp.close(f);
rewind(0);
return true;
}
bool CdroPlayer::update()
{
if (delay>500) {
delay-=500;
return true;
} else
delay=0;
while (pos < length) {
unsigned char cmd = data[pos++];
switch(cmd) {
case 0:
delay = 1 + data[pos++];
return true;
case 1:
delay = 1 + data[pos] + (data[pos+1]<<8);
pos+=2;
return true;
case 2:
index = 0;
opl->setchip(0);
break;
case 3:
index = 1;
opl->setchip(1);
break;
default:
if(cmd==4) cmd = data[pos++]; //data override
if(index == 0 || opl3_mode)
opl->write(cmd,data[pos++]);
break;
}
}
return pos<length;
}
void CdroPlayer::rewind(int subsong)
{
delay=1;
pos = index = 0;
opl->init();
//dro assumes all registers are initialized to 0
//registers not initialized to 0 will be corrected
//in the data stream
for(int i=0;i<256;i++)
opl->write(i,0);
opl->setchip(1);
for(int i=0;i<256;i++)
opl->write(i,0);
opl->setchip(0);
}
float CdroPlayer::getrefresh()
{
if (delay > 500) return 1000 / 500;
else return 1000 / (double)delay;
}
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