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/*
* Adplug - Replayer for many OPL2/OPL3 audio file formats.
* Copyright (C) 1999 - 2005 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
*
* raw.c - RAW Player by Simon Peter <dn.tlp@gmx.net>
*/
#include <cstring>
#include "raw.h"
/*** public methods *************************************/
CPlayer *CrawPlayer::factory(Copl *newopl)
{
return new CrawPlayer(newopl);
}
bool CrawPlayer::load(const std::string &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,"RAWADATA",8)) { fp.close (f); return false; }
// load section
clock = f->readInt(2); // clock speed
length = (fp.filesize(f) - 10) / 2;
data = new Tdata [length];
for(i = 0; i < length; i++) {
data[i].param = f->readInt(1);
data[i].command = f->readInt(1);
}
fp.close(f);
rewind(0);
return true;
}
bool CrawPlayer::update()
{
bool setspeed;
if(pos >= length) return false;
if(del) {
del--;
return !songend;
}
do {
setspeed = false;
switch(data[pos].command) {
case 0: del = data[pos].param - 1; break;
case 2:
if(!data[pos].param) {
pos++;
speed = data[pos].param + (data[pos].command << 8);
setspeed = true;
} else
opl->setchip(data[pos].param - 1);
break;
case 0xff:
if(data[pos].param == 0xff) {
rewind(0); // auto-rewind song
songend = true;
return !songend;
}
break;
default:
opl->write(data[pos].command,data[pos].param);
break;
}
} while(data[pos++].command || setspeed);
return !songend;
}
void CrawPlayer::rewind(int subsong)
{
pos = del = 0; speed = clock; songend = false;
opl->init(); opl->write(1, 32); // go to 9 channel mode
}
float CrawPlayer::getrefresh()
{
return 1193180.0 / (speed ? speed : 0xffff); // timer oscillator speed / wait register = clock frequency
}
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