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/*
* Adplug - Replayer for many OPL2/OPL3 audio file formats.
* Copyright (C) 1999 - 2002 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
*
* sng.cpp - SNG Player by Simon Peter <dn.tlp@gmx.net>
*/
#include <cstring>
#include "sng.h"
CPlayer *CsngPlayer::factory(Copl *newopl)
{
return new CsngPlayer(newopl);
}
bool CsngPlayer::load(const std::string &filename, const CFileProvider &fp)
{
binistream *f = fp.open(filename); if(!f) return false;
int i;
// load header
f->readString(header.id, 4);
header.length = f->readInt(2); header.start = f->readInt(2);
header.loop = f->readInt(2); header.delay = f->readInt(1);
header.compressed = f->readInt(1) ? true : false;
// file validation section
if(strncmp(header.id,"ObsM",4)) { fp.close(f); return false; }
// load section
header.length /= 2; header.start /= 2; header.loop /= 2;
data = new Sdata [header.length];
for(i = 0; i < header.length; i++) {
data[i].val = f->readInt(1);
data[i].reg = f->readInt(1);
}
rewind(0);
fp.close(f);
return true;
}
bool CsngPlayer::update()
{
if(header.compressed && del) {
del--;
return !songend;
}
while(data[pos].reg) {
opl->write(data[pos].reg, data[pos].val);
pos++;
if(pos >= header.length) {
songend = true;
pos = header.loop;
}
}
if(!header.compressed)
opl->write(data[pos].reg, data[pos].val);
if(data[pos].val) { del = data[pos].val - 1; pos++; }
if(pos >= header.length) { songend = true; pos = header.loop; }
return !songend;
}
void CsngPlayer::rewind(int subsong)
{
pos = header.start; del = header.delay; songend = false;
opl->init(); opl->write(1,32); // go to OPL2 mode
}
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