diff options
Diffstat (limited to 'plugins/adplug/adplug/dro.cpp')
-rw-r--r-- | plugins/adplug/adplug/dro.cpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/plugins/adplug/adplug/dro.cpp b/plugins/adplug/adplug/dro.cpp new file mode 100644 index 00000000..eb97c0f8 --- /dev/null +++ b/plugins/adplug/adplug/dro.cpp @@ -0,0 +1,130 @@ +/* + * 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 + * + * 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 <stdio.h> +#include <string.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 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,"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(1); // 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; +} |