/* * Adplug - Replayer for many OPL2/OPL3 audio file formats. * Copyright (C) 1999 - 2007 Simon Peter, , 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 * * a2m.cpp - A2M Loader by Simon Peter * * NOTES: * This loader detects and loads version 1, 4, 5 & 8 files. * * version 1-4 files: * Following commands are ignored: FF1 - FF9, FAx - FEx * * version 5-8 files: * Instrument panning is ignored. Flags byte is ignored. * Following commands are ignored: Gxy, Hxy, Kxy - &xy */ #include #include "a2m.h" const unsigned int Ca2mLoader::MAXFREQ = 2000, Ca2mLoader::MINCOPY = ADPLUG_A2M_MINCOPY, Ca2mLoader::MAXCOPY = ADPLUG_A2M_MAXCOPY, Ca2mLoader::COPYRANGES = ADPLUG_A2M_COPYRANGES, Ca2mLoader::CODESPERRANGE = ADPLUG_A2M_CODESPERRANGE, Ca2mLoader::TERMINATE = 256, Ca2mLoader::FIRSTCODE = ADPLUG_A2M_FIRSTCODE, Ca2mLoader::MAXCHAR = FIRSTCODE + COPYRANGES * CODESPERRANGE - 1, Ca2mLoader::SUCCMAX = MAXCHAR + 1, Ca2mLoader::TWICEMAX = ADPLUG_A2M_TWICEMAX, Ca2mLoader::ROOT = 1, Ca2mLoader::MAXBUF = 42 * 1024, Ca2mLoader::MAXDISTANCE = 21389, Ca2mLoader::MAXSIZE = 21389 + MAXCOPY; const unsigned short Ca2mLoader::bitvalue[14] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192}; const signed short Ca2mLoader::copybits[COPYRANGES] = {4, 6, 8, 10, 12, 14}; const signed short Ca2mLoader::copymin[COPYRANGES] = {0, 16, 80, 336, 1360, 5456}; CPlayer *Ca2mLoader::factory(Copl *newopl) { return new Ca2mLoader(newopl); } bool Ca2mLoader::load(const char *filename, const CFileProvider &fp) { binistream *f = fp.open(filename); if(!f) return false; char id[10]; int i,j,k,t; unsigned int l; unsigned char *org = 0, *orgptr, flags = 0, numpats, version; unsigned long crc, alength; unsigned short len[9], *secdata, *secptr; const unsigned char convfx[16] = {0,1,2,23,24,3,5,4,6,9,17,13,11,19,7,14}; const unsigned char convinf1[16] = {0,1,2,6,7,8,9,4,5,3,10,11,12,13,14,15}; const unsigned char newconvfx[] = {0,1,2,3,4,5,6,23,24,21,10,11,17,13,7,19, 255,255,22,25,255,15,255,255,255,255,255, 255,255,255,255,255,255,255,255,14,255}; // read header f->readString(id, 10); crc = f->readInt(4); version = f->readInt(1); numpats = f->readInt(1); // file validation section if(strncmp(id,"_A2module_",10) || (version != 1 && version != 5 && version != 4 && version != 8)) { fp.close(f); return false; } // load, depack & convert section nop = numpats; length = 128; restartpos = 0; if(version < 5) { for(i=0;i<5;i++) len[i] = f->readInt(2); t = 9; } else { // version >= 5 for(i=0;i<9;i++) len[i] = f->readInt(2); t = 18; } // block 0 secdata = new unsigned short [len[0] / 2]; if(version == 1 || version == 5) { for(i=0;ireadInt(2); org = new unsigned char [MAXBUF]; orgptr = org; sixdepak(secdata,org,len[0]); } else { orgptr = (unsigned char *)secdata; for(i=0;ireadInt(1); } memcpy(songname,orgptr,43); orgptr += 43; memcpy(author,orgptr,43); orgptr += 43; memcpy(instname,orgptr,250*33); orgptr += 250*33; for(i=0;i<250;i++) { // instruments inst[i].data[0] = *(orgptr+i*13+10); inst[i].data[1] = *(orgptr+i*13); inst[i].data[2] = *(orgptr+i*13+1); inst[i].data[3] = *(orgptr+i*13+4); inst[i].data[4] = *(orgptr+i*13+5); inst[i].data[5] = *(orgptr+i*13+6); inst[i].data[6] = *(orgptr+i*13+7); inst[i].data[7] = *(orgptr+i*13+8); inst[i].data[8] = *(orgptr+i*13+9); inst[i].data[9] = *(orgptr+i*13+2); inst[i].data[10] = *(orgptr+i*13+3); if(version < 5) inst[i].misc = *(orgptr+i*13+11); else { // version >= 5 -> OPL3 format int pan = *(orgptr+i*13+11); if(pan) inst[i].data[0] |= (pan & 3) << 4; // set pan else inst[i].data[0] |= 48; // enable both speakers } inst[i].slide = *(orgptr+i*13+12); } orgptr += 250*13; memcpy(order,orgptr,128); orgptr += 128; bpm = *orgptr; orgptr++; initspeed = *orgptr; orgptr++; if(version >= 5) flags = *orgptr; if(version == 1 || version == 5) delete [] org; delete [] secdata; // blocks 1-4 or 1-8 alength = len[1]; for(i = 0; i < (version < 5 ? numpats / 16 : numpats / 8); i++) alength += len[i+2]; secdata = new unsigned short [alength / 2]; if(version == 1 || version == 5) { for(l=0;lreadInt(2); org = new unsigned char [MAXBUF * (numpats / (version == 1 ? 16 : 8) + 1)]; orgptr = org; secptr = secdata; orgptr += sixdepak(secptr,orgptr,len[1]); secptr += len[1] / 2; if(version == 1) { if(numpats > 16) orgptr += sixdepak(secptr,orgptr,len[2]); secptr += len[2] / 2; if(numpats > 32) orgptr += sixdepak(secptr,orgptr,len[3]); secptr += len[3] / 2; if(numpats > 48) sixdepak(secptr,orgptr,len[4]); } else { if(numpats > 8) orgptr += sixdepak(secptr,orgptr,len[2]); secptr += len[2] / 2; if(numpats > 16) orgptr += sixdepak(secptr,orgptr,len[3]); secptr += len[3] / 2; if(numpats > 24) orgptr += sixdepak(secptr,orgptr,len[4]); secptr += len[4] / 2; if(numpats > 32) orgptr += sixdepak(secptr,orgptr,len[5]); secptr += len[5] / 2; if(numpats > 40) orgptr += sixdepak(secptr,orgptr,len[6]); secptr += len[6] / 2; if(numpats > 48) orgptr += sixdepak(secptr,orgptr,len[7]); secptr += len[7] / 2; if(numpats > 56) sixdepak(secptr,orgptr,len[8]); } delete [] secdata; } else { org = (unsigned char *)secdata; for(l=0;lreadInt(1); } if(version < 5) { for(i=0;inote = o[0] == 255 ? 127 : o[0]; track->inst = o[1]; track->command = convfx[o[2]]; track->param2 = o[3] & 0x0f; if(track->command != 14) track->param1 = o[3] >> 4; else { track->param1 = convinf1[o[3] >> 4]; if(track->param1 == 15 && !track->param2) { // convert key-off track->command = 8; track->param1 = 0; track->param2 = 0; } } if(track->command == 14) { switch(track->param1) { case 2: // convert define waveform track->command = 25; track->param1 = track->param2; track->param2 = 0xf; break; case 8: // convert volume slide up track->command = 26; track->param1 = track->param2; track->param2 = 0; break; case 9: // convert volume slide down track->command = 26; track->param1 = 0; break; } } } } else { // version >= 5 realloc_patterns(64, 64, 18); for(i=0;inote = o[0] == 255 ? 127 : o[0]; track->inst = o[1]; track->command = newconvfx[o[2]]; track->param1 = o[3] >> 4; track->param2 = o[3] & 0x0f; // Convert '&' command if(o[2] == 36) switch(track->param1) { case 0: // pattern delay (frames) track->command = 29; track->param1 = 0; // param2 already set correctly break; case 1: // pattern delay (rows) track->command = 14; track->param1 = 8; // param2 already set correctly break; } } } init_trackord(); if(version == 1 || version == 5) delete [] org; else delete [] secdata; // Process flags if(version >= 5) { CmodPlayer::flags |= Opl3; // All versions >= 5 are OPL3 if(flags & 8) CmodPlayer::flags |= Tremolo; // Tremolo depth if(flags & 16) CmodPlayer::flags |= Vibrato; // Vibrato depth } fp.close(f); rewind(0); return true; } float Ca2mLoader::getrefresh() { if(tempo != 18) return (float) (tempo); else return 18.2f; } /*** private methods *************************************/ void Ca2mLoader::inittree() { unsigned short i; for(i=2;i<=TWICEMAX;i++) { dad[i] = i / 2; freq[i] = 1; } for(i=1;i<=MAXCHAR;i++) { leftc[i] = 2 * i; rghtc[i] = 2 * i + 1; } } void Ca2mLoader::updatefreq(unsigned short a,unsigned short b) { do { freq[dad[a]] = freq[a] + freq[b]; a = dad[a]; if(a != ROOT) if(leftc[dad[a]] == a) b = rghtc[dad[a]]; else b = leftc[dad[a]]; } while(a != ROOT); if(freq[ROOT] == MAXFREQ) for(a=1;a<=TWICEMAX;a++) freq[a] >>= 1; } void Ca2mLoader::updatemodel(unsigned short code) { unsigned short a=code+SUCCMAX,b,c,code1,code2; freq[a]++; if(dad[a] != ROOT) { code1 = dad[a]; if(leftc[code1] == a) updatefreq(a,rghtc[code1]); else updatefreq(a,leftc[code1]); do { code2 = dad[code1]; if(leftc[code2] == code1) b = rghtc[code2]; else b = leftc[code2]; if(freq[a] > freq[b]) { if(leftc[code2] == code1) rghtc[code2] = a; else leftc[code2] = a; if(leftc[code1] == a) { leftc[code1] = b; c = rghtc[code1]; } else { rghtc[code1] = b; c = leftc[code1]; } dad[b] = code1; dad[a] = code2; updatefreq(b,c); a = b; } a = dad[a]; code1 = dad[a]; } while(code1 != ROOT); } } unsigned short Ca2mLoader::inputcode(unsigned short bits) { unsigned short i,code=0; for(i=1;i<=bits;i++) { if(!ibitcount) { if(ibitcount == MAXBUF) ibufcount = 0; ibitbuffer = wdbuf[ibufcount]; ibufcount++; ibitcount = 15; } else ibitcount--; if(ibitbuffer > 0x7fff) code |= bitvalue[i-1]; ibitbuffer <<= 1; } return code; } unsigned short Ca2mLoader::uncompress() { unsigned short a=1; do { if(!ibitcount) { if(ibufcount == MAXBUF) ibufcount = 0; ibitbuffer = wdbuf[ibufcount]; ibufcount++; ibitcount = 15; } else ibitcount--; if(ibitbuffer > 0x7fff) a = rghtc[a]; else a = leftc[a]; ibitbuffer <<= 1; } while(a <= MAXCHAR); a -= SUCCMAX; updatemodel(a); return a; } void Ca2mLoader::decode() { unsigned short i,j,k,t,c,count=0,dist,len,index; inittree(); c = uncompress(); while(c != TERMINATE) { if(c < 256) { obuf[obufcount] = (unsigned char)c; obufcount++; if(obufcount == MAXBUF) { output_size = MAXBUF; obufcount = 0; } buf[count] = (unsigned char)c; count++; if(count == MAXSIZE) count = 0; } else { t = c - FIRSTCODE; index = t / CODESPERRANGE; len = t + MINCOPY - index * CODESPERRANGE; dist = inputcode(copybits[index]) + len + copymin[index]; j = count; k = count - dist; if(count < dist) k += MAXSIZE; for(i=0;i<=len-1;i++) { obuf[obufcount] = buf[k]; obufcount++; if(obufcount == MAXBUF) { output_size = MAXBUF; obufcount = 0; } buf[j] = buf[k]; j++; k++; if(j == MAXSIZE) j = 0; if(k == MAXSIZE) k = 0; } count += len; if(count >= MAXSIZE) count -= MAXSIZE; } c = uncompress(); } output_size = obufcount; } unsigned short Ca2mLoader::sixdepak(unsigned short *source, unsigned char *dest, unsigned short size) { if((unsigned int)size + 4096 > MAXBUF) return 0; buf = new unsigned char [MAXSIZE]; input_size = size; ibitcount = 0; ibitbuffer = 0; obufcount = 0; ibufcount = 0; wdbuf = source; obuf = dest; decode(); delete [] buf; return output_size; }