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-rw-r--r--plugins/adplug/adplug/a2m.cpp483
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diff --git a/plugins/adplug/adplug/a2m.cpp b/plugins/adplug/adplug/a2m.cpp
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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
+ *
+ * a2m.cpp - A2M Loader by Simon Peter <dn.tlp@gmx.net>
+ *
+ * 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 <string.h>
+#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 std::string &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, *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;i<len[0]/2;i++) secdata[i] = f->readInt(2);
+ org = new unsigned char [MAXBUF]; orgptr = org;
+ sixdepak(secdata,org,len[0]);
+ } else {
+ orgptr = (unsigned char *)secdata;
+ for(i=0;i<len[0];i++) orgptr[i] = f->readInt(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;l<alength/2;l++) secdata[l] = f->readInt(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;l<alength;l++) org[l] = f->readInt(1);
+ }
+
+ if(version < 5) {
+ for(i=0;i<numpats;i++)
+ for(j=0;j<64;j++)
+ for(k=0;k<9;k++) {
+ struct Tracks *track = &tracks[i * 9 + k][j];
+ unsigned char *o = &org[i*64*t*4+j*t*4+k*4];
+
+ track->note = 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;i<numpats;i++)
+ for(j=0;j<18;j++)
+ for(k=0;k<64;k++) {
+ struct Tracks *track = &tracks[i * 18 + j][k];
+ unsigned char *o = &org[i*64*t*4+j*64*4+k*4];
+
+ track->note = 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;
+}
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