libpcsxcore/cdriso.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 PCSX-df Team                                       *
   3  *   Copyright (C) 2009 Wei Mingzhi                                        *
   4  *   Copyright (C) 2012 notaz                                              *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  20  ***************************************************************************/
  21
  22 #include "psxcommon.h"
  23 #include "plugins.h"
  24 #include "cdrom.h"
  25 #include "cdriso.h"
  26 #include "ppf.h"
  27
  28 #include <errno.h>
  29 #include <zlib.h>
  30 #ifdef HAVE_CHD
  31 #include <chd.h>
  32 #endif
  33
  34 #ifdef _WIN32
  35 #define WIN32_LEAN_AND_MEAN
  36 #include <process.h>
  37 #include <windows.h>
  38 #define strcasecmp _stricmp
  39 #define usleep(x) (Sleep((x) / 1000))
  40 #else
  41 #include <pthread.h>
  42 #include <sys/time.h>
  43 #include <unistd.h>
  44 #endif
  45
  46 #define OFF_T_MSB ((off_t)1 << (sizeof(off_t) * 8 - 1))
  47
  48 unsigned int cdrIsoMultidiskCount;
  49 unsigned int cdrIsoMultidiskSelect;
  50
  51 static FILE *cdHandle = NULL;
  52 static FILE *cddaHandle = NULL;
  53 static FILE *subHandle = NULL;
  54
  55 static boolean subChanMixed = FALSE;
  56 static boolean subChanRaw = FALSE;
  57 static boolean subChanMissing = FALSE;
  58
  59 static boolean multifile = FALSE;
  60
  61 static unsigned char cdbuffer[CD_FRAMESIZE_RAW];
  62 static unsigned char subbuffer[SUB_FRAMESIZE];
  63
  64 static unsigned char sndbuffer[CD_FRAMESIZE_RAW * 10];
  65
  66 #define CDDA_FRAMETIME                  (1000 * (sizeof(sndbuffer) / CD_FRAMESIZE_RAW) / 75)
  67
  68 #ifdef _WIN32
  69 static HANDLE threadid;
  70 #else
  71 static pthread_t threadid;
  72 #endif
  73 static unsigned int initial_offset = 0;
  74 static boolean playing = FALSE;
  75 static boolean cddaBigEndian = FALSE;
  76 // cdda sectors in toc, byte offset in file
  77 static unsigned int cdda_cur_sector;
  78 static unsigned int cdda_first_sector;
  79 static unsigned int cdda_file_offset;
  80 /* Frame offset into CD image where pregap data would be found if it was there.
  81  * If a game seeks there we must *not* return subchannel data since it's
  82  * not in the CD image, so that cdrom code can fake subchannel data instead.
  83  * XXX: there could be multiple pregaps but PSX dumps only have one? */
  84 static unsigned int pregapOffset;
  85
  86 #define cddaCurPos cdda_cur_sector
  87
  88 // compressed image stuff
  89 static struct {
  90         unsigned char buff_raw[16][CD_FRAMESIZE_RAW];
  91         unsigned char buff_compressed[CD_FRAMESIZE_RAW * 16 + 100];
  92         off_t *index_table;
  93         unsigned int index_len;
  94         unsigned int block_shift;
  95         unsigned int current_block;
  96         unsigned int sector_in_blk;
  97 } *compr_img;
  98
  99 #ifdef HAVE_CHD
 100 static struct {
 101         unsigned char (*buffer)[CD_FRAMESIZE_RAW + SUB_FRAMESIZE];
 102         chd_file* chd;
 103         const chd_header* header;
 104         unsigned int sectors_per_hunk;
 105         unsigned int current_hunk;
 106         unsigned int sector_in_hunk;
 107 } *chd_img;
 108 #endif
 109
 110 int (*cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
 111
 112 char* CALLBACK CDR__getDriveLetter(void);
 113 long CALLBACK CDR__configure(void);
 114 long CALLBACK CDR__test(void);
 115 void CALLBACK CDR__about(void);
 116 long CALLBACK CDR__setfilename(char *filename);
 117 long CALLBACK CDR__getStatus(struct CdrStat *stat);
 118
 119 static void DecodeRawSubData(void);
 120
 121 struct trackinfo {
 122         enum {DATA=1, CDDA} type;
 123         char start[3];          // MSF-format
 124         char length[3];         // MSF-format
 125         FILE *handle;           // for multi-track images CDDA
 126         unsigned int start_offset; // byte offset from start of above file
 127 };
 128
 129 #define MAXTRACKS 100 /* How many tracks can a CD hold? */
 130
 131 static int numtracks = 0;
 132 static struct trackinfo ti[MAXTRACKS];
 133
 134 // get a sector from a msf-array
 135 static unsigned int msf2sec(char *msf) {
 136         return ((msf[0] * 60 + msf[1]) * 75) + msf[2];
 137 }
 138
 139 static void sec2msf(unsigned int s, char *msf) {
 140         msf[0] = s / 75 / 60;
 141         s = s - msf[0] * 75 * 60;
 142         msf[1] = s / 75;
 143         s = s - msf[1] * 75;
 144         msf[2] = s;
 145 }
 146
 147 // divide a string of xx:yy:zz into m, s, f
 148 static void tok2msf(char *time, char *msf) {
 149         char *token;
 150
 151         token = strtok(time, ":");
 152         if (token) {
 153                 msf[0] = atoi(token);
 154         }
 155         else {
 156                 msf[0] = 0;
 157         }
 158
 159         token = strtok(NULL, ":");
 160         if (token) {
 161                 msf[1] = atoi(token);
 162         }
 163         else {
 164                 msf[1] = 0;
 165         }
 166
 167         token = strtok(NULL, ":");
 168         if (token) {
 169                 msf[2] = atoi(token);
 170         }
 171         else {
 172                 msf[2] = 0;
 173         }
 174 }
 175
 176 #ifndef _WIN32
 177 static long GetTickCount(void) {
 178         static time_t           initial_time = 0;
 179         struct timeval          now;
 180
 181         gettimeofday(&now, NULL);
 182
 183         if (initial_time == 0) {
 184                 initial_time = now.tv_sec;
 185         }
 186
 187         return (now.tv_sec - initial_time) * 1000L + now.tv_usec / 1000L;
 188 }
 189 #endif
 190
 191 // this thread plays audio data
 192 #ifdef _WIN32
 193 static void playthread(void *param)
 194 #else
 195 static void *playthread(void *param)
 196 #endif
 197 {
 198         long osleep, d, t, i, s;
 199         unsigned char   tmp;
 200         int ret = 0, sector_offs;
 201
 202         t = GetTickCount();
 203
 204         while (playing) {
 205                 s = 0;
 206                 for (i = 0; i < sizeof(sndbuffer) / CD_FRAMESIZE_RAW; i++) {
 207                         sector_offs = cdda_cur_sector - cdda_first_sector;
 208                         if (sector_offs < 0) {
 209                                 d = CD_FRAMESIZE_RAW;
 210                                 memset(sndbuffer + s, 0, d);
 211                         }
 212                         else {
 213                                 d = cdimg_read_func(cddaHandle, cdda_file_offset,
 214                                         sndbuffer + s, sector_offs);
 215                                 if (d < CD_FRAMESIZE_RAW)
 216                                         break;
 217                         }
 218
 219                         s += d;
 220                         cdda_cur_sector++;
 221                 }
 222
 223                 if (s == 0) {
 224                         playing = FALSE;
 225                         initial_offset = 0;
 226                         break;
 227                 }
 228
 229                 if (!cdr.Muted && playing) {
 230                         if (cddaBigEndian) {
 231                                 for (i = 0; i < s / 2; i++) {
 232                                         tmp = sndbuffer[i * 2];
 233                                         sndbuffer[i * 2] = sndbuffer[i * 2 + 1];
 234                                         sndbuffer[i * 2 + 1] = tmp;
 235                                 }
 236                         }
 237
 238                         // can't do it yet due to readahead..
 239                         //cdrAttenuate((short *)sndbuffer, s / 4, 1);
 240                         do {
 241                                 ret = SPU_playCDDAchannel((short *)sndbuffer, s);
 242                                 if (ret == 0x7761)
 243             {
 244                                         usleep(6 * 1000);
 245             }
 246                         } while (ret == 0x7761 && playing); // rearmed_wait
 247                 }
 248
 249                 if (ret != 0x676f) { // !rearmed_go
 250                         // do approx sleep
 251                         long now;
 252
 253                         // HACK: stop feeding data while emu is paused
 254                         extern int stop;
 255                         while (stop && playing)
 256          {
 257                                 usleep(10000);
 258          }
 259
 260                         now = GetTickCount();
 261                         osleep = t - now;
 262                         if (osleep <= 0) {
 263                                 osleep = 1;
 264                                 t = now;
 265                         }
 266                         else if (osleep > CDDA_FRAMETIME) {
 267                                 osleep = CDDA_FRAMETIME;
 268                                 t = now;
 269                         }
 270
 271                         usleep(osleep * 1000);
 272                         t += CDDA_FRAMETIME;
 273                 }
 274
 275         }
 276
 277 #ifdef _WIN32
 278         _endthread();
 279 #else
 280         pthread_exit(0);
 281         return NULL;
 282 #endif
 283 }
 284
 285 // stop the CDDA playback
 286 static void stopCDDA() {
 287         if (!playing) {
 288                 return;
 289         }
 290
 291         playing = FALSE;
 292 #ifdef _WIN32
 293         WaitForSingleObject(threadid, INFINITE);
 294 #else
 295         pthread_join(threadid, NULL);
 296 #endif
 297 }
 298
 299 // start the CDDA playback
 300 static void startCDDA(void) {
 301         if (playing) {
 302                 stopCDDA();
 303         }
 304
 305         playing = TRUE;
 306
 307 #ifdef _WIN32
 308         threadid = (HANDLE)_beginthread(playthread, 0, NULL);
 309 #else
 310         pthread_create(&threadid, NULL, playthread, NULL);
 311 #endif
 312 }
 313
 314 // this function tries to get the .toc file of the given .bin
 315 // the necessary data is put into the ti (trackinformation)-array
 316 static int parsetoc(const char *isofile) {
 317         char                    tocname[MAXPATHLEN];
 318         FILE                    *fi;
 319         char                    linebuf[256], tmp[256], name[256];
 320         char                    *token;
 321         char                    time[20], time2[20];
 322         unsigned int    t, sector_offs, sector_size;
 323         unsigned int    current_zero_gap = 0;
 324
 325         numtracks = 0;
 326
 327         // copy name of the iso and change extension from .bin to .toc
 328         strncpy(tocname, isofile, sizeof(tocname));
 329         tocname[MAXPATHLEN - 1] = '\0';
 330         if (strlen(tocname) >= 4) {
 331                 strcpy(tocname + strlen(tocname) - 4, ".toc");
 332         }
 333         else {
 334                 return -1;
 335         }
 336
 337         if ((fi = fopen(tocname, "r")) == NULL) {
 338                 // try changing extension to .cue (to satisfy some stupid tutorials)
 339                 strcpy(tocname + strlen(tocname) - 4, ".cue");
 340                 if ((fi = fopen(tocname, "r")) == NULL) {
 341                         // if filename is image.toc.bin, try removing .bin (for Brasero)
 342                         strcpy(tocname, isofile);
 343                         t = strlen(tocname);
 344                         if (t >= 8 && strcmp(tocname + t - 8, ".toc.bin") == 0) {
 345                                 tocname[t - 4] = '\0';
 346                                 if ((fi = fopen(tocname, "r")) == NULL) {
 347                                         return -1;
 348                                 }
 349                         }
 350                         else {
 351                                 return -1;
 352                         }
 353                 }
 354                 // check if it's really a TOC named as a .cue
 355                 fgets(linebuf, sizeof(linebuf), fi);
 356                 token = strtok(linebuf, " ");
 357                 if (token && strncmp(token, "CD", 2) != 0 && strcmp(token, "CATALOG") != 0) {
 358                         fclose(fi);
 359                         return -1;
 360                 }
 361                 fseek(fi, 0, SEEK_SET);
 362         }
 363
 364         memset(&ti, 0, sizeof(ti));
 365         cddaBigEndian = TRUE; // cdrdao uses big-endian for CD Audio
 366
 367         sector_size = CD_FRAMESIZE_RAW;
 368         sector_offs = 2 * 75;
 369
 370         // parse the .toc file
 371         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 372                 // search for tracks
 373                 strncpy(tmp, linebuf, sizeof(linebuf));
 374                 token = strtok(tmp, " ");
 375
 376                 if (token == NULL) continue;
 377
 378                 if (!strcmp(token, "TRACK")) {
 379                         sector_offs += current_zero_gap;
 380                         current_zero_gap = 0;
 381
 382                         // get type of track
 383                         token = strtok(NULL, " ");
 384                         numtracks++;
 385
 386                         if (!strncmp(token, "MODE2_RAW", 9)) {
 387                                 ti[numtracks].type = DATA;
 388                                 sec2msf(2 * 75, ti[numtracks].start); // assume data track on 0:2:0
 389
 390                                 // check if this image contains mixed subchannel data
 391                                 token = strtok(NULL, " ");
 392                                 if (token != NULL && !strncmp(token, "RW", 2)) {
 393                                         sector_size = CD_FRAMESIZE_RAW + SUB_FRAMESIZE;
 394                                         subChanMixed = TRUE;
 395                                         if (!strncmp(token, "RW_RAW", 6))
 396                                                 subChanRaw = TRUE;
 397                                 }
 398                         }
 399                         else if (!strncmp(token, "AUDIO", 5)) {
 400                                 ti[numtracks].type = CDDA;
 401                         }
 402                 }
 403                 else if (!strcmp(token, "DATAFILE")) {
 404                         if (ti[numtracks].type == CDDA) {
 405                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" #%d %8s", name, &t, time2);
 406                                 ti[numtracks].start_offset = t;
 407                                 t = t / sector_size + sector_offs;
 408                                 sec2msf(t, (char *)&ti[numtracks].start);
 409                                 tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 410                         }
 411                         else {
 412                                 sscanf(linebuf, "DATAFILE \"%[^\"]\" %8s", name, time);
 413                                 tok2msf((char *)&time, (char *)&ti[numtracks].length);
 414                         }
 415                 }
 416                 else if (!strcmp(token, "FILE")) {
 417                         sscanf(linebuf, "FILE \"%[^\"]\" #%d %8s %8s", name, &t, time, time2);
 418                         tok2msf((char *)&time, (char *)&ti[numtracks].start);
 419                         t += msf2sec(ti[numtracks].start) * sector_size;
 420                         ti[numtracks].start_offset = t;
 421                         t = t / sector_size + sector_offs;
 422                         sec2msf(t, (char *)&ti[numtracks].start);
 423                         tok2msf((char *)&time2, (char *)&ti[numtracks].length);
 424                 }
 425                 else if (!strcmp(token, "ZERO") || !strcmp(token, "SILENCE")) {
 426                         // skip unneeded optional fields
 427                         while (token != NULL) {
 428                                 token = strtok(NULL, " ");
 429                                 if (strchr(token, ':') != NULL)
 430                                         break;
 431                         }
 432                         if (token != NULL) {
 433                                 tok2msf(token, tmp);
 434                                 current_zero_gap = msf2sec(tmp);
 435                         }
 436                         if (numtracks > 1) {
 437                                 t = ti[numtracks - 1].start_offset;
 438                                 t /= sector_size;
 439                                 pregapOffset = t + msf2sec(ti[numtracks - 1].length);
 440                         }
 441                 }
 442                 else if (!strcmp(token, "START")) {
 443                         token = strtok(NULL, " ");
 444                         if (token != NULL && strchr(token, ':')) {
 445                                 tok2msf(token, tmp);
 446                                 t = msf2sec(tmp);
 447                                 ti[numtracks].start_offset += (t - current_zero_gap) * sector_size;
 448                                 t = msf2sec(ti[numtracks].start) + t;
 449                                 sec2msf(t, (char *)&ti[numtracks].start);
 450                         }
 451                 }
 452         }
 453
 454         fclose(fi);
 455
 456         return 0;
 457 }
 458
 459 // this function tries to get the .cue file of the given .bin
 460 // the necessary data is put into the ti (trackinformation)-array
 461 static int parsecue(const char *isofile) {
 462         char                    cuename[MAXPATHLEN];
 463         char                    filepath[MAXPATHLEN];
 464         char                    *incue_fname;
 465         FILE                    *fi;
 466         char                    *token;
 467         char                    time[20];
 468         char                    *tmp;
 469         char                    linebuf[256], tmpb[256], dummy[256];
 470         unsigned int    incue_max_len;
 471         unsigned int    t, file_len, mode, sector_offs;
 472         unsigned int    sector_size = 2352;
 473
 474         numtracks = 0;
 475
 476         // copy name of the iso and change extension from .bin to .cue
 477         strncpy(cuename, isofile, sizeof(cuename));
 478         cuename[MAXPATHLEN - 1] = '\0';
 479         if (strlen(cuename) >= 4) {
 480                 // If 'isofile' is a '.cd<X>' file, use it as a .cue file
 481                 //  and don't try to search the additional .cue file
 482                 if (strncasecmp(cuename + strlen(cuename) - 4, ".cd", 3) != 0 )
 483                         strcpy(cuename + strlen(cuename) - 4, ".cue");
 484         }
 485         else {
 486                 return -1;
 487         }
 488
 489         if ((fi = fopen(cuename, "r")) == NULL) {
 490                 return -1;
 491         }
 492
 493         // Some stupid tutorials wrongly tell users to use cdrdao to rip a
 494         // "bin/cue" image, which is in fact a "bin/toc" image. So let's check
 495         // that...
 496         if (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 497                 if (!strncmp(linebuf, "CD_ROM_XA", 9)) {
 498                         // Don't proceed further, as this is actually a .toc file rather
 499                         // than a .cue file.
 500                         fclose(fi);
 501                         return parsetoc(isofile);
 502                 }
 503                 fseek(fi, 0, SEEK_SET);
 504         }
 505
 506         // build a path for files referenced in .cue
 507         strncpy(filepath, cuename, sizeof(filepath));
 508         tmp = strrchr(filepath, '/');
 509         if (tmp == NULL)
 510                 tmp = strrchr(filepath, '\\');
 511         if (tmp != NULL)
 512                 tmp++;
 513         else
 514                 tmp = filepath;
 515         *tmp = 0;
 516         filepath[sizeof(filepath) - 1] = 0;
 517         incue_fname = tmp;
 518         incue_max_len = sizeof(filepath) - (tmp - filepath) - 1;
 519
 520         memset(&ti, 0, sizeof(ti));
 521
 522         file_len = 0;
 523         sector_offs = 2 * 75;
 524
 525         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 526                 strncpy(dummy, linebuf, sizeof(linebuf));
 527                 token = strtok(dummy, " ");
 528
 529                 if (token == NULL) {
 530                         continue;
 531                 }
 532
 533                 if (!strcmp(token, "TRACK")) {
 534                         numtracks++;
 535
 536                         sector_size = 0;
 537                         if (strstr(linebuf, "AUDIO") != NULL) {
 538                                 ti[numtracks].type = CDDA;
 539                                 sector_size = 2352;
 540                         }
 541                         else if (sscanf(linebuf, " TRACK %u MODE%u/%u", &t, &mode, &sector_size) == 3)
 542                                 ti[numtracks].type = DATA;
 543                         else {
 544                                 SysPrintf(".cue: failed to parse TRACK\n");
 545                                 ti[numtracks].type = numtracks == 1 ? DATA : CDDA;
 546                         }
 547                         if (sector_size == 0)
 548                                 sector_size = 2352;
 549                 }
 550                 else if (!strcmp(token, "INDEX")) {
 551                         if (sscanf(linebuf, " INDEX %02d %8s", &t, time) != 2)
 552                                 SysPrintf(".cue: failed to parse INDEX\n");
 553                         tok2msf(time, (char *)&ti[numtracks].start);
 554
 555                         t = msf2sec(ti[numtracks].start);
 556                         ti[numtracks].start_offset = t * sector_size;
 557                         t += sector_offs;
 558                         sec2msf(t, ti[numtracks].start);
 559
 560                         // default track length to file length
 561                         t = file_len - ti[numtracks].start_offset / sector_size;
 562                         sec2msf(t, ti[numtracks].length);
 563
 564                         if (numtracks > 1 && ti[numtracks].handle == NULL) {
 565                                 // this track uses the same file as the last,
 566                                 // start of this track is last track's end
 567                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 568                                 sec2msf(t, ti[numtracks - 1].length);
 569                         }
 570                         if (numtracks > 1 && pregapOffset == -1)
 571                                 pregapOffset = ti[numtracks].start_offset / sector_size;
 572                 }
 573                 else if (!strcmp(token, "PREGAP")) {
 574                         if (sscanf(linebuf, " PREGAP %8s", time) == 1) {
 575                                 tok2msf(time, dummy);
 576                                 sector_offs += msf2sec(dummy);
 577                         }
 578                         pregapOffset = -1; // mark to fill track start_offset
 579                 }
 580                 else if (!strcmp(token, "FILE")) {
 581                         t = sscanf(linebuf, " FILE \"%255[^\"]\"", tmpb);
 582                         if (t != 1)
 583                                 sscanf(linebuf, " FILE %255s", tmpb);
 584
 585                         tmp = strrchr(tmpb, '\\');
 586                         if (tmp == NULL)
 587                                 tmp = strrchr(tmpb, '/');
 588                         if (tmp != NULL)
 589                                 tmp++;
 590                         else
 591                                 tmp = tmpb;
 592                         strncpy(incue_fname, tmp, incue_max_len);
 593                         ti[numtracks + 1].handle = fopen(filepath, "rb");
 594
 595                         // update global offset if this is not first file in this .cue
 596                         if (numtracks + 1 > 1) {
 597                                 multifile = 1;
 598                                 sector_offs += file_len;
 599                         }
 600
 601                         file_len = 0;
 602                         if (ti[numtracks + 1].handle == NULL) {
 603                                 SysPrintf(_("\ncould not open: %s\n"), filepath);
 604                                 continue;
 605                         }
 606                         fseek(ti[numtracks + 1].handle, 0, SEEK_END);
 607                         file_len = ftell(ti[numtracks + 1].handle) / 2352;
 608
 609                         if (numtracks == 0 && strlen(isofile) >= 4 &&
 610                                 (strcmp(isofile + strlen(isofile) - 4, ".cue") == 0 ||
 611                                 strncasecmp(isofile + strlen(isofile) - 4, ".cd", 3) == 0)) {
 612                                 // user selected .cue/.cdX as image file, use it's data track instead
 613                                 fclose(cdHandle);
 614                                 cdHandle = fopen(filepath, "rb");
 615                         }
 616                 }
 617         }
 618
 619         fclose(fi);
 620
 621         // if there are no tracks detected, then it's not a cue file
 622         if (!numtracks)
 623                 return -1;
 624
 625         return 0;
 626 }
 627
 628 // this function tries to get the .ccd file of the given .img
 629 // the necessary data is put into the ti (trackinformation)-array
 630 static int parseccd(const char *isofile) {
 631         char                    ccdname[MAXPATHLEN];
 632         FILE                    *fi;
 633         char                    linebuf[256];
 634         unsigned int    t;
 635
 636         numtracks = 0;
 637
 638         // copy name of the iso and change extension from .img to .ccd
 639         strncpy(ccdname, isofile, sizeof(ccdname));
 640         ccdname[MAXPATHLEN - 1] = '\0';
 641         if (strlen(ccdname) >= 4) {
 642                 strcpy(ccdname + strlen(ccdname) - 4, ".ccd");
 643         }
 644         else {
 645                 return -1;
 646         }
 647
 648         if ((fi = fopen(ccdname, "r")) == NULL) {
 649                 return -1;
 650         }
 651
 652         memset(&ti, 0, sizeof(ti));
 653
 654         while (fgets(linebuf, sizeof(linebuf), fi) != NULL) {
 655                 if (!strncmp(linebuf, "[TRACK", 6)){
 656                         numtracks++;
 657                 }
 658                 else if (!strncmp(linebuf, "MODE=", 5)) {
 659                         sscanf(linebuf, "MODE=%d", &t);
 660                         ti[numtracks].type = ((t == 0) ? CDDA : DATA);
 661                 }
 662                 else if (!strncmp(linebuf, "INDEX 1=", 8)) {
 663                         sscanf(linebuf, "INDEX 1=%d", &t);
 664                         sec2msf(t + 2 * 75, ti[numtracks].start);
 665                         ti[numtracks].start_offset = t * 2352;
 666
 667                         // If we've already seen another track, this is its end
 668                         if (numtracks > 1) {
 669                                 t = msf2sec(ti[numtracks].start) - msf2sec(ti[numtracks - 1].start);
 670                                 sec2msf(t, ti[numtracks - 1].length);
 671                         }
 672                 }
 673         }
 674
 675         fclose(fi);
 676
 677         // Fill out the last track's end based on size
 678         if (numtracks >= 1) {
 679                 fseek(cdHandle, 0, SEEK_END);
 680                 t = ftell(cdHandle) / 2352 - msf2sec(ti[numtracks].start) + 2 * 75;
 681                 sec2msf(t, ti[numtracks].length);
 682         }
 683
 684         return 0;
 685 }
 686
 687 // this function tries to get the .mds file of the given .mdf
 688 // the necessary data is put into the ti (trackinformation)-array
 689 static int parsemds(const char *isofile) {
 690         char                    mdsname[MAXPATHLEN];
 691         FILE                    *fi;
 692         unsigned int    offset, extra_offset, l, i;
 693         unsigned short  s;
 694
 695         numtracks = 0;
 696
 697         // copy name of the iso and change extension from .mdf to .mds
 698         strncpy(mdsname, isofile, sizeof(mdsname));
 699         mdsname[MAXPATHLEN - 1] = '\0';
 700         if (strlen(mdsname) >= 4) {
 701                 strcpy(mdsname + strlen(mdsname) - 4, ".mds");
 702         }
 703         else {
 704                 return -1;
 705         }
 706
 707         if ((fi = fopen(mdsname, "rb")) == NULL) {
 708                 return -1;
 709         }
 710
 711         memset(&ti, 0, sizeof(ti));
 712
 713         // check if it's a valid mds file
 714         fread(&i, 1, sizeof(unsigned int), fi);
 715         i = SWAP32(i);
 716         if (i != 0x4944454D) {
 717                 // not an valid mds file
 718                 fclose(fi);
 719                 return -1;
 720         }
 721
 722         // get offset to session block
 723         fseek(fi, 0x50, SEEK_SET);
 724         fread(&offset, 1, sizeof(unsigned int), fi);
 725         offset = SWAP32(offset);
 726
 727         // get total number of tracks
 728         offset += 14;
 729         fseek(fi, offset, SEEK_SET);
 730         fread(&s, 1, sizeof(unsigned short), fi);
 731         s = SWAP16(s);
 732         numtracks = s;
 733
 734         // get offset to track blocks
 735         fseek(fi, 4, SEEK_CUR);
 736         fread(&offset, 1, sizeof(unsigned int), fi);
 737         offset = SWAP32(offset);
 738
 739         // skip lead-in data
 740         while (1) {
 741                 fseek(fi, offset + 4, SEEK_SET);
 742                 if (fgetc(fi) < 0xA0) {
 743                         break;
 744                 }
 745                 offset += 0x50;
 746         }
 747
 748         // check if the image contains mixed subchannel data
 749         fseek(fi, offset + 1, SEEK_SET);
 750         subChanMixed = subChanRaw = (fgetc(fi) ? TRUE : FALSE);
 751
 752         // read track data
 753         for (i = 1; i <= numtracks; i++) {
 754                 fseek(fi, offset, SEEK_SET);
 755
 756                 // get the track type
 757                 ti[i].type = ((fgetc(fi) == 0xA9) ? CDDA : DATA);
 758                 fseek(fi, 8, SEEK_CUR);
 759
 760                 // get the track starting point
 761                 ti[i].start[0] = fgetc(fi);
 762                 ti[i].start[1] = fgetc(fi);
 763                 ti[i].start[2] = fgetc(fi);
 764
 765                 fread(&extra_offset, 1, sizeof(unsigned int), fi);
 766                 extra_offset = SWAP32(extra_offset);
 767
 768                 // get track start offset (in .mdf)
 769                 fseek(fi, offset + 0x28, SEEK_SET);
 770                 fread(&l, 1, sizeof(unsigned int), fi);
 771                 l = SWAP32(l);
 772                 ti[i].start_offset = l;
 773
 774                 // get pregap
 775                 fseek(fi, extra_offset, SEEK_SET);
 776                 fread(&l, 1, sizeof(unsigned int), fi);
 777                 l = SWAP32(l);
 778                 if (l != 0 && i > 1)
 779                         pregapOffset = msf2sec(ti[i].start);
 780
 781                 // get the track length
 782                 fread(&l, 1, sizeof(unsigned int), fi);
 783                 l = SWAP32(l);
 784                 sec2msf(l, ti[i].length);
 785
 786                 offset += 0x50;
 787         }
 788
 789         fclose(fi);
 790         return 0;
 791 }
 792
 793 static int handlepbp(const char *isofile) {
 794         struct {
 795                 unsigned int sig;
 796                 unsigned int dontcare[8];
 797                 unsigned int psar_offs;
 798         } pbp_hdr;
 799         struct {
 800                 unsigned char type;
 801                 unsigned char pad0;
 802                 unsigned char track;
 803                 char index0[3];
 804                 char pad1;
 805                 char index1[3];
 806         } toc_entry;
 807         struct {
 808                 unsigned int offset;
 809                 unsigned int size;
 810                 unsigned int dontcare[6];
 811         } index_entry;
 812         char psar_sig[11];
 813         off_t psisoimg_offs, cdimg_base;
 814         unsigned int t, cd_length;
 815         unsigned int offsettab[8];
 816         const char *ext = NULL;
 817         int i, ret;
 818
 819         if (strlen(isofile) >= 4)
 820                 ext = isofile + strlen(isofile) - 4;
 821         if (ext == NULL || (strcmp(ext, ".pbp") != 0 && strcmp(ext, ".PBP") != 0))
 822                 return -1;
 823
 824         fseeko(cdHandle, 0, SEEK_SET);
 825
 826         numtracks = 0;
 827
 828         ret = fread(&pbp_hdr, 1, sizeof(pbp_hdr), cdHandle);
 829         if (ret != sizeof(pbp_hdr)) {
 830                 SysPrintf("failed to read pbp\n");
 831                 goto fail_io;
 832         }
 833
 834         ret = fseeko(cdHandle, pbp_hdr.psar_offs, SEEK_SET);
 835         if (ret != 0) {
 836                 SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs);
 837                 goto fail_io;
 838         }
 839
 840         psisoimg_offs = pbp_hdr.psar_offs;
 841         fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 842         psar_sig[10] = 0;
 843         if (strcmp(psar_sig, "PSTITLEIMG") == 0) {
 844                 // multidisk image?
 845                 ret = fseeko(cdHandle, pbp_hdr.psar_offs + 0x200, SEEK_SET);
 846                 if (ret != 0) {
 847                         SysPrintf("failed to seek to %x\n", pbp_hdr.psar_offs + 0x200);
 848                         goto fail_io;
 849                 }
 850
 851                 if (fread(&offsettab, 1, sizeof(offsettab), cdHandle) != sizeof(offsettab)) {
 852                         SysPrintf("failed to read offsettab\n");
 853                         goto fail_io;
 854                 }
 855
 856                 for (i = 0; i < sizeof(offsettab) / sizeof(offsettab[0]); i++) {
 857                         if (offsettab[i] == 0)
 858                                 break;
 859                 }
 860                 cdrIsoMultidiskCount = i;
 861                 if (cdrIsoMultidiskCount == 0) {
 862                         SysPrintf("multidisk eboot has 0 images?\n");
 863                         goto fail_io;
 864                 }
 865
 866                 if (cdrIsoMultidiskSelect >= cdrIsoMultidiskCount)
 867                         cdrIsoMultidiskSelect = 0;
 868
 869                 psisoimg_offs += offsettab[cdrIsoMultidiskSelect];
 870
 871                 ret = fseeko(cdHandle, psisoimg_offs, SEEK_SET);
 872                 if (ret != 0) {
 873                         SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs);
 874                         goto fail_io;
 875                 }
 876
 877                 fread(psar_sig, 1, sizeof(psar_sig), cdHandle);
 878                 psar_sig[10] = 0;
 879         }
 880
 881         if (strcmp(psar_sig, "PSISOIMG00") != 0) {
 882                 SysPrintf("bad psar_sig: %s\n", psar_sig);
 883                 goto fail_io;
 884         }
 885
 886         // seek to TOC
 887         ret = fseeko(cdHandle, psisoimg_offs + 0x800, SEEK_SET);
 888         if (ret != 0) {
 889                 SysPrintf("failed to seek to %llx\n", (long long)psisoimg_offs + 0x800);
 890                 goto fail_io;
 891         }
 892
 893         // first 3 entries are special
 894         fseek(cdHandle, sizeof(toc_entry), SEEK_CUR);
 895         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 896         numtracks = btoi(toc_entry.index1[0]);
 897
 898         fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 899         cd_length = btoi(toc_entry.index1[0]) * 60 * 75 +
 900                 btoi(toc_entry.index1[1]) * 75 + btoi(toc_entry.index1[2]);
 901
 902         for (i = 1; i <= numtracks; i++) {
 903                 fread(&toc_entry, 1, sizeof(toc_entry), cdHandle);
 904
 905                 ti[i].type = (toc_entry.type == 1) ? CDDA : DATA;
 906
 907                 ti[i].start_offset = btoi(toc_entry.index0[0]) * 60 * 75 +
 908                         btoi(toc_entry.index0[1]) * 75 + btoi(toc_entry.index0[2]);
 909                 ti[i].start_offset *= 2352;
 910                 ti[i].start[0] = btoi(toc_entry.index1[0]);
 911                 ti[i].start[1] = btoi(toc_entry.index1[1]);
 912                 ti[i].start[2] = btoi(toc_entry.index1[2]);
 913
 914                 if (i > 1) {
 915                         t = msf2sec(ti[i].start) - msf2sec(ti[i - 1].start);
 916                         sec2msf(t, ti[i - 1].length);
 917                 }
 918         }
 919         t = cd_length - ti[numtracks].start_offset / 2352;
 920         sec2msf(t, ti[numtracks].length);
 921
 922         // seek to ISO index
 923         ret = fseeko(cdHandle, psisoimg_offs + 0x4000, SEEK_SET);
 924         if (ret != 0) {
 925                 SysPrintf("failed to seek to ISO index\n");
 926                 goto fail_io;
 927         }
 928
 929         compr_img = calloc(1, sizeof(*compr_img));
 930         if (compr_img == NULL)
 931                 goto fail_io;
 932
 933         compr_img->block_shift = 4;
 934         compr_img->current_block = (unsigned int)-1;
 935
 936         compr_img->index_len = (0x100000 - 0x4000) / sizeof(index_entry);
 937         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
 938         if (compr_img->index_table == NULL)
 939                 goto fail_io;
 940
 941         cdimg_base = psisoimg_offs + 0x100000;
 942         for (i = 0; i < compr_img->index_len; i++) {
 943                 ret = fread(&index_entry, 1, sizeof(index_entry), cdHandle);
 944                 if (ret != sizeof(index_entry)) {
 945                         SysPrintf("failed to read index_entry #%d\n", i);
 946                         goto fail_index;
 947                 }
 948
 949                 if (index_entry.size == 0)
 950                         break;
 951
 952                 compr_img->index_table[i] = cdimg_base + index_entry.offset;
 953         }
 954         compr_img->index_table[i] = cdimg_base + index_entry.offset + index_entry.size;
 955
 956         return 0;
 957
 958 fail_index:
 959         free(compr_img->index_table);
 960         compr_img->index_table = NULL;
 961 fail_io:
 962         if (compr_img != NULL) {
 963                 free(compr_img);
 964                 compr_img = NULL;
 965         }
 966         return -1;
 967 }
 968
 969 static int handlecbin(const char *isofile) {
 970         struct
 971         {
 972                 char magic[4];
 973                 unsigned int header_size;
 974                 unsigned long long total_bytes;
 975                 unsigned int block_size;
 976                 unsigned char ver;              // 1
 977                 unsigned char align;
 978                 unsigned char rsv_06[2];
 979         } ciso_hdr;
 980         const char *ext = NULL;
 981         unsigned int *index_table = NULL;
 982         unsigned int index = 0, plain;
 983         int i, ret;
 984
 985         if (strlen(isofile) >= 5)
 986                 ext = isofile + strlen(isofile) - 5;
 987         if (ext == NULL || (strcasecmp(ext + 1, ".cbn") != 0 && strcasecmp(ext, ".cbin") != 0))
 988                 return -1;
 989
 990         fseek(cdHandle, 0, SEEK_SET);
 991
 992         ret = fread(&ciso_hdr, 1, sizeof(ciso_hdr), cdHandle);
 993         if (ret != sizeof(ciso_hdr)) {
 994                 SysPrintf("failed to read ciso header\n");
 995                 return -1;
 996         }
 997
 998         if (strncmp(ciso_hdr.magic, "CISO", 4) != 0 || ciso_hdr.total_bytes <= 0 || ciso_hdr.block_size <= 0) {
 999                 SysPrintf("bad ciso header\n");
1000                 return -1;
1001         }
1002         if (ciso_hdr.header_size != 0 && ciso_hdr.header_size != sizeof(ciso_hdr)) {
1003                 ret = fseeko(cdHandle, ciso_hdr.header_size, SEEK_SET);
1004                 if (ret != 0) {
1005                         SysPrintf("failed to seek to %x\n", ciso_hdr.header_size);
1006                         return -1;
1007                 }
1008         }
1009
1010         compr_img = calloc(1, sizeof(*compr_img));
1011         if (compr_img == NULL)
1012                 goto fail_io;
1013
1014         compr_img->block_shift = 0;
1015         compr_img->current_block = (unsigned int)-1;
1016
1017         compr_img->index_len = ciso_hdr.total_bytes / ciso_hdr.block_size;
1018         index_table = malloc((compr_img->index_len + 1) * sizeof(index_table[0]));
1019         if (index_table == NULL)
1020                 goto fail_io;
1021
1022         ret = fread(index_table, sizeof(index_table[0]), compr_img->index_len, cdHandle);
1023         if (ret != compr_img->index_len) {
1024                 SysPrintf("failed to read index table\n");
1025                 goto fail_index;
1026         }
1027
1028         compr_img->index_table = malloc((compr_img->index_len + 1) * sizeof(compr_img->index_table[0]));
1029         if (compr_img->index_table == NULL)
1030                 goto fail_index;
1031
1032         for (i = 0; i < compr_img->index_len + 1; i++) {
1033                 index = index_table[i];
1034                 plain = index & 0x80000000;
1035                 index &= 0x7fffffff;
1036                 compr_img->index_table[i] = (off_t)index << ciso_hdr.align;
1037                 if (plain)
1038                         compr_img->index_table[i] |= OFF_T_MSB;
1039         }
1040
1041         return 0;
1042
1043 fail_index:
1044         free(index_table);
1045 fail_io:
1046         if (compr_img != NULL) {
1047                 free(compr_img);
1048                 compr_img = NULL;
1049         }
1050         return -1;
1051 }
1052
1053 #ifdef HAVE_CHD
1054 static int handlechd(const char *isofile) {
1055         chd_img = calloc(1, sizeof(*chd_img));
1056         if (chd_img == NULL)
1057                 goto fail_io;
1058
1059         if(chd_open(isofile, CHD_OPEN_READ, NULL, &chd_img->chd) != CHDERR_NONE)
1060                 goto fail_io;
1061
1062         if (Config.CHD_Precache && (chd_precache(chd_img->chd) != CHDERR_NONE))
1063                 goto fail_io;
1064
1065    chd_img->header = chd_get_header(chd_img->chd);
1066
1067    chd_img->buffer = malloc(chd_img->header->hunkbytes);
1068    if (chd_img->buffer == NULL)
1069                 goto fail_io;
1070
1071    chd_img->sectors_per_hunk = chd_img->header->hunkbytes / (CD_FRAMESIZE_RAW + SUB_FRAMESIZE);
1072    chd_img->current_hunk = (unsigned int)-1;
1073
1074    cddaBigEndian = TRUE;
1075
1076         numtracks = 0;
1077         int frame_offset = 0;
1078         int file_offset = 0;
1079         memset(ti, 0, sizeof(ti));
1080
1081    while (1)
1082    {
1083       struct {
1084          char type[64];
1085          char subtype[32];
1086          char pgtype[32];
1087          char pgsub[32];
1088          uint32_t track;
1089          uint32_t frames;
1090          uint32_t pregap;
1091          uint32_t postgap;
1092       } md = {};
1093       char meta[256];
1094       uint32_t meta_size = 0;
1095
1096       if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA2_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1097          sscanf(meta, CDROM_TRACK_METADATA2_FORMAT, &md.track, md.type, md.subtype, &md.frames, &md.pregap, md.pgtype, md.pgsub, &md.postgap);
1098       else if (chd_get_metadata(chd_img->chd, CDROM_TRACK_METADATA_TAG, numtracks, meta, sizeof(meta), &meta_size, NULL, NULL) == CHDERR_NONE)
1099          sscanf(meta, CDROM_TRACK_METADATA_FORMAT, &md.track, md.type, md.subtype, &md.frames);
1100       else
1101          break;
1102
1103                 if(md.track == 1)
1104                         md.pregap = 150;
1105                 else
1106                         sec2msf(msf2sec(ti[md.track-1].length) + md.pregap, ti[md.track-1].length);
1107
1108                 ti[md.track].type = !strncmp(md.type, "AUDIO", 5) ? CDDA : DATA;
1109
1110                 sec2msf(frame_offset + md.pregap, ti[md.track].start);
1111                 sec2msf(md.frames, ti[md.track].length);
1112
1113                 ti[md.track].start_offset = file_offset;
1114
1115                 frame_offset += md.pregap + md.frames + md.postgap;
1116                 file_offset += md.frames + md.postgap;
1117                 numtracks++;
1118         }
1119
1120         if (numtracks)
1121                 return 0;
1122
1123 fail_io:
1124         if (chd_img != NULL) {
1125                 free(chd_img->buffer);
1126                 free(chd_img);
1127                 chd_img = NULL;
1128         }
1129         return -1;
1130 }
1131 #endif
1132
1133 // this function tries to get the .sub file of the given .img
1134 static int opensubfile(const char *isoname) {
1135         char            subname[MAXPATHLEN];
1136
1137         // copy name of the iso and change extension from .img to .sub
1138         strncpy(subname, isoname, sizeof(subname));
1139         subname[MAXPATHLEN - 1] = '\0';
1140         if (strlen(subname) >= 4) {
1141                 strcpy(subname + strlen(subname) - 4, ".sub");
1142         }
1143         else {
1144                 return -1;
1145         }
1146
1147         subHandle = fopen(subname, "rb");
1148         if (subHandle == NULL) {
1149                 return -1;
1150         }
1151
1152         return 0;
1153 }
1154
1155 static int opensbifile(const char *isoname) {
1156         char            sbiname[MAXPATHLEN], disknum[MAXPATHLEN] = "0";
1157         int             s;
1158
1159         strncpy(sbiname, isoname, sizeof(sbiname));
1160         sbiname[MAXPATHLEN - 1] = '\0';
1161         if (strlen(sbiname) >= 4) {
1162                 if (cdrIsoMultidiskCount > 1) {
1163                         sprintf(disknum, "_%i.sbi", cdrIsoMultidiskSelect + 1);
1164                         strcpy(sbiname + strlen(sbiname) - 4, disknum);
1165                 }
1166                 else
1167                         strcpy(sbiname + strlen(sbiname) - 4, ".sbi");
1168         }
1169         else {
1170                 return -1;
1171         }
1172
1173         fseek(cdHandle, 0, SEEK_END);
1174         s = ftell(cdHandle) / 2352;
1175
1176         return LoadSBI(sbiname, s);
1177 }
1178
1179 #ifdef _WIN32
1180 static void readThreadStop() {}
1181 static void readThreadStart() {}
1182 #else
1183 static pthread_t read_thread_id;
1184
1185 static pthread_cond_t read_thread_msg_avail;
1186 static pthread_cond_t read_thread_msg_done;
1187 static pthread_mutex_t read_thread_msg_lock;
1188
1189 static pthread_cond_t sectorbuffer_cond;
1190 static pthread_mutex_t sectorbuffer_lock;
1191
1192 static boolean read_thread_running = FALSE;
1193 static int read_thread_sector_start = -1;
1194 static int read_thread_sector_end = -1;
1195
1196 typedef struct {
1197   int sector;
1198   long ret;
1199   unsigned char data[CD_FRAMESIZE_RAW];
1200 } SectorBufferEntry;
1201
1202 #define SECTOR_BUFFER_SIZE 4096
1203
1204 static SectorBufferEntry *sectorbuffer;
1205 static size_t sectorbuffer_index;
1206
1207 int (*sync_cdimg_read_func)(FILE *f, unsigned int base, void *dest, int sector);
1208 unsigned char *(*sync_CDR_getBuffer)(void);
1209
1210 static unsigned char * CALLBACK ISOgetBuffer_async(void);
1211 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector);
1212
1213 static void *readThreadMain(void *param) {
1214   int max_sector = -1;
1215   int requested_sector_start = -1;
1216   int requested_sector_end = -1;
1217   int last_read_sector = -1;
1218   int index = 0;
1219
1220   int ra_sector = -1;
1221   int max_ra = 128;
1222   int initial_ra = 1;
1223   int speedmult_ra = 4;
1224
1225   int ra_count = 0;
1226   int how_far_ahead = 0;
1227
1228   unsigned char tmpdata[CD_FRAMESIZE_RAW];
1229   long ret;
1230
1231   max_sector = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1232
1233   while(1) {
1234     pthread_mutex_lock(&read_thread_msg_lock);
1235
1236     // If we don't have readahead and we don't have a sector request, wait for one.
1237     // If we still have readahead to go, don't block, just keep going.
1238     // And if we ever have a sector request pending, acknowledge and reset it.
1239
1240     if (!ra_count) {
1241       if (read_thread_sector_start == -1 && read_thread_running) {
1242         pthread_cond_wait(&read_thread_msg_avail, &read_thread_msg_lock);
1243       }
1244     }
1245
1246     if (read_thread_sector_start != -1) {
1247       requested_sector_start = read_thread_sector_start;
1248       requested_sector_end = read_thread_sector_end;
1249       read_thread_sector_start = -1;
1250       read_thread_sector_end = -1;
1251       pthread_cond_signal(&read_thread_msg_done);
1252     }
1253
1254     pthread_mutex_unlock(&read_thread_msg_lock);
1255
1256     if (!read_thread_running)
1257       break;
1258
1259     // Readahead code, based on the implementation in mednafen psx's cdromif.cpp
1260     if (requested_sector_start != -1) {
1261       if (last_read_sector != -1 && last_read_sector == (requested_sector_start - 1)) {
1262         how_far_ahead = ra_sector - requested_sector_end;
1263
1264         if(how_far_ahead <= max_ra)
1265           ra_count = (max_ra - how_far_ahead + 1 ? max_ra - how_far_ahead + 1 : speedmult_ra);
1266         else
1267           ra_count++;
1268       } else if (requested_sector_end != last_read_sector) {
1269         ra_sector = requested_sector_end;
1270         ra_count = initial_ra;
1271       }
1272
1273       last_read_sector = requested_sector_end;
1274     }
1275
1276     index = ra_sector % SECTOR_BUFFER_SIZE;
1277
1278     // check for end of CD
1279     if (ra_count && ra_sector >= max_sector) {
1280       ra_count = 0;
1281       pthread_mutex_lock(&sectorbuffer_lock);
1282       sectorbuffer[index].ret = -1;
1283       sectorbuffer[index].sector = ra_sector;
1284       pthread_cond_signal(&sectorbuffer_cond);
1285       pthread_mutex_unlock(&sectorbuffer_lock);
1286     }
1287
1288     if (ra_count) {
1289       pthread_mutex_lock(&sectorbuffer_lock);
1290       if (sectorbuffer[index].sector != ra_sector) {
1291         pthread_mutex_unlock(&sectorbuffer_lock);
1292
1293         ret = sync_cdimg_read_func(cdHandle, 0, tmpdata, ra_sector);
1294
1295         pthread_mutex_lock(&sectorbuffer_lock);
1296         sectorbuffer[index].ret = ret;
1297         sectorbuffer[index].sector = ra_sector;
1298         memcpy(sectorbuffer[index].data, tmpdata, CD_FRAMESIZE_RAW);
1299       }
1300       pthread_cond_signal(&sectorbuffer_cond);
1301       pthread_mutex_unlock(&sectorbuffer_lock);
1302
1303       ra_sector++;
1304       ra_count--;
1305     }
1306   }
1307
1308   return NULL;
1309 }
1310
1311 static void readThreadStop() {
1312   if (read_thread_running == TRUE) {
1313     read_thread_running = FALSE;
1314     pthread_cond_signal(&read_thread_msg_avail);
1315     pthread_join(read_thread_id, NULL);
1316   }
1317
1318   pthread_cond_destroy(&read_thread_msg_done);
1319   pthread_cond_destroy(&read_thread_msg_avail);
1320   pthread_mutex_destroy(&read_thread_msg_lock);
1321
1322   pthread_cond_destroy(&sectorbuffer_cond);
1323   pthread_mutex_destroy(&sectorbuffer_lock);
1324
1325   CDR_getBuffer = sync_CDR_getBuffer;
1326   cdimg_read_func = sync_cdimg_read_func;
1327
1328   free(sectorbuffer);
1329   sectorbuffer = NULL;
1330 }
1331
1332 static void readThreadStart() {
1333   SysPrintf("Starting async CD thread\n");
1334
1335   if (read_thread_running == TRUE)
1336     return;
1337
1338   read_thread_running = TRUE;
1339   read_thread_sector_start = -1;
1340   read_thread_sector_end = -1;
1341   sectorbuffer_index = 0;
1342
1343   sectorbuffer = calloc(SECTOR_BUFFER_SIZE, sizeof(SectorBufferEntry));
1344   if(!sectorbuffer)
1345     goto error;
1346
1347   sectorbuffer[0].sector = -1; // Otherwise we might think we've already fetched sector 0!
1348
1349   sync_CDR_getBuffer = CDR_getBuffer;
1350   CDR_getBuffer = ISOgetBuffer_async;
1351   sync_cdimg_read_func = cdimg_read_func;
1352   cdimg_read_func = cdread_async;
1353
1354   if (pthread_cond_init(&read_thread_msg_avail, NULL) ||
1355       pthread_cond_init(&read_thread_msg_done, NULL) ||
1356       pthread_mutex_init(&read_thread_msg_lock, NULL) ||
1357       pthread_cond_init(&sectorbuffer_cond, NULL) ||
1358       pthread_mutex_init(&sectorbuffer_lock, NULL) ||
1359       pthread_create(&read_thread_id, NULL, readThreadMain, NULL))
1360     goto error;
1361
1362   return;
1363
1364  error:
1365   SysPrintf("Error starting async CD thread\n");
1366   SysPrintf("Falling back to sync\n");
1367
1368   readThreadStop();
1369 }
1370 #endif
1371
1372 static int cdread_normal(FILE *f, unsigned int base, void *dest, int sector)
1373 {
1374         fseek(f, base + sector * CD_FRAMESIZE_RAW, SEEK_SET);
1375         return fread(dest, 1, CD_FRAMESIZE_RAW, f);
1376 }
1377
1378 static int cdread_sub_mixed(FILE *f, unsigned int base, void *dest, int sector)
1379 {
1380         int ret;
1381
1382         fseek(f, base + sector * (CD_FRAMESIZE_RAW + SUB_FRAMESIZE), SEEK_SET);
1383         ret = fread(dest, 1, CD_FRAMESIZE_RAW, f);
1384         fread(subbuffer, 1, SUB_FRAMESIZE, f);
1385
1386         if (subChanRaw) DecodeRawSubData();
1387
1388         return ret;
1389 }
1390
1391 static int uncompress2_pcsx(void *out, unsigned long *out_size, void *in, unsigned long in_size)
1392 {
1393         static z_stream z;
1394         int ret = 0;
1395
1396         if (z.zalloc == NULL) {
1397                 // XXX: one-time leak here..
1398                 z.next_in = Z_NULL;
1399                 z.avail_in = 0;
1400                 z.zalloc = Z_NULL;
1401                 z.zfree = Z_NULL;
1402                 z.opaque = Z_NULL;
1403                 ret = inflateInit2(&z, -15);
1404         }
1405         else
1406                 ret = inflateReset(&z);
1407         if (ret != Z_OK)
1408                 return ret;
1409
1410         z.next_in = in;
1411         z.avail_in = in_size;
1412         z.next_out = out;
1413         z.avail_out = *out_size;
1414
1415         ret = inflate(&z, Z_NO_FLUSH);
1416         //inflateEnd(&z);
1417
1418         *out_size -= z.avail_out;
1419         return ret == 1 ? 0 : ret;
1420 }
1421
1422 static int cdread_compressed(FILE *f, unsigned int base, void *dest, int sector)
1423 {
1424         unsigned long cdbuffer_size, cdbuffer_size_expect;
1425         unsigned int size;
1426         int is_compressed;
1427         off_t start_byte;
1428         int ret, block;
1429
1430         if (base)
1431                 sector += base / 2352;
1432
1433         block = sector >> compr_img->block_shift;
1434         compr_img->sector_in_blk = sector & ((1 << compr_img->block_shift) - 1);
1435
1436         if (block == compr_img->current_block) {
1437                 //printf("hit sect %d\n", sector);
1438                 goto finish;
1439         }
1440
1441         if (sector >= compr_img->index_len * 16) {
1442                 SysPrintf("sector %d is past img end\n", sector);
1443                 return -1;
1444         }
1445
1446         start_byte = compr_img->index_table[block] & ~OFF_T_MSB;
1447         if (fseeko(cdHandle, start_byte, SEEK_SET) != 0) {
1448                 SysPrintf("seek error for block %d at %llx: ",
1449                         block, (long long)start_byte);
1450                 perror(NULL);
1451                 return -1;
1452         }
1453
1454         is_compressed = !(compr_img->index_table[block] & OFF_T_MSB);
1455         size = (compr_img->index_table[block + 1] & ~OFF_T_MSB) - start_byte;
1456         if (size > sizeof(compr_img->buff_compressed)) {
1457                 SysPrintf("block %d is too large: %u\n", block, size);
1458                 return -1;
1459         }
1460
1461         if (fread(is_compressed ? compr_img->buff_compressed : compr_img->buff_raw[0],
1462                                 1, size, cdHandle) != size) {
1463                 SysPrintf("read error for block %d at %x: ", block, start_byte);
1464                 perror(NULL);
1465                 return -1;
1466         }
1467
1468         if (is_compressed) {
1469                 cdbuffer_size_expect = sizeof(compr_img->buff_raw[0]) << compr_img->block_shift;
1470                 cdbuffer_size = cdbuffer_size_expect;
1471                 ret = uncompress2_pcsx(compr_img->buff_raw[0], &cdbuffer_size, compr_img->buff_compressed, size);
1472                 if (ret != 0) {
1473                         SysPrintf("uncompress failed with %d for block %d, sector %d\n",
1474                                         ret, block, sector);
1475                         return -1;
1476                 }
1477                 if (cdbuffer_size != cdbuffer_size_expect)
1478                         SysPrintf("cdbuffer_size: %lu != %lu, sector %d\n", cdbuffer_size,
1479                                         cdbuffer_size_expect, sector);
1480         }
1481
1482         // done at last!
1483         compr_img->current_block = block;
1484
1485 finish:
1486         if (dest != cdbuffer) // copy avoid HACK
1487                 memcpy(dest, compr_img->buff_raw[compr_img->sector_in_blk],
1488                         CD_FRAMESIZE_RAW);
1489         return CD_FRAMESIZE_RAW;
1490 }
1491
1492 #ifdef HAVE_CHD
1493 static int cdread_chd(FILE *f, unsigned int base, void *dest, int sector)
1494 {
1495         int hunk;
1496
1497         if (base)
1498                 sector += base;
1499
1500         hunk = sector / chd_img->sectors_per_hunk;
1501         chd_img->sector_in_hunk = sector % chd_img->sectors_per_hunk;
1502
1503         if (hunk != chd_img->current_hunk)
1504         {
1505                 chd_read(chd_img->chd, hunk, chd_img->buffer);
1506                 chd_img->current_hunk = hunk;
1507         }
1508
1509         if (dest != cdbuffer) // copy avoid HACK
1510                 memcpy(dest, chd_img->buffer[chd_img->sector_in_hunk],
1511                         CD_FRAMESIZE_RAW);
1512         return CD_FRAMESIZE_RAW;
1513 }
1514 #endif
1515 static int cdread_2048(FILE *f, unsigned int base, void *dest, int sector)
1516 {
1517         int ret;
1518
1519         fseek(f, base + sector * 2048, SEEK_SET);
1520         ret = fread((char *)dest + 12 * 2, 1, 2048, f);
1521
1522         // not really necessary, fake mode 2 header
1523         memset(cdbuffer, 0, 12 * 2);
1524         sec2msf(sector + 2 * 75, (char *)&cdbuffer[12]);
1525         cdbuffer[12 + 3] = 1;
1526
1527         return ret;
1528 }
1529
1530 #ifndef _WIN32
1531
1532 static int cdread_async(FILE *f, unsigned int base, void *dest, int sector) {
1533   boolean found = FALSE;
1534   int i = sector % SECTOR_BUFFER_SIZE;
1535   long ret;
1536
1537   if (f != cdHandle || base != 0 || dest != cdbuffer) {
1538     // Async reads are only supported for cdbuffer, so call the sync
1539     // function directly.
1540     return sync_cdimg_read_func(f, base, dest, sector);
1541   }
1542
1543   pthread_mutex_lock(&read_thread_msg_lock);
1544
1545   // Only wait if we're not trying to read the next sector and
1546   // sector_start is set (meaning the last request hasn't been
1547   // processed yet)
1548   while(read_thread_sector_start != -1 && read_thread_sector_end + 1 != sector) {
1549     pthread_cond_wait(&read_thread_msg_done, &read_thread_msg_lock);
1550   }
1551
1552   if (read_thread_sector_start == -1)
1553     read_thread_sector_start = sector;
1554
1555   read_thread_sector_end = sector;
1556   pthread_cond_signal(&read_thread_msg_avail);
1557   pthread_mutex_unlock(&read_thread_msg_lock);
1558
1559   do {
1560     pthread_mutex_lock(&sectorbuffer_lock);
1561     if (sectorbuffer[i].sector == sector) {
1562       sectorbuffer_index = i;
1563       ret = sectorbuffer[i].ret;
1564       found = TRUE;
1565     }
1566
1567     if (!found) {
1568       pthread_cond_wait(&sectorbuffer_cond, &sectorbuffer_lock);
1569     }
1570     pthread_mutex_unlock(&sectorbuffer_lock);
1571   } while (!found);
1572
1573   return ret;
1574 }
1575
1576 #endif
1577
1578 static unsigned char * CALLBACK ISOgetBuffer_compr(void) {
1579         return compr_img->buff_raw[compr_img->sector_in_blk] + 12;
1580 }
1581
1582 #ifdef HAVE_CHD
1583 static unsigned char * CALLBACK ISOgetBuffer_chd(void) {
1584         return chd_img->buffer[chd_img->sector_in_hunk] + 12;
1585 }
1586 #endif
1587
1588 #ifndef _WIN32
1589 static unsigned char * CALLBACK ISOgetBuffer_async(void) {
1590   unsigned char *buffer;
1591   pthread_mutex_lock(&sectorbuffer_lock);
1592   buffer = sectorbuffer[sectorbuffer_index].data;
1593   pthread_mutex_unlock(&sectorbuffer_lock);
1594   return buffer + 12;
1595 }
1596
1597 #endif
1598
1599 static unsigned char * CALLBACK ISOgetBuffer(void) {
1600         return cdbuffer + 12;
1601 }
1602
1603 static void PrintTracks(void) {
1604         int i;
1605
1606         for (i = 1; i <= numtracks; i++) {
1607                 SysPrintf(_("Track %.2d (%s) - Start %.2d:%.2d:%.2d, Length %.2d:%.2d:%.2d\n"),
1608                         i, (ti[i].type == DATA ? "DATA" : "AUDIO"),
1609                         ti[i].start[0], ti[i].start[1], ti[i].start[2],
1610                         ti[i].length[0], ti[i].length[1], ti[i].length[2]);
1611         }
1612 }
1613
1614 // This function is invoked by the front-end when opening an ISO
1615 // file for playback
1616 static long CALLBACK ISOopen(void) {
1617         boolean isMode1ISO = FALSE;
1618         char alt_bin_filename[MAXPATHLEN];
1619         const char *bin_filename;
1620         char image_str[1024] = {0};
1621
1622         if (cdHandle != NULL) {
1623                 return 0; // it's already open
1624         }
1625
1626         cdHandle = fopen(GetIsoFile(), "rb");
1627         if (cdHandle == NULL) {
1628                 SysPrintf(_("Could't open '%s' for reading: %s\n"),
1629                         GetIsoFile(), strerror(errno));
1630                 return -1;
1631         }
1632
1633         sprintf(image_str, "Loaded CD Image: %s", GetIsoFile());
1634
1635         cddaBigEndian = FALSE;
1636         subChanMixed = FALSE;
1637         subChanRaw = FALSE;
1638         pregapOffset = 0;
1639         cdrIsoMultidiskCount = 1;
1640         multifile = 0;
1641
1642         CDR_getBuffer = ISOgetBuffer;
1643         cdimg_read_func = cdread_normal;
1644
1645         if (parsetoc(GetIsoFile()) == 0) {
1646                 strcat(image_str, "[+toc]");
1647         }
1648         else if (parseccd(GetIsoFile()) == 0) {
1649                 strcat(image_str, "[+ccd]");
1650         }
1651         else if (parsemds(GetIsoFile()) == 0) {
1652                 strcat(image_str, "[+mds]");
1653         }
1654         else if (parsecue(GetIsoFile()) == 0) {
1655                 strcat(image_str, "[+cue]");
1656         }
1657         if (handlepbp(GetIsoFile()) == 0) {
1658                 strcat(image_str, "[+pbp]");
1659                 CDR_getBuffer = ISOgetBuffer_compr;
1660                 cdimg_read_func = cdread_compressed;
1661         }
1662         else if (handlecbin(GetIsoFile()) == 0) {
1663                 strcat(image_str, "[+cbin]");
1664                 CDR_getBuffer = ISOgetBuffer_compr;
1665                 cdimg_read_func = cdread_compressed;
1666         }
1667 #ifdef HAVE_CHD
1668         else if (handlechd(GetIsoFile()) == 0) {
1669                 strcat(image_str, "[+chd]");
1670                 CDR_getBuffer = ISOgetBuffer_chd;
1671                 cdimg_read_func = cdread_chd;
1672         }
1673 #endif
1674
1675         if (!subChanMixed && opensubfile(GetIsoFile()) == 0) {
1676                 strcat(image_str, "[+sub]");
1677         }
1678         if (opensbifile(GetIsoFile()) == 0) {
1679                 strcat(image_str, "[+sbi]");
1680         }
1681
1682         fseeko(cdHandle, 0, SEEK_END);
1683
1684         // maybe user selected metadata file instead of main .bin ..
1685         bin_filename = GetIsoFile();
1686         if (ftello(cdHandle) < 2352 * 0x10) {
1687                 static const char *exts[] = { ".bin", ".BIN", ".img", ".IMG" };
1688                 FILE *tmpf = NULL;
1689                 size_t i;
1690                 char *p;
1691
1692                 strncpy(alt_bin_filename, bin_filename, sizeof(alt_bin_filename));
1693                 alt_bin_filename[MAXPATHLEN - 1] = '\0';
1694                 if (strlen(alt_bin_filename) >= 4) {
1695                         p = alt_bin_filename + strlen(alt_bin_filename) - 4;
1696                         for (i = 0; i < sizeof(exts) / sizeof(exts[0]); i++) {
1697                                 strcpy(p, exts[i]);
1698                                 tmpf = fopen(alt_bin_filename, "rb");
1699                                 if (tmpf != NULL)
1700                                         break;
1701                         }
1702                 }
1703                 if (tmpf != NULL) {
1704                         bin_filename = alt_bin_filename;
1705                         fclose(cdHandle);
1706                         cdHandle = tmpf;
1707                         fseeko(cdHandle, 0, SEEK_END);
1708                 }
1709         }
1710
1711         // guess whether it is mode1/2048
1712         if (ftello(cdHandle) % 2048 == 0) {
1713                 unsigned int modeTest = 0;
1714                 fseek(cdHandle, 0, SEEK_SET);
1715                 fread(&modeTest, 4, 1, cdHandle);
1716                 if (SWAP32(modeTest) != 0xffffff00) {
1717                         strcat(image_str, "[2048]");
1718                         isMode1ISO = TRUE;
1719                 }
1720         }
1721         fseek(cdHandle, 0, SEEK_SET);
1722
1723         SysPrintf("%s.\n", image_str);
1724
1725         PrintTracks();
1726
1727         if (subChanMixed)
1728                 cdimg_read_func = cdread_sub_mixed;
1729         else if (isMode1ISO)
1730                 cdimg_read_func = cdread_2048;
1731
1732         // make sure we have another handle open for cdda
1733         if (numtracks > 1 && ti[1].handle == NULL) {
1734                 ti[1].handle = fopen(bin_filename, "rb");
1735         }
1736         cdda_cur_sector = 0;
1737         cdda_file_offset = 0;
1738
1739   if (Config.AsyncCD) {
1740     readThreadStart();
1741   }
1742         return 0;
1743 }
1744
1745 static long CALLBACK ISOclose(void) {
1746         int i;
1747
1748         if (cdHandle != NULL) {
1749                 fclose(cdHandle);
1750                 cdHandle = NULL;
1751         }
1752         if (subHandle != NULL) {
1753                 fclose(subHandle);
1754                 subHandle = NULL;
1755         }
1756         stopCDDA();
1757         cddaHandle = NULL;
1758
1759         if (compr_img != NULL) {
1760                 free(compr_img->index_table);
1761                 free(compr_img);
1762                 compr_img = NULL;
1763         }
1764
1765 #ifdef HAVE_CHD
1766         if (chd_img != NULL) {
1767                 chd_close(chd_img->chd);
1768                 free(chd_img->buffer);
1769                 free(chd_img);
1770                 chd_img = NULL;
1771         }
1772 #endif
1773
1774         for (i = 1; i <= numtracks; i++) {
1775                 if (ti[i].handle != NULL) {
1776                         fclose(ti[i].handle);
1777                         ti[i].handle = NULL;
1778                 }
1779         }
1780         numtracks = 0;
1781         ti[1].type = 0;
1782         UnloadSBI();
1783
1784         memset(cdbuffer, 0, sizeof(cdbuffer));
1785         CDR_getBuffer = ISOgetBuffer;
1786
1787         if (Config.AsyncCD) {
1788                 readThreadStop();
1789         }
1790
1791         return 0;
1792 }
1793
1794 static long CALLBACK ISOinit(void) {
1795         assert(cdHandle == NULL);
1796         assert(subHandle == NULL);
1797
1798         return 0; // do nothing
1799 }
1800
1801 static long CALLBACK ISOshutdown(void) {
1802         ISOclose();
1803         return 0;
1804 }
1805
1806 // return Starting and Ending Track
1807 // buffer:
1808 //  byte 0 - start track
1809 //  byte 1 - end track
1810 static long CALLBACK ISOgetTN(unsigned char *buffer) {
1811         buffer[0] = 1;
1812
1813         if (numtracks > 0) {
1814                 buffer[1] = numtracks;
1815         }
1816         else {
1817                 buffer[1] = 1;
1818         }
1819
1820         return 0;
1821 }
1822
1823 // return Track Time
1824 // buffer:
1825 //  byte 0 - frame
1826 //  byte 1 - second
1827 //  byte 2 - minute
1828 static long CALLBACK ISOgetTD(unsigned char track, unsigned char *buffer) {
1829         if (track == 0) {
1830                 unsigned int sect;
1831                 unsigned char time[3];
1832                 sect = msf2sec(ti[numtracks].start) + msf2sec(ti[numtracks].length);
1833                 sec2msf(sect, (char *)time);
1834                 buffer[2] = time[0];
1835                 buffer[1] = time[1];
1836                 buffer[0] = time[2];
1837         }
1838         else if (numtracks > 0 && track <= numtracks) {
1839                 buffer[2] = ti[track].start[0];
1840                 buffer[1] = ti[track].start[1];
1841                 buffer[0] = ti[track].start[2];
1842         }
1843         else {
1844                 buffer[2] = 0;
1845                 buffer[1] = 2;
1846                 buffer[0] = 0;
1847         }
1848
1849         return 0;
1850 }
1851
1852 // decode 'raw' subchannel data ripped by cdrdao
1853 static void DecodeRawSubData(void) {
1854         unsigned char subQData[12];
1855         int i;
1856
1857         memset(subQData, 0, sizeof(subQData));
1858
1859         for (i = 0; i < 8 * 12; i++) {
1860                 if (subbuffer[i] & (1 << 6)) { // only subchannel Q is needed
1861                         subQData[i >> 3] |= (1 << (7 - (i & 7)));
1862                 }
1863         }
1864
1865         memcpy(&subbuffer[12], subQData, 12);
1866 }
1867
1868 // read track
1869 // time: byte 0 - minute; byte 1 - second; byte 2 - frame
1870 // uses bcd format
1871 static long CALLBACK ISOreadTrack(unsigned char *time) {
1872         int sector = MSF2SECT(btoi(time[0]), btoi(time[1]), btoi(time[2]));
1873         long ret;
1874
1875         if (cdHandle == NULL) {
1876                 return -1;
1877         }
1878
1879         if (pregapOffset) {
1880                 subChanMissing = FALSE;
1881                 if (sector >= pregapOffset) {
1882                         sector -= 2 * 75;
1883                         if (sector < pregapOffset)
1884                                 subChanMissing = TRUE;
1885                 }
1886         }
1887
1888         ret = cdimg_read_func(cdHandle, 0, cdbuffer, sector);
1889         if (ret < 0)
1890                 return -1;
1891
1892         if (subHandle != NULL) {
1893                 fseek(subHandle, sector * SUB_FRAMESIZE, SEEK_SET);
1894                 fread(subbuffer, 1, SUB_FRAMESIZE, subHandle);
1895
1896                 if (subChanRaw) DecodeRawSubData();
1897         }
1898
1899         return 0;
1900 }
1901
1902 // plays cdda audio
1903 // sector: byte 0 - minute; byte 1 - second; byte 2 - frame
1904 // does NOT uses bcd format
1905 static long CALLBACK ISOplay(unsigned char *time) {
1906         unsigned int i;
1907
1908         if (numtracks <= 1)
1909                 return 0;
1910
1911         // find the track
1912         cdda_cur_sector = msf2sec((char *)time);
1913         for (i = numtracks; i > 1; i--) {
1914                 cdda_first_sector = msf2sec(ti[i].start);
1915                 if (cdda_first_sector <= cdda_cur_sector + 2 * 75)
1916                         break;
1917         }
1918         cdda_file_offset = ti[i].start_offset;
1919
1920         // find the file that contains this track
1921         for (; i > 1; i--)
1922                 if (ti[i].handle != NULL)
1923                         break;
1924
1925         cddaHandle = ti[i].handle;
1926
1927         if (SPU_playCDDAchannel != NULL)
1928                 startCDDA();
1929
1930         return 0;
1931 }
1932
1933 // stops cdda audio
1934 static long CALLBACK ISOstop(void) {
1935         stopCDDA();
1936         return 0;
1937 }
1938
1939 // gets subchannel data
1940 static unsigned char* CALLBACK ISOgetBufferSub(void) {
1941         if ((subHandle != NULL || subChanMixed) && !subChanMissing) {
1942                 return subbuffer;
1943         }
1944
1945         return NULL;
1946 }
1947
1948 static long CALLBACK ISOgetStatus(struct CdrStat *stat) {
1949         u32 sect;
1950
1951         CDR__getStatus(stat);
1952
1953         if (playing) {
1954                 stat->Type = 0x02;
1955                 stat->Status |= 0x80;
1956         }
1957         else {
1958                 // BIOS - boot ID (CD type)
1959                 stat->Type = ti[1].type;
1960         }
1961
1962         // relative -> absolute time
1963         sect = cddaCurPos;
1964         sec2msf(sect, (char *)stat->Time);
1965
1966         return 0;
1967 }
1968
1969 // read CDDA sector into buffer
1970 long CALLBACK ISOreadCDDA(unsigned char m, unsigned char s, unsigned char f, unsigned char *buffer) {
1971         unsigned char msf[3] = {m, s, f};
1972         unsigned int file, track, track_start = 0;
1973         int ret;
1974
1975         cddaCurPos = msf2sec((char *)msf);
1976
1977         // find current track index
1978         for (track = numtracks; ; track--) {
1979                 track_start = msf2sec(ti[track].start);
1980                 if (track_start <= cddaCurPos)
1981                         break;
1982                 if (track == 1)
1983                         break;
1984         }
1985
1986         // data tracks play silent
1987         if (ti[track].type != CDDA) {
1988                 memset(buffer, 0, CD_FRAMESIZE_RAW);
1989                 return 0;
1990         }
1991
1992         file = 1;
1993         if (multifile) {
1994                 // find the file that contains this track
1995                 for (file = track; file > 1; file--)
1996                         if (ti[file].handle != NULL)
1997                                 break;
1998         }
1999
2000         ret = cdimg_read_func(ti[file].handle, ti[track].start_offset,
2001                 buffer, cddaCurPos - track_start);
2002         if (ret != CD_FRAMESIZE_RAW) {
2003                 memset(buffer, 0, CD_FRAMESIZE_RAW);
2004                 return -1;
2005         }
2006
2007         if (cddaBigEndian) {
2008                 int i;
2009                 unsigned char tmp;
2010
2011                 for (i = 0; i < CD_FRAMESIZE_RAW / 2; i++) {
2012                         tmp = buffer[i * 2];
2013                         buffer[i * 2] = buffer[i * 2 + 1];
2014                         buffer[i * 2 + 1] = tmp;
2015                 }
2016         }
2017
2018         return 0;
2019 }
2020
2021 void cdrIsoInit(void) {
2022         CDR_init = ISOinit;
2023         CDR_shutdown = ISOshutdown;
2024         CDR_open = ISOopen;
2025         CDR_close = ISOclose;
2026         CDR_getTN = ISOgetTN;
2027         CDR_getTD = ISOgetTD;
2028         CDR_readTrack = ISOreadTrack;
2029         CDR_getBuffer = ISOgetBuffer;
2030         CDR_play = ISOplay;
2031         CDR_stop = ISOstop;
2032         CDR_getBufferSub = ISOgetBufferSub;
2033         CDR_getStatus = ISOgetStatus;
2034         CDR_readCDDA = ISOreadCDDA;
2035
2036         CDR_getDriveLetter = CDR__getDriveLetter;
2037         CDR_configure = CDR__configure;
2038         CDR_test = CDR__test;
2039         CDR_about = CDR__about;
2040         CDR_setfilename = CDR__setfilename;
2041
2042         numtracks = 0;
2043 }
2044
2045 int cdrIsoActive(void) {
2046         return (cdHandle != NULL);
2047 }