src/share/grabbag/cuesheet.c

   1 /* grabbag - Convenience lib for various routines common to several tools
   2  * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009  Josh Coalson
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #if HAVE_CONFIG_H
  20 #  include <config.h>
  21 #endif
  22
  23 #include "share/grabbag.h"
  24 #include "FLAC/assert.h"
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 unsigned grabbag__cuesheet_msf_to_frame(unsigned minutes, unsigned seconds, unsigned frames)
  30 {
  31         return ((minutes * 60) + seconds) * 75 + frames;
  32 }
  33
  34 void grabbag__cuesheet_frame_to_msf(unsigned frame, unsigned *minutes, unsigned *seconds, unsigned *frames)
  35 {
  36         *frames = frame % 75;
  37         frame /= 75;
  38         *seconds = frame % 60;
  39         frame /= 60;
  40         *minutes = frame;
  41 }
  42
  43 /* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
  44 static int local__parse_int_(const char *s)
  45 {
  46         int ret = 0;
  47         char c;
  48
  49         if(*s == '\0')
  50                 return -1;
  51
  52         while('\0' != (c = *s++))
  53                 if(c >= '0' && c <= '9')
  54                         ret = ret * 10 + (c - '0');
  55                 else
  56                         return -1;
  57
  58         return ret;
  59 }
  60
  61 /* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
  62 static FLAC__int64 local__parse_int64_(const char *s)
  63 {
  64         FLAC__int64 ret = 0;
  65         char c;
  66
  67         if(*s == '\0')
  68                 return -1;
  69
  70         while('\0' != (c = *s++))
  71                 if(c >= '0' && c <= '9')
  72                         ret = ret * 10 + (c - '0');
  73                 else
  74                         return -1;
  75
  76         return ret;
  77 }
  78
  79 /* accept minute:second:frame syntax of '[0-9]+:[0-9][0-9]?:[0-9][0-9]?', but max second of 59 and max frame of 74, e.g. 0:0:0, 123:45:67
  80  * return sample number or <0 for error
  81  * WATCHOUT: if sample rate is not evenly divisible by 75, the resulting sample number will be approximate
  82  */
  83 static FLAC__int64 local__parse_msf_(const char *s, unsigned sample_rate)
  84 {
  85         FLAC__int64 ret, field;
  86         char c;
  87
  88         c = *s++;
  89         if(c >= '0' && c <= '9')
  90                 field = (c - '0');
  91         else
  92                 return -1;
  93         while(':' != (c = *s++)) {
  94                 if(c >= '0' && c <= '9')
  95                         field = field * 10 + (c - '0');
  96                 else
  97                         return -1;
  98         }
  99
 100         ret = field * 60 * sample_rate;
 101
 102         c = *s++;
 103         if(c >= '0' && c <= '9')
 104                 field = (c - '0');
 105         else
 106                 return -1;
 107         if(':' != (c = *s++)) {
 108                 if(c >= '0' && c <= '9') {
 109                         field = field * 10 + (c - '0');
 110                         c = *s++;
 111                         if(c != ':')
 112                                 return -1;
 113                 }
 114                 else
 115                         return -1;
 116         }
 117
 118         if(field >= 60)
 119                 return -1;
 120
 121         ret += field * sample_rate;
 122
 123         c = *s++;
 124         if(c >= '0' && c <= '9')
 125                 field = (c - '0');
 126         else
 127                 return -1;
 128         if('\0' != (c = *s++)) {
 129                 if(c >= '0' && c <= '9') {
 130                         field = field * 10 + (c - '0');
 131                         c = *s++;
 132                 }
 133                 else
 134                         return -1;
 135         }
 136
 137         if(c != '\0')
 138                 return -1;
 139
 140         if(field >= 75)
 141                 return -1;
 142
 143         ret += field * (sample_rate / 75);
 144
 145         return ret;
 146 }
 147
 148 /* accept minute:second syntax of '[0-9]+:[0-9][0-9]?{,.[0-9]+}', but second < 60, e.g. 0:0.0, 3:5, 15:31.731
 149  * return sample number or <0 for error
 150  * WATCHOUT: depending on the sample rate, the resulting sample number may be approximate with fractional seconds
 151  */
 152 static FLAC__int64 local__parse_ms_(const char *s, unsigned sample_rate)
 153 {
 154         FLAC__int64 ret, field;
 155         double x;
 156         char c, *end;
 157
 158         c = *s++;
 159         if(c >= '0' && c <= '9')
 160                 field = (c - '0');
 161         else
 162                 return -1;
 163         while(':' != (c = *s++)) {
 164                 if(c >= '0' && c <= '9')
 165                         field = field * 10 + (c - '0');
 166                 else
 167                         return -1;
 168         }
 169
 170         ret = field * 60 * sample_rate;
 171
 172         s++; /* skip the ':' */
 173         if(strspn(s, "0123456789.") != strlen(s))
 174                 return -1;
 175         x = strtod(s, &end);
 176         if(*end || end == s)
 177                 return -1;
 178         if(x < 0.0 || x >= 60.0)
 179                 return -1;
 180
 181         ret += (FLAC__int64)(x * sample_rate);
 182
 183         return ret;
 184 }
 185
 186 static char *local__get_field_(char **s, FLAC__bool allow_quotes)
 187 {
 188         FLAC__bool has_quote = false;
 189         char *p;
 190
 191         FLAC__ASSERT(0 != s);
 192
 193         if(0 == *s)
 194                 return 0;
 195
 196         /* skip leading whitespace */
 197         while(**s && 0 != strchr(" \t\r\n", **s))
 198                 (*s)++;
 199
 200         if(**s == 0) {
 201                 *s = 0;
 202                 return 0;
 203         }
 204
 205         if(allow_quotes && (**s == '"')) {
 206                 has_quote = true;
 207                 (*s)++;
 208                 if(**s == 0) {
 209                         *s = 0;
 210                         return 0;
 211                 }
 212         }
 213
 214         p = *s;
 215
 216         if(has_quote) {
 217                 *s = strchr(*s, '\"');
 218                 /* if there is no matching end quote, it's an error */
 219                 if(0 == *s)
 220                         p = *s = 0;
 221                 else {
 222                         **s = '\0';
 223                         (*s)++;
 224                 }
 225         }
 226         else {
 227                 while(**s && 0 == strchr(" \t\r\n", **s))
 228                         (*s)++;
 229                 if(**s) {
 230                         **s = '\0';
 231                         (*s)++;
 232                 }
 233                 else
 234                         *s = 0;
 235         }
 236
 237         return p;
 238 }
 239
 240 static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__StreamMetadata *cuesheet, unsigned sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
 241 {
 242 #if defined _MSC_VER || defined __MINGW32__ || defined __EMX__
 243 #define FLAC__STRCASECMP stricmp
 244 #else
 245 #define FLAC__STRCASECMP strcasecmp
 246 #endif
 247         char buffer[4096], *line, *field;
 248         unsigned forced_leadout_track_num = 0;
 249         FLAC__uint64 forced_leadout_track_offset = 0;
 250         int in_track_num = -1, in_index_num = -1;
 251         FLAC__bool disc_has_catalog = false, track_has_flags = false, track_has_isrc = false, has_forced_leadout = false;
 252         FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
 253
 254         FLAC__ASSERT(!is_cdda || sample_rate == 44100);
 255         /* double protection */
 256         if(is_cdda && sample_rate != 44100) {
 257                 *error_message = "CD-DA cuesheet only allowed with 44.1kHz sample rate";
 258                 return false;
 259         }
 260
 261         cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
 262         cs->is_cd = is_cdda;
 263
 264         while(0 != fgets(buffer, sizeof(buffer), file)) {
 265                 (*last_line_read)++;
 266                 line = buffer;
 267
 268                 {
 269                         size_t linelen = strlen(line);
 270                         if((linelen == sizeof(buffer)-1) && line[linelen-1] != '\n') {
 271                                 *error_message = "line too long";
 272                                 return false;
 273                         }
 274                 }
 275
 276                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 277                         if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
 278                                 if(disc_has_catalog) {
 279                                         *error_message = "found multiple CATALOG commands";
 280                                         return false;
 281                                 }
 282                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
 283                                         *error_message = "CATALOG is missing catalog number";
 284                                         return false;
 285                                 }
 286                                 if(strlen(field) >= sizeof(cs->media_catalog_number)) {
 287                                         *error_message = "CATALOG number is too long";
 288                                         return false;
 289                                 }
 290                                 if(is_cdda && (strlen(field) != 13 || strspn(field, "0123456789") != 13)) {
 291                                         *error_message = "CD-DA CATALOG number must be 13 decimal digits";
 292                                         return false;
 293                                 }
 294                                 strcpy(cs->media_catalog_number, field);
 295                                 disc_has_catalog = true;
 296                         }
 297                         else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
 298                                 if(track_has_flags) {
 299                                         *error_message = "found multiple FLAGS commands";
 300                                         return false;
 301                                 }
 302                                 if(in_track_num < 0 || in_index_num >= 0) {
 303                                         *error_message = "FLAGS command must come after TRACK but before INDEX";
 304                                         return false;
 305                                 }
 306                                 while(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 307                                         if(0 == FLAC__STRCASECMP(field, "PRE"))
 308                                                 cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
 309                                 }
 310                                 track_has_flags = true;
 311                         }
 312                         else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
 313                                 FLAC__int64 xx;
 314                                 FLAC__StreamMetadata_CueSheet_Track *track = &cs->tracks[cs->num_tracks-1];
 315                                 if(in_track_num < 0) {
 316                                         *error_message = "found INDEX before any TRACK";
 317                                         return false;
 318                                 }
 319                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 320                                         *error_message = "INDEX is missing index number";
 321                                         return false;
 322                                 }
 323                                 in_index_num = local__parse_int_(field);
 324                                 if(in_index_num < 0) {
 325                                         *error_message = "INDEX has invalid index number";
 326                                         return false;
 327                                 }
 328                                 FLAC__ASSERT(cs->num_tracks > 0);
 329                                 if(track->num_indices == 0) {
 330                                         /* it's the first index point of the track */
 331                                         if(in_index_num > 1) {
 332                                                 *error_message = "first INDEX number of a TRACK must be 0 or 1";
 333                                                 return false;
 334                                         }
 335                                 }
 336                                 else {
 337                                         if(in_index_num != track->indices[track->num_indices-1].number + 1) {
 338                                                 *error_message = "INDEX numbers must be sequential";
 339                                                 return false;
 340                                         }
 341                                 }
 342                                 if(is_cdda && in_index_num > 99) {
 343                                         *error_message = "CD-DA INDEX number must be between 0 and 99, inclusive";
 344                                         return false;
 345                                 }
 346                                 /*@@@ search for duplicate track number? */
 347                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 348                                         *error_message = "INDEX is missing an offset after the index number";
 349                                         return false;
 350                                 }
 351                                 /* first parse as minute:second:frame format */
 352                                 xx = local__parse_msf_(field, sample_rate);
 353                                 if(xx < 0) {
 354                                         /* CD-DA must use only MM:SS:FF format */
 355                                         if(is_cdda) {
 356                                                 *error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
 357                                                 return false;
 358                                         }
 359                                         /* as an extension for non-CD-DA we allow MM:SS.SS or raw sample number */
 360                                         xx = local__parse_ms_(field, sample_rate);
 361                                         if(xx < 0) {
 362                                                 xx = local__parse_int64_(field);
 363                                                 if(xx < 0) {
 364                                                         *error_message = "illegal INDEX offset";
 365                                                         return false;
 366                                                 }
 367                                         }
 368                                 }
 369                                 else if(sample_rate % 75) {
 370                                         *error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
 371                                         return false;
 372                                 }
 373                                 if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
 374                                         *error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
 375                                         return false;
 376                                 }
 377                                 if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
 378                                         *error_message = "CD-DA INDEX offsets must increase in time";
 379                                         return false;
 380                                 }
 381                                 /* fill in track offset if it's the first index of the track */
 382                                 if(track->num_indices == 0)
 383                                         track->offset = (FLAC__uint64)xx;
 384                                 if(is_cdda && cs->num_tracks > 1) {
 385                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
 386                                         if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
 387                                                 *error_message = "CD-DA INDEX offsets must increase in time";
 388                                                 return false;
 389                                         }
 390                                 }
 391                                 if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
 392                                         *error_message = "memory allocation error";
 393                                         return false;
 394                                 }
 395                                 track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
 396                                 track->indices[track->num_indices-1].number = in_index_num;
 397                         }
 398                         else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
 399                                 char *l, *r;
 400                                 if(track_has_isrc) {
 401                                         *error_message = "found multiple ISRC commands";
 402                                         return false;
 403                                 }
 404                                 if(in_track_num < 0 || in_index_num >= 0) {
 405                                         *error_message = "ISRC command must come after TRACK but before INDEX";
 406                                         return false;
 407                                 }
 408                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 409                                         *error_message = "ISRC is missing ISRC number";
 410                                         return false;
 411                                 }
 412                                 /* strip out dashes */
 413                                 for(l = r = field; *r; r++) {
 414                                         if(*r != '-')
 415                                                 *l++ = *r;
 416                                 }
 417                                 *l = '\0';
 418                                 if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
 419                                         *error_message = "invalid ISRC number";
 420                                         return false;
 421                                 }
 422                                 strcpy(cs->tracks[cs->num_tracks-1].isrc, field);
 423                                 track_has_isrc = true;
 424                         }
 425                         else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
 426                                 if(cs->num_tracks > 0) {
 427                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
 428                                         if(
 429                                                 prev->num_indices == 0 ||
 430                                                 (
 431                                                         is_cdda &&
 432                                                         (
 433                                                                 (prev->num_indices == 1 && prev->indices[0].number != 1) ||
 434                                                                 (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
 435                                                         )
 436                                                 )
 437                                         ) {
 438                                                 *error_message = is_cdda?
 439                                                         "previous TRACK must specify at least one INDEX 01" :
 440                                                         "previous TRACK must specify at least one INDEX";
 441                                                 return false;
 442                                         }
 443                                 }
 444                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 445                                         *error_message = "TRACK is missing track number";
 446                                         return false;
 447                                 }
 448                                 in_track_num = local__parse_int_(field);
 449                                 if(in_track_num < 0) {
 450                                         *error_message = "TRACK has invalid track number";
 451                                         return false;
 452                                 }
 453                                 if(in_track_num == 0) {
 454                                         *error_message = "TRACK number must be greater than 0";
 455                                         return false;
 456                                 }
 457                                 if(is_cdda) {
 458                                         if(in_track_num > 99) {
 459                                                 *error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
 460                                                 return false;
 461                                         }
 462                                 }
 463                                 else {
 464                                         if(in_track_num == 255) {
 465                                                 *error_message = "TRACK number 255 is reserved for the lead-out";
 466                                                 return false;
 467                                         }
 468                                         else if(in_track_num > 255) {
 469                                                 *error_message = "TRACK number must be between 1 and 254, inclusive";
 470                                                 return false;
 471                                         }
 472                                 }
 473                                 if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
 474                                         *error_message = "CD-DA TRACK numbers must be sequential";
 475                                         return false;
 476                                 }
 477                                 /*@@@ search for duplicate track number? */
 478                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 479                                         *error_message = "TRACK is missing a track type after the track number";
 480                                         return false;
 481                                 }
 482                                 if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
 483                                         *error_message = "memory allocation error";
 484                                         return false;
 485                                 }
 486                                 cs->tracks[cs->num_tracks-1].number = in_track_num;
 487                                 cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
 488                                 in_index_num = -1;
 489                                 track_has_flags = false;
 490                                 track_has_isrc = false;
 491                         }
 492                         else if(0 == FLAC__STRCASECMP(field, "REM")) {
 493                                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 494                                         if(0 == strcmp(field, "FLAC__lead-in")) {
 495                                                 FLAC__int64 xx;
 496                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 497                                                         *error_message = "FLAC__lead-in is missing offset";
 498                                                         return false;
 499                                                 }
 500                                                 xx = local__parse_int64_(field);
 501                                                 if(xx < 0) {
 502                                                         *error_message = "illegal FLAC__lead-in offset";
 503                                                         return false;
 504                                                 }
 505                                                 if(is_cdda && xx % 588 != 0) {
 506                                                         *error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
 507                                                         return false;
 508                                                 }
 509                                                 cs->lead_in = (FLAC__uint64)xx;
 510                                         }
 511                                         else if(0 == strcmp(field, "FLAC__lead-out")) {
 512                                                 int track_num;
 513                                                 FLAC__int64 offset;
 514                                                 if(has_forced_leadout) {
 515                                                         *error_message = "multiple FLAC__lead-out commands";
 516                                                         return false;
 517                                                 }
 518                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 519                                                         *error_message = "FLAC__lead-out is missing track number";
 520                                                         return false;
 521                                                 }
 522                                                 track_num = local__parse_int_(field);
 523                                                 if(track_num < 0) {
 524                                                         *error_message = "illegal FLAC__lead-out track number";
 525                                                         return false;
 526                                                 }
 527                                                 forced_leadout_track_num = (unsigned)track_num;
 528                                                 /*@@@ search for duplicate track number? */
 529                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 530                                                         *error_message = "FLAC__lead-out is missing offset";
 531                                                         return false;
 532                                                 }
 533                                                 offset = local__parse_int64_(field);
 534                                                 if(offset < 0) {
 535                                                         *error_message = "illegal FLAC__lead-out offset";
 536                                                         return false;
 537                                                 }
 538                                                 forced_leadout_track_offset = (FLAC__uint64)offset;
 539                                                 if(forced_leadout_track_offset != lead_out_offset) {
 540                                                         *error_message = "FLAC__lead-out offset does not match end-of-stream offset";
 541                                                         return false;
 542                                                 }
 543                                                 has_forced_leadout = true;
 544                                         }
 545                                 }
 546                         }
 547                 }
 548         }
 549
 550         if(cs->num_tracks == 0) {
 551                 *error_message = "there must be at least one TRACK command";
 552                 return false;
 553         }
 554         else {
 555                 const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
 556                 if(
 557                         prev->num_indices == 0 ||
 558                         (
 559                                 is_cdda &&
 560                                 (
 561                                         (prev->num_indices == 1 && prev->indices[0].number != 1) ||
 562                                         (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
 563                                 )
 564                         )
 565                 ) {
 566                         *error_message = is_cdda?
 567                                 "previous TRACK must specify at least one INDEX 01" :
 568                                 "previous TRACK must specify at least one INDEX";
 569                         return false;
 570                 }
 571         }
 572
 573         if(!has_forced_leadout) {
 574                 forced_leadout_track_num = is_cdda? 170 : 255;
 575                 forced_leadout_track_offset = lead_out_offset;
 576         }
 577         if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
 578                 *error_message = "memory allocation error";
 579                 return false;
 580         }
 581         cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
 582         cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;
 583
 584         if(!feof(file)) {
 585                 *error_message = "read error";
 586                 return false;
 587         }
 588         return true;
 589 #undef FLAC__STRCASECMP
 590 }
 591
 592 FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, unsigned *last_line_read, unsigned sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
 593 {
 594         FLAC__StreamMetadata *cuesheet;
 595
 596         FLAC__ASSERT(0 != file);
 597         FLAC__ASSERT(0 != error_message);
 598         FLAC__ASSERT(0 != last_line_read);
 599
 600         *last_line_read = 0;
 601         cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);
 602
 603         if(0 == cuesheet) {
 604                 *error_message = "memory allocation error";
 605                 return 0;
 606         }
 607
 608         if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, sample_rate, is_cdda, lead_out_offset)) {
 609                 FLAC__metadata_object_delete(cuesheet);
 610                 return 0;
 611         }
 612
 613         return cuesheet;
 614 }
 615
 616 void grabbag__cuesheet_emit(FILE *file, const FLAC__StreamMetadata *cuesheet, const char *file_reference)
 617 {
 618         const FLAC__StreamMetadata_CueSheet *cs;
 619         unsigned track_num, index_num;
 620
 621         FLAC__ASSERT(0 != file);
 622         FLAC__ASSERT(0 != cuesheet);
 623         FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);
 624
 625         cs = &cuesheet->data.cue_sheet;
 626
 627         if(*(cs->media_catalog_number))
 628                 fprintf(file, "CATALOG %s\n", cs->media_catalog_number);
 629         fprintf(file, "FILE %s\n", file_reference);
 630
 631         for(track_num = 0; track_num < cs->num_tracks-1; track_num++) {
 632                 const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;
 633
 634                 fprintf(file, "  TRACK %02u %s\n", (unsigned)track->number, track->type == 0? "AUDIO" : "DATA");
 635
 636                 if(track->pre_emphasis)
 637                         fprintf(file, "    FLAGS PRE\n");
 638                 if(*(track->isrc))
 639                         fprintf(file, "    ISRC %s\n", track->isrc);
 640
 641                 for(index_num = 0; index_num < track->num_indices; index_num++) {
 642                         const FLAC__StreamMetadata_CueSheet_Index *index = track->indices + index_num;
 643
 644                         fprintf(file, "    INDEX %02u ", (unsigned)index->number);
 645                         if(cs->is_cd) {
 646                                 const unsigned logical_frame = (unsigned)((track->offset + index->offset) / (44100 / 75));
 647                                 unsigned m, s, f;
 648                                 grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
 649                                 fprintf(file, "%02u:%02u:%02u\n", m, s, f);
 650                         }
 651                         else
 652 #ifdef _MSC_VER
 653                                 fprintf(file, "%I64u\n", track->offset + index->offset);
 654 #else
 655                                 fprintf(file, "%llu\n", (unsigned long long)(track->offset + index->offset));
 656 #endif
 657                 }
 658         }
 659
 660 #ifdef _MSC_VER
 661         fprintf(file, "REM FLAC__lead-in %I64u\n", cs->lead_in);
 662         fprintf(file, "REM FLAC__lead-out %u %I64u\n", (unsigned)cs->tracks[track_num].number, cs->tracks[track_num].offset);
 663 #else
 664         fprintf(file, "REM FLAC__lead-in %llu\n", (unsigned long long)cs->lead_in);
 665         fprintf(file, "REM FLAC__lead-out %u %llu\n", (unsigned)cs->tracks[track_num].number, (unsigned long long)cs->tracks[track_num].offset);
 666 #endif
 667 }