src/share/grabbag/cuesheet.c

   1 /* grabbag - Convenience lib for various routines common to several tools
   2  * Copyright (C) 2002-2009  Josh Coalson
   3  * Copyright (C) 2011-2013  Xiph.Org Foundation
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 #  include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include "FLAC/assert.h"
  28 #include "share/compat.h"
  29 #include "share/grabbag.h"
  30 #include "share/safe_str.h"
  31
  32 unsigned grabbag__cuesheet_msf_to_frame(unsigned minutes, unsigned seconds, unsigned frames)
  33 {
  34         return ((minutes * 60) + seconds) * 75 + frames;
  35 }
  36
  37 void grabbag__cuesheet_frame_to_msf(unsigned frame, unsigned *minutes, unsigned *seconds, unsigned *frames)
  38 {
  39         *frames = frame % 75;
  40         frame /= 75;
  41         *seconds = frame % 60;
  42         frame /= 60;
  43         *minutes = frame;
  44 }
  45
  46 /* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
  47 static int local__parse_int_(const char *s)
  48 {
  49         int ret = 0;
  50         char c;
  51
  52         if(*s == '\0')
  53                 return -1;
  54
  55         while('\0' != (c = *s++))
  56                 if(c >= '0' && c <= '9')
  57                         ret = ret * 10 + (c - '0');
  58                 else
  59                         return -1;
  60
  61         return ret;
  62 }
  63
  64 /* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
  65 static FLAC__int64 local__parse_int64_(const char *s)
  66 {
  67         FLAC__int64 ret = 0;
  68         char c;
  69
  70         if(*s == '\0')
  71                 return -1;
  72
  73         while('\0' != (c = *s++))
  74                 if(c >= '0' && c <= '9')
  75                         ret = ret * 10 + (c - '0');
  76                 else
  77                         return -1;
  78
  79         return ret;
  80 }
  81
  82 /* 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
  83  * return sample number or <0 for error
  84  * WATCHOUT: if sample rate is not evenly divisible by 75, the resulting sample number will be approximate
  85  */
  86 static FLAC__int64 local__parse_msf_(const char *s, unsigned sample_rate)
  87 {
  88         FLAC__int64 ret, field;
  89         char c;
  90
  91         c = *s++;
  92         if(c >= '0' && c <= '9')
  93                 field = (c - '0');
  94         else
  95                 return -1;
  96         while(':' != (c = *s++)) {
  97                 if(c >= '0' && c <= '9')
  98                         field = field * 10 + (c - '0');
  99                 else
 100                         return -1;
 101         }
 102
 103         ret = field * 60 * sample_rate;
 104
 105         c = *s++;
 106         if(c >= '0' && c <= '9')
 107                 field = (c - '0');
 108         else
 109                 return -1;
 110         if(':' != (c = *s++)) {
 111                 if(c >= '0' && c <= '9') {
 112                         field = field * 10 + (c - '0');
 113                         c = *s++;
 114                         if(c != ':')
 115                                 return -1;
 116                 }
 117                 else
 118                         return -1;
 119         }
 120
 121         if(field >= 60)
 122                 return -1;
 123
 124         ret += field * sample_rate;
 125
 126         c = *s++;
 127         if(c >= '0' && c <= '9')
 128                 field = (c - '0');
 129         else
 130                 return -1;
 131         if('\0' != (c = *s++)) {
 132                 if(c >= '0' && c <= '9') {
 133                         field = field * 10 + (c - '0');
 134                         c = *s++;
 135                 }
 136                 else
 137                         return -1;
 138         }
 139
 140         if(c != '\0')
 141                 return -1;
 142
 143         if(field >= 75)
 144                 return -1;
 145
 146         ret += field * (sample_rate / 75);
 147
 148         return ret;
 149 }
 150
 151 /* 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
 152  * return sample number or <0 for error
 153  * WATCHOUT: depending on the sample rate, the resulting sample number may be approximate with fractional seconds
 154  */
 155 static FLAC__int64 local__parse_ms_(const char *s, unsigned sample_rate)
 156 {
 157         FLAC__int64 ret, field;
 158         double x;
 159         char c, *end;
 160
 161         c = *s++;
 162         if(c >= '0' && c <= '9')
 163                 field = (c - '0');
 164         else
 165                 return -1;
 166         while(':' != (c = *s++)) {
 167                 if(c >= '0' && c <= '9')
 168                         field = field * 10 + (c - '0');
 169                 else
 170                         return -1;
 171         }
 172
 173         ret = field * 60 * sample_rate;
 174
 175         s++; /* skip the ':' */
 176         if(strspn(s, "0123456789.") != strlen(s))
 177                 return -1;
 178         x = strtod(s, &end);
 179         if(*end || end == s)
 180                 return -1;
 181         if(x < 0.0 || x >= 60.0)
 182                 return -1;
 183
 184         ret += (FLAC__int64)(x * sample_rate);
 185
 186         return ret;
 187 }
 188
 189 static char *local__get_field_(char **s, FLAC__bool allow_quotes)
 190 {
 191         FLAC__bool has_quote = false;
 192         char *p;
 193
 194         FLAC__ASSERT(0 != s);
 195
 196         if(0 == *s)
 197                 return 0;
 198
 199         /* skip leading whitespace */
 200         while(**s && 0 != strchr(" \t\r\n", **s))
 201                 (*s)++;
 202
 203         if(**s == 0) {
 204                 *s = 0;
 205                 return 0;
 206         }
 207
 208         if(allow_quotes && (**s == '"')) {
 209                 has_quote = true;
 210                 (*s)++;
 211                 if(**s == 0) {
 212                         *s = 0;
 213                         return 0;
 214                 }
 215         }
 216
 217         p = *s;
 218
 219         if(has_quote) {
 220                 *s = strchr(*s, '\"');
 221                 /* if there is no matching end quote, it's an error */
 222                 if(0 == *s)
 223                         p = *s = 0;
 224                 else {
 225                         **s = '\0';
 226                         (*s)++;
 227                 }
 228         }
 229         else {
 230                 while(**s && 0 == strchr(" \t\r\n", **s))
 231                         (*s)++;
 232                 if(**s) {
 233                         **s = '\0';
 234                         (*s)++;
 235                 }
 236                 else
 237                         *s = 0;
 238         }
 239
 240         return p;
 241 }
 242
 243 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)
 244 {
 245 #if defined _MSC_VER || defined __MINGW32__
 246 #define FLAC__STRCASECMP stricmp
 247 #else
 248 #define FLAC__STRCASECMP strcasecmp
 249 #endif
 250         char buffer[4096], *line, *field;
 251         unsigned forced_leadout_track_num = 0;
 252         FLAC__uint64 forced_leadout_track_offset = 0;
 253         int in_track_num = -1, in_index_num = -1;
 254         FLAC__bool disc_has_catalog = false, track_has_flags = false, track_has_isrc = false, has_forced_leadout = false;
 255         FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
 256
 257         FLAC__ASSERT(!is_cdda || sample_rate == 44100);
 258         /* double protection */
 259         if(is_cdda && sample_rate != 44100) {
 260                 *error_message = "CD-DA cuesheet only allowed with 44.1kHz sample rate";
 261                 return false;
 262         }
 263
 264         cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
 265         cs->is_cd = is_cdda;
 266
 267         while(0 != fgets(buffer, sizeof(buffer), file)) {
 268                 (*last_line_read)++;
 269                 line = buffer;
 270
 271                 {
 272                         size_t linelen = strlen(line);
 273                         if((linelen == sizeof(buffer)-1) && line[linelen-1] != '\n') {
 274                                 *error_message = "line too long";
 275                                 return false;
 276                         }
 277                 }
 278
 279                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 280                         if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
 281                                 if(disc_has_catalog) {
 282                                         *error_message = "found multiple CATALOG commands";
 283                                         return false;
 284                                 }
 285                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
 286                                         *error_message = "CATALOG is missing catalog number";
 287                                         return false;
 288                                 }
 289                                 if(strlen(field) >= sizeof(cs->media_catalog_number)) {
 290                                         *error_message = "CATALOG number is too long";
 291                                         return false;
 292                                 }
 293                                 if(is_cdda && (strlen(field) != 13 || strspn(field, "0123456789") != 13)) {
 294                                         *error_message = "CD-DA CATALOG number must be 13 decimal digits";
 295                                         return false;
 296                                 }
 297                                 safe_strncpy(cs->media_catalog_number, field, sizeof(cs->media_catalog_number));
 298                                 disc_has_catalog = true;
 299                         }
 300                         else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
 301                                 if(track_has_flags) {
 302                                         *error_message = "found multiple FLAGS commands";
 303                                         return false;
 304                                 }
 305                                 if(in_track_num < 0 || in_index_num >= 0) {
 306                                         *error_message = "FLAGS command must come after TRACK but before INDEX";
 307                                         return false;
 308                                 }
 309                                 while(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 310                                         if(0 == FLAC__STRCASECMP(field, "PRE"))
 311                                                 cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
 312                                 }
 313                                 track_has_flags = true;
 314                         }
 315                         else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
 316                                 FLAC__int64 xx;
 317                                 FLAC__StreamMetadata_CueSheet_Track *track = &cs->tracks[cs->num_tracks-1];
 318                                 if(in_track_num < 0) {
 319                                         *error_message = "found INDEX before any TRACK";
 320                                         return false;
 321                                 }
 322                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 323                                         *error_message = "INDEX is missing index number";
 324                                         return false;
 325                                 }
 326                                 in_index_num = local__parse_int_(field);
 327                                 if(in_index_num < 0) {
 328                                         *error_message = "INDEX has invalid index number";
 329                                         return false;
 330                                 }
 331                                 FLAC__ASSERT(cs->num_tracks > 0);
 332                                 if(track->num_indices == 0) {
 333                                         /* it's the first index point of the track */
 334                                         if(in_index_num > 1) {
 335                                                 *error_message = "first INDEX number of a TRACK must be 0 or 1";
 336                                                 return false;
 337                                         }
 338                                 }
 339                                 else {
 340                                         if(in_index_num != track->indices[track->num_indices-1].number + 1) {
 341                                                 *error_message = "INDEX numbers must be sequential";
 342                                                 return false;
 343                                         }
 344                                 }
 345                                 if(is_cdda && in_index_num > 99) {
 346                                         *error_message = "CD-DA INDEX number must be between 0 and 99, inclusive";
 347                                         return false;
 348                                 }
 349                                 /*@@@ search for duplicate track number? */
 350                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 351                                         *error_message = "INDEX is missing an offset after the index number";
 352                                         return false;
 353                                 }
 354                                 /* first parse as minute:second:frame format */
 355                                 xx = local__parse_msf_(field, sample_rate);
 356                                 if(xx < 0) {
 357                                         /* CD-DA must use only MM:SS:FF format */
 358                                         if(is_cdda) {
 359                                                 *error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
 360                                                 return false;
 361                                         }
 362                                         /* as an extension for non-CD-DA we allow MM:SS.SS or raw sample number */
 363                                         xx = local__parse_ms_(field, sample_rate);
 364                                         if(xx < 0) {
 365                                                 xx = local__parse_int64_(field);
 366                                                 if(xx < 0) {
 367                                                         *error_message = "illegal INDEX offset";
 368                                                         return false;
 369                                                 }
 370                                         }
 371                                 }
 372                                 else if(sample_rate % 75 && xx) {
 373                                         /* only sample zero is exact */
 374                                         *error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
 375                                         return false;
 376                                 }
 377                                 if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
 378                                         *error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
 379                                         return false;
 380                                 }
 381                                 if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
 382                                         *error_message = "CD-DA INDEX offsets must increase in time";
 383                                         return false;
 384                                 }
 385                                 /* fill in track offset if it's the first index of the track */
 386                                 if(track->num_indices == 0)
 387                                         track->offset = (FLAC__uint64)xx;
 388                                 if(is_cdda && cs->num_tracks > 1) {
 389                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
 390                                         if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
 391                                                 *error_message = "CD-DA INDEX offsets must increase in time";
 392                                                 return false;
 393                                         }
 394                                 }
 395                                 if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
 396                                         *error_message = "memory allocation error";
 397                                         return false;
 398                                 }
 399                                 track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
 400                                 track->indices[track->num_indices-1].number = in_index_num;
 401                         }
 402                         else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
 403                                 char *l, *r;
 404                                 if(track_has_isrc) {
 405                                         *error_message = "found multiple ISRC commands";
 406                                         return false;
 407                                 }
 408                                 if(in_track_num < 0 || in_index_num >= 0) {
 409                                         *error_message = "ISRC command must come after TRACK but before INDEX";
 410                                         return false;
 411                                 }
 412                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 413                                         *error_message = "ISRC is missing ISRC number";
 414                                         return false;
 415                                 }
 416                                 /* strip out dashes */
 417                                 for(l = r = field; *r; r++) {
 418                                         if(*r != '-')
 419                                                 *l++ = *r;
 420                                 }
 421                                 *l = '\0';
 422                                 if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
 423                                         *error_message = "invalid ISRC number";
 424                                         return false;
 425                                 }
 426                                 safe_strncpy(cs->tracks[cs->num_tracks-1].isrc, field, sizeof(cs->tracks[cs->num_tracks-1].isrc));
 427                                 track_has_isrc = true;
 428                         }
 429                         else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
 430                                 if(cs->num_tracks > 0) {
 431                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
 432                                         if(
 433                                                 prev->num_indices == 0 ||
 434                                                 (
 435                                                         is_cdda &&
 436                                                         (
 437                                                                 (prev->num_indices == 1 && prev->indices[0].number != 1) ||
 438                                                                 (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
 439                                                         )
 440                                                 )
 441                                         ) {
 442                                                 *error_message = is_cdda?
 443                                                         "previous TRACK must specify at least one INDEX 01" :
 444                                                         "previous TRACK must specify at least one INDEX";
 445                                                 return false;
 446                                         }
 447                                 }
 448                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 449                                         *error_message = "TRACK is missing track number";
 450                                         return false;
 451                                 }
 452                                 in_track_num = local__parse_int_(field);
 453                                 if(in_track_num < 0) {
 454                                         *error_message = "TRACK has invalid track number";
 455                                         return false;
 456                                 }
 457                                 if(in_track_num == 0) {
 458                                         *error_message = "TRACK number must be greater than 0";
 459                                         return false;
 460                                 }
 461                                 if(is_cdda) {
 462                                         if(in_track_num > 99) {
 463                                                 *error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
 464                                                 return false;
 465                                         }
 466                                 }
 467                                 else {
 468                                         if(in_track_num == 255) {
 469                                                 *error_message = "TRACK number 255 is reserved for the lead-out";
 470                                                 return false;
 471                                         }
 472                                         else if(in_track_num > 255) {
 473                                                 *error_message = "TRACK number must be between 1 and 254, inclusive";
 474                                                 return false;
 475                                         }
 476                                 }
 477                                 if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
 478                                         *error_message = "CD-DA TRACK numbers must be sequential";
 479                                         return false;
 480                                 }
 481                                 /*@@@ search for duplicate track number? */
 482                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 483                                         *error_message = "TRACK is missing a track type after the track number";
 484                                         return false;
 485                                 }
 486                                 if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
 487                                         *error_message = "memory allocation error";
 488                                         return false;
 489                                 }
 490                                 cs->tracks[cs->num_tracks-1].number = in_track_num;
 491                                 cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
 492                                 in_index_num = -1;
 493                                 track_has_flags = false;
 494                                 track_has_isrc = false;
 495                         }
 496                         else if(0 == FLAC__STRCASECMP(field, "REM")) {
 497                                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 498                                         if(0 == strcmp(field, "FLAC__lead-in")) {
 499                                                 FLAC__int64 xx;
 500                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 501                                                         *error_message = "FLAC__lead-in is missing offset";
 502                                                         return false;
 503                                                 }
 504                                                 xx = local__parse_int64_(field);
 505                                                 if(xx < 0) {
 506                                                         *error_message = "illegal FLAC__lead-in offset";
 507                                                         return false;
 508                                                 }
 509                                                 if(is_cdda && xx % 588 != 0) {
 510                                                         *error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
 511                                                         return false;
 512                                                 }
 513                                                 cs->lead_in = (FLAC__uint64)xx;
 514                                         }
 515                                         else if(0 == strcmp(field, "FLAC__lead-out")) {
 516                                                 int track_num;
 517                                                 FLAC__int64 offset;
 518                                                 if(has_forced_leadout) {
 519                                                         *error_message = "multiple FLAC__lead-out commands";
 520                                                         return false;
 521                                                 }
 522                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 523                                                         *error_message = "FLAC__lead-out is missing track number";
 524                                                         return false;
 525                                                 }
 526                                                 track_num = local__parse_int_(field);
 527                                                 if(track_num < 0) {
 528                                                         *error_message = "illegal FLAC__lead-out track number";
 529                                                         return false;
 530                                                 }
 531                                                 forced_leadout_track_num = (unsigned)track_num;
 532                                                 /*@@@ search for duplicate track number? */
 533                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
 534                                                         *error_message = "FLAC__lead-out is missing offset";
 535                                                         return false;
 536                                                 }
 537                                                 offset = local__parse_int64_(field);
 538                                                 if(offset < 0) {
 539                                                         *error_message = "illegal FLAC__lead-out offset";
 540                                                         return false;
 541                                                 }
 542                                                 forced_leadout_track_offset = (FLAC__uint64)offset;
 543                                                 if(forced_leadout_track_offset != lead_out_offset) {
 544                                                         *error_message = "FLAC__lead-out offset does not match end-of-stream offset";
 545                                                         return false;
 546                                                 }
 547                                                 has_forced_leadout = true;
 548                                         }
 549                                 }
 550                         }
 551                 }
 552         }
 553
 554         if(cs->num_tracks == 0) {
 555                 *error_message = "there must be at least one TRACK command";
 556                 return false;
 557         }
 558         else {
 559                 const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
 560                 if(
 561                         prev->num_indices == 0 ||
 562                         (
 563                                 is_cdda &&
 564                                 (
 565                                         (prev->num_indices == 1 && prev->indices[0].number != 1) ||
 566                                         (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
 567                                 )
 568                         )
 569                 ) {
 570                         *error_message = is_cdda?
 571                                 "previous TRACK must specify at least one INDEX 01" :
 572                                 "previous TRACK must specify at least one INDEX";
 573                         return false;
 574                 }
 575         }
 576
 577         if(!has_forced_leadout) {
 578                 forced_leadout_track_num = is_cdda? 170 : 255;
 579                 forced_leadout_track_offset = lead_out_offset;
 580         }
 581         if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
 582                 *error_message = "memory allocation error";
 583                 return false;
 584         }
 585         cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
 586         cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;
 587
 588         if(!feof(file)) {
 589                 *error_message = "read error";
 590                 return false;
 591         }
 592         return true;
 593 #undef FLAC__STRCASECMP
 594 }
 595
 596 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)
 597 {
 598         FLAC__StreamMetadata *cuesheet;
 599
 600         FLAC__ASSERT(0 != file);
 601         FLAC__ASSERT(0 != error_message);
 602         FLAC__ASSERT(0 != last_line_read);
 603
 604         *last_line_read = 0;
 605         cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);
 606
 607         if(0 == cuesheet) {
 608                 *error_message = "memory allocation error";
 609                 return 0;
 610         }
 611
 612         if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, sample_rate, is_cdda, lead_out_offset)) {
 613                 FLAC__metadata_object_delete(cuesheet);
 614                 return 0;
 615         }
 616
 617         return cuesheet;
 618 }
 619
 620 void grabbag__cuesheet_emit(FILE *file, const FLAC__StreamMetadata *cuesheet, const char *file_reference)
 621 {
 622         const FLAC__StreamMetadata_CueSheet *cs;
 623         unsigned track_num, index_num;
 624
 625         FLAC__ASSERT(0 != file);
 626         FLAC__ASSERT(0 != cuesheet);
 627         FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);
 628
 629         cs = &cuesheet->data.cue_sheet;
 630
 631         if(*(cs->media_catalog_number))
 632                 fprintf(file, "CATALOG %s\n", cs->media_catalog_number);
 633         fprintf(file, "FILE %s\n", file_reference);
 634
 635         for(track_num = 0; track_num < cs->num_tracks-1; track_num++) {
 636                 const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;
 637
 638                 fprintf(file, "  TRACK %02u %s\n", (unsigned)track->number, track->type == 0? "AUDIO" : "DATA");
 639
 640                 if(track->pre_emphasis)
 641                         fprintf(file, "    FLAGS PRE\n");
 642                 if(*(track->isrc))
 643                         fprintf(file, "    ISRC %s\n", track->isrc);
 644
 645                 for(index_num = 0; index_num < track->num_indices; index_num++) {
 646                         const FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + index_num;
 647
 648                         fprintf(file, "    INDEX %02u ", (unsigned)indx->number);
 649                         if(cs->is_cd) {
 650                                 const unsigned logical_frame = (unsigned)((track->offset + indx->offset) / (44100 / 75));
 651                                 unsigned m, s, f;
 652                                 grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
 653                                 fprintf(file, "%02u:%02u:%02u\n", m, s, f);
 654                         }
 655                         else
 656                                 fprintf(file, "%" PRIu64 "\n", (track->offset + indx->offset));
 657                 }
 658         }
 659
 660         fprintf(file, "REM FLAC__lead-in %" PRIu64 "\n", cs->lead_in);
 661         fprintf(file, "REM FLAC__lead-out %u %" PRIu64 "\n", (unsigned)cs->tracks[track_num].number, cs->tracks[track_num].offset);
 662 }