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