40cc6c892d40d20c861e066d8ba750f5a2f75676
[flac.git] / 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) 2011-2014  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 #ifdef 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         char buffer[4096], *line, *field;
246         unsigned forced_leadout_track_num = 0;
247         FLAC__uint64 forced_leadout_track_offset = 0;
248         int in_track_num = -1, in_index_num = -1;
249         FLAC__bool disc_has_catalog = false, track_has_flags = false, track_has_isrc = false, has_forced_leadout = false;
250         FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
251
252         FLAC__ASSERT(!is_cdda || sample_rate == 44100);
253         /* double protection */
254         if(is_cdda && sample_rate != 44100) {
255                 *error_message = "CD-DA cuesheet only allowed with 44.1kHz sample rate";
256                 return false;
257         }
258
259         cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
260         cs->is_cd = is_cdda;
261
262         while(0 != fgets(buffer, sizeof(buffer), file)) {
263                 (*last_line_read)++;
264                 line = buffer;
265
266                 {
267                         size_t linelen = strlen(line);
268                         if((linelen == sizeof(buffer)-1) && line[linelen-1] != '\n') {
269                                 *error_message = "line too long";
270                                 return false;
271                         }
272                 }
273
274                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
275                         if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
276                                 if(disc_has_catalog) {
277                                         *error_message = "found multiple CATALOG commands";
278                                         return false;
279                                 }
280                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
281                                         *error_message = "CATALOG is missing catalog number";
282                                         return false;
283                                 }
284                                 if(strlen(field) >= sizeof(cs->media_catalog_number)) {
285                                         *error_message = "CATALOG number is too long";
286                                         return false;
287                                 }
288                                 if(is_cdda && (strlen(field) != 13 || strspn(field, "0123456789") != 13)) {
289                                         *error_message = "CD-DA CATALOG number must be 13 decimal digits";
290                                         return false;
291                                 }
292                                 safe_strncpy(cs->media_catalog_number, field, sizeof(cs->media_catalog_number));
293                                 disc_has_catalog = true;
294                         }
295                         else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
296                                 if(track_has_flags) {
297                                         *error_message = "found multiple FLAGS commands";
298                                         return false;
299                                 }
300                                 if(in_track_num < 0 || in_index_num >= 0) {
301                                         *error_message = "FLAGS command must come after TRACK but before INDEX";
302                                         return false;
303                                 }
304                                 while(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
305                                         if(0 == FLAC__STRCASECMP(field, "PRE"))
306                                                 cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
307                                 }
308                                 track_has_flags = true;
309                         }
310                         else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
311                                 FLAC__int64 xx;
312                                 FLAC__StreamMetadata_CueSheet_Track *track = &cs->tracks[cs->num_tracks-1];
313                                 if(in_track_num < 0) {
314                                         *error_message = "found INDEX before any TRACK";
315                                         return false;
316                                 }
317                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
318                                         *error_message = "INDEX is missing index number";
319                                         return false;
320                                 }
321                                 in_index_num = local__parse_int_(field);
322                                 if(in_index_num < 0) {
323                                         *error_message = "INDEX has invalid index number";
324                                         return false;
325                                 }
326                                 FLAC__ASSERT(cs->num_tracks > 0);
327                                 if(track->num_indices == 0) {
328                                         /* it's the first index point of the track */
329                                         if(in_index_num > 1) {
330                                                 *error_message = "first INDEX number of a TRACK must be 0 or 1";
331                                                 return false;
332                                         }
333                                 }
334                                 else {
335                                         if(in_index_num != track->indices[track->num_indices-1].number + 1) {
336                                                 *error_message = "INDEX numbers must be sequential";
337                                                 return false;
338                                         }
339                                 }
340                                 if(is_cdda && in_index_num > 99) {
341                                         *error_message = "CD-DA INDEX number must be between 0 and 99, inclusive";
342                                         return false;
343                                 }
344                                 /*@@@ search for duplicate track number? */
345                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
346                                         *error_message = "INDEX is missing an offset after the index number";
347                                         return false;
348                                 }
349                                 /* first parse as minute:second:frame format */
350                                 xx = local__parse_msf_(field, sample_rate);
351                                 if(xx < 0) {
352                                         /* CD-DA must use only MM:SS:FF format */
353                                         if(is_cdda) {
354                                                 *error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
355                                                 return false;
356                                         }
357                                         /* as an extension for non-CD-DA we allow MM:SS.SS or raw sample number */
358                                         xx = local__parse_ms_(field, sample_rate);
359                                         if(xx < 0) {
360                                                 xx = local__parse_int64_(field);
361                                                 if(xx < 0) {
362                                                         *error_message = "illegal INDEX offset";
363                                                         return false;
364                                                 }
365                                         }
366                                 }
367                                 else if(sample_rate % 75 && xx) {
368                                         /* only sample zero is exact */
369                                         *error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
370                                         return false;
371                                 }
372                                 if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
373                                         *error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
374                                         return false;
375                                 }
376                                 if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
377                                         *error_message = "CD-DA INDEX offsets must increase in time";
378                                         return false;
379                                 }
380                                 /* fill in track offset if it's the first index of the track */
381                                 if(track->num_indices == 0)
382                                         track->offset = (FLAC__uint64)xx;
383                                 if(is_cdda && cs->num_tracks > 1) {
384                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
385                                         if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
386                                                 *error_message = "CD-DA INDEX offsets must increase in time";
387                                                 return false;
388                                         }
389                                 }
390                                 if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
391                                         *error_message = "memory allocation error";
392                                         return false;
393                                 }
394                                 track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
395                                 track->indices[track->num_indices-1].number = in_index_num;
396                         }
397                         else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
398                                 char *l, *r;
399                                 if(track_has_isrc) {
400                                         *error_message = "found multiple ISRC commands";
401                                         return false;
402                                 }
403                                 if(in_track_num < 0 || in_index_num >= 0) {
404                                         *error_message = "ISRC command must come after TRACK but before INDEX";
405                                         return false;
406                                 }
407                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
408                                         *error_message = "ISRC is missing ISRC number";
409                                         return false;
410                                 }
411                                 /* strip out dashes */
412                                 for(l = r = field; *r; r++) {
413                                         if(*r != '-')
414                                                 *l++ = *r;
415                                 }
416                                 *l = '\0';
417                                 if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
418                                         *error_message = "invalid ISRC number";
419                                         return false;
420                                 }
421                                 safe_strncpy(cs->tracks[cs->num_tracks-1].isrc, field, sizeof(cs->tracks[cs->num_tracks-1].isrc));
422                                 track_has_isrc = true;
423                         }
424                         else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
425                                 if(cs->num_tracks > 0) {
426                                         const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
427                                         if(
428                                                 prev->num_indices == 0 ||
429                                                 (
430                                                         is_cdda &&
431                                                         (
432                                                                 (prev->num_indices == 1 && prev->indices[0].number != 1) ||
433                                                                 (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
434                                                         )
435                                                 )
436                                         ) {
437                                                 *error_message = is_cdda?
438                                                         "previous TRACK must specify at least one INDEX 01" :
439                                                         "previous TRACK must specify at least one INDEX";
440                                                 return false;
441                                         }
442                                 }
443                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
444                                         *error_message = "TRACK is missing track number";
445                                         return false;
446                                 }
447                                 in_track_num = local__parse_int_(field);
448                                 if(in_track_num < 0) {
449                                         *error_message = "TRACK has invalid track number";
450                                         return false;
451                                 }
452                                 if(in_track_num == 0) {
453                                         *error_message = "TRACK number must be greater than 0";
454                                         return false;
455                                 }
456                                 if(is_cdda) {
457                                         if(in_track_num > 99) {
458                                                 *error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
459                                                 return false;
460                                         }
461                                 }
462                                 else {
463                                         if(in_track_num == 255) {
464                                                 *error_message = "TRACK number 255 is reserved for the lead-out";
465                                                 return false;
466                                         }
467                                         else if(in_track_num > 255) {
468                                                 *error_message = "TRACK number must be between 1 and 254, inclusive";
469                                                 return false;
470                                         }
471                                 }
472                                 if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
473                                         *error_message = "CD-DA TRACK numbers must be sequential";
474                                         return false;
475                                 }
476                                 /*@@@ search for duplicate track number? */
477                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
478                                         *error_message = "TRACK is missing a track type after the track number";
479                                         return false;
480                                 }
481                                 if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
482                                         *error_message = "memory allocation error";
483                                         return false;
484                                 }
485                                 cs->tracks[cs->num_tracks-1].number = in_track_num;
486                                 cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
487                                 in_index_num = -1;
488                                 track_has_flags = false;
489                                 track_has_isrc = false;
490                         }
491                         else if(0 == FLAC__STRCASECMP(field, "REM")) {
492                                 if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
493                                         if(0 == strcmp(field, "FLAC__lead-in")) {
494                                                 FLAC__int64 xx;
495                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
496                                                         *error_message = "FLAC__lead-in is missing offset";
497                                                         return false;
498                                                 }
499                                                 xx = local__parse_int64_(field);
500                                                 if(xx < 0) {
501                                                         *error_message = "illegal FLAC__lead-in offset";
502                                                         return false;
503                                                 }
504                                                 if(is_cdda && xx % 588 != 0) {
505                                                         *error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
506                                                         return false;
507                                                 }
508                                                 cs->lead_in = (FLAC__uint64)xx;
509                                         }
510                                         else if(0 == strcmp(field, "FLAC__lead-out")) {
511                                                 int track_num;
512                                                 FLAC__int64 offset;
513                                                 if(has_forced_leadout) {
514                                                         *error_message = "multiple FLAC__lead-out commands";
515                                                         return false;
516                                                 }
517                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
518                                                         *error_message = "FLAC__lead-out is missing track number";
519                                                         return false;
520                                                 }
521                                                 track_num = local__parse_int_(field);
522                                                 if(track_num < 0) {
523                                                         *error_message = "illegal FLAC__lead-out track number";
524                                                         return false;
525                                                 }
526                                                 forced_leadout_track_num = (unsigned)track_num;
527                                                 /*@@@ search for duplicate track number? */
528                                                 if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
529                                                         *error_message = "FLAC__lead-out is missing offset";
530                                                         return false;
531                                                 }
532                                                 offset = local__parse_int64_(field);
533                                                 if(offset < 0) {
534                                                         *error_message = "illegal FLAC__lead-out offset";
535                                                         return false;
536                                                 }
537                                                 forced_leadout_track_offset = (FLAC__uint64)offset;
538                                                 if(forced_leadout_track_offset != lead_out_offset) {
539                                                         *error_message = "FLAC__lead-out offset does not match end-of-stream offset";
540                                                         return false;
541                                                 }
542                                                 has_forced_leadout = true;
543                                         }
544                                 }
545                         }
546                 }
547         }
548
549         if(cs->num_tracks == 0) {
550                 *error_message = "there must be at least one TRACK command";
551                 return false;
552         }
553         else {
554                 const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
555                 if(
556                         prev->num_indices == 0 ||
557                         (
558                                 is_cdda &&
559                                 (
560                                         (prev->num_indices == 1 && prev->indices[0].number != 1) ||
561                                         (prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
562                                 )
563                         )
564                 ) {
565                         *error_message = is_cdda?
566                                 "previous TRACK must specify at least one INDEX 01" :
567                                 "previous TRACK must specify at least one INDEX";
568                         return false;
569                 }
570         }
571
572         if(!has_forced_leadout) {
573                 forced_leadout_track_num = is_cdda? 170 : 255;
574                 forced_leadout_track_offset = lead_out_offset;
575         }
576         if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
577                 *error_message = "memory allocation error";
578                 return false;
579         }
580         cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
581         cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;
582
583         if(!feof(file)) {
584                 *error_message = "read error";
585                 return false;
586         }
587         return true;
588 }
589
590 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)
591 {
592         FLAC__StreamMetadata *cuesheet;
593
594         FLAC__ASSERT(0 != file);
595         FLAC__ASSERT(0 != error_message);
596         FLAC__ASSERT(0 != last_line_read);
597
598         *last_line_read = 0;
599         cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);
600
601         if(0 == cuesheet) {
602                 *error_message = "memory allocation error";
603                 return 0;
604         }
605
606         if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, sample_rate, is_cdda, lead_out_offset)) {
607                 FLAC__metadata_object_delete(cuesheet);
608                 return 0;
609         }
610
611         return cuesheet;
612 }
613
614 void grabbag__cuesheet_emit(FILE *file, const FLAC__StreamMetadata *cuesheet, const char *file_reference)
615 {
616         const FLAC__StreamMetadata_CueSheet *cs;
617         unsigned track_num, index_num;
618
619         FLAC__ASSERT(0 != file);
620         FLAC__ASSERT(0 != cuesheet);
621         FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);
622
623         cs = &cuesheet->data.cue_sheet;
624
625         if(*(cs->media_catalog_number))
626                 fprintf(file, "CATALOG %s\n", cs->media_catalog_number);
627         fprintf(file, "FILE %s\n", file_reference);
628
629         for(track_num = 0; track_num < cs->num_tracks-1; track_num++) {
630                 const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;
631
632                 fprintf(file, "  TRACK %02u %s\n", (unsigned)track->number, track->type == 0? "AUDIO" : "DATA");
633
634                 if(track->pre_emphasis)
635                         fprintf(file, "    FLAGS PRE\n");
636                 if(*(track->isrc))
637                         fprintf(file, "    ISRC %s\n", track->isrc);
638
639                 for(index_num = 0; index_num < track->num_indices; index_num++) {
640                         const FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + index_num;
641
642                         fprintf(file, "    INDEX %02u ", (unsigned)indx->number);
643                         if(cs->is_cd) {
644                                 const unsigned logical_frame = (unsigned)((track->offset + indx->offset) / (44100 / 75));
645                                 unsigned m, s, f;
646                                 grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
647                                 fprintf(file, "%02u:%02u:%02u\n", m, s, f);
648                         }
649                         else
650                                 fprintf(file, "%" PRIu64 "\n", (track->offset + indx->offset));
651                 }
652         }
653
654         fprintf(file, "REM FLAC__lead-in %" PRIu64 "\n", cs->lead_in);
655         fprintf(file, "REM FLAC__lead-out %u %" PRIu64 "\n", (unsigned)cs->tracks[track_num].number, cs->tracks[track_num].offset);
656 }