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/* grabbag - Convenience lib for various routines common to several tools
* Copyright (C) 2002-2009 Josh Coalson
* Copyright (C) 2011-2016 Xiph.Org Foundation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#import <Foundation/Foundation.h>
#include <stdlib.h>
#include <string.h>
#include <FLAC/FLAC_assert.h>
#include <FLAC/all.h>
uint32_t grabbag__cuesheet_msf_to_frame(uint32_t minutes, uint32_t seconds, uint32_t frames) {
return ((minutes * 60) + seconds) * 75 + frames;
}
void grabbag__cuesheet_frame_to_msf(uint32_t frame, uint32_t *minutes, uint32_t *seconds, uint32_t *frames) {
*frames = frame % 75;
frame /= 75;
*seconds = frame % 60;
frame /= 60;
*minutes = frame;
}
#if 0
/* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
static int local__parse_int_(const char *s) {
int ret = 0;
char c;
if(*s == '\0')
return -1;
while('\0' != (c = *s++))
if(c >= '0' && c <= '9')
ret = ret * 10 + (c - '0');
else
return -1;
return ret;
}
/* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
static FLAC__int64 local__parse_int64_(const char *s) {
FLAC__int64 ret = 0;
char c;
if(*s == '\0')
return -1;
while('\0' != (c = *s++))
if(c >= '0' && c <= '9')
ret = ret * 10 + (c - '0');
else
return -1;
return ret;
}
/* 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
* return sample number or <0 for error
* WATCHOUT: if sample rate is not evenly divisible by 75, the resulting sample number will be approximate
*/
static FLAC__int64 local__parse_msf_(const char *s, uint32_t sample_rate) {
FLAC__int64 ret, field;
char c;
c = *s++;
if(c >= '0' && c <= '9')
field = (c - '0');
else
return -1;
while(':' != (c = *s++)) {
if(c >= '0' && c <= '9')
field = field * 10 + (c - '0');
else
return -1;
}
ret = field * 60 * sample_rate;
c = *s++;
if(c >= '0' && c <= '9')
field = (c - '0');
else
return -1;
if(':' != (c = *s++)) {
if(c >= '0' && c <= '9') {
field = field * 10 + (c - '0');
c = *s++;
if(c != ':')
return -1;
} else
return -1;
}
if(field >= 60)
return -1;
ret += field * sample_rate;
c = *s++;
if(c >= '0' && c <= '9')
field = (c - '0');
else
return -1;
if('\0' != (c = *s++)) {
if(c >= '0' && c <= '9') {
field = field * 10 + (c - '0');
c = *s++;
} else
return -1;
}
if(c != '\0')
return -1;
if(field >= 75)
return -1;
ret += field * (sample_rate / 75);
return ret;
}
/* 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
* return sample number or <0 for error
* WATCHOUT: depending on the sample rate, the resulting sample number may be approximate with fractional seconds
*/
static FLAC__int64 local__parse_ms_(const char *s, uint32_t sample_rate) {
FLAC__int64 ret, field;
double x;
char c, *end;
c = *s++;
if(c >= '0' && c <= '9')
field = (c - '0');
else
return -1;
while(':' != (c = *s++)) {
if(c >= '0' && c <= '9')
field = field * 10 + (c - '0');
else
return -1;
}
ret = field * 60 * sample_rate;
s++; /* skip the ':' */
if(strspn(s, "0123456789.") != strlen(s))
return -1;
x = strtod(s, &end);
if(*end || end == s)
return -1;
if(x < 0.0 || x >= 60.0)
return -1;
ret += (FLAC__int64)(x * sample_rate);
return ret;
}
static char *local__get_field_(char **s, FLAC__bool allow_quotes) {
FLAC__bool has_quote = false;
char *p;
FLAC__ASSERT(0 != s);
if(0 == *s)
return 0;
/* skip leading whitespace */
while(**s && 0 != strchr(" \t\r\n", **s))
(*s)++;
if(**s == 0) {
*s = 0;
return 0;
}
if(allow_quotes && (**s == '"')) {
has_quote = true;
(*s)++;
if(**s == 0) {
*s = 0;
return 0;
}
}
p = *s;
if(has_quote) {
*s = strchr(*s, '\"');
/* if there is no matching end quote, it's an error */
if(0 == *s)
p = *s = 0;
else {
**s = '\0';
(*s)++;
}
} else {
while(**s && 0 == strchr(" \t\r\n", **s))
(*s)++;
if(**s) {
**s = '\0';
(*s)++;
} else
*s = 0;
}
return p;
}
static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message, uint32_t *last_line_read, FLAC__StreamMetadata *cuesheet, uint32_t sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
{
char buffer[4096], *line, *field;
uint32_t forced_leadout_track_num = 0;
FLAC__uint64 forced_leadout_track_offset = 0;
int in_track_num = -1, in_index_num = -1;
FLAC__bool disc_has_catalog = false, track_has_flags = false, track_has_isrc = false, has_forced_leadout = false;
FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
FLAC__ASSERT(!is_cdda || sample_rate == 44100);
/* double protection */
if(is_cdda && sample_rate != 44100) {
*error_message = "CD-DA cuesheet only allowed with 44.1kHz sample rate";
return false;
}
cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
cs->is_cd = is_cdda;
while(0 != fgets(buffer, sizeof(buffer), file)) {
(*last_line_read)++;
line = buffer;
{
size_t linelen = strlen(line);
if((linelen == sizeof(buffer)-1) && line[linelen-1] != '\n') {
*error_message = "line too long";
return false;
}
}
if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
if(disc_has_catalog) {
*error_message = "found multiple CATALOG commands";
return false;
}
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
*error_message = "CATALOG is missing catalog number";
return false;
}
if(strlen(field) >= sizeof(cs->media_catalog_number)) {
*error_message = "CATALOG number is too long";
return false;
}
if(is_cdda && (strlen(field) != 13 || strspn(field, "0123456789") != 13)) {
*error_message = "CD-DA CATALOG number must be 13 decimal digits";
return false;
}
safe_strncpy(cs->media_catalog_number, field, sizeof(cs->media_catalog_number));
disc_has_catalog = true;
}
else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
if(track_has_flags) {
*error_message = "found multiple FLAGS commands";
return false;
}
if(in_track_num < 0 || in_index_num >= 0) {
*error_message = "FLAGS command must come after TRACK but before INDEX";
return false;
}
while(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
if(0 == FLAC__STRCASECMP(field, "PRE"))
cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
}
track_has_flags = true;
}
else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
FLAC__int64 xx;
FLAC__StreamMetadata_CueSheet_Track *track = &cs->tracks[cs->num_tracks-1];
if(in_track_num < 0) {
*error_message = "found INDEX before any TRACK";
return false;
}
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "INDEX is missing index number";
return false;
}
in_index_num = local__parse_int_(field);
if(in_index_num < 0) {
*error_message = "INDEX has invalid index number";
return false;
}
FLAC__ASSERT(cs->num_tracks > 0);
if(track->num_indices == 0) {
/* it's the first index point of the track */
if(in_index_num > 1) {
*error_message = "first INDEX number of a TRACK must be 0 or 1";
return false;
}
}
else {
if(in_index_num != track->indices[track->num_indices-1].number + 1) {
*error_message = "INDEX numbers must be sequential";
return false;
}
}
if(is_cdda && in_index_num > 99) {
*error_message = "CD-DA INDEX number must be between 0 and 99, inclusive";
return false;
}
/*@@@ search for duplicate track number? */
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "INDEX is missing an offset after the index number";
return false;
}
/* first parse as minute:second:frame format */
xx = local__parse_msf_(field, sample_rate);
if(xx < 0) {
/* CD-DA must use only MM:SS:FF format */
if(is_cdda) {
*error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
return false;
}
/* as an extension for non-CD-DA we allow MM:SS.SS or raw sample number */
xx = local__parse_ms_(field, sample_rate);
if(xx < 0) {
xx = local__parse_int64_(field);
if(xx < 0) {
*error_message = "illegal INDEX offset";
return false;
}
}
}
else if(sample_rate % 75 && xx) {
/* only sample zero is exact */
*error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
return false;
}
if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
*error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
return false;
}
if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
*error_message = "CD-DA INDEX offsets must increase in time";
return false;
}
/* fill in track offset if it's the first index of the track */
if(track->num_indices == 0)
track->offset = (FLAC__uint64)xx;
if(is_cdda && cs->num_tracks > 1) {
const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
*error_message = "CD-DA INDEX offsets must increase in time";
return false;
}
}
if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
*error_message = "memory allocation error";
return false;
}
track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
track->indices[track->num_indices-1].number = in_index_num;
}
else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
char *l, *r;
if(track_has_isrc) {
*error_message = "found multiple ISRC commands";
return false;
}
if(in_track_num < 0 || in_index_num >= 0) {
*error_message = "ISRC command must come after TRACK but before INDEX";
return false;
}
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
*error_message = "ISRC is missing ISRC number";
return false;
}
/* strip out dashes */
for(l = r = field; *r; r++) {
if(*r != '-')
*l++ = *r;
}
*l = '\0';
if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
*error_message = "invalid ISRC number";
return false;
}
safe_strncpy(cs->tracks[cs->num_tracks-1].isrc, field, sizeof(cs->tracks[cs->num_tracks-1].isrc));
track_has_isrc = true;
}
else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
if(cs->num_tracks > 0) {
const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
if(
prev->num_indices == 0 ||
(
is_cdda &&
(
(prev->num_indices == 1 && prev->indices[0].number != 1) ||
(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
)
)
) {
*error_message = is_cdda?
"previous TRACK must specify at least one INDEX 01" :
"previous TRACK must specify at least one INDEX";
return false;
}
}
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "TRACK is missing track number";
return false;
}
in_track_num = local__parse_int_(field);
if(in_track_num < 0) {
*error_message = "TRACK has invalid track number";
return false;
}
if(in_track_num == 0) {
*error_message = "TRACK number must be greater than 0";
return false;
}
if(is_cdda) {
if(in_track_num > 99) {
*error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
return false;
}
}
else {
if(in_track_num == 255) {
*error_message = "TRACK number 255 is reserved for the lead-out";
return false;
}
else if(in_track_num > 255) {
*error_message = "TRACK number must be between 1 and 254, inclusive";
return false;
}
}
if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
*error_message = "CD-DA TRACK numbers must be sequential";
return false;
}
/*@@@ search for duplicate track number? */
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "TRACK is missing a track type after the track number";
return false;
}
if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
*error_message = "memory allocation error";
return false;
}
cs->tracks[cs->num_tracks-1].number = in_track_num;
cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
in_index_num = -1;
track_has_flags = false;
track_has_isrc = false;
}
else if(0 == FLAC__STRCASECMP(field, "REM")) {
if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
if(0 == strcmp(field, "FLAC__lead-in")) {
FLAC__int64 xx;
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "FLAC__lead-in is missing offset";
return false;
}
xx = local__parse_int64_(field);
if(xx < 0) {
*error_message = "illegal FLAC__lead-in offset";
return false;
}
if(is_cdda && xx % 588 != 0) {
*error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
return false;
}
cs->lead_in = (FLAC__uint64)xx;
}
else if(0 == strcmp(field, "FLAC__lead-out")) {
int track_num;
FLAC__int64 offset;
if(has_forced_leadout) {
*error_message = "multiple FLAC__lead-out commands";
return false;
}
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "FLAC__lead-out is missing track number";
return false;
}
track_num = local__parse_int_(field);
if(track_num < 0) {
*error_message = "illegal FLAC__lead-out track number";
return false;
}
forced_leadout_track_num = (uint32_t)track_num;
/*@@@ search for duplicate track number? */
if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
*error_message = "FLAC__lead-out is missing offset";
return false;
}
offset = local__parse_int64_(field);
if(offset < 0) {
*error_message = "illegal FLAC__lead-out offset";
return false;
}
forced_leadout_track_offset = (FLAC__uint64)offset;
if(forced_leadout_track_offset != lead_out_offset) {
*error_message = "FLAC__lead-out offset does not match end-of-stream offset";
return false;
}
has_forced_leadout = true;
}
}
}
}
}
if(cs->num_tracks == 0) {
*error_message = "there must be at least one TRACK command";
return false;
}
else {
const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
if(
prev->num_indices == 0 ||
(
is_cdda &&
(
(prev->num_indices == 1 && prev->indices[0].number != 1) ||
(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
)
)
) {
*error_message = is_cdda?
"previous TRACK must specify at least one INDEX 01" :
"previous TRACK must specify at least one INDEX";
return false;
}
}
if(!has_forced_leadout) {
forced_leadout_track_num = is_cdda? 170 : 255;
forced_leadout_track_offset = lead_out_offset;
}
if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
*error_message = "memory allocation error";
return false;
}
cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;
if(!feof(file)) {
*error_message = "read error";
return false;
}
return true;
}
FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, uint32_t *last_line_read, uint32_t sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
{
FLAC__StreamMetadata *cuesheet;
FLAC__ASSERT(0 != file);
FLAC__ASSERT(0 != error_message);
FLAC__ASSERT(0 != last_line_read);
*last_line_read = 0;
cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);
if(0 == cuesheet) {
*error_message = "memory allocation error";
return 0;
}
if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, sample_rate, is_cdda, lead_out_offset)) {
FLAC__metadata_object_delete(cuesheet);
return 0;
}
return cuesheet;
}
#endif
void grabbag__cuesheet_emit(NSString **out, const FLAC__StreamMetadata *cuesheet, const char *file_reference) {
const FLAC__StreamMetadata_CueSheet *cs;
uint32_t track_num, index_num;
FLAC__ASSERT(0 != out);
FLAC__ASSERT(0 != cuesheet);
FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);
NSMutableArray *stringList = [[NSMutableArray alloc] init];
cs = &cuesheet->data.cue_sheet;
if(*(cs->media_catalog_number))
[stringList addObject:[NSString stringWithFormat:@"CATALOG %s\n", cs->media_catalog_number]];
[stringList addObject:[NSString stringWithFormat:@"FILE %s\n", file_reference]];
for(track_num = 0; track_num < cs->num_tracks - 1; track_num++) {
const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;
[stringList addObject:[NSString stringWithFormat:@" TRACK %02u %s\n", (uint32_t)track->number, track->type == 0 ? "AUDIO" : "DATA"]];
if(track->pre_emphasis)
[stringList addObject:@" FLAGS PRE\n"];
if(*(track->isrc))
[stringList addObject:[NSString stringWithFormat:@" ISRC %s\n", track->isrc]];
for(index_num = 0; index_num < track->num_indices; index_num++) {
const FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + index_num;
[stringList addObject:[NSString stringWithFormat:@" INDEX %02u ", (uint32_t)indx->number]];
if(cs->is_cd) {
const uint32_t logical_frame = (uint32_t)((track->offset + indx->offset) / (44100 / 75));
uint32_t m, s, f;
grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
[stringList addObject:[NSString stringWithFormat:@"%02u:%02u:%02u\n", m, s, f]];
} else
[stringList addObject:[NSString stringWithFormat:@"%" PRIu64 "\n", (track->offset + indx->offset)]];
}
}
[stringList addObject:[NSString stringWithFormat:@"REM FLAC__lead-in %" PRIu64 "\n", cs->lead_in]];
[stringList addObject:[NSString stringWithFormat:@"REM FLAC__lead-out %u %" PRIu64 "\n", (uint32_t)cs->tracks[track_num].number, cs->tracks[track_num].offset]];
*out = [stringList componentsJoinedByString:@""];
}
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