Commit 40288f09 authored by Josh Coalson's avatar Josh Coalson
Browse files

finish cuesheet parser

parent b74fc98b
......@@ -36,7 +36,7 @@ GRABBAG_API void grabbag__cuesheet_frame_to_msf(unsigned frame, unsigned *minute
*minutes = frame;
}
/* since we only care about values >= 0 or error, returns < 0 for any illegal int, else value */
/* 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;
......@@ -54,6 +54,88 @@ static int local__parse_int_(const char *s)
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 '[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
*/
static FLAC__int64 local__parse_msf_(const char *s)
{
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 * 44100;
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');
else
return -1;
}
if(field >= 60)
return -1;
ret += field * 44100;
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 * (44100 / 75);
return ret;
}
static char *local__get_field_(char **s)
{
char *p;
......@@ -84,7 +166,7 @@ static char *local__get_field_(char **s)
return p;
}
static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__StreamMetadata *cuesheet, FLAC__bool check_cd_da_subset)
static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__StreamMetadata *cuesheet, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
{
#if defined _MSC_VER || defined __MINGW32__
#define FLAC__STRCASECMP stricmp
......@@ -92,11 +174,16 @@ static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message,
#define FLAC__STRCASECMP strcasecmp
#endif
char buffer[4096], *line, *field;
unsigned linelen;
int in_track = -1, in_index = -1;
unsigned linelen, 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, track_has_isrc, has_forced_leadout = false;
FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
while(0 != fgets(buffer, sizeof(buffer), file)) {
*last_line_read++;
(*last_line_read)++;
line = buffer;
linelen = strlen(line);
......@@ -107,56 +194,258 @@ static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message,
if(0 != (field = local__get_field_(&line))) {
if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
/*@@@@ error if already encountered CATALOG */
/*@@@@ check_cd_da_subset: 13 digits ['0'..'9'] */
if(disc_has_catalog) {
*error_message = "found multiple CATALOG commands";
return false;
}
if(0 == (field = local__get_field_(&line))) {
*error_message = "CATALOG is missing catalog number";
return false;
}
if(strlen(field) >= sizeof(cs->media_catalog_number)) {
*error_message = "CATALOG number is to 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;
}
strcpy(cs->media_catalog_number, field);
disc_has_catalog = true;
}
else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
/*@@@@ error if already encountered FLAGS in this track */
if(in_track < 0) {
/*@@@@*/
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;
}
if(in_index >= 0) {
/*@@@@*/
while(0 != (field = local__get_field_(&line))) {
if(0 == FLAC__STRCASECMP(field, "PRE"))
cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
}
/*@@@@ search for PRE flag only */
track_has_flags = true;
}
else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
if(in_track < 0) {
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;
}
/*@@@@ check_cd_da_subset: 0..99 */
/*@@@@ check_cd_da_subset: first index of first track is 00:00:00 */
/*@@@@ check first is 0 or 1 */
/*@@@@ check sequential */
/*@@@@ parse msf (or sample offset if !check_cd_da_subset)
if(0 == (field = local__get_field_(&line))) {
*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))) {
*error_message = "INDEX is missing an offset after the index number";
return false;
}
xx = local__parse_msf_(field);
if(xx < 0) {
if(is_cdda) {
*error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
return false;
}
xx = local__parse_int64_(field);
if(xx < 0) {
*error_message = "illegal INDEX offset";
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 > 0 && (FLAC__uint64)xx <= track->offset + track->indices[track->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 = track->offset - (FLAC__uint64)xx;
track->indices[track->num_indices-1].number = in_index_num;
}
else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
/*@@@@ error if already encountered ISRC in this track */
if(in_track < 0) {
/*@@@@*/
if(track_has_isrc) {
*error_message = "found multiple ISRC commands";
return false;
}
if(in_index >= 0) {
/*@@@@*/
if(in_track_num < 0 || in_index_num >= 0) {
*error_message = "FLAGS command must come after TRACK but before INDEX";
return false;
}
if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
*error_message = "invalid ISRC number";
return false;
}
strcpy(cs->tracks[cs->num_tracks-1].isrc, field);
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))) {
*error_message = "TRACK is missing track number";
return false;
}
in_track = local__parse_int_(field);
in_index = -1;
if(in_track <= 0) {
in_track_num = local__parse_int_(field);
if(in_track_num < 0) {
*error_message = "TRACK has invalid track number";
return false;
}
/*@@@@ check_cd_da_subset: 1..99 */
/*@@@@ check_cd_da_subset: sequential */
if(in_track_num == 0) {
*error_message = "TRACK number must be greater than 0";
return false;
}
if(is_cdda && in_track_num > 99) {
*error_message = "CD-DA TRACK number must be between 1 and 99, 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))) {
*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))) {
if(0 == strcmp(field, "FLAC__lead-in")) {
FLAC__int64 xx;
if(0 != (field = local__get_field_(&line))) {
*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))) {
*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 = (unsigned)track_num;
/*@@@@ search for duplicate track number? */
if(0 != (field = local__get_field_(&line))) {
*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;
}
if(!has_forced_leadout) {
forced_leadout_track_num = is_cdda? 170 : cs->num_tracks;
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;
......@@ -165,7 +454,7 @@ static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message,
#undef FLAC__STRCASECMP
}
GRABBAG_API FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__bool check_cd_da_subset)
GRABBAG_API FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, unsigned *last_line_read, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
{
FLAC__StreamMetadata *cuesheet;
......@@ -181,7 +470,7 @@ GRABBAG_API FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char
return 0;
}
if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, check_cd_da_subset)) {
if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, is_cdda, lead_out_offset)) {
FLAC__metadata_object_delete(cuesheet);
return 0;
}
......
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