claunia/flac
1
0
Fork 0
mirror of https://github.com/claunia/flac.git synced 2025-12-16 18:54:26 +00:00
Code Issues Packages Projects Releases Wiki Activity

add FLAC__metadata_get_cuesheet() and FLAC__metadata_object_cuesheet_calculate_cddb_id()

Browse Source
This commit is contained in:
Josh Coalson
2006-04-10 05:37:34 +00:00
parent 91018c8ef7
commit 7cfac0b146
8 changed files with 303 additions and 118 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
src/libFLAC/metadata_object.c
View File

@@ -1470,3 +1470,49 @@ FLAC_API FLAC__bool FLAC__metadata_object_cuesheet_is_legal(const FLAC__StreamMe
return FLAC__format_cuesheet_is_legal(&object->data.cue_sheet, check_cd_da_subset, violation);
}
static FLAC__uint64 get_index_01_offset_(const FLAC__StreamMetadata_CueSheet *cs, unsigned track)
{
if (track >= (cs->num_tracks-1) || cs->tracks[track].num_indices < 1)
return 0;
else if (cs->tracks[track].indices[0].number == 1)
return cs->tracks[track].indices[0].offset + cs->tracks[track].offset + cs->lead_in;
else if (cs->tracks[track].num_indices < 2)
return 0;
else if (cs->tracks[track].indices[1].number == 1)
return cs->tracks[track].indices[1].offset + cs->tracks[track].offset + cs->lead_in;
else
return 0;
}
static FLAC__uint32 cddb_add_digits_(FLAC__uint32 x)
{
FLAC__uint32 n = 0;
while (x) {
n += (x%10);
x /= 10;
}
return n;
}
FLAC_API FLAC__uint32 FLAC__metadata_object_cuesheet_calculate_cddb_id(const FLAC__StreamMetadata *object)
{
const FLAC__StreamMetadata_CueSheet *cs;
FLAC__ASSERT(0 != object);
FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_CUESHEET);
cs = &object->data.cue_sheet;
if (cs->num_tracks < 2) /* need at least one real track and the lead-out track */
return 0;
{
FLAC__uint32 i, length, sum = 0;
for (i = 0; i < (cs->num_tracks-1); i++) /* -1 to avoid counting the lead-out */
sum += cddb_add_digits_((FLAC__uint32)(get_index_01_offset_(cs, i) / 44100));
length = (FLAC__uint32)((cs->tracks[cs->num_tracks-1].offset+cs->lead_in) / 44100) - (FLAC__uint32)(get_index_01_offset_(cs, 0) / 44100);
return (sum % 0xFF) << 24 | length << 8 | (FLAC__uint32)(cs->num_tracks-1);
}
}