/*
* NAME: genre->number()
* DESCRIPTION: translate an ID3v2 genre name/number to its ID3v1 index number
*/
int id3_genre_number(id3_ucs4_t const *string)
{
id3_ucs4_t const *ptr;
int i;
if (string == 0 || *string == 0)
return -1;
for (ptr = string; *ptr; ++ptr) {
if (*ptr < '0' || *ptr > '9')
break;
}
if (*ptr == 0) {
unsigned long number;
number = id3_ucs4_getnumber(string);
return (number <= 0xff) ? number : -1;
}
for (i = 0; i < NGENRES; ++i) {
if (compare(string, genre_table[i]))
return i;
}
/* no equivalent */
return -1;
}
/*
* NAME: v1->render()
* DESCRIPTION: render an ID3v1 (or ID3v1.1) tag
*/
static
id3_length_t v1_render(struct id3_tag const *tag, id3_byte_t *buffer)
{
struct id3_frame *frame;
unsigned int number, i;
if (buffer == 0)
return 128;
id3_render_immediate(&buffer, "TAG", 3);
v1_renderstr(tag, ID3_FRAME_TITLE, &buffer, 30);
v1_renderstr(tag, ID3_FRAME_ARTIST, &buffer, 30);
v1_renderstr(tag, ID3_FRAME_ALBUM, &buffer, 30);
v1_renderstr(tag, ID3_FRAME_YEAR, &buffer, 4);
v1_renderstr(tag, ID3_FRAME_COMMENT, &buffer, 30);
frame = id3_tag_findframe(tag, ID3_FRAME_TRACK, 0);
if (frame) {
number = id3_ucs4_getnumber(id3_field_getstrings(&frame->fields[1], 0));
if (number & 0xff) {
buffer[-2] = 0;
buffer[-1] = number;
}
}
frame = id3_tag_findframe(tag, ID3_FRAME_GENRE, 0);
number = frame ?
id3_ucs4_getnumber(id3_field_getstrings(&frame->fields[1], 0)) : 0xff;
id3_render_int(&buffer, number, 1);
/* make sure the tag is not empty */
buffer -= 128;
for (i = 3; i < 127; ++i) {
if (buffer[i] != ' ')
break;
}
return (i == 127 && buffer[127] == 0xff) ? 0 : 128;
}
/*
* NAME: genre->name()
* DESCRIPTION: translate an ID3v2 genre number/keyword to its full name
*/
id3_ucs4_t const *id3_genre_name(id3_ucs4_t const *string)
{
id3_ucs4_t const *ptr;
static id3_ucs4_t const genre_remix[] = { 'R', 'e', 'm', 'i', 'x', 0 };
static id3_ucs4_t const genre_cover[] = { 'C', 'o', 'v', 'e', 'r', 0 };
unsigned long number;
if (string == 0 || *string == 0)
return id3_ucs4_empty;
if (string[0] == 'R' && string[1] == 'X' && string[2] == 0)
return genre_remix;
if (string[0] == 'C' && string[1] == 'R' && string[2] == 0)
return genre_cover;
for (ptr = string; *ptr; ++ptr) {
if (*ptr < '0' || *ptr > '9')
return string;
}
number = id3_ucs4_getnumber(string);
return (number < NGENRES) ? genre_table[number] : string;
}
/*
* NAME: v1->render()
* DESCRIPTION: render an ID3v1 (or ID3v1.1) tag
*/
static
id3_length_t v1_render(struct id3_tag const *tag, id3_byte_t *buffer)
{
id3_byte_t data[128], *ptr;
struct id3_frame *frame;
unsigned int i;
int genre = -1;
ptr = data;
id3_render_immediate(&ptr, "TAG", 3);
v1_renderstr(tag, ID3_FRAME_TITLE, &ptr, 30);
v1_renderstr(tag, ID3_FRAME_ARTIST, &ptr, 30);
v1_renderstr(tag, ID3_FRAME_ALBUM, &ptr, 30);
v1_renderstr(tag, ID3_FRAME_YEAR, &ptr, 4);
v1_renderstr(tag, ID3_FRAME_COMMENT, &ptr, 30);
/* ID3v1.1 track number */
frame = id3_tag_findframe(tag, ID3_FRAME_TRACK, 0);
if (frame) {
unsigned int track;
track = id3_ucs4_getnumber(id3_field_getstrings(&frame->fields[1], 0));
if (track > 0 && track <= 0xff) {
ptr[-2] = 0;
ptr[-1] = track;
}
}
/* ID3v1 genre number */
frame = id3_tag_findframe(tag, ID3_FRAME_GENRE, 0);
if (frame) {
unsigned int nstrings;
nstrings = id3_field_getnstrings(&frame->fields[1]);
for (i = 0; i < nstrings; ++i) {
genre = id3_genre_number(id3_field_getstrings(&frame->fields[1], i));
if (genre != -1)
break;
}
if (i == nstrings && nstrings > 0)
genre = ID3_GENRE_OTHER;
}
id3_render_int(&ptr, genre, 1);
/* make sure the tag is not empty */
if (genre == -1) {
for (i = 3; i < 127; ++i) {
if (data[i] != ' ')
break;
}
if (i == 127)
return 0;
}
if (buffer)
memcpy(buffer, data, 128);
return 128;
}
