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New API call burn_disc_get_leadin_text()

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This commit is contained in:
Thomas Schmitt 2011-12-02 17:15:14 +00:00
parent 56c02fa394
commit 1d5ee82c16
6 changed files with 149 additions and 1 deletions
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2
cdrskin/cdrskin_timestamp.h
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@ -1 +1 @@
#define Cdrskin_timestamP "2011.12.02.100148"
#define Cdrskin_timestamP "2011.12.02.171436"

13
libburn/drive.c
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@ -3309,3 +3309,16 @@ int burn_disc_next_track_is_damaged(struct burn_drive *d, int flag)
}
/* ts B11201 : API */
/* Read the CD-TEXT data from the Lead-in of an Audio CD
*/
int burn_disc_get_leadin_text(struct burn_drive *d,
unsigned char **text_packs, int *num_packs,
int flag)
{
int ret;
ret = mmc_get_leadin_text(d, text_packs, num_packs, 0);
return ret;
}

57
libburn/libburn.h
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@ -1290,6 +1290,63 @@ int burn_disc_get_cd_info(struct burn_drive *d, char disc_type[80],
unsigned int *disc_id, char bar_code[9], int *app_code,
int *valid);
/* ts B11201 */
/** Read CD-TEXT packs from the Lead-in of an audio CD.
Each pack consists of 18 bytes, of which 4 are header. 12 bytes are pieces
of 0-terminated texts or binary data. 2 bytes hold a CRC.
See also MMC-3 Annex J.
The first byte of each pack tells the pack type (text meaning):
0x80 = Title
0x81 = Names of performers
0x82 = Songwriters
0x83 = Composers,
0x84 = Arrangers
0x85 = Messages
0x86 = text-and-binary: Disc Identification
0x87 = text-and-binary: Genre Identification
0x88 = binary: Table of Content information
0x89 = binary: Second Table of Content information
0x8e = UPC/EAN code of the album and ISRC code of each track
0x8f = binary: Size Information of the Block
The second byte tells the track number to which the first text piece in
a pack is associated. Number 0 means the whole album. Higher numbers are
valid for types 0x80 to 0x85, and 0x8e. There should be one text for each
track with these types.
The third byte is a sequential counter.
The fourth byte is the Block Number and Character Position Indicator.
It consists of three bit fields:
bit7 = Double Bytes Character Code (0= single byte characters)
bit4-6 = Block Number (groups text packs in language blocks)
bit0-3 = Character position
(Still obscure. MMC-3 Appendix J says:
"It is the number of character in the strings that belongs
to the Text Data Field in the previous Pack. The Character
Position starts from 0 to 15 and 15 indicates that the
first character belongs to the one before the previous
Pack. When the character code is double byte code, a set
of 2 bytes in the Text Data Field is counted at one."
)
The CRC bytes are optional. Polynomial is x^16 + x^12 + x^5 + 1.
@param d The drive to query.
@param text_packs Will point to an allocated memory buffer with CD-TEXT.
It will only contain text packs, and not be prepended
by the TOC header of four bytes, which gets stored with
file cdtext.dat by cdrecord -vv -toc. The first two of
these bytes are supposed hold the number of CD-TEXT
bytes + 2. The other two bytes are supposed to be 0.
Dispose this buffer by free(), when no longer needed.
@param num_packs Will tell the number of text packs, i.e. the number of
bytes in text_packs divided by 18.
@param flag Bitfield for control purposes,
Unused yet. Submit 0.
@return 1 success, 0= no CD-TEXT found, < 0 an error occured
@since 1.2.0
*/
int burn_disc_get_leadin_text(struct burn_drive *d,
unsigned char **text_packs, int *num_packs,
int flag);
/* ts B00924 */
/** Read the current usage of the eventual BD Spare Area. This area gets
reserved on BD media during formatting. During writing it is used to

1
libburn/libburn.ver
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@ -17,6 +17,7 @@ burn_disc_get_bd_spare_info;
burn_disc_get_cd_info;
burn_disc_get_format_descr;
burn_disc_get_formats;
burn_disc_get_leadin_text;
burn_disc_get_media_id;
burn_disc_get_msc1;
burn_disc_get_multi_caps;

72
libburn/mmc.c
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@ -174,6 +174,7 @@ static unsigned char MMC_GET_MSINFO[] =
static unsigned char MMC_GET_TOC[] = { 0x43, 2, 2, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_TOC_FMT0[] = { 0x43, 0, 0, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_ATIP[] = { 0x43, 2, 4, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_GET_LEADTEXT[] = { 0x43, 2, 5, 0, 0, 0, 0, 4, 0, 0 };
static unsigned char MMC_GET_DISC_INFO[] =
{ 0x51, 0, 0, 0, 0, 0, 0, 16, 0, 0 };
static unsigned char MMC_READ_CD[] = { 0xBE, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
@ -2028,6 +2029,77 @@ void mmc_read_disc_info(struct burn_drive *d)
}
/* @param flag bit= do not allocate text_packs
*/
static int mmc_get_leadin_text_al(struct burn_drive *d,
unsigned char **text_packs, int *alloc_len,
int flag)
{
struct buffer *buf = NULL;
struct command *c = NULL;
unsigned char *data;
int ret, data_length;
*text_packs = NULL;
BURN_ALLOC_MEM(buf, struct buffer, 1);
BURN_ALLOC_MEM(c, struct command, 1);
scsi_init_command(c, MMC_GET_LEADTEXT, sizeof(MMC_GET_LEADTEXT));
c->dxfer_len = *alloc_len;
c->opcode[7]= (c->dxfer_len >> 8) & 0xff;
c->opcode[8]= c->dxfer_len & 0xff;
c->retry = 1;
c->page = buf;
c->page->bytes = 0;
c->page->sectors = 0;
c->dir = FROM_DRIVE;
d->issue_command(d, c);
if (c->error)
{ret = 0; goto ex;}
data = c->page->data;
data_length = (data[0] << 8) + data[1];
*alloc_len = data_length + 2;
if (*alloc_len >= 22 && !(flag & 1)) {
BURN_ALLOC_MEM(*text_packs, unsigned char, *alloc_len - 4);
memcpy(*text_packs, data + 4, *alloc_len - 4);
}
ret = 1;
ex:;
BURN_FREE_MEM(c);
BURN_FREE_MEM(buf);
return ret;
}
/* ts B11201 */
/* Read the CD-TEXT data from the Lead-in of an Audio CD
*/
int mmc_get_leadin_text(struct burn_drive *d,
unsigned char **text_packs, int *num_packs, int flag)
{
int alloc_len = 4, ret;
*num_packs = 0;
if (mmc_function_spy(d, "mmc_get_leadin_text") <= 0)
return -1;
ret = mmc_get_leadin_text_al(d, text_packs, &alloc_len, 1);
if (ret <= 0 || alloc_len < 22)
return (ret > 0 ? 0 : ret);
ret = mmc_get_leadin_text_al(d, text_packs, &alloc_len, 0);
if (ret <= 0 || alloc_len < 22) {
if (*text_packs != NULL)
free(*text_packs);
*text_packs = NULL;
return (ret > 0 ? 0 : ret);
}
*num_packs = (alloc_len - 4) / 18;
return ret;
}
void mmc_read_atip(struct burn_drive *d)
{
struct buffer *buf = NULL;

5
libburn/mmc.h
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@ -115,4 +115,9 @@ int mmc_get_phys_format_info(struct burn_drive *d, int *disk_category,
char **book_name, int *part_version, int *num_layers,
int *num_blocks, int flag);
/* ts B11201 */
int mmc_get_leadin_text(struct burn_drive *d,
unsigned char **text_packs, int *num_packs, int flag);
#endif /*__MMC*/