New API call burn_disc_get_leadin_text()

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2011.12.02.100148"
+#define Cdrskin_timestamP "2011.12.02.171436"

libburn/drive.c

@@ -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;
+}
+

libburn/libburn.h

@@ -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

libburn/libburn.ver

@@ -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;

libburn/mmc.c

@@ -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;

libburn/mmc.h

@@ -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*/