Technology > DVD Cutting Master Format Specification

5.0 VOBTBL.DAT/VOB Location Table

A VOB Location Table is a binary file used as a kind of file directory to specify the start and end sector addresses of files within a DVD Image Stream (D0 Data Stream) that are to have some sort of copy protection system applied. The file pointed to by a D5 DDVMS packet contains a header record of 16 bytes followed by one or more VOB Location records of 16 bytes each. In case of Dual Layer configuration, the VOB Location Table is recorded to the DVD CMF media which is prepared for each layer. That is the entries in the VOB Location Table file only point to the files or part of files that are on the same layer that the VOB Location Table file is with. Only the following files in the DVD Image Stream should be listed in the VOB Location Table file.

All files that are to have CSS applied

When the DVD Image stream is stored in 2048 byte sector format, then all files that are to have the CGMS bits in the CPR-MAI set without CP_SEC set.

When the DVD Image stream is stored in 2048 byte sector format, then all files that are to have CPPM applied.

Note: The entries in the VOB Location Table file point only to the part of the file that is present on the same layer that is with the VOB file. That is when the VOB Location Table file describes files on layer 0, it includes only the sector in the layer 0.

Header Record

The contents of the header record are listed in Table 5-1.

Table 5-1. The Header Record Contents

Byte

0-4

5-7

8-15

Name

VOB Header

Record Signature

VOB Location

Table Version

PAD(8)

VOB Header Record Signature

This field is used to identify a VOB Location Table file.

Usage: ‘VOBLT’ (56h 4Fh 42h 4Ch 54h)

VOB Location Table Version

This field identifies the version of the VOB Location Table file.

Usage: ‘1.0’ (31h 2Eh 30h)

PAD

This field is pad and should be filled with 00h.

VOB Location Record

The contents of each VOB Location record are listed Table 5-2.

This table is variable length.

Table 5-2. The VOB Location Record Contents

Byte	0	1	2	3-7	8-11	12-15
Name	Valid	VTS Number	VCPR_MAI	PAD(5)	Start Addr(4)	End Addr (4)

Valid

This field specifies if the VOB Location Table file is valid or not. All valid VOB records must be stored contiguously within the VOB Location Table file.

Valid =1 (01h) indicates that the record is valid for CSS processing.

= 2 (02h) indicates that the record is valid CGMS to be set but not CP_SEC.

= 3 (03h) indicates that the record is valid for the CPPM processing

Invalid records are only allowed at the end of the VOB location table. All valid records must be stored contiguously, starting from the first record.

VTS Number

If Valid = 01h, then this field a number from 0 (00h) to 100 (64h) that is used to identify the Video Manager, Video Title Set and Jacket Picture that contains the files that this record applies. Each number is specified as follows.

VTS # = 0 (00h) identifies Video Manager files

VTS # = 1 (01h) … 99 (63h) identifies Video Title Set files

VTS # = 100 (64h) identifies Jacket Picture files

If Valid = 02h, then this field shall contain 00h.

If Valid = 03h, then this field shall contain 00h.

VCPR_MAI

This field specifies the value for the first byte of the CPR_MAI field in the sectors of the VOB/AOB being described.

PAD

This field is pad and should be filled with 00h.

Start Addr

This field contains the DVD Sector Number for the first sector of the file. The value in this field is right justified. Sector numbers in Layer 1 of opposite path have the bit-inverted number. When a file is recorded continuously from the end of Layer 0 to the beginning of Layer 1 in case of Dual Layer configuration, Start Address of the file of Layer 1 shall be physical start address of the Layer 1. The value stored in this field shall be base 16.

Usage:

The sector address stored with msb in byte 8 and lsb in byte 11.

Example 1: the DVD Sector Number 030241 hex would be stored in the following table.

8

9

10

11

00h

03h

02h

41h

Example 2: On Layer 1 Opposite Track path, the DVD Sector Number FCEFF0 hex would be stored in the following table.

8	9	10	11
00h	FCh	EFh	F0h

End Addr

This field contains the DVD Sector Number for the end sector of the file. The value in this field is right justified Sector numbers in Layer 1 of opposite path have the bit-inverted number. When a file is recorded continuously from the end of Layer 0 to the beginning of Layer 1 in case of Dual Layer configuration, End Address of the file of Layer 0 shall be physical end address of the Layer 0. The value stored in this field shall be base 16.

Usage:

The sector address stored with msb in byte 8 and lsb in byte 11.

Example 1: the DVD Sector Number 035467 hex would be stored in the following table.

12	13	14	15
00h	03h	54h	67h

Example 2: On Layer 1 Opposite Track path, the DVD Sector Number FCEFF0 hex would be stored in the following table.

8	9	10	11
00h	FCh	Efh	F0h

____________________________________________________
Copyright© 2004, the DVD Forum | All Rights Reserved