KR19990069334A - A disk on which AV pointer table information is recorded, and a method of reading data recorded therein - Google Patents

Abstract

A disk on which AV pointer table information is recorded, and a method of reading data recorded therein. In a disc having an additional area according to a predetermined file system format, audio / video (AV) pointer table information is recorded in the additional area as well as additional information, and a UDF file Even if the system information is lost, if the basic anchor volume descriptor pointer is not lost, it can be reproduced in a track unit, thereby improving the data reproduction capability.

Description

A disk on which AV pointer table information is recorded, and a method of reading data recorded therein

The present invention relates to a disc in which audio / video (AV) pointer table information is recorded on a disc for a predetermined file system, and a method of reading data recorded thereon.

In the case of a conventional DVD disc, it is configured as a file based on a UDF (Universal Disk Format) format. A file is described by a file entry that specifies the attributes of the file and the location of the data written to the file. This file entry may be referred to as an ICB (Infromation Control Block). Therefore, the file system largely consists of volume description information, ICB, and file data that describe the volume of file data.

The sector-by-sector lay-out in such a conventional DVD-Audio disc is as shown in FIG. In FIG. 1, it is assumed that there is an audio title set information (AUDIO_TS.IFO) file in an audio title set (AUDIO_TS) directory.

Step 1: Determine whether the disk is in the UDF format by reading the Volume Recognition Sequence in the volume recognition area starting from logical sector 16. Here, the volume recognition sequence includes Beginning Extended Area Descriptor (BEA), NSR, which is an identifier in the UDF format, and Terminating Extended Area Descriptor (TEA). In addition, the LBN shown in FIG. 1 is a logical block number, the LSN is a logical sector number, and the LBN has a relation (LBN = LSN-257) smaller by 257 than the LSN. The logical sector number LSN at which the logical block number LBN starts is not fixed and can be varied.

Step 2: Find the location of the Main Volume Descriptor Sequence by finding the Anchor Pointer Descriptor located at the anchor pointer. Here, a duplicate anchor pointer is written to the logical sector 256 and the last logical sector.

Step 3: Locate the file set descriptor by reading the logical sectors of the main volume descriptor sequence.

Step 4: Find the root directory by reading the file set descriptor.

Step 5: The location of the root directory and the length of the root directory define the location of the file entry. A file entry describes the data space and permissions of the root directory.

Step 6: Analyze the data in the root directory to find the audio title set (AUDIO_TS) directory. Read the file descriptor to find the location and length of the file entry that describes the audio title set directory.

Step 7: Audio Title Set (AUDIO_TS) Searches for a file entry describing the data space and permissions of the directory.

Step 8: Find the audio title set (AUDIO_TS) directory.

Step 9: Locate the file entry describing the data space and allowance of the audio title set information (AUDIO_TS.IFO) file.

If the contents of the audio title set information (AUDIO_TS.IFO) file is not lost on the DVD system based on the file system but the information of the file set descriptor is lost due to an external factor or the content of the root directory is lost, The audio title set information (AUDIO_TS.IFO) file could not be read because the directory could not be found.

In order to read data of a desired audio title set information (AUDIO_TS.IFO) file in the file system, the UDF file system volume area must be analyzed in a multistage manner as in the above procedure, so that the data access speed is slowed, there was. In addition, developers of DVD AV systems had a problem of handling the UDF.

In particular, DVD-AUDIO discs should be able to play the first song on a medium such as a regular CD that can be played back quickly. The lead-in area and the lead-out area could not be used, so that the concept of the simple audio playback pointer table (SAPTT) could not be applied.

In order to solve the above problems, an object of the present invention is to provide a disc in which AV pointer table information is added to a disc for a file system in order to realize quick reproduction.

Another object of the present invention is to provide a method of directly accessing and reading AV data recorded on a disc made of file system information by adding AV pointer table information to predetermined file system information There is.

It is still another object of the present invention to provide a method of adding AV pointer table information to predetermined file system information and accessing data recorded on a disk constituted of file system information appropriately to file system information .

In order to achieve the above object, the present invention provides a recording medium having an additional area according to a predetermined file system format, in which audio / video (AV) pointer table information as well as additional information is recorded in an additional area .

According to another aspect of the present invention, there is provided a method of reading data on a recording medium having an additional area according to a predetermined file system format, the method comprising: detecting an AV pointer table information And directly accessing the location where the AV information is recorded based on the detected AV pointer table information when the AV pointer table information is detected.

According to another aspect of the present invention, there is provided a method of reading data on a recording medium having an additional area according to a predetermined file system format, Determining whether the detected AV pointer table information is control information indicating the position of the AV information, and if the detected AV pointer table information is control information, determining the position of the AV information according to the control information And accessing the memory.

1 is a layout of a sector unit in a conventional DVD-Audio disk.

FIG. 2 is a sector-by-sector layout of a DVD-AUDIO disk to which AV pointer table information according to the present invention is added.

FIG. 3 is a table for explaining the structure of the anchor volume descriptor pointer shown in FIG. 2. FIG.

4 is a table for explaining the structure of the AV pointer table shown in FIG.

5 is a table for explaining the structure of the AV pointer information shown in FIG.

Hereinafter, a preferred embodiment of a disk on which AV pointer table information according to the present invention is recorded and a method of reading data recorded thereon will be described with reference to the accompanying drawings.

2, which is a sector-by-sector layout of a DVD-AUDIO disk on which AV pointer table information according to the present invention is recorded, is divided into first and second anchor pointer areas In addition to an anchor volume descriptor pointer, AV pointer table information is added and recorded.

3 is a table showing the structure of the anchor volume descriptor pointer shown in FIG. 3, BP indicates a byte position, and an anchor volume descriptor pointer is a total of 512 bytes, and includes 16 bytes indicating a Descriptor Tag that indicates whether an anchor pointer exists or not, a main volume descriptor sequence 8 bytes for the area location, 8 bytes for the reserve volume descriptor sequence area location, and reserved 480 bytes.

FIG. 4 is a table showing the structure of the AV pointer table shown in FIG. In Fig. 4, the AV pointer table is allocated to an area below the byte position 512 (hex 02 00) of the anchor volume descriptor pointer of the logical sector for the anchor pointer. Here, the logical sector is composed of 2048 bytes as an example. The RBP shown in FIG. 4 represents the relative byte position in the descriptor starting from 0, and LB 32 represents the 32-bit little endian representation unsigned number. Here, the multi-byte mathematical value specified by the UDF is written in the littele endian expression.

That is, the AV pointer table includes 16 bytes indicating the AV pointer table identifier, 2 bytes indicating the disk type, 2 bytes indicating the number of AV pointers (p), p indicating AV pointer information allocated depending on the number of AV pointers (p) * It consists of 12 bytes.

Here, the AV pointer table identifiers are # 41, # 56, # 20, # 50, # 6F, # 69, # 6E, # 74, # 65, # 72, # 20, # 54, # 61, # 62, 6C and # 65. If the disc type is "0", it indicates a DVD-MOVIE disc, and if it is "1", it indicates a DVD-AUDIO disc.

FIG. 5 is a table showing the structure of the AV pointer information shown in FIG. 4. The AV pointer information includes 4 bytes indicating the starting logical sector number of the AV information, 4 bytes indicating the block length of the AV information, 2 bytes indicating the AV information type, and 2 bytes indicating the AV information type. The cutting byte length indicates an invalid byte length in which AV information is not filled in the last sector in which AV information is recorded.

Therefore, the actual AV information byte length is given as follows.

Actual AV information length = AV information block length * block size - cutting byte length

If the AV information type is "0", it indicates an empty pointer. If the AV information type is "1", it indicates DVD-AUDIO SAPPTI (Simple Audio Play Table Information) MOVIE SVPPTI (Simple Video Play Table Information). Also, " 32768 " is used to indicate pointer table expansion, i.e., to indicate the logical sector number where the next AV pointer table is stored when a pointer table of one or more sectors is required.

Here, SAPPT is composed of one or more simple audio playback pointers, each SAPP is an information track presented by a simple audio player that plays only a linear PCM without using a program chain defined by a set of audio titles, and SAPPTI Represents information about this SAPPT. There is no fixed format for SVPPTI, but it may be needed for simple playback. In addition, the SVPPTI may include information for simultaneously instructing video and audio information for simple playback on a track basis.

If the MSB of the AV information type is " 0 ", it indicates the position where the actual AV information is recorded. If the MSB is " 1 ", it indicates an ICB (Infomation Control Block) indicating the position of the AV information. When the MSB is " 1 ", the block length of AV information in the pointer table information includes a partition start location. This ICB is included in the file entry shown in Fig.

On the other hand, an expression indicating " AV pointer table information may or may not be included in the sector in which the anchor volume descriptor pointer is recorded " is given as follows.

For example, in a DVD-AUDIO disk, when the SAPPTI starts in the logical sector 2048 and the AV information length is 15360 bytes, the following AV pointer table information is stored in the sector in which the anchor volume descriptor point is located. The number of single pointers is one.

That is, Starting LSN of AV Information = 2048

Block Length of AV Information = 8

Cutting Byte Length = 1024

When AV Information Type = 1,

Anchor Volume Descriptor Pointer

BYTE ADDR.

000 - 02 00 XX XX XX XX XX XX XX XX XX XX XX XX

010 - XX XX XX XX XX XX XX XX XX XX XX XX XX XX

.

.

.

AV Pointer Table

200 - 41 56 20 50 6F 69 6E 74 65 72 20 54 61 62 6C 65

Disc Type no.of Tracks TRACK_IFO.

210 - 00 00 01 00 00 08 00 00 08 00 00 00 00 00 04 01 00

.

.

.

7FO - XX XX XX XX XX XX XX XX XX XX XX XX XX XX

As another example, assuming that SAPPTI is recorded in a file on a DVD-AUDIO disk, the ICB of this file is started in the logical sector 2048, and the split start position is logical sector 1024, the sector in which the anchor volume descriptor pointer is located is the next AV Pointer table information is stored. The number of single pointers is one.

That is, Starting LSN of AV information = 2048

Block Length of AV information = 1024

Cutting Byte Length = 0

When AV Information Type = 32769,

Anchor Volume Descriptor Pointer

BYTE ADDR.

000 - 02 00 XX XX XX XX XX XX XX XX XX XX XX XX

010 - XX XX XX XX XX XX XX XX XX XX XX XX XX XX

.

.

.

AV Track Information Descriptor

200 - 41 56 20 50 6F 69 6E 74 65 72 20 54 61 62 6C 65

Disc Type no. of Tracks TRACK_IFO.

210 - 00 00 01 00 00 08 00 00 00 04 00 00 00 00 01 80

.

.

.

7FO - XX XX XX XX XX XX XX XX XX XX XX XX XX XX

The first method for reading data recorded on a disc in which AV pointer table information is added to the file system information proposed in the present invention is as follows.

Step 1: The anchor pointer area is searched to check whether an AV pointer table exists or not by checking an identifier indicating whether or not an AV pointer table exists.

Step 2: The AV pointer table is searched for the location where the AV pointer table is recorded, and it is judged whether or not the found AV pointer table directly indicates the location where the actual AV information is recorded. At this time, if the MSB of the AV information type in the AV pointer table is " 0 ", it indicates the location where the actual AV information is recorded, so that the MSB of the AV information type is checked. In the present invention, the AV information is recorded as an SAPPTI file or an SVPPTI file.

Step 3: The AV information stored in the determined recording position is read out.

A second method for reading data recorded on a disc to which AV pointer table information proposed in the present invention is added and recorded is as follows.

Step 1: The anchor pointer area is searched to check whether an AV pointer table exists or not by checking an identifier indicating whether or not an AV pointer table exists.

Step 2: The AV pointer table is searched for the location where the AV pointer table is recorded and it is determined whether the found AV pointer table indicates the ICB indicating the AV information location. At this time, if the MSB of the AV information type in the AV pointer table is " 1 ", it indicates the ICB indicating the position of the AV information, so that the MSB of the AV information type is checked.

Step 3: Find the actual location where AV information is recorded based on the determined ICB.

Step 4: Read the AV information stored at the found recording position.

The present invention can indicate AV information by storing pointer table information independent of the file system on a disc containing AV information in addition to a DVD-MOVIE / AUDIO disc. In addition, the present invention can be applied not only to a UDF format but also to a disk used in a file system having a format that does not accommodate a track structure such as FAT (File Allocation Table) and ISO (International Standard Organization) 9660, You can implement it by changing the location and format of the AV pointer table.

As described above, the present invention reduces the burden of handling a UDF file system for a DVD AV system developer by adding an AV pointer table suitable for a DVD AV system to a DVD disc for a file system of a predetermined format, (Or image reproduction) is possible.

Also, even if the information (file set descriptor, root directory) of the UDF file system for reading a file containing AV information is lost, the disk of the present invention can be reproduced in units of tracks if the basic anchor volume descriptor pointer is not lost. And the effect that the reliability of the system is improved and the data reading speed is increased.

Claims (17)

A recording medium having an additional area according to a predetermined file system format, the recording medium comprising: And audio / video (AV) pointer table information is recorded in the additional area as well as additional information. The disk according to claim 1, wherein the predetermined file system format is a universal disk format (UDF), the additional area is an anchor pointer area, and the additional information is an anchor volume descriptor pointer. 3. The disk according to claim 2, wherein the AV pointer table information comprises an AV pointer table identifier, a disk type, a number of AV pointers, and AV pointer information. 4. The disk according to claim 3, wherein the AV pointer information comprises a start position of AV information, a block length of AV information, an invalid byte length, and an AV information type. The disc according to claim 4, wherein the AV information type has at least DVD-AUDIO simple audio playback pointer table information (SAPPTI) and DVD-MOVIE simple video playback pointer table information (SVPPTI). 5. The method of claim 4, wherein if the predetermined bit of the AV information type indicates a first logical level, indicating an actual AV information recording position, and if the second logical level indicates an information control block indicating a position of the AV information Features disc. In a disc in which audio / video (A / V) information is recorded: Not only the A / V information but also audio / video (AV) pointer table information is recorded; The AV pointer table information includes an AV pointer table identifier, a disc type, a number of AV pointers, and AV pointer information. The AV pointer information includes a start position of AV information, a block length of AV information, an invalid byte length, . A method for reading data on a recording medium having an additional area according to a predetermined file system format, the method comprising: (a) searching for the additional area and detecting AV pointer table information; And (b) directly accessing the location where AV information is recorded based on the detected AV pointer table information when the AV pointer table information is detected. The method of claim 8, wherein the predetermined file system format is a universal disk format (UDF), the additional area is an anchor pointer area, and the additional information is an anchor volume descriptor pointer. 10. The disk according to claim 9, wherein the AV pointer table information comprises an AV pointer table identifier, a disk type, a number of AV pointers, and AV pointer information. The method according to claim 9, wherein the AV pointer information comprises a start position of AV information, a block length of AV information, an invalid byte length, and an AV information type. 12. The method of claim 11, wherein the AV information type includes DVD-AUDIO simple audio playback pointer table information (SAPPTI) and DVD-Video simple video playback pointer table information (SVPPTI). A method for reading data on a recording medium having an additional area according to a predetermined file system format, the method comprising: (a) searching for the additional area and detecting AV pointer table information; (b) if the AV pointer table information is detected, determining whether the detected pointer table information is control information indicating the position of the AV information; And (c) if the detected pointer table information is control information, accessing the position of AV information according to the control information. The method of claim 13, wherein the predetermined file system format is a UDF (Universal Disk Format), the additional area is an anchor pointer area, the additional information is an anchor volume descriptor pointer, . ≪ / RTI > 15. The disk according to claim 14, wherein the AV pointer table information comprises an AV pointer table identifier, a disk type, a number of AV pointers, and AV pointer information. 16. The reading method according to claim 15, wherein the AV pointer information comprises a start position of AV information, a block length of AV information, an invalid byte length, and an AV information type. 17. The reading method according to claim 16, wherein the AV pointer information comprises a start position of AV information, a block length of AV information, an invalid byte length, and an AV information type.