JP2000268505A - Information recording medium, information recording / reproducing method, and information recording / reproducing system device - Google Patents

Abstract

(57) [Summary] [Problem] In a conventional file structure, when data required by an application is composed of a plurality of files, AV data is correctly reproduced by a user erroneously changing a file name. There is a problem that it takes time to access when the number of files is not increased or the number of files increases. SOLUTION: A main file structure area, a sub data structure area for managing sub data, and an object structure area for managing objects of sub data are provided, and a file system manages the data hierarchically, so that a plurality of data can be efficiently used. It is an object of the present invention to provide an information recording medium, an information recording / reproducing method, and an information recording / reproducing system apparatus which can be handled in a flexible manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium, an information recording / reproducing method, and an information recording / reproducing method for managing audio video (hereinafter referred to as AV) data and control data for reproducing the AV data by using a file structure. It relates to a system device.

[0002]

2. Description of the Related Art An optical disk is an information recording medium having a sector structure. 2. Description of the Related Art In recent years, higher densities, larger capacities, and multimedia have been advanced, and it is important to improve the access speed in order to interactively reproduce data using a plurality of data. In the case of a DVD-Video disc that realizes interactive video title playback, control data for controlling playback of AV data are recorded along with AV data composed of a plurality of MPEG program streams.

An example of a directory structure recorded on a DVD-Video disc and a relationship between AV data and control data will be described below with reference to a directory structure diagram of FIG. 9 and a data structure diagram of FIG. DVD-Video so that the DVD player can easily access the data.
The o file is recorded under a predetermined directory with a predetermined file name. That is, the Video directory 90 is located under the root directory 901.
2 is created, the DVD-Video file is given a predetermined name, and the
Recorded below. That is, the AV data 907 is Vi
deo. It is recorded as an AVD file 904, and its control data 906 is Video. This is recorded as an IFO file 903. The file File-A. Since the DAT 905 is recorded in a location other than the Video directory 902, the DVD player does not erroneously reproduce PC data.

Generally, AV data is composed of a plurality of video objects (hereinafter referred to as VOBs). In the example of FIG. 10, the AV data is composed of VOB # 1 and VOB # 2. V
OB # 1 and VOB # 2 are VOBs having different compression or coding conditions for video data and audio data. For example, VOB # 1 is AV data compressed by the MPEG1 method, and VOB # 2 is AV data compressed by MPEG2.
Data. On the other hand, the control data includes a program area for controlling the reproduction order of AV data and an area for managing information of each VOB. Each program specifies a VOB playback start address 1005 and a playback end address 1006. This designation is based on the VOB number of the AV data and its V
It is specified by the relative number of bytes from the head of OB. FIG.
0, program # 1 (hereinafter referred to as (P1)) 1
001 and (P2) 1002 are registered, P1 is a portion indicated by a broken line of VOB # 1 in FIG. 10, and P2 is a VOB
It is programmed to reproduce the portion indicated by the broken line of # 2. Information of each VOB is registered in 1003 and 1004, and information for performing a search by TV system, resolution, number of audio channels, compression system of video data and audio data, time designation, MP
Information for managing position information for each EG GOP (Group of Pictures) and the data size of the VOB are registered as information of each VOB. As described above, the application can read out the control data and interactively reproduce a plurality of VOB data by using a preset program.

Next, with reference to FIG. 8, an example of a data structure on a disk when these files are recorded on a rewritable disk using a volume file structure defined in ECMA167 will be described. The upper part of the volume space corresponds to the inner periphery of the disk, and the lower part corresponds to the outer periphery of the disk, and the logical sector numbers are allocated in sector units from the beginning of the volume space. Volume structure area 801
Is recorded with information for logically treating the disk as a volume, the position information of the space bitmap 821 and the file entry 82 of the root directory.
2 is also recorded. In addition, ECMA167
Although the file set descriptor is defined as a file structure in the standard, it is treated as a volume structure in this example to simplify the description. In general, access to each file is performed using a logical block number.
In this example, for simplicity, it is assumed that each file is accessed using a logical sector number. The file structure area 802 is an area in which a descriptor for defining a file structure is recorded. Note that the file structure area may be recorded in a distributed manner in the volume space. The space bitmap 821 is a bitmap that manages an area in the volume space where a file structure or data can be recorded on a sector-by-sector basis, and manages a recordable area including an unallocated area 805. File entry 822
Is a descriptor tag 851 indicating that this descriptor is a file entry, attribute information 852 for specifying attribute information of a file used by the file system such as recording date and time, and an allocation description for managing recording position information of the file or directory. Child 853. This allocation descriptor is an allocation descriptor 83
4 has the same data structure as above, and the extent area 865 and extent position information 866 are indicated using the leading logical sector number, with the continuous area in which data is recorded as an extent. A directory consists of one or more file identification descriptors, which are recorded for all subdirectories or files registered in that directory. The file identification descriptor 823 has a descriptor tag 85 indicating that this descriptor is a file identification descriptor.
4, a file name 855 specifying a file name or a directory name, and position information 856 of the file entry. The root directory 901 includes the Video directory 902 and the File-A. DAT file 905, each file identification descriptor 82
3,824 are recorded. Similarly, directories and files are managed by file identification descriptors and file entries 825 to 830.

Next, a method of managing AV data will be described. Generally, AV data is large in size, and its A
The V data is divided and recorded on the disk in a distributed manner. For example, average data rate 5Mbps (Mbit / sec)
If the AV data is recorded for 1 hour, it becomes 2 GB (G Byte). If such data is edited, deleted, or repeated recording of new data, the data recordable area on the disc is further dispersed, When recording AV data, the AV data is further divided and recorded in a recordable area as a plurality of extents. In FIG. 8, the intermediate extent of the VOB is not shown, but the AV data is divided into a plurality of pieces, and 837, 839,
Extents # 1 to #n indicated by 840 and 841 are recorded. Then, the position information of these extents is recorded in the allocation information area 803 using the allocation descriptor. An AV file has a larger number of allocation descriptors to be registered than other files.
Not all allocation descriptors can be stored in. For this reason, the allocation information area 803 stores the allocation information area position information 86 in the file entry 830 in order to further record the allocation descriptor.
Specified by 2. The allocation information area 803 has an allocation extension descriptor 831 at its head, and the allocation descriptor is registered immediately after that. The allocation extension descriptor 831 has a descriptor tag indicating that the descriptor is an allocation extension descriptor and a length 864 of the allocation descriptor registered immediately after the descriptor tag. Each allocation descriptor specifies each extent of AV data by the extent length 865 and the extent position information 866.

Next, a method of reproducing AV data based on a control data program will be described. The control data includes the VOB playback start address and the playback end address as A
It is specified by a relative address expression from the beginning of the V data. Therefore, when searching for the recording position of the AV data to be actually reproduced, the logical sector number is calculated while reading the allocation descriptor in the allocation information area 803. The playback start position is
It is obtained by sequentially adding the lengths of the extents registered in the allocation descriptor from the allocation descriptor 832. That is, when the added length matches the reproduction start position in the AV data, the logical sector number becomes the reproduction start position on the disk. The reproduction of the AV data is performed using the allocation descriptor following the logical sector number obtained. The reproduction end position is performed in the same manner as the calculation of the reproduction start position, and the reproduction of the AV data ends when the total length of the extents becomes equal to the reproduction end address.

Next, an example of editing AV data will be described. A
When the extent # 1 of the V data is deleted by editing, all the allocation descriptors in the allocation information area are read, the allocation descriptor 832 for managing the extent # 1 is deleted, and the allocation descriptor is newly stored on the disk. Be recorded.

[0009]

However, the directory structure of a DVD-Video disc as described above has a problem in that a user mistakenly uses a computer because data required by an application is composed of a plurality of files. , The directory name storing the DVD-Video file and its file name can be changed,
By moving or deleting certain files,
There is a problem that AV data is not reproduced correctly.

In order to define attribute information used by the file system such as recording date and time for each VOB,
B needs to be defined as one file. In this case, if the number of VOBs further increases, Video
o, the number of file identification descriptors registered in the directory increases, it takes time to search the video directory, and since each file entry must be read in order to access all the files, However, there is a problem that many memories are required.

In order to reproduce AV data, it is necessary to read all the allocation descriptors and calculate the logical sector number to be reproduced while adding the length of the extent. There was a problem of this.

In order to continuously reproduce AV data, it is necessary to read out all allocated descriptors on a memory and reproduce them. However, since there is no limit to the number of divisions when dividing AV data, When there are many allocation descriptors and a predetermined memory is used, there is a problem that AV data cannot be read continuously.

Also, VOBs are inserted into AV data,
When deleting a part, it is necessary to read out all the allocation descriptors on the memory and update the recording position information of the extent, and then record all the allocation descriptors on the disk again. There was a problem of this.

In view of the above problems, the present invention can handle each VOB data of AV data independently, and record and reproduce a plurality of data in one file by defining attribute information for each VOB. It is another object of the present invention to provide an information recording medium, an information recording / reproducing method, and an information recording / reproducing system device which can perform editing efficiently.

[0015]

In order to solve the above-mentioned problems, an information recording medium according to the present invention comprises a main file structure area for managing control data for reproducing AV data as main data, and a sub-file area for storing AV data. It has a sub-file structure area managed as data.

The sub-file structure area includes an allocation structure area for managing allocation information for each object data of AV data;
An object structure area for managing the recording position information of the allocation structure area may be included.

To solve the above problems, the information recording method of the present invention comprises a sub-file structure recording step of managing recorded AV data as sub-data, and a main file structure recording step of managing control data as main data. It is provided with.

[0018] The method may include a step of recording an allocation structure area for managing allocation information for each object data of the AV data, and a step of recording an object structure for managing position information of the allocation structure area.

In order to solve the above problems, an information reproducing method according to the present invention comprises: a step of reading control data based on information of a main file structure area; a step of reading allocation information of AV data from a sub file structure area; Reading AV data based on the allocation information.

Reading the position information of the allocation structure area of the object data from the object structure area;
Retrieving allocation information to be used from the allocation structure area.

In order to solve the above problems, an information recording system apparatus according to the present invention comprises a sub-file structure processing unit for creating a sub-file structure for managing AV data as sub-data, and a control data processing unit for creating control data. And main file structure processing means for creating a main file structure for managing control data as main data.

An allocation structure processing means for creating an allocation structure for managing allocation information for each object data of AV data, and an object structure processing means for creating an object structure for managing recording position information of the allocation structure may be provided. Good.

In order to solve the above-mentioned problems, an information reproducing system apparatus according to the present invention, comprising: a main file structure processing means for acquiring recording position information of the control data from information of a main file structure area; Control data processing means for acquiring reproduction information of the AV data, and sub-file structure processing means for acquiring allocation information of the AV data from a sub-file structure area.

An object structure processing means for obtaining position information of the allocation structure area of the object data from the object structure area based on the information of the sub-file structure area; and allocation information used from the allocation structure area based on the control data. May be provided.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As an embodiment of the present invention, an ECMA 16 is used by using an information recording medium for recording data in sector units, such as a DVD-RAM disk.
An information recording / reproducing system device for recording / reproducing a file managed using a file structure defined by the 7 standards and a data structure of the information recording medium will be described below with reference to the drawings.

FIG. 4 is a configuration diagram of an information recording / reproducing system device according to an embodiment of the present invention. A system control unit 401, an optical disk drive 407, an encoder 408, and a decoder 409 are connected via an I / O bus 406, and an AV signal input from a tuner 410 is converted into MPEG program stream data (hereinafter, referred to as AV data) by an encoder 408. The data is compressed by the system control unit, is subjected to predetermined processing, and is recorded on the optical disk drive 407. When reproducing AV data, the system control unit 40
Under the control of 1, predetermined data is read from the optical disk drive 407, the read AV data is converted into an AV signal by the decoder 409, and display and sound reproduction are performed by the TV 411. System control unit 4
Reference numeral 01 denotes a control data processing unit 402 which is realized by a microprocessor including a control program and an operation memory and processes control data for controlling reproduction of AV data, a control data memory 403 for holding the processing information, a file File system processing means 4 for processing structure information
04 and a file system memory 405 for holding the processing information. The memories 403 and 4
05 may use the same memory circuit by dividing the region. The control data has the data structure described in the conventional example,
The control data processing unit 402 includes a program processing unit 421 for processing a program and a VOB information processing unit 422 for processing VOB information. The control data memory 403 includes the program memory 431 and the VO
It comprises a B information memory 432. The file system processing unit 404 includes a file structure processing unit 441, a main file structure processing unit 442, and a sub-file structure processing unit 44.
3, an object structure processing unit 444, an allocation structure processing unit 445, a data recording unit 446, and a data reading unit 447. In order to hold information processed by these units, the file system memory 405 has a file structure Memory, memory 452 for object structure,
It is composed of an allocation structure memory 453 and a data structure memory 454.

FIG. 2 is a diagram showing the directory structure shown in FIG. DA
It is a data structure diagram at the time of recording only a T file. The volume space includes a volume structure area 101, a file structure area 102, an unallocated area 112, a data recording area 109, and an unallocated area 113. In the file structure area 102, a space bitmap 121, a file entry 122 of a root directory, a File
-A. A file entry 125 of the DAT file is recorded. In the data area 109, File-A. D
AT file data is recorded and file entry 1
25. The unallocated areas 112 and 113 where data can be recorded are managed by a space bitmap 121. Although not shown, in a general disk that is repeatedly used, the unallocated areas are dispersed in the volume space.

Based on the flowchart relating to the recording operation shown in FIG. 5, the AV data and its control data are recorded as one file on the information recording medium constructed as shown in FIG. The operation to be performed will be described. As shown in FIG. 3, this file is a Video. RTR file 3
02, and the control data is stored in the main data 306, A
The V data is recorded as sub data 307. The data structure after recording is shown in FIG. When the optical disk is inserted into the optical disk drive 407, the file system system processing unit 404 starts. At this time, the data read unit 447 is used to instruct the optical disk drive 407 to read the volume structure 121, and this information is read to the file structure memory. The file structure processing means 441 analyzes the volume structure and controls the file structure area 102 including the space bitmap 121 to be read out to the file structure memory 451. Next, the file structure processing means 441 recognizes the unallocated areas 112 and 113 from the space bitmap information and stores the file identification descriptor 1 in the root directory.
It is recognized that 23 is registered (unallocated area search step: S501).

Although not shown, when the user issues an instruction to start recording AV data to the system control unit, the tuner 410 sends the AV data via the encoder 408.
Data is recorded as extents # 1 to #i in predetermined areas of the unallocated areas 112 and 113. The VOB is treated as a unit that can be reproduced continuously, and the VOB is recorded in a preselected area so that the video is not interrupted during reproduction (VOB data recording step: S50).
3).

The VOB information processing means 442 includes the encoder 4
08, the parameters related to the compression of AV data, the data size of each GOP of MPEG, and the reproduction time information are stored in the VOB information memory 432, and the information of VOB # 1 of the control data is created (VOB information creation). Step: S504).

The allocation structure processing means 445 generates an allocation descriptor for managing the recording position information for each of the allocation expansion descriptor and the extents # 1 to #i (allocation structure generation step: S505).

The object structure processing means 444 creates, in the object structure memory 452, a stream identifier, the number of VOBs, the position information of the allocated structure area of the VOB, the length designated by the allocated structure area, and the VOB attribute information. The stream descriptor indicates that this VOB is a stream related to the moving image of MPEG2, and the position information of the allocation structure area of the VOB is the VOB created in the allocation structure creation step.
Designate the first logical sector number of the sector for recording the allocation structure for # 1. The length specified by the allocation structure area is
It indicates the size of the data specified by the allocation descriptor in the allocation structure area recorded in one sector, and is calculated as the sum of the lengths of the extents registered in each allocation descriptor. The attribute information of the VOB includes information as to whether or not this VOB is reproduced continuously with a previously registered VOB.
Information on whether data can be copied in units, VO
Information on the specifications of the player for playing B, VOB
The information of the average data rate and the maximum data rate is stored. As information relating to the specifications of the playback device for playing back the VOB, a buffer size of the playback device, a data reading rate for reading data from the disk, and performance information when the playback device accesses a predetermined sector are stored (object structure). Creation step: S506).

The VOB information processing means 422 stores a new VO
It is determined whether the recording of B is necessary. If the recording of the VOB is completed, the process proceeds to S511. If the recording of a new VOB is necessary, S506 to S506 are executed.
For example, if a news program is output from a tuner, this AV data is recorded as VOB # 1, and if the program is a baseball broadcast, this AV data is recorded as VOB # 2 (recording end determination of VOB data). Step: S5
02).

The VOB # 2 is allocated a new area capable of continuous reproduction and recorded as extents #j to #n, and the allocation structure information and the object structure information of the VOB # 2 are created in the same manner. (From S503 to S50
6).

After the VOB information processing means 422 confirms the recording of VOB # 2, the file system processing means 404 starts. The allocation structure processing means 445 includes an allocation structure memory 45.
3 is recorded in the allocation structure areas 106 and 107 (allocation structure recording step: S511).

Next, the object structure processing means 444 records the information in the object structure memory 451 as an object descriptor in the object structure area 108 (object structure recording step: S512).

The sub-file structure processing means 443 creates a sub-file structure in the file structure memory 541 and records it in the sub-file structure area 105 in order to manage the AV data and the object structure descriptor as sub data. Sub-file structure recording step: S513).

The program processing means 421 stores the recorded A
The user specifies a portion to be reproduced and a reproduction order in the V data, and generates a program in the program memory 431 (program information generation step: S514).

The control data processing means 402 records information in the program memory 431 and the VOB information memory 432 as control data in the main data area 104 (control data recording step: S515).

The main file structure processing means 442 stores the control data in Video. An extended file entry is created on the file structure memory 541 so as to be managed as the main data of the RTR file, recorded in the main file structure 103, and the file identification descriptor 1
Register 24.

Next, the data structure diagram shown in FIG. 1 and FIG.
The data structure of the information recording medium will be described with reference to the directory structure diagram shown in FIG. Video. The control data 306 of the RTR file 302 is recorded as main data in the main data area 104, and the position information of the control data is managed by the allocation descriptor 164 of the extended file entry 126 recorded in the main file area 103. The extended file entry 126 has a descriptor tag 161 indicating that the descriptor is an extended file entry, attribute information 162 specifying attribute information of a file managed by the extended file entry, and position information 163 of a stream directory file entry. And an allocation descriptor 164 for specifying the recording position information of the main data. The stream directory fill entry 128 composed of the file identification descriptors 129 and 130 is designated by the position information 163 of the stream directory file entry. The file identification descriptor includes a descriptor tag 165 indicating that the descriptor is a file identification descriptor, data identification information 166 identifying whether the data specified by the descriptor is user data or metadata, and a stream name. 167, and file entry position information 168. The file entry position information 168 specifies the file entry 132. Although not shown, this file entry 13
2 designates the position of the allocation structure area 106, not the recording position of the recorded data. AV
The extent in which the data is recorded is specified by the allocation descriptor recorded in the allocation structure area. Thus, AV
The data is divided and recorded as an extent in the sub-data area 105, and managed as sub-data by a descriptor recorded in the sub-file structure area 105. With these data structures, control data and AV data are recorded as main data and sub data, respectively, and can be handled as one file. Note that other data can be registered as user data in the stream directory. At this time, it is possible to identify whether the AV data is general data by using the extension of the stream name to be registered. For example, if the extension of the stream name is AVD, it can be recognized as AV data, and if it has any other extension, it can be identified as general data.
As described above, since the stream name registered as the sub data is managed as the sub data, when the computer handles this disc, the sub data is not displayed to the user. Therefore, it is possible to prevent the user from erroneously changing the stream name.

Next, the data structure of each object data constituting the sub data will be described. 181 of VOB # 1 constituting the AV data is recorded as extents # 1 to #i indicated by 144, 146 to 147, and
182 of B # 2 is recorded in extents #j to #n indicated by 148 to 149. The recording position information of these extents is assigned from the allocation descriptors 134, 135 to 1
36, 140 to 141. At this time, the allocation descriptor is registered so that the boundary of each VOB becomes the boundary of the extent. As described above, by managing the allocation descriptor for each VOB, the recording position of each VOB on the disc can be clearly identified. Furthermore, in order to manage the position information of the allocation extension descriptor for each VOB that guarantees continuous playback, when the allocation descriptor manages the head data of the VOB, an allocation structure area is newly provided. For example, VOB # 2
Is recorded in the allocation structure area 10 of VOB # 1.
6, an allocation descriptor 137 for specifying the head of the allocation structure area 107 of VOB # 2 and padding data composed of NULL data from immediately after to the end of the logical sector are recorded.
At the top of the allocation structure area 107, a new allocation extension descriptor 13
9 and immediately after that, allocation descriptors 140 to 141 for managing the recording position information of VOB # 2 and padding data 142 are recorded. With such an allocation structure area,
Clearly, a set of allocation descriptors can be managed for each VOB. On the other hand, an object structure descriptor for managing the object structure of the AV data is recorded as a file identification descriptor 130 in the stream directory. This file identification descriptor 139 has the same stream name as the file identification descriptor 129, and metadata is specified as data identification information. Due to these data structures, the file identification descriptor 130 is stored in the Video. It can indicate that metadata that describes the object structure of the AVD is managed. The file entry 131 specified by the file identification descriptor 130 specifies the recording position information of the object structure descriptor 143. The object structure descriptor 143 includes a stream identifier 170, the number 171 of VOBs, the position 172 of the allocation structure area of VOB # 1, the position 173 of the allocation structure area of VOB # 2, and the length of the VOB specified by the allocation structure area 106. 174, VOB length 1 specified by allocation structure area 107
75, and has attribute information 176 of VOB # 1 and attribute information 177 of VOB # 2. As described above, since the object structure descriptor can manage the number of objects of the data registered as sub-data in the stream directory and the allocation structure area of each object, the object structure descriptor does not need to be registered in the stream directory for each VOB. , The recording position information can be efficiently managed. This data structure is similar to the directory structure, but has the characteristic that access can be made faster than using a directory because necessary information can be specified compactly. In the case where access is performed by specifying a relative address from the beginning of the AV data, the relative address of the AV data can be roughly estimated by adding information on the length of the VOB specified by the allocation structure area. In, an allocation structure area including a specified relative address is selected by approximation, and an accurate relative address can be obtained by adding allocation descriptors in the selected allocation structure area. As described above, the relative address of the predetermined AV data can be calculated at a high speed by using the information on the length of the VOB designated by the allocation structure area.

The object structure descriptor may be recorded as attribute information of the file entry 132. At this time, since the object structure area is formed in the file entry, the speed of file access can be increased.

Next, the operation at the time of editing will be described. The allocation structure area is set for each VOB and also for each logical sector. When the first extent # 1 is deleted for editing the AV data, only the logical sector in the allocation structure area 106 needs to be rewritten, and there is no need to read and rewrite all the allocation descriptors. In this way, by allocating the allocation extension descriptor in units of logical sectors, the reading and recording processing of the allocation descriptor can be partially edited, and the number of accesses to the disk when editing data can be reduced. .

The operation of reproducing the AV data shown in FIG. 1 using the information recording / reproducing system apparatus shown in FIG. 4 will be described in accordance with the flowchart relating to the reproducing operation shown in FIG.

When the user issues a reproduction instruction, the file system system processing means 404 is first activated, and the data reading means 447 is used to instruct the optical disk drive 407 to read the volume structure 121. Read into the structural memory. The file structure processing means 441 analyzes the volume structure and controls the file structure area 102 to be read out to the file structure memory 451. Next, the file structure processing means 441 moves the
o. Search for an RTR file. Next, the main file structure processing means 442 reads the extension file entry 128 into the file structure memory 451, analyzes the position information of the control data, and stores the control data 127 in the data memory 454.
(Control data read step: S50)
1).

Next, the program processing means 421 transfers the program from the data memory 454 to the program memory 431, and selects a program specified by the user (program specification processing step: S602).

Next, the VOB information processing means 422 transfers the VOB information from the data memory 454 to the VOB information memory 432, and outputs the AV data corresponding to the program to be reproduced.
The relative address of the data is calculated (VOB information processing step: S603).

The sub-file structure processing means 443 analyzes the position information of the object structure descriptor, and reads out the object descriptor 143 to the object structure memory 452 (object structure reading step: S604).

The object structure processing means 444
Using the position information of the layout structure area B and the length of the VOB specified by the layout structure area, position information of the specified layout structure area is obtained (layout structure area search step: S60).
5).

The allocation structure processing means 445 calculates the AV data read start position and the end position by adding the extent length while reading the predetermined allocation descriptor from the obtained allocation structure area (allocation information). Reading step: S606).

The sub-file structure processing means 443 reads the AV data from the obtained read start position to the end position based on the position information specified in the allocation descriptor (AV data read step: S607).

As described above, when reproducing AV data, it is sufficient to read out a predetermined allocation descriptor for a specified VOB, and it is not necessary to read out all the allocation descriptors. At the time of recording, by limiting the allocation descriptor of VOBs to be continuously played back, the player only needs to have a memory of a specific size, and the cost of the device can be reduced. Also,
When a specific address is specified discontinuously as in the case of double speed or time search, the recording position information can be efficiently calculated using the object structure descriptor.
High-speed access is possible. Also, by using the attribute information of the VOB, it is possible to specify the specifications of the playback device, so that it is possible to determine whether or not the playback device to be played can play back the VOB.

A plurality of types of VOBs may be recorded in the stream directory. For example, recording may be performed for each recording date, or still images and moving images may be registered as different VOBs. Also, registration may be performed for each title.

(Embodiment 2) As an embodiment of the present invention, a data structure will be described with reference to FIG. When setting the allocation structure area, the allocation structure area is not set in a new logical sector for each VOB, but is set for each allocation descriptor. That is, VOB # 1 is recorded as extents 744, 746 to 747, and VOB # 2 is recorded as extents 748, 749 to 750. At this time, since the allocation descriptors can be recorded as much as possible in the logical sector, the number of logical sectors in which the allocation descriptors for all the AV data are recorded can be made smaller than in the first embodiment. Note that 733 to 738 is one logical sector, and 739 to 742 is one logical sector. At this time, the object structure descriptor 743 recorded in the object structure area 708
Is the position information 772, 773 of the VOB allocation structure area and the data position 774, 775 of the VOB specified by the allocation descriptor
For each VOB. Position information 7 of VOB allocation structure area
Reference numerals 72 and 773 designate position information using a logical sector number and the number of bytes from the head of the logical sector. By this designation, even if the layout structure area does not start from the head of the logical sector, its position information can be designated. The data position 774, 775 of the VOB specified by the allocation descriptor specifies the relative byte position of the data in the VOB specified by the allocation descriptor recorded first in each logical sector of the allocation structure area. This data structure can speed up the access in the VOB.

[0057]

According to the information recording medium of the present invention, a plurality of data can be recorded as one file while managing a plurality of data as a file structure by the main file structure and the sub file structure. For this reason, it is possible to reduce the possibility that a directory name or a file name is unexpectedly changed, and to prevent a file from being unexpectedly moved or deleted. Also, it is easy to move or copy a plurality of data as one file. Even if the number of VOBs increases, a predetermined allocation descriptor may be read, and the access is quick. Further, it is only necessary to read out the allocation extension descriptor of a predetermined size, and the cost of the device can be reduced. In addition, using a small-sized object structure descriptor, VOB
Attribute information can be managed for each. Also, since the allocation descriptor can be edited in logical sector units, the editability of the recorded data is high. In addition, the length of the allocation descriptor can be limited for continuous playback, and continuous playback is possible even with a small memory system.

[Brief description of the drawings]

FIG. 1 is a data structure diagram showing an area configuration in an information recording medium according to a first embodiment of the present invention.

FIG. 2 is a data structure diagram showing an area configuration in Embodiment 1 before recording AV data on an information recording medium of the present invention.

FIG. 3 is a directory structure diagram of a file according to the present invention.

FIG. 4 is a block diagram showing a configuration in an embodiment of an information recording / reproducing system apparatus of the present invention.

FIG. 5 is a flowchart illustrating a recording operation performed by the information recording / reproducing system device of the present invention.

FIG. 6 is a flowchart illustrating a reproducing operation performed by the information recording / reproducing system apparatus of the present invention.

FIG. 7 is a data structure diagram showing an area configuration in Embodiment 2 of the information recording medium of the present invention.

FIG. 8 is a data structure diagram showing an area configuration of a conventional information recording medium.

FIG. 9 is a diagram showing a conventional directory structure of a file.

FIG. 10 is a diagram showing a configuration of conventional control data and AV data.

[Explanation of symbols]

 102 file structure area 103 main file structure area 104 main data area 105 sub file structure area 106, 107, 706, 707 allocation structure area 107, 708 object structure area 143, 743 object structure descriptor 402 control data processing means 403 control data processing Memory 404 file system processing means 405 file system memory 421 program processing means 422 VOB information processing means 441 file structure processing means 442 main file structure processing means 443 sub-file structure processing means 444 object structure processing means 445 allocation structure processing means

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/92 (72) Inventor Nohisa Fukushima 1006 Ojidoma, Kazuma, Osaka Matsushita Electric Industrial Co., Ltd. F-term (Reference) 5C053 FA14 FA23 FA24 GA11 GB05 GB11 GB37 HA29 JA03 JA21 KA05 KA21 KA24 LA06 LA07 LA11 5D044 AB05 AB07 DE02 DE03 DE11 DE31 DE37 DE42 DE52

Claims (10)

[Claims] 1. An information recording medium in which recording and reproduction of data is performed in sector units, recording position information of data is managed as allocation information, and the data is recorded as a file using a file structure. It has a main file structure area for managing control data for reproducing data as main data and a sub file structure area for managing AV data as sub data, and records control data and AV data as one file. Information recording medium. 2. The AV data comprises a plurality of object data, and the sub-file structure area includes an allocation structure area for managing allocation information for each object data, and an object structure area for managing recording position information of the allocation structure area. 2. The information recording medium according to claim 1, wherein each object data of the AV data is structurally managed in one file. 3. An information recording medium in which data is recorded / reproduced on a sector basis, data recording position information is managed as allocation information, and the data is recorded as a file using a file structure. A recording method for recording AV data; a sub-file structure recording step of managing the recorded AV data as sub-data;
An information recording step of recording control data for reproducing data; and a main file structure recording step of managing the control data as main data, wherein the control data and the AV data are recorded as one file. Recording method. 4. The AV data comprises a plurality of object data, a step of recording an allocation structure area for managing allocation information for each object data, and a step of recording an object structure for managing position information of the allocation structure area. 4. The information recording method according to claim 3, wherein each object data of the AV data is structurally recorded in one file. 5. The method according to claim 1, wherein said control data is read out based on information in said main file structure area, and said sub file structure is read out based on said control data. A step of reading allocation information of AV data from the area; and a step of reading AV data based on the allocation information.
An information reproducing method characterized by reproducing AV data by accessing two files. 6. The method for reproducing an information recording medium according to claim 2, wherein said control data is read out based on information in said main file structure area, and an object is read out based on information in said sub-file structure area. Reading the position information of the allocation structure area of the object data from the structure area; searching for the allocation information to be used from the allocation structure area based on the control data; and performing AV based on the searched allocation information. Reading out data. 7. An information recording medium in which data is recorded / reproduced on a sector basis, data recording position information is managed as allocation information, and the data is recorded as a file using a file structure. A data recording unit, a sub-file structure processing unit for creating a sub-file structure for managing the recorded AV data as sub-data, and control data for reproducing the AV data. Information comprising: control data processing means; and main file structure processing means for creating a main file structure for managing the control data as main data, wherein the control data and the AV data are recorded as one file. Recording system equipment. 8. The AV data is composed of a plurality of object data, an allocation structure processing means for generating an allocation structure for managing allocation information for each object data, and an object structure for managing recording position information of the allocation structure. 8. The information recording system apparatus according to claim 7, further comprising: an object structure processing unit configured to record a file in which each object data of the AV data is structurally managed. 9. A system device for reproducing the information recording medium according to claim 1, wherein said data reading means and main file structure processing means for acquiring recording position information of said control data from information of said main file structure area. Control data processing means for obtaining reproduction information of the AV data based on the control data; and sub-file structure processing means for obtaining allocation information of the AV data from the sub-file structure area. Just access to AV
An information reproducing system apparatus for reproducing data. 10. A system device for reproducing an information recording medium according to claim 2, wherein: a data reading means; and a main file structure processing means for acquiring recording position information of the control data from information of the main file structure area. A control data processing means for obtaining reproduction information of the AV data based on the control data; and an object for obtaining position information of an allocation structure area of object data from an object structure area based on information of the sub-file structure area Structure processing means; and allocation structure processing means for acquiring allocation information to be used from the allocation structure area based on the control data, reproducing each object data of AV data by accessing only one file. An information reproducing system device characterized by performing: