JP2001076468A - Information recording medium, information recording and reproducing system device, and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to control a data rate every regions in which AV data is recorded and to enable to perform efficiently edition of AV data guaranteeing continuity of AV data by comprising first and second extent in which one part of first and second AV data is recorded having in which at least, one of continued regions in a data region has first and second attribute. SOLUTION: A data structure 100 indicates a physical continuous region for reproducing AV data. When AV data 183 is recorded, an optical disk drive retrieves an empty region of which magnitude is larger than the prescribed magnitude so that AV data 183 is reproduced continuously by information of a space bit map 121, and registers AV data regions 105...110 in a memory for AV allotting structure. And VOB181 and 182 are registered in extent 137-141 and 142. At the time, extent 141, 142 are physically continuous region, but extent is divided into extent 141 and 142 at a boundary of VOB 181 and 182.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an information recording medium, an information recording / reproducing system apparatus, and an information recording / reproducing method for managing AV (audio video) data in a file structure.

[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-Vid so that DVD players can easily access the data.
The eo file is recorded under a predetermined directory with a predetermined file name. That is, the video directory 9 is located under the root directory 901.
02 is created.

[0004] The DVD-Video file 908 contains A
V data 907 and control data 906 are included. The AV data 907 and the control data 906 are recorded under the Video directory 902. That is, the AV data 9
07 is Video. 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. DAT905 is Video
Since it is recorded in a place other than the directory 902, the DV
There is no possibility that the D player erroneously reproduces PC data.

Generally, the AV data 907 is composed of a plurality of video objects (hereinafter, referred to as VOBs). In the example of FIG. 10, the AV data 907 is composed of VOB1009 and VOB1.
010. VOB 1009 and VOB 1010 are VOBs having different compression or coding conditions for video data and audio data. For example, VOB
Reference numeral 1009 denotes AV data of a news program compressed by the MPEG1 system, and VOB 1010 denotes AV data of a baseball broadcast program compressed by MPEG2. On the other hand, control data 9
Reference numeral 06 includes a program 1011 for controlling reproduction of the AV data 907 and VOB management information 1012 for managing information of each VOB. The program 1011 is composed of VOB1
009, a program 1001 for controlling reproduction,
1010 and a program 1002 for controlling reproduction.

The programs 1001 and 1002 are VOB
Playback start address 1005 and playback end address 100
Specify 6. Playback start address 1005, 1006
Is specified by the identification information of each VOB 1009 and 1010 of the AV data 907 and the relative number of bytes from the head of each VOB 1009 and 1010. In the example of FIG. 10, a program 1001 and a program 1002 are registered, and the program 1001 is programmed to reproduce the portion 1007 of the VOB 1009, and the program 1002 is programmed to reproduce the portion 1008 of the VOB 1010. In this manner, the program data can be partially reproduced by designating the reproduction start address and the reproduction end address of the VOB.

[0007] The VOB management information 1012 contains the VOB100
VOB management information 1003 for managing the information of
VOB management information 1004 for managing the information of 1010. The VOB management information 1003 and 1004 respectively include a TV system, a resolution, the number of audio channels, a compression system of video data and audio data, information for performing a search by designating a time, and an MPEG GOP
The information for managing the position information in units of (group of pictures) and the data size of the VOB
B information is included. As described above, the application software for reproducing the DVD-Video disc on which the information having the directory structure and the data structure shown in FIGS. 9 and 10 is recorded reads out the control data 906 and uses the preset program to execute the interactive program. Can reproduce a plurality of VOBs.

With reference to FIG. 7, the correspondence between the physical structure of a DVD-RAM disc, which is a rewritable optical disc, and a logical volume space will be described. FIG. 7A shows the DV.
FIG. 3 is a diagram showing a physical structure of a D-RAM disk 700, and a DV
The D-RAM disk 700 has a lead-in area 701 from the inner periphery, and a DMA (Defe) for managing defects on the disk.
ct Management Area) area 702,
It comprises a data area 718 and a lead-out area 716.
Digital data is recorded in each area, and the digital data is managed in units called sectors. Data area 7
Reference numeral 18 further includes a spare area 703 for replacing defective sectors and an area 719 from zone 0 to zone 47. In each zone, data is recorded in physical sector units of 2048 bytes.

Referring to FIG. 7B, a physical sector number (PSN:
Physical Sector Number) is assigned, and the physical space 717 of the disk 700 is specified by the PSN. On the other hand, the space in which user data can be recorded is a logical sector number (LSN:
Logical Sector Number) is defined as a volume space 720 to which a logical sector number is assigned. That is, the volume space 720 is divided from the physical space 717 by the lead-in area 701, the DMA area 702, and the spare area 70.
3. Defective sector 711, guard area 715 between each zone
And the space excluding the lead-out area 716. The defective sector 711 is a defective sector detected by performing a certify process when the disk 700 is initialized. The PSN of this defective sector 711 is the DMA area 70
2 PDL (Primary Defect Lis)
t) (not shown) is registered and managed. A defective sector 721 detected during recording of data on the disk 700 is replaced with a spare area 703 by a linear replacement method and replaced with an SDL (Se) in the DMA 702.
Condary Defect List) (not shown).

Next, an example of a data structure when these files are recorded on a rewritable disk 700 using a volume file structure 800 defined in the ECMA167 standard will be described with reference to FIG. The upper side of the figure shows the inner circumferential side of the disk 700, and the lower side shows the disk 70.
The logical sector number (LSN) is allocated in sector units from the beginning of the volume space 720. The volume structure area 801 records information for logically treating the disk 700 as a volume, and also records the position information of the space bitmap 821 and the position information of the file entry 822 of the root directory. Although the file set descriptor is defined as a file structure in the ECMA167 standard,
In this example, the volume structure is used to simplify the description. In general, access to each file is performed using a logical block number. However, in this example, for simplification, each file is assumed to be 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 dispersedly recorded in the volume space 720. The space bitmap 821 is a bitmap for managing a free area in the volume space 720 to which a file structure or data can be allocated in units of sectors, and has position information of unallocated areas 805 and 807. The file entry 822 has a descriptor tag 85 indicating that this descriptor is a file entry.
1. Attribute information 852 that specifies the attribute information of the file used by the file system such as the recording date and time, and the allocation descriptor 853 that manages the recording position information of the file or directory.
Consists of The allocation descriptor 853 has the same data structure as the allocation descriptor 834. A continuous area in which data is recorded is called an extent, and the extent has a length of 865.
And its start position 866.

A directory consists of one or more file identification descriptors, and the file identification descriptor is recorded for every subdirectory or file registered in the 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 (FIG. 9) is Video
Directory 902 and File-A. DAT file 9
05, the respective file identification descriptors 823 and 824 are recorded. Similarly, directories and files are managed by file identification descriptors and file entries 825 to 830.

Next, a method of managing the AV data 907 will be described. Generally, AV data has a large data size,
Also, the AV data is divided and recorded on a disc in a distributed manner. For example, average data rate 5Mbps
If (Mbit / sec) AV data is recorded for one hour, the size becomes 2 GB (G Byte). On the other hand, generally, when data editing, deletion, or addition of new data is repeated, free areas on the disk are distributed. When new AV data is recorded on a disk in which free areas are distributed, the AV data is recorded in a plurality of extents in a distributed manner.

In FIG. 8, AV data is recorded in a distributed manner in extents 837, 839, 841, and 842. At this time, since the file structure 800 does not manage the content of the data to be recorded, the VOB 881 and the VOB 882
Is not divided at the boundary of
41). Then, the position information of these extents is recorded in the allocation information area 803 using the allocation descriptor. A
Since the number of allocation descriptors to be registered in the V file is larger than that in other files, all the allocation descriptors may not be stored in the file entry 830 having a size limit of one sector or less.

Therefore, the position information of the newly set allocation information area 803 is registered in the position information 862 of the allocation information area in the file entry 830. Assignment information area 8
03 has an allocation extension descriptor 831 at its head, and allocation descriptors 832, 833, 834, and 835 are continuously registered immediately after that. The allocation extension descriptor 831 has a descriptor tag 863 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 832, 833, 834, 835 is:
Each extent 837, 839, 8 of the AV data 907
41 and 842 are designated by the extent length 865 and the start position 866 of the extent.

Next, the program 100 of the control data 906
A method of reproducing the AV data 907 based on 1, 1002 will be described. The programs 1001 and 1002 are:
The reproduction start address 1005 and the reproduction end address 1006 of the VOB are designated by a relative address expression from the head of the AV data 907. Therefore, when searching for the recording position of the AV data to be actually reproduced, the allocation descriptor in the allocation information area 803 is read, and the logical sector number is calculated. The reproduction start position is obtained by sequentially adding the length 865 of the extent 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. Playback of AV data
The reproduction is performed using the allocation descriptor corresponding to the obtained logical sector number. 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.

[0017]

However, in the volume file structure 800 described above, since the data rate information of the recorded area is not managed, A
There is a problem in that when the V data is edited, the reproduction of the AV data is interrupted. Also, if you create a table to manage the data rate for each recorded area,
Since the table information becomes large, there is a problem that it cannot be managed by a consumer device having a limited memory size.

In view of the above problems, the present invention can manage the data rate for each area in which AV data is recorded, and can efficiently edit AV data while guaranteeing continuous reproduction of AV data. 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 device.

[0019]

An information recording medium according to the present invention is an information recording medium in which data is recorded using a data structure including a file structure area and a data area, wherein the data is a The first area includes first AV data having one attribute and second AV data having a second attribute different from the first attribute, wherein the data area has a continuous area, and at least one of the continuous areas includes the first AV data. The first extent in which at least a part of the data is recorded, and the second extent in which at least a part of the second AV data is recorded, thereby achieving the above object.

[0020] The file structure area may include an allocation information area in which first and second allocation descriptors indicating positions of the first and second extents in which the first and second AV data are recorded are recorded. .

In the data area, the first and second AV data to be recorded / reproduced for each sector may be recorded as a file using a file structure.

[0022] In the file structure area, a file entry representing information designating the first and second allocation descriptors may be recorded.

The first allocation descriptor includes information indicating a length of the first extent and information indicating a start position of the first extent, and the second allocation descriptor includes:
Information indicating the length of the second extent;
And information indicating the start position of the extent.

[0024] The first and second AV data may include pack data and packet data for each sector unit.

[0025] The pack header may include time information indicating time related to the transfer of the packet data.

A data recording method according to the present invention is a data recording method for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data is: The data area includes first AV data having a first attribute and second AV data having a second attribute different from the first attribute, wherein the data area has a continuous area, and at least one of the continuous areas is The file structure area includes a first extent in which at least a part of the first AV data is recorded, and a second extent in which at least a part of the second AV data is recorded. And an allocation information area in which first and second allocation descriptors indicating the positions of the first and second extents to be stored are recorded. A first step of recording data in the first and second extents, a second step of creating the first and second allocation descriptors, and a step of storing the first and second allocation descriptors in the allocation information area. A third step of recording, whereby the above object is achieved.

[0027] A data editing method according to the present invention is a data editing method using an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data is AV data. The data area includes first and second extents in which the AV data having continuous time information is recorded, and the AV data includes the time information in the sector unit. And the file structure area includes:
It includes an allocation information area in which first and second allocation descriptors indicating the positions of the first and second extents in which the AV data are recorded are read, and the first sector and the last sector of each extent are read out and read. First time information corresponding to the first sector, and second time information corresponding to the last sector.
A first step of obtaining time information; a second step of reading an edit point sector corresponding to a predetermined edit point and obtaining third time information corresponding to the edit point sector;
The first and second allocation descriptors indicating the positions of the first and second extents, and the first, second, and third descriptors;
A third step of determining whether or not continuous reproduction of the AV data is possible based on the time information, whereby the above object is achieved.

[0028] The file structure area includes an area in which file entries indicating the positions of the first and second extents are recorded. The third step is based on the file entries. And acquiring information representing the position of the information.

The data area includes an area in which control data including information indicating the positions of the first and second extents is recorded. The third step is based on the control data. The method may include a step of obtaining information indicating the position of two extents.

An information recording system apparatus according to the present invention is an information recording system apparatus for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area, Includes first AV data having a first attribute and second AV data having a second attribute different from the first attribute, wherein the data area includes a continuous area, and at least one of the continuous areas
One includes a first extent in which at least a part of the first AV data is recorded, and a second extent in which at least a part of the second AV data is recorded, and the file structure area includes the first and the second. Data for recording first and second AV data in the data area, including an allocation information area in which first and second allocation descriptors indicating positions of the first and second extents in which 2AV data is recorded; Recording means, the first and second A
AV file structure processing means for creating a file entry for managing V data and recording it in the file structure area, and AV allocation structure processing means for creating the first and second allocation descriptors and recording the information in the allocation information area And thereby the above object is achieved.

An information recording system apparatus according to the present invention is an information recording system apparatus for editing data using an information recording medium on which data is recorded using a data structure including a file structure area and a data area. , The data is recorded and reproduced in sector units, and the data is
The data area includes first and second AV data having continuous time information.
The AV data includes an extent, the AV data includes the time information in units of the sector, and the file structure area includes first and second allocation descriptions indicating positions of first and second extents in which the AV data is recorded. AV file structure processing means for including an allocation information area in which a child is recorded, reading the first and second allocation descriptors from the allocation information area, and acquiring position information of the first and second extents, AV allocation structure processing means for reading a first sector and a last sector of the first sector and obtaining first time information corresponding to the first sector and second time information corresponding to the last sector, The AV allocation structure processing means reads an edit point sector corresponding to a predetermined edit point, acquires third time information corresponding to the edit point sector, The V allocation structure processing means, based on the first and second allocation descriptors indicating the positions of the first and second extents and the first, second and third time information, It is determined whether or not reproduction is possible, thereby achieving the above object.

[0032]

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 167 using an information recording medium for recording data in sector units, such as a DVD-RAM disk, is used.
An information recording / reproducing system device for recording / reproducing a file managed using a file structure defined by the standard and a data structure of the information recording medium will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an information recording / reproducing system device 400 according to one 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 controller 401, is subjected to predetermined processing, and is recorded on the disk 700 mounted on the optical disk drive 407. A
At the time of reproducing V data, predetermined data is read from the disc 700 in the optical disc drive 407 under the control of the system control unit 401, and the read AV data is converted into an AV signal by the decoder 409, and the TV 41
1 causes display and sound reproduction.

The system control unit 401 is realized by a microprocessor including a control program and an operation memory.
Control data 906 for controlling reproduction of AV data (FIG. 9,
10), a control data memory 403 for storing the processing information, and a file system processing means 4 for processing the file structure information.
04 and a file system memory 405 for holding the processing information. Note that each of the memories 403 and 405 may use the same memory circuit separately.
The control data 906 has the data structure described in FIG. 10, and 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 a program memory 431 and a VOB information memory 432. The file system processing unit 404 includes a file structure processing unit 441, a file structure processing unit 442, and an AV file structure processing unit 4.
43, AV allocation structure processing means 444, data recording means 4
45, and a data reading unit 446. In order to hold information processed by these units, the file system memory 405 includes a file structure memory 451, A
It comprises a V allocation structure memory 452 and a track buffer 453.

In the directory structure diagram shown in FIG.
Under the root directory 901, File-A. DA
An operation of recording the AV data 907 and its control data 906 on the information recording medium on which only the T file is recorded by using the information recording / reproducing system apparatus 400 will be described.

Based on the flowchart of the recording operation shown in FIG. 2, as shown in FIG. 9, a Video directory 902 and a Vi directory are stored under a root directory 901.
deo. IFO file 903, Video. The data structure 100 after the recording of the AVD file 904 is shown in FIG. FIG. 3 shows a physical space to clearly indicate a physical continuous area for reproducing AV data.

The optical disk 700 is an optical disk drive 4
07, the file system processing means 404 is activated when the user instructs recording of AV data. First, the data reading unit 446 is used to instruct to read the volume structure area 101 from the disk 700 to the optical disk drive 407, and this information is read to the file structure memory 451. The file structure processing means 441 analyzes the volume structure, and sequentially starts from the space bitmap 121 to the file structure area 10.
2 is read into the file structure memory 451. At this time, the file structure processing means 441 stores the non-data area information invisible from the volume space on the inserted disc in the optical disc drive 407 as PDL, SDL
Position information of the defective sectors 711 and 721 registered in the
The position information of the guard area (715) between the zones is queried. The non-data area information obtained from the optical disk drive 407 is read into the program memory 431. (Starting step: S501)

The AV allocation structure processing means 444 searches the space bit map 121 for a free area of a predetermined size, for example, 5 MB or more, so that the AV data 183 is continuously reproduced, and sets it as an AV recordable area. , AV data areas 105, 107, 109, and 110 are registered in the AV allocation structure memory 452. At this time, if the AV recordable area includes a physically managed non-data area even if the logical sector numbers are continuous, the AV recordable area is divided at this boundary. (AV allocation area search step: S
502)

Although not shown, when the user issues an instruction to start recording of AV data to the system control unit 401, the tuner 410 sends the AV data via the encoder 408 to the AV recordable area (AV Data areas 105, 107, 109, and 110). Specifically, the VOB 181 is an extent 137,
139 and 141 are recorded. The VOB 181 has a pack header 170 and packet data 171 for each logical sector because it is composed of a program stream. The pack header 170 contains SCR (System Clo) as time information for transferring the packet data to the decoder 409.
ck Reference) is recorded. On the other hand, during reproduction, each sector is transferred to the decoder 409 within the time indicated by the SCR, so that the AV data is decoded continuously. (VOB data recording step: S50
3)

The VOB information processing means 422 is
08, the parameters relating to the compression of the 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 VOB 18
The information of the first control data is created. (VOB information creation step: S504)

The AV allocation structure processing means 444 generates allocation descriptors 132, 133, and 13 corresponding to the allocation extension descriptor 131 and the extents 137, 139, and 141, respectively.
Create 4. (AV allocation structure creation step: S50
5)

The VOB information processing means 422 stores a new VO
It is determined whether recording of B is necessary (S506),
When the recording of the VOB is completed (YES in S506),
Proceeding to S507, if recording of a new VOB is required (S50)
(NO in 506) executes S505 from S503.
For example, when the tuner 410 outputs a baseball broadcast program following a news program, the VOB1
81, recorded as VOB182. (Step of determining end of recording of VOB data: S506)

The VOB 182 is recorded as an extent 142, and the allocation descriptor 135 of the VOB 182 is created in the same manner as the extents 137, 139, 141. At this time, the extent 141 and the extent 142
Is a physically continuous area, but the SCR is VOB18
Since the logical sector at the end of 1 and the logical sector at the beginning of VOB 182 are not continuous and have an irrelevant value, VOB 1
Extent 14 at the boundary between 81 and 182
1 and the extent 142. (S503 to S505)

The VOB information processing means 422
Then, the file system processing unit 404 is activated. The AV allocation structure processing means 444 records the information of the AV allocation structure memory 452 in the AV allocation structure area 103. (AV assignment structure recording step: S507)

The AV file structure processing means 443 outputs
In order to manage data, the file structure memory 451 is used.
A file entry of the AV file is created above and recorded in the file entry area 130. (AV file structure recording step: S508)

The program processing means 421 stores the recorded A
In the V data, a program in which a user wants to reproduce a part or a reproduction order is created in the program memory 431. (Program information creation step: S509)

The control data processing means 402 records information in the program memory 431 and the VOB information memory 432 as control data 136 in the data area 104. (Control data recording step: S510)

The file structure processing means 442 stores the control data 136 in Video. A file entry is created on the file structure memory 451 so as to be managed as IFO file data, and the file entry 129 is recorded in the file structure area 102. Further, the directory 123 for managing the AV file and its control file is recorded in the file structure area 102 as a subdirectory of the root directory, and the file identification descriptor 123, its file entry 126 and the video directory 12 are recorded.
7, 128 are recorded (main file structure recording step:
S511).

The AV allocation information area 103 may be recorded in the file entry 130 if the file entry becomes one sector or less.

Next, a method of continuously reproducing AV data will be described with reference to FIGS. Data read from the disk 700 of the optical disk drive 407 is temporarily stored in the track buffer 453, and the MPEG signal is expanded into a video signal by the decoder 409 and displayed on the TV 411 as a video. The optical disk drive 407 reads AV data from the continuous area of the disk 700 at a constant data rate Vr,
Accumulate in 53. The AV data stored in the track buffer 453 is transferred to the decoder at the data rate Vo of the AV data. Since the data rate Vo of the AV data is smaller than the data rate Vr of the reading of the optical disk drive 407, in the reading of the continuous area, Vo-V
AV data is accumulated in the track buffer 453 at a rate of r.

When the optical disk drive 407 accesses an area other than the AV data areas 105, 107, 109, and 110, the AV data in the track buffer 453 decreases at a rate of -Vo because data transfer of the AV data is interrupted. I do. FIG. 4 shows a change in the amount of data in the track buffer 453 when the extent of the AV data shown in FIG. 3 is reproduced. Extent 13
7, 139, 141, and 142, the data rates of the respective extents 137, 139, 141, and 14
2 is obtained from the difference between the SCRs recorded in the first and last sectors and the data size of the AV data recorded in each extent. Since the contents of the AV data recorded in the extents 141 and 142 are different, there is no relationship between the SCR recorded in the last sector of the extent 141 and the SCR recorded in the first sector of the extent 142.

The data rate of the AV data of the extent 137 is obtained from the SCR (1) and SCR (2) recorded in the start and end sectors of the extent 137. The data rate of the AV data of the extent 139 is obtained from the SCR (3) and SCR (4) recorded in the start and end sectors of the extent 139. The data rate of the AV data of the extent 141 depends on the SC recorded in the first and last sectors of the extent 141.
It is obtained from R (5) and SCR (6). The data rate of the AV data of the extent 142 is determined by the SCR (7) recorded in the start and end sectors of the extent 142.
And SCR (8).

Extents 137, 139, 141, 1
The data rates of the AV data recorded in 42 are Vo (1), Vo (2), Vo (3), and Vo (4), respectively.
And In the time T1 to T2 for reading the AV data of the extent 137, the track buffer 453 stores Vr-Vo.
AV data is accumulated at the rate of (1). Time T2 to T3 when drive 407 accesses unallocated area 106
In this case, the reading of the AV data of the extent is interrupted, so that the AV data in the track buffer 453 is -Vo.
It is consumed at the rate of (1).

Similarly, during the time T3 to T4 for reading the data of the extent 139, the AV data is accumulated in the buffer 453 at the rate of Vr-Vo (2). Times T4 to T when the drive 407 accesses the data area 108
5, the buffer 453 at the data rate −Vo (2)
Of AV data is consumed. Extents 141, 14
In the times T5 to T6 and T6 to T7 for reading the data of No. 2, the AV data is accumulated in the buffer 453 at the rates of Vr-Vo (3) and Vr-Vo (4), respectively. Thus, as long as the AV data stored in the track buffer 453 does not become zero, it is possible to guarantee that the AV data is continuously reproduced.

Next, specific conditions for determining whether AV data recorded in two areas can be continuously reproduced will be described. The minimum length N_ecc of physically continuous extents from which AV data can be continuously reproduced is:

[0057]

(Equation 1) Can be represented by At this time, the minimum extent length N_ecc is the number of ECC blocks when 16 sectors are 1 ECC block. Vo is the average data rate of the recorded AV data described above in units of Mbps. Tj is the access time from the inner circumference to the outer circumference in seconds. Vr is a fixed data read rate in units of Mbps when the playback device reads a continuous area. In the optical disk drive, there is substantially no difference in the access time for access beyond a predetermined distance. Therefore, it is effective to adapt the access time from the inner circumference to the outer circumference as a common access time. The average data rate Vo is calculated using the actually recorded data,

[0058]

(Equation 2) Is represented by Here, N_pack is the number of logical sectors of the extent. SCR (i) is the value of the SCR recorded in the last logical sector of the extent, and is 27 MHz.
Is a value counted using clock as a clock. SCR (i
-1) is the value of the SCR recorded in the first logical sector of the extent.

Further, when several small access areas (unallocated areas and data areas) where AV data are not recorded are included between extents,

[0060]

(Equation 3) Can be represented by Here, Nt_ecc represents the total length of the extent and the access area (unallocated area, data area) between the extents by the number of ECC blocks. dN_ecc represents the total length of each access area in the number of ECC blocks. Ts is
This is the total time for accessing each access area. This access time is Nt_ecc × 16 × 8 × 2048 /
Vr.

For example, in FIG. 4, when reading out the extent 137 and the extent 139 including the unallocated area 106 where no AV data is recorded during that time, it is determined whether or not the buffer 453 becomes zero.
It can be determined from (Equation 3). At this time, the average data rate V
o is

[0062]

(Equation 4) Can be calculated by Here, N_pack is the total number of sectors of the extents 137 and 139. In general, k
The average data rate Vo for this extent is

[0063]

(Equation 5) Can be calculated by Here, Σ (SCR (i) −SCR
(I-1)) is the sum of the difference between the SCR value of the first sector of the extent and the SCR value of the last sector for each extent.

Next, the operation for editing the AV data shown in FIG. 4 using the information recording / reproducing system apparatus 400 shown in FIG. 1 will be described with reference to the flowchart shown in FIG. I do.

When the user instructs to edit the AV data, first, the file system processing means 40
4 is started, and an instruction is issued to read the volume structure 101 from the disk 700 to the optical disk drive 407 using the data reading means 446, and this information is read to the file structure memory 451. 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
Is the root directory 901 to the Video directory 902 and the Video. IFO file 903, Vid
eo. The AVD file 904 is searched. Next, the file structure processing unit 442 reads the file entries 129 and 130 into the file structure memory 451, analyzes the position information of the control data 136, and reads the control data 136 to the program memory 431. Next, the AV file structure processing means 443 outputs the file structure memory 451.
Then, the AV allocation information area 103 is read, and the position information of each extent is obtained. (FIG. 5: File reading step: S601)

The AV allocation structure processing means 444 stores the pack header 1 of each extent in the optical disk drive 407.
An instruction is issued to read out the SCR recorded in 70, the information is read out to the memory 452 for the AV allocation structure, and the value of each SCR is held. (SCR acquisition step: S60
2)

Next, when the editing point 1 (FIG. 4) is instructed by the user, the AV allocation structure processing means 444 instructs the optical disc drive 407 to read the sector information corresponding to the editing point 1, and this information is read. Is read out to the memory 452 for the AV allocation structure, and the value of the SCR is held as SCR (9). (SCR acquisition step at edit point: S60
3)

Next, the AV allocation structure processing means 444
Nt_ecc is determined according to (Equation 3). At this time, Vo (5) is calculated according to (Equation 5).

[0069]

(Equation 6) Can be calculated as Then, if Nt_ecc satisfies the condition of (Equation 3), the extent 141 after the edit point 1 of the extent 139 is deleted.
Can be continuously reproduced. (Continuous playback determination step: S604) If continuous playback is possible (YES in S604), the AV allocation structure processing means 444 causes the optical disc drive 407 to
In order to change the allocation descriptor 133 of the extent 139, the data of the allocation descriptor 133 is updated and recorded in the AV allocation structure area 103. Next, the file structure processing means 441 updates the space bitmap on the file structure memory 451 so that other data can be recorded in an area behind the edit point 1 of the deleted extent 139, and It instructs the optical disk drive 407 to update the space bitmap 121.
(Editing processing step: S605)

On the other hand, when the editing point 2 shown in FIG. 6 is indicated by the user, the SCR for the editing point 2 is set to SCR (10), and the condition of (Equation 3) is not satisfied. The determination is made in the above step S604 (NO in S604). If the data after the edit point 2 is deleted, the data amount of the AV data in the buffer 453 becomes 0, so that the AV data cannot be continuously reproduced. Therefore, the process ends without performing the editing process for deleting the data. .

As described above, by managing the extent for each continuous SCR, the average data rate of the recorded data can be accurately calculated. At least
An accurate determination can be made only by reading out the sectors before and after the extent.

As described above, for each physically continuous area,
By recording AV data having continuous parameters, the average data rate of the recorded data can be accurately calculated for each area, so that the track buffer at the time of reproduction can be accurately determined.

It should be noted that a plurality of types of AV data may be recorded in the video directory 902 as a plurality of files. For example, AV data may be recorded for each recording date and time, or a still image and a moving image may be recorded in different VOBs.
May be recorded. Also, it may be recorded for each title.

In the above example, each continuous area in which data having the same attribute is recorded is managed as extents 141 and 142.
The attribute information of the file may be recorded in the attribute information 162 of the file entry 130, or may be recorded as a named stream using the extended file entry.

In the above description, an example has been described in which each continuous area is defined as extents 141 and 142 for each piece of data having the same attribute and its position information is managed by the allocation descriptors 134 and 135. Is Video. As part of the control data 136. It may be recorded in an IFO file. For example, each extent 14
1, 142 may be recorded as a table for each extent as part of the control data 136. In this case, the area managed by the allocation descriptors 134 and 135 does not have to be the area where data having the same attribute is recorded, so that the file structure can be simplified. When judging the continuity of AV data at the edit point, the assignment descriptor 1
34, 135 and the length of each extent 141, 142 recorded in the control data 136,
The AV at the edit point is
Data continuity can be easily determined.

[0076]

According to the information recording medium of the present invention, continuous reproduction of recorded AV data can be guaranteed by managing an area in which AV data is recorded as an extent in the AV file structure. For this reason, it is not necessary to read all the sectors in which the AV data is recorded and check the continuity thereof, and it is sufficient to read only the leading and trailing sectors of each extent for each extent, so that the editing of the AV data can be efficiently performed. I can do it. Also, the area where the AV data is recorded is managed as a divided extent in consideration of the continuity of the AV data with the physical area where the user data cannot be recorded in the AV file structure. Continuous playback of data can be guaranteed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an information recording / reproducing system according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a recording operation performed by the information recording / reproducing system apparatus of the present invention.

FIG. 3 is a data structure diagram showing an area configuration according to the first embodiment of the information recording medium of the present invention.

FIG. 4 is a simulation diagram showing a state change of a track buffer when reproducing AV data recorded on an information recording medium of the present invention.

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

FIG. 6 is a simulation diagram showing a state change of a track buffer when reproducing AV data recorded on the information recording medium of the present invention.

FIG. 7 is a physical structure diagram of a conventional information recording medium.

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 AV allocation information area 104 Data area 105, 107, 109, 110 AV data area area 132, 133, 134, 135 Allocation descriptor 137, 139, 141, 142 Extent 170 Pack header 171 Packet data 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 File structure processing means 443 AV file structure processing means 444 AV allocation structure processing means 452 AV allocation structure memory 453 Track buffer

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) H04N 5/91 H04N 5/91 N (72) Inventor Nohisa Fukushima 1006 Ojidoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Tomoyuki Okada 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (20)

[Claims] 1. An information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data is first AV data having a first attribute, and Includes second AV data having different second attributes, wherein the data area has a continuous area, and at least one of the continuous areas has a first extent in which at least a part of the first AV data is recorded. A second AV data in which at least a part of the second AV data is recorded;
An information recording medium including an extent. 2. The file structure area includes an allocation information area in which first and second allocation descriptors indicating positions of the first and second extents in which the first and second AV data are recorded are recorded. The information recording medium according to claim 1. 3. The information recording medium according to claim 1, wherein the first and second AV data recorded and reproduced in sector units are recorded as files using the file structure in the data area. 4. The information recording medium according to claim 2, wherein a file entry representing information specifying said first and second allocation descriptors is recorded in said file structure area. 5. The first allocation descriptor includes information indicating a length of the first extent and information indicating a start position of the first extent, and the second allocation descriptor includes: 3. The information recording medium according to claim 2, comprising information indicating a length of an extent and information indicating a start position of the second extent. 6. The information recording medium according to claim 3, wherein the first and second AV data have a pack header and packet data for each sector unit. 7. The difference between the first time information and the second time information recorded in the first sector and the last sector of the extent and the data size of the AV data recorded in the previous extent, respectively. 7. The information recording medium according to claim 6, wherein the information recording medium indicates an average data rate required to transfer the previous AV data recorded in the extent. 8. The information recording medium according to claim 6, wherein said pack header includes time information indicating a time relating to transfer of said packet data. 9. A data recording method for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data has a first AV having a first attribute. Data, and second AV data having a second attribute different from the first attribute, wherein the data area has a continuous area, and at least one of the continuous areas is at least a part of the first AV data. And a second extent in which at least a part of the second AV data is recorded. The file structure area includes the first and second AV data in which the first and second AV data are recorded. And an allocation information area in which first and second allocation descriptors indicating positions of two extents are recorded, wherein the first and second AV data are stored in the first and second AV data. A first step of recording each in an extent; a second step of creating the first and second allocation descriptors; and a third step of recording the first and second allocation descriptors in the allocation information area. Data recording method to be used. 10. A data editing method using an information recording medium on which data is recorded, wherein the data includes AV data, recording and reproduction are performed in sector units, and the data area includes continuous time information. The first and second continuous areas in which the AV data is recorded, wherein the AV data has the time information in units of the sector, and reads the first sector and the last sector of each continuous area to read the AV data. Obtaining first time information corresponding to the first sector and second time information corresponding to the last sector; reading an edit point sector corresponding to a predetermined edit point; Second time to get third time information
And a third step of determining whether continuous reproduction of the AV data is possible based on the sizes of the first and second continuous areas and the first, second, and third time information. Include data editing methods. 11. The data editing method is a method using a data structure including a file structure area and a data area, wherein the file structure area includes a first and a second continuous area in which the AV data is recorded. First and second extents representing the position of the extent as first and second extents
An allocation information area in which an allocation descriptor is recorded, wherein the third step includes the first and second allocation descriptors representing position information of the first and second extents,
11. The data editing method according to claim 10, wherein it is determined whether continuous reproduction of the AV data is possible based on the first, second, and third time information. 12. The data area includes an area in which information indicating positions of the first and second continuous areas is recorded as a part of control data, and the third step is based on the control data. 11. The data editing method according to claim 10, further comprising the step of acquiring information indicating the positions of said first and second continuous areas. 13. The file structure area includes an area in which file entries indicating the positions of the first and second extents are recorded, and the third step includes the steps of: The data editing method according to claim 10, further comprising a step of acquiring information indicating a position of two extents. 14. The data area includes an area in which control data including information indicating the positions of the first and second extents is recorded, and the third step includes determining the first and second extents based on the control data. The data editing method according to claim 10, further comprising a step of acquiring information indicating a position of the second extent. 15. An information recording system apparatus for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data has a first attribute. 1 AV data and second AV data having a second attribute different from the first attribute, wherein the data area includes a continuous area, and at least one of the continuous areas is at least a part of the first AV data. And a second extent in which at least a part of the second AV data is recorded. The file structure area includes the first and second AV data in which the first and second AV data are recorded. 2 includes an allocation information area in which first and second allocation descriptors indicating positions of two extents are recorded, and stores the first and second AV data in the data. Data recording means for recording in the area; file entry for managing the first and second AV data; and AV file structure processing means for recording in the file structure area; and first and second allocation descriptors. And an AV allocation structure processing means for recording in the allocation information area. 16. An information recording system apparatus for editing data using an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data is provided in sector units. The recording / reproduction is performed, the data includes AV data, and the data area includes continuous time information.
The AV data includes first and second extents in which data is recorded, the AV data has the time information in units of the sector, and the file structure area includes first and second extents in which the AV data is recorded. An allocation information area in which first and second allocation descriptors indicating positions are recorded, wherein the first and second allocation descriptors are read from the allocation information area, and position information of the first and second extents is obtained. Reading the first sector and the last sector of each extent, first time information corresponding to the first sector,
AV allocation structure processing means for obtaining second time information corresponding to the last sector, wherein the AV allocation structure processing means reads an edit point sector corresponding to a predetermined edit point, and reads the edit point sector. The AV allocation structure processing means acquires the first and second allocation descriptors representing the positions of the first and second extents and the first, second, and third descriptors. Based on the time information
An information recording system device for determining whether continuous reproduction of the AV data is possible. 17. An information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data area has a physically continuous area,
An information recording medium including the physically continuous area on which data is recorded. 18. The information recording apparatus according to claim 17, wherein a continuous area where the AV data is recorded is defined as an extent, and the file structure area includes an allocation information area in which an allocation descriptor indicating a position of the extent is recorded. Medium. 19. A data recording method for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area, wherein the data area is physically continuous. Recording an AV data in the physically continuous area having an area, and creating an allocation descriptor indicating a position of the extent using the continuous area in which the AV data is recorded as an extent; Recording the allocation descriptor in an allocation information area. 20. An information recording system apparatus for recording data on an information recording medium on which data is recorded using a data structure including a file structure area and a data area,
The data area has a physically continuous area, means for recording AV data in the physically continuous area, and a position of the extent, where the continuous area where the AV data is recorded is an extent. An information recording system device, comprising: means for creating an allocation descriptor to be represented; and means for recording the allocation descriptor in an allocation information area.