JPH08241230A - Data management method and data recorder - Google Patents

Abstract

PURPOSE: To provide a data management method which stores data of a large data volume like AV data and data of a small size like text data on the same recording medium in relation to each other. CONSTITUTION: The recording medium is divided into an area for storage of continuous data like AV data and an area for storage of discontinuous data like text data, and data management in the former area is performed in the record entry system, and that in the latter is performed in the i-node system. With respect to file entry, two pointers of the record entry number of continuous data and the i-node number of discontinuous data are described for one file name. Thus, two data of continuous data and discontinuous data are managed by one file name.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to continuous data, such as video data and audio data, which requires continuous access, and text data when recording data on a recording medium such as a hard disk or a magneto-optical disk. The present invention relates to a data management method and a data recording device capable of recording non-continuous data in association with each other on the same recording medium.

[0002]

2. Description of the Related Art As a file management function when recording data on a disk medium such as a hard disk or a magneto-optical disk (hereinafter referred to as MO disk), there is area management such as how a file is recorded on the disk. . And in the area management, the relationship between the unit of data read and written at one time and the size of the data handled,
Also, how to allocate areas to files becomes an important issue.

MS-DOS (trademark of MicroSoft, USA) which is a general OS for personal computers
Now, for file data management, FAT (File Allocatio
n Table) method is used. The FAT method will be described with reference to FIG. 10A and 10B are diagrams for explaining file management in the FAT system, where FIG. 10A is a diagram showing the structure of a file entry, FIG. 10B is a diagram showing the structure of the FAT, and FIG. FIG. In MS-DOS, clusters are assigned as a unit when assigning an area to a file. That is, one file is divided and recorded for each cluster, and an entry is provided for each cluster. The FAT manages the connection between the clusters to form one file while showing the usage status of the clusters.

Each entry of the FAT corresponding to a cluster is (1) unused, (2) used and data is connected to another cluster, and (3) used and is the last cluster of the data. One of (4) a defective cluster. In the case of “(2)“ Used and data is connected to another cluster ””,
The next cluster number is recorded as the FAT entry. In addition, in the case of (3) “used and the last cluster of the data”, E is entered as the FAT entry.
OF (usually -1) is recorded. Therefore, by searching the file entry based on the file name, reading the number of the start cluster of the file, and tracing the FAT from the start cluster to the last cluster where EOF is written, the cluster in which the file data is recorded can be found. You can get all.

In FIG. 10, for example, "file1".
When accessing the file with the file name "1", the file entry is searched first to find the file entry "file1". When the file entry of "file1" is found, the start FAT number of the file entry is read. In the example shown in FIG. 10, it is 3. Next, the contents of the No. 3 FAT are read to obtain the next FAT number 4. Similarly, the FAT number 8 is obtained from the contents of the 4th FAT. And since the content of the 8th FAT is EOF, "f
The file "ile1" ends at this cluster.
Finally, as the contents of “file1”, the cluster 3,
Data 4 and 8 are accessed.

UNIX (US UNIX System Lab), which is rapidly spreading mainly in workstations,
In the case of a trademark of the Oratories Company, i-node is used for managing file data. This i-nod
The e method will be described with reference to FIG. FIG.
It is a figure explaining the file management in an i-node system, (A) The figure which shows the constitution of the file entry,
(B) is a figure which shows the structure of i-node, (C) is a figure explaining the data recording part of a disc. Also in UNIX, one file is divided into blocks and recorded on the disk, and the block number in which the file is recorded is recorded in the i-node. In addition,
As the block number, in addition to the direct designation pointer directly indicating the block in which the file data is written, an indirect designation pointer indicating a block in which a plurality of direct designation pointers are written may be described. For i-node,
Information such as attribute information and size of other files is described.

In FIG. 11, for example, "file2".
When accessing a file with the file name "1", the file entry is searched first to find the file entry "file2". When the file entry of "file2" is found, the i-node number of the file entry is read. In the example shown in FIG. 11, it is 20. Then, the contents of the 20th i-node are read to obtain the file size and the block number in which the data is recorded. In the example of FIG. 11, the file size is 3000 bytes, and the data is recorded in blocks 3, 4, and 8. The block size here is 1024 bytes (= 1 Kbyte). Therefore, up to the 952th byte of block 8 is valid data.

[0008]

By the way, when recording AV data, it is sometimes desired to record a description of the recording status and contents of the AV data or still image data for data identification in association with each other. . However, in the file management method described above, one file name is associated with one piece of data. That is, the AV data and the related data cannot be associated at the file management level. If the correspondence is to be made, there is no choice but to manage the correspondence of those data at the application level. However, in such a method, the handling of the data file is troublesome because the correspondence must always be taken into consideration.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a data management method capable of easily associating continuous data such as audio data and video data that needs continuous access with discontinuous data such as text data. To provide. Another object of the present invention is a data recording device capable of recording continuous data, such as audio data and video data, which needs continuous access, and discontinuous data, such as text data, in association with each other. To provide.

[0010]

In order to solve the above problems, file management is performed by using a file entry that allows a plurality of data to be associated with one file name. That is, the file entry is A
It is configured to include a pointer that specifies both continuous data such as V data and discontinuous data such as text data.

Therefore, the data management method of the present invention is
The data recording area of the recording medium is divided into a first area in which continuous data that needs continuous access is divided into one or more variable-length records, and a non-continuous data that does not require continuous access. The recording medium is divided into the above-mentioned fixed-length blocks and a second area for recording, and data access to the recording medium is performed by a pointer to the recording data in the first recording area for one file name. Management is performed by a file entry having both pointers to the recording data in the second recording area, and either one or both of the continuity data and the discontinuity data is accessed based on one file name.

Further, the data recording apparatus of the present invention divides the AV data into one or more variable-length records and records them.
And a data recording medium having a second area for recording data other than AV data related to the AV data by dividing the data into one or more fixed-length blocks, and accessing the data to the recording medium. Data management means for managing with one file name is provided by a file entry having both a pointer for recording data in the first recording area and a pointer for recording data in the second recording area. Data other than the AV data and the related AV data can be simultaneously accessed based on one file name.

In the data management method and data recording apparatus of the present invention, pointers to both continuous data files and non-continuous data files are prepared for one file entry. As a result, association between continuous data and discontinuous data can be realized at the file system level, and when viewed from the application level, it can be handled as one file without worrying about the association between these data.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of a data management system according to the present invention, first, a data management system related to the applicant of the present application will be described. First, a record entry method, which is a file management method related to the applicant of the present application, will be described with reference to FIG. 1A and 1B are diagrams for explaining file management in the record entry method. FIG. 1A is a diagram showing the structure of a file entry, FIG. 1B is a diagram showing the structure of a record entry, and FIG. 1C is a data recording portion of a disc. It is a figure explaining. In the record entry method, a file is divided into a plurality of continuous variable length areas and recorded on a disc. One continuous area is managed by a management unit called a record entry, and a plurality of record entries are linked to form file data.

In FIG. 1, when accessing a file having a file name "file3", for example, the file entry is first searched to find the file entry "file3", and the record entry number of the file entry is read. In the example shown in FIG. 1, it is 1. next,
The contents of the record entry 1 are read out, and the linked record entry number, the start block number of the record, and the record size are read out. From the starting block number and record size of this record, "file
The data of "3" becomes accessible. Similarly, by following the linked record entries, "fi
data of "le3" are sequentially accessed. When the linked record entry number becomes EOF, the data of "file3" ends at that record entry.

In the case of FIG. 1, the data consists of three consecutive areas of blocks 1200 to 100 blocks long, 1400 to 600 blocks long and 2200 to 300 blocks long. In such a record entry method,
One record entry is used for each continuous area on the medium. Therefore, it is possible to reduce the management area for relatively large size data such as audio data and video data, as compared with the FAT system and i-node system described above.

Another method of data management related to the applicant of the present application is a method in which the above management methods are combined.
The method divides a recording medium into two areas, and manages data in the first area by the record entry method and manages data in the second area by the i-node method. is there. In this management method, the file type is recorded in the file entry, and the first or second area is accessed based on the file type.

In this management method, data that has a large amount of data such as AV data and requires continuous access is
One recording area is recorded in the first area managed by the record entry method which is relatively large, and data having a small amount of data such as text data is managed by the i-node method in which the size of each management information is small. Second
Can be recorded in the area. As a result, regarding the recording of the AV data, the number of divisions is reduced, so that the management information can be suppressed, and further, the data can be continuously and accessiblely recorded in a continuous area.

Next, the data management method of the present invention, and
An embodiment of a data recording device to which the data management method is applied will be described with reference to FIGS. Figure 2
FIG. 3 is a block diagram showing a configuration of an AV server device to which the file management method of the present invention is applied. This AV server device is mainly composed of a large-capacity data recording device, records various AV data composed of video signals and audio signals, and outputs the data appropriately for requesting editing or broadcasting. It is a supply device.

First, referring to FIG. 2, the AV server device 1
The overall configuration and operation will be described. A digitized video signal is input to the AV server device 1. Digital video signal S10 which is the input is inputted to the video signal high-efficiency coding apparatus 10 ₁ to 10 _n, the high-efficiency encoded video data S11a is generated coded with high efficiency. It should be noted that the video signal high-efficiency encoders 10 ₁ to 10
The coding rate at _n is the synchronization system control execution unit 16
Is set by the control signal S12. Further, the high-efficiency encoders 10 ₁ to 10 _n normally operate by a synchronization signal based on the synchronization signal S18 input to the synchronization system control execution device, but extract the clock and frame timing from the input video signal S10. Can also be used internally, and when operated in this manner, a video signal synchronized with the video signal synchronization signal can be input. The generated high-efficiency coded video data S11a is input to the circuit switching device 11 such as a routing switcher for a broadcasting station.

The circuit switching device 11 converts the input high-efficiency coded video data S11a into the input high-efficiency coded video data based on the control signal S13 indicating the circuit switching destination input by the synchronous system control execution device 16. As S11b, the data is input to any of the _n data storage devices 30 ₁ to 30 _n . The data storage devices 30 ₁ to 30 _n are individually controlled by the control signal S14 from the synchronous system control execution device 16, and are stored in the data storage devices 30 ₁ to 30 to be described later.
The data management device 308 in _n stores and manages the input high-efficiency coded video data S11b, and reproduces the input high-efficiency coded video data S11b according to a desired reproduction request. The reproduced video data is output to the circuit switching device 11 as reproduction high-efficiency coded video data S15a.

The reproduced high-efficiency coded video data S15a input to the circuit switching device 11 is high based on the control signal S13 indicating the circuit switching destination input from the synchronous system control execution device 16 as at the time of input. As the efficiency-coded video data S15b, n video signal decoding devices 13 _{1 to} 13
Input to any of _n . Video signal decoding apparatus 13 ₁ -
13 _n is the input high-efficiency coded video data S15b
Is decoded to generate a restored video signal S16, which is output from the AV server device 1 to, for example, an editing device. It should be noted that the decoding is performed by using the encoded data (high-efficiency encoded video data S15
Since it can be automatically decoded according to b), no particular control signal is input to the video signal decoding devices 13 _{1 to} 13 _n .

Further, in the AV server device 1, the LA
The control command S17a is sequentially transmitted to the control command transmission device 15 from the host application system 14 such as a computer device connected via N. The control command transmitting device 15 converts the control command S17a from a LAN communication protocol into a protocol capable of communicating with the synchronous system control executing device 16, and transfers the converted control command S17b to the synchronous system control executing device 16. . According to this control signal,
The above-mentioned units perform desired operations.

Next, the data storage devices 30 ₁ to 30 _{n according} to the present invention of the AV server device 1 will be described in more detail with reference to FIGS. 3 and 4. FIG. 3 is a block diagram showing a configuration of the data storage devices 30 ₁ to 30 _n , and FIG. 4 is a diagram showing a configuration of the data management device 308 realized in software format on the memory circuit (MEM). is there. As shown in FIG. 3, the data storage device 30 _i
(I = 1 to n) has a format conversion device (CNV) 31 and a disk device 32, and the disk device 32 includes a write / read circuit (W / R device) 302 and a control circuit 304.
And a memory circuit 306.

The high-efficiency coded video data S11b transmitted by the data transmission medium capable of transmitting the baseband digital video signal is input to the format conversion device 31 and converted into a format that can be input to the disk device 32. To be done. On the other hand, the data reproduced from the disk device 32 is
It is input to the format conversion device 31 and converted into reproduction high-efficiency coded video data S15a transmitted by a data transmission medium capable of transmitting a baseband digital video signal, which is equivalent to that at the time of recording.

The W / R device 302 of the disk device 32 is
Controlled by the control circuit 304, the MO disk 40 is rotated, and the recording data input from the format conversion device 31 is written to the MO disk 40. Also, the MO disc 40
The recording data is read from and output to the format conversion device 31. The control circuit 304 uses the synchronous system control execution device 16
Based on a control signal S14 from the memory circuit 306, each program of the data management device 308 is executed and the W / R device 302 is controlled to record or reproduce the recording data on the MO disk 40. To perform.

In the present embodiment, the data storage device 30 _i writes / reads (accesses) recording data to / from the MO disk device 40 in units of 1 Kbyte blocks. The format conversion device 31 and the disk device 32 are connected via a general-purpose connection line S120 in which data and control signals are mixed. Further, the data storage device 30 _i can arbitrarily change the recording / reproducing speed within the range of the maximum data transfer speed of the disk device 32.

Further, the above-mentioned data management device 308 is
As shown in FIG. 4, the control circuit 30 is included in the memory circuit 306.
4, which is realized in the form of software executed by the record entry generation program (REG) 31.
0, link data generation program (LDG) 312, head position data generation program (HDG) 314, recording length data generation program (RLDG) 316, file entry generation program (FEG) 318, access management program (AM) 320, free area Ensuring program (EAG) 322, recording data writing program (DW)
324, free recording area management program (EAM) 32
8, a data management program (DM) 330, a recording data read program (DR) 332, and an operating system (OS) 334 that controls the execution of these programs.

As described above, in the AV server device 1, various material AV data obtained through interviews and the like are high-efficiency coded by the video signal high-efficiency coding device 10 and desired via the circuit switching device 11. The data is stored in the data storage device 30 of FIG. Then, when a predetermined AV data supply request signal is input from the application system 14 such as an editing device to the control command transmission device 15 via the LAN, each unit is controlled by the synchronous system control execution device 16 to generate the AV data. Output is done. That is, the requested AV data recorded in the data storage device 30 is reproduced,
It is input to the video signal decoding device 13 via the circuit switching device 11. Then, it is decoded by the video signal decoding device 13 and output to the editing device.

In such an AV server device 1,
Along with the AV data, shooting information and comments related to each AV data, or text information such as a telop at the time of program transmission is simultaneously recorded and used together with the AV data. In this case, it is necessary to simultaneously record AV data, which has a large data amount and is mainly accessed continuously, and text data, which has a small data amount and does not need continuous access, on the same recording medium of the data storage device 30 at the same time. Occurs. The data management method of the present invention is applied to a data management method in such a case.

Next, the data management method of the present invention applied to the data storage device 30 of the AV server device 1 will be described. The data storage device 30 includes a plurality of MOs.
Although it is composed of a disk device, a data management method for one of the MO media will be described below.

First, the structure of the MO disk of this embodiment will be described with reference to FIGS. FIG. 5 is a diagram showing the overall structure of the MO disk. FIG. 6 is a diagram showing the structure of the file entry FE. FIG. 7 is a diagram showing the structure of the entries in the continuous data area CA and the non-continuous data area RA, where (A) is the continuous data area C.
FIG. 3 is a diagram showing the configuration of a record entry of A, and FIG. 3B is a diagram showing the configuration of an i-node of the non-contiguous data area RA.

The MO disc of the present embodiment uses a recording medium as a system area SA, a file entry FE,
Continuous data area CA (Continuous Area), and
It is used by being divided into four areas of a non-contiguous data area RA (Random Area). The data is actually recorded
Continuous data area CA (Co
ntinuous Area) and a non-continuous data area RA (Random Area) which is a recording area for non-continuous data.

The system area SA is an area where the parameters of the entire disc are described, and the media identifier, user information and file system parameters are recorded. The user information is an area open to the user. As the file system parameter, the file entry F
The start block of each area of E, the continuous data area CA, and the discontinuous data area RA is recorded.

The structure of the file entry FE is shown in FIG. As shown in FIG. 6, the file entry FE contains 1
A record entry number, which is a pointer to data in the continuous data area CA, and an i-node number, which is a pointer to data in the non-continuous data area RA, are recorded for each file name. Furthermore, the file entry FE corresponds to each data area,
Information about the data size, the creation date, and the creation time for each two items is described. Therefore, this file entry FE
According to the configuration of the
The data corresponding to one file is associated.

The continuous data area CA is an area in which continuous data such as AV data is recorded, and the recorded data is managed by a record entry method. This record entry method is the same as the method described above with reference to FIG. 1, and the data is managed by the record entry as shown in FIG. 7 (A). The continuous data area CA is composed of a super block representing the internal structure of the continuous data area CA, a record entry, free area information, and a continuous data recording area.

The non-continuous data area RA is an area in which non-continuous data such as text data is recorded, and the recorded data is managed by the i-node system. This i-
The node method is the same as the method described above with reference to FIG. 11, and data is managed by the i-node as shown in FIG. 7B. The non-contiguous data area RA is a super block showing an internal structure of the non-contiguous data area RA, an i-node bitmap showing a free area of an i-node, a block bitmap showing a free area, and an i-node.
It is composed of a node recording area and a non-continuous data recording area.

Next, a procedure for accessing data in the MO drive to the MO disk medium having such a configuration will be described. First, this MO disc is MO
When inserted in the drive, first the system area SA
Is read, and it is determined where on the disc the file entry FA, the continuous data area CA, and the non-continuous data area RA are located. Continuous data area C
For A and the non-contiguous data area RA, the super block is further read and the management information in each recording area is read.

The access to each data file by the MO drive is switched by a command or a command option according to each data type. In the MO drive of the present embodiment, switching is performed with the four commands shown in Table 1.

[0040]

[Table 1] (1) Read continuous data PLAY (2) Write continuous data RECORD (3) Read non-continuous data READ (4) Write non-continuous data WRITE

Then, for example, when the PLAY is executed, the data file is accessed as follows, as shown in the flow chart of FIG. First, a file entry is acquired from the file name (step s2
1). The first record entry number is acquired from the file entry and set to the acquired record number (step s22). If the acquired record number is EOF (step s23), an error is output and the process ends (step s29). If the acquired record number is not EOF in step s23, the record entry of the acquired record number is loaded (step s24), and the record entry is added to the access record list (step s25).

By referring to the LINK of the record entry, L
If INK ≠ EOF, the LINK record number is set as the acquisition record number, and the processing from step s23 is repeated (step s26). If LINK = EOF in step s26, the file data is accessed according to the access record list (step s
27) When the access is completed, the process is completed (step s28).

Access to the data file when READ is executed is performed as follows, as shown in the flowchart of FIG. First, a file entry is acquired from the file name (step s31). The i-node number is acquired from the file entry (step s32). If the acquired i-node number is 0 (step s33), an error is output and the process ends (step s37). If the i-node number acquired in step s33 is not 0, the i-node
The i-node of the number is loaded (step s34), and the file data is accessed according to the block pointer described in the i-node (step s35).
When the access ends, the processing ends (step s3)
6).

As described above, according to the data management method of the present invention, recording data is divided into continuous data and non-continuous data,
The data is recorded in a predetermined area by a predetermined management method, and both the continuous data and the non-continuous data can be accessed from one file name. As a result, AV data that has a relatively large amount of output AV data and that requires continuous access and text data that has a relatively small amount of data that does not require continuous access are recorded on the same recording medium by appropriate management methods. And now they can be accessed by two file names.
Specifically, for example, in the data storage device 30 of the AV server device 1 as shown in FIG.
Shooting records and comments related to data, or text information such as telops at the time of program transmission are associated with each other,
It is now possible to record efficiently at the same time.

The data management method of the present invention is not limited to this embodiment, and various modifications can be made. For example, the file management method for the non-continuous data area RA is the i-node method, but this may be the FAT method. Further, although the MO disk medium has been described in the present embodiment, a hard disk may be used.

[0046]

According to the data management method of the present invention, since pointers to both continuous data files and non-continuous data files are prepared for one file entry, continuous access to audio data, video data, etc. It was possible to provide a file management method capable of easily associating continuity data that requires data with discontinuity data such as text data.

According to the data recording apparatus of the present invention,
Since it is possible to record the AV data in association with the AV data and a description of the recording status and contents related to the AV data, or still image data for data identification, the AV data can be applied to an AV server device or the like for editing. It was possible to provide a suitable data recording device.

[Brief description of drawings]

1A and 1B are diagrams illustrating file management in a record entry method, where FIG. 1A is a diagram showing a configuration of a file entry, and FIG. 1B is a diagram showing a configuration of a record entry;
(C) is a diagram for explaining the data recording portion of the disc.

FIG. 2 is a block diagram showing a configuration of an AV server device to which an embodiment of a data management method of the present invention is applied.

3 is a block diagram showing a configuration of a data storage device of the AV server device shown in FIG.

4 is a diagram showing a configuration of a data management device implemented in a software format in a memory circuit of the data storage device shown in FIG.

5 is a diagram showing an overall configuration of an MO disc used in the data storage device of the AV server device shown in FIG.

6 is a diagram showing the structure of a file entry FE of the MO disc shown in FIG.

7 is a diagram showing the structure of entries in a continuous data area CA and a non-continuous data area RA of the MO disk shown in FIG. 5, (A) being a diagram showing the structure of record entries in the continuous data area CA; B) is a diagram showing a configuration of an i-node of the non-continuous data area RA.

FIG. 8 is a flowchart showing a procedure for accessing a data file when PLAY is executed.

FIG. 9 is a flowchart showing a procedure for accessing a data file when READ is executed.

FIG. 10 is a diagram illustrating file management in the FAT system, in which (A) is a diagram showing a configuration of a file entry;
(B) is a diagram showing the configuration of the FAT, and (C) is a diagram for explaining the data recording portion of the disc.

11A and 11B are diagrams illustrating file management in the i-node system, in which FIG. 11A is a diagram showing the structure of a file entry, FIG. 11B is a diagram showing the structure of an i-node, and FIG. It is a figure explaining a recording part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... AV server device 10 ... Video signal high efficiency encoding device 11 ... Circuit switching device 13 ... Video signal decoding device 14 ... Application system 15 ... Control command transmission device 16 ... Synchronous system control execution device 30 ... Data storage device 31 ... Format Conversion device 32 ... Disk device 302 ... W / R device 304 ... Control circuit 306 ... Memory circuit 308 ... Data management device 310 ... Record entry generation program (REG) 312 ... Link data generation program (LDG) 314 ... Head position data generation program (HDG) 316 ... Recording length data generation program (RLDG) 318 ... File entry generation program (FEG) 320 ... Access management program (AM) 322 ... Free space securing program (EAG) 324 ... Recording data writing program (DW) 328 … Free space Recording area management program (EAM) 330 ... Data management program (DM) 332 ... Recording data read program (DR) 334 ... Operating system (OS) 40 ... MO disc

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 27/00 D 27/10 A

Claims (2)

[Claims] 1. A first area for recording continuity data, which requires continuous access, in a data recording area of a recording medium by dividing it into one or more variable-length records, and a non-continuous area that does not require continuous access. Property data is divided into one or more fixed-length blocks and a second area for recording, and data access to the recording medium is recorded in the first recording area for one file name. Management is performed by a file entry having both a pointer for data and a pointer for recording data in the second recording area, and based on one file name, either or both of the continuity data and the discontinuity data. Data management method to access the. 2. A first area in which AV data is divided into one or more variable-length records and recorded, and data other than AV data related to the AV data is divided into one or more fixed-length blocks and recorded. A data recording medium having a second area, data access to the recording medium, a pointer to the recording data of the first recording area for one file name, and recording of the second recording area A data recording device that manages by a file entry having both pointers to data and is capable of simultaneously accessing data other than the AV data and the related AV data based on one file name. .