JP2001243107A - Av data recorder and its method, disk recored by av data recorder and the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an audio-visual data recorder and a method, which can minimize a seek time even if a UDF file system is used. SOLUTION: The audio-visual data recording method provides file management information and manages files that consists of grouped extents of continuous blocks on a disk. The data recording method generates a new directory and new file and concurrently reserves a reserved area in the file management information in order to record the new directory and file management data for the new files. In addition to the new directory and the file management data, in the reserved area the method also records a usage status of the file management information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an AV data recording apparatus and method suitable for recording and reproducing AV data such as digital images.

[0002]

2. Description of the Related Art In recent years, the use of optical disks as recording media for digital images including moving images has been increasing due to the increase in the density of optical disks. Its application range is wide and extends not only as a peripheral device of a computer but also to a video player for home use, and is expected to be used as a recording medium for recording in place of a tape medium in the future.

[0003] In such a wide range of application fields, in order to handle data in common, it is common to manage data in logical units called files. One of such file management methods is UDF (Universal Di
sk Format) file system.

[0004] The UDF standard defines various computer operating systems.
(Operating Systems) are defined so as to ensure medium compatibility, and are also adopted in DVD video players that are consumer devices. In the future, support on a wider range of platforms is expected.

A configuration of a file system using the UDF standard (hereinafter, referred to as "UDF file system") will be described below with reference to the drawings. FIG. 11 shows a configuration example of an AV data recording apparatus to which a conventional AV data recording method is applied.

In FIG. 11, reference numeral 101 denotes a disk such as a magneto-optical disk, and 102 denotes a recording medium driving unit. For example, when the disk 101 is a magneto-optical disk, the recording medium driving unit 102 is constituted by a spindle motor or the like. You.

Reference numeral 103 denotes a recording / reproducing unit. For example, when the disk 101 is a magneto-optical disk, it comprises an optical pickup, a magnetic head, a servo circuit, a modulation / demodulation circuit and the like. Reference numeral 104 denotes a memory unit for recording data,
During reproduction, data is temporarily stored. A disk drive unit 105 includes a disk 101, a recording medium driving unit 102, a recording / reproducing unit 103, and a memory unit 1.
04.

Reference numeral 106 denotes an AV signal processing unit.
MP for an AV input signal input from a CD camera, etc.
A process such as EG compression is performed, or a process such as MPEG decoding is performed on the AV data read from the disk 101 and output to a monitor or the like.

Reference numeral 107 denotes a system control unit.
AV signal processing unit 106 and disk drive unit 1
05 is performed.

In the data recording / reproducing apparatus configured as described above, when recording data, the AV signal processing unit 106
The AV signal input to is transmitted to the memory unit 104 under the control of the system control unit 107 after image compression processing such as the MPEG method is performed.

Next, the recording medium driving unit 102 and the recording / reproducing unit 103 are operated by the system control unit 107, and the data on the memory unit 104 is recorded on the disk 101.

At the time of reproducing data, the recording medium driving unit 102 and the recording / reproducing unit 103 are operated by the system control unit 107, and the data recorded on the disk 101 is transferred to the memory unit 104.

Next, under the control of the system control unit 107, data is read from the memory unit 104 and output from the AV signal processing unit 106 as an AV signal.

Next, a configuration example of a UDF file system which is a conventional file management method will be described with reference to the drawings. FIG. 12 is a structural diagram of a UDF configured in the disk 101 in a volume space.

In FIG. 12, in order to treat the disk 101 as a logical volume, the disk 101 is divided into units called sectors, and the sectors
Logical sector numbers (LSN) from (zero) to the last logical sector (Last LSN) are allocated. Also,
A volume structure is recorded at the beginning and end of the volume space. Further, between these volume structures, a partition space for recording file structure information and user data files is allocated.

In the partition space, logical block numbers (LBN) are allocated in units of sectors from the first sector in a range from 0 (zero) to the last logical block number (Last LBN). FIG. 13 is a structural diagram in the partition space when the directory structure shown in FIG.

In FIG. 14, a directory DIR1 exists under the ROOT directory, and a directory DIR1 exists.
FILE1_1 and FILE1_2 are present under the line. At this time, in FIG. 13, the space bitmap descriptor is recorded in LBN = 0 to 79.

The space bitmap descriptor has a space bitmap indicating whether each logical block can be allocated. Each bit of the space bitmap corresponds to each logical block. When this bit value is “1”, the logical block is in an unallocated state, and when this bit value is “0” (zero), it is in an allocated state. Means

In LBN = 80, a file set descriptor (File Set Descriptor) is recorded. The file set descriptor records the position information of the file entry of the root directory. The file entry will be described later in detail.

In LBN = 81, a termination descriptor is recorded. The end descriptor indicates the end of the file set descriptor sequence.

In LBN = 82, a file entry of the root directory is recorded. File entry (File
Entry) is used to store various attribute information unique to each file, information on the recording position of the file, information on the size of the file, and the like, and manage the file as a group of extents. The extent will be described later in detail.

FIG. 15 shows a configuration example of a file entry. In the descriptor tag field, information for determining various descriptors such as a space bitmap descriptor, a file set descriptor, and a file entry in the partition space is recorded. For file entries,
261 is described. I
In a CB (Information Control Block) tag field, attribute information on the file entry itself is recorded. The extended attribute field is used to describe attribute information other than the contents specified in the attribute information field in the file entry. In the allocation descriptor field, a required number of allocation descriptors for managing a continuous logical block area as one extent are recorded.

FIG. 16 shows the structure of the allocation descriptor. The extent in the allocation descriptor is
It is indicated by the extent length and extent position.

FIG. 17 shows the interpretation of the upper two bits of the extent length included in the allocation descriptor. Top 2
The allocation status and recording status of the extent are represented by the bit values. If the value is '0' (zero), it is an allocated and recorded extent, and file data is recorded. When the value is “1”, it is an allocated and unrecorded extent, and the area is allocated to a specific file / directory, but no data is recorded. If the value is “2”, it is an unallocated and unrecorded extent, and no data is recorded. If the value is '3', it is the extent following the allocation descriptor. A plurality of allocation descriptors can be recorded in the allocation descriptor field in the file entry, and one file is constituted by a set of extents managed by the allocation descriptors.

In the directory, the file name of the file included in the directory and the position information of the file entry are recorded. In UDF, a directory is also a type of file, and in FIG. 13, LBN = 83 or L
BN = 85.

FIG. 18 shows an example of the structure of a directory file recorded at LBN = 85. The directory file is composed of a plurality of file identification descriptors, and each file identification descriptor has information on each file included in the directory. The main information of each file identification descriptor is the file name of the file corresponding to the descriptor and the position information of the file entry.

The operation of the data recording / reproducing apparatus for reading a desired file from a disk having the above-mentioned UDF file system will be described below. FIG.
5 shows a logical structure of a directory / file in file management information according to the F standard.

In FIG. 19, the file set descriptor is recorded at a predetermined position in the partition space as a part of the file management information. The file set descriptor stores the recording position of the file entry for the ROOT directory file. The recording position of the file entry of the directory DIR1 is stored in the file identification descriptor in the ROOT directory file. There are a plurality of file identification descriptors in a file in the directory DIR1.
1 and FILE1_2 are stored.

An operation for obtaining a recording position of a target file in the case of having a hierarchical structure as shown in FIG. 19 will be described. Here, the file FILE1
It is assumed that _1 is a target file.

First, the contents of the ROOT directory file are read. That is, the location of the file entry in the ROOT directory is obtained from the file set descriptor. Then, the allocation descriptor is read from the file entry to obtain the position and length of the extent of the ROOT directory file.
Read the data of the OOT directory file. By scanning the obtained ROOT directory file information, a file identification descriptor that matches the target directory name DIR1 can be detected.

Next, the contents of the target directory file are read. That is, when a file identification descriptor matching the target directory is detected, the position information of the file entry is obtained from the contents of the file identification descriptor, and the file entry is read. The allocation descriptor is read from the file entry relating to the directory, the position and length of the extent recorded therein are obtained, and the data of the directory file is read.

Finally, in order to read the target file, the data of the read file in the directory DIR1 is scanned, and a file identification descriptor matching the target file name FILE1_1 is detected. When a file identification descriptor matching the target directory is detected, the location information of the file entry is obtained from the file identification descriptor and the file entry is read. Then, the allocation descriptor is read from the file entry, the position and length of the extent recorded therein are obtained, and the data of the target file FILE1_1 is read.

Next, the operation of the data recording device for recording data on a disk having the UDF file system structure will be described. Here, a case will be described in which FILE1_3 is further recorded under the directory DIR1 on a disk having the partition space shown in FIG.

First, the space bit map is scanned to obtain an unallocated logical block whose bit is "1". The data of FILE1_3 is recorded as an extent for the unallocated logical block. When the extent recording is completed, the FI
Record a file entry pointing to LE1_3.

At this time, the position information and the extent length of the extent representing FILE1_3 are recorded in the file entry as many as necessary as the allocation descriptor. F
Directory DI which is a parent directory of ILE1_3
The file identification descriptor indicating FILE1_3 is recorded in the file of R1.

The file identification descriptor includes FILE1
_3 file name and file entry position information are recorded. The bit in the space bitmap corresponding to the sector that has been allocated by the above processing is set to “0” (zero), and the allocated state is set.

As a result of the above processing, the logical volume space becomes as shown in FIG. The order of processing for the file management information is not particularly limited to the above example, and may be performed in another order.

[0038]

However, the above-mentioned UD
The file management method using F has the following problems. That is, in the UDF, a directory is recorded as a file in the partition space, and a file entry is also recorded in the partition space. Therefore, there is a possibility that these directory files and file entries are distributed and arranged on the disk.

Therefore, in a case where all files under a certain directory are to be read, if directory files and file entries are dispersed, a seek operation to the disk frequently occurs.

For example, in FIG. 20, FILE1_
File entries 1, FILE1_2, and FILE1_3 are distributed and arranged, and a seek operation is indispensable for reading them. Therefore, if the file to be reproduced is a file that requires real-time reproduction, such as an AV file,
The occurrence of the seek operation may make it difficult to realize the seek operation.

Similarly, when real-time recording such as an AV file is required, when recording a file entry after recording the AV data itself,
A seek operation to the disc occurs, and the recording of AV data during that time stops.

When starting up the apparatus, it is conceivable to reduce the number of seeks to the disk by reading all the file management information into the memory and performing on-memory processing. It occurs and takes time to start. Furthermore, since the required memory capacity cannot be predicted in advance, it becomes difficult to construct a system in which computer resources are efficiently arranged.

An object of the present invention is to provide an AV data recording apparatus and method capable of minimizing a seek operation even when a UDF file system is used in order to solve the above-mentioned problems. Aim.

[0044]

In order to achieve the above object, an AV data recording apparatus according to the present invention comprises a disk as a recording medium for AV data, a recording medium driving section for driving the disk, and data to the disk. A recording / reproducing unit for recording or reproducing recorded data, a memory unit for temporarily storing data, an AV signal processing unit for mutually converting an AV signal and a digital signal, and a system control unit for controlling a recording method An AV data recording device provided with file management information for managing continuous blocks on a disk as extents, grouping extents and managing them as files, and newly creating directories and files on the disk. At the same time, a reserved area for recording directory and file management information is Hoshi, in addition to the management information about the directory and file in the reserved area, characterized in that it also records usage information of the file management information.

With this configuration, it is not necessary to write the file attribute information and the file entry to the disk every time a file is created, and the number of seek operations can be greatly reduced. It is possible to reliably record and reproduce AV data that is large-capacity data.

Further, when updating the file management information recorded in the reserved area, the AV data recording apparatus according to the present invention records information indicating the fact that the file management information has been updated in the reserved area. Is preferred. Based on whether or not the file management information has been updated, it is possible to easily determine whether the attribute information needs to be written back, and it is possible to avoid unnecessary seek operations when the attribute information has not been rewritten. It is.

In the AV data recording apparatus according to the present invention, it is preferable that the head position block and the last position block of the reserved area on the disc be recorded in the reserved area. By referring to the start position block and the end position block of the reserved area, it is possible to easily specify the write position at the start of recording, and to avoid unnecessary seek operation for searching the write position. It is.

In the AV data recording apparatus according to the present invention, it is preferable that a head position block of a file entry area of the reservation area and a head position block of a file attribute information area are recorded in the reservation area. By referring to the start position block of the file entry area and the start position block of the file attribute information area in the reserved area, the write position at the start of recording can be easily specified, and unnecessary seek operations can be avoided. Because it can be.

Further, it is preferable that the AV data recording apparatus according to the present invention records the time at which the file management information was last updated in the reserved area. This is because the fact that the AV file has been written to the recording medium to be recorded can be easily determined by recording and comparing the last update date and time in the file management information.

The AV data recording apparatus according to the present invention divides a reserved area into N (N is a natural number of 2 or more)
Preferably, a file entry area is assigned to at least one of the divided areas, and a file attribute information area is assigned to at least one of the divided areas. This is because the write position at the start of recording can be easily specified, and unnecessary seek operation can be avoided.

Next, in order to achieve the above object, an AV data recording method according to the present invention manages continuous blocks on a disk as extents, and has AV management information having file management information for grouping extents and managing them as files. A data recording method, wherein a directory and a file are newly created on a disk, and at the same time, a reserved area for recording directory and file management information is secured in the file management information, and the directory and file management is performed in the reserved area. In addition to the information, information on the usage status of the file management information is also recorded.

With this configuration, it is not necessary to write the file attribute information and the file entry to the disk every time a file is created, and the number of seek operations can be greatly reduced. It is possible to reliably record and reproduce AV data that is large-capacity data.

Further, according to the AV data recording method of the present invention, when the file management information recorded in the reserved area is updated, information indicating the fact that the file management information has been updated in the reserved area is recorded. Is preferred. Based on whether or not the file management information has been updated, it is possible to easily determine whether the attribute information needs to be written back, and it is possible to avoid unnecessary seek operations when the attribute information has not been rewritten. It is.

Further, in the AV data recording method according to the present invention, it is preferable to record a head position block and a last position block of the reserved area on the disc in the reserved area. By referring to the start position block and the end position block of the reserved area, it is possible to easily specify the write position at the start of recording, and to avoid unnecessary seek operation for searching the write position. It is.

Further, in the AV data recording method according to the present invention, it is preferable that a head position block of a file entry area of the reservation area and a head position block of a file attribute information area are recorded in the reservation area. By referring to the start position block of the file entry area and the start position block of the file attribute information area in the reserved area, the write position at the start of recording can be easily specified, and unnecessary seek operations can be avoided. Because it can be.

In the AV data recording method according to the present invention, it is preferable that the time at which the file management information was last updated is recorded in the reserved area. This is because the fact that the AV file has been written to the recording medium to be recorded can be easily determined by recording and comparing the last update date and time in the file management information.

In the AV data recording method according to the present invention, the reserved area is divided into N (N is a natural number of 2 or more)
Preferably, a file entry area is assigned to at least one of the divided areas, and a file attribute information area is assigned to at least one of the divided areas. This is because the write position at the start of recording can be easily specified, and unnecessary seek operation can be avoided.

[0058]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an AV data recording apparatus according to an embodiment of the present invention will be described with reference to the drawings. Hereinafter, a file including audio data and video data compressed by the MPEG method or the like is referred to as an AV file. In this specification, a disc refers to, for example, DVD-RAM, MO, DVD-R, DVD-R
It means any recording medium having a disk shape such as an optical disk such as W, DVD + RW or a hard disk.

(First Embodiment) FIG. 1 shows a configuration diagram of an AV data recording apparatus according to a first embodiment of the present invention. FIG.
In the figure, 1 is a disk such as a magneto-optical disk, and 2 is a recording medium driving unit. For example, when the disk 1 is a magneto-optical disk, the recording medium driving unit 2 is composed of a spindle motor or the like.

Reference numeral 3 denotes a recording / reproducing unit, which comprises an optical pickup, a magnetic head, a servo circuit, a modulation / demodulation circuit and the like when the disk 1 is a magneto-optical disk. Reference numeral 4 denotes a memory unit which temporarily stores data when recording and reproducing data. Reference numeral 5 denotes a disk drive unit, which includes a disk 1, a recording medium driving unit 2, a recording / reproducing unit 3, and a memory unit 4.

Reference numeral 6 denotes an AV signal processing unit, which receives an M signal for an AV input signal input from, for example, a CCD camera or the like.
A process such as PEG compression is performed, or a process such as MPEG decoding is performed on AV data read from a disk medium and output to a monitor or the like. 8 denotes a system control unit,
The interface 7 controls the AV signal processing unit 6 and the disk drive unit 5.

In the AV data recording apparatus thus configured, at the time of data recording, the AV signal input to the AV signal processing unit 6 is subjected to image compression processing such as the MPEG method and then to the system control unit 8. Is transferred to the memory unit 4 according to the control of. Next, under the control of the system control unit 8, the recording medium drive unit 2 and the recording / reproducing unit 3 operate to record data on the memory unit 4 on the disk 1.

At the time of data reproduction, the recording medium drive unit 2 and the recording / reproduction unit 3 are controlled by the system control unit 8.
Operates, and the data recorded on the disk 1 is transferred to the memory unit 4. Next, under the control of the system control unit 8, data is read from the memory unit 4 and output as an AV signal from the AV signal processing unit 6.

FIG. 2 is a view showing an example of the file / directory structure immediately after a directory for recording an AV file is created in the first embodiment. In FIG. 2, ROOT enclosed by an ellipse indicates a root directory, AV_DIR1 indicates a directory in which an AV file is recorded, and AVFILES. IFO is directory AV_DIR
1 shows a management file created in the storage device 1.

FIG. 3 shows A according to the first embodiment of the present invention.
FIG. 3 is an exemplary view showing a data structure of a partition space in a state where a file / directory structure shown in FIG. 2 is recorded on a disk used in a V data recording device. In FIG. 3, a space bitmap descriptor is recorded in LBN = 0 to 79. Also, LBN = 251
Thereafter, since the state is "unallocated", each bit corresponding to these sectors is set to "1".

Furthermore, a file set descriptor is recorded in LBN = 80. If the file entry is a file entry of the root directory,
The location information is recorded in the file set descriptor. In LBN = 81, a termination descriptor is recorded.

Further, the file entry of the ROOT directory is stored in LBN = 82, the file identification descriptor of the ROOT directory and the directory AV_DIR1 as the parent directory is stored in LBN = 83, and the directory identification descriptor is stored in LBN = 84. AV_DIR
One file entry is recorded.

Next, in LBN = 85, the file identification descriptor of the directory AV_DIR1 as the parent directory and the AVFILES. The file identification descriptor of the IFO file is recorded. For LBN = 86, AVFI
LES. The file entry of the IFO file is recorded. In LBN = 87, AVFILES. The management area of the IFO file is recorded.

AVFILES. Figure 4 shows the IFO management area.
The configuration as shown in FIG. 4A is taken, and a block map as shown in FIG. 4B is recorded. Here, the block map is a map for managing the usage status of each LBN in LBN = 88 to 250. LBN = 88-25
0 is AVFILES. This is the extent of the IFO file, and the upper two bits of the allocation descriptor are set so that the extent is “allocated” and “unrecorded”.

Therefore, in the operation of the conventional file system, data cannot be written to LBN = 87-250. In the following, this AVFILES. IF
The extent of the O file is called an AV reserved area. As described above, since LBN = 0 to 250 is already “allocated”, the corresponding bit in the space bitmap is set to “0” (zero).

When an AV file is recorded on a disk in such a state, the recording is performed according to the procedure shown in the flowchart of FIG. When recording of an AV file is started by a user's instruction or the like, first, in FIG. 5, the contents of LBN = 0 to 250 on the disc 1 are read into the memory unit 4 (step S501). Next, the information of the AV reserved area on the memory unit 4 is scanned, and it is determined whether or not there is an unrecorded area enough to newly record the file attribute information and the file entry (step S502). If it is determined that there is not enough unrecorded area to newly record (step S502:
No), an error process is performed, and the recording of the AV file ends. If it is determined that there is a sufficient unrecorded area, the file attribute information and the file entry are recorded in the unrecorded area in the AV reserved area on the memory unit 4 (step S503).

At this time, by recording the file attribute information and the file entry, the extent size of the directory AV_DIR1 and the AVFILES. Since the size of the IFO file changes, the directory AV_
DIR1 file entry allocation descriptor and AVFILES. Rewrite the file entry of the IFO file.

Next, the space bit map on the memory unit 4 is scanned, and it is determined whether or not there are a continuous number of unrecorded logical blocks necessary for recording the AV file (step S504). If it is determined that there is no necessary number of consecutive unrecorded logical blocks (step S5
04: No), perform error processing, and end the AV file recording. If it is determined that there is, data is recorded in the logical block of the disk corresponding to the unrecorded area obtained in step S504 (step S505).

When the recording of the AV file data is completed,
In order to update the file management information of the AV file, information about the position and length of the extent of the AV file is recorded in the allocation descriptor in the file entry on the memory unit 4 created in step S503 (step S506). In addition to the allocation descriptor,
Necessary information such as a file name and a file creation time is also updated for the file attribute information and the file entry. At the same time, AVFILES. The block map in the IFO file is also rewritten according to the change.

Next, in the space bit map on the memory unit 4, the bit corresponding to the logical block in which the data is recorded in step S504 is changed to “0” indicating “allocated” (step S507). Then, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1 (step S508). When the file is recorded in this way, the AV file is recorded under the directory AV_DIR1.

When recording a plurality of AV files continuously, in the processing flow chart shown in FIG. 6, after the processing in step S601, steps S602 to S607 are repeated until the recording of all the AV files is completed. After all the AV files have been recorded, the process may proceed to step S608. Also at this time, step S605
In AVFILES. When adding a file entry and file attribute information in the extent of an IFO file, the AVFILE determines whether the file is already in use.
S. This is performed while using the block map in the IFO file.

As described above, according to the first embodiment, it is not necessary to write the file attribute information and the file entry to the disk every time a file is created, and it is possible to greatly reduce the number of seek operations. Therefore, large data A that requires real-time
It is also possible to record and reproduce V data.

Further, according to the processing shown in the flowchart of FIG. 5, the FILE1. DAT and FI
LE2. FIG. 7 shows the data structure of the partition space after DAT is recorded under directory AV_DIR1.
It becomes as shown in.

In FIG. 7, LBN in the AV reserved area
Is used to record a new file entry from a logical block having a large logical file. On the other hand, the file attribute information includes AVFILES. It is recorded by adding it to the end of the “allocated” and “unrecorded” extent of the IFO.

Since both the file identification descriptor and the file entry have variable-length data structures,
It is desirable to record the file identification descriptor from the smaller LBN of the V reserved area and record the file entry from the larger LBN.

AVFILES. When adding a file entry and file attribute information in the extent of an IFO file, the AVFILES. This is because it is possible to easily determine a free area by referring to the block map in the IFO file.

Note that the recording procedure is not limited to the processing procedure shown in FIG.
As described in No. 098/14938, prior to actual data recording, a plurality of continuous free areas are secured, and they are registered in the space bit map as “allocated state”, and then actual data is stored. Recording may be started.

Further, the update of the allocation descriptor of the directory AV_DIR1 and the information of the space bitmap may be collectively performed after the recording of the file data is completed.

The processing for setting the data structure of the partition space in the disk to the initial state as shown in FIG. 3 is performed when necessary before recording the AV file.

The directory / file name in which the AV file is recorded is not limited to the one described in the first embodiment, but may be another directory / file name.

When recording / reproducing, LBN = 0 to 250
Is stored in the memory unit 4. However, it is not necessary to store all the information in the memory unit 4. Only the information necessary for the recording / reproducing operation is stored, and only the information that needs to be updated is stored on the disk. It may be written back to 1.

Further, LBN = 87 to
250 to AVFILES. The “allocated” and “unrecorded” extent of the IFO file was
Regarding the recording position and capacity of the reserved area, LBN = 0 to 25
It is not limited to 0, and other recording positions and capacities may be used as long as they are secured as a continuous area on the disk.

Embodiment 2 Hereinafter, an AV data recording apparatus according to Embodiment 2 of the present invention will be described with reference to the drawings. In the first embodiment described above,
AVFILES. While the block map is recorded in the management area of the IFO file, the second embodiment records the change presence / absence flags of all the attribute information including the reserved area in addition to the block map. Has features.

That is, if LBN = 87, AVFIL
ES. The management area of the IFO file is recorded. AVF
ILES. The management area of the IFO has a configuration as shown in FIG. 4A, and records the change presence / absence flags of all the attribute information including the reserved area. Here, the change presence / absence flag is LB
It indicates whether any of N = 87 to 250 has been rewritten.

When an AV file is recorded on a disk using the change presence / absence flags of all the attribute information including the reserved area, the basic processing procedure is the same as the procedure shown in FIG.
However, in the space bit map on the memory unit 4, the bit corresponding to the logical block in which the data is recorded in step S504 is changed to “0” indicating “allocated” (step S507), and at the same time, AVFILE
S. The change presence / absence flag in the IFO file is also changed as if the attribute information was rewritten.

Then, AVFILES. The contents of the I / O file change presence / absence flag are confirmed, and if it is indicated that the attribute information has been rewritten, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1. If not, no write-back is performed. (Step S508). When the file is recorded in this way, the AV file is stored under the directory AV_DIR1.
The file has been recorded.

When a plurality of AV files are to be recorded continuously, in the processing flow chart shown in FIG. 6, after the processing in step S601, steps S602 to S607 are repeated until recording of all the AV files is completed. After all the AV files have been recorded, the process may proceed to step S608. Also at this time, step S608
In AVFILES. The contents of the I / O file change presence / absence flag are confirmed, and if it is indicated that the attribute information has been rewritten, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1. If not, no write-back is performed.

As described above, according to the second embodiment, A
VFILES. Based on the flag indicating whether or not the IFO file has been changed, it is possible to easily determine whether it is necessary to write back the attribute information, and it is possible to avoid unnecessary seek operations when the attribute information has not been rewritten. Embodiment 3 Hereinafter, an AV data recording apparatus according to Embodiment 3 of the present invention will be described with reference to the drawings. In the first embodiment, AVFILES. While the block map is recorded in the management area of the IFO file, the third embodiment records the start LBN of the reserved area and the end LBN of the reserved area in addition to the block map. Has features.

That is, AVFILE is set in LBN = 87.
S. The management area of the IFO file is recorded. AVFI
LES. The management area of the IFO has a configuration as shown in FIG. 4A, and the start LBN of the reserved area and the end LB of the reserved area
Record N. Here, the reserved area start LBN and the reserved area end LBN are the reserved area start LBN = 87 and the reserved area end LBN = 25 in the third embodiment.
It corresponds to 0.

When an AV file is recorded on a disc using the start LBN of the reserved area and the end LBN of the reserved area, the basic processing flow is the same as the procedure shown in the flowchart of FIG.

When recording the file attribute information and the file entry in the unrecorded area in the reserved AV area on the memory unit 4 (step S503), the AVFIL
ES. With reference to the start LBN in the IFO management area, the file attribute information is recorded from LBN = 87, and similarly, the end LBN of the reserved area is referenced, and the file entry is recorded from LBN = 250.

When all the processes are completed, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1. When the file is recorded in this way, the AV file is recorded under the directory AV_DIR1.

As described above, according to the third embodiment, the write position at the start of recording can be easily specified by referring to the start LBN of the reserved area and the end LBN of the reserved area. An unnecessary seek operation for searching for a writing position can be avoided. Embodiment 4 Hereinafter, an AV data recording apparatus according to Embodiment 4 of the present invention will be described with reference to the drawings. In the first embodiment, AVFILES. While the block map is recorded in the management area of the IFO file, in the fourth embodiment, in addition to the block map, the head position LBN of the file entry area and the head position LBN of the file attribute information area Is recorded.

That is, LFILE = 87 is set to AVFILE.
S. The management area of the IFO file is recorded. AVFI
LES. The management area of the IFO has a configuration as shown in FIG. 4A, and the head position LBN,
The head position LBN of the file attribute information area is recorded.
Here, the head position LBN of the file entry area and the head position LBN of the file attribute information area are the head position LB of the file entry area in the fourth embodiment.
N = 250, head position LBN of file attribute information area
= 87.

The head position LBN of the file entry area
Also, when an AV file is recorded on a disc using the head position LBN of the file attribute information area, the basic processing procedure is the same as the procedure shown in the flowchart of FIG.

If the file attribute information and the file entry are to be recorded in an unrecorded area in the AV reserved area on the memory section 4 (step S503), the AVFILES.
Referring to the head position LBN of the file entry area in the IFO management area, the file entry is LBN = 25.
0, the head position LBN of the file attribute information area
, The file attribute information is recorded from LBN = 87.

Then, in the space bit map on the memory unit 4, the bit corresponding to the logical block in which the data is recorded in step S504 is changed to "0" indicating "allocated" (step S507).

When all the processes are completed, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1. When the file is recorded in this way, the AV file is recorded under the directory AV_DIR1.

As described above, according to the fourth embodiment, the write position at the start of recording can be easily specified by referring to the start position LBN of the file entry area and the start position LBN of the file attribute information area. And unnecessary seek operation can be avoided.

(Embodiment 5) Hereinafter, an AV data recording apparatus according to Embodiment 5 of the present invention will be described with reference to the drawings. In the first embodiment, AVFILES.
While the block map is recorded in the management area of the IFO file, the fifth embodiment is characterized in that the last update date and time are recorded in addition to the block map.

That is, LFILE = 87 is AVFILE.
S. The management area of the IFO file is recorded. AVFI
LES. The IFO management area has a configuration as shown in FIG. 4A, and records the last update date and time. Here, the last update date and time is AVFILES. This is the date and time when the IFO file was rewritten.

When an AV file is recorded on a disc using the last update date and time, the basic processing procedure is the same as the procedure shown in the flowchart of FIG.

If the file attribute information and the file entry are to be recorded in the unrecorded area in the AV reserved area on the memory unit 4 (step S503), the directory attribute is recorded by recording the file attribute information and the file entry.
DIR1 extent size and AVFILES. I
Since the size of the FO file changes, the allocation descriptor of the file entry in the directory AV_DIR1 and the AVFILES. Rewrite the file entry of the IFO file.

Furthermore, besides the allocation descriptor,
Necessary information such as a file name and a file creation time is also updated for the file attribute information and the file entry. At this time, AVFILES. The last update date and time in the IFO file is updated to the latest date and recorded.

When all the processes are completed, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1. When the file is recorded in this way, the AV file is recorded under the directory AV_DIR1.

Originally, when an AV file was recorded, AVFILES. Rewriting of the IFO file management area occurs. Therefore, the last update information described in the file entry of each of the recorded AV files and the AVFILES. The last update date and time in the IFO file always matches.

However, when a file is written by another recording device by a method different from that of the fifth embodiment, the AVFILES. No rewriting of the IFO file management area occurs. In this case, the last update date and time information described in each file entry and the AVFI
LES. Since the last update date and time in the IFO file no longer match, it can be seen that processing other than recording of the AV file has been performed.

As described above, according to the fifth embodiment, A
The fact that the AV file has been written to the medium in which the V file is to be recorded is indicated by AVFILES. The determination can be easily made by recording and comparing the last update date and time in the management area of the IFO file, so that an unnecessary seek operation when recording the AV file can be avoided.

Embodiment 6 Hereinafter, an AV data recording apparatus according to Embodiment 6 of the present invention will be described with reference to the drawings. In the first embodiment, AVFILES.
While the block map is recorded in the management area of the IFO file, in the sixth embodiment, the management area is divided into a plurality of areas other than the above, and a file entry is allocated to at least one of the divided management areas. , At least one
This is characterized in that file attribute information is assigned to each of them and recorded.

FIG. 8 shows A according to the sixth embodiment of the present invention.
FIG. 3 is an exemplary diagram of a data structure of an initial partition space in a disk used in a V data recording device. In FIG. 8, a space bitmap descriptor is recorded in LBN = 0 to 79. Further, since LBN = 251 or later, the state is “unallocated state”, and each bit corresponding to these sectors is set to “1”.

As shown in FIG. 8, LBN = 88 to 250
Of the unrecorded area in the AV reserved area of LBN = 88 to 16
9 and LBN = 170 to 250, and each is allocated as a file entry area and a file attribute information area.

In LBN = 87, AVFILES. IF
The management area of the O file is recorded. AVFILES.
The management area of the IFO file has a configuration as shown in FIG. 9, and the head position LB of the allocated file entry area
N, the head position LBN of the file attribute information area is recorded. Here, the head position LB of the file entry area
N, the head position LBN of the file attribute information area corresponds to the head position LBN of the file entry area = 170 and the head position LBN = 87 of the file attribute information area in the sixth embodiment.

When an AV file is recorded on a disk in such a state, the recording is performed according to the procedure shown in the flowchart of FIG. First, LBN = 0 to 250 on the disk 1
Is read into the memory unit 4 (step S50).
1). Next, the information of the AV reserved area on the memory unit 4 is scanned to determine whether there is an unrecorded area enough to newly record the file attribute information and the file entry (step S).
502). If it is determined that there is not enough unrecorded area for newly recording (step S502: No), error processing is performed and the AV file recording ends. If it is determined that there is a sufficient unrecorded area, the file attribute information and the file entry are recorded in the unrecorded area in the AV reserved area on the memory unit 4 (step S503).

Here, regarding the file entry, AV
FILES. LBN = 170 with reference to the head position LBN of the file entry area in the IFO management area
, And the file attribute information is also referred to as LBN = 8 with reference to the head position LBN of the file attribute information area.
Record from 7.

At this time, by recording the file attribute information and the file entry, the extent size of the directory AV_DIR1 and the AVFILES. Since the size of the IFO file changes, the directory AV_
DIR1 file entry allocation descriptor and AVFILES. Rewrite the file entry of the IFO file.

Next, the space bit map on the memory unit 4 is scanned, and it is determined whether or not there are a continuous number of unrecorded logical blocks necessary for recording the AV file (step S504). If it is determined that there is no necessary number of consecutive unrecorded logical blocks (step S5
04: No), perform error processing, and end the AV file recording. If it is determined that there is, data is recorded in the logical block of the disk corresponding to the unrecorded area obtained in step S504 (step S505).

When recording of the AV file data is completed,
In order to update the file management information of the AV file, information about the position and length of the extent of the AV file is recorded in the allocation descriptor in the file entry on the memory unit 4 created in step S503 (step S506).

Next, in the space bit map on the memory unit 4, the bit corresponding to the logical block in which the data is recorded in step S504 is changed to “0” representing “allocated” (step S507). Then, the contents of the memory unit 4 are written back to the position of LBN = 0 to 250 on the disk 1 (step S508). When the file is recorded in this way, the AV file is recorded under the AV_DIR1 directory. The partition space after the AV file is recorded is shown in FIG.
It has a configuration like 0.

As described above, according to the sixth embodiment, the management area is divided into a plurality of areas, file entries are assigned to at least one of the divided management areas, and file attribute information is assigned to at least one of the divided management areas. The write position at the start of recording can be easily determined.
It is possible to avoid unnecessary seek operations when recording a file.

[0125]

As described above, according to the present invention, by recording file management information and attribute information of an AV file in a continuous area secured in advance, a disc which hinders real-time recording and reproduction of an AV file is recorded. Can be minimized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an AV data recording apparatus according to a first embodiment of the present invention.

FIG. 2 is an exemplary diagram of an initial directory structure in the AV data recording device according to the first embodiment of the present invention;

FIG. 3 is an exemplary diagram of an initial partition space in the AV data recording device according to the first embodiment of the present invention;

FIG. 4 is an exemplary diagram of a recording area of file management information in the AV data recording device according to the first embodiment of the present invention;

FIG. 5 is a flowchart of an AV file recording process in the AV data recording apparatus according to the first embodiment of the present invention;

FIG. 6 is a flowchart of an AV file recording process in the AV data recording apparatus according to the first embodiment of the present invention;

FIG. 7 is an exemplary diagram of a partition space after recording an AV file in the AV data recording device according to the first embodiment of the present invention;

FIG. 8 is an exemplary diagram of an initial partition space in an AV data recording device according to a sixth embodiment of the present invention.

FIG. 9 is an exemplary diagram of a recording area of file management information in an AV data recording apparatus according to a sixth embodiment of the present invention.

FIG. 10 is a view showing an example of a partition space after recording an AV file in an AV data recording apparatus according to a sixth embodiment of the present invention;

FIG. 11 is a configuration diagram of a conventional AV data recording device.

FIG. 12 is an exemplary diagram of a volume space structure in a conventional AV data recording device.

FIG. 13 is a view showing an example of a partition space in a conventional AV data recording apparatus.

FIG. 14 is a view showing an example of a directory structure in a conventional AV data recording apparatus.

FIG. 15 is a view showing an example of a file entry in a conventional AV data recording apparatus.

FIG. 16 is a view showing an example of an allocation descriptor in a conventional AV data recording apparatus.

FIG. 17 is an explanatory diagram of an interpretation of an extent length in a conventional AV data recording apparatus.

FIG. 18 is a view showing a configuration example of a directory file in a conventional AV data recording apparatus.

FIG. 19 is a view showing an example of a hierarchical structure of a file in a conventional AV data recording apparatus.

FIG. 20 is a view showing an example of a partition space after recording in a conventional AV data recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Disk 2, 102 Recording medium drive part 3, 103 Recording / reproduction part 4, 104 Memory part 5, 105 Disk drive unit 6, 106 AV signal processing part 7, 107 System control part

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masafumi Shimodadai 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yasumori Hino 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. AA17 AA19 AA27 AA29 DA03 DA04 DA11 DA18 DB09 DC05 DC15 DD07

Claims (14)

[Claims] 1. A disk as a recording medium for AV data, a recording medium driving unit for driving the disk, a recording and reproducing unit for recording data on the disk or reproducing the recorded data, An AV data recording device comprising: a memory unit for storing data; an AV signal processing unit for mutually converting an AV signal and a digital signal; and a system control unit for controlling a recording method. It has file management information for managing as extents, grouping the extents and managing them as files, and newly creating directories and files on the disk and recording management information about the directories and files in the file management information. Reserve a reserved area for the directory in the reserved area In addition to the management information on fine file, AV data recording apparatus characterized by also recording information about the usage of the file management information. 2. The method according to claim 1, wherein when the file management information recorded in the reserved area is updated, information indicating the fact that the file management information has been updated is recorded in the reserved area. AV data recording device. 3. The AV data recording apparatus according to claim 1, wherein a start position block and an end position block of the reserved area on the disc are recorded in the reserved area. 4. The AV data recording apparatus according to claim 1, wherein a head position block of a file entry area of the reservation area and a head position block of a file attribute information area are recorded in the reservation area. 5. The A according to claim 1, wherein the time at which the file management information was last updated is recorded in the reserved area.
V data recording device. 6. The reserved area is divided into N (N is a natural number of 2 or more), a file entry area is assigned to at least one of the divided areas, and a file attribute information area is assigned to at least one of the divided areas. The AV data recording apparatus according to claim 1, wherein the recording is performed by recording. 7. An A file having file management information for managing continuous blocks on a disk as an extent, grouping the extents and managing them as a file.
V data recording method, wherein a directory and a file are newly created on the disk, and at the same time, a reserved area for recording the management information on the directory and the file is secured in the file management information, An AV data recording method, further comprising recording information on the use status of the file management information in addition to the management information on the directory and the file. 8. The method according to claim 7, wherein when the file management information recorded in the reserved area is updated, information indicating the fact that the file management information has been updated is recorded in the reserved area. AV data recording method. 9. The AV data recording method according to claim 7, wherein a start position block and an end position block of the reserved area on the disc are recorded in the reserved area. 10. A head position block of a file entry area of the reservation area and a head position block of a file attribute information area of the reservation area are recorded in the reservation area.
Described AV data recording method. 11. The AV data recording method according to claim 7, wherein the time at which the file management information was last updated is recorded in the reserved area. 12. The reserved area is divided into N (N is a natural number of 2 or more), a file entry area is assigned to at least one of the divided areas, and a file attribute information area is assigned to at least one of the divided areas. Claim 7
Described AV data recording method. 13. A disc recorded by the AV data recording device according to claim 1. 14. A disc recorded by the AV data recording method according to any one of claims 7 to 12.