JP2007058987A - Device and method for reproducing optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk reproducing device and method for shortening disk analysis time of a write-once or rewritable optical disk. <P>SOLUTION: A necessary data extraction unit 10 for analysis comprises: an identification ID extraction part 11 which extracts the identification ID of an optical disk 2 from a signal read from the optical disk 2 and records it in a nonvolatile memory 6; a recording time extraction part 12 which extracts time of recording when information has been recorded on the optical disk 2 from the signal output by an optical disk control part 3 and which records the time in the nonvolatile memory 6; and a descriptor recording address determining part 13 which extracts an analysis start position necessary for creating a path table showing a hierarchical relationship of a directory and a file from a signal for analyzing the optical disk 2, creates a virtual-real physical address conversion table for converting a virtual address when creating the path table to a real physical address, determines the recording address of a descriptor describing the recording address of this virtual-real physical address, and makes the nonvolatile memory 6 record the recording address of the descriptor therein. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disk playback apparatus and method, and more particularly to an optical disk playback apparatus and method used for disk analysis.

For example, when analyzing a file in an optical disc recorded in accordance with UDF (Universal Disk Format) defined by OSTA (Optical Storage Technology Association), at least FIG. It is necessary to perform analysis sequentially by following the procedure. However, in this analysis procedure, it is necessary to read a plurality of descriptors (descriptors) distributed on the disk, and it takes time to search for data (seek). Compared with ISO9660 etc., a long time is required for analysis. In particular, in a write-once disc (CD-R, etc.) recorded based on the revision (Revision) after UDF 1.50, information on a virtual allocation table (hereinafter referred to as VAT-Virtual Allocation Table) is used. Since the control block (hereinafter referred to as ICB -Information Control Block-) is recorded at the position immediately before the lead out (lead out), the distance from other descriptors (descriptors) is increased, The analysis time is a factor.
JP 2003-244593 A JP 2003-059239 A JP 2000-227865 A

  An object of the present invention is to provide an optical disk reproducing apparatus and method for shortening the time required for disk analysis of a write-once or rewritable optical disk.

  An optical disc playback apparatus according to a first aspect is an optical disc playback apparatus using a recording format including a virtual address obtained by virtualizing a real physical address including directory and file information recorded on an optical disc to facilitate additional recording, An identification ID extraction unit that extracts an identification ID of the optical disk from a signal read from the optical disk and stores the identification ID in the nonvolatile memory; and a recording time when information is recorded on the optical disk is extracted from the signal and stored in the nonvolatile memory A recording time extraction unit, and a virtual address used to create the path table by extracting a start position required for creating a path table indicating a hierarchical relationship between directories and files from the signal in order to analyze the optical disc. Virtual-real physical address translation to translate to real physical address A required data for analysis, including a descriptor recording address determination unit that creates a table and determines a recording address of a descriptor in which the recording address of the virtual-real physical address conversion table is described and stores it in the nonvolatile memory A unit is provided.

  The optical disc reproducing method according to the second aspect is an optical disc reproducing method using a recording format including a virtual address obtained by converting a real physical address including a directory and file information recorded on the optical disc into a virtual address for easy appending. An identification ID of the optical disk is extracted from a signal read from the optical disk and stored in a nonvolatile memory, a recording time when information is recorded on the optical disk is extracted from the signal and stored in the nonvolatile memory, and the optical disk is An analysis start position necessary for creating a path table indicating a hierarchical relationship between directories and files is extracted from the signal for analysis, and a virtual address for converting the virtual address used when creating the path table into a real physical address is obtained. A physical address conversion table is created and the virtual- Determining the recording address of the descriptor describing the recording address of the physical address conversion table and storing it in the nonvolatile memory, and using the necessary data for analysis stored in the nonvolatile memory for the next analysis Features.

  According to the above optical disk reproducing apparatus and method, the time required for disk analysis of a write-once or rewritable optical disk can be shortened.

  Hereinafter, first to sixth embodiments will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 shows a schematic configuration of an optical disk reproducing apparatus and method according to the first embodiment, and FIG. 2 shows an analysis from AVDP of a UDF formatted optical disk to a file entry (hereinafter referred to as FE-File Entry) of a root directory. The procedure is shown. FIG. 3 is a flowchart showing UDF file analysis firmware, FIG. 4 is a disk information table for file analysis for the second time and later, and FIG. 5 is a flowchart for analyzing files using previously analyzed disk information. .

  In FIG. 1, an optical disc playback apparatus 1 is an optical disc playback apparatus using a recording format including a virtual address obtained by converting a real physical address including a directory and file information recorded on an optical disc 2 into a virtual address in order to facilitate additional recording. . This optical disc playback apparatus 1 reads out control information and data recorded on an optical disc 2 and outputs a control signal / data, and inputs a control signal / data output from the optical disc control unit 3 to the outside. A processor 4 that outputs an I / F signal, a volatile memory 5 that stores data read by the optical disc control unit 3 via the processor 4, and a nonvolatile memory 6 that stores processing contents of the processor 4. I have. The processor 4 includes an analysis necessary data recording unit 10 as firmware.

  The analysis necessary data extraction unit (firmware) 10 takes out the identification ID of the optical disk 2 from the signal read from the optical disk 2 and records it in the nonvolatile memory 6, and the output of the optical disk controller 3. A recording time extraction unit 12 that extracts a recording time when information is recorded on the optical disc 2 from the signal to be recorded and records the recording time in the nonvolatile memory 6, and a path table that indicates a hierarchical relationship between directories and files from the signal in order to analyze the optical disc 2. A virtual-real physical address conversion table for converting a virtual address to a real physical address when creating the path table by taking out the analysis start position necessary to create and recording this virtual-real physical address conversion table The recording address of the descriptor describing the address is fixed and the nonvolatile memory 6 A descriptor record address determination unit 13 to be recorded, and a.

  The descriptor recording address determination unit 13 also includes an analysis position extraction unit 14 that extracts an analysis start position necessary to create a path table, and a virtual-real physical address conversion table that converts a virtual address to the real physical address. It further includes a table creation unit 15 to create, and an address creation unit 16 to create a recording address of a descriptor describing a recording address of the virtual-real physical address conversion table.

  The nonvolatile memory 6 includes an identification ID storage area 21 that stores an identification ID extracted from a signal, a recording time storage area 22 that stores a recording time extracted from the signal, and an analysis that stores an analysis start position extracted from the signal. Start position storage area 23, table storage area 24 for storing the virtual-real physical address conversion table, table address storage area 25 for storing the recording address in the nonvolatile memory 6 of the virtual-real physical address conversion table, and nonvolatile memory of the table 6 is provided with a descriptor address storage area 26 for storing a recording address of a descriptor describing a recording address in FIG.

  The operation based on the above configuration will be described. First, the optical disc reproducing apparatus 1 has an anchor volume descriptor pointer (hereinafter referred to as AVDP-Anchor Volume Descriptor) in 256 or 512 sectors, or in the last sector N or N-256 sector of the net data recorded on the disc. Search for Pointer. In this AVDP, the recording addresses of the main volume descriptor sequence (hereinafter referred to as MVDS-Main Volume Descriptor Sequence-) and the reserved volume descriptor sequence (hereinafter referred to as RVDS-Reserved Volume Descriptor Sequence-) are the number of logical blocks. (Hereinafter referred to as LBN—Logical Block Number—). Next, the data of the corresponding sector of MVDS (or RVDS) is read from this recording address, and the volume descriptor pointer (hereinafter referred to as VDS-Volume Descriptor Pointer-) is analyzed in order.

  During the VDS, a primary volume descriptor (hereinafter referred to as PVD-Primary Volume Descriptor), a partition descriptor (hereinafter referred to as PD-Partition Descriptor), a logical volume descriptor (hereinafter referred to as LVD-Logical Volume Descriptor-) There is a descriptor (descriptor). Among these, in the PVD, a volume label (Volume Label) as an identification ID of the optical disc 2, a time stamp (Timestamp) as a recording time when information is recorded on the optical disc, and the like are recorded. Also, in the LVD, information such as the presence / absence of a revised version (revision) of UDF and a VAT / sparing table (VAT / sparing table) is recorded. In addition, a partition starting location is recorded in the PD. Among these pieces of information, the optical disc playback apparatus 1 needs to know at least the presence / absence of a VAT (virtual placement table) in the LVD (logical volume descriptor) and the partition start position.

  Next, the optical disc reproducing apparatus 1 describes a file entry (hereinafter referred to as FE-File Entry-) in the root directory in order from the partition starting location (Partition Starting Location) analyzed by the PD (partition descriptor). The file set descriptor (hereinafter referred to as FSD-File Set Descriptor) is searched. At this time, if the revision (revision) of the UDF is 1.50 or later and the VAT (virtual placement table) exists, the location of the extension location (Extension Location) recorded in the FSD is Since the index value of the VAT (virtual placement table) is shown, it is necessary to read the VAT and convert it from a virtual value to an actual physical value.

  The VAT necessary for this address conversion is described in the VAT / ICB (virtual allocation table / information control block) recorded in the last sector of the net data recorded on the disc (when VAT is small). May be embedded in a recorded sector of VAT / ICB). In the optical disc reproducing apparatus 1 according to the first embodiment, the analysis position extraction unit 14 searches for and analyzes the VAT / ICB, checks the position of the VAT, and then searches and analyzes the VAT.

  Once the location of the FE of the root directory (Root Directory) is found from the FSD-file set descriptor- (and VAT-virtual placement table-), the directory and file information are sequentially read from the sector, and all file information is analyzed. Then, the file analysis ends.

  As shown in FIG. 2, each descriptor in the above-described series of analysis procedures is not necessarily recorded in a physically close place. Among them, VAT / ICB is the net data recorded on the disc. Since it is stipulated that the data must be recorded in the last sector, data seek takes time.

  Therefore, in the analysis procedure shown in FIG. 3, the volume label (Volume Label) indicated by PVD-primary volume descriptor- and the value of timestamp (Timestamp), and the revised version (revision indicated by LVD-logical volume descriptor-) -Revision-) version value, FE position of root directory (Root Directory) indicated by file set descriptor (FSD-File Set Descriptor-), LBA value in VAT (virtual placement table), flash memory, etc. Is recorded in the non-volatile 6 memory area (for example, the descriptor address storage area 25 in FIG. 1) and used for the next disk analysis so as to shorten the analysis time in the second and subsequent file analysis. To. FIG. 4 shows an example of a table of disk information to be used at the next analysis. Values necessary for these tables are acquired at the time of the initial analysis of the disk shown in FIG. 3 and recorded in the descriptor address storage area 26 of the nonvolatile memory 6.

  FIG. 5 shows a state in which file analysis is performed based on the above-mentioned values recorded in advance based on the disc information of the optical disc 2 recorded in advance in the memory 6. The analysis procedure from the analysis of the anchor volume descriptor pointer (AVDP) to the analysis of the partition volume descriptor (PVD) is the same, but the subsequent procedure is different from FIG. That is, in the PVD analysis, first, it is determined whether or not the volume name matches the data stored in advance. If the analysis result matches the stored data, then the value of the time stamp (Timestamp) is checked. . At this time, if the respective information matches and the revision version of the UDF is 1.02, the LVD (logical Analysis of the volume descriptor), PD (partition descriptor), and FSD (file set descriptor) is omitted, and the file analysis is performed immediately.

  Further, when the UDF revision (UDF Revision) version 1.50 or later is recorded on the write-once optical disc 2 (that is, when the virtual arrangement table -VAT- is used), the virtual arrangement table / information is recorded. If the positions of the control blocks (VAT / ICB) match, it is determined that the contents of the optical disc 2 have not been changed, and the value of the virtual arrangement table recorded in advance is used, and the LVD (logical volume) In addition to analysis of descriptors), PD (partition descriptors), and FSD (file set descriptors), analysis of VAT / ICB and analysis of VAT are omitted. By omitting the VAT / ICB analysis and the VAT analysis, the analysis time can be considerably shortened. Also, if information on a plurality of disks is recorded in the nonvolatile memory, the file analysis time for the second and subsequent times of each disk can be shortened. In the above method, if any one item does not match in the comparison with the value stored in the memory in advance, normal file analysis is performed.

  To summarize the above description, the optical disc playback method according to the first embodiment has a recording format including a virtual address obtained by converting a real physical address including a directory and file information recorded on the optical disc into a virtual address for easy appending. An optical disk reproducing method to be used, wherein an identification ID of the optical disk is extracted from a signal read from the optical disk and stored in a nonvolatile memory, and a recording time when information is recorded on the optical disk is extracted from the signal and is nonvolatile The analysis start position necessary for creating a path table indicating the hierarchical relationship of directories and files is extracted from the signal to be stored in a memory and the optical disk is analyzed, and a virtual address for creating the path table is implemented. Virtual to real physical address conversion A record address of the descriptor describing the record address of the virtual-real physical address conversion table is stored and stored in the nonvolatile memory, and the necessary data for analysis stored in the nonvolatile memory is stored. This is used for the next analysis.

[Second Embodiment]
In the first embodiment, the value of the virtual arrangement table (VAT) is stored. However, when the number of directories and files recorded on the optical disc 2 is very large, the number of logical blocks (VAT / LBN) in the virtual arrangement table As a result, the value of becomes large and consumes memory capacity. Therefore, the position of the virtual arrangement table (VAT) indicated by the virtual arrangement table / information control block (VAT / ICB) is recorded. Since 512 VATs are recorded per sector, the used memory capacity can be compressed to 1/512 compared to the first embodiment.

  FIG. 6 shows a disk information table for file analysis (VAT LBN position recording version), not the value of VAT logical block addressing (hereinafter referred to as LBA-Logical block Addressing-) but the VAT position (LBN). The described disk information table is shown. FIG. 7 is a file analysis flow when the VBN LBN value is used, and shows a flow when file analysis is performed based on the information described in FIG. That is, FIG. 6 shows disk information stored in advance, and FIG. 7 shows a state in which disk analysis is performed based on values of a virtual arrangement table (VAT) recorded in advance.

  Similar to the optical disc playback apparatus of the first embodiment, after comparing the volume (Volume) name in the partition volume descriptor (PVD) and the time stamp (Timestamp), the revision version (Revision) version of the UDF is confirmed. If the volume name and the time stamp match and the UDF revision version is 1.02, the same analysis procedure as in the first embodiment is performed. If the volume (Volume) name and the time stamp (Timestamp) match and the VAT / ICB position matches, the VAT analysis is performed to obtain the LBA (logical block addressing) value, and then the root directory (Root Directory) and subsequent file analysis. By this method, access to LVD, PD, FSD, and VAT / ICB can be omitted.

[Third Embodiment]
FIG. 8 is a flow of file analysis when additional VAT is acquired, and shows a file analysis flow when comparing VAT ICB and acquiring the additional VAT LBA. FIG. 9 shows the state of the table information at the time of additional VAT acquisition shown in FIG.

  Also in the third embodiment, as in the first embodiment described above, information necessary for disk analysis including the LBA (logical block addressing) value of VAT is secured in advance. In a disc recorded with UDF 1.50 or later, when the volume (Volume) name and time stamp (Timestamp) match and VAT / ICB does not match, the result of VAT / ICB analysis (VAT position) is recorded in advance. Then, only the information of the added VAT is analyzed, and the file analysis is performed by using the LBA value of the added VAT and the LBA value recorded in the memory in advance. By analyzing only the added VAT value, the VAT analysis time can be reduced especially when the number of files is large. FIG. 8 shows a flow at the time of file analysis, and FIG. 9 shows how the VAT LBA value is added to the disk information table.

[Fourth Embodiment]
FIG. 10 shows prioritized disk information, and shows a disk information table according to the fourth embodiment in which the total number of analyzes is recorded and prioritized for information necessary for disk analysis.

  Although the time required for disk analysis can be shortened by the method shown in the first to third embodiments described above, since the memory capacity is finite, information on all analyzed disks cannot be stored.

  Therefore, in the fourth embodiment, when performing disk analysis using information recorded in advance in the memory, the number of times of analysis is added to the information used in the first to third embodiments as shown in FIG. Record. When a plurality of discs are analyzed and the disc information recorded in the memory becomes full, the disc information with a small total number of analyzes is overwritten. By preferentially leaving information on the optical disk 2 that is frequently analyzed, the hit rate of the disk information can be increased.

[Fifth Embodiment]
In the above-described first to fourth embodiments, the recording addresses of descriptors as descriptors are merely stored together in the storage area 25. However, the present invention is not limited to this, and The storage area itself may be collected and stored in one place.

  FIG. 11 shows a fifth embodiment in which the arrangement of the storage area of each descriptor is replaced with an easy-to-read arrangement as described above. Each descriptor is collected near the end of the session. The reason why the AVDP exists at the position N-256 of the logical block number LBN is that the AVDP can be placed at this position according to the standard. That is, the standard stipulates that AVDP should be placed in two or more places among the 256th, 512th and N-256th sectors. If descriptors are collectively arranged near the end of the session, the analysis time is further shortened when AVDP is arranged in N-256.

1 is a schematic configuration diagram showing an optical disk reproducing device according to a first embodiment as a basic concept. Explanatory drawing which shows the UDF file analysis procedure in 1st Embodiment. The analysis flowchart which shows the analysis firmware of a UDF file. Explanatory drawing which shows the disk information table for file analysis. The flowchart which shows the flow of the file analysis after the 2nd time of the same disk. Explanatory drawing which shows the disk information table for file analysis of 2nd Embodiment. The flowchart which shows the flow which performs file analysis based on the information of FIG. The flowchart which shows the file analysis at the time of LBA addition part acquisition of VAT in 3rd Embodiment. Explanatory drawing which shows the table information at the time of VAT addition acquisition shown in FIG. Explanatory drawing which shows the disk information table prioritized in 4th Embodiment. Explanatory drawing which shows the analysis procedure which made arrangement | positioning easy to read each descriptor in 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk reproducing apparatus 2 Optical disk 4 Processor 6 Non-volatile memory 10 Necessary data extraction unit 11 for analysis 11 Identification ID extraction part 12 Recording time extraction part 13 Descriptor recording address determination part 14 Analysis position extraction part 15 Table preparation part 16 Address preparation part 21 Identification ID storage area 22 Recording time storage area 23 Analysis start position storage area 24 Table storage area 25 Table address storage area 26 Descriptor address storage area

Claims (5)

An optical disk playback apparatus using a recording format including a virtual address obtained by virtualizing a real physical address including directory and file information recorded on an optical disk to facilitate additional recording,
An identification ID extraction unit that extracts an identification ID of the optical disk from a signal read from the optical disk and stores it in a nonvolatile memory; and a recording time at which information is recorded on the optical disk is extracted from the signal and stored in the nonvolatile memory And a virtual address when the path table is created by extracting the analysis start position necessary for creating a path table indicating the hierarchical relationship between directories and files from the signal to analyze the optical disc. A descriptor that creates a virtual-real physical address conversion table for converting a virtual physical address into a real physical address, determines the recording address of the descriptor that describes the recording address of the virtual-real physical address conversion table, and stores the determined address in the nonvolatile memory And a necessary data extraction unit for analysis including a recording address determination unit Optical disk reproducing apparatus, characterized in that.   The descriptor recording address determination unit includes an analysis position extraction unit that extracts an analysis start position necessary for creating the path table, and the virtual-real physical address conversion table that converts the virtual address to the real physical address. A table creation unit for creating, and an address creation unit for creating a recording address of a descriptor describing a recording address of the virtual-real physical address conversion table, wherein the nonvolatile memory is extracted from the signal An identification ID storage area for storing an identification ID, a recording time storage area for storing the recording time extracted from the signal, a table storage area for storing the virtual-real physical address conversion table, and the virtual-real physical A table address storage area for storing the recording address in the nonvolatile memory of the address conversion table; The optical disk reproducing apparatus according to claim 1, characterized in that it comprises a descriptor address storage area for storing recording address of the descriptor that describes the recording address in the nonvolatile memory of the serial table. An optical disc playback method using a recording format including a virtual address obtained by converting a real physical address including a directory and file information recorded on an optical disc into a virtual address to facilitate additional recording,
Taking out the identification ID of the optical disc from the signal read from the optical disc, and storing it in a non-volatile memory;
Taking out the recording time when the information was recorded on the optical disc from the signal and storing it in a nonvolatile memory,
In order to analyze the optical disc, an analysis start position necessary for creating a path table indicating a hierarchical relationship between directories and files is extracted from the signal,
Create a virtual-real physical address conversion table that converts a virtual address when creating the path table into a real physical address,
Determine the recording address of the descriptor describing the recording address of the virtual-real physical address conversion table and store it in the nonvolatile memory;
A method of reproducing an optical disk, comprising: using necessary data for analysis stored in the non-volatile memory for the next analysis.   When the optical disk is newly analyzed, the recording of the identification ID of the optical disk, the recording time when the information is recorded on the optical disk, and the descriptor that records the position of the virtual-real physical address conversion table Part of file analysis by using the previously analyzed virtual-real physical address conversion table and the information on the optical disc when the three required information with the address matches the value stored in the non-volatile memory in advance The method of reproducing an optical disk according to claim 3, wherein: is omitted.   When the optical disk is newly analyzed, the recording of the identification ID of the optical disk, the recording time when the information is recorded on the optical disk, and the descriptor that records the position of the virtual-real physical address conversion table The virtual-real physical address conversion table when the new part of the virtual-real physical address conversion table was previously analyzed when the three necessary information with the address does not match the value stored in the nonvolatile memory in advance The optical disk reproducing method according to claim 3, further comprising:

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