JP3692068B2 - Recording / reproducing apparatus and recording medium inspection method - Google Patents

Recording / reproducing apparatus and recording medium inspection method Download PDF

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Publication number
JP3692068B2
JP3692068B2 JP2001375918A JP2001375918A JP3692068B2 JP 3692068 B2 JP3692068 B2 JP 3692068B2 JP 2001375918 A JP2001375918 A JP 2001375918A JP 2001375918 A JP2001375918 A JP 2001375918A JP 3692068 B2 JP3692068 B2 JP 3692068B2
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Japan
Prior art keywords
recording
recording medium
information
file
data
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP2001375918A
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Japanese (ja)
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JP2003178536A (en
Inventor
精悟 伊藤
正志 堀口
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株式会社東芝
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an information processing apparatus, and more particularly to a recording / playback apparatus that records and plays back video on a recording medium such as a DVD in which a file system is constructed.
[0002]
[Prior art]
In recent years, a moving image-compatible optical disk reproducing apparatus for reproducing an optical disk on which data such as video and audio is recorded has been developed. Among them, the DVD standard that uses the internationally standardized MPEG2 (Moving Image Coding Expert Group) method and the AC3 audio compression method has been defined. According to the MPEG2 system layer, this standard supports the MPEG2 system as a moving picture compression system, and supports the AC3 audio compression system and the MPEG audio compression system as audio compression systems.
[0003]
Also, as the standard of the media itself, the DVD-RAM standard (4.7 GB) has been completed following the DVD-ROM standard, which is a DVD-video medium, and the DVD-RAM drive has begun to spread as a computer peripheral device. Yes.
[0004]
Furthermore, a DVD video standard that realizes a system capable of recording and reproducing information in real time using a DVD-RAM, that is, a standard of RTR (Real Time Recording) -DVD has been developed, and products that comply with this standard are also available. On the market.
[0005]
Conventionally, when handling such a DVD recording medium, recording / playback is performed on the assumption that the structure of the file system is correct.
[0006]
[Problems to be solved by the invention]
However, in the above-described prior art, since recording is performed even on a recording medium having an abnormality in the file system structure, not only recording cannot be performed correctly, but there is a possibility that an already recorded data file may be destroyed.
[0007]
Therefore, the present invention has been made to solve the above-mentioned problem. Before handling a disc, the usable state of the disc is judged, and recording on a recording medium is prohibited according to the status and only reproduction is performed. It is an object of the present invention to provide a recording / reproducing apparatus that permits the recording and preventing the recorded data file from being destroyed.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the recording / playback apparatus of the present invention analyzes the consistency of the file management information of the disk before handling the disk, prohibits recording to a recording medium in which there is an abnormality, and allows only playback. .
[0009]
That is, a recording / playback apparatus according to an embodiment of the present invention includes a detection unit that detects data errors in a plurality of predetermined areas constituting a file system recorded on a recording medium when the recording medium is loaded; Determining means for determining an available state of the recording medium according to a detection result, weight information is set for each of the plurality of predetermined areas, and the determining means is weight information for an area where a data error has occurred. From the value obtained by summing the above, the usable state of the recording medium is determined .
[0010]
The determination means determines whether the recording medium is recordable, only reproducible, or unusable, and the determination result is displayed on the display unit.
[0011]
By adding a new function that determines the status of “recordable”, “only playable”, and “unusable”, recording and playback are permitted when recording is possible, and recording is possible when only playback is possible. Prohibit only playback and prohibit media recording and playback when it is not available, and only allow media reformatting (initialization), so that the file system structure of the recording media is destroyed. Can be prevented.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present embodiment will be described below with reference to the drawings.
[0013]
FIG. 1 is a block diagram showing a configuration of a DVD recording / reproducing apparatus 1 to which the present invention is applied. The recording / playback apparatus rotates a hard disk drive (HDD) 20, a recording medium 2 such as an optical disk capable of constructing a video file, and reads / writes information from / to the recording medium 2, recording The main components are an encoder unit 50 that constitutes the side, a decoder unit 60 that constitutes the reproduction side, and a microcomputer block 30 that controls the operation of the apparatus 1.
[0014]
The encoder unit 50 includes an ADC (analog / digital converter) 52, a V (video) encoder, an A (audio) encoder, an encoder group 53 including an SP (sub-picture) encoder, and an output of each encoder in a predetermined format. The formatter 56 and the buffer memory 57 are provided.
[0015]
The ADC 52 receives an external analog video signal + external analog audio signal from the AV input unit 42 or an analog TV signal + analog audio signal from the TV (television) tuner 44.
[0016]
Under the control of the microcomputer block 30, the data processor 36 supplies the DVD recording data output from the encoder unit 50 to the disk drive 35, fetches the DVD playback signal reproduced from the recording medium 2 from the disk drive 35, Management information recorded on the recording medium 2 is rewritten, or data recorded on the recording medium 2 is deleted.
[0017]
The microcomputer block 30 includes an MPU (microprocessing unit), a ROM in which a control program according to the present invention is written, and a RAM for providing a work area necessary for executing the program.
[0018]
According to the control program stored in the ROM, the MPU of the microcomputer block 30 uses the RAM as a work area, checks the usable state of the recording medium according to the present invention, detects the defect location, detects the unrecorded area, and records information. Recording position setting, UDF recording, AV address setting, etc. are executed.
[0019]
The decoder unit 60 decodes the main video data separated by the separator 62, the separator 62 that separates and extracts each pack from the video information having the pack structure, the memory 63 that is used when performing pack separation and other signal processing, and the like. V decoder, SP decoder for decoding sub-picture data separated by separator 62, decoder group 64 by A decoder for decoding audio data separated by separator 62, SP decoder for main picture data obtained from V decoder The video processor 66 includes a video processor 66 that appropriately synthesizes sub-picture data obtained from the video and outputs a sub-picture such as a menu, subtitles, and the like superimposed on the main video.
[0020]
When the output of the A decoder is digitally output, it is output to the outside via the interface (I / F) 75, and when it is analogly output, it is converted to analog by the DAC 77 via the selector 76 and output to the outside. The selector 76 selects and outputs one of a signal input from the TV tuner 44 and the A / V input unit 42 via the ADC 52 and a signal input from the decoder group 64 according to a select signal from the microcomputer block 30. . The analog audio signal is supplied to an external component (2-channel to 6-channel multi-channel stereo device) (not shown).
[0021]
The key input unit 11 has buttons such as play (PLAY), stop (SOP), recording (REC), skip (Skip), fast forward (FF), reverse feed (Rew), and slow (Slow). By pressing the button, the user can operate the recording / playback apparatus.
[0022]
FIG. 2 shows a directory structure of a real-time recording (RTR) DVD as an example of a DVD disc applied to the recording / reproducing apparatus shown in FIG.
[0023]
In DVD, directories exist for each standard, and these directory names are “DVD_RTAV” in RTR-DVD, “AAUDIO_TS” in DVD-audio, and “VIDEO_TS” in DVD-video. In FIG. 2, “DVD_RTAV” is shown. Recorded data exists in each directory.
[0024]
In the case of a DVD, data is stored in a normal file format. The title corresponds to, for example, one movie, and a plurality of titles can be recorded on one disc. A collection of titles is called a title set (VTS), and this title set is composed of a plurality of files.
[0025]
In the directory “DVD_RTAV”, VR_MANGR.V as a video manager (VMG) file is stored. IFO, VR_MOVIE. As a movie video file. VRO, VR_STILL. As a still picture video file. VRO, VR_AUDIO. As a still picture audio file. VRO, VR_MANAGR. As a backup for video manager. Each file of BUP exists.
[0026]
VR_MANGR. Navigation data is recorded in the IFO file, and this navigation data is data for advancing a program set, a program, an entry point, a playlist, and the like.
[0027]
VR_MOVIE. The VRO file is a so-called movie AV file for recording a movie video object (movie VOB).
[0028]
VR_STILL. VRO is a still picture AV file for recording a still picture VOB. This VR_STILL. VRO is used to record an original VOB composed of a video part including an arbitrary sub-picture unit. At this time, the audio part related to the video part is also included in the original VOB.
[0029]
VR_AUDIO. VRO is a still picture additional audio file for recording an additional audio stream for the still picture. This additional audio part indicates an audio stream recorded by after recording. VR_AUDIO. The audio part recorded in VRO is VR_STILL. Used in combination with several video parts recorded on VRO.
[0030]
FIG. 3 shows VR_MOVIE. As the movie video file. VR_STILL. As a VRO and still picture video file. The file structure of VRO is shown.
[0031]
A video file has a hierarchical structure, one file is composed of a plurality of VOBs (video objects), one VOB is composed of a plurality of VOBUs (video object units), and one VOBU is composed of a plurality of packs. As the plurality of packs, there are an RDI pack, a V pack, an A pack, and the like.
[0032]
The V pack is a video data compressed by the MPEG2 system, and is composed of a pack header, a packet header, and a video data portion. The A pack is obtained by processing audio data by a method such as linear PCM, MPEG, or AC3, and includes a pack header, a packet header, and an audio data portion.
[0033]
In the pack, time stamps such as PTS (Presentation Time Stamp) indicating reproduction time and DTS (Decoding Time Stamp) indicating decoding time are described as appropriate. For the sub-picture PTS, a time arbitrarily delayed from the PTS of the main picture data or audio data in the same reproduction time zone can be described.
[0034]
The order of reproducing data recorded in the video file is defined by a program chain (PGC). A cell (Cell) is defined in the program chain (PGC), and a VOB to be reproduced is defined in the cell. The part where the specific information of this PGC is recorded is the program chain information (PGCI) part in the VMG file. There are two types of PGCI, one is an original PGCI (ORG_PGCI) and the other is a user-defined PGC table (UD_PGCIT).
[0035]
Here, the configuration of the video manager file (VMG) in which the program chain information is described will be described.
[0036]
FIG. 4 shows information described in the VMG file in a hierarchical manner, and particularly shows program chain information (PGCI) in detail in a hierarchical manner.
[0037]
In the VMG file, RTR_VMGI (RTR video manager information), M_AVFIT (movie AV file information table), S_AVFIT (still picture AV file information table), ORG_PGCI (original program chain information), UD_PGCIT (user-defined program chain information), There are TXTDT_MG (text data manager) and MNFIT (manufacturer information table).
[0038]
RTR_VMGI (RTR video manager information) includes a video manager information management table (VMGI_MAT) and a playlist search pointer table (PL_SRPT).
[0039]
The playlist search pointer table indicates link information necessary for searching and accessing a playlist in the RTR disc. PL_SRPT starts with PL_SRPT information (PL_SRPTI), followed by a playlist search pointer (PL_SRPs). Each playlist consists of user-defined PGCs. Therefore, PL_SRP has a PGC number corresponding to the playlist. The playlist is distinguished by a unique number related to the playlist, that is, a playlist number (PLN). This PLN is assigned to all playlists in the order from PL_SRP “1” to “99” in PL_SRPT. The user can distinguish one playlist from its PLN. The playlist number is the same as the user-defined PGC number.
[0040]
ORG_PGCI (original program chain information) is a special PGC for reproducing data in the recording order. That is, the original PGC is information that specifies the data reproduction order, and indicates a program set (PG_SET) that is a connection of programs (PG). Here, the program is a logical unit of recorded contents defined by the user, and one program in the program set includes one or more original cells. This program set is data stored in the VRO file. The numbers assigned to each program in the original program chain are called program numbers (PGN), and these numbers are from “1” to “99”. A program number (PGC) defined by the user is assigned a serial number called a program number (PGCN). “0” is added to the original program chain as a special PGCN.
[0041]
UD_PGCIT (user-defined program chain information) is also link information that specifies the data reproduction order. However, a part of the program specified by the ORG_PGCI is specified by editing the program by the user, and the portion is changed. Connected. Therefore, UD_PGCIT indicates a cell connection, not a group connection of programs. A cell is information indicating each part of a program. The cells in the program chain are assigned consecutive numbers, and these numbers are called cell numbers (CN).
[0042]
ORG_PGCI (original program chain information) and UD_PGCIT (user-defined program chain information) have the same data structure in content.
[0043]
The PGCI includes PGC general information (PGC_GI), a PGC information table (PGCIT), a cell information search pointer (CI_SRPT), and a cell information table (CIT).
[0044]
In the PGC general information (PGC_GI), the number of programs and the number of cell search pointers in the PGC are described.
[0045]
In the PGC information table (PGCIT), program information (PGI) is described. The program type (PG_TY) indicating whether the program is in an erase-protected state, the number of cells in the program (C_Ns) ), Primary text information (PRM_TEXTI) indicating a character set, item text search pointer number (IT_TXT_SRPN) corresponding to this program, cell number, and representative image information (REP_PICTI) indicating a picture point.
[0046]
The cell information search pointer (CI_SRPT) describes the start address of the cell information (CI). In the cell information table CIT, cell information (CI # 1 to CI # j) specified by the search pointer is described. Cell information (CI) describes cell general information (C_GI) and cell entry point information (C_EPI # 1 to C_EPI # k).
[0047]
Next, a DVD recording / reproducing system using the recording / reproducing apparatus 1 of FIG. 1 will be described. FIG. 5 is a diagram showing the configuration of a DVD recording / playback system. As shown in FIG. 5A, the DVD recording / reproducing system includes the DVD recording / reproducing apparatus 1, the recording medium 2, and the display 3 shown in FIG.
[0048]
The file system inspection method of the present invention will be described in detail below. FIG. 6 is a flowchart showing this inspection method.
[0049]
As shown in FIG. 5B, the DVD recording / reproducing apparatus 1 is connected to the display 3 via the cable 4, and the recording medium 2 is inserted into the DVD recording / reproducing apparatus 1. At this time, the recording medium 2 is loaded, and the structure of the file system is analyzed by a program inside the DVD recording / reproducing apparatus (S101).
[0050]
The degree of abnormality is calculated from the presence / absence of abnormality obtained by this analysis, the location of the abnormality, and the sum of weight information for each location as shown in FIG. 7A prepared in advance (S102). For example, a weight “10” is set in the checksum of the CRC (Cyclic Redundancy Check) of the PVD (Primary Volume Descriptor). That is, when the PVD CRC result is NG, 10 is added as the degree of abnormality. A weight “5” is set for the LB (Logical Brock) size of the LVD (Logical Volume Descriptor). That is, if the LB size of the LVD is not 2048 bytes, 5 is added as the degree of abnormality. In this way, a data error in a predetermined area constituting the file system recorded on the recording medium 2 is detected.
[0051]
Based on the degree of abnormality thus obtained, a message for each degree of abnormality is displayed on the display 3 as required (S103) as shown in FIG. Further, the functions that can be used in the DVD recording / reproducing apparatus 1 are restricted as shown in FIG. 7B, and the restriction contents are displayed on the display 3 (S104). As a result, it is possible to inform the user of the degree of abnormality and prompt an appropriate response, and to prevent the destruction of the recording medium 2 by an inadvertent operation.
[0052]
Next, a second embodiment of the present invention will be described. FIG. 8 is a flowchart showing the operation of the second embodiment.
[0053]
First, the recording medium 2 is loaded in the DVD recording / reproducing apparatus 1 (S201), and it is determined whether or not the file structure can be traced (S202). “Trace is possible” means that a target directory or a file of recorded data can be searched by following the link of the file system management information as shown in FIG. 2 or FIG. On the other hand, tracing is impossible when there is a failure in the link information on the way, and the target directory or file cannot be found.
[0054]
If the trace is impossible, the recording medium 2 is determined not to be recordable and reproducible because the target directory or file cannot be written or read. Accordingly, as in step S203, only the format is permitted, and the content “only format is possible” is displayed on the display 3 as necessary.
[0055]
If tracing is possible, it is determined whether the recording management table is normal as in step S204. The recording management table is a table for distinguishing a recorded location and an unrecorded location on the recording medium 2. FIG. 9 shows the relationship between the file management information and the record management table as shown in FIG. By using this recording management table, it is possible to check whether or not recording has been performed in units of sectors / blocks, and to secure a new recording location so as not to destroy existing content information.
[0056]
In the content information, the recording location (sector / block) is managed by the file management information. Therefore, the contents of the recording medium 2 can be protected by comparing the recording management table with the file management information and checking the consistency.
[0057]
When the recording management table is not normal (that is, when there is a contradiction between the recording management table and the file management information), recording of the recording medium 2 is prohibited from the viewpoint of protection of the recording medium 2, and the content “ “Allow only reproduction” is displayed on the display 3. If only reproduction is permitted, the file system management information and contents are not changed, and the recording medium 2 is not further destroyed.
[0058]
If there is no problem in the determinations in steps S202 and S204, recording on the medium is permitted (S206). By performing the above processing, the effect of protecting the recording medium can be expected.
[0059]
Next, a third embodiment of the present invention will be described. FIG. 10 is a flowchart showing the operation of the third embodiment.
[0060]
First, the recording medium 2 is loaded in the DVD recording / reproducing apparatus 1 (S301), and then it is determined whether there is any illegality in the file system (S302). Here, “invalid” means that there is a violation of the file system standard of the recording medium. This violation includes a CRC checksum error, an LB size error, and the like shown in FIG.
[0061]
If the file system is correct, recording on the medium is permitted as in step S306. If the file system has a fraud, it is determined whether the fraud is a minor fraud as in step S303. "Minor fraud" here means that the existing file system information or contents cannot be destroyed by appending, and the found illegal contents can be corrected using other management information values. Say.
[0062]
If the fraud is minor, the fraudulent portion of the recording medium 2 is corrected, that is, the recording medium is rewritten to a medium without fraud (S304), and recording is permitted (S306). If it is determined in step 303 that the fraud is not mild, there is a possibility that the existing file system structure or content is destroyed by appending the content. Accordingly, writing (recording) to the recording medium is prohibited, and the content “only reproduction” is displayed on the display 3 as necessary. If there is such a minor fraud, correcting the fraud increases the possibility that compatibility with a system using the same file system standard can be achieved.
[0063]
【The invention's effect】
As described above, according to the present invention, the usable state of the disc is determined, recording on the recording medium is prohibited and only reproduction is permitted in accordance with the state, and the recorded data file is destroyed. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a DVD recording / reproducing apparatus 1 to which the present invention is applied.
FIG. 2 is a diagram showing a directory structure of video and audio files of a real-time recording DVD.
FIG. 3 shows VR_MOVIE. As a movie video file. VR_STILL. As a VRO and still picture video file. The figure which shows the file structure of VRO.
FIG. 4 is a diagram showing details of program chain information in a hierarchical manner.
FIG. 5 is a diagram showing a configuration of a DVD recording / reproducing system.
FIG. 6 is a flowchart showing an inspection method according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating an example of weighting by a recording area.
FIG. 8 is a flowchart showing the operation of the second embodiment.
FIG. 9 is a diagram showing a relationship between file management information and a record management table.
FIG. 10 is a flowchart showing the operation of the third embodiment.

Claims (5)

  1. Detecting means for detecting data errors in a plurality of predetermined areas constituting the file system recorded on the medium when loading the recording medium;
    According to the detection result of the detection means, comprising a determination means for determining the usable state of the recording medium ,
    Weight information is set for each of the plurality of predetermined areas, and the determination means determines the usable state of the recording medium from a value obtained by summing weight information of areas where data errors have occurred. .
  2.   2. The recording / reproducing apparatus according to claim 1, wherein the determination unit determines whether the recording medium is recordable, only reproducible, or unusable.
  3. The determining means, the data errors detected by the detecting means determines whether the minor errors, according to claim 1, characterized in that have a means for repairing the data error in the case of minor errors Recording / playback device.
  4. 3. The recording / reproducing apparatus according to claim 1, further comprising display means for displaying a judgment result of the judgment means .
  5. Detecting a data error in a plurality of predetermined areas constituting a file system recorded on the recording medium when loading the recording medium;
      Determining the usable state of the recording medium according to the detection result of the detection step,
    Weight information is set for each of the plurality of predetermined areas, and the determining step determines the usable state of the recording medium from a sum of weight information of areas where data errors have occurred. Inspection methods.
JP2001375918A 2001-12-10 2001-12-10 Recording / reproducing apparatus and recording medium inspection method Expired - Fee Related JP3692068B2 (en)

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Publication number Priority date Publication date Assignee Title
JP3998611B2 (en) 2003-08-12 2007-10-31 富士通テン株式会社 Recording medium playback device
DE60318212T8 (en) 2003-10-31 2009-04-02 Sony Dadc Austria Ag Dvd copy protection
JP2006066043A (en) 2004-08-30 2006-03-09 Orion Denki Kk Recording device or recording and reproducing apparatus or electronic apparatus provided with the same capable of restricting viewing by title; recording medium capable of restricting viewing by title; reproducing apparatus or recording and reproducing apparatus or electronic apparatus provided with the same capable of restricting viewing by title; method for setting password by title; method for permitting operation by title; program for setting password by title; and control program for permitting operation by title
JP2008103010A (en) * 2006-10-18 2008-05-01 Sanyo Electric Co Ltd Optical disk device
JP5008461B2 (en) * 2007-05-31 2012-08-22 アルパイン株式会社 Fault information storage device and fault information storage method
KR20090058146A (en) * 2007-12-04 2009-06-09 한국전자통신연구원 Forgery-proof digital sound recording device
JP4762269B2 (en) * 2008-06-06 2011-08-31 パナソニック株式会社 Reproducing apparatus, integrated circuit, and reproducing method
JP2011081889A (en) * 2009-10-09 2011-04-21 Toshiba Tec Corp Storage device, information processing device, and storage control program

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