JP4830773B2 - Data processing apparatus, method, and program - Google Patents

Description

  The present invention relates to a recording technique and a recording method when data is recorded on a medium (that is, a recording medium) in a format of UDF 2.5 or later.

  In recent years, with the widespread use of DVD recorders adopting the DVD video recording standard, it has become widespread to record broadcast programs in the UDF 2.0 format on DVD discs or to record content shot with camcorders.

  On the other hand, a new format for recording content photographed by a camcorder on the UDF2.5 format (see Non-Patent Document 1) is being developed and sold.

FIG. 6 shows the data arrangement of an optical disc formatted in UDF2.5. Various data constituting the file system are recorded on the innermost circumference side (the side with the smallest LSN value) and the outermost circumference side (the side with the largest LSN value) of the optical disc.
Optical Storage Technology Association (OSTA) Universal Disk Format Specification Revision 2.50

  When a DVD disc with contents recorded in the UDF 2.5 format is inserted into a conventional DVD recorder, the DVD recorder detects the UDF version, and if it detects that it is not UDF 2.0, the user is reformatted to UDF 2.0. There was a case of prompting. That is, guidance to reformatting (initialization) to the UDF2.0 format is performed. When a user who does not understand the meaning of “format” performs reformatting according to this guidance, there is a problem that content recorded on the disc is erased against the user's intention.

  FIG. 6 shows an area that is initialized when reformatted by UDF2.0. By this processing, as shown in FIG. 6, most data constituting the UDF2.5 format is rewritten, and the recorded content cannot be restored.

  An object of the present invention is to make it possible to reliably and easily restore erased content even when a user reformats a disc by mistake according to a format guide.

A data processing apparatus according to the present invention includes a writing unit for recording a data file on a disk in the UDF format,
The writing unit records, within a predetermined area, file system information capable of recording a recording address at an arbitrary address among file system information constituting the UDF format,
Record the data address in the predetermined area,
UDF version is 2.5 or higher,
The predetermined area excludes the innermost and outermost predetermined areas of the disk, does not include the innermost AVDP (anchor volume descriptor pointer), and includes the outermost AVDP. It is characterized by not.

  This configuration inserts a disc recorded in UDF 2.5 into a conventional DVD recorder or the like that handles only UDF 2.0, and reformats the disc in accordance with the format guidance message output by the DVD recorder. Even if it is deleted, the content can be restored reliably and easily.

According to the present invention, even if a disc having contents recorded on UDF 2.5 is inserted into a conventional DVD recorder and erroneously formatted to UDF 2.0, the contents once erased can be reliably and easily restored. It becomes possible. This means
For example, this is particularly effective when content that cannot be photographed by a camcorder is erased by mistake.

  Hereinafter, embodiments of a data processing apparatus according to the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 shows a data processing apparatus according to the first embodiment. During moving image recording, signals input from the video signal input unit 100 and the audio signal input unit 102 are respectively compressed by the video compression unit 101 and the audio compression unit 103 under the control of the recording control unit 161, and transported by the system encoding unit 104. A stream is created and written to the optical disc 140 via the recording unit 120 and the pickup 141.

  The recording control unit 161 activates the continuous data area detection unit 160 to search for an empty area before recording of the transport dream is started. The continuous data area detection unit 160 searches for a continuous free area using a space bitmap read out from the optical disk in advance. Then, recording of the transport stream is started on the empty area detected as a result of the search. Then, until the transport stream is filled with the detected free area, the next free area is continuously searched for and the transport stream recording is continued. When the writing of the transport stream is completed, the file management information of UDF version 2.5 is written, and the writing of the transport stream file (* .m2ts file, that is, the file storing the moving image stream) is completed. Next, a stream management data file (* .clpi) corresponding to the recorded transport stream is recorded. Next, the recorded transport stream and a playlist file (* .mpls) corresponding to 1: 1 are recorded. Furthermore, a thumbnail management file (menu.tidx) and a thumbnail data management file (menu.tdat) relating to the corresponding thumbnail image are recorded. The playlist file specifies a specific reproduction range in the transport stream file. In this embodiment, it is assumed that the playback range is from the beginning to the end of the transport stream.

  Further, at the time of reproduction, when the user selects content to be reproduced, the management of the data stream corresponding to the content is read from the management file via the reproduction unit 121 under the control of the reproduction control unit 162, and the management file The transport stream is further read out by referring to the address information described in (1). The transport stream is separated into a video signal and an audio signal by the system decoding unit 114 and output to the video display unit 110 and the audio output unit 112 via the video expansion unit 111 and the audio expansion unit 113, respectively.

  Also, the edit control unit 164 activates the recording unit 120 and the playback unit 121 to instruct transport stream and transport stream management data when the user instructs partial deletion of the recorded content. The editing process is controlled by reading or writing after correction. Further, when the user instructs to delete the recorded content, the corresponding transport stream, stream management data file, playlist file, and corresponding thumbnail image are deleted. Furthermore, the index file in which the playlist file to be executed is registered is also corrected.

  In addition, the menu recording unit 165 has a title Menu. When it is confirmed that the jar file is not recorded when the power is turned on or when the optical disk is inserted, a Java (registered trademark) program pre-recorded in the built-in ROM (not shown) of the AV data processing apparatus is stored in the optical disk. Record above.

  The Java (registered trademark) program is a compiled code, and is stored in the titleMenu. stored in a jar file.

  FIG. 2 shows a file structure on the optical disc according to the first embodiment. A BDMV directory is created under the ROOT directory, and various files are recorded under the BDMV directory. index. In the bdmv file, a Java (registered trademark) program name for displaying a title menu and a recorded playlist file name are recorded. A Java (registered trademark) program (titleMenu.jar), a thumbnail management file (menu.tidx), and a thumbnail data file (menu.tdat) for displaying a title menu are recorded under the Menu directory. In the thumbnail data file, a representative still image (thumbnail) is stored in JPEG code format for each moving picture stream. The thumbnail management file stores information on the correspondence between the moving image stream and the representative still image (the moving image stream file name and the recording destination address in the thumbnail data file of the representative still image). The Java (registered trademark) program for displaying the title menu draws the title menu using the representative still image in the thumbnail data file, and starts playback of the video stream selected by the user. Thereafter, the drawing of the title menu, the reproduction of a different video stream, and the like are performed again according to the description of the Java (registered trademark) program.

  A playlist file (* .mpls) is stored 1: 1 in the PLAYLIST directory corresponding to the moving image stream. The STREAM directory stores a moving image stream (* .m2ts). A management data file (* .clip) corresponding to a moving image stream is stored in the CLIPINF directory. Stored in video stream and transport stream code formats.

  It is assumed that the optical disk is formatted with the UDF file system. At this time, it is assumed that a logical block which is a management unit of a free area and an allocation unit of an area is 2 kbytes.

  FIG. 3 shows an outline of the area used in the optical disc in the first embodiment. Content is recorded on the UDF2.5 file system with the file structure shown in FIG. At this time, content and file system information is recorded between LSN (logical sector number) = 512 and N-288 (where N is the final LSN). However, among file system information, AVDP (anchor volume descriptor pointer) is an exception because the recording destination addresses are determined to be recorded at three locations of LSN = 256, N-256, and N. Similarly, VRS (volume recognition sequence) where the recording destination LSN is determined is also an exception. In the first embodiment, when the optical disc is reformatted with UDF 2.0 by the conventional DVD recorder, the areas from LSN = 0 to 512 and the areas from LSN = N-288 to N are all erased and UDF2 File system information bearing .0 is recorded.

  FIG. 4 shows the recording position of the file system information in more detail. VRS, 1stAVDP, 2ndAVDP, and 3rdAVDP whose recording destination addresses are predetermined are recorded in LSN = 16, 256, N-256, and N sectors, respectively. MainVDS (Main Volume Descriptor Sequence), LVIS (Logical Volume Integrity Sequence), MD Bitmap (Metadata Bitmap) FE (File Entry) and its Contents, MD File (Metadata File) FE ( File entry) and its contents are recorded immediately after LSN = 512. Further, the FE of MD Mirror File (metadata mirror file), its contents, and Reserved VDS (Reserved Volume Descriptor Sequence) are recorded with LSN = N-1536 and N-512 as the heads, respectively. Then, the contents of the file of FIG. 2 are recorded in the user area of FIG.

  With the above configuration, when an optical disc recorded in the UDF 2.5 file format shown in FIGS. 3 and 4 is set in a conventional DVD recorder and is formatted (initialized) to UDF 2.0 by mistake. Even so, only three AVDPs and VRSs are erased. Thus, when restoring the content recorded in the UDF2.5 format on the optical disc, it is only necessary to rewrite the three AVDPs and VRSs. Next, check to make sure that there is no conflict at the file system level. With the above procedure, the content can be restored easily and reliably.

  The AVDP stores the recording destination LSN of MainVDS and the recording destination address of ReservedVDS. In FIGS. 3 and 4, it is only necessary to record the values of 512 and N-256, respectively. A value defined in the standard may be recorded in the VRS.

  Note that an address of LSN = N means an address where the end of file system information is physically recorded. For example, if the data size shown in FIG. 3 or FIG. It becomes GMByte. For example, in a DVD-R / -RW disc, in order to maintain high playback compatibility with a disc drive, it is necessary to satisfy N> about 1 GByte even when the content is small.

(Embodiment 2)
The difference from Embodiment 1 is that the arrangement of information defined by the file system on the optical disc is different. The other points are the same as those in the first embodiment.

  FIG. 5 shows a state immediately after the optical disc in the second embodiment is formatted with UDF2.5. The difference from FIG. 4 is that MainVDS and LVIS are recorded before LSN = 512. Next, the Reserved VDS is recorded immediately after AVDP recorded in LSN = N-256.

  With the above configuration, when reformatted (initialized) with UDF 2.0 by a conventional DVD recorder, the contents of the MD File can be analyzed and the recorded files and directories can be restored. This is because the name of each file and the data storage destination of each file are stored in the MD File. In this case, it is possible to restore the content without using the information recorded before LSN = 512 and the information recorded after LSN = N-256. MainVDS and LIVS may be created and recorded in accordance with the UDF2.5 format.

  In the second embodiment, both MainVDS and LVIS are recorded before LSN = 512, but only one side may be recorded.

  In the second embodiment, the Reserved VDS is recorded on the outer peripheral side with respect to LSN = N-256.

  In the second embodiment, data such as VDS constituting various file systems is recorded in an area excluding the outermost and innermost areas. However, the MD File or MD Mirror File Either may be recorded between LSN = 512 and N-1536. However, in this case, detailed analysis such as tracking of the ICB chain configured in the MD File or MD Mirror File is required.

  In this embodiment, the restoration method when a disk recorded in the UDF 2.5 format is erroneously erased in UDF 2.0 has been described. However, a disk recorded in the UDF 2.6 format is erroneous in UDF 2.0. The same applies to the case of erasing. The same applies to the case of erroneous erasure by formatting to UDF1.02 or the like.

  Note that the thumbnail data file and the thumbnail management file are titleMenu. The jar file is provided independently of titleMenu. It may be included in the jar file. The same applies to the case of recording individual thumbnail data files for each moving picture stream.

  In the embodiment, the medium for storing the data stream or the like is a removable optical disk. However, it is not necessary to be a removable medium, and a non-removable medium such as an HDD built in the AV data processing apparatus. There may be. However, in this case, the AV data processing apparatus is connected to the network, and a Java (registered trademark) program for drawing the title menu is referred to and executed by another AV data processing apparatus.

  In the embodiments, the storage medium is an optical disk. However, the present invention is not particularly limited to this, and may be a semiconductor memory such as a memory card, flash memory, FeRAM, or MRAM. The optical disk may be an optical disk or hard disk such as DVD-RAM, MO, DVD-R, DVD-RW, DVD + RW, DVD + R, CD-R, CD-RW, BD-RE, BD-R, HD-DVD, etc. good.

  Although the UDF file system has been described in the embodiment, different file systems may be used as long as the configuration is similar.

  1 and the like are typically realized as a chip of an integrated circuit (Large Scale Integrated Circuit; LSI). These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. For example, in FIG. 1, the MPEG encoder 170 and the system control unit 180 are shown as separate functional blocks. These may be mounted as separate semiconductor chips, or may be realized by physically the same chip. Further, the functions of the system control unit 180, the MPEG encoder 170, and the MPEG decoder 171 may be integrated and realized as one chip circuit. However, for example, only a memory that stores data to be encoded or decoded may be excluded from integration targets.

  The system control unit 180 can implement the functions described in the present specification by executing a computer program stored in a program ROM or the like.

  The above-mentioned “LSI” may be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration. The method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

  Furthermore, if integrated circuit technology that replaces LSI appears as a result of progress in semiconductor technology or other derived technology, functional blocks may be integrated using this technology. For example, integration may be performed as a so-called bioelement using biotechnology.

  In the embodiment, the data stream is assumed to be a transport stream to which an arrival time stamp (Arrival Time Stamp) is added for each transport packet. However, a program stream, a PES stream, a QuickTime stream, an MP4 stream, an AVI stream, and an ASF are used. Other bit streams such as a stream and a Motion JPEG stream may be used.

  In the embodiment, the video is an MPEG-2 video stream as an example, but may be an MPEG-4 video stream or an MPEG-4 AVC (H.264) stream. The audio may also be a linear PCM audio stream, an AC-3 stream, or the like. Further, multimedia information other than video and audio (graphics information, character information, etc.) may be included.

  In the embodiment, one transport stream can be stored in one data stream file. However, a plurality of transport streams may be configured as one data stream file.

  In the embodiment, the Java (registered trademark) program for drawing the title menu is recorded when the optical disc is inserted, but may be the time when the formatting of the optical disc is completed. Further, it may be a time point specified by a user operation.

  In the embodiment, a movie for recording a video stream and a Java (registered trademark) program for displaying a title menu on a recorder are recorded. However, it is different from an AV data processing apparatus that records a video stream on an optical disc. AV data processing apparatus (recorder, camcorder, personal computer, etc.) may record only the title menu.

  In the embodiment, the video compression code of the moving picture stream is not particularly limited as long as it can be reproduced by the player, such as MPEG-2 video, MPEG-4 AVC, MPEG-4 visual, VC-1, or the like.

  In the embodiment, it is assumed that the player can always reproduce a class library conforming to the BD-ROM standard, and the Java (registered trademark) program uses a class defined by the BD-ROM standard. Can be used, a GUI library such as Swing implemented on a personal computer can be used. Further, a class library capable of Internet access, such as included in the BD-ROM standard, may be used separately.

  In the embodiment, the Java (registered trademark) program is reproduced by the player, but may be a personal computer.

  In the embodiment, the format processing in UDF 2.0 is performed by another data processing device, but may be performed by the same data processing device.

  The data processing apparatus, method, and program according to the present invention initialize the UDF2.5 format so that the innermost and outermost sides of the disk are previously opened. As a result, even if the UDF 2.0 is initialized by a conventional DVD 2.0-based DVD recorder, it is possible to easily and surely restore the content. For example, a camcorder, a recorder, and a PC for recording content with UDF 2.5 This is useful as an image editing software or the like.

The block diagram which shows the structure of the data processor in embodiment of this invention The figure which shows the file structure on the optical disk in embodiment of this invention The figure which shows the outline of the layout of the data of the disk in 1st Embodiment The figure which shows the detail of the layout of the data of the disk in 1st Embodiment The figure which shows the outline of the layout of the data of the disk in 2nd Embodiment The figure which shows the outline of the data layout of the disk in conventional embodiment

Explanation of symbols

100 video signal input unit 101 video compression unit 102 audio signal input unit 103 audio compression unit 104 system encoding unit 110 video display unit 111 video expansion unit 112 audio output unit 113 audio expansion unit 114 system decoding unit 120 recording unit 121 playback unit 140 removal Possible Optical Disc 141 Pickup 160 Continuous Data Area Detection Unit 161 Recording Control Unit 162 Playback Control Unit 163 Logical Block Management Unit 164 Editing Control Unit 165 Menu Recording Unit 170 MPEG Encoder 171 MPEG Decoder 180 System Control Unit 200 Data Processing Device

Claims (6)

A writing unit for recording a data file on a disc in a predetermined version of UDF format;
The writing unit changes the metadata file including the data storage destination of the data file in the data file and the file system information constituting the UDF format by the UDF format process of the version before the predetermined version. Record in the area excluding the specified area,
The data processing apparatus according to claim 1, wherein the predetermined version is UDF 2.5 or higher. The writing unit records file system information that can be recorded at an arbitrary address among file system information constituting the UDF format in an area excluding the predetermined area,
A data processing apparatus, wherein file system information including a data storage destination related to file system information recordable at the arbitrary address is recorded in the predetermined area.   3. The data processing apparatus according to claim 1, wherein the predetermined area is an area that is initialized when the predetermined area is formatted in the UDF format version 2.0. A writing step of recording the data file on a disc in a predetermined version of UDF format;
In the writing step, a metadata file including a data storage destination of the data file in the data file and file system information constituting the UDF format is changed by the UDF format process of the version before the predetermined version. Record in the area excluding the specified area,
The data processing method according to claim 1, wherein the predetermined version is UDF 2.5 or more. A writing unit for recording a data file on a disc in a predetermined version of UDF format;
The writing unit changes a metadata file including a data storage destination of the data file in the data file and file system information constituting the UDF format by a UDF format process of a version before the predetermined version. Record in the area excluding the specified area,
A data processing LSI, wherein the predetermined version is UDF 2.5 or higher.   A program for causing a computer to execute the data processing method according to claim 4.