JP2005353136A - Video/audio data recording method, device, program and medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording method capable of writing once video/audio data with respect to Write At Once media such as a DVD-R, and to provide a device, a program and a medium therefor. <P>SOLUTION: When the file control information is recorded, the recording is carried out in reverse order of directory hierarchies from a ROOT directory to a file of a directory hierarchical terminal. Thus, the writable once recording method having high rigidity against error on the Write At Once media is realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording method, apparatus, program, and medium capable of additionally recording video / audio data to a Write At Once medium such as a DVD-R.

  In general, a Write At Once medium such as a DVD-R is recorded using a format such as FAT (File Allocation Table) or UDF (Universal Disk Format). In the FAT system, file management information called DR (Directory Record) is used, and in UDF, file management information called FID (File Identifier Descriptor) and FE (File Entry) is used, and all file and directory data on the media are converted into ROOT. It is a mechanism that can be searched from the directory (for example, see Patent Document 1).

The video / audio recording / reproducing apparatus searches the file management information of the file to be reproduced, the file to be recorded, and the file management information of its parent directory from the ROOT directory file management information (see, for example, Non-Patent Document 1). .
JP 2002-373099 A DVD Specifications for Recordable Disc for General (DVD-R for General) Part2 File System SPECIFICATIONS Version 2.0 September 2000

In such a conventional method,
1) Since the data of the UDF Volume layer and the data of the file management information group are recorded by the finalizing process, it takes time for the finalizing process.
2) File management information is recorded from the ROOT directory, and a file having the file management information of the directory or the file immediately under the directory is written in the file management information of the directory. If a media recording error occurs when recording file management information for a file, the file management information in the parent directory of the file with the error indicates that the sector containing the file management information for the file with the recording error is written. Become. For this reason, error recovery processing at the time of recording is impossible and reproduction is impossible. In particular, DVD-R media have poor quality media, and such obstacles frequently occur.
3) When recording on a Write At Once medium such as a DVD-R, if it is difficult to record the audio / video data in the DVD-Video format and the DVD Video Recording format on the medium, there is a means for prohibiting the mixing of the data. There wasn't.

  The present invention has the following main features. In order to shorten the finalization time, information that does not depend on the data recorded on the medium is processed in a waiting time for processing such as waiting for reserved recording.

  In addition, when recording file management information, a mechanism is adopted in which the information in the parent directory can be corrected by recording from the end of the directory structure and rewriting to another area when a recording error occurs.

  Further, whether the recorded video / audio data is DVD-Video recording or DVD-Video Recording recording is discriminated by intermediate data.

  The recording method of the present invention has the advantage that the finalization time can be shortened and the robustness against occurrence of a recording error can be improved when recording video / audio data on a Write At Once media by a video / audio recording / playback apparatus such as a DVD recorder. . Further, it is possible to identify whether the video / audio data recorded on the Write At Once medium is DVD-Video recording or DVD-VideoRecording recording, and to prevent the DVD-Video recording data and the DVD-VideoRecording recording data from being mixed.

  Examples of the invention are described below.

(Embodiment 1)
The video / audio apparatus according to the present invention is an apparatus for recording digital data, and a schematic diagram is shown in FIG. Encoder 2 for generating video / audio data, recording buffer 3 for temporarily storing video / audio data generated from encoder 2, drive 1 for recording video / audio data using portable media, video / audio The hardware configuration includes a decoder unit 4 for reproducing data and a reproduction buffer 5 for temporarily storing video / audio data to be reproduced. The drive 1 is connected to the recording buffer 3 and the reproduction buffer 5 via the data bus 7, and the recording / playback control unit 6 controls these hardware.

  Next, the present embodiment will be described with reference to FIG. FIG. 2 is a diagram showing a data format when data is recorded on the DVD-R. When the medium loaded in the drive 1 is Write At Once, an operation of finalizing is required at the end of recording. For example, when recording on the media based on the UDF standard, the media is divided into a plurality of zones such as a first zone and a second zone, video and audio data is recorded in the second zone, and the final zone is recorded in the first zone. Records UDF standard Volume layer data and file management information. When the recording of the video / audio data is finished and finalization is performed, the file management information group is recorded on the medium after the UDF Volume layer data is written. The file management information group includes descriptors such as a File Set Descriptor (FSD), a Terminator Descriptor (TD), a File Entry (FE), and a File Identifier Descriptor (FID) defined by the UDF standard.

  FE indicates the position of the actual data of the file or directory, and FID describes the name of the file or directory and the position information of the FE. However, in order to search for a specific file by looking at a certain medium, the FID (first FID) of the file or directory immediately under the ROOT directory in the actual data indicated by the FE (first FE) of the ROOT directory is recognized. Further, it is performed by recognizing the second FE indicated by the first FID. The UDF Volume layer stores FSD position information, first FE position information, and information such as the number of files and directories on the medium. Normally, a new file is added to the file on the media, so it is not known until just before finalization. However, when the directory structure is determined by a specific standard or the like and the number of files is fixed, it is possible to write the data of the UDF Volume layer in advance.

  Further, when the file name of the video / audio data is fixed, a sector for recording the FE of the video / audio data is determined in advance. FIG. 3 is a diagram showing the data arrangement of the file management information group recorded in advance according to the first embodiment of the present invention. Thus, in addition to the UDF Volume layer data, the file management information group data can be recorded in advance up to the FID of the video / audio data as shown in FIG.

  The data to be recorded in advance is performed at a time when the video / audio data is not recorded or reproduced on the medium. An example of the procedure is shown below.

When loading the media, check if the data to be recorded is recorded in advance. At this time, if not recorded,
1. When performing scheduled recording, a recording time is secured in advance before the scheduled recording is started, and recording is performed during this standby.
2. When dubbing from other media, record at the start of dubbing.

  In order to perform playback or the like with other devices, finalization of the media is required. However, the data to be recorded at the time of finalization is recorded in advance, so that the time for finalizing the media can be shortened.

  Next, a description will be given of the finalizing process of the media when the recorded data is modified by additional writing or the like. FIG. 5 is a diagram showing the positional relationship between file data and intermediate data when data is newly recorded or when recorded data is modified by appending or the like. The intermediate data is composed of Fe or Fe and Fid of the file or directory to be recorded, and its size is determined in advance by the number of files or directories to be recorded.

  First, an example in which the recording file or directory Fe is used as intermediate data will be described. The video / audio data is recorded in the second zone shown in FIG. After the recording of the video / audio data is stopped, the intermediate data is continuously recorded. The intermediate data consists of Fe of File1 to File3, and each Fe indicates added data and previously recorded data as entities. When a part of the data is deleted instead of appending, the entity indicated by Fe is recorded in a form excluding the deleted data.

  As a result, the latest intermediate data is always written at the end of the medium after the recording is completed, and by acquiring this latest intermediate data, the recording position of the Fe of the file or directory currently existing on the medium Information can be acquired, and a recordable recording method can be realized.

  In this description, the intermediate data is Fe, but original data indicating addresses where entities from File 1 to File 3 exist may be used. Furthermore, although the case where the number of files is three has been described, there may be other numbers.

  Next, processing for finalizing media will be described. In the case where the intermediate data is composed of Fe of files and directories to be recorded, the Fe data is copied to a predetermined area shown in FIG. In the case where the intermediate data is composed of Fe and Fid of files and directories to be recorded, the data to be recorded in advance in FIG.

  When the intermediate data is original data indicating addresses where entities from File 1 to File 3 exist, Fe data is created from the original data, and each Fe is recorded in a predetermined area shown in FIG. File management information. The combination of the file management information group and the first file management information is performed by recording the second file management information including the FIDs of File1 to File3.

  As described above, the processing time can be shortened compared with the finalizing process recorded from the UDF Volume layer in the prior art.

(Embodiment 2)
FIG. 4 is a diagram showing a method of recording a file management information group that is highly robust against recording errors. Since the Write At Once media can be recorded only in one direction, a sector for recording the Root Dir FE is determined in advance. It is assumed that an area for recording the file management information group is determined in advance, and the size is obtained by adding the number of sectors necessary for the number of files to be recorded and the number of sectors necessary for error processing. The number of sectors required for error processing is determined depending on how many recording errors are guaranteed. For example, in the case of a DVD-R, since recording is normally performed in units of 16 sectors, there are 16 sectors per time. The number of times may be determined by the specifications of the apparatus. When an error occurs in recording as shown in FIG. 4, recording is performed in the next sector. However, as described above, since Fe and Fid hold the recording information of the link destination, when the directory hierarchy is recorded in order from the ROOT directory, even if an error occurs in the recording of the FID of File1, the FID of File1 The Dir A Fe having the data indicating the position of the file is already recorded, and cannot be corrected in the case of the Write At Once media. For this reason, the following recording is performed to improve robustness against errors.

  The directory hierarchy is not recorded sequentially from the ROOT directory as in the prior art, but is recorded from the end of the directory hierarchy, that is, the FIDs of File1 to File3 in the example of FIG. If recording of the FIDs of File1 to File3 fails, rewrite to the next sector. Next, Dir A Fe, which is the parent directory of the FIDs of File1 to File3, is recorded, but since the FID positions of File1 to File3 have changed from the originally planned positions, the FID position information of File1 to File3 has been corrected Record after. At this time, if a recording error occurs, Dir A Fe is recorded again in the next sector, and then Dir A FID is recorded after correcting the positional information of Dir A Fe. At this time, if a recording error occurs, the DirA FID is recorded in the next sector. Finally, the FE of the ROOT directory is recorded. However, the location of the ROOT directory is recorded in the already recorded UDF Volume layer data. Therefore, the dummy data is recorded in the unused sector up to the sector where the predetermined ROOT directory is recorded, and then the ROOT directory is recorded.

(Embodiment 3)
An identifier for identifying the device and data type of the recorded video / audio data is recorded in the intermediate data described in the embodiment.

  In a DVD recorder, if video / audio data in the DVD-Video format and DVD Video Recording format is mixed and recorded on the media and finalized, the video / audio data of the media cannot be played back by other devices. To do. Therefore, after adding or finalizing, it is determined whether it is recorded by the own device, and then the additional writing or finalizing is performed. When the identifiers do not match, it is possible to prevent the format from being broken as a medium created by another device. These identifiers may be a first identifier for identifying a device and / or a second identifier for identifying a data type.

  Note that the first identifier and the second identifier may be substituted with file names recorded in the intermediate data.

  Here, when new media is used, there is no intermediate data to be determined, so determination is not performed, recording is performed in the format of the video / audio data to be recorded, and when recording is stopped, the format of the recorded video / audio data is set. The second identifier of the adapted content is recorded in the intermediate data.

  The recording method according to the present invention realizes the additional recording of video / audio data to the Write At Once media such as DVD-R and CD-R, the robust recording against the recording error of the media, and the speed of the finalization. Thus, it is possible to realize a system capable of high-speed processing that is highly reliable in the product field of DVD recorders and does not cause the user to feel operability stress.

Explanatory drawing of the structure of the audio-video recording / reproducing apparatus using the recording system of this invention The figure which shows the data format when video / audio data is recorded on DVD-R The figure which shows the data arrangement | positioning of the file management information group previously recorded of Embodiment 1 of this invention The figure which showed the recording method of the file management information group with high robustness with respect to the recording error of Embodiment 2 of this invention The figure which shows the positional relationship between file data and intermediate data when data is newly recorded according to Embodiment 1 or 3 of the present invention, or when recorded data is modified by appending or the like

Explanation of symbols

1 Drive 2 Encoder 3 Recording buffer 4 Decoder 5 Playback buffer 6 Recording / playback control

Claims (11)

Drive for recording video / audio, encoder unit for transmitting video / audio data, recording buffer for temporarily storing video / audio data transmitted by the encoder unit, decoder unit for reproducing video / audio data, and decoder unit And a recording / playback control unit that controls recording and playback of the video / audio data, and the video / audio data is recorded on a disc that can be recorded only once. When recording with a predetermined file and directory structure, a file management information group indicating a file tree relationship from the ROOT directory to the parent directory of the file is recorded in advance on the disc, and the video and audio are recorded at the time of finalizing the disc. Records file management information (first file management information) for data files Video and audio recording and reproducing method comprising Rukoto. The video / audio recording method according to claim 1, wherein the file management information group is recorded in the reverse order of the directory hierarchy. 3. The video / audio recording method according to claim 2, wherein when an error occurs during recording of the file management information group, the file management information group is re-recorded in a sector after the sector in which the error has occurred. 2. The video / audio recording method according to claim 1, wherein the video / audio data can be additionally recorded by recording the first file management information as intermediate data when the recording is stopped. 2. The video / audio recording method according to claim 1, wherein the video / audio data can be additionally recorded by recording, as intermediate data, the position information where the recorded data is recorded when the recording is stopped. Recording a second file management information for linking the recorded file management information group and the first file management information at the time of finalizing the disc, thereby establishing a file tree of the medium; 6. The video / audio recording method according to claim 4, wherein the video / audio recording method is characterized in that: A first identifier, which is device-specific identification information, and a second identifier for identifying recorded video / audio data are recorded at the end of the zone, and recorded using the first identifier and the second identifier. 6. The video / audio recording method according to claim 4, further comprising a mechanism for judging the apparatus and recorded video / audio data. 8. A video / audio recording apparatus for recording by the video / audio recording method according to claim 1. 8. A video / audio reproduction apparatus for reproducing video / audio data recorded by the video / audio recording method according to claim 1. A program for recording in a video / audio recording apparatus by the video / audio recording method according to claim 1 and causing the video / audio reproduction apparatus to reproduce the recorded video / audio data. A medium on which the program according to claim 10 is recorded.

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