JPH11162119A - Data processor and data recording/reproducing method applied to the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a recording format of AV data suitable for DVD-RAM. SOLUTION: At the leading part of a video object unit(VOBU) of AV data, a pack B-PCK indicating the start of the VOBU is provided instead of a navigation pack. After the final video pack (V- PCK) or audio pack (A- PCK) of the VOBU, a predetermined number of reserved packs (R- PCK) for producing a free area are embedded. By thus recording AV data with a blank area provided for each VOBU unit and enabling writing of audio and video data after editing the blank area, the condition of seamless reproduction can be easily satisfied with respect to edited data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing apparatus and a data recording / reproducing method applied to the data processing apparatus. The present invention relates to a data processing device used and a data recording / reproducing method.

[0002]

2. Description of the Related Art In recent years, with the development of computers and multimedia technologies, various computer systems compatible with so-called multimedia have been developed. This type of computer system is provided with a function for reproducing moving images and audio data in addition to text data and graphics data.

[0003] With the development of multimedia in such computers, DVDs have recently attracted attention as new storage media that can replace CD-ROMs. One DVD
-ROM media can record about 4.7 Gbytes of data, which is about seven times the size of current CD-ROMs on one side, and about 9.4 Gbytes of data can be recorded on double-sided recording. By using this DVD-ROM medium, a moving image such as a movie including a large amount of video information can be reproduced on a computer with high quality.

The data structure of video information recorded on DVD-ROM media is defined by the DVD video standard. Video information is roughly classified into two types of data: presentation data and navigation data.

[0005] Presentation data is a set of video objects to be reproduced, and is composed of video, sub-picture, and audio. Video data is compression-coded by the MPEG2 system. In addition, as a coding method of sub-picture and audio, run-length coding, AC-3, and the like are supported. The sub-picture is bitmap data, and is used for displaying subtitles of a movie or displaying options on a menu screen. One video object can include one channel of video data, up to eight channels of audio data, and up to 32 channels of sub-picture data.

[0006] The navigation data is playback control data for controlling the playback procedure of the presentation data. At the time of title playback, the navigation data is interpreted to determine the playback order and playback method of the moving image data, and the playback of the moving image is performed accordingly. Further, a navigation command can be embedded in the navigation data. The navigation command is used to change the reproduction content and the reproduction order of the video data. By using the navigation command, the title creator can define various branch structures in the title. It is possible to create interactive titles.

FIG. 11 shows a volume structure of a DVD video recorded on a DVD-ROM medium. The area in which a DVD video is recorded is composed of a VMG (video manager) that manages the entire volume of the DVD video and a plurality of video title sets VTS. According to the DVD video standard, management information (Control data) called VMGI for VMG and VTSI for each VTS is used so that interactive operation as well as simple reproduction of moving image data can be performed.
ata). Each VTS is composed of a video object set VOBS.

[0008] The video object set VOBS is composed of a plurality of video objects VOB as shown in FIG. Typically, each video object VOB can be divided into a plurality of cells, each cell typically comprising a plurality of video object units VOBU.
It is composed of This video object unit VOBU is 1 GOP or 2 GOP (from 0.5 seconds to 1 GOP).
(Seconds) of video data, in which a video pack V_PCK, an audio pack A_PCK, and a sub-picture pack SP_PCK are multiplexed. At the head of the video object unit VOBU, a navigation pack NV_PCK exists as a substream of moving image data. The navigation pack NV_PCK includes management information called DSI and PCI. Navigation pack NV_PC
The structure of K is as shown in FIG. When reproducing a DVD video, the reproduction order and the reproduction method of the moving image data are determined using management information such as VMGI, VTSI, DSI, and PCI.

[0009]

While such DVD-Video titles have begun to appear on the market, recently, DVDs capable of reading and writing data have been developed.
-Development of RAM media is also underway.

Since the DVD-RAM medium is a large-capacity rewritable medium, it is expected to be used not only for recording moving image data but also as a secondary storage device of a computer. DVD-
RAM media has been attracting attention as a new recording medium replacing video cassettes in consumer devices such as video cameras and video players.

[0011] As described above, DVD-RAM is used for audio and video such as moving images and audio for which real-time performance is important.
It is necessary to coexist video data (hereinafter, referred to as AV data) and digital data (hereinafter, referred to as D data) whose accuracy is important, such as a file used in a computer. However, there is a difference in handling of AV data and D data in the following points.

(1) When a defective sector is encountered during recording on a DVD-RAM medium, if the AV data requires real-time performance, the recording is performed even if the point that the data of that part cannot be stored accurately is ignored. (Such as shooting a sports day with a video camera or recording a golf program on a TV, etc.), while recording D data, rewrites correctly to the alternate sector. This is very important.

(2) Since the AV data is long, it is practically difficult to rewrite the entire data on a DVD-RAM medium after editing. (3) When reproducing AV data, since the continuity in real time must not be impaired, the physical position (physical sector) to be recorded is strongly restricted (the conditions for DVD-ROM seamless reproduction and the essentials). The same). That is, in principle, it is necessary to record data in physically continuous sectors.
When physical sectors are discontinuous, blocks recorded in consecutive sectors before and after the physical sectors need to have a certain length or more.

(4) It is desirable that the DVD-RAM medium can be freely recorded, reproduced, added, edited, etc. by a computer or a DVD recorder. However, the D data does not have to be accessible from the DVD recorder.

(5) When a computer reads and writes a DVD-RAM, it is desirable that the method of creating a conventional OS module (such as a file system) dealing with a magnetic disk or a DVD-ROM is not largely changed. . On the other hand, from the viewpoint of a DVD recorder, it is desirable to concentrate on handling AV data and make it as simple as possible. Therefore, the method of recording AV data on a DVD-RAM basically needs to conform to that of a DVD-ROM.

The present invention has been made in view of the above points, and AV data for which real-time performance is important and D data for which recording accuracy is important are efficiently coexisted on the same recording medium. It is an object of the present invention to provide a data processing device capable of making use of the next generation storage media such as a DVD-RAM, and a data recording / reproducing method applied to the device.

[0017]

In order to solve the above-mentioned problems, the present invention according to claim 1 uses audio-video data and other computer by using a data readable / writable storage medium. In a data processing device capable of recording / reproducing digital data whose main purpose is processing, the recording area of the storage medium includes:
A first recording area for recording the audio / video data and a second recording area for recording the digital data are allocated. The first
Audio / video data recording means for writing on a recording area in a first data format considering its real-time continuity;
Digital data recording means for writing the digital data on the second recording area in a second data format in consideration of the reliability of the recording.

In this data processing apparatus, an area for recording audio / video data and an area for recording digital data are divided, and the area for recording audio / video data and the area for recording digital data are further divided. Different recording formats are used. In this case, for the audio / video data, a recording format is used in consideration of real-time continuity, that is, recording is performed by arranging empty areas periodically. A recording format that takes into account the reliability of recording, such as sector replacement processing and execution of verification, is used. In this way, by changing the recording area and recording format according to the type of data to be handled, AV data for which real-time performance is important and D data for which recording accuracy is important coexist efficiently on the same recording medium. Let it be used.

In particular, by arranging and recording the AV data almost periodically with an empty area, the edited data can be written there. Therefore, the real-time continuity of the edited AV data is also limited. Can be easily satisfied, and seamless reproduction can be performed. That is,
When reproducing audio / video data, it is important in principle to record it in physically continuous sectors. Therefore, for example, a blank area is provided for each video object unit consisting of a group of audio / video data corresponding to a predetermined reproduction time such as 0.5 second, and audio / video data is recorded. By being able to write the audio / video data, it is possible to easily satisfy the condition for seamless reproduction of the edited data.

Further, the present invention according to claim 2 is the first aspect of the present invention.
The audio / video data recorded in the first recording area in the data format described above is composed of a plurality of consecutive logical sectors corresponding to a plurality of consecutive physical sectors on the first recording area in a one-to-one correspondence. And a single file.

As described above, by treating the logical sector and the physical sector as substantially the same, it becomes possible to allocate audio / video data as a single file composed of continuous physical sectors. Therefore, an application program that manages recording and reproduction of audio / video data can easily record audio / video data in consideration of physical sectors. For example, when rewriting the edited audio / video data, the application program can satisfy the conditions required for seamless reproduction only by managing the continuity of physical sectors as the continuity of logical sectors.

Further, the present invention according to claim 4 is characterized in that:
The digital data recording means further comprises means for detecting the presence or absence of a defect in a sector to be written on the recording area or the second recording area, wherein the digital data recording means performs a period during which the digital data is written on the second recording area. When the defect is detected, the digital data write process is interrupted, and the audio / video data recording unit includes:
Attempt or detect writing to the detected bad sector so that even if the defect is detected during the writing of the audio / video data on the first recording area, the writing process of the audio / video data is not interrupted. The writing process is continuously performed by skipping the defective sector.

According to this configuration, even if, for example, the OS or the file system detects an error during the writing, the audio / video data is continuously written, regardless of the presence or absence of the bad sector, By continuing writing almost sequentially while skipping the sector, the recording is continued without interruption. In this case, there is a danger that the information on the portion where writing to the bad sector has been attempted may not be able to be normally reproduced later due to loss of the information. Is a very short period of time, so that it does not cause any problems as long as it is viewed with human eyes or ears, for example, by applying a known technique to eliminate errors in that part as appropriate. be able to.

[0024] As a means for setting an empty area, the audio / video data to be recorded in the first recording area is stored in a video object unit corresponding to a predetermined reproduction time. Means for classifying, and when the data size of the video object unit to be written on the first recording area is smaller than a predetermined data size, means for embedding the shortage with an empty packet for generating the blank area, When the data size of the video object unit to be written on the first recording area is equal to or larger than a predetermined data size, the audio / video data recording means includes means for writing the empty packet following the video object unit. It can be realized by providing.

Further, the present invention according to claim 8 is the first aspect of the present invention.
The audio / video data recorded in the recording area does not include valid time information as time stamp information required for decoding, and an encoded stream including time stamp information is used by using the time stamp information. Decoding means for decoding the audio / video data recorded in the first recording area and converting the audio / video data into an encoded stream decodable by the decoding means. Stream converting means for transferring the audio / video data from the first recording area, and reading the read audio / video data in a predetermined data unit.
Stream converting means for re-attaching the time stamp information based on the size information of the video data.

Normally, in an encoded stream such as MPEG2, time information called time stamp information is included for each video object unit as information for designating the reproduction start timing on the decoding side. However, in the present invention, in order to make it easy to edit audio / video data, the time information is not written on the storage medium, but the time information is re-attached at the time of reproduction, so that encoding such as MPEG2 Converted to a stream. This eliminates the need to change the reproduction start time itself after the edited portion every time editing is performed, and it is possible to improve the efficiency of the editing work.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a basic configuration of hardware and software of a data processing device according to an embodiment of the present invention.

This data processing device is realized as a digital video player, a set-top box, or a personal computer, and has a function of displaying computer graphics and moving images on a dedicated display monitor or a home TV. .

This data processing device includes AV data and D
The main hardware necessary for recording and reproducing data includes a DVD drive 111, a DVD board 112,
VGA controller 113, camera interface 1
14 and a satellite tuner 115.

The DVD drive 111 is a DVD-RAM
/ DVD-ROM / CD-ROM compatible drive device for reading and writing data on DVD-RAM media, DVD-ROM media and CD-ROM
Data is read from the ROM optically.

The DVD board 112 is for encoding / decoding AV data, and has a D
It comprises a VD encoder 201 and a DVD decoder 202 for decoding.

The DVD decoder 202 has a DVD-RAM
/ Decodes AV data (video, sub-picture, audio) composed of an MPEG2 program stream read from a DVD-ROM.
It comprises a system decoder for separating the video, sub-picture and audio multiplexed therefrom from the G2 program stream, and an MPEG2 decoder, sub-picture decoder and audio decoder for decoding the separated video, sub-picture and audio, respectively. ing. The sub-picture decoder and the audio decoder perform the run-length encoding used for encoding the sub-picture and the audio, respectively, and the decoding process corresponding to the Dolby AC3.

The DVD encoder 201 encodes AV data to generate an MPEG2 program stream, and includes an MPEG2 encoder for encoding video, sub-picture, and audio, a sub-picture encode, and an audio encoder. And a system encoder for multiplexing video, sub-picture, and audio.

The DVD board 112 is also provided with a TV encoder 203 for converting the decoded AV data into an NTSC or PAL TV signal.
The VGA controller 113 controls a display monitor such as an LCD or a CRT to display graphics data drawn on an image memory on a screen. The VGA controller 113 includes a DVD board 112.
There is a dedicated video input port for inputting moving image data from the PC. The moving image data input from the video input port is displayed alone or combined with graphics data drawn in an image memory.

The camera interface 114 takes in an image taken from an external video camera into the main memory of the data processing device. The aforementioned DVD encoder 201
It is also used to encode AV data input from an external video camera via the camera interface 114. In addition, the satellite tuner 115 receives a digital TV broadcast composed of an MPEG2 stream provided by digital satellite broadcast and takes it into a main memory of the data processing device. The DVD decoder 202 described above is also used for decoding the digital TV broadcast.

The reproduction of AV data on a DVD-ROM medium, the control of reproduction and recording of AV data on a DVD-RAM medium, and the editing of AV data are performed by a DVD recording / reproduction control program 116. This DVD playback control program 116
An application program that runs on S117, and performs recording / reproduction control of AV data as part of the functions of the OS 117 or using various hardware drivers for multimedia that are prepared independently.

The DVD playback control program 11
6 is provided with a file management function for AV data, whereby a recording process is performed in consideration of real-time continuity of AV data. That is, the storage area of the DVD-RAM medium is divided into a recording area for recording AV data and a recording area for recording various digital data (D data) handled by a computer.
For V data, the DVD playback control program 116
Under the management of the data, writing is performed in a recording format that takes into account the real-time property required for seamless reproduction, such as writing to continuous physical sectors or continuing the writing process regardless of the presence or absence of a defective sector. Under the management of the OS 117 or the file system 118, the data is written in a recording format that takes into account the reliability of the recording, such as interrupting the writing process, replacing a defective sector, and executing verification. Details of the recording format of the AV data used in the present embodiment and the recording / reproducing method thereof will be described with reference to FIG. 3 and the subsequent figures. AV data for which performance is important and D data for which recording accuracy is important can be efficiently coexisted and used on the same recording medium.

Next, taking a case where a personal computer is used as a data processing device as an example, a specific system configuration of the data processing device of the present embodiment will be described. As shown in FIG. 2, the system includes a host bus (processor bus) 1, a PCI bus 2, a CPU 11,
Main memory 12, Host / PCI bridge 13, HDD1
4. Input device 15 such as keyboard / mouse / infrared remote controller, ATAPI interface 16, and DV
It comprises a D drive 111, a DVD board 112, a VGA controller 113, a camera interface 114, and a satellite tuner 115.

The CPU 11 controls the operation of the entire system, and executes the operating system stored in the main memory 12 and the application program to be executed. The reproduction of the AV data recorded on the DVD-RAM medium and the recording of the AV data on the DVD-RAM medium are started by causing the CPU 11 to execute the DVD recording / reproduction control program 116. During playback of AV data, DVD-RA
The AV data on the M medium is once read into the main memory 12 and then read from the DVD decoder 202 of the DVD board 112.
Sent to When recording AV data, for example, AV data input from a camera or the like is once read into the main memory 12 and sent to the DVD encoder 201 of the DVD board 112, where it is converted into an MPEG program stream. This MPEG program stream is recorded on the DVD-RAM medium while being converted into the recording format of the present embodiment on the main memory 12. MPE
When recording a TV broadcast composed of a G program stream, the DVD encoder 201 is not used, and
The AV data of the V program is recorded on the DVD-RAM medium while being converted into the recording format of the present embodiment on the main memory 12. When editing and re-recording AV data already recorded on a DVD-RAM medium, a simple VOB such as cutting a part of the AV data is used.
In the case of editing in units of U, the DVD encoder 201 is not used. In the case of editing in which changes are made inside the VOBU, the DVD encoder 201 is used as necessary.

The DVD board 112 has a PCI interface 204 in addition to the DVD encoder 201, DVD decoder 202 and TV encoder 203 described above.
Is provided. This PCI interface 204
Is provided with a bus master DMA function, whereby a DVD encoder 201 and a DVD decoder 202 are provided.
Data transfer between each and the main memory 12 can be performed efficiently. The PCI interface 20
4 stores digital YUV data output from the DVD decoder 202 as a decoding result in the VGA controller 11.
A video port control circuit 205 for converting the data into a format suitable for the interface of the video input port No. 3 and transferring it to the video input port of the VGA controller 113 is provided. As a bus connecting the video input port of the VGA controller 113 and the DVD board, VES
A standard VAFC (VESA Advanced Fe
ature Connector), VM-Channel
el (VESA Media Channel), S3
An LBP interface or a ZV port can be used. The audio data decoded by the DVD decoder 202 is also sent to an audio controller (not shown) or a line-out terminal via a dedicated bus.

The DVD drive 111 transmits a stream of AV data stored on a DVD medium up to 10.
Reading is performed at a transfer rate of about 08 Mbps. This DVD
The drive 111 includes a DVD medium composed of an optical disk, a motor, a pickup, a pickup drive, a servo controller, and an EC for error detection and correction.
It is composed of a drive controller including a C circuit. Motor, pickup, pickup drive,
Servo controller and drive controller
It functions as a drive device for driving a DVD medium and reading data recorded on the DVD medium.

AV data recorded on DVD media can include main video (video), sub-video (sub-picture) up to 32 channels, and audio (audio) up to 8 channels. MP for video encoding
EG2 is used, and sub-picture and audio are encoded using run-length encoding and DOLBYA, respectively.
C3 is used. Even in this case, the encoded video, sub-picture, and audio are
Handled as a PEG2 program stream.

The encoding processing of the MPEG2 standard is variable rate encoding, and the amount of information to be recorded / reproduced per unit time can be made different. Therefore, the higher the moving rate of the scene, the higher the transfer rate of the MPEG stream constituting the frame group corresponding to the scene, the higher the quality of the moving image can be reproduced.

1. Basic Concept of Recording Format of AV Data and D Data FIG. 3 shows the entire structure of a volume recorded on a DVD-RAM.

As shown in FIG. 3, the DVD-RA
The volume space of the M media is the lead-in (Le
ad-in), volume and file structure for volume and file management (Volume and F)
ile structure), an AV data storage area,
It is composed of a D data storage area including an alternative sector area, and a lead-out.

Here, in order to simplify the following description,
First, the basic concept of the recording format of AV data and D data used in the present embodiment will be briefly described.

As described above, since the required conditions are greatly different between the AV data and the D data, in the present embodiment, the two are treated simply and clearly. In principle, the number of AV data files (AV files) that can be recorded on one DVD-RAM medium is limited to one. This area corresponds to a DVD video zone defined by a DVD-ROM, and includes a video manager (V
MG), and is treated as a single title. DVD-R
If you want to record multiple programs in AM (for example, recording a TV golf broadcast, shooting an elementary school athletic meet, etc.)
Treat each as a separate clip sequence and not separate files. Further, the AV file does not perform the substitute sector processing. This file is allocated as a single file consisting of consecutive physical sectors. From a computer program's point of view, this file is a conventional single file composed of consecutive logical sectors. However, since the AV software, that is, the DVD recording / playback control program 116 is assigned as described above,
Using the logical sector number, it is possible to perform a process conscious of the physical sector.

All the remaining files on the DVD-RAM are in principle file areas for recording D data.
In this area, the computer performs the alternative sector processing as before. Basically, it is considered that a consumer video device such as a DVD recorder does not access this area. As before, the computer can use this area for both D data recording and AV data recording. These files are basically UDF Bri
DVD-RO based on dge structure
M's Volume and File structure
It is described by a structure conforming to re.

When recording AV data in the above-mentioned AV file, in order to make room for subsequent editing, every time data of a certain length is recorded, recording is performed while securing a free area of a certain length or more. . These two constant length values are:
It is necessary to decide within a range that satisfies the conditions for seamless playback as provided by a DVD-ROM, and within that limitation, predict how much editing will be performed, and within a range that does not greatly reduce the recording capacity. The two fixed lengths can be freely selected.

When the above AV file is edited by a computer, the original data is not deleted by the DVD recording / reproduction control program 116 which is the application software, as described below, in principle, and is adapted to the characteristics of the AV data. Edit. As mentioned above, in this edit,
The application manages the continuity of physical sectors as the continuity of logical sectors.

File for D data recording (D file)
When a computer records AV data, the physical sector is completely hidden from the application. This means that CD-
This is the same as the handling of AV data in a conventional computer using a ROM or the like. In this case, the DVD-R
There is basically no concept corresponding to seamless playback of OM. The continuity of AV reproduction is ensured by designing the application itself, for example, by having a large main memory buffer.

In principle, the D file is used by cutting a necessary length from the unused area at the end of the area allocated to the AV file as necessary and redefining it as a D file area.

While recording AV data in an AV file, D
If an error that the sector ID of the VD-RAM cannot be read occurs, and if the condition of seamless playback can be satisfied, the recording block is not used, and a new recording block is started from the next recording block and the erroneous recording block is re-read. Rewrite. In this case, if the conditions for seamless reproduction cannot be satisfied, the recording is continued ignoring the error. The recording block referred to here includes one or more error correction blocks.
The time required by U11 and the time required for the DVD drive to recover from a normal sector ID error (whichever is longer) are set to a minimum size that is sufficiently longer than the length of the advance of the DVD medium. Of course, a sector may be used as a recording block.

Also, at the time of recording, so-called verification for verifying whether the writing of the AV file has been correctly performed is not performed (in the case of a moving image, even if an error is found at the time of reading, a process is performed so that the data of that portion is not noticeable). It is widely known that it is often possible to respond by doing However, if the data is used as a still image (slide show), this is not allowed, and the writing is verified by AV software (the OS and the file system are not concerned). Rewrite to a logical sector (that is, another physical sector) (still images are feasible because they do not have to satisfy the conditions for seamless playback).

In the case of a static display of a moving image by a user's operation (that is, equivalent to a pause in a DVD-ROM), since there is no such provision, a write error that cannot be found because it is not verified is not performed. In addition, the displayed image may be disturbed.

The OS and the file system must execute A
V files are treated differently from D files. That is, in the case of writing to an AV file, even if a fatal error such as a sector ID reading error occurs,
Report the error to the app and continue writing. The interruption of writing is at the discretion of the app.

Hereinafter, the volume structure of FIG. 3 will be specifically described. 2. Data Structure of Entire Volume The top row of FIG. 3 shows an example of data contained in the entire DVD-RAM. g, h, i, etc. represent physical byte positions. Lead-in, Volume and File
Structure and Lead-out are basically the same as those of the DVD-ROM. However, they are not exactly the same. For example, the “Lead-in” portion includes an indication that the storage medium is a DVD-RAM.

The AV files from the physical sectors h to (j-1) are limited to one AV file per medium, and are treated as a special one (details will be described later) by the computer OS and file system. The physical sector j to (k ₈ -1) is a D file area, which is an area allocated to a plurality of files for ordinary digital data.

The main data structures of the AV file and the D file are shown in the second and subsequent rows of FIG. As is apparent from comparison with FIG. 11, A is divided into many files in the past.
The V file is a single and only one AV file per medium. The purpose of this is as follows: (1) Easy handling of AV files Specially, AV files need to be specially handled by the OS and the file system, and such special handling can be facilitated (as an alternative, Volume and File as multiple files with special AV attributes
e Structure).

(2) Easy for the user to handle When recording an image on a DVD-RAM with a camcorder or the like, the user does not need to be aware of the file. For example, considering a case where a TV golf program is recorded on one DVD-RAM and a kindergarten athletic meet is photographed the next morning, it seems to be advantageous to make each file a separate file. However, in various aspects, such as drawing and recording the titles of the records collectively and editing them, the concept of the file as viewed from the user becomes gradually less obvious, and the distinction between the files becomes more troublesome. 2 points.

In such a situation, the DVD-R
The general user of AM does not need the concept of the title set and title of the DVD-ROM, and it is often difficult to distinguish between them.
It is omitted in the present embodiment. Therefore, Video
o Manager (VMG) is also unnecessary, and does not exist in the present embodiment. However, when editing the content recorded on DVD-RAM using a full-fledged editing tool,
In many cases, it is more convenient to change the file structure to conform to the DVD-ROM standard. In the future, DVD-ROM
VMG and Volume Title Se are also used in order to enable error handling without serious problems when a DVD-RAM is mistakenly inserted into a dedicated drive.
It is desirable that there be a data area corresponding to t Information (VTSI). In the present embodiment, the physical sectors k to (i-1) are reserved for that purpose, and a fixed pattern is inserted therein. Instead of doing so, the volume from the physical sector k to (i-1) is set as a file different from the AV file as Volume.
and may be registered in File Structure.

In the case of a DVD-RAM, it is most important that it is easy to use when shooting and using the material of AV data, so in this embodiment, parental management, multiple angles,
MMIs such as menus and buttons, and sub-pictures are not targeted (though a reduced image for searching a captured image is recorded in the above-mentioned VMG / VTSI-compatible area and played back, Has nothing to do with that point). Therefore, there is no need for the concept of a program chain or a cell of a DVD-ROM, and there is no data structure for that.

The right half of FIG. 3 shows the assignment of files to physical sectors on a normal external recording medium for a computer, and the alternative sector processing when an error is found in the recording medium. Here, for D file # 1,
The physical sector to which the end portion of the file is allocated and the physical sector to which the head portion is allocated are not continuous, and the context is reversed. As for the D file # 2, a part of the file is allocated to the physical sector in the substitute area. Such file management is normally performed by the OS and the file system.

In the left half of FIG. 3, how physical sectors are allocated to AV files is shown. That is, the AV file is not allocated to non-contiguous physical sectors as in the case of the D file, and the AV file is allocated to consecutive physical sectors in order. That is, the non-contiguous allocation of physical sectors by the OS and the file system, which is generally performed in a computer, is performed only for the D file and is not applied to the AV file.

The physical sector allocation management for the AV file is performed in such a manner that real-time performance is required by an application program that handles AV data.
This is performed in consideration of the characteristics of the data. That is, the AV application performs processing using logical sector numbers, but as shown in FIG. 3, in an AV file, a plurality of consecutive physical sector numbers and a plurality of consecutive logical sector numbers are sequentially set to 1 with a certain difference. Since it supports one-to-one, in AV software,
Only by considering the logical sector number, as a result, the file management taking the physical sector into consideration can be performed according to the AV data.

When recording AV data in this AV file, in principle, it is recorded in order from the beginning, and the end is left empty. If more space is needed in the D file area, release the end of the AV file and
Reallocate to file area. The AV data recorded in the AV file area is basically handled as one file (even if it is divided into a plurality of parts having different contents).

As a structure of the AV data, one video object set (VOBS) (actually, as described later, a single video object (VOBS)
B)). This makes it possible for a general user who records video on a DVD-RAM using a CAM coder or the like to see the DVD-RAM as a single stream of simple AV data just like a video cassette tape or 8 mm photographic film. It becomes very easy to understand.

As described above, the DVD-RAM is formatted separately into a recording area for recording AV data and a recording area for recording D data, and an alternative sector area is assigned to the D data recording area. . Such a formatting function is provided by an OS, a file system, or a DVD recording / playback control program.

3. Video Object FIG. 4 shows a data structure of a video object set (VOBS) of the present embodiment. In the present embodiment, basically, the content of AV data recorded on a DVD-RAM is treated as a single video object (VOB) regardless of a difference in meaning for a user.
As mentioned above, there is no concept of a cell (it may be considered that a cell always consists of one video object unit (VOBU)), and a VOB consists of a single row of VOBUs. The point that the VOBU is configured as a single pack sequence mainly composed of a video pack (V-PCK) and an audio pack (A-PCK) is a conventional example (DVD-RO).
M) does not change. V-PCK and A-PCK themselves are not different from the conventional example. Here, the sub-picture is VOB
It is assumed that it is not included in U. The point that this embodiment is completely different from the conventional example is that a B pack (B_PCK) having substantially blank contents is placed at the position of the navigation pack of the conventional example (the name of B_PCK is Also referred to as a blank pack or a starting pack, depending on the historical history of.) The main role of the data search information (DSI) in the conventional NV-PCK is to perform high-speed forward transmission, high-speed reverse transmission, high-speed reproduction, high-speed reverse reproduction, etc. It is at the point indicating the position. In the conventional example, a navigation packet (NV-P) containing information on the entire VOB is designed on the assumption that the AV data is created by an authoring tool that can overlook the entire AV data.
CK) is written at the head of each VOBU. DVD-
In the case of a RAM, it must be assumed that the data is written by a CAM coder. Therefore, after encoding the AV data generated in real time, the data is transferred to a DVD-RA as soon as possible.
It is desirable to write to M. Conversely, DVD-R
If you try to record NV-PCK just like OM,
The AV data is stored in a buffer at least until the data of the entire VOB is completed, and after it is determined, the contents of the NV-PCK must be created overlooking the entire contents before writing to the DVD-RAM. Would.

By placing a substantially blank B pack at the position of the NV-PCK which can be written without knowing the entirety of the AV data, such inconvenience can be solved. There is also a method that enables high-speed transmission and high-speed reproduction even in this case. This will be described later.

The playback control information (PCI) of the conventional example includes highlighting in a menu, display of buttons, non-seamless
Includes angle changes, copyright holder notices, etc. Such information is unnecessary in the case of a DVD-RAM as described above. PC
I includes time information called a time stamp, which is indispensable for DVD-ROM reproduction, such as the reproduction start time and reproduction end time of the VOBU. In the present embodiment, a field for this information is used. Also have no. The reason will be described below.

There is a strong demand for simple editing of AV data recorded on a DVD-RAM with a relatively simple tool. For example, editing such as deleting a CM from a television movie. Such simple editing always affects the reproduction start time of the subsequent VOBU. That is, if each VOBU has the reproduction start time itself, there is a disadvantage that the data of all the VOBUs after the edited point must be changed. DVD-RA
In the case of M, the recording position of the information affected as a result of editing must be designed so as to be limited to the local area to be edited (and small data that can be stored in the editing tool).

The PCI of the conventional example also has a field of the elapsed time required for displaying the cell. Since this is local information, the editing problem as described above does not occur, but AV data input in real time is stored in a DVD-R.
In the case of recording on the AM, size information such as the elapsed time required for displaying the VOBU is not known until after the recording, so that in the case of a DVD-RAM, it is not appropriate to record at the beginning of the VOBU. .

Therefore, in this embodiment, the conventional P
We decided not to have any data corresponding to CI. That is, the contents of B_PCK in FIG.
In contrast to this, it is virtually blank.

Next, a description will be given of a method for realizing fast-forwarding, high-speed reproduction (forward direction, reverse direction) and the like for a video just recorded on a DVD-RAM by a CAM coder. That is,
A description will be given of how information corresponding to the DSI of the conventional example is held and used in the present embodiment.

3. As described above, the essential limitation of the high-speed data search DVD-RAM is that the AV data currently encoded and recorded on the DVD-RAM is used.
The point is that no information after the current point of the data can be obtained.
In addition, since the AV data is long, the amount of data that can be placed in the buffer in the tool before writing to the DVD-RAM is almost equal to the whole. That is, D
The data format of the AV file recorded on the VD-RAM is A
It must also be possible to write to the DVD-RAM immediately when V data is generated. In this embodiment,
Under such conditions, high-speed data search is realized as follows. In summary, the technical idea is that recording is performed so that blank sectors are placed at (almost) constant intervals.

The points of the realization method are as follows. Information indicating the entirety of each VOBU is the VOBU B
_PCK, not B_PCK of subsequent VOBU
To record. Since the VOB is configured as a single simple VOBU sequence, the number of VOBUs following the VOBU is always determined to be one.

As shown in FIG. 4, the last VOB of VOB
Since another B_PCK is placed immediately after the U, any VOBU _i always has the following B_PCK.
K "exists. This will be referred to as B_PCK _{i + 1} . B_PCK _{i + 1} includes VOBU _i , VOBU _i−1 ,
.. VOBU _i-2 ,..., Each record the leading logical sector number. Since this is past data, the DVD-RA
M can also be recorded in principle. How far to have the data is just a matter of design.

As shown in FIG. 4, an empty sector is provided at the end of each VOBU, and the default value of the length of each VOBU is made constant. As a result, based on the default values, VOBU _{i + 1} includes VOBU _{i + 2} , VOBU _{i + 3} , and V
OBU _{i + 4} ... It becomes possible to record an estimated value of each head logical sector number. By recording them also in B_PCK _{i + 1} , data corresponding to the DSI of the conventional example is prepared, and high-speed transmission and high-speed reproduction can be performed.

Since the size of each VOBU fluctuates greatly due to the characteristics of the variable length coding of MPEG2, when actually recording VOBU _i , the size may exceed the default value. . In this case, the VOBU _i is written in a continuous area simply by ignoring the default value, and VOBU _i is completed (further, a certain free area is secured for the purpose described later). At this time, B_PCK _i ,
VOB recorded in B_PCK _i-1 , B_PCK _i-2 , ...
The estimated position of U _{i + 1} will be different from the actual _one , but will not be corrected.

For the reasons described above, and even as a result of editing, the DSI equivalent data recorded in B_PCK may be inaccurate.
The entire DSI equivalent data is always treated as an estimated value. That is, if the B_PCK is not actually located at the position indicated by the B_PCK, the B_PCK is sequentially read in a direction after that, and the
Find CK.

Since the above processing is performed, as shown in FIG. 4, at the end of the VOB, following the B_PCK, an E-PCK indicating the end of the VOB has an appropriate length (eg, , 1/10 VOBU) at an appropriate timing (for example, when the power of the CAM coder is turned off).

4. Newly Installed Pack FIG. 5 illustrates a main part of a data structure of a newly installed pack according to the present embodiment, using B_PCK as an example. This pack structure is basically common to all new packs (B pack, R pack, and E pack).

The pack start code at the head of the pack is 000001BAh as in the conventional example. The SCR (system clock reference), which is time stamp information, is always set to zero by use as described above. This means that the conditions to be satisfied as the MPEG2 program stream are not satisfied. Therefore, the identification flag indicating that the stream is an MPEG2 stream, that is, the first two bits of the SCR part is set to “01” in the conventional example.
However, in this embodiment, it is set to “10”. In other words, this makes it possible to identify that the pack is a new pack, thereby preventing erroneous decoding processing.

As described above, since the coded stream of AV data handled in the present embodiment does not satisfy the MPEG2 standard, it is not decoded even if it is sent to the MPEG2 decoder as it is. At least the above two points (the first two bits of the SCR part and the SCR value itself)
It is necessary to send the data to the MPEG2 decoder after changing it to conform to the standard No. 2. This processing is usually performed on a V that has a length of 0.5 seconds.
Since there are two places in the OBU as described above, the CAM
It can be easily realized even with a tool that strongly demands simplicity such as a coder.

The main part of the data structure of the new pack is almost the same as the conventional example. This is because the MPEG2 stream needs to be accepted by the MPEG2 decoder. Conventionally, a PCI packet and D
In this embodiment, the SI packet is stored.
It has been changed to one packet. Conventionally, “0” is used for PCI and “1” is used for DSI as a substream ID of a packet. In the present embodiment, B pack, R pack,
“16”, “17”, and “18” were assigned to the E packs, respectively. These streams, like the PCI sub-stream and the DSI sub-stream of the conventional example, are positioned as private streams. Since the contents are not decoded by the MPEG2 decoder, these sub-stream numbers and the contents are In terms of point you can design freely. Therefore, description of the detailed data structure of the present embodiment is omitted. Both the R pack and the E pack do not substantially require detailed packet data. In this embodiment, the packet content of the R pack is a blank character,
The packet contents of the pack are filled with the repetition of the character string "EOF".

The contents of the packet of the B pack include the following items within the range related to the present invention. The length of the immediately preceding VOBU, that is, the time required for reproduction (EL
(P_P_VOBU)-First logical sector of neighboring VOBU-Recording date and time-Recording serial time code-Seamless recording flag-Still flag-Delete flag Also, there are items to be recorded only in the B pack of the first VOBU as follows. (This is one piece of data in the DVD-RAM, and the storage location can be changed in various ways.) Default VOBU size Position of the last B pack (logical sector number) Flag for updating AV data AV data recording / reproducing processing method (1) AV file writing processing Next, referring to the flowchart of FIG.
The writing process for the M medium will be described.

The file writing process for the DVD-RAM medium is performed in sector units in the case of both AV data and D data, as in the case of normal disk writing (step S101). In the data write processing in sector units, the OS1
17 or the file system 118 determines the physical sector number of the write destination, and the data is written there. In the case of writing an AV file, data is sequentially written to consecutive physical sectors, and in the case of a D file, normal writing is performed in consideration of the position of an empty sector. Here, if the sector ID of the write destination physical sector cannot be read, an error is detected there (step S102). OS 117 or file system 118
Detects that an error has occurred, if the file currently being written is a D file (N in step S103)
O), the writing process is interrupted and normal error processing is performed (step S105). However, if the file being written is an AV file (YE in step S103).
S), the occurrence of an error is recorded in the DVD recording / reproduction control program 1
16, the writing process is continued (step S105).

In this continuation processing, writing to a defective physical sector in which an error is detected is tried, or writing is continued to the next consecutive physical sector or error correction block, skipping the defective physical sector. In this way, the DVD-
It can also be instructed when instructing writing to the RAM.

Thus, the file to be written is A
The processing when an error occurs differs depending on whether the file is a V file or a D file, and the writing process is continuously executed for an AV file, so that a TV program, a video image shot by a camera, etc., can be read in real time on a DVD-
It is possible to write to the RAM. Also, there is a danger that the information of a portion where writing to a defective sector has been attempted may not be able to be normally reproduced later due to the loss of the information. However, when converted by the reproduction time of the AV data, the amount of lost information is extremely large. Since it is only a short time, if a well-known error correction process is appropriately performed, there is no problem as long as the image is viewed with human eyes or ears.

(2) VOBU Recording Process of AV Data Next, with reference to the flowchart of FIG. 7, a VOBU recording method for recording AV data while periodically sandwiching empty areas equal to or more than N _R packs will be described. explain.

In writing a VOBU, the DVD recording / reproduction control program 116 counts up the value of the number of packs that have been written each time V_PCK or A_PCK constituting the VOBU is written (step S201, step S201). S201). And VO
The writing of V_PCK or A_PCK is repeatedly executed until the BU is completed, that is, until a pack corresponding to a reproduction time of 0.5 second is written (step S).
103). Next, the DVD recording / reproduction control program 1
16 is the actual VOBU obtained from the count value
Is compared with the default value of the VOBU size (step S204). If the actual VOBU size is smaller than the default value, the actual VOBU size is reduced as shown in FIG. 8 as VOBU1. Is written to the default value (step S205). When the actual VOBU size is equal to or larger than the default value, a predetermined number (N _R pieces) is set as shown in FIG. 8 as VOBU2. ) Is written (step S206). In either case, the minimum R_PCK required to set a blank area of a certain size or more is written.

Thereafter, the DVD recording / reproduction control program 116 executes the B_
The PCK is written, and information such as the actual size (including R_PCK) of the immediately preceding VOBU is recorded therein.

As described above, a blank area is provided for each VOBU to record AV data, and the edited audio / video data can be written in the blank area, so that the edited data can be seamlessly reproduced. The condition can be easily satisfied. Therefore, it is possible to record AV data in a format considering real-time continuity.

(3) AV Data Search Process Next, referring to the flowchart of FIG.
A method of searching for AV data using the estimated value of the “leading logical sector of the neighboring VOBU” in the CK (see FIG. 5) will be described.

DVD recording / reproduction control program 116
First, based on the type of search to be executed (high-speed forward, high-speed reverse, high-speed reproduction, high-speed reverse reproduction, and the like), which data (n-pieces before / after) from the current VOBU is determined (step S302). ). Thereafter, the head logical sector position of the determined n-th previous / next VOBU is set to the B of the current VOBU.
_PCK is checked, and the VOBU at that position is read (step S303). The read data is B_PCK
If (YES in step S304), the VOBU
(V) is displayed (step S308). On the other hand, if the read data is not B_PCK (step S
It is determined whether the data is E_PCK (step S305). If it is E_PCK, since the end of the AV file has been passed, predetermined error processing is performed and the search is terminated (step S30).
7). If it is not E_PCK, the next pack (one after) is examined in order regardless of the search direction (step S3).
06), when the B_PCK is read out,
The VOBU corresponding to K is displayed.

The processes of steps S302 to S308 are repeatedly executed until the search process is completed (step S309). (4) AV File Playback Processing Next, with reference to the flowchart of FIG. 10, a method of converting an AV file to an MPEG2 stream, which is executed at the time of playback of an AV file, will be described.

As described above, the VOBU of the AV file
Does not set a valid SCR value, and the 2-bit stream flag is set to “10” instead of “01” indicating the MPEG2 stream. It is necessary to transfer the data to a DVD decoder after converting the data to an MPEG2 stream.

As shown in FIG. 10, at the time of reproduction, first, initial setting of a variable i and SCR_W is performed (step S401). Where i is the number of the VOBU
In this embodiment, since the AV file starts with VOBU0, i is initialized to zero. SCR_W is an SCR storage location in the apparatus, that is, a work area. This is also initialized to zero and V
Each time an OBU is read, the time required for reproducing the VOBU is added to the value to obtain the SCR value at the start of the VOBU required by MPEG2. This is V
A data stream conforming to the MPEG2 standard can be obtained by writing the SCR field in the OBU in a predetermined format and rewriting the flag of the first two bits of the SCR part to 01. By adding this to the MPEG2 decoder, the video and audio stored in the DVD-RAM can be reproduced (steps S403 to S405).

That is, in step S403, VOBUi
Is read, and in step S404, VOB
ELP_P_VOB set in B_PCK of Ui
The value of Ui is added to the current SCR_W, which is
_W. As a result, the value of SCR_W is set to a value corresponding to the sum of the sizes (reproduction times) of the VOBUs that have been read so far. The value of this SCR_W is the VOBUi currently being read in step S405.
Is registered as the SCRi, thereby
Is corrected from the fixed value “0” to a correct value. Also,
In step S405, the stream flag is also rewritten, and the 2-bit stream flag is modified to “01” indicating the MPEG2 stream. The VOBUi thus modified is transferred to the DVD decoder (step S406).

As described above, at the beginning of VOBUi, the length of VOBU (i-1) (the time required for reproduction) is
Note that it is recorded as ELP_P_VOBUi. ELP_P_VOBU0 is of course always promised to be zero.

[0102]

As described above, according to the present invention,
AV data, for which real-time performance is important, and D data, for which recording accuracy is important, can coexist efficiently on the same recording medium, and can be used next-generation storage media such as DVD-RAM. It can be effectively used for both computers and consumer video equipment. In particular, by recording the AV data in a format in which real time continuity is considered by arranging empty areas almost periodically, it becomes possible to easily satisfy the restriction on the real time of the edited data,
Seamless playback can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of hardware and software for realizing a data processing device according to an embodiment of the present invention.

FIG. 2 is an exemplary block diagram illustrating an example of a specific hardware configuration of the data processing apparatus according to the embodiment.

FIG. 3 is a diagram illustrating a DV used in the data processing apparatus according to the embodiment;
The figure which shows the volume structure on D-RAM.

FIG. 4 is an AV diagram used in the data processing apparatus according to the embodiment;
FIG. 4 is a diagram for explaining a data structure.

FIG. 5 is an AV used in the data processing apparatus according to the embodiment;
The figure which shows the structure of the B_PCK pack of data.

FIG. 6 is an exemplary flowchart illustrating the procedure of a file writing process applied to the data processing apparatus of the embodiment.

FIG. 7 is an exemplary flowchart illustrating the procedure of a writing process of a video object unit applied to the data processing apparatus of the embodiment.

FIG. 8 is an exemplary view for explaining the size of a video object unit used in the data processing apparatus according to the embodiment;

FIG. 9 is an AV applied to the data processing apparatus of the embodiment;
9 is a flowchart illustrating a procedure of a data search process.

FIG. 10 shows A applied to the data processing apparatus of the embodiment.
9 is a flowchart showing the procedure of V data reproduction processing.

FIG. 11 is a diagram showing a volume structure of a DVD-ROM.

FIG. 12 is a view showing the structure of a video object set used in the DVD-ROM of FIG. 11;

FIG. 13 is a view showing the structure of a navigation pack used in the DVD-ROM of FIG. 11;

[Explanation of symbols]

 111 DVD-RAM drive 112 DVD board 113 VGA controller 114 Camera interface 115 Satellite tuner 116 DVD recording / playback application program 117 Operating system 118 File system 201 DVD encoder 202 DVD decoder

Claims (17)

[Claims] 1. A data processing apparatus capable of recording / reproducing audio / video data and other digital data mainly for other computer processing using a data readable / writable storage medium. In the recording area of the storage medium, a first recording area for recording the audio / video data and a second recording area for recording the digital data are allocated. Audio / video data recording means for recording the audio / video data on the first recording area in a first data format in consideration of its real-time continuity while arranging the digital data on a periodic basis; Digital data recording means for recording on the area in a second data format in consideration of the reliability of the recording. Characteristic data processing device. 2. The audio / video data recorded in the first recording area in the first data format is composed of a single file. The audio / video data is recorded on a plurality of continuous physical sectors on the first recording area. The data processing apparatus according to claim 1, wherein the data is recorded. 3. A replacement area for replacing a defective sector is provided in the second recording area, and each file on the second recording area including the replacement area includes a physical sector on the second area. 2. The data processing device according to claim 1, wherein a relationship between the logical sector and a corresponding logical sector is managed including the replacement area. 4. The apparatus according to claim 1, further comprising: means for detecting the presence or absence of a defect in a sector to be written on the first recording area or the second recording area, wherein the digital data recording means When the defect is detected during the writing period of the digital data, the writing process of the digital data is interrupted, and the audio / video data recording unit writes the audio / video data on the first recording area. In order to prevent the writing process of the audio / video data from being interrupted even if the defect is detected during the period, the writing is performed by trying to write to the detected defective sector or skipping the detected defective sector. 2. The data processing apparatus according to claim 1, wherein the processing is performed continuously. 5. The data processing apparatus according to claim 1, wherein the empty area is provided for each video object unit composed of a group of audio / video data corresponding to a predetermined reproduction time. 6. The audio / video data recording means: means for dividing the audio / video data to be recorded in the first recording area into video object units corresponding to a predetermined reproduction time; When the data size of the video object unit to be written on is smaller than a predetermined data size, means for embedding the shortage with a free packet for generating the free area; and a video object to be written on the first recording area. 6. The data processing apparatus according to claim 5, further comprising: means for writing the empty packet following the video object unit when the data size of the unit is equal to or larger than a predetermined data size. 7. When editing audio / video data recorded in the first recording area, the edited audio / video data is
2. The data processing apparatus according to claim 1, wherein a part of the video data is written in the empty area. 8. An encoded stream including time stamp information, wherein the audio / video data recorded in the first recording area does not include valid time information as time stamp information necessary for decoding the audio / video data. Decoding means for decoding the audio and video data encoded and recorded in the first recording area when reproducing the audio and video data.
Stream converting means for converting video data into an encoded stream decodable by the decoding means and transferring the stream to the decoding means, wherein the audio / video data is read from the first recording area, 2. The data processing apparatus according to claim 1, further comprising a stream conversion unit for re-attaching the time stamp information based on the size information of the preceding audio / video data already read in data units. 9. A data processing device for recording audio / video data using a data readable / writable storage medium, comprising: encoding means for digitally compressing and encoding audio / video data; Compression-encoded audio
Means for writing video data to the storage medium while arranging free areas substantially periodically. 10. A data processing apparatus for recording / reproducing audio / video data by using a data readable / writable storage medium, wherein the digital compression-encoded audio / video data corresponds to a predetermined reproduction time. Means for dividing into video object units, adding invalid time information as time stamp information necessary for decoding each video object unit, and writing the invalid time information to the storage medium; and the audio / video data recorded on the storage medium Means for correcting the value of each time information included in the audio / video data read from the storage medium on the basis of the size information of the preceding audio / video data already read; and Read out from the storage medium by using as time stamp information And a decoding means for decoding the audio / video data. 11. A data processing apparatus for recording / reproducing audio / video data by using a data readable / writable storage medium, wherein the digital compression-encoded audio / video data corresponds to a predetermined reproduction time. Means for dividing the video / object data into video object units, recording the audio / video data on the storage medium by adding predetermined header information to the head of each video object unit, Means for writing in the header information of the next video object unit following the object unit. 12. A data recording / reproducing method for recording / reproducing audio / video data and other digital data mainly for computer processing using a data readable / writable storage medium, In the recording area of the storage medium, a first recording area for recording the audio / video data and a second recording area for recording the digital data are allocated, and the first recording area or Detecting the presence or absence of the defect in the sector to be written on the second recording area, and when the defect is detected, if the data to be written is the digital data, interrupt the writing process;
If the data to be written is the audio / video data, the process of writing the audio / video data is continued by trying to write to the detected bad sector or skipping the detected bad sector. A data recording / reproducing method characterized in that: 13. A data recording method for recording audio / video data using a data readable / writable storage medium, comprising the steps of: converting a digital compression-encoded audio / video data to a video object corresponding to a predetermined reproduction time; A data recording method comprising: writing data in a video object unit while sandwiching an empty area in which data is not substantially recorded in a unit into continuous units. 14. When editing a video object unit recorded on the storage medium, a part of data of the video object unit after the editing is written in a free area corresponding to the video object unit before the editing. 14. The data recording method according to claim 13, wherein 15. A data recording / reproducing method for recording / reproducing audio / video data by using a data readable / writable storage medium, wherein the digital compression-encoded audio / video data is reproduced at a predetermined reproduction time. The video object unit is divided into corresponding video object units, and fixed or invalid time information is added to each video object unit as time stamp information necessary for decoding the video object unit, and the time stamp information is written to the storage medium. When reproducing the video data, the value of each time information included in the audio / video data read from the storage medium is corrected based on the size information of the preceding audio / video data already read, and the corrected time information is corrected. Is read from the storage medium using Data recording / reproducing method characterized by decoding the audio and video data. 16. A storage medium used for recording / reproducing audio / video data and digital data mainly for other computer processing, wherein a recording area of the storage medium includes the audio / video data. A first recording area for recording video data, and a second recording area including an alternative area and used for recording the digital data.
A recording area is allocated, and the audio / video data recorded in the first recording area is composed of a single file allocated to a plurality of continuous physical sectors on the first recording area. A storage medium characterized by the above-mentioned. 17. A storage medium used for recording / reproduction of audio / video data, wherein the storage medium stores digital compression-encoded audio / video data in a video object unit corresponding to a predetermined reproduction time. A storage medium characterized by being recorded in a divided manner, and having an empty area in which data is not substantially recorded between successive video object units.