JP2002279766A - Device and method for playing back disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for playing back a disk with which desired data can reliably be played back even when there are unacquirable DSI(data search information) data, and to provide a method for playing back the disk. SOLUTION: A disk playback unit 1 skips a VOBU(video object unit) including DSI data when the DSI data unacquirable due to the scratch or the like of a DVD 20 are detected in the execution of a manual search. Then the disk playback unit 1 acquires the next search destination address of a search destination corresponding to DSI data not acquired previous time based on a search destination address indicated by DSI data acquired normally previous time, sets it as a target VOBU and plays it back. When DSI data are acquired normally, data for playback corresponding to the DSI data are played back, and the table number of a search destination address used when the DSI data are not read out previous time is cleared.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus and method for reproducing content data recorded on an optical disk and composed of a plurality of VOBUs.

[0002]

2. Description of the Related Art Hitherto, with the advance of data compression technology, DVD (Digital Versatile Disc) video has been developed as a high-density recording type optical recording medium capable of recording a large amount of data. DVD video is recorded as a change in physical state (pits) in a multiplexed state in which a compression-encoded video signal and audio signal are multiplexed, and is reproduced by a dedicated disk reproducing device in synchronization with each signal. Such a disk reproducing apparatus reproduces data from an optical disk in the same manner as a disk reproducing apparatus that reproduces data from an optical recording medium represented by a CD (Compact Disc) (hereinafter, referred to as an “optical disk”). Since the means is not in contact, it is possible to handle multi-angle content data that requires random access.

Hereinafter, a general data structure of a DVD video will be described. A DVD video has a VTS (Video Title Set) as the largest recording unit, and the VTS is, for example, a VOBS that has a data group for one movie as one unit.
(Video OBject Set). VOBS
Has a plurality of VOBs (Video OBjects) each having a data group obtained by combining a plurality of scenes as one unit, and the VOB stores data of several minutes to several tenths or data of several cuts. It is composed of a set of cells.

[0004] Further, a cell is a VOBU (Video OBject Uni- ject) that uses moving image data of 0.8 to 1.2 seconds as one unit.
t). VOBU is MPEG (M
ovingPicture Experts Group) and has management data (navigation data) for managing the reproduction order and the like of the data for compression and encoding by the two methods.

[0005] The management data has attributes of reproduction data and control information necessary for reproduction.
ol Information) data, DSI (Data Search Inform)
ation) data, VMGI data, and the like. P
CI data is reproduction control information for determining reproduction information according to the state of reproduction data, and DSI data is
This is data search information regarding FF (forward fast-forward) playback, REV (reverse fast reverse) playback, and continuous playback.

When performing a multi-angle playback of a DVD video having the above-described structure by a disk playback apparatus, a manual search is performed to find a sector in which the next DSI data is recorded due to scratches, dust, vibration, etc. on the disk. Since the data cannot be read, the last sector of the VOBU and the next search destination are unknown, and there is a possibility that the data cannot be reproduced. In such a case, in the conventional disk reproducing apparatus, first, sequential reproduction is continued until reproduction of requested data is completed, or second,
The reproduction process was stopped in order to perform the recovery process on the assumption that the read error occurred.

[0007]

However, in the conventional disk reproducing apparatus, as shown in FIG. 3, multi-angle content data in which reproduction data having the same angle number is stored in one sector at intervals. When C is reproduced, the next jump destination is unknown, and the following problem may occur.

First, in a first method of continuing the sequential reproduction until the reproduction of the requested data is completed, D
As a result of not being able to acquire SI data, there is a possibility that the playback data of Angles 2 and 3 will be played back even if Angle 1 is selected. In this case, video and music different from the video and music originally desired to be viewed based on the user's request are reproduced.

Further, in the second method in which the reproduction process is stopped on the assumption that a read error has occurred, DSI data cannot be obtained, and as a result, further data cannot be reproduced. Further, even when the same sector on the disk is reproduced endlessly by the servo operation, it may not be possible to proceed to the previous data.
In any of these cases, the user could not watch the video or music that he or she wanted to view.

An object of the present invention is to provide a disk reproducing apparatus and a disk reproducing method capable of reliably reproducing desired data even when there is DSI data that cannot be obtained.

[0011]

The present invention has the following features to solve the above-mentioned problems. In the following description of the means, the names of components corresponding to the embodiments and reference numerals in the drawings are exemplified in parentheses.

According to the first aspect of the present invention, there is provided a disk reproducing apparatus (for example, content data C of FIG. 3) recorded on an optical disk (for example, the DVD 20 of FIG. 1) and configured by a plurality of VOBUs. For example,
In the disc reproducing apparatus 1) of FIG. 1, reproduction control means (for example, the control unit 2 of FIG. 1) for sequentially reading and reproducing reproduction data such as video and audio included in the VOBU, and DSI data included in the VOBU Is read out, and V including reproduction data to be reproduced next time by the reproduction control means is read out.
Address acquisition means (for example, the control unit 2 in FIG. 1) for acquiring the search destination address of the OBU, and when the DSI data cannot be read by the address acquisition means, the DSI
VOBU including data is skipped, and D
Address setting means (for example, the control unit 2 in FIG. 1) for setting a search destination address of the VOBU including the reproduction data based on the SI data.

According to a fourth aspect of the present invention, in a disk reproducing method for reproducing content data recorded on an optical disk and composed of a plurality of VOBUs, reproduction data such as video and audio included in the VOBU is sequentially read and reproduced. A reproduction control step for reading the DSI data included in the VOBU, and an address obtaining step for obtaining a search destination address of the VOBU including the reproduction data to be reproduced next time, and the DSI data cannot be read in the address obtaining step. In this case, the VOBU including the DSI data is skipped, and an address setting step of setting a search destination address of the VOBU including the reproduction data based on the previously obtained DSI data is included.

Therefore, when there is DSI data which cannot be read due to a damaged portion on the optical disc, the reproduction data having the same angle number is reproduced when the content data is stored in one sector. However, the destination of the next flight will not be unknown.

The content data is, for example,
Any data such as a VTS, a VOBS, a cell, etc. may be used as long as it is composed of a plurality of VOBUs, and the data capacity is arbitrary.

According to a second aspect of the present invention, in the first aspect of the invention, the address setting means sets the next search destination address next to the VOBU including the previously acquired DSI data to the VOBU including the reproduction data. Is set as a search destination address.

Therefore, even if there is DSI data which cannot be read out due to a damaged portion on the optical disk, the reproduction data having the same angle number can always be reproduced sequentially. For this reason, a content different from the content that the user originally wants to view is not reproduced. Also, the reproduction is not stopped due to the read error, and the same data is not repeatedly reproduced.

According to a third aspect of the present invention, in the second aspect of the present invention, the search destination address set by the address setting means exceeds the search destination address of the VOBU located at the end of the content data. Further, an error recognizing means (for example, the control unit 2 in FIG. 1) for recognizing an error is further provided.

Therefore, based on the search destination address of the VOBU that does not exist in the content data, an efficient data search can be performed without issuing a useless search request.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and operation of a disk reproducing apparatus 1 according to an embodiment of the present invention will be described below with reference to FIGS.

First, the configuration will be described. With reference to FIG. 1, an internal configuration of the disc reproducing apparatus 1 will be described. FIG. 1 is a block diagram showing a functional configuration of the disk reproducing device 1. As shown in FIG. 1, the disc reproducing apparatus 1 includes a control unit 2, an RO
M3, input unit 4, display unit 5, RF circuit 6 having pickup 6a, RAM 7, video decoder unit 8, NTSC conversion unit 9 connected to monitor M, audio decoder unit 10, D / A connected to speaker S It is composed of a conversion unit 11,
The respective units are connected to each other via a bus so that various signals can be transmitted and received.

The control unit 2 reads out various control programs stored in the ROM 3 and combines the functions of a system controller for centrally controlling the operation of each block and a demultiplexer for dividing and outputting data according to the control programs. Have. That is, the control unit 2 performs a decoding process such as an error correction on the reproduction data encoded by the RF circuit 6, and outputs the compressed video data and the M
It is divided into compressed audio data conforming to the PEG audio standard, and each data is synchronized based on the synchronization signal.
The compressed video data is output to the video decoder unit 8, and the compressed audio data is output to the audio decoder unit 10.

A ROM (Read Only Memory) 3 stores various control programs such as a reproduction control processing program corresponding to the disc reproducing apparatus 1 in advance. The input unit 4
By outputting the operation of various instruction buttons such as reproduction start and reproduction stop to the control unit 2 as an input signal, the operation of the user and the processing of the control unit 2 are mediated. The display unit 5 is an LCD (Liquid
Control unit 2 having a liquid crystal display screen such as a crystal display
According to the instruction of the display signal input from the CPU, the processing state and the contents of the instruction are displayed on the screen to notify the user.

The RF circuit 6 converts data recorded in a sector formed on the recording layer of the DVD 20 by servo processing such as track servo and focus servo into RF (Radio) data.
Frequency) signal is read, and the RF signal is converted into a waveform and encoded to generate digital data and a synchronization signal thereof.

A RAM (Random Access Memory) 7 stores a ROM 3 in each process executed and controlled by the control unit 2.
And a temporary storage area for the digital data generated by the RF circuit 6 and the control program read from the control circuit. In the RAM 7, the search destination address used for the data search by the control unit 2 in the reproduction control process described later is associated with a table number (natural number) of a table that is stored historically as the previous search destination address. It is memorized.

The video decoder 8 decompresses the compressed video data into video data in the form of linear PCM and outputs it to the NTSC converter 9. The NTSC conversion unit 9 is a D / NTSC conversion circuit that converts video data supplied from the video decoder unit 8 into an NTSC (National Television System Committee) signal or a PAL (Phase Alternating Line) signal that can be reproduced on the monitor M. .

The audio decoder section 10 expands the compressed audio data into audio data in the form of linear PCM and outputs it to the D / A converter 11. The D / A conversion unit 11 is a D / A conversion circuit that converts audio data supplied from the audio decoder unit 10 into an analog signal that can be reproduced by the speaker S.

Next, the operation of this embodiment will be described. Hereinafter, the reproduction control process will be described with reference to FIG. When the optical disc 20 is loaded in the disc reproducing apparatus 1 and the reproduction button is pressed, the control unit 2 reads out the operation program for executing the reproduction control processing described below from the ROM 3 and expands the operation program in the RAM 7, and also loads the operation program into the RAM 7 in FIG. Execute various operations according to.

First, when there is a search request for desired content data from the user (step S1), the control unit 2
By accessing the DVD 20, the search for the content data is started. When the search is completed (step S2;
Y), the control unit 2 determines the D in the searched content data.
It reads the SI data and determines whether there is any unreadable DSI data (step S3). If the search does not end in step S2 (step S2; N),
Continue the search until the search ends.

If no unreadable DSI data is detected in step S3 (step S3; N), the RAM
7 clears the table number of the search destination address used in the previous search process stored in the previous search processing (step S7).
4). However, if the search process started in step S1 is the first search process executed during execution of the main reproduction control process, step S4 is omitted and step S4 is omitted.
You may proceed to 5.

Next, the control section 2 searches for a search destination address indicated by the detected DSI data and acquires it as the next search target (step S5). This search process
Specifically, D is used as search information such as the time interval between VOBUs.
VOBU_SRI (VOBU SeaRch included in SI data)
Information).

Subsequently, the control unit 2 reproduces the VOBU (step S6). That is, the control unit 2 takes in the reproduction data from the VOBU of the search destination address acquired in step S5, and divides the reproduction data into compressed video data and compressed audio data. Then, the compressed video data is output to the monitor M via the video decoder section 8 and the NTSC conversion section 9, and the compressed audio data is output to the speaker S via the audio decoder section 10 and the D / A conversion section 11.

Next, the control unit 2 checks all VOBUs included in the content data requested to be searched in step S1.
Is determined (step S7). If it has been reproduced, the present reproduction control process is terminated. If it has not been reproduced, the next VOBU is reproduced.
And the subsequent processing is executed. A series of processes in steps S1 to S7 is repeatedly executed until the reproduction of all VOBUs constituting the content data is completed.

Next, in step S3, the unreadable D
The case where the SI data is detected (Step S3; Y) will be described in detail. When unreadable DSI data is detected, the control unit 2 determines whether the DSI data is data that could not be read last time (step S8). Step S
8; Y), the table number of the search destination address used in the previous search processing is obtained from the RAM 7 (step S).
9), 2 is added to the table number of the obtained search destination address (step S10). As a result, the next search address after the VOBU including the DSI data acquired in the previous search process is set as the search address of the VOBU to be reproduced.

Next, as a result of the addition, the control unit 2 sets the search destination address to the VOBU located at the end of the content data.
Is determined (step S11). If not exceeded (step S11;
N), the control unit 2 sets the VOBU of the search destination address as the next search target based on the table number of the search destination address added in step S10, and issues a search request (step S12).

On the other hand, in step S11, as a result of the addition, the search destination address is the V at the end of the content data.
If the address does not exceed the OBU search destination address (step S11; Y), the control unit 2 recognizes that an error has occurred (step S14), and ends the main reproduction control process.

In step S8, step S
If it is determined that the DSI data detected in step 3 is data that could not be read last time (step S8; N), the control unit 2 acquires the table number of the specified search destination address from the RAM 7 (step S13). ), A request to read out the DSI data is made again, and the processing shifts to the processing after step S10.

As described above, the disc reproducing apparatus 1 according to the present invention allows the DVD 20
If DSI data that cannot be obtained due to scratches on the
The VOBU including the DSI data is skipped and not reproduced. Then, based on the search destination address indicated by the DSI data that was successfully acquired last time, the search destination next to the search destination corresponding to the DSI data that could not be previously acquired is acquired, set as a target VOBU, and reproduced. . Therefore, even in the case of reproducing multi-angle content data in which VOBUs having the same angle number are stored in an intermittent manner, a video not intended by the user is not reproduced or the reproduction is not stopped, and natural reproduction is always performed. It becomes possible. Further, even if the DSI data cannot be read due to the servo operation, by referring to the search destination address indicated by the DSI data, the unreadable area can be skipped and the reproduction can be continued.

The description contents in the present embodiment are as follows.
1 is a preferred example of a disc reproducing apparatus 1 according to the present invention,
It is not limited to this. For example, in the present embodiment, the optical disc is described as a DVD, but the present invention is not limited to this, and any recording medium on which multi-angle content data is recorded may be used. In addition, the factors that make it impossible to read the DSI data on the sector are not limited to the damage to the disk, but the data cannot be read temporarily due to fingerprints, external impact, etc., bugs in various control circuits, non-compliance with the format of compressed data And so on. In addition, the detailed configuration and the detailed operation of the disc reproducing apparatus 1 can be appropriately changed without departing from the spirit of the present invention.

[0040]

According to the first or fourth aspect of the present invention,
When there is DSI data which cannot be read due to a damaged portion on the optical disc, even if the content data in which the reproduction data having the same angle number is discretely stored in one sector is reproduced, the next time The destination does not become unknown.

According to the second aspect of the present invention, in addition to the effects of the first aspect, even if there is DSI data which cannot be read due to a damaged portion on the optical disk, the same angle number is always assigned. Can be sequentially reproduced. For this reason, a content different from the content that the user originally wants to view is not reproduced.
Also, the reproduction is not stopped due to the read error, and the same data is not repeatedly reproduced.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, there is no need to issue a useless search request based on the search destination address of the VOBU which does not exist in the content data. Data search becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a functional configuration of a disk reproducing device 1 according to the present invention.

FIG. 2 is a flowchart showing a playback control process executed by the disc playback apparatus 1 of FIG. 1;

FIG. 3 is a diagram illustrating a data configuration example of multi-angle content data C;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 disc reproducing device 2 control unit 3 ROM 4 input unit 5 display unit 6 RF circuit 6a pickup 7 RAM 8 video decoder unit 9 NTSC conversion unit 10 audio decoder unit 11 D / A conversion unit 20 DVD M monitor S speaker

Claims (4)

[Claims] 1. A disk reproducing apparatus for reproducing content data recorded on an optical disk and composed of a plurality of VOBUs, comprising: a reproduction control means for sequentially reading and reproducing reproduction data such as video and audio contained in the VOBU; Address acquisition means for reading the DSI data contained in the VOBU and acquiring a search destination address of the VOBU including the data for reproduction to be reproduced next by the reproduction control means; and when the address acquisition means cannot read the DSI data A disk reproducing apparatus, comprising: an address setting means for skipping a VOBU including the DSI data and setting a search destination address of the VOBU including the reproduction data based on the previously obtained DSI data. . 2. The address setting means sets a next search destination address next to a VOBU including DSI data obtained last time as a search destination address of a VOBU including reproduction data. 2. The disk reproducing device according to 1. 3. An error recognizing means for recognizing an error when the search destination address set by the address setting means exceeds a search destination address of a VOBU located at the end of the content data. 3. The disk reproducing apparatus according to claim 2, wherein: 4. A disc reproducing method for reproducing content data recorded on an optical disc and composed of a plurality of VOBUs, a reproducing control step of sequentially reading and reproducing reproduction data such as video and audio contained in the VOBU, An address obtaining step of reading the DSI data included in the VOBU and obtaining a search destination address of the VOBU including the reproduction data to be reproduced next time, and, if the DSI data cannot be read in the address obtaining step, the DSI data Skip the VOBU containing
An address setting step of setting a search destination address of a VOBU including reproduction data based on previously obtained DSI data.