JP3619743B2 - Optical disk playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc playback apparatus.
[0002]
[Prior art]
An optical disc playback device has been developed that reads a bit stream from a recording medium on which a bit stream consisting of compressed video and audio signals is recorded, decodes the read bit stream into the original video symbols and audio signals, and performs playback. This is well known. There is a DVD player as one of optical disk reproducing apparatuses.
[0003]
Here, a case will be described in which a selection screen is displayed during reproduction and software that progresses in a format in which content displayed by a user's selection operation is selected is reproduced.
[0004]
In the following description, PGC is an abbreviation for Program Chain, and refers to a logical unit that reproduces all or part of a title or menu. The PGC is composed of PGC information (PGCI) in which the reproduction order and substance are described, and one or more cells (Cell) to be reproduced.
[0005]
Here, the cell means a basic unit of content to be reproduced. One cell can be used in different PGCs in one VTS (Video Title Set). A cell must consist of an integer number of video object units (VOBU). The PGC has a list for designating cells in the order of playback.
[0006]
It is assumed that the reproduction is started when the user inputs a disk reproduction command, and the user performs selection on the selection screens 1, 2, and 3 displayed during the reproduction as shown in FIG.
[0007]
That is, when playback is started and playback is performed according to PGC1, the selection screen 1 is displayed. When the user selects select2, PGC2 is reproduced according to the jump address. When the selection screen 2 is displayed and the user selects select 2, the PGC 3 is reproduced according to the jump destination address.
[0008]
When the selection screen 3 is displayed and the user selects select1, it is assumed that the PGC 4 is reproduced according to the jump destination address, and the reproduction is stopped during the PGC reproduction.
[0009]
FIG. 4 is a schematic diagram of a PGC (program chain) in the recording position information recorded on the DVD disc.
[0010]
As described above, the PGC is composed of PGC information (PGCI) in which the reproduction order and substance are described, and one or more cells (Cell) to be reproduced. PGCI is a PRE_CMD (Pre_Command), a playback order of 128 CELLs (not shown), CELL address information and playback control information (not shown), and a CELL command (shown) that is executed at the end of CELL playback. Abbreviation) and PPOST_CMD (Post_Command). PRE_CMD is NV_CMD (Navigation Command) that is executed before the PGC is played back by the player. POST_CMD is NV_CMD that is executed after the PGC is played by the player.
[0011]
When reproducing the DVD disc, the transition to another PGC is repeated according to the navigation information of the PGC. That is, reproduction is realized by connecting PGCs.
[0012]
The destination address for each selection screen and the selected item is prepared for any of the PELL CELL commands or the destination indicated by the POST command.
[0013]
However, in the prior art, in order to reproduce PGC4 again after stopping the reproduction of PGC4 once as described above, it is necessary to perform normal reproduction and perform the above procedure again, which is very troublesome. .
[0014]
However, if you remember the address where you stopped playing and try to play it back from the address you remembered, you will be prohibited due to disk limitations or will not work properly.
[0015]
[Problems to be solved by the invention]
An object of the present invention is to provide an optical disk reproducing apparatus that can quickly reach a place where reproduction is stopped.
[0016]
[Means for Solving the Problems]
The optical disk reproducing apparatus according to the present invention sequentially stores the head address of the CELL including the selection screen and the selection contents selected by the user on the selection screen as selection history data during reproduction, and the selection history data Accordingly, when a special reproduction command for reproduction is input, only the head address of CELL and the jump address of CELL to be reproduced next are sequentially read from the recorded information, and the head address of the read CELL is When the head address in the selection history data stored in the storage means matches, the selection screen is displayed by normal reproduction of the CELL, and the selection history data stored in the storage means When the next jump destination address is obtained based on the selection corresponding to the selection screen Repeats the processing in Tsu, when executing all the processing corresponding to all of the selection history data stored in the storage means, characterized in that it comprises a means for normal reproduction from the end of the jump address.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the configuration of a DVD player.
[0018]
In FIG. 1, reference numeral 1 denotes a drive unit that reads information from a disk. A demultiplexer 2 analyzes and separates the bit stream sent from the drive unit 1.
[0019]
The audio information separated by the demultiplexer 2 is decoded by the audio decoder 3 and output as audio. The video information separated by the demultiplexer 2 is decoded into video information and sub-picture information by the video decoder 4 and transmitted to the video mixer 9.
[0020]
In the video mixer 9, the video information and sub-picture information sent from the video decoder 4 and the graphic information sent from the on-screen generator 8 are mixed and output as a video.
[0021]
The CPU 6 receives header information from the demultiplexer 2, a playback method change instruction by a key operation, and the like via the user interface unit 5. The CPU 6 performs control of the drive unit 1, writing of information to the memory 7, reading of information from the memory 7, etc. according to these input information.
[0022]
After the user gives an instruction to store the selection history data in the reproduction process by key operation, the reproduction is started when the user inputs a disk reproduction command, and the selection displayed during reproduction as shown in FIG. It is assumed that the user has made a predetermined selection on each of screens 1, 2, and 3.
[0023]
That is, when playback is started and playback is performed according to PGC1, the selection screen 1 is displayed. When the user selects select2, PGC2 is reproduced according to the jump address. When the selection screen 2 is displayed and the user selects select 2, the PGC 3 is reproduced according to the jump destination address. When the selection screen 3 is displayed and the user selects select1, it is assumed that the PGC 4 is reproduced according to the jump destination address, and the reproduction is stopped during the PGC reproduction.
[0024]
FIG. 3 shows the PGC reproduced during the reproduction.
[0025]
During the reproduction, the CPU 6 stores selection history data. That is, when the selection screen 1 is displayed by the CELL 46 in the PGC 1 during the PGC 1 reproduction and the select 2 is selected by the user, the selection address corresponding to the first PGC is selected from the start address of the CELL 46 and the selection 2 select 2. Stored in the memory 7 as data.
[0026]
Next, during playback of PGC2, when the selection screen 2 is displayed on the CELL 56 in the PGC 2 and the select 2 is selected by the user, the selection address corresponding to the second PGC is selected from the top address of the CELL 56 and the selection 2 Stored in the memory 7 as data.
[0027]
Further, during the PGC3 playback, when the selection screen is generated in the CELL 66 in the PGC 3 and the select 1 is selected by the user, the start address of the CELL 66 and the selection content select 1 are selected as selection history data corresponding to the third PGC. Store in the memory 7.
[0028]
After this, when the user inputs a special playback command so that playback is performed according to the procedure according to the selection history data, the demultiplexer 2 follows the CELL playback order described in PGCI in PGC1. And the CELL command in PGCI are transmitted to the CPU 6. The CPU 6 collates the head address of the CELL in the PGC 1 sent from the demultiplexer 2 with the head address of the CELL in the selection history data corresponding to the first PGC stored in the memory 7 and matches. If not, the CELL command sent from the demultiplexer 2 is processed and the process proceeds to the next CELL.
[0029]
In this way, the head address of the CELL and the CELL command are transmitted from the demultiplexer 2 to the CPU 6 and the address match determination by the CPU 6 is repeated.
[0030]
When the head address of the CELL in the PGC 1 sent from the demultiplexer 2 matches the head address of the CELL in the selection history data corresponding to the first PGC stored in the memory 7 (in this example, When the head address of the CELL 46 in the PGC 1 is sent to the CPU 6, the head address of the CELL stored in the memory 7 matches), and the CPU 6 instructs the demultiplexer 2 to normally play back the CELL 46. To do. As a result, the CELL 46 is normally reproduced and a selection screen is displayed.
[0031]
When the selection screen is displayed, the process shifts to PGC 2 according to the selection content select 2 in the selection history data corresponding to the first PGC stored in the memory 7.
[0032]
Even in the case of shifting to PGC2, as in the case of PGC1, the demultiplexer 2 performs only the operation of transmitting the CELL head address and the CELL command to the CPU 6. The CPU 6 collates the head address of the CELL with the head address of the CELL in the selection history data corresponding to the second PGC stored in the memory 7, and if they do not match, the CELL sent from the demultiplexer 2 The demultiplexer 2 is instructed to proceed to the next CELL indicated by the command.
[0033]
When the start address of the CELL 56 in the PGC 2 is sent to the CPU 6, when the start address of the CELL in the selection history data corresponding to the second PGC stored in the memory 7 matches, the CELL 56 is normally reproduced. The selection screen is displayed. When the selection screen is displayed, the process shifts to PGC 3 according to the selection content select 2 in the selection history data corresponding to the second PGC stored in the memory 7.
[0034]
Similarly, when shifting to PGC3, the demultiplexer 2 performs only the operation of sending the head address of the CELL and the CELL command to the CPU 6. The CPU 6 collates the head address of the CELL with the head address of the CELL in the selection history data corresponding to the third PGC stored in the memory 7, and if they do not match, the CELL sent from the demultiplexer 2 The demultiplexer 2 is instructed to proceed to the next CELL indicated by the command.
[0035]
When the start address of the CELL 66 in the PGC 3 is sent to the CPU 6 and the start address of the CELL in the selection history data corresponding to the third PGC stored in the memory 7 matches, the CELL 66 is normally reproduced. The selection screen is displayed. When the selection screen is displayed, the process proceeds to PGC 4 according to the selection content select 1 in the selection history data corresponding to the third PGC stored in the memory 7.
[0036]
When the process shifts to PGC4, normal selection is performed because there is no selection history data corresponding to the fourth PGC.
[0037]
In the above embodiment, the case where there is always a selection screen in each PGC has been described as an example. However, in the present invention, when a selection screen is displayed after a plurality of PGCs are reproduced, the address indicated by the POST command is displayed. This can also be applied to cases where there is a selection screen.
[0038]
【The invention's effect】
According to the present invention, it is possible to obtain an optical disc reproducing apparatus that can quickly reach a place where reproduction is stopped.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a DVD player.
FIG. 2 is a schematic diagram illustrating a selection operation performed by a user during a reproduction operation and a reproduction process.
3 is a schematic diagram showing a PGC reproduced during the reproducing operation of FIG. 2; FIG.
FIG. 4 is a schematic diagram showing a configuration of a PGC (program chain).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive part 2 Demultiplexer 3 Audio decoder 4 Video decoder 5 User interface part 6 CPU
7 Memory 8 On-screen generator 9 Video mixer

Claims (1)

During playback, means for sequentially storing the head address of the CELL including the selection screen and the selection content selected by the user on the selection screen as selection history data, and a special for performing playback according to the selection history data When a playback command is input, only the head address of the CELL and the jump address of the next CELL to be played back are sequentially read from the recorded information, and the head address of the read CELL is stored in the storage means. If the head address in the selection history data matches, the selection screen is displayed by normal reproduction of the CELL, and the selection content corresponding to the selection screen in the selection history data stored in the storage means is displayed. Based on this, it repeats the process of acquiring the next destination address, All the time you run all the processing corresponding to the selected history data, means for performing a normal playback from the last jump address being 憶,
An optical disc playback apparatus comprising:

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