JP4875459B2 - Menu data access method and optical disc playback apparatus - Google Patents

Description

  The present invention relates to an optical disc reproduction technique, and more particularly, to a method for accessing menu data recorded on an optical disc.

  A DVD (Digital Versatile Disc), which is one of optical discs, stores menu data as well as video / audio data. In the menu data, a start code indicating the head of the data, a data length, and the like are written. For this reason, by referring to the start code and data length of the menu data, it is possible to quickly perform processing corresponding to the display of the menu screen and the user's operation.

On the other hand, with respect to data other than menu data, it is possible to randomly access desired data by referring to a table recorded on the optical disc (see, for example, Patent Document 1).
JP 2002-298552 A

  In an optical disc compliant with a standard such as BD (Blu-ray Disc) that has recently appeared, no start code or data length is recorded in the menu data. Therefore, in BD, menu data is read by sequential access. For this reason, it takes time to perform a predetermined operation when a menu screen is displayed or a certain button is selected.

  In view of the above problems, an object of the present invention is to realize quick access to menu data recorded on an optical disc and sequentially accessed.

  Means taken by the present invention to solve the above-mentioned problems are button information data recorded on an optical disc and assigned a predetermined operation, button group information data including one or more button information data, and button group information data. As a method of accessing menu data that includes three attribute data of page information data including one or more of them, and is sequentially accessed, each data included in the menu data, its attributes, and A first step for identifying an ID, a second step for calculating an offset of the data identified in the first step for at least one of the three attributes, and an offset calculated in the second step In a table for each data attribute, and Referring to Le, and that a fourth step of accessing the menu data.

  According to this, by creating a table for each data attribute in which the offset of each data included in the menu data is stored and referring to the table, pseudo random access to the menu data can be performed. Therefore, desired data in the menu data can be quickly accessed.

  Preferably, in the third step, the ID identified in the first step is recorded in the table together with the offset calculated in the second step. According to this, even if each data included in the menu data is not arranged in the ID order, the offset corresponding to the ID can be referred to.

  Preferably, in the third step, the offset calculated in the second step is recorded in order from the top of the table, or is recorded at a table address uniquely determined by the ID identified in the first step. Is done. According to this, the table size can be reduced.

  Preferably, in the third step, the table offset of the lower attribute data is recorded in the upper attribute data table. According to this, the table can have a hierarchical structure similar to the menu data, and can be accessed more quickly by the data of the lower attribute.

  Preferably, in the second step, it is determined which offset of the data of the three attributes is to be calculated based on the capacity of the memory storing the table. According to this, since the table corresponding to the memory capacity is generated, the memory can be used efficiently.

  Preferably, in the third step, the offset calculated in the second step is thinned and recorded. According to this, it is possible to reduce the size of the generated table.

  More preferably, in the third step, the offset calculated in the second step is thinned out based on the capacity of the memory in which the table is stored.

  Specifically, in the third step, the offset of the data of each attribute is thinned at the same interval or at an interval set individually.

  The means provided by the present invention includes three attributes: button information data to which a predetermined operation is assigned, button group information data including one or more button information data, and page information data including one or more button group information data. As a playback device for an optical disc on which menu data that is sequentially accessed is recorded, the menu data is accessed sequentially, each data included in the menu data, its attribute and ID are identified, and three attributes With respect to at least one of these, the offset of the identified data is calculated, the table generation unit that records the calculated offset in a table for each data attribute, and the table generated by the table generation unit, Menu data access to access menu data And that a part.

  According to this, by creating a table for each data attribute in which the offset of each data included in the menu data is stored and referring to the table, pseudo random access to the menu data can be performed. Therefore, desired data in the menu data can be quickly accessed.

  As described above, according to the present invention, menu data recorded on an optical disk such as a BD and sequentially accessed can be quickly accessed.

  Prior to the description of the embodiment of the present invention, the structure of the menu data of the optical disc standard assumed by the present invention will be described. FIG. 1 shows the structure of the menu data. The menu data 20 includes one or more page information data related to the background of the menu screen (menu page). Each page information data includes one or more button group information data related to the menu button. Each button group information data includes one or more button information data indicating predetermined operation contents to be executed when a menu button displayed on the menu screen is selected. As described above, the menu data 20 has a three-layer structure. Each data has a variable length, and no start code and data length are recorded.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 2 shows a configuration of an optical disk reproducing apparatus according to the present invention. The optical disc playback apparatus 1 includes a table generation unit 101 and a menu data access unit 102. The menu data 20 is read from an optical disc (not shown) and stored in a memory 100 provided inside or outside the optical disc playback apparatus 1.

  The table generation unit 101 includes, from the menu data 20, a page information table 30a for accessing page information data, a button group information table 30b for accessing button group information data, and a button information table for accessing button information data. 30c is generated and these tables are stored in the memory 100. The tables 30 a to 30 c may be stored in a memory different from the menu data 20.

  FIG. 3 shows the generated tables 30a to 30c. The tables 30a to 30c are generated as follows. First, the data 21 recorded at the head of the menu data 20 is identified, and it is identified that it is page information data and its ID is 0. Then, for data 21, an offset OF1 from the top of the menu data is calculated. The ID and offset are recorded at the top of the information table 30a.

  Next, data 211 is identified, and it is identified that it is button group information data and its ID is 0. For the data 211, the offset OF3 from the head of the data 21 is calculated. The ID and offset are recorded in the head part of the button group information table 30b. In addition, a table offset indicating a storage position of information related to the data 211 in the table 30b is recorded in the table 30a.

  Subsequently, the data 211a is identified, and it is identified that it is button information data and its ID is 0. Then, for the data 211a, an offset OF5 from the head of the data 211 is calculated. The ID and offset are recorded in the head part of the button information table 30c. In addition, a table offset indicating a storage position of information related to the data 211a in the table 30c is recorded in the table 30b. Thereafter, in the same manner as described above, the ID and offset of each data are recorded in the table corresponding to the data attribute, and the table shown in FIG. 3 is completed.

  The ID and offset may be thinned out at a predetermined interval (table storage thinning number) and recorded in the table. The table storage thinning number may be set by the user, or may be set by the table generation unit 101 based on the capacity of the memory 100 and the sizes of the tables 30a to 30c. Further, it may be common to all tables, or may be set individually for each table. In any case, the table size can be reduced by thinning the offset.

  Alternatively, a table address corresponding to the ID may be set in advance, and the offset may be recorded at the table address corresponding to the data ID. When each data in the menu data 20 has a continuous ID for each attribute, the storage location of each offset in the table can be specified without recording the ID, so only the amount of the ID is omitted. The table size can be kept small. Further, only the offset may be recorded in order from the top of the table. When the data in the menu data 20 are arranged in the order of consecutive IDs for each attribute, the table size can be reduced for the same reason as described above.

  On the other hand, the menu data access unit 102 accesses desired data in the menu data 20 with reference to the tables 30a to 30c. For example, when accessing the page information data 21 (ID = 0), the menu data access unit 102 refers to the table 30a and reads data recorded at a position shifted from the top of the menu data 20 by the offset OF1. . As for other data, the data recorded at the position shifted by the offset corresponding to the ID of the requested data is read by referring to the table as appropriate.

  If there is no information about the data to be accessed in the table because the information in the table is thinned out, it is possible to access the neighboring data by referring to the table and read out the desired data from there by sequential access. That's fine. When each data in the menu data is arranged in the ID order, the access time can be shortened.

  As described above, according to the present embodiment, pseudo-random access such as recording the ID and offset of each data in the menu data for each data attribute in the table and accessing the menu data with reference to the table becomes possible. As a result, when a user requests menu display or menu processing, the user can quickly respond to the request.

  Note that the table generation unit 101 may generate only a table of attributes designated by the user. For example, by generating only the page information data table, it is possible to quickly access the desired page information data while suppressing the required memory amount, so that the access time to the desired data becomes much faster.

  In addition, the table generation unit 101 may determine which attribute table to generate based on the capacity of the memory 100 and the sizes of the tables 30a to 30c. In this case, it is only necessary to calculate the offset of the corresponding attribute instead of calculating the offset of all the attributes. When only one table is generated, the offset from the top of the menu data may be calculated as the data offset, and the offset of the lower attribute table is unnecessary.

  The optical disk playback apparatus according to the present invention is useful as a BD-ROM playback apparatus because it can perform pseudo-random access to menu data.

It is a figure which shows the structure of menu data. It is a figure which shows the structure of the optical disk reproducing device based on this invention. It is a figure which shows a table structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk reproducing | regenerating apparatus 101 Table production | generation part 102 Menu data access part

Claims (11)

Data of three attributes: button information data recorded on an optical disc and assigned a predetermined operation, button group information data including one or more button information data, and page information data including one or more button group information data. A method for accessing menu data that includes sequential access.
A first step of sequentially accessing the menu data to identify each data included in the menu data and its attribute and ID;
For at least one of the three attributes, as the offset of the data identified in the first step, in the case of the page information data, the offset from the top of the menu data is used as the offset of the button group information data. A second step of calculating an offset from the top of the page information data in the case, and an offset from the top of the button group information data in the case of the button information data ;
A third step of recording the offset calculated in the second step in a table for each data attribute stored in the memory ;
And a fourth step of accessing the menu data with reference to the table. In the menu data access method according to claim 1,
In the third step, the menu data access method is characterized in that the ID identified in the first step is recorded in the table together with the offset calculated in the second step. In the menu data access method according to claim 1,
In the third step, the offset calculated in the second step is recorded in order from the top of the table. In the menu data access method according to claim 1,
In the third step, the offset calculated in the second step is recorded at a table address uniquely determined by the ID identified in the first step. . In the menu data access method according to claim 1,
In the third step, a menu data access method is characterized in that a table offset of lower attribute data is recorded in a table of upper attribute data. In the menu data access method according to claim 1,
In the second step, it is determined which offset of the data of the three attributes is to be calculated based on the capacity of the memory . In the menu data access method according to claim 1,
In the third step, the offset calculated in the second step is thinned out and recorded. In the menu data access method according to claim 7,
In the third step, the offset calculated in the second step is thinned out based on the capacity of the memory . In the menu data access method according to claim 7,
In the third step, the offset of data of each attribute is thinned out at the same interval. In the menu data access method according to claim 7,
In the third step, the menu data access method is characterized in that the offset of data of each attribute is thinned out at intervals set individually. Sequential access is performed including data of three attributes: button information data to which a predetermined operation is assigned, button group information data including one or more button information data, and page information data including one or more button group information data. An apparatus for reproducing an optical disc on which menu data is recorded,
Sequentially accessing the menu data to identify each data and its attribute and ID included in the menu data, and for at least one of the three attributes , the page as an offset of the identified data In the case of information data, the offset from the top of the menu data, in the case of button group information data, the offset from the top of the page information data, and in the case of button information data, the offset of the button group information data. A table generation unit that calculates an offset from the top and records the calculated offset in a table for each data attribute stored in a memory provided inside or outside the optical disc playback apparatus ;
An optical disk reproducing apparatus comprising: a menu data access unit that accesses the menu data with reference to the table generated by the table generation unit.

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