JP2003514335A - Record carrier, apparatus for reproducing record carrier, method for reproducing record carrier, apparatus for recording record carrier, and method for recording record carrier - Google Patents

Abstract

(57) Abstract: A record carrier (1) according to the present invention comprises audiovisual data (11) and playback control data (12) which controls the playback of the audiovisual data on a playback device while enabling user interaction. ) Has information organized into a plurality of files, including: The information further includes priority information (priority) indicating the relative priority at which the file should be stored in the cache memory (39) of the playback device. The invention also relates to an apparatus for reproducing a record carrier and a method for reproducing a record carrier.

Description

Detailed Description of the Invention

[0001]

【Technical field】

  The present invention relates to record carriers.

[0002]   The invention also relates to a device for reproducing a record carrier.

[0003]   The invention further relates to a method of reproducing the record carrier.

[0004]

[Background technology]

Several standards have been developed for digital storage and reproduction of audiovisual data, such as the SVCD and DVD standards. SVCD describes the storage of audiovisual data in the form of MPEG2 files, which can be played under the control of a so-called Play Sequence Descriptor (PSD). The audiovisual data and PSD are stored on a record carrier. PSD is a group of control structures that allow the playback of pre-programmed sequences with user selection and interaction. The user selection can be performed, for example, by a menu displayed on the display device, and the user can select an item by pointing the position of the display device from the menu with a pointing device such as a mouse. Reading such a menu from a record carrier is
It can slow down the interaction speed.

[0005]

DISCLOSURE OF THE INVENTION

It is an object of the invention to provide a record carrier, an apparatus for reproducing audiovisual data from the record carrier and a method for reproducing audiovisual data from such a record carrier, which enables a faster interaction speed.

For the above purpose, the record carrier of the invention comprises audiovisual data and reproduction control data for controlling the reproduction of the audiovisual data on a reproduction device while enabling user interaction. It has information organized into a plurality of files, which information also has priority information indicating the relative priority with which the file should be stored in the cache memory of the playback device.

The record carrier according to the invention is particularly suitable for reproduction on a reproduction device according to the invention. A reproducing apparatus according to the present invention comprises a reading means for reading the above data from a record carrier, a cache memory for storing the data from the record carrier, a user input means for inputting a user input, and a control means for processing the control data. And reproducing means for reproducing the audiovisual data, and the apparatus is configured to read the priority information and store the file in the cache memory at the priority determined by the priority information.

[0008] Preferably, the priority information (priority) relates to an estimated frequency with which the data is accessed. The priority information enables the playback device to store frequently accessed control data in the device's cache memory and to keep files that are accessed less frequently on the record carrier. Such control data has, for example, a menu item. This type of data is often used to request information from the user on how to proceed with the playback. It takes 1-2 seconds to load such menu items from the record carrier, which disturbs the speed of interaction between the playback device and the user. By providing said priority information on the record carrier, the playback device according to the invention makes it possible to store this kind of data in a cache memory and thus improve the speed of interaction. Since the priority information indicates what information is most related to the storage in the cache memory, the cache memory can be made relatively small. The priority information preferably distinguishes between at least eight levels. This allows a player having a relatively small cache memory to choose to store only the most frequently accessed files in it. On the other hand, if such a record carrier is played on a playback device with a larger cache memory, in addition to these files, other files that are accessed less frequently but still important are stored in the cache memory. be able to.

Each item of priority information can be attached to a file to which the item corresponds. However, preferably, the priority information is included in a single file. This allows the playback device to retrieve the priority information with one file access.

An attractive embodiment of the playback device according to the invention is characterized in that it comprises means for rewriting the priority information on the record carrier according to the frequency with which the file is actually accessed by the user. This configuration allows the playback device to adapt the record carrier to the profile of a particular user.

The present invention also provides a record carrier having information organized into a plurality of files including audiovisual data and reproduction control data for controlling reproduction of the audiovisual data while enabling user interaction. Is a method of playing
The method comprises: a. Determining if the cache memory has sufficient unoccupied space, and aa. Determining that the cache memory does not have sufficient unoccupied space. A step of determining whether the cache memory has a sufficiently large space occupied by one or more other data files having a priority value lower than the priority value of the first data file, aaa. Overwriting the one or more other data files with the first data file if step aa is true.

The preferred embodiment of the above method comprises: a. If the result of step a is true, ab. Determining whether the first data file has a priority value higher than a predetermined value; aba. If the result is true, the first data file is loaded from the record carrier into the cache memory.

The advantage of this embodiment is that it prevents files with a too low priority from being loaded into the cache memory. Such files will typically only stay in cache memory for a relatively short time as they are overwritten by files with higher priority.

The cache memory of the reproducing device according to the invention is also loaded during the initialization phase of the device by the following method of reproducing the record carrier. That is, the above method
A method of reproducing a record carrier having information organized into a plurality of files including audiovisual data and reproduction control data for controlling reproduction of the audiovisual data while enabling user interaction, d. . Setting a reference priority value; e. Determining, for multiple files, the priority value assigned to the file is higher than the reference priority value; ea. The result of step e is true Determining whether the cache memory has sufficient space to store the unit of data, eaa. Loading the unit of data into the space if the result of step ea is true. G. Decreasing the reference priority value, g. Determining whether the reference priority value is greater than or equal to the base priority value, ga. If the result of step g is true, repeating steps d through g.

The record carrier according to the invention is organized in a plurality of files containing audiovisual data and playback control data which controls the playback of the audiovisual data on the playback device while allowing user interaction. Can be recorded by a device for recording a record carrier such as, the information further comprising priority information indicating the relative priority that the file should be stored in the cache memory of the reproducing device,
The recording device has: -means for obtaining the audiovisual data, -means for creating the control data, -priority determining means for determining the priority information, -the audiovisual data and the control data in a file. Formatting means for formatting, and-recording means for recording the priority information, audiovisual data and control data on the record carrier.

The record carrier according to the invention is also organized into a plurality of files containing audiovisual data and reproduction control data for controlling the reproduction of the audiovisual data on the reproduction device while allowing user interaction. Can be recorded by a method of recording a record carrier having such information, said information further comprising priority information indicating the relative priority that the file should be stored in the cache memory of the playback device, A method comprising: -obtaining the audiovisual data, -creating the control data, -determining the priority information, -formatting the audiovisual data and the control data into a file, -The above priority information, audiovisual data and control data And a step of storing in the record carrier.

The reproduction control program can be recorded together with the audiovisual data on the same information carrier, but otherwise it can be recorded on another record carrier or in the ROM of the reproduction device.
It can also be stored in.

These and other features of the present invention will be described with reference to the drawings and in the appendix “Draft Specification for Video Disc Playback Control Program (PCP)” (herein incorporated by reference). Will be described in detail with reference to.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

1 shows a record carrier 1, which comprises audiovisual data 11,
It has information organized into a plurality of files 2 including reproduction control data 12 for interactively controlling reproduction of the audiovisual data 11 on the reproduction device. The reproduction control data on the one hand controls the reproduction of the audiovisual data and, on the other hand, enables the user interaction, for example by providing options that the user can select. In the embodiment disclosed herein, the file has a file structure as described in Section 3 of the Appendix. Part of the file structure is a file header (File_header) including a file identifier (File_ID). In one embodiment, the audiovisual data may be included in one or more of the following four types of MPEG files: The first type is an MPEG movie file (File_ID = 10). This type of file includes a video stream, one or more audio streams, and a private stream. The second type of file is an MPEG audio file (
File_ID = 11). This type of file contains one or more audio streams but no video streams. The third type of file is an MPEG image file (File_ID = 12). The file contains a video stream with one or more still images, but no audio stream. The fourth type MPEG file (File_ID = 13) is a so-called MPEG show file and has a video stream accompanied by one or more still images and one or more audio streams. Furthermore, the audiovisual data is a JPEG image file (File_ID = 20) and BM in the figure.
It may have a bitmap image file (File_ID = 21) indicated as P.
The reproduction control data 12 is one or more so-called reproduction control program files (PCP, File_ID
= 3), the file can include a PCP file for startup. Each PCP file can include one or more functional blocks FB. One FB contains one or more commands CMD1, as described in Section 4.5 of the Appendix.
..., including CMDn. Further, the reproduction control data has a reproduction item table file (PIT file, File_ID = 2). The structure of the PCP file is described in detail in Section 3.2 of the Appendix, and the PIT file is described in Section 3.3 of the Appendix. In addition, the record carrier has a file record table file (FRT file, File_ID = 1) as described in Section 3.1 of the Appendix. The FRT file has information about all files on the record carrier 1, such as size and address on the record carrier, and general information about the record carrier. The record carrier is preferably a randomly accessible medium such as a disc or card as described in the Appendix. The medium is, for example, an optical, magnetic or magneto-optical medium. The above information on the record carrier 1 is further stored in the file 2
Has priority information indicating the relative priority to be stored in the cache memory of the playback device.

In the described embodiment, the priority information is contained in a single file, in this case an FRT file. FRT including itself for each of File 2
The file has an entry called "Priority" which has a value in the range 0-15. The priority information relates to the estimated frequency with which the data is accessed. A value with a high priority represents a high estimated frequency. In the described embodiment, the control data is contained in one or more control programs, or PCP files, which have references to menus, for example in the form of MPEG image files. Preferably, these files have a high priority, preferably the highest value (1
5).

FIG. 2 shows a reproducing device according to the invention for reproducing the record carrier 1 described above with reference to FIG. The reproducing device has a reading means 20 for reading data from the record carrier 1. The reading means 20 includes a processing means 3 for processing the control data.
There is provided a control means 21 for controlling the reading of data from the record carrier 1 in response to a 0 command. The data read from the record carrier 1 is transmitted via the bus 15. The device further comprises a cache memory 39 for storing the data from the record carrier 1. Furthermore, the device comprises a processing memory 31 for storing the data used by the processing means 30. The device also has user input means 40, 41 allowing user interaction. The user input means is, for example, a pointing device such as a keyboard or a mouse. The processing means 30 interactively select audiovisual data from the record carrier 1 and reproduce these data by audio reproduction means 53, 54 having an MPEG audio decoder 53 and video reproduction means 51, 52 having an MPEG video decoder 51. Let The device according to the invention is arranged to read the priority information and to store the file in the cache memory 39 on the basis of this priority information. To this end, the device reads the priority information from the FRT file, and if the cache memory 39 is too small to store all files, the device stores the file with the highest priority value in the cache memory 39. Remember. Processing means 3
0 is a command CM in the functional block FB of the reproduction control program file PCP
It has an interpreter means 32 for interpreting D1, ... The interpreter 32 sequentially interprets the above commands and writes / reads a plurality of player API registers, also denoted as Registers, which function as an application programmer interface. These registers and the function of these registers are
It is described in Section 4.3.2 of the Appendix. For example, up to 16 hotspots can be defined by writing to registers 128-191. Next P
The CP file can be selected by writing its file number in the 226th register. A play item (play_item), for example, an MPEG file, can be selected by writing the identifier of the item in the register 228. It should be noted that most registers correspond to separate registers for writing and reading. By reading the register, the execution means 3
It is possible to capture the status information returned by the above-mentioned 4. For example, when the 228th register is read, a so-called reproduction event ID value can be fetched. The latter indicates the reason why the reproduction of the MPEG file has ended. A more detailed description is given in Section 4.4.6 of the Appendix. The interpreting means and the executing means of the above processing means can be incorporated in the form of software in a single processor or can be configured as different processors. The interrelationship of the different files is shown in FIG. When the file number of the PCP file is written in the register 226, the execution means 34 fetches the file address of the PCP file from the FRT file. If this file is not yet available in the cache memory 39, it is loaded from the record carrier 1 into the processing memory 31. When the reproduction control program file writes the reproduction item identifier in the register 228, control is passed to the execution means 34. The means looks up the corresponding file number of the audiovisual file and the entry point of the file in the play item table PIT, and plays the play item. The file address of the audiovisual file is retrieved from its file number by the FRT file. When control is passed to the executing means 34, the operation of the interpreting means 32 is suspended until an event is detected by the event handler means 35. The event handler means 35
Detecting at least one of the following events: time lapse, user input, trigger data occurrence in audiovisual data. This is shown in Figure 1 of the Appendix. The timer setting command (set Timer) by writing a value to the register 252 has an effect that a timer event is generated when the timer 35 starts subtraction counting from the above value and the subtraction counting is completed. . The trigger event is the trigger mask 37 (trigger mask 37 loaded in the register 249).
This occurs when it is detected that the trigger data (trigger_data) corresponding to (trigger_mask) has occurred in the MPEG stream read from the currently selected file. The user can trigger the event in several ways. First, one or more hotspots can be defined by writing to selected ones or all of registers 128-191. When the user points to the hotspot, a hotspot event occurs. Otherwise, when a key enabled by the user key mask (userkey_mask) is pressed, a user key event occurs. The latter is assigned to register 250. Even when the reproduction of the MPEG file is completed, an event of an end of file (End_of_File) event similarly occurs. When an event occurs, the event handler 35
Enables the interpreter means 32 to continue the interpretation from the command (command # n + 1) following the command (#n) in which the operation of the interpreter means 32 is temporarily stopped.

When the file is accessed, the procedure shown in FIG. 3 is performed. First, step S
At 1, it is checked if the file to be accessed is already in the cache memory 39. If so, the file is copied from the cache memory 39 to the processing memory 31 in step S2. The file can then be processed in step S3. If the file to be accessed does not exist in the cache memory 39, the file is loaded from the record carrier 1 into the processing memory 31 in step S4. Next, in step S5, it is checked whether or not the cache memory 39 has sufficient free space to store the file. If the result is positive, the file is stored in the processing memory 31 in step S7.
From the cache memory 39 to the empty space. If the result of the step S5 is negative, the program step S6 is executed. In this step, it is checked whether there is sufficient space in the cache memory 39 such that it is occupied by a file having a lower priority than the accessed file. If so, the file is transferred from the processing memory 31 to the cache memory 39.
Is copied to the above space (step S7). In other cases, the above file is not copied to the cache memory 39.

An embodiment of the device according to the invention also comprises a procedure for loading the cache memory 39 during initialization. Such a procedure will be described with reference to FIG. In the first program step S10, the priority reference value PR is initialized to 15. Second
In program step S11, the file number I is initialized to 1. Next, in step S12, it is checked whether the file of file number I has a priority equal to PR. Otherwise, the procedure proceeds to step S15. Otherwise, the procedure is continued in step S13, in which it is checked whether the size of the file with the file number I is less than or equal to the free space in the cache memory 39. If this is true, the file is loaded into the cache memory 39 in step S14. If not, the procedure continues at step S15, where the file number is incremented by 1. Then, in step S16, it is checked whether the file number is less than or equal to the total number of files. If this is true, the procedure continues at step S12. If not, the priority reference value is decremented by 1 in step S17. Then, in step S18, it is checked whether or not this new priority reference value is 0 or more. If this is true, the procedure continues at step S11. If false, the procedure ends.

It should be noted that the scope of protection of the present invention is not limited to the embodiments described here. For example, an embodiment of the device according to the invention is described as having detection means for detecting what type of record carrier is present, but other embodiments allow the user to supply such information. It has an input means that enables it. In addition to the reading means, the device may comprise recording means for recording the information stream on a record carrier. Further, the scope of protection should not be limited by the reference signs included in the claims. Also, the term "comprising" does not exclude other parts than those listed in a claim. In addition, singular elements do not exclude a plurality of such elements. Furthermore, the invention resides in each novel feature and combination of features.

[0025]   Appendix Specification draft of video disc playback control program (PCP) Eric Shaylanda Revision 3, November 1999, 11:43

The reproduction control program (PCP) is used for user navigation when reproducing a disc. The user can select a portion to be reproduced from the presented menu. Any 2K sector addressable medium, eg CD-ROM
It is also applicable to a DVD-ROM.

In the current VCD and SVCD specifications, Play Order Descriptor (PSD) is used for fixed syntax and semantic PCP. This has the disadvantage of being static (predetermined) and not adapted to user input. Conditional judgment or calculation is not supported. Playback is programmed with recorded playlists and selection lists that define playing MPEG streams. In SVCD, an extension called command list was introduced, which allowed conditional decision and some limited computation.

The present proposal is based on roughly the same idea, but without the use of playlists or selection lists. This proposal also supports event processing triggered by MPEG stream playback points, timers or user input.

Again, the control and navigation data is stored in the MPEG stream,
It is very different from DVD, which makes authoring and judgment very complicated. Revision History Revision # 1d, 1999/10/26

The NVRAM size was assigned by Disc_info and corrected to the location of Reg [0]. Typing errors have been corrected, Figure 1 updated, and summary changed.
Revision # 2a, 1999/10/27

Player registers were simplified and register numbers were reallocated to avoid MSB, LSB bytes (hotspots, ODT, Audio_stream). Added JPEG and BMP file format values. As an extension, we added OGT rendering in the hotspot area. Revision # 2b, 1999/11/1

The names DRT to FRT and PIN to PIT were changed to use more correct terminology. Added player status (stop, play, pause, scan). Added a field to the MPEG info record for play time. Added a field in the MPEG information record for average sector (bit) rate. Revision # 2c, 1999/11/2

Add placeholders for error code entry and system overview. Contents table 1 General rules ---------------------------------------------- ------- 12 1.1 Refer to the standard --------------------------------------- -------- 12 1.2 Arrangements -------------------------------------- ----- 12 1.3 Short Form and General Definitions --------------- 12 1.4 Data format and structure -------------------------- 13 1.5 System overview ---- --------------------------------------- 14 1.5.1 Player Reference Model ---- ------------------------------- 14 1.5.2. Disk reading module ----------- ------------------- 14 1.5.3 MPEG Decoder ------------------------- ------------ 14 1.5.4 Overlay Graphics and Text (OGT) --- 14 1.5.5 Playback Controller ---------------- --------------------- 15 1.5.6 Cache memory ----------------------- -------------- 15 2 Disk structure -------------------------------- ------------- 15 3 Phi Structure ---------------------------------------------------------------- 15 3.1 File record Table (FRT) file ----------------- 16 3.2 Playback item table (PIT) file ------------------- --16 3.3 Playback Control Program (PCP) File ------------- 17 3.4 MPEG File ---------------- ----------------------- 17 3.4.1. Features of MPEG files ------------------ ------------ 17 4 Playback Control Program (PCP) ----------------------------- 18 4.1 PCP File Structure --------------- 18 4.2 PCP Interpreter ----- -------------------------------- 18 4.2.1 PCP Structure --------------- ------------------------------- 18 4.2.2 PCP Interpreter Reference Model ----------- -------------- 19 4.2.3 FB program flow structure ---------------------------- --- 19 4.2.4 Player status ----------------------------------------- 20 4.3 P P register -------------------------------------------- 20 4.3.1 Variable register R [0-95] ----------------------------- 20 4.3.2 Player API Register R [128-255] --- ---------- 21 4.4 PCP Player (API) Function --------------------------- 23 4.4.1 FB Local variable memory (size) function ----------- 23 4.4.2 FB (address) function ----------------- ---------------- 23 4.4.3 Go-to-PCP (file number) function ------------------ 23 23.4.4 Go-to-disc (disc number) function ----------------- 24 4.4.5 Playback () function ----------------- -------------------------- 24 4.4.6 Playback event () ---------------- ----------------------- 25 4.4.7 MPEG file information function ------------------- ---------- 26 4.4.8 OGT selection (channel) function ------------------------- 26 4.4.9 Audio Selection (stream number) function ------ ----------- 26 4.4.10 Audio mixing (data) function ---------- 26 4.4.11 Hotspot () function-- ---------------------------- 26 4.4.12 User key () function ------------- --------------------- 26 4.4.13 Timer (Time) Function -------------------- -------------- 27 4.4.14 Error Handling ------------------------------ ------------ 27 4.4.15 OGT Rendering Function ------------------------------ 28 4.5 Definition of PCP Command ----------------------------------- 28 4.5.1 Command Code ---- ----------------------------------- 29 4.5.2 Operand symbol --------- ------------------------------ 29 4.5.3 Opcode Conditions -------------- ------------------------- 29 4.5.4 Definition of Opcode Function ----------------- ---------------- 30 4.5.5 Program example ---------------------------- ------------- 30 general rules

[0034]See standard   The following standards contain the text used by reference in this document.

[Table 1]

[0035]Arrangements   Items in bold are defined in this document.   Values and comments are italicized.   The hexadecimal value is preceded by the $ character.   The binary value is preceded by the% character.   The strings are listed within "".

[0036]Short form and general definition   The following abbreviations are used in this document: # Or # # Abbreviation for “number” Album Album is a set of discs with the same Album_ID. Album_ID Unique value that identifies all discs belonging to an album. Audio stream An MPEG stream is an audio stream with a number from 1 to max.
It can include Ostream. Surround audio support in extended streams
It is an option to do. Bitmap image An image representation where each pixel is represented by one or more bits. This
These bits represent different color values in the color look-up table (CLUT).
CLUT Color lookup table that defines the color value (RGB) of each entry
. FRT file record table, see 0. Hotspot A hotspot is defined by an ID number and area coordinates on the screen.
Hotspots are used for on-screen user interaction and users interact with PCP
Hotspots can be selected for cursor (cursor or pointer control)
By). The selection of the hotspot triggers a user input event. Hots
The pot uses a pointing device for user interaction (computer) playback
It can be used in sequence or as a system to highlight selected areas.
Wear. Areas within the indicated coordinates are highlighted. Player chooses frame thickness and color
be able to. It is recommended that such emphasis have two situations, one of which is
Data is in the area and the other is selected. Many areas selected
If the selected points are included (for overlapping selection areas), the lowest selection number
The selected area is selected. Hotspot area The hotspot coordinate area defines a rectangular selection area on the screen. Reduction
A scaled coordinate system is used, with the upper left limit screen coordinates being 0,0 and the lower right limit screen coordinates
Becomes 255,255. I-picture I-field image, that is, a video frame in the form of two fields
If encoded, include the start of the I-picture with the first of both fields
Sectors should be referenced (the second field is close to the expected grid
Even if). JPEG Joint Photographic Experts Group, See ISO / IEC 10918. Lsb least significant bit LSB least significant byte MPEG Moving Picture Experts Group, see ISO / IEC 11172. MPEG_PS MPEG-2 program stream, video stream, zero or more
Can include the above audio stream and MPEG private stream
Wear. MPEG private stream MPEG private including OGT data and trigger data
Stream. Msb most significant bit MSB most significant byte N / A. Not applicable A playback device that permanently stores some of the global variable registers for NVRAM disks
Is a non-volatile memory inside, and discs belonging to the same album are played again
Called when. This is an optional feature of the playback device. register
This is a function called when is set. The playback device is
NV-RAM is uniquely assigned to each disk by using the provided identifier. Overlay graphics and text capabilities for OGT MPEG decoders
Data to define. MPEG stream is 1 to maximum value for private stream
It may contain up to 8 OGT channels numbered up to. PIT play item table. Entry points (access points for all MPEG files
Sector) list. PCP playback control program. The program is very small and easy to implement
It is recorded in various forms. The program is compiled during the authoring process.
Optimized. The playback device (player) selects the PCP for navigation and playback selection.
Can be used for Playback device A device equipped with an optical pickup unit and a servo controller.
Disk loader, MPEG decoder, user I / F, player controller and PC
A compliant device including a playback processor with a P interpreter. PS MPEG program stream. It is a set of MPEG basic streams. RT real time. Data to be decoded for real-time output (MPEG) file
Classification of files. R / W Read and write. Used to define the characteristics of the PCP register
It

[0037]Data format and structure   The following data formats are used in this specification.

[Table 2]

[0038]System overview   This is either a ROM (2K addressable sector) disk format.
Disk system that presents a complete video with associated audio using
Is. The system is designed for full-screen TV quality images and associated high quality audio.
ISO / IEC MPEG2 standard for compressing video, still image and audio information
Use righteousness. The disc is a high-quality still image (menu) and a navigator of the disc.
It also contains a playback control program file for playback and playback control.

[0039]Player reference model   The system consists of a disc and a reproducing device (player) compliant with the disc.

Disk reading module

MPEG decoder

Overlay graphics and text (OGT)

Playback controller

[0044]Cache memory   This is an optional function in the playback device. Phi access in player
Can take 1 to 2 seconds, but cache frequently used files
By storing it in memory, the access time can be ignored. MPEG
When the file is first read, the playback device asks the priority value and how much cache.
Whether to store the file in cache memory depending on whether the memory is full
Can be determined. The priority value is an estimate of the probability that the file will be reused.
Give a degree. This is a menu still image file that typically has a size of 1 to 200 KB.
It is especially effective for files. Cache memory must be 1MB or more
However, due to the declining memory price, this adds a small price to the player.
I can't do it.

Disk structure

[Table 3]

File structure

[Table 4]

[0047]File recording table (FRT) file   Structured, including file directory records indexed by file number
Files. The record relates to where the file is located on the disc
Contains information. The default file number for this file is zero.

[Table 5]

[0048]Play item table (PIT) file   A structured file that contains play item records. The default file for this file
The file number is 1.

[Table 6]

[0049]Playback control program (PCP) file   A continuously stored FB structured file that together represents the playback control program.
Ile. See Section 0 for PCP file structure. The PCP file is
It is represented by its file number. Default file for startup PCP file
The ill number is 2.

[Table 7]

MPEG file

[Table 8]

Features of MPEG files

[Table 9]

[0052]Playback control program (PCP)   The PCP contains the navigation structure of the disc. PCP is written in PCP file
Remembered The file is divided into functional blocks called FB. Disc
At start-up, PC for a PCP file with File_number = play
The P interpreter starts interpreting the first FB at address = 0, and End () function
 Continues until is called.

PCP file structure

[Table 10]

[0054]PCP interpreter   The PCP interpreter must interpret and execute the command instructions in the FB.
Absent. These commands are one until a Return () or other function is called.
Each must be interpreted in turn. Error_handler if an error is detected
Should be called. Most commands meet certain command conditions.
Is executed only when

The PCP interpreter is easy to implement using a standard microcontroller. This is because it is necessary to handle only three simple type operations.・ Reading / writing variable and register data; ・ Arithmetic operation on variable; ・ Order management of command interpreter.

[0056]PCP structure   The relationship between the different PCP data elements is shown in the chart below.

[Table 11]

[0057]PCP interpreter standard model   The PCP interpreter reads FB commands one by one and defines them in Section 0.
To execute the command instruction. The command reads the data and puts it in a variable array
Write. The value written to the register variable should be stored in memory. value
Is written to the player register part, a specific function () is called and the next
Command should be executed before it is interpreted. See chart below.

[Table 12]

[0058]FB program flow structure   The control flow structure between the FB, PCP file and the disc is shown in the chart below.

[Table 13]

[0059]Player status   An MPEG player in an MPEG device can be in one of the following states:
It These states are important for the player () function (see 0).

[Table 14]

[0060]PCP register   The PCP interpreter is a 2-byte (16 bytes) containing variables and player registers.
An array of registers R [0..255], which is the player function and MP
API for PCP interpreter to interface with EG decoder
And function. The PCP register is read and written by the PCP interpreter.
Can be impressed. 256 registers are indexed from 0 to 255
. The player is the current player profile to be read by the PCP interpreter.
The player register that reflects the state must be set. Disc start
Upon up, the default player value should be used. some
The player allows the user to change the default value. PCP is R / W
You can control the player by writing a value to the layer register.
The player must implement controls that would produce the same conditions. R / W
The layer register is actually two different registers, one of which is the player
To read the state, and the other is to give commands to the player.
It should be noted that there is. The player is busy executing register commands
If not, these values can be different.

Variable register, R [0..95]

[Table 15]

Player API register, R [128..255]

[Table 16]

[0063]PCP player (API) function   The playback device must support the following functions.

[0064]FB local variable memory (size) function   This function is called when the FB var_size register is set. The function is
Must allocate the number of requested local FB variables in memory
. Local memory is limited to 256 variables (512 bytes).
Noh aims to optimize the memory usage processing by the PCP interpreter.
It Up to 32 variables can be assigned to each FB function. New FB function
Is called, the size value is reset to zero, so the local FB variable
The register must be set to 1 to 32 before you can use
Otherwise an error will be detected.

[0065]FB (address) function   These functions can be set by setting the FB_address register with the values defined below.
Be called.

[Table 17]

[0066]Goto_PCP (File_number) function   These functions depend on setting the File_number register with the values defined below.
Called by.

[Table 18]

[0067]Goto_Disc (Disc_number) function   These functions consist in setting the Disc_number register to the value defined below.
Called by.

[Table 19]

[0068]Play () function   This function is enabled by setting the value specified below in the Play_Item register.
Be dealt with.

[Table 20]

[Table 21]

[0069]Play_event ()   Play_event can occur only during Play () function, and the corresponding play_event_ID is P
Should be returned in the lay_item register. The play_events are listed below.

[Table 22]

[0070]MPEG file information file   This function uses MPEG_file_info register as File_directory_rec of FRT file.
Called if set to ord file_number. Playing_time, OGT and Aud
The io_stream register is based on the File_info stored in File_directory_record.
Should be set. This register is either a valid file_number or Fil
Should return 0 if e_ID <> 10 (MPEG file), -1 otherwise.
.

[0071]OGT_select (channel) function   This function is called if the OGT_select register is set. OGT_chan
nel is selected as the setting channel. If set to 0, OGT display is disabled
. When set to an invalid value, it returns 0 (disable).

[0072]Audio_select (stream number) function   This function is called when Audio_select is set. Audio player
Ream is selected as the setting number. If set to 0, disable audio (mu
To) When set to an invalid value, it returns 0 (disable).

[0073]Audio_mixing (data) function   This function is called when the Audio_mixing register is set. Ode
Biomixing is set as specified by the setpoints defined below.
To do.

[Table 23]

[0074]Hotspot () function   The hotspot feature is used for on-screen user interaction, so
Can select a hotspot to interact with the PCP (cursor or
Is under pointer control). ID number of the selected hotspot (128 .. 143)
Should be stored in the Input_data register. Specified coordinates (top, bottom, left
, Right) should be highlighted. Emphasizing, for example, the selected hotspot
Draw a frame around the selected area or increase the contrast in the selected area.
It can be implemented by changing. Playback device selects frame thickness and color
can do. It is recommended that such enhancements have two characteristics. one
, If the pointer is inside the hotspot area and the other is
This is the case when it is selected. Many hotspot areas contain selected points
In the case of overlapping selection areas, the selection area with the smallest ID number is Input_da.
Should be returned in the ta register. A hotspot has all region values (all
Value> = 0 and within the screen area, specified by bottom> = top and right> = left)
Enabled if enabled. When hotspots are disabled all hot
The spot area register is set back to -1. Hotspot area enabled
By writing the valid ID number of the hotspot to the Input_data register,
Can be adjusted. If the Input_data register is set to an invalid value, -1 will be returned.
To be done.

[0075]User key () function The user key () function is based on the user interaction of pressing the enabled key.
Be started. The key is enabled when the corresponding Userkey_mask bit is set to 1.
To be done. The function stores the Key number value in the Input_data register as defined below.
Return to

[Table 24]

[0076]Timer (time) function   The time function is called if the Timer_data register is set. Timer
, When the Timer_data register is set to a value> 0 (in units of 1/10 sec)
The register value is changed every 1/10 second until it reaches 0 at which the timer is stopped.
Is subtracted and counted. When the Timer_data register is set to 0, the timer is stopped
It

[0077]Error handling   The error is handled by the error handler, which skips the current command
Or select to terminate the PCP playback. Error handler command
The position of the block is stored in a dedicated register. Error handler returns
Command returns to the next command (skip) and calls the End () function
Ends the PCP reproduction. Different kinds of errors can occur during PCP playback
It The error code can be read from the Error_code register.

[Table 25]

[0078]OGT_rendering function   This feature is an optional extension. If not supported, OGT_image level
Should return -2 to Dista.

This function uses OGT_image register in File_directory_record in FRT file.
Called when set to file_number of. The image data of the file is
Should be rendered in the selected hotspot area. Portions of the image area outside the hotspot selection area should be discarded (cropped).

Normally, OGT can be used only when reproducing a moving image file. This feature can be used to overlay selectable OGT images on still images and menus. This is useful for interacting with the user without loading new images and can be selective for language preferences.

[0081]Definition of PCP command   All commands are 5 bytes. The first byte is the opcode and the trailing
4 bytes are an operand. The PCP interpreter is compatible with the opcodes in the table below.
The command defined by the operand should be executed. Most commands
Conditionally, depending on the value of one or more variables, only if the condition is true
Means that the command is executed. Variable value or register in variable array
The setting can be written by the command, and the value can be read by the condition judgment.
To be done. The register is referenced by R [index]. Command is referenced by Cmd [index]
Where the index is greater than 0 with respect to the starting point of the current functional block FB.
Value.

Command code

[Table 26]

[0083]Operand symbol   In the PCP opcode and operand definition table, special symbols refer to the table below.
As used in different definitions.

[Table 27]

[0084]Opcode conditions   The reading of the array variable is executed by the condition judgment. If the condition is true, the next frame
Entry is executed. Cond_1 judgment compares variable R [i] against 0,
The _2 decision compares the relationship between the two variables R [i] and R [j] as defined below.
It

[Table 28]

[0085]Opcode Function Definition calculate_1 function-if cond1 is true, indexed by byte # 3
The variable R [j] is a constant defined by bytes # 4 and # 5 = the result of calculation with dddd.
, Where byte # 4 is the MSB. The calculation type is opcode (xxx) bits 2.
It is specified by .0 as shown in the table below. calculate_2 function-if cond2 is true, indexed by byte # 3
Variable R [j] defined by byte # 4 is defined by variable R [k] and byte # 5
Is set to the result of the calculation of the variable R [l] The calculation type is opcode (xxx) bits 2.
It is specified by 0 as shown in the table below.

[Table 29] Move Function--The variable R [k] indexed by byte # 4 is set equal to the variable R [k] indexed by byte # 5. Set Function--The variable R [j] indexed by byte # 3 is set to the value dddd defined by bytes # 4 and # 5. Random Function--Variable R [j] indexed by byte # 3 is 0 (zero)
And a dddd defined by bytes # 4 and # 5. If dddd = 0, randomize the random generator. Fill Function--Fill N variables starting with R [j] with dddd defined by bytes # 4 and # 5. Where N is R [indexed by byte # 2
i]. Jump Function--Jump to instruction immediately with index = idx defined by bytes # 4 and # 5. loop_1 Function--Decrement and count R [i] as defined by byte # 2 and if cond # 1 is true, jump to instruction at index = idx defined by bytes # 4 and # 5. loop_2 Function--Subtract R [i] as defined by byte # 2 and if cond # 2 is true, jump to instruction at index = idx defined by bytes # 4 and # 5. loop_3 Function--R [i] is subtracted and counted as specified by byte # 2, byte # 2
Subtract R [j] as defined by 3, and if cond # 1 is true, jump to the instruction at index = idx defined by bytes # 4 and # 5.

[Brief description of drawings]

[Figure 1]   FIG. 1 shows an embodiment of a record carrier according to the present invention.

[Fig. 2]   FIG. 2 shows an embodiment of the device according to the invention.

[Figure 3]   FIG. 3 shows an embodiment of the method according to the invention.

[Figure 4]   FIG. 4 illustrates the relationship between some aspects of the invention.

[Figure 5]   FIG. 5 shows another embodiment of the method according to the invention.

[Explanation of symbols]

  1 ... record carrier   2 ... file 11 ... Audiovisual data 12 ... Playback control data 15 ... bus 20 ... Reading means 21 ... Control means 30 ... Processing means 31 ... Processing memory 32 ... Interpreter 34 ... Execution means 35 ... Event handler 37 ... Trigger detector 39 ... Cache memory 40 ... User input means 41 ... User input means 51 ... MPEG video decoder 53 ... MPEG audio decoder

─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D044 AB07 BC03 CC06 DE29 DE48                       FG10 FG18 GK12                 5D090 AA01 BB02 CC04 FF24 GG36

Claims (11)

[Claims] 1. A record having information organized into a plurality of files including audiovisual data and playback control data for controlling playback of the audiovisual data on a playback device while allowing user interaction. The carrier, wherein the information further comprises priority information indicating a relative priority with which the file should be stored in a cache memory of the playback device. 2. The record carrier according to claim 1, wherein the priority information is contained in a single file. 3. The record carrier according to claim 1, wherein the priority information relates to an estimated frequency with which the data is accessed. 4. The record carrier according to claim 1, wherein the control data is included in a control program having a reference to a menu, and the data representing the control program and the menu have a relatively high priority. A record carrier, characterized in that 5. Playback for playing a record carrier having information organized in a plurality of files comprising audiovisual data and playback control data for controlling playback of the audiovisual data while enabling user interaction. In the device, the reproducing device includes a reading unit that reads the data from a record carrier, a cache memory that stores the data from the record carrier, an input unit that inputs a user input, and a control unit that processes the control data. And reproducing means for reproducing the audiovisual data, wherein the device is configured to read priority information and store a file in the cache memory at a priority determined by the priority information. Characterizing playback device. 6. The reproducing apparatus according to claim 5, further comprising means for rewriting the priority information on the record carrier according to the frequency with which the file is actually accessed by the user. Playback device. 7. A method of reproducing a record carrier having information organized into a plurality of files comprising audiovisual data and reproduction control data for controlling reproduction of the audiovisual data while enabling user interaction. In step a., Determining whether the cache memory has sufficient unoccupied space, and aa. Determining that the cache memory does not have sufficient unoccupied space. Determining whether the cache memory has a sufficiently large space occupied by one or more other data files having a priority value lower than the priority value of the first data file, aaa. A step of overwriting the one or more other data files with the first data file if the result is true. A method for reproducing a record carrier, which comprises: 8. The reproducing method according to claim 7, wherein if the determination result of step a is true, ab. A step of determining whether the first data file has a priority value higher than a predetermined value. Aba. Loading the first data file from the record carrier into the cache memory when the result of the determination in step ab is true. 9. A method for reproducing a record carrier having information organized into a plurality of files, which comprises audiovisual data and reproduction control data for controlling reproduction of the audiovisual data while enabling user interaction. In the method, in order to load the file into the cache memory, the method includes: d. Setting a reference priority value; and e. Regarding the plurality of files, whether the priority value assigned to the file is higher than the reference priority value. Ea. Determining whether the cache memory has sufficient space to store the unit of data when the determination result of the step e is true, eaa. Loading the unit of the data into the space if the determination result of step ea is true; f. Decreasing the reference priority value G. A step of determining whether the reference priority value is greater than or equal to a base priority value, and ga. A step of repeating steps d to g when the determination result of step g is true. A method of reproducing a record carrier, characterized in that it has the following procedure. 10. A record having information organized into a plurality of files including audiovisual data and playback control data for controlling playback of the audiovisual data on a playback device while allowing user interaction. An apparatus for recording a carrier, wherein said information further comprises priority information indicating a relative priority that said file should be stored in a cache memory of said playback device, said audiovisual Means for obtaining data, means for creating the control data, priority determining means for determining the priority information, format means for formatting the audiovisual data and the control data into a file, and the priority information And information including the audiovisual data and the control data. Apparatus for recording a record carrier which is characterized in that it has a recording means for recording the record carrier. 11. A record having information organized into a plurality of files including audiovisual data and playback control data for controlling playback of the audiovisual data on a playback device while enabling user interaction. A method of recording a carrier, wherein said information further comprises priority information indicating a relative priority that said file should be stored in a cache memory of said playback device. Obtaining data, creating the control data, determining the priority information, formatting the audiovisual data and the control data into a file, the priority information, and the audio The information bearing the visual data and the control data is recorded on the recording medium. Method of recording a record carrier which is characterized in that it comprises the steps of: storing the at.