KR100532109B1 - Information storage medium containing interactive memory configuration information - Google Patents

Abstract

An information storage medium having recorded ENAV buffer configuration information, a reproduction device thereof, and a buffer management method thereof are disclosed.

An information storage medium according to the present invention includes at least one ENAV file containing ENAV data; And ENAV buffer configuration information for allocating at least a portion of the ENAV buffer into which the ENAV file is loaded, as an updateable markup region. As a result, various services through the Internet can be properly provided to the user.

Description

Information storage medium containing ENB buffer configuration information {Information storage medium containing interactive memory configuration information}

The present invention relates to an apparatus for reproducing contents recorded in an information storage medium in an interactive mode, and more particularly, to a method for managing an ENAV buffer mounted in a reproducing apparatus capable of reproducing AV data in an interactive mode, and a reproducing apparatus. An information storage medium.

Based on a personal computer (PC), a DVD (hereinafter referred to as an "interactive DVD") that supports the interactive mode is sold so that AV data can be played back in the interactive mode. In the interactive DVD, AV data is recorded according to the conventional DVD-Video standard, and a markup document is further recorded as ENAV data for supporting the interactive function. AV data recorded on the interactive DVD can be displayed in two modes. One is a video mode displayed in the same manner as a normal DVD-Video, and the other is an interactive mode in which an AV screen is embedded in a markup document and displayed together with the markup document, that is, an interactive screen is displayed. For example, when the AV data is a movie title, a movie may be displayed on the AV screen, and various additional information such as a script of the movie, a plot, a photograph of the actor, and the like may be displayed on the rest of the interactive screen. The additional information may be displayed in synchronization with the title (AV data). For example, when a specific actor starts to appear, a markup document containing history information about the actor is called and displayed. Furthermore, markup documents displayed in interactive mode allow for interaction with the user. For example, when the user presses a button provided in the markup document, the bio of the actor appearing on the AV screen currently being played is displayed.

The present applicant has made a number of prior applications for a playback device having various functions as a home appliance that can play an interactive DVD more user-friendly that can support the interactive mode.

However, if a home appliance (home DVD player) capable of playing an interactive DVD, that is, supporting an interactive mode, is implemented, buffer management for supporting the interactive mode becomes a problem.

Figures 1a and 1b is a reference diagram that clearly shows the problems of the prior art.

As shown in FIG. 1A, in the conventional PC 5, the main buffer 55 has a capacity of several hundred megabytes (256 MB) or more, and the hard disk 56, which is an auxiliary buffer, has tens of gigabytes (32 GB ~). ) Has a capacity of more than. Therefore, when the data is to be retrieved from the server 9 through the Internet, the size of the buffer is small compared to the size of the data, so that the desired data cannot be received.

However, as shown in FIG. 1B, the home DVD player 2, which is a home appliance used by being connected to the TV 1, does not have a large buffer capacity, unlike the conventional PC 5, and typically has several tens of megabytes (32 MB ~). Only has a buffer 25.

Therefore, when the home DVD player 2 accesses the server 9 via the Internet and receives predetermined content, the server 9 can store the content in a buffer without restriction as in the case of the conventional PC 5. If so, the home DVD player 2 will not be able to accept the content.

Accordingly, a technical problem to be solved by the present invention is to provide a playback device that supports an interactive mode as a home appliance, and when a predetermined content is received from a server by accessing the Internet, the buffer capacity is not exceeded even with a small buffer. The present invention provides a method of managing a buffer so that a desired content can be received and reproduced, a reproduction device thereof, and an information storage medium thereof.

According to an aspect of the present invention, there is provided a buffer management method of an interactive apparatus, the method comprising: (a) allocating at least a portion of an ENAV buffer as an updateable markup region for an ENAV file based on ENAV buffer configuration information; And (b) loading a predetermined ENAV file using the assigned updatable markup area.

The step (a) may include allocating the updateable markup area according to the memory size information included as the ENAV buffer configuration information, or according to the memory name and the size information included as the ENAV buffer configuration information. Preferably, the method includes allocating an updateable markup region.

Step (a) includes reading the ENAV buffer configuration information recorded in the loading information file, and step (b) refers to the name and location information of the ENAV file recorded in the loading information file. Preferably, the method includes loading a corresponding ENAV file.

The step (a) may include reading the ENAV buffer configuration information recorded using the memory element in the loading information file, or using the attribute of the memory element in the loading information file to record the memory name and its size. Reading a predetermined loading information file, including reading as the ENAV buffer configuration information or referring to a startup file stored in a directory in which ENAV files are stored; And reading the ENAV buffer configuration information recorded in the loading information file.

In the step (b), the ENAV file stored in the disc is loaded into the updateable markup area by referring to the name and location information of the ENAV file recorded in the loading information file, or the ENAV recorded in the loading information file. And requesting a server to load the ENAV file provided from the server into the updatable markup area based on the name of the file and its location information.

In addition, the above object is a buffer management method for a chat service of an interactive device, comprising: (a) allocating at least a portion of an ENAV buffer as an updateable markup area for an ENAV file based on ENAV buffer configuration information; And (b) loading the ENAV file for the chat service in the allocated buffer area.

On the other hand, according to another field of the present invention, the object is at least one ENAV file containing the ENAV data; And ENAV buffer configuration information for allocating at least a portion of the ENAV buffer into which the ENAV file is loaded, as an updatable markup area.

The ENAV buffer configuration information is recorded in a loading information file indicating a name and location information of predetermined ENAV files to be read in advance, or recorded using a memory element in the loading information file, or a memory element in the loading information file. It is preferable that the memory name and its size are recorded using the attribute of or recorded in a loading information file linked to a startup file stored in a directory for ENAV files.

On the other hand, according to another field of the present invention, the above object is a playback device capable of reproducing AV data in an interactive mode, comprising: an ENAV buffer into which an ENAV file is loaded; And an ENAV engine for interpreting and reproducing the ENAV file, wherein the ENAV engine allocates at least a portion of the ENAV buffer to an updateable markup region based on ENAV buffer configuration information, and then reads the ENAV file to read the ENAV file. It is also achieved by a playback device characterized by loading into the ENAV buffer.

The ENAV engine reads the ENAV buffer configuration information recorded in a loading information file informing the name and location information of predetermined ENAV files to be read in advance, or the ENAV recorded using a memory element in the loading information file. Startup of the buffer configuration information, the memory name and its size recorded using the attribute of a memory element in the loading information file as the ENAV buffer configuration information, or stored in a directory for the ENAV files It is preferable to read the ENAV buffer configuration information recorded in the loading information file linked to the file.

In addition, the above object is a reproduction apparatus capable of reproducing AV data in an interactive mode, comprising: an ENAV buffer into which an ENAV file for providing a predetermined Internet service is loaded; And an ENAV engine for interpreting and reproducing the ENAV file, wherein the ENAV engine allocates at least a portion of the ENAV buffer to an updateable markup region based on ENAV buffer configuration information, and then reads the ENAV file to read the ENAV file. It is also achieved by a playback device characterized by providing the chat service by loading it into an ENAV buffer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, "ENhanced (AV) data" is used to mean data covering the interactive mode. For example, when playing DVD-Video in the interactive mode, the ENAV data is divided into markup documents and markup resources inserted into the markup document. The markup document refers to a file such as A.xml written in markup language such as XML, HTML, or a style sheet file that specifies the style of the markup document. The markup resource is inserted into A.xml. Points to png, A.jpg, A.mpeg, etc. In particular, markup documents can be viewed together with the AV data while serving as an application required to play the AV data in interactive mode, either as the document itself or with the embedded program code or as a separate file externally. Loss plays the role of ENAV data.

2 is a schematic diagram of a playback system according to a preferred embodiment of the present invention.

Referring to FIG. 2, the playback system includes a DVD 300 as an information storage medium according to the present embodiment, a playback device 200, a TV 100 as a display device according to the present embodiment, and a remote controller 400 as a user input device. ). The remote controller 400 receives a control command of the user and transmits the control command to the playback apparatus 200. The reproducing apparatus 200 is an interactive apparatus according to the present invention which connects to the Internet and transmits and receives predetermined ENAV data. At this time, the playback apparatus 200 performs buffer management for supporting the interactive mode according to the present invention. A detailed description of the buffer management will be given later.

On the other hand, the reproduction device 200 is provided with a disc drive (not shown) for reading data recorded on the disc 300. When the disc 300 is loaded in the disc drive and the user selects the interactive mode, the playback apparatus 200 reproduces the corresponding AV data in the interactive mode using the corresponding markup document and transmits the AV data to the TV 100. In the TV 100, the AV screen is embedded in the markup screen obtained from the markup document and displayed together. The "interactive mode" refers to a method of displaying AV data in a display window defined in a markup document, that is, a method of displaying an AV screen embedded in an interactive screen. Here, the AV screen refers to a screen on which the AV data is reproduced and displayed on the TV 100, and the interactive screen refers to a screen displayed in the interactive mode, that is, a screen in which the AV screen is embedded. On the other hand, the "video mode" refers to a method of reproducing the AV data as defined in the conventional DVD-Video, that is, a method of displaying only the AV screen obtained by reproducing the AV data on the TV 100. In the present embodiment, the playback device 200 supports the interactive mode and the video mode.

3 is a block diagram of the playback device 200.

Referring to FIG. 3, the playback apparatus 200 includes an AV buffer 201, an ENAV buffer 202, an AV playback engine 203, and an ENAV engine 204.

The AV buffer 201 is a buffer for buffering AV data, and the ENAV buffer 202 is a buffer for buffering ENAV data. In the present embodiment, the AV data may be DVD-Video data recorded in the DVD 300 according to the DVD-Video format or AV data of another format obtained from the Internet. In this embodiment, the ENAV data is implemented as a markup document and / or markup resource. In hardware, the AV buffer 201 and the ENAV buffer 202 may be implemented as separate memory chips, or may be implemented as one memory chip.

The AV reproduction engine 203 decodes and outputs AV data. In the present embodiment, the AV reproduction engine 203 has an MPEG decoder capable of decoding DVD-Video data. The ENAV engine 204 is an interpretation engine that interprets and executes ENAV data, and supports an interactive mode and a video mode. From a software point of view, the ENAV engine 204 includes a markup document viewer that interprets and displays markup documents, and a markup resource decoder that decodes browsers and markup resources that can fetch certain data from the Internet. The output of the ENAV engine 204 and the output of the AV reproduction engine 203 are blended into an interactive screen and displayed on the TV 100.

The present applicant has applied for a number of prior applications containing various methods or contents related to the AV screen embedded in the interactive screen. Examples include Korean Application Nos. 01-33526, 01-64943, and 01- filed June 14, 2001, October 20, 2001, October 23, 2001, and August 26, 2002, respectively. 65391 and 02-50524.

 Further, the ENAV engine 204 manages the ENAV buffer 202 in accordance with the present invention. That is, in order to load a predetermined ENAV file containing ENAV data based on the ENAV buffer configuration information, a predetermined area of the ENAV buffer 202 is allocated as an updateable markup area, and then the ENAV file is loaded in the allocated area. An ENAV file is a file that contains ENAV data. In addition, the ENAV engine 204 manages the updatable markup area according to the configuration information of the updatable markup area.

4 is a reference diagram for explaining ENAV buffer configuration information according to the present invention.

Referring to FIG. 4, in this embodiment, the ENAV buffer 202 is divided into two areas A and B logically or physically. The symbol A is an Updatable Markup Area, where at least part of the ENAV buffer 202 is an area allocated for storing ENAV data, markup documents and markup resources according to an example. The symbol B is a general area and stores markup documents that do not need to be updated, such as cascading style sheet (CSS) files, script files, image files, and font files that specify the style of the markup document. do. In other words, the ENAV buffer configuration information informs the size of the updateable markup area in the ENAV buffer 202. The remaining area becomes the general area.

As such, the ENAV buffer 202 has an updateable markup area, so that it is possible to receive an Internet service (eg, a chat service) as described below with a small capacity.

As a more specific embodiment, a chat service provided using an updateable markup area will be described below.

5 shows a volume space of the disk 300 according to the present embodiment.

Referring to FIG. 5, the volume space of the disc 300 is divided into a volume and file control information area, an AV data area, an ENAV data area, and other data areas. In the Volume and File control information area, volume and file control information for the entire disk is recorded. In the AV data area, video titles, VIDEO_TS.IFO, VTS_01_0.IFO, VTS_01_0.VOB, VTS_01_1.VOB ..., which are AV data recorded in the DVD-Video format, are recorded. VIDEO_TS.IFO is a file in which reproduction control information for the entire video title is recorded, and VTS_01_0.VOB, VTS_01_1.VOB, ... are files constituting a video title set. VTS_01_0.VOB, VTS_01_1.VOB, ... are video titles that constitute a video title set, that is, a video object. Each VOB contains a VOBU packed with a navigation pack, video pack, and audio pack. A more detailed configuration is disclosed in the DVD-Video standard "DVD-Video for Read Only Memory disc 1.0".

In the ENAV data area, ENAV data for supporting the interactive mode is recorded. That is, the startup file STARTUP.MLS, which is the markup document that is displayed first when the interactive mode is selected, the loading information file LoadingInformation.LDI, which contains the configuration information of the ENAV buffer configuration information and the updateable markup region according to the present invention, and the chat service The markup document files, CHATTITLE.HTM, CHATROOM.HTM, and markup resources C1.PNG, C2.PNG ... are provided to provide. In the other data area, files containing other data can be recorded.

6 is an example of a directory structure of the disk 300 according to the present invention.

Referring to FIG. 6, a video directory VIDEO_TS including AV data is provided in the root directory. In VIDEO_TS, a file VIDEO_TS.IFO in which navigation information for the entire video title is recorded is arranged. Subsequently, a file VTS_01_0.IFO in which the navigation information for the first video title set is recorded is recorded, and VTS_01_0.VOB, VTS_01_1.VOB, ... that constitute the video title set are recorded. The root directory is also provided with an interactive directory DVD_ENAV in which information for supporting the interactive mode is stored. DVD_ENAV includes a markup document STARTUP.MLS for display with a video title, a loading information file LoadingInformation.LDI containing configuration information of an ENAV buffer configuration information and an updateable markup area according to the present invention, and a markup for providing a chat service. Document files, CHATTITLE.HTM, CHATROOM.HTM, and markup resources C1.PNG, C2.PNG ... are recorded.

7 is an example of a startup file, STARTUP.MLS, according to the present embodiment.

Referring to FIG. 7, the startup file STARTUP.MLS, which is a markup document written using the markup language, has an "loadinginfo" element. The symbol C points to the part that links the loading information file using the "loadinginfo" element. That is, the "loadinginfo" element links the loading information file LodingInformation.ldi for loading ENAV files necessary for playing in the interactive mode, that is, indicating the location information of the corresponding ENAV files. As described above, the EANV buffer configuration information according to the present invention is recorded in the loading information file.

8 is an example of a loading information file LodingInformation.ldi according to the present embodiment.

Referring to FIG. 8, ENAV buffer configuration information according to the present embodiment is recorded in the portion indicated by the symbol D in the loading information file LodingInformation.ldi according to the present embodiment using a “memory” element. The "memory" element is an empty element that does not nest other elements, and has two attributes, "name" and "size", to indicate the name and memory size of the memory area. Has properties The "name" attribute specifies the name of the memory area. "um" indicates an updateable markup area. The "size" attribute indicates the size of the memory area. The size of the memory area is dependent on the size of the ENAV buffer 202. If the ENAV buffer 202 is 36 MB, it may have a value from 0 byte to 36 MB.

In the present embodiment, since the "name" attribute is "um" and the "size" attribute is "6KB", it means that 6KB is allocated as an updateable markup region in the ENAV buffer 202. The remaining area becomes the general area.

Furthermore, in the loading information file, names and location information of ENAV files to be loaded into the buffer in advance for the chat service according to the present embodiment are recorded. The first file to be displayed for the chat service is recorded as CHATROOM.HTM using the "initial" element. The remaining files are CHATTITLE.HTM, C1.PNG, C2.PNG, INPUT.HTM, P1.GIF, DIALOG. .HTM, and DIALOG.CSS are recorded using the "entity" element. Here, CHATTITLE.HTM, C1.PNG, C2.PNG are stored on the disk 300, and INPUT.HTM, P1.GIF, DIALOG.HTM, and DIALOG.CSS are the Internet "http://www.company. com ". In particular, DIALOG.HTM and DIALOG.CSS indicate that they are loaded in the updatable markup area.

9 is an example of a chat screen for a chat service supported by the playback apparatus 200 according to an exemplary embodiment of the present invention.

Referring to FIG. 9, the chat screen has a chat window in which the contents of a conversation between users participating in the chat are displayed and an input window for inputting a word desired by one of the chats. When the user inputs a word to input in the input window and presses the send button <Send> provided on the chat screen, the playback device 200 sends the message to a server (not shown) that provides a chat service through the Internet. The server sends an updated markup document in which the word received from the user is displayed, that is, the updated markup document, to the playback apparatus 200. The playback device 200 displays the updated markup document, and the dialog box displays the word just input by the user.

10 through 12 are examples of markup documents for the chat screen of FIG. 9.

Referring to FIG. 10, CHATROOM.HTM is stored in the disk 300 and is a markup document that is displayed first when a user selects a chat service. CHATROOM.HTM has a link to the markup document CHATTITLE.HTM stored on disk 300 to display the chat title, and is stored on the server providing the chat service http://www.company.com to display the chat window. The frequently updated markup document DIALOG.HTM is linked.

Referring to FIG. 11, DIALOG.HTM is updated every time a user wants to say something and shows that it is a markup document provided from the server http://www.company.com.

Referring to Fig. 12, INPUT.HTM is a markup document provided from the server http://www.company.com to display an input window of a chat screen.

FIG. 13 shows a communication process between a playback device 200 and a server 90 for providing a chat service according to a preferred embodiment of the present invention.

Referring to FIG. 13, the reproduction device 200 is provided with an ENAV buffer 202 having a limited capacity. The server 90 provides a chat service to the playback device 200 through the Internet. The playback device 200 and the server 90 communicate according to the client-server model. In this embodiment, the communication is performed according to the HyperText Transfer Protocol (HTTP) protocol of TCP / IP based on the client-server model.

When the playback device 200 accesses the server 90 and then requests a markup document DIALOG.HTM for displaying a dialog using the GET command (communication process ①), the server 90 receives the requested markup document ②. Send DIALOG.HTM to playback device 200 (communication process ②). The playback device 200 may use the PUSH command instead of the GET command. Similarly, the playback device 200 requests the markup document INPUT.HTM for displaying the input window using the GET command (communication process ③), and requests the markup resource P1.GIF (communication process ④). 90 sends the requested markup document INPUT.HTM and markup resource P1.GIF to the playback device 200 (communication process ⑤, ⑥).

On the other hand, as described later, the server 90 updates the predetermined file (markup document and / or markup resource) so as to have a size smaller than or equal to the buffer capacity allocated to the file. Will allow you to receive updated files correctly.

14 and 15 show an example of the communication process ① and ② of FIG.

14 illustrates an example of importing a markup document DIALOG.HTM for displaying a chat window on a chat screen via a loading information file LOADINFO.LDI containing ENAV buffer configuration information. (1) is a configuration of a header (REQUEST Header) of a request (REQUEST) for the reproduction device 200 to send a GET command to the server 90 according to the HTTP protocol. In particular, the User-Agent informs the type of the playback apparatus 200, and Referer: informs that the document referencing the markup document DIALOG.HTM is the buffer configuration information file LOADINFO.LDI stored in the interactive directory of the disk 300. (2) is a configuration of the header of the response (RESPONSE) according to the GET command from the playback apparatus 200, which is the client according to the HTTP protocol, that is, the RESPONSE Header. In particular, Last-modified: may explicitly indicate that the markup document DIALOG.HTM is a document that is updated at the server 90, that is, a document that may be changed. Accordingly, the playback apparatus 200 may regard the markup document or the document whose markup resource is not to be changed unless Last-modified: is present in the RESPONSE Header from the server 90.

FIG. 15 shows an implementation example of importing a markup document DIALOG.HTM for displaying a chat screen of a chat screen through CHATROOM.HTM for displaying a chat screen. (1) is a configuration of a header (REQUEST Header) of a request (REQUEST) for the reproduction device 200 to send a GET command to the server 90 according to the HTTP protocol. In particular, the User-Agent informs the type of the playback apparatus 200, and Referer: informs that the document referencing the markup document DIALOG.HTM is the markup document CHATROOM.HTM stored in the interactive directory of the disk 300. (2) is a configuration of the header of the response (RESPONSE) according to the GET command from the playback apparatus 200, which is the client according to the HTTP protocol, that is, the RESPONSE Header. In particular, Last-modified: may explicitly indicate that the markup document DIALOG.HTM is a document that is updated at the server 90, that is, a document that may be changed. Accordingly, the playback apparatus 200 may regard the markup document or markup resource as a document that will not be changed unless Last-modified: is present in the RESPONSE Header from the server 90.

16 shows configuration information of an updatable markup region according to the present embodiment, which is determined according to ENAV buffer configuration information.

Referring to Fig. 16, the configuration information of the updateable markup area is information recorded on the disc 300 (in this embodiment, recorded in a loading information file for a chat service), and corresponds to the location information in which the ENAV file is stored. Contains information on the size of the buffer area to be allocated for the ENAV file. Furthermore, it may further include information indicating the format of the corresponding ENAV file and whether it is updated in the server 90.

The position information indicates a server 90 that can communicate with a playback device 200 equipped with an ENAV buffer 202 or a disk 300 mounted on a playback device 200 equipped with an ENAV buffer 202. In this embodiment, the location information pointing to the server 90 is displayed as http://www.company.com/DIALOG.HTM, and the location information pointing to the disk 300 is file: //DVD_ENAV/CHAROOM.HTM. Is displayed. In the present embodiment, the size information is represented as 5 KBytes. The size information is not displayed for every file. On the other hand, as an example of usage (update or not), text / xml + chat (yes) indicates that the corresponding file is a text file, an xml document, used for a chat chat, and updated on the server 90 (yes).

17 illustrates a configuration of an updatable markup region according to configuration information of the updatable markup region of FIG. 16.

Referring to FIG. 17, a buffer area is allocated to the ENAV buffer 202 according to the configuration information of the markup area of FIG. 16. More specifically, since the buffer size information to be secured for DIALOG.HTM stored in http://www.company.com/DIALOG.HTM is 5KBytes, the buffer area is allocated 5KBytes. Since DIALOG.CSS stored at http://www.company.com/DIALOG.CSS is 1KBytes, the buffer area is allocated 1KBytes. INPUT.HTM and P1.GIF stored at http://www.company.com/INPUT.HTM and http://www.company.com/P1.GIF do not have size information, so the size determined by server 90 As many buffer areas are allocated. As described above with reference to FIGS. 14 and 15, the server 90 may allocate the size of a file to be transmitted by the server 90 through Content-length: of the RESPONSE header.

file: //DVD_ENAV/CHATROOM.HTM, file: //DVD_ENAV/CHATTITLE.HTM, file: //DVD_ENAV/C1.PNG and file: //DVD_ENAV/C2.PNG correspond to the corresponding files CHATROOM.HTM and CHATTITLE. The HTM, C1.PNG, and C2.PNG are stored in the disk 300, and thus the buffer area is allocated by the size of the file determined by the file system of the playback apparatus 200.

Referring to the buffer management method according to a preferred embodiment of the present invention based on the above configuration as follows.

18 is a flowchart illustrating a buffer management method according to an embodiment of the present invention.

Referring to FIG. 18, the playback device 200 is configured to have an ENAV buffer according to the present invention, which is linked by opening a startup file STARTUP.MLS stored in the DVD_ENAV directory when the disc 300 is loaded and the user selects the interactive mode. Read the loading information file LodingInformation.LDI containing the information (step 1801). The ENAV buffer configuration information is checked through the loading information file (step 1802), and an updateable markup area of the ENAV buffer 202 is allocated accordingly (step 1803). The remaining area of the ENAV buffer 202 becomes a general area. The meaning of the general area has been described above.

19 is a flowchart illustrating a buffer management method according to another embodiment of the present invention.

Referring to FIG. 19, when the user selects a chat service, the playback device 200 interprets a startup file recorded on the disk 300 as ENAV buffer configuration information for a chat service according to the present embodiment. In operation 1901, a loading information file including configuration information of the updatable markup region is read. The information recorded in the loading information file confirms whether a file to be loaded in the ENAV buffer 202 exists (step 1902), and if not present, first interprets and displays a document to be displayed on the screen (step 1901). If it is present, it is checked whether the file size is set (step 1904). If it is set, the buffer area is secured by the set size (step 1906). If it is not set, the location is checked (step 1907), and if it is stored on the disk 300, the buffer area is secured to the size determined by the file system (step 1908), and the server is not stored on the disk 300. If it is stored at 90, the server 90 secures the buffer area by the predetermined size (step 1909). When the buffer area is secured (step 1910), the corresponding file is loaded into the reserved buffer area (step 1911). If it fails to secure the buffer area, it is notified that the buffer area is not secured and ends (step 1912). On the other hand, if the user needs to use different buffer configuration information in the process of searching and displaying the markup document, the process returns to step 1902 again and repeats the same process.

 On the other hand, when the user searches for the markup document and confirms that the DIALOG.HTM is updated in the server 90, the playback device 200 receives the updated DIALOG.HTM from the server 90. At this time, when the server 90 updates the markup document (and / or markup resource), if the size thereof is within a preset buffer area range (5 KBytes in the above example), the playback apparatus 200 buffers the buffer. The updated contents can be properly processed and displayed without causing an error due to insufficient capacity. Further, when a request for using configuration information of another updatable markup area is generated in the process of searching for a markup document, the playback apparatus 200 returns to step 1902 and repeats the same process.

On the other hand, the above-described buffer management method can be created by a computer program. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. The program is also stored in a computer readable medium, and read and executed by a computer to implement the buffer management method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

As described above, according to the present invention, when the server provides predetermined content to a playback device, which is a home appliance supporting an interactive mode, the server can adjust its size more adaptively to the buffer capacity of the playback device. Since the reproducing apparatus reserves a buffer space before receiving from the server, the buffer can be used in a decisive method even in a reproducing apparatus as a home appliance having limited buffer capacity. Accordingly, even if the markup document and / or markup resource is freely updated on the Internet, the content provider can display the screen as long as the content provider makes the size smaller than the predetermined size according to the buffer configuration information.

Examples of markup documents and / or markup resources that are freely updated on the Internet may include various applications such as a chat service, a stock information providing service, a news providing service, and a list of purchased items when shopping on the Internet.

Figures 1a and 1b is a reference diagram showing the problems of the prior art,

2 is a schematic diagram of a playback system according to a preferred embodiment of the present invention;

3 is a block diagram of a playback device 200;

4 is a reference diagram for explaining ENAV buffer configuration information.

5 is a configuration diagram of a volume space of a DVD 300 according to the present invention;

6 is an example of the directory structure of the DVD 300 according to the present invention;

7 is an example of a startup file, STARTUP.MLS, according to the present embodiment;

8 is an example of a loading information file LodingInformation.ldi according to the present embodiment;

9 is an example of a chat screen for a chat service supported by the playback device 200 according to an embodiment of the present invention.

10 to 12 are examples of markup documents for the chat screen of FIG. 9;

13 is a schematic diagram of a communication process between a playback device 200 and a server 90 for providing a chat service according to a preferred embodiment of the present invention;

14 and 15 illustrate examples of the communication process ① and ② of FIG.

16 shows configuration information of an updatable markup region according to the present embodiment, which is determined according to ENAV buffer configuration information;

17 is a configuration diagram of an updateable markup region according to the configuration information of the updateable markup region of FIG. 16;

18 is a flowchart illustrating a buffer management method according to an embodiment of the present invention;

19 is a flowchart illustrating a buffer management method according to another embodiment of the present invention.

Claims (7)

At least one ENAV file containing ENAV data; And And an ENAV buffer configuration information for allocating at least a portion of an ENAV buffer into which the ENAV file is loaded, as an updateable markup region. The method of claim 1, And the ENAV buffer configuration information is recorded in a loading information file that informs the names and location information of predetermined ENAV files to be read in advance. The method of claim 1, And the ENAV buffer configuration information is recorded in the loading information file using a memory element. The method of claim 1, The ENAV buffer configuration information is recorded in the loading information file using a property of a memory element and a memory name and its size is recorded. The method of claim 1, The ENAV buffer configuration information is recorded in a loading information file linked to a startup file stored in a directory for ENAV files. The method according to any one of claims 1 to 5, Further includes an AV file containing the AV data, And the ENAV file is a file for reproducing the AV file in an interactive mode. The method of claim 6, The AV file is a file created according to the DVD-Video format. And the ENAV file comprises a markup document written in a markup language for playing the AV file in an interactive mode.