KR20050018311A - Method and apparatus for reproducing AV data in interactive mode and information storage medium thereof - Google Patents

Abstract

PURPOSE: A method for reproducing AV data in ENAV(Enhanced Navigation) mode, a device therefor, and an information storage medium therefor are provided to guarantee the seamless reproduction of AV data corresponding to an ENAV application by performing a preload process, and to clearly suggest the preload process, thereby supplying compatibility of the preload process. CONSTITUTION: A parser reads a loading information file loaded in an ENAV buffer(1201), and verifies whether the read loading information file is available(1202). An interpreter interprets the loading information file to send position information on an ENAV file to an interface handler, so that the interface handler can transmit the position information to a buffer manager(1203). The ENAV buffer reads a necessary ENAV file from a disk or a network(1204). The buffer manager confirms that a preload process is terminated by perceiving a state of the ENAV buffer, and generates a preload trigger to the interface handler(1205). The interface handler converts the preload trigger into a preload complete event, and transmits the event to the interpreter. The interpreter receives a verified initial file to interpret the file(1206).

Description

A method and apparatus for reproducing AV data in interactive mode and information storage medium, among others.

The present invention provides a method and apparatus for preloading ENAV data necessary for seamlessly playing back AV data in an enhanced navigation mode (hereinafter referred to as "enhanced navigation mode") into a buffer, and playing back the preloaded ENAV data. The information storage medium.

Interactive DVDs that can be played in ENAV mode are sold based on a personal computer (PC). AV data is recorded on the interactive DVD, while data necessary for supporting the ENAV mode is further recorded. Therefore, the AV data recorded on the interactive DVD can be reproduced in two ways. One is a video mode that is displayed in the same way as a normal DVD, and the other is an ENAV mode in which the reproduced AV data is displayed via a display window defined by a markup document. When the ENAV mode is selected by the user, the browser loaded on the PC interprets and displays the ENAV data recorded on the interactive DVD. The AV data selected by the user is embedded in the screen according to the markup document and / or the application program displayed in the ENAV mode. A representative example of ENAV data is a markup document. A markup document refers to a document written in markup language.

For example, if the AV data is a movie, a part of the markup screen in which the markup document is interpreted and displayed is embedded in the movie screen, and the rest of the markup screen includes a script of the movie, a plot, a photograph of the actor, Etc. Various additional information about the movie is displayed. The additional information includes various resource files such as image files and text files. Furthermore, the displayed markup document allows 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 currently playing movie screen is displayed.

However, in the ENAV mode, since a DVD drive mounted on a PC must read the ENAV data into the buffer in addition to reading the AV data from the interactive DVD into the buffer, there is a possibility that a break occurs while playing the AV data. . In other words, there is a problem that seamless reproduction of AV data is difficult to be guaranteed.

Accordingly, a technical problem to be achieved by the present invention is to reload AV data in ENAV mode using ENAV data, to ensure seamless playback of AV data, preload necessary ENAV data into a buffer, and preload the ENAV data. The present invention provides a method of reproducing, an apparatus thereof, and an information storage medium thereof.

The object is, according to the present invention, AV data; And at least one ENAV application having at least one ENAV file for reproduction with the AV data, wherein the ENAV application is the ENAV file, wherein the ENAV file is to be buffered in advance before the ENAV application is played. It is achieved by an information storage medium, characterized in that it comprises a loading information file in which preload information informing location information is recorded.

Preferably, the loading information file further includes postload information indicating the location information of the ENAV file buffered after the ENAV application starts playing.

The loading information file is preferably linked via a startup file, linked to a predetermined ENAV file constituting another ENAV application, or specified through an API recorded in a predetermined ENAV file constituting another ENAV application.

On the other hand, according to another aspect of the present invention, the object is a method for reproducing the AV data in the ENAV mode, the method comprising the steps of: (a) reading the loading information file; (b) verifying the loading information file; (c) interpreting the verified loading information file and delivering preload information to the buffer manager informing location information of an ENAV file to be preloaded; (d) The buffer manager is also achieved by a method comprising controlling the ENAV buffer to preload the target ENAV file before playback of the corresponding ENAV application starts with reference to the received preload information. .

Preferably, the step (d) further includes generating a preload trigger when the buffer manager is preloaded.

The method preferably includes (e) starting playback of the corresponding ENAV application using the buffered ENAV file and displaying the corresponding AV data in the ENAV mode.

(E) parsing the initial file; And generating the document object tree and then interpreting and executing it according to the document life cycle.

In the step (c), further comprising the step of parsing the loading information file and delivering postload information to the buffer manager informing the location information of the ENAV file to be post-loaded, after the step (e) ( f) The buffer manager preferably further comprises controlling the ENAV buffer to buffer the corresponding ENAV file with reference to the received postload information.

On the other hand, according to another field of the present invention, the object is a reader for reading the AV data recorded on the disk; An AV playback engine for decoding AV data read by the reader; And an ENAV engine for interpreting and executing the ENAV file recorded on the disc through the reader to display the AV data decoded by the AV playback engine together with the ENAV file, wherein the ENAV engine is the ENAV file. Also achieved by the reproducing apparatus characterized by preloading the ENAV file necessary to ensure seamless reproduction of the AV data with reference to the preload information recorded in the loading information file.

The ENAV engine includes an ENAV buffer in which the ENAV file is preloaded; A buffer manager for controlling the ENAV buffer according to the preload information; A parser for verifying the loading information file; An interpreter for interpreting the preload information from the verified loading information file; And an interface handler for transferring the preload information from the interpreter to the buffer manager.

When the preload is completed, the buffer manager preferably generates a preload trigger to the interface handler indicating that the preload is completed. The interface handler preferably notifies the interpreter by converting the preload trigger into an event. When the event is delivered, the interpreter preferably transmits to the parser to parse from an initial file that should be executed first among ENAV files buffered in the ENAV buffer.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a disc 100 in which AV data is recorded according to an embodiment of the present invention.

Referring to FIG. 1, a disc 100 according to the present embodiment is a disc in which ENAV data is recorded so that AV data can be reproduced in an ENAV mode, and AV data is recorded in an MPEG bitstream in the track, and ENAV data is recorded in the track. A plurality of ENAV files contained therein are recorded. Here, the "ENAV file" includes an image file, an animation file, and a sound file which are linked to the markup document and the markup document and are reproduced or displayed together with the markup document. Markup documents are documents written in markup languages such as XHTML and SMIL, as well as documents in which program code written in program languages such as Script language are linked or inserted, as well as cascading style sheets (CSS) that define the style of markup documents. It is used in a comprehensive sense. In other words, the ENAV file serves as a kind of application necessary for reproducing the AV data in the ENAV mode and also provides additional content displayed along with the AV data.

FIG. 2 is a reference diagram for explaining a relationship between AV data recorded on the disk 100 of FIG. 1 and ENAV files for seamless reproduction in the ENAV mode.

Referring to FIG. 2, an ENAV application is associated with AV data for which seamless reproduction is guaranteed. One ENAV application points to a collection of at least one ENAV files. In other words, in order to ensure seamless reproduction of the AV data, the corresponding ENAV application is preloaded. <Preload> means that the ENAV application required before playing the AV data in the ENAV mode is read and buffered.

Each ENAV application contains one loading information file. The loading information file contains preload information necessary for preloading, that is, location information about an ENAV file to be buffered before a corresponding ENAV application is launched.

Preloading is performed for each ENAV application. In other words, seamless playback is guaranteed for the AV data corresponding to each ENAV application. Accordingly, it is desirable in view of the user interface that a content producer ensures seamless playback by producing one ENAV application corresponding to one video title and one video title chapter.

On the other hand, in response to the preload, <postload> refers to buffering a predetermined ENAV file after the corresponding ENAV application is launched. An ENAV application does not necessarily have an ENAV file to post load. When postload is required, the loading information file records postload information necessary for postloading, that is, location information of the ENAV file to be postloaded.

3 is a schematic diagram of a volume space of the disk 100 of FIG. 1.

Referring to FIG. 3, in the Volume Space of the disc 100, a Volume and File structure area in which information about a volume and a file is recorded, AV data is recorded in a DVD-Video format, that is, a video title is a DVD-Video Data area, There is an ENAV file area in which ENAV files for supporting the ENAV mode are recorded.

In the DVD-Video data area, VIDEO_TS.IFO containing the playback control information for the entire video title recorded on the disc 100 and VTS_01_0.IFO containing the playback control information for the first video title are recorded. The constituent AV data VTS_01_0.VOB, VTS_01_1.VOB, ... are recorded. VTS_01_0.VOB, VTS_01_1.VOB, ... are video titles, that is, video objects. 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".

The ENAV file area stores an ENAV application composed of a plurality of ENAV files. That is, as an ENAV file, a startup file first read when the ENAV mode is selected, a markup document corresponding to the selected video title, and the like are recorded.

4 is a directory structure diagram of the disk 100 of FIG.

Referring to Fig. 4, a DVD video directory VIDEO_TS exists in the root directory, and an ENAV directory DVD_ENAV in which ENAV data for supporting the ENAV mode is recorded is provided.

VIDEO_TS stores data described with reference to FIG. 2, that is, VIDEO_TS.IFO, VTS_01_0.IFO, VTS_01_0.VOB, VTS_01_1.VOB, and the like. DVD_ENAV stores data described with reference to FIG. 2, that is, a startup file STARTUP.MLS and other ENAV files.

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

Referring to FIG. 5, the playback system includes a disk 100, a playback device 200, a TV 300 as a display device according to the present embodiment, and a remote controller 400. The remote controller 400 receives a user's control command and transmits the control command to the playback apparatus 200. The playback device 200 is provided with a DVD drive for reading data recorded on the disc 100. When the DVD 100 is loaded in the DVD drive and the user selects the ENAV mode, the playback apparatus 200 reproduces the corresponding AV data in the ENAV mode using the corresponding ENAV file and transmits the AV data to the TV 300. The TV 300 displays the AV screen according to the reproduced AV data and the markup screen obtained from the markup document together. The "ENAV mode" refers to a method of reproducing the AV data so that the AV screen is displayed on the display window defined by the markup document, that is, a method of embedding the AV screen on the markup screen and displaying the AV data. Here, the AV screen refers to a screen displayed on the display device by reproducing AV data, and the markup screen refers to a screen displayed on the display device after the markup document is interpreted. On the other hand, the "video mode" refers to a method of reproducing AV data of a conventional DVD-Video, that is, a method of displaying only an AV screen obtained by reproducing the AV data.

The playback device 200 supports both the ENAV mode and the video mode. In particular, according to the present invention a preloaded corresponding ENAV application from the disc 100 to ensure seamless playback, and the preloaded ENAV files are interpreted and executed.

Furthermore, the playback apparatus 200 connects to a network such as the Internet and performs postload.

6 is a block diagram of a playback apparatus 200 according to an embodiment of the present invention.

Referring to FIG. 6, the playback apparatus 200 is a device supporting the video mode and the ENAV mode according to the present embodiment, and includes a reader 1, an AV playback engine 2, and an ENAV engine 3. The reader 1 is provided with an optical pickup (not shown) for reading data by irradiating a laser onto the disk 100.

The reader 1 controls the optical pickup in accordance with the control signal of the ENAV engine 3 or the AV reproduction engine 2 to read the AV data and the ENAV data from the disc 100.

The ENAV engine 3 is an analysis engine that interprets and executes markup languages and script languages in order to support the ENAV mode, that is, to present an ENAV file read by the reader 1. Furthermore, the ENAV engine 3 further includes various plug-ins. Plug-ins allow you to open files in various formats that are included in or linked to markup documents. In other words, the ENAV engine 3 serves as a markup document viewer. Also, in the present embodiment, the ENAV engine 3 can access the Internet and read the ENAV data.

The AV reproduction engine 2 decodes the selected video title in the ENAV mode and delivers the decoded AV data stream to the ENAV engine 3. The ENAV engine 3 interprets the markup document so that the AV data stream is displayed in the display window defined by the markup document, that is, the AV screen is embedded in the markup screen, so that the AV data stream and the rendered mark The up document is blended and output to the TV 100.

In particular, according to the present invention, the ENAV engine 3 preloads the ENAV file into a buffer (not shown) provided in the ENAV engine 3 beforehand in order to ensure seamless reproduction of the AV data in the ENAV mode, and then preloads it. The generated ENAV file. That is, information about the ENAV file to be preloaded is obtained from the loading information file read from the disc 100, and then preloaded. A detailed description of the loading information file will be given later.

FIG. 7 is an embodiment of the ENAV engine 3 of FIG. 5.

Referring to FIG. 7, the ENAV engine 3 includes an interface handler 31, a buffer manager 32, an ENAV buffer 33, a parser 34, and an interpreter 35.

The ENAV buffer 33 is a buffer for buffering ENAV files under the control of the buffer manager 32, in which the ENAV files are preloaded according to the loading information file to ensure seamless reproduction of the AV data. Furthermore, when the postload is performed, the ENAV files that are postloaded are buffered.

The parser 34 validates the ENAV file of the predetermined format according to a predetermined rule, preloaded in the ENAV buffer 33, and then converts it into a format that the interpreter 35 can understand. For example, in the case of a markup document, the document is validated according to a data type definition (DTD), and then a document object tree is generated. The following rules apply to creating a document object tree. First, the root node of every node is set as a document node, second, all text and elements create nodes, and third, processing instructions, comments, and documenttypes create nodes. In the case of a style sheet, the style sheet is parsed to generate a style rule / selector list. Style sheets give you the freedom to style your markup document. In this embodiment, the syntax and format of the style sheet follows the Cascading Style Sheet (CSS) of the W3C.

The interpreter 35 interprets and executes the ENAV file in the format delivered from the parser 35. In interpreting and executing an ENAV file, Korean Patent Application No. 2002-31069, "Method and Apparatus for Playing in Interactive Mode Using Markup Document," filed June 3, 2002, and the applicant, filed June 3, 2002. It is interpreted and executed in accordance with the document life cycle disclosed in Korean Patent Application No. 2002-70014, "Method for Reproducing AV Data in Interactive Mode Using Markup Document, and Apparatus thereof," filed May 12. The interface handler 31 controls the interface between the AV reproduction engine 2 and the interpreter 35. That is, the interface handler 31 receives a trigger from the user, the AV reproduction engine 2, the buffer manager 32, and the interpreter 35 and converts it into a corresponding event.

8A and 8B illustrate an embodiment of a loading information file according to the present invention.

Referring to FIG. 8A, it can be seen that a loading information file is linked to a startup file that is first read in an initialization process performed when the disc 100 is inserted into the playback apparatus 200 or the power is turned on.

FIG. 8B illustrates the implementation of FIG. 8A. In the startup file STARTUP.MLS, there is a "loadinginfo" element having the location of the loading information file as an attribute value. The symbol A indicates that the name attribute of the "condition" element is "lang", the value is "en", the name attribute of the "condition" element is "profile", and the value is " 00 (version number) "indicates the part where the location information of the loading information file to be read is recorded, and the symbol B indicates the loading information file to be read if it does not correspond to the condition defined by the" condition "element above. Indicates the portion where position information is recorded.

9A, 9B, 10A and 10B show another embodiment of a loading information file according to the present invention.

Basically, the loading information file contains a list of ENAV files (to be preloaded or postloaded) that exist in the belonging ENAV application. Therefore, in the first execution as in the method of FIGS. 8A and 8B, one loading information file is selected by the startup file, and then ENEN files according to the selected loading information file are loaded into the ENAV buffer 33. However, the startup file cannot be used to switch to another ENAV application during playback, so a new loading information file is obtained by the following method.

Referring to FIG. 9A, there is an anchor element linking a loading information file for another ENAV application to an ENAV file belonging to one ENAV application. That is, the loading information file is linked using arbitrary <a href=" ">, </a>.

FIG. 9B is an implementation of FIG. 9A, where a new loading information file is delivered to parser 34 when a user executes a hyperlink that is labeled "New Loading Information."

Referring to FIG. 10A, an API for calling a loading information file for another ENAV application is recorded in the last ENAV file belonging to one ENAV application.

FIG. 10B illustrates the implementation of FIG. 10A, where a new loading information file is passed to the parser 34 when script code (API) is executed.

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

Referring to Fig. 11, the loading information file is to be loaded into the ENAV buffer 33 after preloading, i.e. postloading, the list of ENAV files that should be preloaded into the ENAV buffer 33 before the corresponding ENAV application is launched. Contains a list of ENAV files that should be used as basic information.

The "manifest" element is used as the root element of the loading information file. There are two different types of "entityset" elements. The first "entityset" element contains a list of ENAV files to be preloaded, and the second "entityset" element contains a list of ENAV files to be postloaded. Within the "entityset" element, the "xml: base" attribute is used to indicate the location of several ENAV files. In the "entityset" element, the "initial" element or the "entity" element is used to specify the location of each ENAV file. The "initial" element specifies the markup document that should be executed first after preload. The "initial" and "entity" elements MUST contain an "href" attribute that specifies the location of the ENAV file.

The reproduction method according to the present invention will be described based on the above configuration.

12 is a flowchart for explaining a playback method according to the present invention.

Referring to FIG. 12, in the same manner as described with reference to FIGS. 7A, 7B, 8A, 8B, 9A, and 9B, when the loading information file is buffered in the ENAV buffer 33, the parser 34 stores the ENAV buffer 33. After reading the loading information file loaded in step (1201), through a parsing process such as grammar verification, and verifying that it is a valid loading information file (step 1202), the verified loading information file to the interpreter 35 The interpreter 35 interprets the loading information file and passes the preload information (and / or postload information), i.e., position information for the ENAV file, to the interface handler 31, which in turn Transfer to the buffer manager 32 (step 1203). The buffer manager 32 controls the ENAV buffer 33 by referring to the information on the ENAV file to be preloaded among the loaded loading information, so that the ENAV buffer 33 stores the required ENAV file from the disk 100 or the network. Read it (step 1204). The buffer manager 32 checks the state of the ENAV buffer 33 to confirm that the preload is completed, and generates a preload trigger to the interface handler 31 indicating that the preload is completed (step 1205). The interface handler 31 converts the preload trigger into an event indicating that the preload is completed and transmits it to the interpreter 35.

When the preload is completed, ENAV files including the initial file to be reproduced for the first time by the ENAV engine 3 are placed in the ENAV buffer 33. The initial file is a markup document specified by the "initial" element, as described below. Receiving the event according to the buffer trigger that the preload has been completed, the interpreter 35 reads the parser 34 from the initial file, checks whether it is a valid document, receives the verified initial file, analyzes it, and executes it (step 1207). . After the initial file is executed, the remaining ENAV files are interpreted and executed as well.

On the other hand, even after step 1205 above, that is, while ENAV files buffered first by preload are being played, ENAV files to be postloaded in the ENAV buffer 33 continue to be loaded if there is an ENAV file to be postloaded. . That is, the ENAV buffer 33 buffers certain ENAV files from the network under the control of the buffer manager 32. Upon completion of postloading, the buffer manager 32 sets "allDone" status indicating the buffer status to "TRUE".

If there is no ENAV file to postload after step 1205 above, the buffer manager 32 sets the status of "allDone" indicating the buffer status as "TRUE" to indicate that all loading is completed. Set to "." The interpreter 35 may check using the allDone API which is a property to find out the loading completion state.

As described above, according to the present invention, the seamless reproduction can be guaranteed for the AV data corresponding to the ENAV application by performing the preload. Furthermore, by clearly presenting the preload process step by step, compatibility of the preload process is provided in implementing the reproduction apparatus and the information storage medium thereof.

1 is a schematic diagram of a disc 100 in which AV data is recorded according to an embodiment of the present invention;

FIG. 2 is a reference diagram for explaining a relationship between AV data recorded on the disk 100 of FIG. 1 and ENAV files for seamless reproduction in the ENAV mode; FIG.

3 is a schematic diagram of a volume space of the disk 100 of FIG.

4 is a directory structure diagram of the disk 100 of FIG.

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

6 is a block diagram of a playback apparatus 200 according to an embodiment of the present invention;

7 shows an embodiment of the ENAV engine 3 of FIG. 5,

8A and 8B illustrate an embodiment of a loading information file according to the present invention;

9A, 9B, 10A and 10B illustrate another embodiment of a loading information file according to the present invention;

11 is an embodiment of loading information file LodingInformation.ldi according to the present embodiment

12 is a flowchart for explaining a playback method according to the present invention.

Claims (5)

In the method of playing back AV data in ENAV mode, (a) reading the loading information file; (b) parsing the loading information file; (c) interpreting the verified loading information file and delivering preload information to the buffer manager informing location information of an ENAV file to be preloaded; And and (d) controlling the ENAV buffer to preload the target ENAV file before playback of the corresponding ENAV application starts with reference to the received preload information. The method of claim 1, Step (d) Generating a preload trigger when the buffer manager is preloaded. The method of claim 1, (e) starting playback of the corresponding ENAV application using the buffered ENAV file to display the corresponding AV data in the ENAV mode. The method of claim 3, Step (e) is Parsing from an initial file; And Generating a document object tree and then interpreting and executing it according to the document life cycle. The method of claim 1, In the step (c), Parsing the loading information file and delivering postload information to a buffer manager informing location information of an ENAV file to be post loaded, After step (e) (f) the buffer manager further comprising controlling the ENAV buffer to buffer the corresponding ENAV file with reference to the received postload information.