KR20040071580A - Method and apparatus for reproducing AV data in interactive mode, and information storage medium therefor - Google Patents

Abstract

PURPOSE: A device for reproducing AV data in an interactive mode, a device thereof and an information storage medium thereof are provided to previously read converted ENAV units by emptying buffers when the ENAV units are converted while reproducing predetermined AV data, thereby continuously reproducing the AV data. CONSTITUTION: An audio buffer(41) buffers audio data reproduced according to AV data. A basic buffer(43) buffers font data or image data used to render a text in a markup resource. An ENAV-unit buffer(42) buffers ENAV pages in ENAV units. The ENAV units are data groups for previously reading AV data at a time to continuously reproduce the AV data, and include at least one ENAV page. An ENAV buffer manager(61) senses when the ENAV units are converted into other ENAV units, empties one of an ENAV-unit buffer1(421) and an ENAV-unit buffer2(422), and buffers a next ENAV unit in the emptied buffer.

Description

Method and apparatus for reproducing AV data in interactive mode, and information storage medium therefor}

The present invention relates to a method for reproducing AV data in an interactive mode. More particularly, the present invention relates to a reproducing method, apparatus, and an information storage medium for appropriately buffering interactive data for reproducing AV data in an interactive mode. It is about.

Interactive DVDs that can be played on a PC are available. An interactive DVD refers to a DVD in which interactive data necessary for reproducing the recorded DVD-Video data in the interactive mode, that is, a markup document or the like is further recorded. Interactive DVDs can be played in two modes. One is a video mode in which only DVD-Video data is reproduced and displayed like a normal DVD, and the other is an interactive mode in which DVD-Video data is reproduced with a markup document and displayed through a display window of the markup document. When the interactive mode is selected by the user, the web browser mounted on the PC interprets and displays the markup document recorded on the interactive DVD. The display window defined by the markup document displays the DVD-Video data selected by the user.

For example, when the DVD-Video data is a movie, a movie may be displayed on the display window of the markup document, and various additional information such as a movie script, a storyline, a photograph of the actor, and the like may be displayed on the remaining part. The additional information includes an image file and / or a text file.

1 is a physical structural diagram of a track of a conventional interactive DVD.

Referring to FIG. 1, DVD-Video data, that is, AV data, is recorded in an MPEG bitstream in a track of an interactive DVD, and various image files, graphic files, and the like, inserted into a plurality of markup documents or markup documents as interactive data. A comprehensive markup resource is recorded.

FIG. 2 is a reference diagram for describing a disconnection phenomenon that may occur in the process of playing the interactive DVD of FIG. 1.

Referring to FIG. 2, the state of an AV buffer in which DVD-Video data is buffered and the state of an interactive buffer in which interactive data is buffered are shown. Referring to FIGS. 1 and 2, the AV data is buffered and displayed in a buffer, and the pickup apparatus searches for, reads, and buffers STARTUP.HTM in the buffer. The loaded STARTUP.HTM is activated. At the same time, ① AV data according to the user's selection is buffered and then started to be displayed. ② AV data is then buffered and displayed. When the buffering of the AV data is completed, the pickup device jumps to the position where the AV data is recorded and starts buffering. At this time, if the user requests ④ A.HTM, the pickup device stops buffering the AV data and searches for and buffers ④ A.HTM. In the meantime, since the AV data continues to be displayed, the amount of buffered and displayable data is drastically reduced. ④ A.HTM is activated, ③ AV data is buffered, and then ⑤ AV data is buffered. When the buffering of the AV data is completed, the pickup device jumps to the position where the AV data is recorded. In this case, a phenomenon may occur that all the buffered data is exhausted. That is, in the conventional interactive DVD, the pickup device buffers the AV data when the DVD-Video screen and the markup screen are to be viewed in synchronization with each other (for example, when a specific actor appears and a bio is displayed for the actor). In this case, the DVD-Video screen may be suddenly broken because the corresponding markup document must be searched and read for buffering the markup document.

Accordingly, a technical object of the present invention is to provide a method of reproducing a playback phenomenon such that the playback is not interrupted by smoothly buffering the interactive data in reproducing the AV data in the interactive mode, an apparatus thereof, and an information storage medium thereof. will be.

1 is a physical structural diagram of a track of a conventional interactive DVD;

FIG. 2 is a reference diagram for explaining a disconnection phenomenon that may occur in the process of playing the interactive DVD of FIG. 1;

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

4 is a block diagram of a playback apparatus according to a preferred embodiment of the present invention;

FIG. 5 shows an embodiment of the ENAV buffer 4 of FIG. 4 and a relationship diagram between the ENAV buffer 4 and the ENAV buffer manager 61;

6 is a relationship diagram between the AV buffer 3 and the AV buffer manager 51 of FIG. 4;

7 is a diagram illustrating a buffer control method according to an embodiment of the present invention;

8 is a layout view of interactive data on a disc according to an embodiment of the present invention;

9 is a directory layout diagram of interactive data on a disk according to an embodiment of the present invention;

10 is a file structure diagram of an ENAV unit according to an embodiment of the present invention;

11 and 12 illustrate an example of connection information for performing the buffer control method of FIG. 7 according to the first embodiment of the present invention;

13 is a diagram illustrating an example of synchronization information for performing the buffer control method of FIG. 7 according to the first embodiment of the present invention;

14 is a reference diagram illustrating a method of performing buffer control of FIG. 7 according to a second embodiment of the present invention;

15 is a reference diagram illustrating a method of performing buffer control of FIG. 7 according to a third embodiment of the present invention;

FIG. 16 is a diagram illustrating how much AV data should be read in order to read one ENAV unit of the present invention, and how large is the size for buffering the AV data.

According to the present invention the technical problem, AV data; And interactive data for reproducing the AV data in an interactive mode, wherein the interactive data includes a plurality of ENAV units having a predetermined size or less.

The interactive data includes connection information between the AV data and the ENAV unit described using the structure of the AV data, and the connection information uses reproduction time information of the AV data or reproduction position information of the AV data. It is desirable to describe.

Preferably, the ENAV unit includes at least one ENAV page, and synchronization information indicating a time point to be displayed is recorded in each ENAV page.

Alternatively, the interactive data may include a markup document and a markup resource linked to the markup document.

Preferably, the connection information is included in a startup file to be interpreted before outputting the ENAV page.

Preferably, the synchronization information is recorded in each markup document corresponding to the ENAV page.

Alternatively, the connection information may be included in a schedule file that records schedule information recording the time point at which the ENAV unit is read from the buffer memory of the playback device and the time point at which the ENAV unit is deleted from the buffer memory.

Preferably, the AV data is DVD-Video data, and the connection information and synchronization information are described using a presentation time stamp of the DVD-Video data.

In addition, the technical problem is AV data; And interactive data for reproducing the AV data in an interactive mode, wherein the interactive data is divided into a plurality of ENAV units having a predetermined size or less, and a start page of each ENAV unit is stored with a predetermined start file name. It is achieved by an information storage medium characterized by the presence of.

Preferably, the ENAV unit includes at least one ENAV page, and the start page is any one of the ENAV pages.

In addition, the technical problem is AV data; And interactive data for reproducing the AV data in an interactive mode, wherein the interactive data includes at least one ENAV page, in which the control command information for the ENAV buffer buffering the ENAV page is recorded. It is also achieved by an information storage medium characterized by the fact that it is provided.

Preferably, the control command information is information for instructing to discard data stored in the ENAV buffer.

The interactive data is divided into a plurality of ENAV units including the ENAV page, and the control command information is information for instructing to discard the ENAV unit stored in the ENAV buffer and read the next ENAV unit.

On the other hand, according to another field of the present invention, in the apparatus for reproducing the AV data in the interactive mode, the interactive data for reproducing the AV data in the interactive mode, divided into a plurality of ENAV units of a predetermined size or less ENAV buffer to buffer the; And an ENAV buffer manager which controls the ENAV buffer to read and discard the interactive data in units of ENAV units.

The ENAV buffer manager controls the ENAV buffer to read an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the structure of the AV data. The ENAV buffer is controlled to read an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the reproduction time information of the AV data, or Control the ENAV buffer to read the corresponding ENAV unit with reference to the synchronization information recorded in the markup document corresponding to each ENAV page, or refer to the synchronization information and the connection information between the AV data and the ENAV unit. It is preferable to control the ENAV buffer to read a corresponding ENAV unit.

According to another aspect of the present invention, an object of the present invention is to provide interactive data for reproducing the AV data in the interactive mode, which is divided into a plurality of ENAV units having a predetermined size or less. An ENAV buffer buffered; And an ENAV buffer manager which controls the ENAV buffer to read a corresponding ENAV unit when a start page with a predetermined file name is found.

Preferably, the ENAV unit includes at least one ENAV page, and the start page is any one of the ENAV pages.

According to another aspect of the present invention, the above object is a method for reproducing AV data in an interactive mode, the method comprising: (a) reading interactive data for reproducing the AV data in the interactive mode in units of ENAV units having a predetermined size or less; Buffering in a manner of entering and discarding; And (b) reproducing the AV data in the interactive mode using the buffered interactive data.

The step (a) may include reading an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the structure of the AV data, or Reading an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the reproduction time information of the AV data, or on the ENAV page. Reading the corresponding ENAV unit with reference to the synchronization information recorded in the corresponding markup document, respectively, or corresponding ENAV unit with reference to the synchronization information and connection information between the AV data and the ENAV unit It is preferable to include the step of reading.

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

In the present specification, "interactive data" means data necessary for reproducing AV data in the interactive mode. The interactive mode refers to a mode in which not only an AV screen obtained from AV data is displayed but also additional screens or a screen capable of interacting with a user. For example, interactive data refers to markup resources that encompass not only markup documents but also files that are inserted or linked to markup documents. Further, "~ .HTM" represents documents written in markup languages such as XML and SGML displayed in interactive mode as well as HTML.

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

Referring to FIG. 3, 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 DVD 300 stores interactive data for reproducing DVD-Video data and DVD-Video data, which are AV data according to the present embodiment, in an interactive mode. In the present embodiment, the interactive data is implemented as a markup document written in a markup language and a markup resource linked to the markup document, which are divided into a plurality of ENAV units having a predetermined size or less.

ENAV unit refers to a buffering unit according to the present invention. That is, it refers to one of those divided into a predetermined size or less for the buffering of the interactive data. The ENAV unit includes at least one markup resource. The markup resource preferably includes at least one ENAV page. An ENAV page is implemented with only one markup document or with a markup document and at least one markup resource linked to the document. That is, an ENAV page refers to a data collection for displaying a markup document and an interactive screen in which all markup resources such as linked images, animations, asynchronous audio, and video are inserted and displayed. More specific data structure of the DVD 300 will be described later by embodiment.

The remote controller 400 receives a user's control command and transmits the control command to the playback apparatus 200. The reproduction device 200 is provided with a DVD drive for reading data recorded on the DVD 300. When the DVD 300 is loaded in the DVD drive and the user selects the interactive mode, the playback device 200 buffers the corresponding interactive data in units of ENAV units according to a predetermined order, and uses the buffered interactive data. Play in the interactive mode and transmit the data to the TV 100. In the TV 100, the AV screen is embedded in the interactive screen obtained from the interactive data and displayed together. The "interactive mode" refers to a method of outputting AV data to interactive data, that is, a display window defined in a markup document in this embodiment, that is, a method of displaying an AV screen embedded in an interactive screen. Here, the AV screen refers to a screen displayed on the display device by reproducing AV data, and the interactive screen refers to a screen displayed on the display device after the markup document (and markup resource) is interpreted. 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 corresponding AV data. In the present embodiment, the playback device 200 supports both the interactive mode and the video mode. In addition, the playback apparatus 200 may transmit and receive data by connecting to a network such as the Internet.

4 is a block diagram of a playback apparatus according to a preferred embodiment of the present invention.

Referring to FIG. 4, the playback apparatus supports an interactive mode in which an AV stream obtained by decoding AV data recorded on a DVD 300 according to the present embodiment is output through a display window defined by a markup document. A reader 2, an AV buffer 3, an ENAV buffer 4, an AV reproduction engine 5, a presentation engine 6 and a blender 7 are provided. The presentation engine 6 is provided with an ENAV buffer manager 61. The AV reproduction engine 5 is provided with an AV buffer manager 51.

The reader 2 reads AV data and interactive data recorded on the DVD 300. The ENAV buffer 4 is divided into a plurality of parts logically or physically to buffer the interactive data in units of ENAV units having a predetermined size or less. Buffering in ENAV units means reading and discarding interactive data in units of ENAV. The reason why the ENAV buffer 4 is divided into at least two parts is as follows. First, at least part of the operation of reading interactive data in units of ENAV units and discarding data stored in other parts can be simultaneously performed. Secondly, in order to manage the buffer more easily and efficiently, it is to avoid the difficulty of managing the dynamic buffer, which must remove some of the stored data in order to buffer the new data.

The presentation engine 6 is an interpretation engine that interprets markup languages and client interpretation programming languages, such as JavaScript, Java, and the like. In addition, the presentation engine 6 has a decoder for decoding markup resources, allowing the opening of markup resource files of various formats. In the interactive mode, the presentation engine 6 retrieves the markup document (and markup resources) from the ENAV buffer 4 and interprets the position of the display window for displaying the AV data stream output from the AV reproduction engine 5. Check it. The blender 7 blends with the AV data stream and outputs it to the TV 100 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 interactive screen.

In particular, according to the present invention, the ENAV buffer manager 61 controls the ENAV buffer 4 to read a predetermined ENAV unit according to a predetermined order, for example, before the corresponding AV data is displayed. As another example, the ENAV buffer manager 61 controls the ENAV buffer 4 to read the corresponding ENAV unit before the AV data is displayed by referring to the connection information described using the structure of the DVD-Video data. As another example, the ENAV buffer manager 61 controls the ENAV buffer 61 to read the corresponding ENAV unit before the AV data is displayed by referring to the connection information described using the reproduction time information of the AV data. . As such, the ENAV buffer manager 61 buffers the interactive data required before the AV data is reproduced, thereby stopping the buffering of the AV data in order to read the interactive data to be displayed together with the corresponding AV data. This can prevent data dropping.

FIG. 5 shows an embodiment of the ENAV buffer 4 of FIG. 4 and the relationship between the ENAV buffer 4 and the ENAV buffer manager 61.

Referring to FIG. 5, the ENAV buffer 4 has an audio buffer 41, an ENAV-unit buffer 42 and a basic buffer 43. The audio buffer 41 buffers audio data reproduced in synchronization with AV data, for example, the words of the producer (audio data) for a certain movie (AV data). The default buffer 43 does not need to buffer data such as font data or image data used for rendering the text referenced by the markup resource to the ENAV buffer as needed without relating to connection information with the AV data. Buffer used when present.

The ENAV-unit buffer 42 buffers ENAV pages in units of ENAV units. The ENAV unit includes at least one ENAV page as a group of data that must be read in advance at one time for seamless playback of AV data. If the size of the ENAV-unit buffer 42 is larger than the size of the interactive data recorded on the DVD 300, it is only necessary to read all the interactive data before starting the playback of the AV data. Therefore, it is necessary to specifically manage the buffering of the interactive data. However, as the size of the buffer increases, the size of the entire system is not only large but also increases the price, so the ENAV-unit buffer 42 has a constant size smaller than the size of the entire interactive data. In particular, the ENAV-unit buffer 42 according to the present embodiment is divided into two parts, logically or physically the same size, ENAV-unit buffer # 1 421 and ENAV-unit buffer # 2 422. .

In the present embodiment, the ENAV buffer manager 61 detects a time point at which the corresponding ENAV unit is switched to another ENAV unit when the AV data is reproduced, and the ENAV-unit buffer # 1 421 and the ENAV-unit buffer # 2 422 are detected. After either of the emptying, the next ENAV unit is buffered in the empty buffer. That is, while one ENAV unit stored in ENAV-unit buffer # 1 421 is being read, another ENAV unit stored in ENAV-unit buffer # 2 422 is discarded and another ENAV unit is discarded from ENAV-unit buffer # 2 422. The ENAV unit stored in ENAV-unit buffer # 1 421 is discarded while the newly stored ENAV unit is read in ENAV-unit buffer # 2 422 and the next ENAV unit is loaded into ENAV-unit buffer # 1 (421). Read with)

In the present embodiment, the ENAV-unit buffer consisting of two ENAV-unit buffers # 1 and # 2 has been described as an example, but basically, the same operation is performed in a model consisting of two or more ENAV unit buffers.

FIG. 6 shows the relationship between the AV buffer 3 and the AV buffer manager 51 of FIG.

Referring to FIG. 6, the AV buffer manager 51 controls the AV data to be buffered in the AV buffer 3, and the data buffered in the AV buffer 3 is output to the AV reproduction engine 5.

7 illustrates a buffer control method according to an embodiment of the present invention.

Referring to FIG. 7, in the present embodiment, the interactive data is divided into a plurality of ENAV units # 1, # 2, and # 3, and each of the ENAV units # 1, # 2, # 3, ... includes at least one ENAV page. do. These markup resources are the elements that make up the ENAV page. The present invention has a markup document index_unit # .. htm which is a certain special ENAV page.

At time A, the ENAV buffer manager 61 begins reading ENAV unit # 1 into ENAV-unit buffer # 1 421 and at time B starts reading ENAV unit # 2 into ENAV-unit buffer # 2 422. do. In this case, the viewpoint A and the viewpoint B are variously determined, and the viewpoint A does not necessarily have to precede the viewpoint B. The ENAV buffer manager 61 recognizes that the ENAV unit has been switched at time C and discards the ENAV unit # 1 stored in the ENAV-unit buffer # 1 421 and starts reading the ENAV unit # 3.

8 shows and illustrates an arrangement of interactive data on a disc according to an embodiment of the present invention.

The interactive data area 84 includes a general interactive data area 841, an ENAV UNIT # 1 842, an ENAV UNIT # 2 843, an ENAV UNIT # 3 844, and an ENAV UNIT #n 845.

As shown in FIG. 8, when the ENAV unit is read, the files in the ENAV unit are preferably written in contiguous space to minimize the file system reference.

9 illustrates a directory layout of interactive data on a disk according to an embodiment of the present invention.

9, it is preferable that one ENAV unit has a standardized directory name for the convenience of file management.

In other words, ENAV unit # 1 has file names and structures such as index_unit1.htm, unit1_1.htm, and unit1_2.htm, whereas ENAV unit # 2 has file names such as index_unit2.htm, unit2_1.htm and unit2_2.htm. Has a structure.

Referring to FIG. 10, one ENAV unit may be managed by a structured description file for the convenience of file management.

11 and 12 show examples of connection information for performing the buffer control method of FIG. 7 according to the first embodiment of the present invention.

Referring to FIG. 11, the startup file startup.htm or the schedule file startup.htm is shown in FIG. 12, is not displayed on the display device, that is, the TV 100, but indicates values of various parameters such as screen size and screen coloration. Play a role. The boxes marked by dotted lines in the startup file and the schedule file startup.htm indicate connection information according to the present embodiment. The connection information is implemented as information mapped with a PTS (Presentation Time Stamp), which is the reproduction time information of the DVD-Video corresponding to the ENAV unit. ENAV unit # 1 corresponds to PTS 0-9999 of DVD-Video, ENAV unit # 2 corresponds to PTS 10000-1999 of DVD-Video, ENAV unit # 3 corresponds to PTS 20000-N of DVD-Video . Accordingly, ENAV pages corresponding to ENAV unit # 1, that is, PTS 0-9999 are first loaded into ENAV-unit buffer # 1 421, and ENAV unit # 2, or PTS, is first loaded into ENAV-unit buffer # 2 422. ENAV pages corresponding to 10000-19999 are read, and ENAV pages corresponding to ENAV unit # 3, that is, PTS 20000-N, are read into ENAV-unit buffer # 1 421.

As such, the startup file or schedule file startup.htm contains connection information for the DVD-Video of ENAV units # 1, # 2, and # 3, which is made to have a size smaller than the size of the divided unit of the ENAV-unit buffer 42. Summarized all at once using PTS, the playback time information of DVD-Video.

FIG. 13 shows an example of synchronization information for performing the buffer control method of FIG. 7 according to the first embodiment of the present invention.

Referring to Fig. 13, a dotted line box of index_unit2.htm represents synchronization information according to the present embodiment. When the start page index_unit2.htm of ENAV unit # 2 is called by the user's navigation along an arbitrary path, the presentation engine 6 interprets index_unit2.htm to indicate the synchronization information, that is, the time when this document should be displayed. You know that it is PTS 10000 of Video. That is, the presentation engine 6 knows that the ENAV unit # 1 has been switched to the ENAV unit # 2 through the connection information obtained from the startup file startup.htm as described with reference to FIG. Accordingly, the ENAV buffer manager 61 issues a control command to empty the ENAV-unit buffer # 1 421 in which the ENAV unit # 1 is stored, and issues a control command to read the ENAV unit # 2. Subsequently, after the ENAV unit # 2 has been played back, and then the start page index_unit3.htm of the ENAV unit # 3 is called, the presentation engine 6 interprets the index_unit3.htm so that the synchronization information, that is, the point in time at which this document should be displayed, is displayed. While it is found that the DVD-Video is PTS 20000, the connection information obtained from the startup file startup.htm as described with reference to FIG. 7 indicates that the ENAV unit # 2 has been converted to the ENAV unit # 3. Accordingly, the ENAV buffer manager 61 issues a control command for emptying the ENAV-unit buffer # 2 422 in which the ENAV unit # 2 is stored, and issues a control command to read the ENAV unit # 3.

The control command to empty the buffer can be represented as 1) and the control command to read the ENAV unit can be represented as 2).

1) navigator.Discard ("ENAV_Unit N")

2) navigator.Preload ("ENAV_Unit N")

In the above control command, "ENAV_Unit" can indicate the name of a collection of files belonging to it or list all files belonging to it.

FIG. 14 illustrates a method of performing buffer control of FIG. 7 in accordance with a second embodiment of the present invention.

Referring to FIG. 14, ENAV unit # 2 corresponds to PTS 10000-19999 or logical block 10000-19999 of DVD-Video, and ENAV unit # 3 corresponds to logical block 20000-N to PTS 20000-N. ENAV unit # 2 has at least one ENAV page, which is composed of a start page 71 and the remaining ENAV pages 81. ENAV unit # 3 also has at least one ENAV page, which consists of a start page 72 and the remaining ENAV pages 82.

The start page 71 of ENAV unit # 3 has a predetermined unique name, start file name # 2, and the start page 72 of ENAV unit # 3 has a predetermined unique name, start file name # 3.

Thus, the presentation engine 6 can recognize that the conversion of the ENAV unit has been made when a file with a predetermined unique name is called. The ENAV buffer manager 61 may issue a control command to empty the buffer and read a new ENAV unit into the ENAV-unit buffer 42 as the ENAV unit is switched. If there are a plurality of start pages in the ENAV unit, only the start page indicating the switching of the ENAV unit has a predetermined unique name.

FIG. 15 illustrates a method of performing buffer control of FIG. 7 according to a third embodiment of the present invention.

Referring to FIG. 15, ENAV unit # 2 corresponds to PTS 10000-19999 or logical block 10000-19999 of DVD-Video, and ENAV unit # 3 corresponds to PTS 20000-N or logical block 20000-N. ENAV unit # 2 has markup documents index_unit2.htm, unit2_1.htm and unit2_2.htm corresponding to the ENAV page, and ENAV unit # 3 has markup documents index_unit3.htm, unit3_1.htm and unit3_2 corresponding to the ENAV page. has htm Here, the arrow indicates a path to which the user can navigate.

In this embodiment, the ENAV-unit buffer 42 is managed substantially in accordance with the intention of the producer. That is, the producer inserts control command information for controlling the ENAV-unit buffer 42 directly in every ENAV page to which the ENAV unit can be switched. For example, control command information for the ENAV-unit buffer 42 is recorded in the dotted box of the ENAV page of ENAV unit # 3 in FIG. 15 as follows.

navigator.Discard ("ENAV_Unit_Buffer1")

The presentation engine 6 interprets the called up markup document to recognize the control command information, and accordingly, the ENAV buffer manager 61 issues a corresponding control command to control the ENAV-unit buffer 42. Therefore, in the present embodiment, the presentation engine 6 only needs to support a control instruction such as navigator.Discard ("ENAV_Unit_Buffer1"). When the producer produces interactive data such that one ENAV unit is played back and the navigation path is set to the next ENAV unit, the producer clears the buffer and the next ENAV unit is read in advance before the corresponding AV data is played back, so that continuous playback of the AV data is prevented. Control command information shall be inserted to ensure this.

FIG. 16 is a diagram illustrating how much AV data should be read in order to read one ENAV unit of the present invention, and how large is the size for buffering the AV data.

Referring to Fig. 16, when the decoding speed at which AV data is consumed is Vo and the speed at which data is read from the disc is Vr, the time Te consumed for reading one ENAV unit is calculated. Assuming that the time taken for the pickup on the disk to move to the position of the ENAV unit is Tj and the size of one ENAV unit is Le, the time taken to read the ENAV unit is calculated as in Equation 1.

(Equation 1) Te = 2 x Tj + Le / Vr

In addition, since the ENAV unit should be read within the time when the AV data Lb stored in the AV buffer is exhausted, the following equation should be applied. If the AV data is filled in the AV buffer with Le or more, the AV data can be supplied to the AV playback engine without interruption even when the ENAV unit is read.

(Formula 2) Te <Lb / Vo

In addition, in order to fill the amount Lb of AV data stored in the AV buffer, at least Lr number of AV data blocks must be read from the disc so that the AV data Lb can be filled.

(Formula 3) Lb <(Vr Vo) x (Lr / Vr)

(Lr> (Lb x Vr) / (Vr Vo)

Since Lb> Te x Vo from Equation 2, substituting this in Equation 3,

(Equation 4) (Lr> (Te x Vo x Vr) / (Vr Vo)

Then, if Te of Formula 1 is substituted into the above formula,

(Equation 5)) (Lr> ((2 x Tj + Le / Vr) x Vo x Vr) / (Vr Vo)

Becomes If Tj, le, Vr, and Vo are all determined values, the minimum value of Lr can be obtained.

Also, the time required to read Lr (Tr) should be applied as the following formula.

(Equation 4) Tr = Lr / Vr

Assuming that Vr, Vo, Le, and Tj are predetermined values, the following Te, Lb, Lr, and Tr are calculated using the above formula.

Vr 22.16 Mbps (= 22,160,000 bps) Vo 10.08 Mbps (= 10,080,000 bps) Le 2 Mbytes (= 16,777,216 bits) Tj 1,000 msec Te 1,000 msec x 2 + 758 msec = 2,758 msec Lb 2,758 x 10,080 = 27,800,640 bits Lr 50,998,526 bits => 3113 blocks (= 194 ECC blocks) Tr 2,995 msec (calculated as the number of ECC blocks)

(* 1 block is 2048 bytes and 16 blocks are assumed to be 1 ECC blocks)

Here, it is assumed that one block is 2048 bytes, and 16 blocks are 1Ecc blocks.

Therefore, the minimum AV data to be read in order to read the ENAV unit and the next ENAV unit should be data of 194 ECC blocks (6.2 MBytes).

As described above, according to the present invention, when the AV data is reproduced in the interactive mode, the interactive data is stored in a plurality of ENAV units, and when the corresponding ENAV unit is switched when the predetermined AV data is reproduced, the buffer is emptied and the switched ENAV unit is switched. The buffer is managed in a pre-read manner to ensure the seamless playback of AV data.

Claims (46)

AV data; And Interactive data for reproducing the AV data in the interactive mode is stored, And the interactive data includes a plurality of ENAV units having a predetermined size or less. The method of claim 1, And the ENAV unit is recorded in a contiguous space on the information storage medium. The method of claim 1, And wherein the interactive data includes connection information between the AV data and the ENAV unit described using the structure of the AV data. The method of claim 1, And wherein the interactive data includes connection information between the AV data and the ENAV unit described using the reproduction time information of the AV data. The method of claim 1, And wherein the interactive data includes connection information between the AV data and the ENAV unit described using the reproduction position information of the AV data. The method of claim 1, And the ENAV unit includes at least one markup resource. The method of claim 4, wherein The ENAV unit includes at least one ENAV page composed of markup resources, Information storage medium, characterized in that the synchronization information indicating when each ENAV page should be displayed. The method of claim 4, wherein And the markup document comprises a startup file in which the connection information of the markup resource is recorded. The method of claim 4, wherein And the markup document comprises a schedule file in which the connection information of the markup resource is recorded. The method of claim 8, And the corresponding synchronization information is recorded in the ENAV page composed of the markup resources, respectively. The method of claim 9, And the ENAV page is configured through a markup document. The method of claim 8, The AV data is DVD-Video data, And the connection information and the synchronization information are described using a presentation time stamp of the DVD-Video data. The method of claim 8, The AV data is DVD-Video data, And said connection information and synchronization information are described using logical block position information of said DVD-Video data. AV data; And Interactive data for reproducing the AV data in the interactive mode is stored, The interactive data is divided into a plurality of ENAV units having a predetermined size or less, and the start page of each ENAV unit is stored under a predetermined start file name. AV data; And Interactive data for reproducing the AV data in the interactive mode is stored, The interactive data is divided into a plurality of ENAV units having a predetermined size or less, and each ENAV unit is stored under a predetermined directory file name. The method of claim 14, The ENAV unit includes at least one ENAV page, And the start page is any one of the ENAV pages. The method of claim 14, And wherein the interactive data includes a markup document and a markup resource linked to the markup document. The method of claim 14, And the AV data is DVD-Video data. AV data; And Interactive data for reproducing the AV data in the interactive mode is stored, The interactive data includes at least one ENAV page, And the control command information for the ENAV buffer for buffering the ENAV page is recorded in the ENAV page. The method of claim 19, And the control command information is information for instructing to discard the data stored in the ENAV buffer. The method of claim 19, The interactive data is divided into a plurality of ENAV units including the ENAV page. The method of claim 21, The control command information is information storage medium characterized in that the command to discard the ENAV unit stored in the ENAV buffer and to read the next ENAV unit. An apparatus for playing back AV data in an interactive mode, An ENAV buffer for buffering interactive data for reproducing the AV data in an interactive mode, divided into a plurality of ENAV units having a predetermined size or less; And And an ENAV buffer manager for controlling the ENAV buffer to read and discard the interactive data in units of ENAV units. The method of claim 23, wherein And the ENAV buffer is composed of a plurality of ENAV unit buffers. The method of claim 23, wherein The ENAV buffer manager And controlling the ENAV buffer to read an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the structure of the AV data. . The method of claim 23, wherein The ENAV buffer manager And controlling the ENAV buffer to read an ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the reproduction time information of the AV data. Device. The method of claim 23, wherein The ENAV buffer manager And the ENAV buffer is controlled to read the corresponding ENAV unit with reference to the synchronization information recorded in the markup document corresponding to each ENAV page included in the ENAV unit. The method of claim 27, The ENAV buffer manager And the ENAV buffer is controlled to read a corresponding ENAV unit with reference to the synchronization information and the connection information between the AV data and the ENAV unit. The method of claim 28, The interactive data includes a markup document and a markup resource linked to the markup document, The markup document includes a startup file in which the connection information is recorded. And the synchronization information is recorded in each markup document corresponding to the ENAV page. The method of claim 28, The AV data is DVD-Video data, Wherein the connection information and synchronization information are described using a presentation time stamp of the DVD-Video data. The method of claim 28, The AV data is DVD-Video data, And said connection information and synchronization information are described using logical block information of said DVD-Video data. An apparatus for playing back AV data in an interactive mode, An ENAV buffer for buffering interactive data for reproducing the AV data in an interactive mode, divided into a plurality of ENAV units having a predetermined size or less; And And an ENAV buffer manager for controlling the ENAV buffer to read a corresponding ENAV unit when a start page with a predetermined file name is found. An apparatus for playing back AV data in an interactive mode, An ENAV buffer for buffering interactive data for reproducing the AV data in an interactive mode, divided into a plurality of ENAV units having a predetermined size or less; And And an ENAV buffer manager for controlling the ENAV buffer to read a corresponding ENAV unit when a directory of a predetermined name is found. 33. The method of claim 32, The ENAV unit includes at least one ENAV page, And the start page is any one of the ENAV pages. 33. The method of claim 32, The interactive data includes a markup document and a markup resource linked to the markup document. In the method of playing the AV data in the interactive mode, (a) buffering the interactive data for reproducing the AV data in the interactive mode by reading and discarding the interactive data in units of ENAV units having a predetermined size or less; And (b) playing the AV data in interactive mode using buffered interactive data. The method of claim 36, Step (a) is And reading the ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the structure of the AV data. The method of claim 36, Step (a) is And reading the ENAV unit before the corresponding AV data is displayed by referring to the connection information between the AV data and the ENAV unit described using the reproduction time information of the AV data. . The method of claim 36, Step (a) is And reading the corresponding ENAV unit with reference to the synchronization information recorded in the markup document corresponding to each of the ENAV pages. The method of claim 39, Step (a) is And reading the corresponding ENAV unit with reference to the synchronization information and the connection information between the AV data and the ENAV unit. The method of claim 40, The interactive data includes a markup document and a markup resource linked to the markup document, The markup document includes a startup file in which the connection information is recorded. And the synchronization information is recorded in each markup document corresponding to the ENAV page. The method of claim 41, wherein The AV data is DVD-Video data, Wherein the connection information and synchronization information are described using a presentation time stamp of the DVD-Video data. The method of claim 41, wherein The AV data is DVD-Video data, Wherein the connection information and synchronization information are described using logical block information of the DVD-Video data. The method of claim 1, The amount of AV data Lr to be read in order to seamlessly read one ENAV unit is represented by the following equation; Lr> ((2 x Tj + Le / Vr) x Vo x Vr) / (Vr Vo) Where Tj is the amount of time the pickup on the disc takes to read the ENAV unit, Le is the size of the ENAV unit, Vr is the speed at which the AV data is read from the disc, and Vo is the decoding speed at which the AV data is consumed. Information storage medium characterized by: The method of claim 23, wherein The amount of AV data Lr to be read in order to seamlessly read one ENAV unit is represented by the following equation; Lr> ((2 x Tj + Le / Vr) x Vo x Vr) / (Vr Vo) Where Tj is the amount of time the pickup on the disc takes to read the ENAV unit, Le is the size of the ENAV unit, Vr is the speed at which the AV data is read from the disc, and Vo is the decoding speed at which the AV data is consumed. Device, characterized by. The method of claim 36, The amount of AV data Lr to be read in order to seamlessly read one ENAV unit is represented by the following equation; Lr> ((2 x Tj + Le / Vr) x Vo x Vr) / (Vr Vo) Where Tj is the amount of time the pickup on the disc takes to read the ENAV unit, Le is the size of the ENAV unit, Vr is the speed at which the AV data is read from the disc, and Vo is the decoding speed at which the AV data is consumed. Obtained by the method.