KR100636211B1 - AV data reproducing apparatus and method which containing memory management table, and memory management method therein - Google Patents

Abstract

Disclosed are an AV data reproducing apparatus and a reproducing method including a memory management table for finding and releasing memory when the memory used in the application program is not terminated even after the application program is terminated. According to the present invention, an apparatus for reproducing an information storage medium including AV data and application data comprises: a presentation engine for reproducing the AV data; And a program engine for reproducing the application data and including a memory management table for managing a memory used for reproducing the application data. This makes it possible to efficiently use the memory of the AV data reproducing apparatus by finding and releasing memory that has not been canceled even after the application is terminated.

Description

AV data reproducing apparatus and method, including memory management table, and method for managing memory used therein {AV data reproducing apparatus and method which containing memory management table, and memory management method therein}

1 is a diagram showing the type of data recorded on an information storage medium according to the present invention;

2 is a diagram illustrating a life cycle of an Xlet;

3 is a diagram illustrating an example of an application program including destroyXlet () for releasing memory used in an application;

4 is a diagram showing an example of the HScene management table according to the present invention;

5 is a flowchart of a method of releasing a memory using the HScene management table according to the present invention;

6 is a block diagram of an AV data reproducing apparatus using the memory release method according to the present invention.

The present invention relates to memory management of an AV data reproducing apparatus, and more particularly, to an AV data reproducing apparatus including a memory management table for finding and releasing a memory used in an application program when the memory used in the application program is not terminated even after the application program is terminated. The present invention relates to a playback method and a memory management method used therefor.

Recently, a playback apparatus for reproducing high quality video data receives and plays various multimedia data as well as playback of video and audio data. Therefore, a mass storage medium such as a DVD contains various data in addition to the video and audio data, and development of a playback device capable of reproducing such various data together with the video / audio data is being developed. On the other hand, these various types of data are read by an application program implemented using a programming language such as Java and displayed to the user.

In addition, since the playback apparatus has limited resources such as memory, unlike the PC, after the application program uses the resources of the playback apparatus, it must be released before other application programs can use the resources. However, if there is no code for releasing resources after the application program terminates, the resources of the playback device are quickly exhausted.

Accordingly, the technical problem to be achieved by the present invention is to use a table for managing the memory that is not terminated when the application is terminated, and when the application is terminated AV data playback apparatus and playback method for resolving the remaining memory with reference to the table and this It is to provide a memory management method used.

In particular, the present invention provides an AV data reproducing apparatus and a reproducing method which increase the efficiency of memory use by managing HScene, which must be used by an application to show an application execution screen, through the table.

According to an aspect of the present invention, there is provided an apparatus for reproducing an information storage medium including AV data and application data, the apparatus comprising: a presentation engine for reproducing the AV data; And a program engine for reproducing the application data and including a memory management table for managing a memory used for reproducing the application data.

The program engine may further include an application manager for controlling reproduction of the application data, and referring to the memory management table, it is preferable to find and terminate the memory which has not been canceled even after the reproduction of the application data remains.

Preferably, the application data is an application program written in Java or an application program implemented in Xlet, and the memory management table preferably stores HScene information used to display a reproduction result of the application data on the screen. .

On the other hand, according to another aspect of the present invention, the technical problem is a method of reproducing an information storage medium including AV data and application data, (a) reproducing the AV data; And (b) reproducing the application data as well as reproducing the AV data, and recording memory related information in a memory management table for managing a memory used for reproducing the application data. This is also achieved by a regeneration method.

In the step (b), it is preferable to replay the application data and find and terminate the memory which has not been canceled even after the reproduction of the application data remains with reference to the memory management table.

In addition, the technical problem is a memory management method of an information storage medium playback apparatus including AV data and application data, (a) screen information management table (HScene) information used to display the reproduction result of the application data; Storing in; And (b) after the reproduction of the application data ends, referring to the screen information management table, determining whether the screen information remains and deleting the screen information.

Preferably, the screen information management table is an HScene management table, and the application data is preferably an application program written in Java or an application program implemented in Xlet.

In the step (b), it is preferable to delete the HScene number by calling the dispose () function of the Xlet.

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

1 is a diagram showing the type of data recorded on an information storage medium according to the present invention.

Referring to FIG. 1, an information storage medium 100 according to the present invention includes video data 110, application data 120 (hereinafter abbreviated as application data) for a programming function, and system data 130. .

The moving image data 110 is data of a reproduction mode for reproducing a moving image, also referred to as core mode or movie mode data. The moving picture data includes compressed coded AV data and navigation data for controlling reproduction of the AV data. Accordingly, the AV data may be reproduced by referring to the navigation data of the information storage medium, and the user may watch a video such as a high definition movie.

On the other hand, the application data 120 is data having a program function for providing an interactive function with a user, also referred to as full mode data or program mode data. Game functions using video, the ability to display Director's Commentary while playing part of a video, the display of other additional information while playing part of a video, or the ability to chat while playing a video Various applications that provide the data are recorded as application data. Alternatively, related information such as the latest news about a movie actor, a news event held about a movie, or an updated subtitle related to a movie recorded on an information storage medium may be downloaded by the application. You can also play together.

In addition, the application data may include an API (Application Program Interface) function for the presentation engine that reproduces the video information, which will be described later, to execute the application program together with the video. Such application data is written in a programming language such as C or Java (JAVA), and the present invention will be described mainly with a JAVA application such as Xlet. Xlet refers to a Java application running on a digital TV receiver.

On the other hand, the system data 130 includes startup information and title information. The startup information informs the position information of the data to be first reproduced when the information storage medium is reproduced by the reproducing apparatus. Title information represents entry and attribute information of data that should be operated upon reproduction of each title.

Therefore, the content producer provides an application program capable of providing various information together with the AV data in an information storage medium, and the playback apparatus for reproducing the content includes a reproduction engine for the AV data and a reproduction engine for reproducing the application program. Have.

The application program is mainly implemented in Java, and unlike PC, Sun (SUN) provides Xlet to execute Java in AV data player using limited memory and limited resources. Java applications that run in a web browser are called applets, while TV applications are called Xlets. The applet loads and runs when the user visits the page that contains the applet, and stops and disappears when you navigate to another page. Similarly, the Xlet is loaded and executed when the user of the AV data player selects a service including the Xlet, and stops and disappears when another service is selected. The life cycle of the Xlet is as shown in FIG. 2.

2 is a diagram illustrating a life cycle of an Xlet.

The Xlet consists of four states: Loaded (210), Paused (220), Active (230), and Destroyed (240). Is switched over. Loaded 210 is a state where the Xlet is loaded and not initialized yet, and Paused 220 is a state where the Xlet is initialized and stopped. In the Paused 220 state, no shared resources can be preempted or used. The Active 230 state is a state in which the Xlet has a general function and provides a service. This state comes in after Paused (220) returns the startXlet () method. Destroyed (240) state is the state that the Xlet has returned all resources.

The above-described Xlet interface informs the application manager of the AV data reproducing apparatus of the life cycle state change. initXlet () initializes the Xlet, which signals the application manager to initialize the Xlet itself. After the execution of startXlet (), the Xlet is switched to the Active 230 state. The Xlet provides services and acquires resources in this state. pauseXlet () notifies the Xlet of a signal to stop the providing service. destroyXlet () signals that the Xlet is no longer needed and will soon be removed from the system. Before destroying, the Xlet uses destroyXlet () to do things like return resources, save references, and save state.

3 is a diagram illustrating an example of an application program including destroyXlet () for releasing memory used in an application.

Therefore, the content producer implements each interface, and the playback engine of the playback apparatus controls the application according to the implemented contents. When the application starts, the playback engine loads the resources used by the application into memory and, when the application exits, frees the memory that was used by the application. This process proceeds according to the programming of the content creator's Xlet interface, and the playback engine simply performs operations determined according to the contents of the Xlet interface.

However, if the application does not program code that frees used memory, i.e. in destroyXlet () that is called at the end of the application, it does not contain instruction code that frees used memory, the memory is It will still remain in use. Unlike a PC, in a playback device having only limited memory, if the memory remains unresolved, there may be a case where the lack of memory makes it impossible to continue executing other applications provided by the content creator. Since the playback apparatus simply executes the application, this problem cannot be solved.

4 is a diagram illustrating an example of the HScene management table according to the present invention.

HScene is for the application to provide the application execution results on the screen. HScene calls a function called dispose () to release the memory used for HScene. However, if the content creator does not create an application program to include the destroyXlet () interface as shown in FIG. 3, the HScene's memory used by the application remains unresolved, allowing other applications to use that area of memory. It becomes impossible. Unlike the PC, the playback device has limited memory. Therefore, the memory area of HScene that has not been canceled may cause insufficient memory, and other applications may not run smoothly. Therefore, to prevent this, when the playback device terminates the application or the title is terminated, if the dispose () of the used HScene is not called, the function is called to free the memory used for the HScene.

The application manager controlling the operation of the application releases the memory of the HScene corresponding to the terminated application through the HScene management table as shown in FIG. The management table is divided into application ID and HScene number. How to use the HScene management table is as follows.

When a content creator creates an application with an Xlet, each application contains an XletContext object that sets its own operating environment. XletContext contains the application ID information of the application. When the application is executed, the application stores the application ID stored in the XletContext and the generated HScene object information in the HScene management table while creating the HScene object. In this case, the HScene object information may use an HScene object ID or a predetermined identifier indicating the HScene object. If an application calls dispose () to terminate an HScene object while it is running, it deletes the application ID and HScene information contained in the HScene management table in that function.

When the application is terminated, the application manager checks the HScene management table and, if there is an HScene object with the ID of the terminated application, calls the dispose () function to remove the remaining HScene object. The above process is summarized with reference to FIG. 5 as follows.

5 is a flowchart of a method of releasing memory using the HScene management table according to the present invention.

When the application is terminated, the HScene management table is searched for (S510). It is determined whether the HScene corresponding to the terminated application ID exists (S520), and if present, the HScene of the corresponding ID is deleted (S530).

6 is a block diagram of an AV data reproducing apparatus using the memory release method according to the present invention.

Referring to FIG. 6, the reproducing apparatus is a reproducing unit 610 which reads data from the information storage medium 600, buffer units 620 to 623 which temporarily store the read data, and an engine for reproducing the buffered data. Sections 625 through 634. The playback unit reads the system data, and the module manager 633 controls the navigation engine to handle title changes resulting from initial execution, user selection, or navigation change, and a navigation engine 631 that controls playback of a video according to the contents of the navigation data. ), A presentation engine 632 for decoding the video data and outputting it to a screen, and a program engine 630 for executing an application program. Depending on the type of application, a plurality of program engines may be used. For example, to play Java and HTML applications together, you need a Java virtual machine that can run Java applications and a browser engine that can run applications in HTML. The HScene management table of the present invention is included in the program engine 630, and when the application is terminated, the memory of the program engine is released at that time.

In addition, the blender 634 is further added so that the execution result of the application of the program engine 630 and the reproduction result of the video data of the presentation engine 632 are overlayed to form one screen. Furthermore, the program engine 630 preferably further includes an application manager 625 that controls the execution of the application program using the application object to provide a program function.

In addition, the playback apparatus according to the present invention includes a local storage 601 to store the program application downloaded from the information storage medium 600 or the external database 602. Accordingly, the module manager 633 creates a virtual file system according to the above description with reference to FIG. 5 with the data read from the information storage medium 600 and the data read from the local storage 601. Accordingly, the program engine 630 and The reproduction control information is transmitted to the navigation engine 631.

On the other hand, the above-described memory release 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. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement a memory release method. The information storage medium includes a magnetic recording medium, an optical recording medium, and a carrier wave medium.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

As described above, according to the present invention, there is an effect that the memory of the AV data reproducing apparatus can be efficiently used by finding and releasing memory that has not been canceled even after the application is terminated.

Claims (15)

A playback apparatus of an information storage medium including AV data and application data, A presentation engine for reproducing the AV data; And A program engine for reproducing the application data, the program engine including a memory management table for managing a memory used for reproducing the application data; And the program engine refers to the memory management table and finds and cancels any memory that has not been canceled even after the reproduction of the application data ends. delete The method of claim 1, wherein the application data is A playback device characterized in that the application program written in Java or an application program implemented in Xlet. The memory management table of claim 1, wherein the memory management table comprises: And HScene information used to display a reproduction result of the application data on a screen. The memory management table of claim 4, wherein the memory management table comprises: An application ID for identifying the application program; And And a HScene number provided corresponding to the application ID. In a method of reproducing an information storage medium including AV data and application data, (a) playing the AV data; And (b) reproducing the application data, in addition to reproducing the AV data, and recording memory related information in a memory management table for managing a memory used for reproducing the application data; The step (b) of the present invention, characterized in that by retrieving the memory that has not been canceled even after the reproduction of the application data remains, referring to the memory management table. delete The method of claim 6, wherein the application data is Playback method characterized in that the application program written in Java or an application program implemented in Xlet. The memory management table of claim 6, wherein the memory management table comprises: And HScene information used for displaying the reproduction result of the application data on the screen. 10. The system of claim 9, wherein the memory management table is An application ID for identifying the application program; And And a HScene number provided corresponding to the application ID. In the memory management method of the information storage medium playback apparatus including AV data and application data, (a) storing screen information (HScene) used to display a result of reproduction of the application data in a screen information management table; And and (b) after the reproduction of the application data is completed, referring to the screen information management table, determining whether the screen information remains and deleting the screen information. The method of claim 11, And the screen information management table is an HScene management table. The method of claim 11, wherein the application data is Memory management method characterized in that the application program written in Java or an application program implemented in Xlet. The table information management table of claim 11, wherein An application ID for identifying the application program; And And a HScene number provided corresponding to the application ID. The method of claim 14, In the step (b), the dispose () function of the Xlet is called to delete the HScene number.

Images