KR20060082336A - Information storage medium storing navigation command which enables random access of av stream, reproducing method and apparatus thereby - Google Patents

Abstract

Disclosed are an information storage medium recording a navigation command for enabling access to a specific point in time of an AV stream, and a method and apparatus for reproducing an AV stream. According to the present invention, a method for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream includes: (a) a reproduction order of a recording unit including the AV stream as a first variable of the navigation command; Reading an identifier of a playback unit containing information to be controlled; (b) reading, as a second variable of the navigation command, a reproduction start time designated by referring to a time map in which a position of a specific picture among pictures constituting the AV stream is recorded in the reproduction unit; And (c) reading and reproducing from the corresponding position of the recording unit corresponding to the identifier of the reproduction unit and the reproduction start time. As a result, the playback position of the AV stream can be controlled more precisely, and various angles of the video are displayed in various screens smaller than the main screen, thereby making it possible to enlarge the scene of the angle that the user wants to see.

Description

Information storage medium storing a navigation command for enabling random access of an AV stream, and a method and apparatus for reproducing the AV stream according to the same.

1 is a view for explaining the structure of multimedia data recorded on an information storage medium of the present invention;

2 is a diagram illustrating a playback screen of an AV stream including a plurality of multi-angle video.

FIG. 3 is a diagram showing the configuration of a plurality of AV streams made from a video of several angles as a main video;

4A to 4B show a relationship between a playlist and an AV stream;

5A to 5D are diagrams for explaining moving of a playback position according to a user's selection;

FIG. 6 is a view showing that AV streams of various angles are interleaved and recorded;

7 is a flowchart of a method for reproducing an AV stream in accordance with a navigation command enabling random access of the AV stream according to the present invention;                 

8 is a block diagram of an apparatus for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream according to the present invention.

The present invention relates to an information storage medium for recording a navigation command for controlling playback of an AV stream, and more particularly to a playback of an AV stream. More specifically, an information storage medium for recording a navigation command for accessing a specific point in time of an AV stream is provided. The present invention relates to a method and an apparatus for reproducing an AV stream.

In order to randomly change or jump the playback position during playback of the information storage medium on which the AV stream has been recorded, the predetermined playback unit constituting the AV stream is further divided to start playback from the start position of the playback unit corresponding to the randomly changed point. There is a method of starting or playing a specific mark (mark) at regular intervals within the playback unit to start playback from the position where the specific mark is located.

However, since there are limitations in dividing the playback units, it is not possible to perform fine control such as controlling playback in the GOP (Group of Picture) unit of the encoded AV stream, and when the mark is inserted, the size of the AV stream increases. There is a problem.

Therefore, the technical problem to be achieved by the present invention is to control the playback in more detail, and to access a specific time point of a time map in which the location of a specific picture is recorded among the pictures constituting the AV stream so as not to increase the size of the data. An information storage medium having a navigation command recorded thereon, and a method and apparatus for reproducing an AV stream.

According to the present invention, there is provided a method for reproducing an AV stream according to a navigation command that enables random access of an AV stream, the method comprising: (a) recording the AV stream as a first variable of the navigation command; Reading an identifier of a playback unit containing information for controlling the playback order of the units; (b) reading, as a second variable of the navigation command, a reproduction start time designated by referring to a time map in which a position of a specific picture among pictures constituting the AV stream is recorded in the reproduction unit; And (c) reading and reproducing from the corresponding position of the recording unit corresponding to the identifier of the reproduction unit and the reproduction start time.

Preferably, the playback unit is a playlist including information on the playback order of the AV stream, and the playback start time is a PTS value representing the playback start time of the AV stream.

When the button object included in the recording unit corresponding to the identifier of the playback unit is selected and executed, the PTS value is preferably determined by acquiring the PTS value at that time.

Preferably, the AV stream is interleaved and recorded with a plurality of angles of the AV stream.

Meanwhile, according to another aspect of the present invention, the technical problem is an information storage medium in which a navigation command for enabling random access of an AV stream is recorded, wherein the navigation command is a playback order of a recording unit including the AV stream. An identifier of a playback unit containing information to be controlled; And an information storage medium for recording a navigation command, characterized in that the playback start time is designated as a variable in reference to a time map in which the position of a particular picture among the pictures constituting the AV stream is recorded. .

According to another aspect of the present invention, there is provided an apparatus for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream, wherein the AV stream includes the AV stream as a first variable of the navigation command. The time of reading the identifier of the reproduction unit containing the information controlling the reproduction order of the recording unit, and recording the position of a specific picture among the pictures constituting the AV stream in the reproduction unit as the second variable of the navigation command. A navigation engine that reads a specified playback start time by referring to a map; And (c) a presentation engine which reads and reproduces from the corresponding position of the recording unit corresponding to the identifier of the reproduction unit and the reproduction start time.

According to another aspect of the present invention, there is provided a method for reproducing an AV stream according to a navigation command that enables random access of an AV stream, wherein (a) a video of one angle is used as a main video, Reading and playing an AV stream created by embedding at least one video of another angle as a video having a smaller size than the main video at a part of the main video; And (b) when a button object assigned to each position of the video of the other angle is executed during playback of the AV stream, a corresponding navigation command is executed to execute a video of another angle corresponding to the button object. The present invention is also achieved by a reproduction method comprising the step of reading and reproducing an AV stream created in the above.

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

1 is a view for explaining the structure of multimedia data recorded on the information storage medium of the present invention.

Referring to FIG. 1, the multimedia data recorded on the information storage medium according to the present invention includes a recording unit 110 including an AV stream to be reproduced and attribute information of the AV stream, and a playback order and reproduction position of the recording unit. The playback unit 120 including the playlist information to be defined is included. The recording unit 110 includes a button object including a navigation command according to the present invention, and the playback unit 120 includes a time for accessing a GOP (Group of Picture) position of the recording unit indicated by the playback unit. It includes a time map, which is information.

The navigation command included in the button object to start reproduction at a specific position of the recording unit 110 can be made as follows, for example. That is, a navigation command "Play PLatST" can be created in the sense of playing back a recording unit indicated by a specific playback unit (for example, a playlist) at a specific time point (Play PlayList at Specified Time). This navigation command starts playback at the time position according to the time variable specified in the playlist. That is, "Play PLatST" has a playlist identifier and a PTS value as variables. Therefore, the usage format of this navigation command is "Play PLatST (playlist ID., PTS)".

The PTS value can be determined using the PTS value of the intra picture among the GOPs of the MPEG stream constituting the clip AV stream. In general, since a playback apparatus that plays back an MPEG stream can play a video while moving the playback position based on the PTS value of the intra picture, the present invention randomly plays back the PTS value of the intra picture for random playback. . On the other hand, the identifier of the playlist can be assigned in advance when the information storage medium including the AV stream is produced.

In addition, the PTS value may be predetermined as an identifier of a playlist or may be determined by user input. The allocation of PTS values by user input will be described below. In the conventional method for reproducing a particular time point of an AV stream by a user operation, a user inputs a specific time by a menu provided by the reproducing apparatus, and is reproduced from the corresponding time point of the AV stream according to the input time. However, in the case of the conventional navigation command, since the user's input cannot be accepted, the producer of the information storage medium should record and record all the variable values used for the navigation command in advance at the time of production of the information storage medium. In the case of the PTS variable used in the navigation command according to the present invention, the playback device can be assigned by referring to the PTS value at the time when the navigation command is executed from a register or the like of the playback device.

In the application example using the above-described navigation command of the present invention, a screen made by including a video taken from various angles as part of the main video is provided, and the video of the desired angle is converted into the main video and played according to a user's selection. I can think of doing. The video, which is provided as a small sized image along with the main video, is similar to a picture in picture (PIP), but unlike the PIP, each video is embedded in the main video rather than an independent video. The following describes an application example using the navigation command of the present invention.

2 is a diagram illustrating a playback screen of an AV stream including a plurality of multi-angle video.

Referring to FIG. 2, it can be seen that a video taken at various angles is separately made and provided to the user as a single video embedded in a part of the main video in one screen. That is, although a plurality of moving images appear to be played to the user, one main video stream is actually being played. However, as described above, in order to give the user the effect that a plurality of selectable videos representing each multi-angle are provided like a PIP, a button object that can be performed in accordance with the angle video portion of the main stream screen is produced. .                     

And while watching the main video, if the user wants to watch a video of another angle as the main video, the user clicks it. Then, the navigation command corresponding to the video of the selected angle is performed. As described above, the navigation command has a playlist identifier and a PTS value as variables, and the navigation command reads them, moves to the PTS viewpoint of the playlist, and starts playback of the AV stream. The AV stream corresponding to this playlist is an AV stream made from the video selected by the user as the main video.

In other words, a button object designed to give users the same effect as selecting a different angle video displayed on the screen at a smaller size and switching to a larger screen, but actually selecting an angle video displayed at a smaller size. Is clicked to execute, and thus the navigation command according to the present invention assigned to the button object is executed. That is, it is the user's position that the angle video clicked by the user is selected, and in reality, the navigation command is executed by selecting a button object made to match the angle video portion.

FIG. 3 is a diagram showing the configuration of a plurality of AV streams made from a video of several angles as a main video.

In other words, create an AV stream 0 (310) consisting of an angle 0 video as the main video and the remaining angle video as PIP-like small images, and separately from the angle 1 video as the main video. An AV stream 1 320 is formed of a small video of a video similar to a PIP. This process is performed for all angles of motion pictures, up to AV stream 5 (330). Then, the user selects and plays an AV stream whose main video is a moving picture of the selected angle. That is, in the case where AV stream 0 310 is being played back, for example, when a video of angle 1 is to be viewed as the main video, when the position of the video of angle 1 is clicked on, the AV stream 1 (the angle 1 is made into the main video) The playback position jumps to 320 to play.

4A to 4B are diagrams showing a relationship between a playlist and an AV stream.

A navigation command is assigned to the button object, and when the user clicks the button, the navigation command assigned thereto is performed to move the playback position. FIG. 4A illustrates an embodiment in which a maker of an information storage medium inputs a time value from a variable of a navigation command assigned to a button object in advance. Preferably, each time value is assigned a PTS value in which the corresponding button object is displayed. Therefore, the valid period of each button object is from the PTS of the intra picture of the GOP from which the corresponding button object is displayed until the PTS of the intra picture of the next GOP.

4B illustrates a case of automatically allocating a time value among variables of a navigation command assigned to a button object. When a corresponding button object is selected and executed by a user, a PTS value of a current time point is obtained and determined as a PTS value of a navigation command. For example, the PTS value may be a presentation time value of a playback status register that stores current playback status information among player status registers of the playback apparatus. As a result, there is no need to create a plurality of button objects, so that the amount of data in the AV stream does not increase significantly. In this case, the validity period of the button object is from the reproduction start to the reproduction end of the playlist.

5A to 5D are diagrams for explaining moving of a playback position according to a user's selection.

First, as shown in FIG. 5A, playlist # 0 for playing angle 0 as a main video is executed by the user. Next, as shown in FIG. 5B, the user moves and selects the button object through the user input device to play the playback of another angle displayed in the form of a small window as the main video. Then, the button object representing the specific angle is clicked. Then, the navigation command assigned to the button object is executed. For example, Play PLatST (# 1, PTS) is executed. Accordingly, as shown in FIG. 5C, the AV stream # 0 is played, and as shown in FIG. 5D, the playlist # 1 is selected, and with reference to the time map included in the playlist, The playback of the AV stream # 1 starts from the point of time at the PTS. A time map is a table which records the position of every intra picture of the GOP unit which comprises an AV stream. The PTS is used to ensure a seamless playback when the angle is switched to the PTS at the point where the current button object is clicked.

FIG. 6 is a diagram showing that AV streams of various angles are interleaved and recorded.

As described above, when another AV stream at a specific point in time is played by the user's request in the playback of an AV stream referred to by a playlist representing one angle, a buffer model of the playback apparatus for this to ensure continuous playback. In consideration of this, each AV stream is divided into equal sizes and recorded in an information storage medium in an interleaved form as shown in FIG. That is, the AV stream # 0, the AV stream # 1, and the AV stream # 5 are divided into blocks of the same size, and the divided blocks are interleaved together with other AV streams in the same time zone and recorded as one stream.

On the other hand, in some cases, the user may not want to display a video of another angle displayed along with the main video, so that the producer may separately prepare an AV stream and a playlist for each angle not including the PIP. These AV streams contain hidden buttons that can be executed by pressing a specific selection key to switch playback to AV streams and playlists that display videos from different angles at any time, or at the user's request. It can also be produced by including a pop-up button including a button that can be switched to.

7 is a flowchart of a method for reproducing an AV stream according to a navigation command enabling random access of the AV stream according to the present invention.

The identifier of the playback unit to be played back is read out in the predetermined playback unit constituting the AV stream (S710). In addition, the playback start time in the playback unit is read (S720). As an example of such a process, when the user performs an operation such as clicking on a button object, the user executes "Play PLatST (# 1, PTS)", for example, as a navigation command corresponding to the button object. When the navigation command is executed, the identifier # 1 of the playlist which is a playback unit is read, and the playback start time in the playlist is read as the PTS value. The AV clip corresponding to the reproduction unit identifier and the reproduction start time is read and reproduced (S730).

8 is a block diagram of an apparatus for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream according to the present invention.

Referring to FIG. 8, the playback apparatus includes a readout unit 910 for reading data from the information storage medium 900, buffer units 920 to 923 for temporarily storing the read data, and an engine for reproducing the buffered data. And parts 925 to 934. The playback unit reads the system data, and module manager 933 controls the navigation engine to handle title changes resulting from initial execution and user selection or navigation changes, and a navigation engine 931 for controlling playback of a video according to the contents of the navigation data. ), A presentation engine 932 for decoding and outputting video data to a screen, and a program engine 930 for executing an application program. A plurality of program engines may be used according to the type of application. For example, to play Java and HTML applications together, you need a Java virtual machine to run Java applications and a browser engine to run applications in HTML.

The navigation engine 931 reads and executes a navigation command according to the present invention. That is, when the user performs an operation such as clicking a button object, for example, "Play PLatST (# 1, PTS)" is performed as a navigation command corresponding to the button object. When the navigation command is executed, the identifier # 1 of the playlist, which is a playback unit, is read, and the playback start time in the playlist is read as the PTS value. Then, the presentation engine 932 reads and reproduces the AV clip corresponding to the playback unit's identifier and playback start time.

In addition, the blender 934 is further added to overlay the execution result of the application of the program engine 930 and the reproduction result of the video data of the presentation engine 932 to form one screen. Further, the program engine 930 may further include an application manager 925 for controlling 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 901 for storing a program application downloaded from the information storage medium 900 or the external database 902.

On the other hand, a method for reproducing the AV stream in accordance with the navigation command for enabling random access to the above-described AV stream can be made 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 the method is implemented by the computer to read and execute the AV stream in accordance with the navigation command to enable random access of the AV stream. do. 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, it is possible to more precisely control the playback position of the AV stream, and to enlarge the scene of the angle that the user wants to see by displaying videos of various angles in several screens smaller than the main screen. .

Claims (20)

A method for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream, (a) reading, as a first variable of the navigation command, an identifier of a reproduction unit containing information for controlling a reproduction order of a recording unit including the AV stream; (b) reading, as a second variable of the navigation command, a reproduction start time designated by referring to a time map in which a position of a specific picture among pictures constituting the AV stream is recorded in the reproduction unit; And and (c) reading and reproducing from the corresponding position of the recording unit corresponding to the identifier of the reproduction unit and the reproduction start time. The method of claim 1, And the playback unit is a playlist including information on the playback order of the AV stream. The method of claim 1, And the playback start time is a PTS value representing a playback start time of the AV stream. The method of claim 3, And the PTS value is a PTS value of an intra picture of a GOP constituting the AV stream. The method of claim 1, And the PTS value is determined by acquiring a PTS value at that time when a button object included in a recording unit corresponding to the identifier of the reproduction unit is selected and executed. The method of claim 1, And the AV stream is recorded by interleaving a plurality of angled AV streams. An information storage medium having recorded therein a navigation command for enabling random access of an AV stream, The navigation command, An identifier of a reproduction unit containing information for controlling the reproduction order of recording units including the AV stream; And An information storage medium having recorded therein a navigation command, characterized in that the playback start time is designated as a variable in reference to a time map in which the position of a specific picture is recorded among pictures constituting the AV stream. The method of claim 7, wherein And the playback unit is a playlist including information on the playback order of the AV stream. The method of claim 7, wherein And the playback start time is a PTS value representing a playback start time of the AV stream. The method of claim 9, Wherein the PTS value is a PTS value of an intra picture of a GOP constituting the AV stream. The method of claim 7, wherein And the PTS value is determined by obtaining a PTS value at that time when a button object included in a recording unit corresponding to the identifier of the playback unit is selected and executed. The method of claim 7, wherein The AV stream is an information storage medium having recorded navigation commands, characterized in that the plurality of angles of the AV stream are interleaved. An apparatus for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream. As an first variable of the navigation command, an identifier of a reproduction unit containing information for controlling the reproduction order of a recording unit including the AV stream is read, and within the reproduction unit as the second variable of the navigation command, A navigation engine that reads a specified playback start time by referring to a time map in which the position of a specific picture is recorded among pictures constituting the AV stream; And And a presentation engine which reads and reproduces from the corresponding position of the recording unit corresponding to the identifier of the reproduction unit and the reproduction start time. The method of claim 13, And the playback unit is a playlist including information on the playback order of the AV stream. The method of claim 13, And the playback start time is a PTS value representing a playback start time of the AV stream. The method of claim 15, And the PTS value is a PTS value of an intra picture of a GOP constituting the AV stream. The method of claim 13, And the PTS value is determined by acquiring a PTS value at that time when a button object included in a recording unit corresponding to the identifier of the reproduction unit is selected and executed. The method of claim 13, And the AV stream is recorded by interleaving a plurality of angles of the AV stream. A method for reproducing an AV stream in accordance with a navigation command that enables random access of an AV stream, (a) reading and playing an AV stream created by embedding a video of one angle as a main video and embedding at a certain position of the main video by using at least one video of another angle as a video having a smaller size than the main video; And (b) During playback of the AV stream, when a button object assigned to each position of the video of the other angle is executed, a corresponding navigation command is executed to convert the video of another angle corresponding to the button object into the main video. And reading out and reproducing the created AV stream. The method of claim 19, wherein the navigation command is An identifier of a reproduction unit containing information for controlling the reproduction order of recording units including the AV stream; And And a reproduction start time specified as a variable in reference to a time map in which a position of a specific picture is recorded among pictures constituting the AV stream.

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