KR20000066071A - Method for displaying play-time of MPEG data and apparatus thereof - Google Patents

Abstract

PURPOSE: A MPEG data replay amount displaying method and apparatus displays a time information for a replay amount on a screen to easily recognizes it by user. CONSTITUTION: A MPEG data receiving unit(310) is composed of high speed modem or ADSL(Asymmetric Digital Subscription Line), and receives MPEG data of bit stream form transmitted from a MPEG server. A demultiplexor unit(320) detects header and payload region from the MPEG data of the bit stream form received from the MPEG data receiving unit, and divides it into a header information, a compression image, and a compression voice data. A controlling unit(326) analyzes the header information, detects a private data PCR(Program Clock Reference) corresponding to a total playing time information of a program, and calculates the current replay time and the rest replay time by comparing the first received PCR value with the current received PCR value. A MPEG image restoring unit(330) restores the compression image data to an original image data. A MPEG voice restoring unit(340) restores the compression voice data to an original voice data. A graphic overlaying unit(350) outputs an image data overlaying an OSD data inputted from the controlling unit with the original image data inputted from the MPEG image restoring unit. A TV interface unit(360) converts the overlaid image data outputted from the graphic overlaying unit into a television signal.

Description

Method for displaying play-time of MPEG data and apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for reproducing moving picture data (MPEG) data, and more particularly, to an MPEG data reproduction amount display method and apparatus for displaying a reproduction amount state of a moving picture using MPEG data on a screen.

1 is a block diagram showing a general MPEG system.

The MPEG encoder 110 compressively encodes original analog video and audio signals according to the MPEG standard. The MPEG data server 120 stores MPEG data compressed and encoded by the MPEG encoder 110 and transmits the MPEG data to the network 130 in the form of a bitstream. The MPEG restorer 140 restores the MPEG data in the form of a bit stream received from the network 130 into video and audio data. At this time, when the user wants to watch a desired video using a menu included in the MPEG restorer 140, the MPEG restorer 140 communicates the video with the MPEG data server 120 to network the corresponding MPEG video data. Received through 130, and displayed on the monitor screen at the same time.

However, the system of FIG. 1 only plays MPEG data restored on the screen, and it is inconvenient because it does not know the time information of the MPEG data, for example, the playback time from the initial screen to the present, the total playback time, and the remaining playback time. There was this.

The technical problem to be achieved by the present invention is to display the time information on the playback amount on the screen so that the user can easily recognize using the private data and time reference value (PCR: Program Clock Reference) included in the header information during MPEG data playback There is provided a method and apparatus for displaying MPEG data reproduction amount.

1 is a block diagram showing a general MPEG system.

Figure 2 shows the structure of a transport stream packet in the conventional MPEG-2 standard.

3 is a block diagram of an MPEG data decompression device for displaying the amount of MPEG data reproduction according to the present invention.

4 is a flowchart illustrating a method for displaying MPEG data reproduction amount by the controller of FIG. 3.

5 shows an example of a method for displaying MPEG data reproduction amount displayed on a screen according to the present invention.

In order to solve the above technical problem, the present invention comprises a header and a payload, the header includes a user-defined data recorded the total running time of the program and a time reference value that is the reference of one program, In the playback amount display method in MPEG data containing video data,

A first step of receiving the MPEG data and extracting a time reference value and user-defined data in a header;

A second step of first extracting user-defined data recorded with the total running time in the first step and then calculating current reproduction time information with respect to the total image time whenever the time reference value is extracted;

And a third process of converting the play time information calculated in the second process into graphic data of a specific type and displaying the same on a screen.

In order to solve the above other technical problem, the present invention is composed of a payload including a PCR value and a header for the user data and the image data display the amount of MPEG data playback time recording the program running time in the user data In the apparatus,

A demultiplexer for separating compressed video data and a header from an input MPEG bit stream;

An image restoring unit for restoring the compressed image data separated by the multiplexer;

A control unit for calculating reproduction time information for the total running time information corresponding to the user data each time a PCR value is detected from the header separated by the multiplexer unit, and converting the time information into predetermined graphic data;

And a graphic overlay unit for overlaying graphic data corresponding to time information generated in the control unit and image data generated in the image restoring unit.

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

Figure 2 shows the structure of a transport stream packet in the conventional MPEG-2 standard. The transport packet stream packet is a fixed length packet of 188 bytes. This length considers the compatibility with ATM cell length and the applicability in error correction coding. As shown in FIG. 3, the transport stream packet is composed of a header and a payload, and the sync bytes of the header portion are arranged in bytes. Therefore, TS packets can be found by aligning bytes in the TS stream to find sync bytes.

The adaptation field consists of information such as adaptation field length, optional field, stuffing bytes, etc., and the PCR (Program Clock) in the optional field. Reference: Contains information such as time information that is the basis of a program, transport private data, and so on. Here, PCR is a value obtained by sampling the time of the system encoder with a system clock of 27 MHz, which represents a time reference value for a program in the TS, and synchronizes video and audio with time error between the MPEG encoder device and the reconstruction device. In addition, one PCR value is included in the MPEG data at least once every 0.7 seconds, and is composed of 33 bits at intervals of 1/27 MHz. The transport private data can be recorded as user data, such as time information such as the total running time of the program.

3 is a block diagram of an MPEG data decompression device for displaying the amount of MPEG data reproduction according to the present invention.

First, the MPEG data receiver 310 may be configured as a high speed modem or an Asymmetric Digital Subscription Line (ADSL), and receives MPEG data in a bitstream form as shown in FIG. 2 transmitted from an MPEG server from a network. Here, the private data and the PCR data in which the program time information is recorded are recorded in the header of FIG.

The demux (DMUX) unit 220 separates the header information, the compressed image, and the compressed audio data by detecting the header and the payload region in the bitstream form MPEG data received from the MPEG data receiver 310. .

The control unit 326 analyzes the header information output from the demux unit 320 to detect the private data PCR corresponding to the program total running time information, and compares the currently received PCR value with the first received PCR value. The remaining play time is calculated along with the current play time. In addition, the controller 326 converts the calculated total running time, current playing time, and remaining playing time information into OSD (On Screen Display) data or special graphic data.

The MPEG image restorer 330 restores the compressed image data input from the demux 320 to the original image data. The MPEG voice restorer 340 restores the compressed voice data input from the demux 320 to the original voice data.

The graphic overlay unit 350 outputs image data obtained by overlaying the image data input from the MPEG image restorer 330 and the OSD data input from the controller 326.

The TV interface unit 360 converts the overlay image data output from the graphic overlay unit 350 into a television signal such as NTSC or PAL.

4 is a flowchart illustrating a method for displaying MPEG data reproduction amount by the controller 326 of FIG. 3.

First, in step 410, the private data and the PCR data are detected from the header separated by the demux unit 320 and temporarily stored in the memory.

The time base is calculated from the stored private data in step 420 and converted into total image time information.

In step 430, the current PCR is confirmed. Therefore, each time the PCR value is received, the current reproduction time is obtained by calculating (the first received PCR + the currently received PCR) x 1 / 27M in step 440.

The remaining play time is calculated by subtracting the current play time from the total running time stored in step 440.

The total running time, current playing time, and remaining playing time information calculated in steps 460 and 470 are converted into OSD data or special graphic data and displayed on a specific portion of the screen.

Fig. 5 is an example of a method for displaying MPEG data reproduction amount displayed on a screen according to the present invention, in which a specific portion of the screen includes " total running time: ××× ", " current playback time: ××× " Playback time: ××× "

The present invention is not limited to the above-described embodiment, and of course, modifications can be made by those skilled in the art within the spirit of the present invention. In other words, if the output display of time information is not necessary, the controller 330 stores the PCR value every time the PCR value is received and allocates a special key to the user's special ie, the remote controller. Information can be displayed graphically.

As described above, according to the present invention, in the restoration of video information using MPEG, it is possible to visually inform the user visually of the total time-to-restore information on the reproduction amount of MPEG data.

Claims (6)

A header and payload, wherein the header includes user-defined data in which the total running time of the program is recorded and a time reference value as a reference for one program, and the payload indicates the reproduction amount in MPEG data including image data. In the method, A first step of receiving the MPEG data and extracting a time reference value and user-defined data in a header; A second step of first extracting user-defined data recorded with the total running time in the first step and then calculating current reproduction time information with respect to the total image time whenever the time reference value is extracted; And a third process of converting each play time information calculated in the second process into graphic data of a specific type and displaying the same on a screen. The method of claim 1, wherein the time reference value is a PCR value of a header region in an MPEG bitstream. The method according to claim 1, wherein total running time information is separately recorded at the beginning of said user-defined data area of said MPEG data. The method of claim 1, wherein the second process calculates the current play time information by (first received PCR + currently received PCR) x 1 / 27M, and subtracts the total running time from the current play time information to obtain the remaining play time information. MPEG data reproduction amount display method characterized in that the calculation process. An MPEG data reproduction amount display device comprising a PCR value, a header including user data, and a payload including image data, wherein a running time of a program is recorded in the user data. A demultiplexer for separating compressed video data and a header from an input MPEG bit stream; An image restoring unit for restoring the compressed image data separated by the multiplexer; A control unit for calculating reproduction time information for the total running time information corresponding to the user data each time a PCR value is detected from the header separated by the multiplexer unit, and converting the time information into predetermined graphic data; And a graphic overlay unit for overlaying graphic data corresponding to time information generated in the control unit with image data generated in the image restoring unit. The apparatus of claim 5, wherein the control unit is a means for selectively displaying the time information on the graphic overlay unit according to whether a separately allocated time information display key is input.