KR20000033045A - Method of receiving multicast audio and video information on web - Google Patents

Abstract

PURPOSE: A method of receiving multi cast audio and video information on web is provided to directly receive and reproduce audio and video information multi casted by real-time on a web browser without installing an auxiliary application program for reproduction. CONSTITUTION: According to a method of receiving multi cast audio and video information on web, a transmitter(11) produces a session holding the overall information for video and audio transmission and notifies(21) this to the outside, and transmits(22) the audio and video information to a receiver(13) according to this session information. Once the transmitter(11) starts notification, web SDR in the web server(12) receives this information, and produces(23) a session technique file including HTML session information and its detailed contents. If reception of audio/video information is requested (24), to a web document web server(12) holding a corresponding session information, a Java applet program and session file for receiving audio/video information is downloaded(25) from the web server(12). The receiver(13) can participate(26) in a desired corresponding session. After participation, the receiver(13) can reproduce and watch(27) the audio and video information currently received on the web browser without soldering through the Java applet.

Description

How to Receive Multicast Audio and Video Information on the Web

The present invention relates to a method for receiving multicast audio and video information on the web. In particular, the present invention can receive and play audio and video information that is currently being multicasted in real time on a web browser without installing a separate auxiliary application. The present invention relates to a method for receiving multicast audio and video information on a web.

As the use of the Internet and web browsers and the use of real-time multicast audio and video information are becoming more common, the function of receiving multicast audio and video information on a web browser is naturally required. Web browser users want to receive audio and video information that is currently multicasted in real time using only one web browser. To do this, installation or upgrade of a playback program is required to allow the receiver to receive audio and video information. It is one of the major disadvantages that I feel uncomfortable.

Conventionally, a method of installing and using an auxiliary application for receiving multicast audio and video information on a web browser has been used. However, this method has a disadvantage of having to install a manual assistant program to receive the desired type of audio and video, and open a separate window from the web browser for playing the received screen. Recently, a technology called plug-in has been developed in order to play directly in a web browser without opening a separate window, but this method also has a disadvantage in that a plug-in program must be installed in advance.

In other words, in order to receive audio / video information transmitted in real time on a web browser, a separate application program such as an auxiliary application program or a plug-in program for reproduction must be installed on the receiving side. In order to receive audio / video information, the receiver must first verify that a program is installed in the web browser to play the type of audio / video they wish to receive. Audio / video information currently being relayed can be received. Currently, multicast is used as a technology for efficiently transmitting real-time audio and video to multiple receivers, and transmission and reception applications using the same are being actively developed.

Accordingly, the present invention allows a program for playing audio and video information to be automatically downloaded from a web server through a Java applet using a Java applet to receive audio and video information currently multicasted in real time on a web browser. It is an object of the present invention to provide a method for receiving multicast audio and video information on the web without requiring a separate program for playback.

In accordance with an aspect of the present invention, a method for receiving multicast audio and video information on the web according to the present invention generates a session containing all information for transmitting audio and video at the transmitting side and announces the session to the outside, according to the session information. Initiating transmission of audio and video information to a receiving side, generating session information web document and session description file in a web session directory of a web server according to the session information generated at the transmitting side, and generating the audio and video information. Requesting the web server from the receiving side to receive the web document from the web browser, and returning the web document from the web server to the receiving side, and simultaneously downloading the Java applet program and session file to the receiving side. Steps, Java Applet Pro automatically downloaded from the web server RAM and is characterized in that by using a session file, comprising the step of playing the received audio and video information through a step of the receiving party participating in the session, the Java Applet program on the web browser.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram for explaining the configuration of a sender, a receiver and a web server applied to the present invention.

2 is a flowchart illustrating a method of receiving multicast audio and video information on a web according to the present invention.

<Explanation of symbols on the main parts of the drawing>

11: sender 12: web server

13: recipient 14: internet

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

1 is a diagram illustrating the configuration of a sender, a receiver, and a web server according to the present invention.

The environment for receiving audio and video information multicast on a web browser is composed of a sender 11, a web server 12 and a receiver 13.

The sender 11 creates a session using a session directory program such as Session DiRectory (hereinafter referred to as SDR), and then uses a visual audio tool (VAT) and a video conferencing tool (VIC). It plays a role of transmitting audio / video using multicast audio and video transmission program such as). The sender 11 is identical to the general sender configuration for transmitting multicast audio / video over the Internet 14.

The web server 12 is a server on which a hypertext transfer protocol daemon (hereinafter referred to as HTTPD), which is a general web server program, operates. If the receiver 13 requests a session information web document, it is returned. Play a role. Session Information Web documents are generally HTML type documents. Although the web server 12 generally serves to return the document according to the request of the web browser on the Internet, in addition to the web server program, an additional web SDR program is installed in the web server to create a session at the sender. It is different from the extension to generate session information web documents and session description files in the web server. The web SDR extension in the web server 12 portion is generally standardized on the Internet, in a general way for having multicast audio / video information in a web server.

The receiver 13 seamlessly receives the current multicast audio / video from the sender 11 via the Internet 14 using only one web browser without any auxiliary program. When the document is requested from the web server 12, and the document is obtained from the web server 12, at the same time, the session description file generated from the Java applet program and the web SDR is automatically downloaded and used to transmit the currently transmitted audio, Receive and play video.

2 is a flowchart illustrating a method of receiving multicast audio and video information on the web according to the present invention.

The sender 11 first creates a session containing the entire information for video and audio transmission, announces it to the outside (21), and then starts transmitting the audio / video information to the receiver 13 according to the session information. (22). This transmission scheme is generally the same as the scheme for transmitting multicast audio and video information over the Internet. When the sender 11 starts to create and announce a session, the web SDR in the web server 12 receives this information and the session information web document of HTML type including the <APPLET> tag to use the Java applet as a player. A session description file is created that contains the details of the session (23).

For example, an HTML-type session information web document including the <APPLET> tag is as follows.

......

<H1> Audio / Video </ H1>

<APPLET CODE = RTPPlay.class WIDTH = 500 HEIGHT = 400>

<PARAM TYPE = file VALUE = mbone.sdp>

</ APPLET>

......

As such, the session information web document includes a <APPLET> </ APPLET> tag for automatically downloading a Java applet program (e.g., RTPPlayer.class), and the screen size to be played (e.g., 500 pixels wide, Also included is a WIDTH, HEIGHT statement to indicate 400 pixels in height, and a PARAM statement to automatically download a session description file (eg mbone.sdp) that contains the details of the session.

Also, the session description file is as follows.

m = audio 21690 RTP / AVP 0

c = IN IP4 224.2.143.56/127

m = video 51990 RTP / AVP 31

c = IN IP4 224.2.200.96/127

The session description file is configured in the form of "type = value", m is a media type, and c is a characteristic according to the media type. This notation was used by applying the Session Description Protocol (SDP) notation, which is a standard on the Internet.

The procedure on the web server 12 side is generally the same as the procedure for returning a document according to the request of a web browser on the Internet. However, when a session is created on the sender side in addition to the web server program, the web SDR program receives information about the session information. The procedure for creating Web documents and session description files in a web server has been extended. The Web SDR extension part of the web server processing process is generally the standard way of making multicast audio / video information in the web server, and is currently standardized on the Internet. The receiver 13 generates a session on the sender 11 side, and operates according to the following procedure to receive the audio / video after the web server 12 generates the session information web document and the session description file. First, when requesting a web document web server 12 containing information of a corresponding session to be received by a web browser (24), a Java applet program and session file for receiving audio / video information upon receipt of the document are displayed. It is automatically downloaded from server 12 (25). The receiver 13 can participate in the desired session by using the information (26), and after the session is joined, the user can play and view the audio / video information currently received on the web browser seamlessly through the Java applet. (27)

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited.

As described above, according to the present invention, a Java applet, which is a program for playing audio and video information, is automatically downloaded from the web server when the session information web document is received. There is no need to install it. In addition, the platform-independent nature of the Java applet code allows this method to be applied to any operating system supported by the Java virtual machine. There is an effect that eliminates the need to install an additional playback program on the receiving side for the expansion or upgrade of the video type.

Claims (4)

Generating a session containing the entire information for transmitting audio and video at the transmitting side and notifying the outside to the outside, and initiating transmission of the audio and video information to the receiving side according to the session information; Generating a session information web document and a session description file in a web session directory of a web server according to the session information generated by the sender; Requesting the web server to receive a web document to be received by a web browser at the receiving side which has received the audio and video information; Returning a web document from the web server to the receiving side and simultaneously downloading a Java applet program and a session file to the receiving side; Using the Java applet program and session file automatically downloaded from the web server, the receiving party joins the session; And reproducing the received audio and video information on a web browser via the Java applet program. The method of claim 1, Method for receiving multicast audio and video information on the web, characterized by including an applet (APPLET) tag in the session information web document The method of claim 1, And embedding a PARAM phrase in the session information web document. The method of claim 1, And generating the session description file using a session presentation protocol representation.