digadiga for office 2003

8/14/2019 DigaDiga for Office 2003

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DIGADIGADIGADIGAVirtualVirtualClassClass


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CH. NAUMAN BIN NASIRCH. NAUMAN BIN NASIR(03fbs014)


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INTRODUCTIONINTRODUCTION


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Virtual class is actually an application that

has two parts

Teachers:Teachers: teachers can make the changes in

widgets. Like in whiteboard he canwrite/draw.

Students:Students: students can just see in all thewidgets what is happening. Like inwhiteboard they cannot make any change.


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Virtual class is an application through whichstudents can interact in real time with teacherover the internet and intranet. Besides audio andvisual transmission of teacher, virtual class can be

used to share documents, computer-displayedinformation, and whiteboards.


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FUNCTIONALFUNCTIONAL

REQUIREMENTSREQUIREMENTS


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FUNCTIONAL REQUIREMENTSFUNCTIONAL REQUIREMENTS

1.1. Video Sharing:Video Sharing: Students can seeteacher's gesture and posture, as it is veryimportant for getting things clear.

2.2. Audio Sharing: Audio Sharing: Teacher can share

his/her voice to all students for betterunderstanding.

3.3. Whiteboard:Whiteboard: Which is a shared drawingspace where teacher can demonstratethings in real time.


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Desktop Sharing:Desktop Sharing: Where teacher can sharehis desktop with his class to describe anyapplication to students more effectively.

Files Transfer:Files Transfer: A file transfer application for

sending files. Teacher can send assignments,quizzes and lecture notes to students.Students can send the solutions and otherfiles that they want to discuss with teacher.


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Attendance:Attendance: Automatic attendance of thestudents should be marked.

List of Students:List of Students: Everybody attending anddelivering the lecture should get the list ofpresent students.


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PLATFORMSPLATFORMS


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PLATFORMSPLATFORMS

Apache Tomcat

Red5 (RTMP Streaming Server)

Flash 8.0

ActionScript 2 (AS2) MySQL


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DATABASEDATABASE


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DATABASE (ENTITIES)DATABASE (ENTITIES)

student:student: carries students information

teacher:teacher: carries teacher information

sessionOn:sessionOn: which session are going on now session:session: students in the running session.

upload:upload: files that are uploaded by teacher


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RELATIONSHIPRELATIONSHIP


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RTMP AND RTMP SERVERRTMP AND RTMP SERVER


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RTMPRTMP

Real Time Messaging Protocol (RTMP)Real Time Messaging Protocol (RTMP) is aproprietary protocol developed by AdobeSystems for streaming audio, video and dataover the Internet, between a Flash player and

a server.


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RTMP SERVERRTMP SERVER

RTMPRTMP server using Real Time MessagingProtocol handles audio/video streaming, anddata transfer from flash player to other flashplayer.


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RED5 (RTMP SERVER)RED5 (RTMP SERVER)

Red5 is an open source Flash RTMP serverwritten in Java that supports:

Streaming Audio/Video (FLV and MP3)

Recording Client Streams (FLV only) Shared Objects

Live Stream Publishing

Remoting


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CONNECTION ANDCONNECTION AND

STREAMSSTREAMS


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CONNECTIONCONNECTION

Connection establishes to serverthrough NetConnection class

The NetConnection class manages a

bidirectional connection between FlashPlayer and a server, which lets youconnect to Flash Remoting or to FlashMedia Server. Flash Media Server

enables you to share audio, video, anddata using the Macromedia Real-TimeMessaging Protocol (RTMP).


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STREAMSSTREAMS

Stream is a constant delivery of video andaudio to subscriber from provider.

Streaming in RTMP occurs through aNetStream Class.

The NetStream class opens a one-waystreaming connection between Client andServer through a connection made availableby a NetConnection object.


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STRUCTURE OF STREAMINGSTRUCTURE OF STREAMING

A NetStream object is like a channel inside aNetConnection object; this channel can eitherpublish audio and/or video data.

Connection

Stream

Stream


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AUDIO/VIDEO SHARINGAUDIO/VIDEO SHARING


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AUDIO / VIDEOAUDIO / VIDEO

Receiving and sending of both audio andvideo is same.

One client publishes the stream to server andserver sends it to everybody connected tothat stream.


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STRUCTURE OF VIDEO/AUDIOSTRUCTURE OF VIDEO/AUDIO

SHARINGSHARING

RTMP Server

Client Client

Stream

(A)

Stream

(B) Stream

(B)

Stream(A)


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SHARED WHITEBOARDSHARED WHITEBOARD


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Whiteboard has two parts/ends.

Teachers End: Teacher can make changes toit using tools available at the side of

Students End: Students can just see, whatteacher is doing on his end.


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TEACHERS INTERFACE FOR WHITETEACHERS INTERFACE FOR WHITE

BOARDBOARD


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STUDENTS INTERFACE FOR WHITESTUDENTS INTERFACE FOR WHITE

BOARDBOARD


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Shared whiteboard works using sharedobjects.

Teacher puts the data in shared objects andall the attendee pick the new information and

update there whiteboard.


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SHARED OBJECTSSHARED OBJECTS


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SHARED OBJECTSSHARED OBJECTS

Shared-objects enable Flash movies tosave data which persists across multiplesessions.

Shared objects are of two types :

1) Local shared objects.

2) Remote shared objects.


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LOCAL SHARED OBJECTSLOCAL SHARED OBJECTS

Local shared objects are sometimes referredas Flash cookies.

Local shared objects are stored to the usershard drive.


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REMOTE SHARED OBJECTSREMOTE SHARED OBJECTS

Remote shared objects are stored on theCommunication server. So that, everybodyconnected to the application can use it.

It can be of two types

1) Persistent.

2) Non-Persistent.


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PERSISTENT SHARED OBJECTSPERSISTENT SHARED OBJECTS

If a shared object is declared persistent theserver keeps the value of object.

When all the clients disconnected from theserver even then server do not flush the

values of persistent shared objects.These types of shared objects can help us in

many situations. Where we want absentattendees to get the same lecture

afterwards.


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NON-PERSISTENT SHAREDNON-PERSISTENT SHARED

OBJECTSOBJECTS

As by name it is clear that, this kind ofshared objects are opposite to the persistentshared objects.

Server do not save the value of Non-

Persistent shared objects. When all clients checked out from the server,

server flushes the value of this kind of sharedobjects.


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WORKING OF WHITEBOARDWORKING OF WHITEBOARD


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TEACHERS ENDTEACHERS END

Teacher can select any of the tool from toolbar, to draw rectangle, filled rectangle, circle,line, free hand writing to do the appropriatetask for the application.

After selection teacher click and drag withinthe working area (white surface), to draw theselected object on board.

Adjusts the size according to the requirement

and release the mouse to paste the objectthere.

As the mouse releases all the attendeesconnected to the session will see the changeon the board.


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SHARING OF WHITE BOARDSHARING OF WHITE BOARD

OBJECTSOBJECTS

This sharing of objects just send 1 or 2 points toserver, this do not over load the bandwidth.

For Example: if teacher draws rectangle, teachersend of shared board will send two points, color, linethickness and a flag to shared object on the server.

COLOR

(x1,y1)

(x2,y2)

Flag = filledRectangle


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SHARING OF WHITE BOARDSHARING OF WHITE BOARD

OBJECTSOBJECTS

Student end will get the changes in shared board fromthe server and draws, the rectangle using thespecifications it got from the shared object.

COLOR

(x1,y1)

(x2,y2)

Flag = filledRectangle

(x2,y1)

(x1,y2)


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STUDENTS PRESENTSTUDENTS PRESENT


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LIST OF PRESENT STUDENTSLIST OF PRESENT STUDENTS

All the attendees including teacher will getthe list of everybody connected to thesession.

When a new person enters the session all the

connected people will get his name alongwith the picture in the list at on side.

This list is working using AJAX and PHP.

When a person gets connected, System

makes an entry in database. After every 10 secs system sends request to

database using AJAX and displays the resultin the list.


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ARC

HITECTU

RE


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SCREEN SHOT OF THE SYSTEMSCREEN SHOT OF THE SYSTEM


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THANKSTHANKS Presenter:Ch. Nauman bin Nasir

digadiga for office 2003

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