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To analyze the code get video-chat-and-screen-sharing.js file version with hash ecbadc3 90771d4 that can be found here and is available to download in build 2.0.212218.

1. API initializing.

Flashphoner.init() code

Code Block

language	js
theme	RDark

    try {
        Flashphoner.init();
    } catch(e) {
        $("#notifyFlash").text("Your browser doesn't support WebRTC technology needed for this example");
        return;
    }

2. Connection to the serverRoomApi.connectCamera and microphone access request

Flashphoner.getMediaAccess() code

Code Block

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theme	RDark

    connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.FAILED, function(session)Flashphoner.getMediaAccess(null, localDisplay).then(function() {
        setStatuscreateConnection('#status'url, session.status()username);
        onLeft();
    }).on(SESSION_STATUS.DISCONNECTED, function(session}).catch(function(error) {
        setStatus('#status', session.status())console.error("User not allowed media access: "+error);
        onLeft$();
    "#failedInfo").text("User not allowed media access. Refresh the page");
        onLeft();
    });

3. Connection to the server

RoomApi.connect() code

Code Block

language	js
theme	RDark

function createConnection(url, username) {
    connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.ESTABLISHEDFAILED, function(session) {
        setStatus('#status', session.status());...
        joinRoom(});
    });

34. Receiving Receiving the event confirming successful connection

ConnectionStatusEvent ESTABLISHED code

Code Block

language	js
theme	RDark

    connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.FAILED, function(session){
        ...
    }).on(SESSION_STATUS.DISCONNECTED, function(session) {
        ...
    }).on(SESSION_STATUS.ESTABLISHED, function(session) {
        setStatus('#status', session.status());
        joinRoom();
    });

45. Joining to the room

connection.join() code

To join, name of the conference room is passed to the method. (The name can be specified as parameter in the URL of the client page; otherwise, random name will be generated.)

Code Block

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theme	RDark

    connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
        ...
    });

56. Receiving Receiving the event describing chat room state

RoomStatusEvent STATE code

On this event:

the length of the array of Participant objects returned by method Room.getParticipants() is determined to get the number of already connected participants
if the maximum allowed number of participants had already been reached, the user leaves the "room"
otherwise, the user starts publishing video stream

Code Block

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theme	RDark

   connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
        var participants = room.getParticipants();
        console.log("Current number of participants in the room: " + participants.length);
        if (participants.length >= _participants) {
            console.warn("Current room is full");
            $("#failedInfo").text("Current room is full.");
            room.leave().then(onLeft, onLeft);
            return false;
        }
        room_ = room;
        setInviteAddress(room.name());
        if (participants.length > 0) {
            var chatState = "participants: ";
            for (var i = 0; i < participants.length; i++) {
                installParticipant(participants[i]);
                chatState += participants[i].name();
                if (i != participants.length - 1) {
                    chatState += ",";
                }
            }
            addMessage("chat", chatState);
        } else {
            addMessage("chat", " room is empty");
        }
        publishLocalMedia(room);
        onJoined(room);
    }).on(ROOM_EVENT.JOINED, function(participant){
        ...
    }).on(ROOM_EVENT.LEFT, function(participant){
        ...
    }).on(ROOM_EVENT.PUBLISHED, function(participant){
        ...
    }).on(ROOM_EVENT.FAILED, function(room, info){
        ...
    }).on(ROOM_EVENT.MESSAGE, function(message){
        ...
    });

67. Screen streaming

room.publish() code

These parameters are passed to room.publish() method:

...

Code Block

language	js
theme	RDark

    var constraints = {
        video: {
            width: parseInt($('#width').val()),
            height: parseInt($('#height').val()),
            frameRate: parseInt($('#fps').val()),
            withoutExtension: true
        },
        audio: $("#useMic").prop('checked')
    };
    constraints.video.type = "screen";
    if (Browser.isFirefox()){
        constraints.video.mediaSource = "screen";
    }
    var options = {
        name: "screenShare",
        display: document.getElementById("preview"),
        constraints: constraints,
        cacheLocalResources: false
    }
    if (isSafariMacOS()) {
        options.disableConstraintsNormalization = true;
    }
    room.publish(options).on(STREAM_STATUS.FAILED, function (stream) {
        ...
    });

78. Receiving Receiving the event notifying that other participant joined to the room

RoomStatusEvent JOINED code

Code Block

language	js
theme	RDark

    connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
        ...
    }).on(ROOM_EVENT.JOINED, function(participant){
        installParticipant(participant);
        addMessage(participant.name(), "joined");
    }).on(ROOM_EVENT.LEFT, function(participant){
        ...
    }).on(ROOM_EVENT.PUBLISHED, function(participant){
        ...
    }).on(ROOM_EVENT.FAILED, function(room, info){
        ...
    }).on(ROOM_EVENT.MESSAGE, function(message){
        ...
    });

89. Receiving Receiving the event notifying that other participant published video stream

RoomStatusEvent PUBLISHED code

Code Block

language	js
theme	RDark

    connection.join({name: getRoomName()}).on(ROOM_EVENT.STATE, function(room){
        ...
    }).on(ROOM_EVENT.JOINED, function(participant){
        ...
    }).on(ROOM_EVENT.LEFT, function(participant){
        ...
    }).on(ROOM_EVENT.PUBLISHED, function(participant){
        playParticipantsStream(participant);
    }).on(ROOM_EVENT.FAILED, function(room, info){
        ...
    }).on(ROOM_EVENT.MESSAGE, function(message){
        ...
    });

910. Playback Playback of video stream.

participant.play() code

<div> element, in which the video will be displayed depending on source (web camera or screen), is passed to the participant.play() method.

Code Block

language	js
theme	RDark

function playParticipantsStream(participant) {
    if (participant.getStreams().length > 0) {
        for (var i=0; i<participant.getStreams().length; i++) {
            $("[id$=Name]").each(function (index, value) {
                if ($(value).text() == participant.name()) {
                    var p = value.id.replace('Name', '');
                    var pDisplay = p + 'Display';
                    // check if we already play this stream
                    if (document.getElementById(participant.getStreams()[i].id()) == null) {
                        // setup 1st stream to main div
                        if (participant.getStreams()[i].streamName().indexOf("screenShare") == -1) {
                            participant.getStreams()[i].play(document.getElementById(pDisplay)).on(STREAM_STATUS.PLAYING, function (playingStream) {
                                document.getElementById(playingStream.id()).addEventListener('resize', function (event) {
                                    resizeVideo(event.target);
                                });
                            });
                        } else {
                            participant.getStreams()[i].play(document.getElementById("sharedDisplay")).on(STREAM_STATUS.PLAYING, function (playingStream) {
                                document.getElementById(playingStream.id()).addEventListener('resize', function (event) {
                                    resizeVideo(event.target);
                                });
                            });
                        }
                    }
                }
            });
        }
    }
}

1011. Stop of screen sharing.

stream.stop() code

Code Block

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theme	RDark

    room.publish(options).on(STREAM_STATUS.FAILED, function (stream) {
        ...
    }).on(STREAM_STATUS.PUBLISHING, function (stream) {
        /*
         * User can stop sharing screen capture using Chrome "stop" button.
         * Catch onended video track event and stop publishing.
         */
        document.getElementById(stream.id()).srcObject.getVideoTracks()[0].onended = function (e) {
            stream.stop();
        };
        ...
    }).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
        ...
    });

1112. Receiving the event confirming successful screen sharing stop.

StreamStatusEvent UNPUBLISHED code

Code Block

language	js
theme	RDark

    room.publish(options).on(STREAM_STATUS.FAILED, function (stream) {
        ...
    }).on(STREAM_STATUS.PUBLISHING, function (stream) {
        ...
    }).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
        onStopSharing();
    });

1213. Leaving chat room.

room.leave() code

Code Block

language	js
theme	RDark

function onJoined(room) {
    $("#joinBtn").text("Leave").off('click').click(function(){
        $(this).prop('disabled', true);
        room.leave().then(onLeft, onLeft);
    }).prop('disabled', false);
    ...
}

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