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To analyze the code, let's take the version of file conference.js with hash 05436f890771d4, which is available here and can be downloaded with corresponding build 2.0.216218.

Script for video conference uses roomApi designed for video chats, video conferences, webinars and other applications that involve presence of users in one virtual "room". To use RoomApi, the script flashphoner-room-api.js should be included

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1. Initialization of the API.

Flashphoner.init() code

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Flashphoner.init();

...

	RDark

Flashphoner.init();

2. Camera and microphone access request

Flashphoner.getMediaAccess() code

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    Flashphoner.getMediaAccess(null, localDisplay).then(function() {
        createConnection(url, username);
    }).catch(function(error) {
        console.error("User not allowed media access: "+error);
        $("#failedInfo").text("User not allowed media access. Refresh the page");
        onLeft();
    });

3. Connection to server.

RoomApi.connect() code

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function createConnection(url, username) {
    connection = RoomApi.connect({urlServer: url, username: username}).on(SESSION_STATUS.FAILED, function(session){
        ...
    });
}

34. Receiving Receiving the event confirming successful connection

ConnectionStatusEvent ESTABLISHED code

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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 a conference.

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.)

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connection.join({name: getRoomName(), record: isRecord()}).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" (line 85)
otherwise, the user starts publishing video stream

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connection.join({name: getRoomName(), record: isRecord()}).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;
    }
    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. Low Power Mode checking before publishing on mobile device

Flashphoner.playFirstVideo() code

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    if (Browser.isSafariWebRTC()) {
        var display = document.getElementById("localDisplay");
        Flashphoner.playFirstVideo(display, true, PRELOADER_URL).then(function() {
            publishLocalMedia(room);
        }).catch(function (error) {
            console.log("Can't atomatically publish local stream, use Publish button");
            for (var i = 0; i < display.children.length; i++) {
                if (display.children[i]) {
                    console.log("remove cached instance id " + display.children[i].id);
                    display.removeChild(display.children[i]);
                }
            }
            onMediaStopped(room);
        });
    }

78. Video streaming.

room.publish() code

<div> element 'localDisplay', in which video from camera will be displayed, is passed to the room.publish() method

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    room.publish({
        display: display,
        constraints: constraints,
        record: false,
        receiveVideo: false,
        receiveAudio: false
    }).on(STREAM_STATUS.FAILED, function (stream) {
        console.warn("Local stream failed!");
        setStatus("#localStatus", stream.status());
        onMediaStopped(room);
    }).on(STREAM_STATUS.PUBLISHING, function (stream) {
        setStatus("#localStatus", stream.status());
        onMediaPublished(stream);
    }).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
        setStatus("#localStatus", stream.status());
        onMediaStopped(room);
    });

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

RoomStatusEvent JOINED code

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connection.join({name: getRoomName(), record: isRecord()}).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){
     ...
});

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

RoomStatusEvent PUBLISHED code

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connection.join({name: getRoomName(), record: isRecord()}).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){
     ...
});

1011. Low Power Mode checking before playback on mobile device

Flashphoner.playFirstVideo() code

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                if (Browser.isSafariWebRTC()) {
                    Flashphoner.playFirstVideo(pDisplay, false, PRELOADER_URL).then(function() {
                        playStream(participant, pDisplay);
                    }).catch(function (error) {
                        // Low Power Mode detected, user action is needed to start playback in this mode #WCS-2639
                        console.log("Can't atomatically play participant" + participant.name() + " stream, use Play button");
                        for (var i = 0; i < pDisplay.children.length; i++) {
                            if (pDisplay.children[i]) {
                                console.log("remove cached instance id " + pDisplay.children[i].id);
                                pDisplay.removeChild(pDisplay.children[i]);
                            }
                        }
                        onParticipantStopped(participant);
                    });
                }

1112. Playback of video stream.

participant.play() code

The following parameters are passed to the method:

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        var options = {
            unmutePlayOnStart: true,
            constraints: {
                audio: {
                    deviceId: 'default'
                }
            }
        };
        // Leave participant stream muted in Android Edge browser #WCS-3445
        if (Browser.isChromiumEdge() && Browser.isAndroid()) {
            options.unmutePlayOnStart = false;
        }
        participant.getStreams()[0].play(display, options).on(STREAM_STATUS.PLAYING, function (playingStream) {
            var video = document.getElementById(playingStream.id())
            video.addEventListener('resize', function (event) {
                resizeVideo(event.target);
            });
            // Set up participant Stop/Play button
            if (playBtn) {
                $(playBtn).text("Stop").off('click').click(function() {
                    $(this).prop('disabled', true);
                    playingStream.stop();
                }).prop('disabled', false);
            }
            // Set up participant audio toggle button #WCS-3445
            if (audioBtn) {
                $(audioBtn).text("Audio").off('click').click(function() {
                    if (playingStream.isRemoteAudioMuted()) {
                        playingStream.unmuteRemoteAudio();
                    } else {
                        playingStream.muteRemoteAudio();
                    }
                }).prop('disabled', false);
            }
            // Start participant audio state checking timer #WCS-3445
            participantState.startMutedCheck(playingStream);
        }).on(STREAM_STATUS.STOPPED, function () {
            onParticipantStopped(participant);
        }).on(STREAM_STATUS.FAILED, function () {
            onParticipantStopped(participant);
        });

1213. Stop of streaming.

stream.stop() code

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function onMediaPublished(stream) {
    $("#localStopBtn").text("Stop").off('click').click(function(){
        $(this).prop('disabled', true);
        stream.stop();
    }).prop('disabled', false);
    ...
}

1314. Receiving the event confirming successful streaming stop

StreamStatusEvent UNPUBLISHED code

Code Block

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room.publish({
    display: display,
    constraints: constraints,
    record: false,
    receiveVideo: false,
    receiveAudio: false
}).on(STREAM_STATUS.FAILED, function (stream) {
    ...
}).on(STREAM_STATUS.PUBLISHING, function (stream) {
    ...
}).on(STREAM_STATUS.UNPUBLISHED, function(stream) {
    setStatus("#localStatus", stream.status());
    onMediaStopped(room);
});

1415. Leaving conference room

room.leave() code

Code Block

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

1516. Mute/unmute audio and video of the published stream

stream.isAudioMuted(), stream.isVideoMuted(), stream.muteAudio(), stream.unmuteAudio(), stream.muteVideo(), stream.unmuteVideo() code

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function onMediaPublished(stream) {
    ...
    $("#localAudioToggle").text("Mute A").off('click').click(function(){
        if (stream.isAudioMuted()) {
            $(this).text("Mute A");
            stream.unmuteAudio();
        } else {
            $(this).text("Unmute A");
            stream.muteAudio();
        }
    }).prop('disabled', false);
    $("#localVideoToggle").text("Mute V").off('click').click(function() {
        if (stream.isVideoMuted()) {
            $(this).text("Mute V");
            stream.unmuteVideo();
        } else {
            $(this).text("Unmute V");
            stream.muteVideo();
        }
    }).prop('disabled',false);
}

1617. Sending text message.

participant.sendMessage() code

When Send button is clicked,

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