jitsi_corner8/videolayout.js

var VideoLayout = (function (my) {
    var preMuted = false;
    var currentDominantSpeaker = null;
    var defaultRemoteDisplayName = "Fellow Jitster";
    var defaultDominantSpeakerDisplayName = "Speaker";
    var lastNCount = config.channelLastN;
    var lastNEndpointsCache = [];
    var largeVideoNewSrc = '';

    my.changeLocalAudio = function(stream) {
        connection.jingle.localAudio = stream;

        RTC.attachMediaStream($('#localAudio'), stream);
        document.getElementById('localAudio').autoplay = true;
        document.getElementById('localAudio').volume = 0;
        if (preMuted) {
            toggleAudio();
            preMuted = false;
        }
    };

    my.changeLocalVideo = function(stream, flipX) {
        connection.jingle.localVideo = stream;

        var localVideo = document.createElement('video');
        localVideo.id = 'localVideo_' + stream.id;
        localVideo.autoplay = true;
        localVideo.volume = 0; // is it required if audio is separated ?
        localVideo.oncontextmenu = function () { return false; };

        var localVideoContainer = document.getElementById('localVideoWrapper');
        localVideoContainer.appendChild(localVideo);

        // Set default display name.
        setDisplayName('localVideoContainer');

        AudioLevels.updateAudioLevelCanvas();

        var localVideoSelector = $('#' + localVideo.id);
        // Add click handler to both video and video wrapper elements in case
        // there's no video.
        localVideoSelector.click(function () {
            VideoLayout.handleVideoThumbClicked(localVideo.src);
        });
        $('#localVideoContainer').click(function () {
            VideoLayout.handleVideoThumbClicked(localVideo.src);
        });

        // Add hover handler
        $('#localVideoContainer').hover(
            function() {
                VideoLayout.showDisplayName('localVideoContainer', true);
            },
            function() {
                if (!VideoLayout.isLargeVideoVisible()
                        || localVideo.src !== $('#largeVideo').attr('src'))
                    VideoLayout.showDisplayName('localVideoContainer', false);
            }
        );
        // Add stream ended handler
        stream.onended = function () {
            localVideoContainer.removeChild(localVideo);
            VideoLayout.updateRemovedVideo(localVideo.src);
        };
        // Flip video x axis if needed
        flipXLocalVideo = flipX;
        if (flipX) {
            localVideoSelector.addClass("flipVideoX");
        }
        // Attach WebRTC stream
        RTC.attachMediaStream(localVideoSelector, stream);

        localVideoSrc = localVideo.src;

        VideoLayout.updateLargeVideo(localVideoSrc, 0);
    };

    /**
     * Checks if removed video is currently displayed and tries to display
     * another one instead.
     * @param removedVideoSrc src stream identifier of the video.
     */
    my.updateRemovedVideo = function(removedVideoSrc) {
        if (removedVideoSrc === $('#largeVideo').attr('src')) {
            // this is currently displayed as large
            // pick the last visible video in the row
            // if nobody else is left, this picks the local video
            var pick
                = $('#remoteVideos>span[id!="mixedstream"]:visible:last>video')
                    .get(0);

            if (!pick) {
                console.info("Last visible video no longer exists");
                pick = $('#remoteVideos>span[id!="mixedstream"]>video').get(0);

                if (!pick || !pick.src) {
                    // Try local video
                    console.info("Fallback to local video...");
                    pick = $('#remoteVideos>span>span>video').get(0);
                }
            }

            // mute if localvideo
            if (pick) {
                VideoLayout.updateLargeVideo(pick.src, pick.volume);
            } else {
                console.warn("Failed to elect large video");
            }
        }
    };

    /**
     * Updates the large video with the given new video source.
     */
    my.updateLargeVideo = function(newSrc, vol) {
        console.log('hover in', newSrc);

        if ($('#largeVideo').attr('src') != newSrc) {
            largeVideoNewSrc = newSrc;

            var isVisible = $('#largeVideo').is(':visible');

            // we need this here because after the fade the videoSrc may have
            // changed.
            var isDesktop = isVideoSrcDesktop(newSrc);

            var userJid = getJidFromVideoSrc(newSrc);
            // we want the notification to trigger even if userJid is undefined,
            // or null.
            $(document).trigger("selectedendpointchanged", [userJid]);

            $('#largeVideo').fadeOut(300, function () {
                var oldSrc = $(this).attr('src');

                $(this).attr('src', newSrc);

                // Screen stream is already rotated
                var flipX = (newSrc === localVideoSrc) && flipXLocalVideo;

                var videoTransform = document.getElementById('largeVideo')
                                        .style.webkitTransform;

                if (flipX && videoTransform !== 'scaleX(-1)') {
                    document.getElementById('largeVideo').style.webkitTransform
                        = "scaleX(-1)";
                }
                else if (!flipX && videoTransform === 'scaleX(-1)') {
                    document.getElementById('largeVideo').style.webkitTransform
                        = "none";
                }

                // Change the way we'll be measuring and positioning large video

                getVideoSize = isDesktop
                                ? getDesktopVideoSize
                                : getCameraVideoSize;
                getVideoPosition = isDesktop
                                    ? getDesktopVideoPosition
                                    : getCameraVideoPosition;

                if (isVisible) {
                    // Only if the large video is currently visible.
                    // Disable previous dominant speaker video.
                    var oldJid = getJidFromVideoSrc(oldSrc);
                    if (oldJid) {
                        var oldResourceJid = Strophe.getResourceFromJid(oldJid);
                        VideoLayout.enableDominantSpeaker(oldResourceJid, false);
                    }

                    // Enable new dominant speaker in the remote videos section.
                    var userJid = getJidFromVideoSrc(newSrc);
                    if (userJid)
                    {
                        var resourceJid = Strophe.getResourceFromJid(userJid);
                        VideoLayout.enableDominantSpeaker(resourceJid, true);
                    }

                    $(this).fadeIn(300);
                }
            });
        }
    };

    my.handleVideoThumbClicked = function(videoSrc) {
        // Restore style for previously focused video
        var focusJid = getJidFromVideoSrc(focusedVideoSrc);
        var oldContainer = getParticipantContainer(focusJid);

        if (oldContainer) {
            oldContainer.removeClass("videoContainerFocused");
        }

        // Unlock current focused. 
        if (focusedVideoSrc === videoSrc)
        {
            focusedVideoSrc = null;
            var dominantSpeakerVideo = null;
            // Enable the currently set dominant speaker.
            if (currentDominantSpeaker) {
                dominantSpeakerVideo
                    = $('#participant_' + currentDominantSpeaker + '>video')
                        .get(0);

                if (dominantSpeakerVideo) {
                    VideoLayout.updateLargeVideo(dominantSpeakerVideo.src, 1);
                }
            }

            return;
        }

        // Lock new video
        focusedVideoSrc = videoSrc;

        // Update focused/pinned interface.
        var userJid = getJidFromVideoSrc(videoSrc);
        if (userJid)
        {
            var container = getParticipantContainer(userJid);
            container.addClass("videoContainerFocused");
        }

        // Triggers a "video.selected" event. The "false" parameter indicates
        // this isn't a prezi.
        $(document).trigger("video.selected", [false]);

        VideoLayout.updateLargeVideo(videoSrc, 1);

        $('audio').each(function (idx, el) {
            if (el.id.indexOf('mixedmslabel') !== -1) {
                el.volume = 0;
                el.volume = 1;
            }
        });
    };

    /**
     * Positions the large video.
     *
     * @param videoWidth the stream video width
     * @param videoHeight the stream video height
     */
    my.positionLarge = function (videoWidth, videoHeight) {
        var videoSpaceWidth = $('#videospace').width();
        var videoSpaceHeight = window.innerHeight;

        var videoSize = getVideoSize(videoWidth,
                                     videoHeight,
                                     videoSpaceWidth,
                                     videoSpaceHeight);

        var largeVideoWidth = videoSize[0];
        var largeVideoHeight = videoSize[1];

        var videoPosition = getVideoPosition(largeVideoWidth,
                                             largeVideoHeight,
                                             videoSpaceWidth,
                                             videoSpaceHeight);

        var horizontalIndent = videoPosition[0];
        var verticalIndent = videoPosition[1];

        positionVideo($('#largeVideo'),
                      largeVideoWidth,
                      largeVideoHeight,
                      horizontalIndent, verticalIndent);
    };

    /**
     * Shows/hides the large video.
     */
    my.setLargeVideoVisible = function(isVisible) {
        var largeVideoJid = getJidFromVideoSrc($('#largeVideo').attr('src'));
        var resourceJid = Strophe.getResourceFromJid(largeVideoJid);

        if (isVisible) {
            $('#largeVideo').css({visibility: 'visible'});
            $('.watermark').css({visibility: 'visible'});
            VideoLayout.enableDominantSpeaker(resourceJid, true);
        }
        else {
            $('#largeVideo').css({visibility: 'hidden'});
            $('.watermark').css({visibility: 'hidden'});
            VideoLayout.enableDominantSpeaker(resourceJid, false);
        }
    };

    /**
     * Indicates if the large video is currently visible.
     *
     * @return <tt>true</tt> if visible, <tt>false</tt> - otherwise
     */
    my.isLargeVideoVisible = function() {
        return $('#largeVideo').is(':visible');
    };

    /**
     * Checks if container for participant identified by given peerJid exists
     * in the document and creates it eventually.
     * 
     * @param peerJid peer Jid to check.
     * 
     * @return Returns <tt>true</tt> if the peer container exists,
     * <tt>false</tt> - otherwise
     */
    my.ensurePeerContainerExists = function(peerJid) {
        ContactList.ensureAddContact(peerJid);

        var resourceJid = Strophe.getResourceFromJid(peerJid);

        var videoSpanId = 'participant_' + resourceJid;

        if ($('#' + videoSpanId).length > 0) {
            // If there's been a focus change, make sure we add focus related
            // interface!!
            if (focus && $('#remote_popupmenu_' + resourceJid).length <= 0)
                addRemoteVideoMenu( peerJid,
                                    document.getElementById(videoSpanId));
        }
        else {
            var container
                = VideoLayout.addRemoteVideoContainer(peerJid, videoSpanId);

            // Set default display name.
            setDisplayName(videoSpanId);

            var nickfield = document.createElement('span');
            nickfield.className = "nick";
            nickfield.appendChild(document.createTextNode(resourceJid));
            container.appendChild(nickfield);

            // In case this is not currently in the last n we don't show it.
            if (lastNCount
                && lastNCount > 0
                && $('#remoteVideos>span').length >= lastNCount + 2) {
                showPeerContainer(resourceJid, false);
            }
            else
                VideoLayout.resizeThumbnails();
        }
    };

    my.addRemoteVideoContainer = function(peerJid, spanId) {
        var container = document.createElement('span');
        container.id = spanId;
        container.className = 'videocontainer';
        var remotes = document.getElementById('remoteVideos');

        // If the peerJid is null then this video span couldn't be directly
        // associated with a participant (this could happen in the case of prezi).
        if (focus && peerJid != null)
            addRemoteVideoMenu(peerJid, container);

        remotes.appendChild(container);
        AudioLevels.updateAudioLevelCanvas(peerJid);

        return container;
    };

    /**
     * Creates an audio or video stream element.
     */
    my.createStreamElement = function (sid, stream) {
        var isVideo = stream.getVideoTracks().length > 0;

        var element = isVideo
                        ? document.createElement('video')
                        : document.createElement('audio');
        var id = (isVideo ? 'remoteVideo_' : 'remoteAudio_')
                    + sid + '_' + stream.id;

        element.id = id;
        element.autoplay = true;
        element.oncontextmenu = function () { return false; };

        return element;
    };

    my.addRemoteStreamElement
        = function (container, sid, stream, peerJid, thessrc) {
        var newElementId = null;

        var isVideo = stream.getVideoTracks().length > 0;

        if (container) {
            var streamElement = VideoLayout.createStreamElement(sid, stream);
            newElementId = streamElement.id;

            container.appendChild(streamElement);

            var sel = $('#' + newElementId);
            sel.hide();

            // If the container is currently visible we attach the stream.
            if (!isVideo
                || (container.offsetParent !== null && isVideo)) {
                var simulcast = new Simulcast();
                var videoStream = simulcast.getReceivingVideoStream(stream);
                RTC.attachMediaStream(sel, videoStream);

                if (isVideo)
                    waitForRemoteVideo(sel, thessrc, stream);
            }

            stream.onended = function () {
                console.log('stream ended', this);

                VideoLayout.removeRemoteStreamElement(stream, container);

                if (peerJid)
                    ContactList.removeContact(peerJid);
            };

            // Add click handler.
            container.onclick = function (event) {
                /*
                 * FIXME It turns out that videoThumb may not exist (if there is
                 * no actual video).
                 */
                var videoThumb = $('#' + container.id + '>video').get(0);

                if (videoThumb)
                    VideoLayout.handleVideoThumbClicked(videoThumb.src);

                event.preventDefault();
                return false;
            };

            // Add hover handler
            $(container).hover(
                function() {
                    VideoLayout.showDisplayName(container.id, true);
                },
                function() {
                    var videoSrc = null;
                    if ($('#' + container.id + '>video')
                            && $('#' + container.id + '>video').length > 0) {
                        videoSrc = $('#' + container.id + '>video').get(0).src;
                    }

                    // If the video has been "pinned" by the user we want to
                    // keep the display name on place.
                    if (!VideoLayout.isLargeVideoVisible()
                            || videoSrc !== $('#largeVideo').attr('src'))
                        VideoLayout.showDisplayName(container.id, false);
                }
            );
        }

        return newElementId;
    };

    /**
     * Removes the remote stream element corresponding to the given stream and
     * parent container.
     * 
     * @param stream the stream
     * @param container
     */
    my.removeRemoteStreamElement = function (stream, container) {
        if (!container)
            return;

        var select = null;
        var removedVideoSrc = null;
        if (stream.getVideoTracks().length > 0) {
            select = $('#' + container.id + '>video');
            removedVideoSrc = select.get(0).src;
        }
        else
            select = $('#' + container.id + '>audio');

        // Remove video source from the mapping.
        delete videoSrcToSsrc[removedVideoSrc];

        // Mark video as removed to cancel waiting loop(if video is removed
        // before has started)
        select.removed = true;
        select.remove();

        var audioCount = $('#' + container.id + '>audio').length;
        var videoCount = $('#' + container.id + '>video').length;

        if (!audioCount && !videoCount) {
            console.log("Remove whole user", container.id);
            // Remove whole container
            container.remove();
            Util.playSoundNotification('userLeft');
            VideoLayout.resizeThumbnails();
        }

        if (removedVideoSrc)
            VideoLayout.updateRemovedVideo(removedVideoSrc);
    };

    /**
     * Show/hide peer container for the given resourceJid.
     */
    function showPeerContainer(resourceJid, isShow) {
        var peerContainer = $('#participant_' + resourceJid);

        if (!peerContainer)
            return;

        if (!peerContainer.is(':visible') && isShow)
            peerContainer.show();
        else if (peerContainer.is(':visible') && !isShow)
            peerContainer.hide();
    };

    /**
     * Sets the display name for the given video span id.
     */
    function setDisplayName(videoSpanId, displayName) {
        var nameSpan = $('#' + videoSpanId + '>span.displayname');
        var defaultLocalDisplayName = "Me";

        // If we already have a display name for this video.
        if (nameSpan.length > 0) {
            var nameSpanElement = nameSpan.get(0);

            if (nameSpanElement.id === 'localDisplayName' &&
                $('#localDisplayName').text() !== displayName) {
                if (displayName && displayName.length > 0)
                    $('#localDisplayName').text(displayName + ' (me)');
                else
                    $('#localDisplayName').text(defaultLocalDisplayName);
            } else {
                if (displayName && displayName.length > 0)
                    $('#' + videoSpanId + '_name').text(displayName);
                else
                    $('#' + videoSpanId + '_name').text(defaultRemoteDisplayName);
            }
        } else {
            var editButton = null;

            nameSpan = document.createElement('span');
            nameSpan.className = 'displayname';
            $('#' + videoSpanId)[0].appendChild(nameSpan);

            if (videoSpanId === 'localVideoContainer') {
                editButton = createEditDisplayNameButton();
                nameSpan.innerText = defaultLocalDisplayName;
            }
            else {
                nameSpan.innerText = defaultRemoteDisplayName;
            }

            if (displayName && displayName.length > 0) {
                nameSpan.innerText = displayName;
            }

            if (!editButton) {
                nameSpan.id = videoSpanId + '_name';
            } else {
                nameSpan.id = 'localDisplayName';
                $('#' + videoSpanId)[0].appendChild(editButton);

                var editableText = document.createElement('input');
                editableText.className = 'displayname';
                editableText.type = 'text';
                editableText.id = 'editDisplayName';

                if (displayName && displayName.length) {
                    editableText.value
                        = displayName.substring(0, displayName.indexOf(' (me)'));
                }

                editableText.setAttribute('style', 'display:none;');
                editableText.setAttribute('placeholder', 'ex. Jane Pink');
                $('#' + videoSpanId)[0].appendChild(editableText);

                $('#localVideoContainer .displayname')
                    .bind("click", function (e) {

                    e.preventDefault();
                    $('#localDisplayName').hide();
                    $('#editDisplayName').show();
                    $('#editDisplayName').focus();
                    $('#editDisplayName').select();

                    var inputDisplayNameHandler = function (name) {
                        if (nickname !== name) {
                            nickname = name;
                            window.localStorage.displayname = nickname;
                            connection.emuc.addDisplayNameToPresence(nickname);
                            connection.emuc.sendPresence();

                            Chat.setChatConversationMode(true);
                        }

                        if (!$('#localDisplayName').is(":visible")) {
                            if (nickname)
                                $('#localDisplayName').text(nickname + " (me)");
                            else
                                $('#localDisplayName')
                                    .text(defaultLocalDisplayName);
                            $('#localDisplayName').show();
                        }

                        $('#editDisplayName').hide();
                    };

                    $('#editDisplayName').one("focusout", function (e) {
                        inputDisplayNameHandler(this.value);
                    });

                    $('#editDisplayName').on('keydown', function (e) {
                        if (e.keyCode === 13) {
                            e.preventDefault();
                            inputDisplayNameHandler(this.value);
                        }
                    });
                });
            }
        }
    };

    /**
     * Shows/hides the display name on the remote video.
     * @param videoSpanId the identifier of the video span element
     * @param isShow indicates if the display name should be shown or hidden
     */
    my.showDisplayName = function(videoSpanId, isShow) {
        var nameSpan = $('#' + videoSpanId + '>span.displayname').get(0);
        if (isShow) {
            if (nameSpan && nameSpan.innerHTML && nameSpan.innerHTML.length) 
                nameSpan.setAttribute("style", "display:inline-block;");
        }
        else {
            if (nameSpan)
                nameSpan.setAttribute("style", "display:none;");
        }
    };

    /**
     * Shows the presence status message for the given video.
     */
    my.setPresenceStatus = function (videoSpanId, statusMsg) {

        if (!$('#' + videoSpanId).length) {
            // No container
            return;
        }

        var statusSpan = $('#' + videoSpanId + '>span.status');
        if (!statusSpan.length) {
            //Add status span
            statusSpan = document.createElement('span');
            statusSpan.className = 'status';
            statusSpan.id = videoSpanId + '_status';
            $('#' + videoSpanId)[0].appendChild(statusSpan);

            statusSpan = $('#' + videoSpanId + '>span.status');
        }

        // Display status
        if (statusMsg && statusMsg.length) {
            $('#' + videoSpanId + '_status').text(statusMsg);
            statusSpan.get(0).setAttribute("style", "display:inline-block;");
        }
        else {
            // Hide
            statusSpan.get(0).setAttribute("style", "display:none;");
        }
    };

    /**
     * Shows a visual indicator for the focus of the conference.
     * Currently if we're not the owner of the conference we obtain the focus
     * from the connection.jingle.sessions.
     */
    my.showFocusIndicator = function() {
        if (focus !== null) {
            var indicatorSpan = $('#localVideoContainer .focusindicator');

            if (indicatorSpan.children().length === 0)
            {
                createFocusIndicatorElement(indicatorSpan[0]);
            }
        }
        else if (Object.keys(connection.jingle.sessions).length > 0) {
            // If we're only a participant the focus will be the only session we have.
            var session
                = connection.jingle.sessions
                    [Object.keys(connection.jingle.sessions)[0]];
            var focusId
                = 'participant_' + Strophe.getResourceFromJid(session.peerjid);

            var focusContainer = document.getElementById(focusId);
            if (!focusContainer) {
                console.error("No focus container!");
                return;
            }
            var indicatorSpan = $('#' + focusId + ' .focusindicator');

            if (!indicatorSpan || indicatorSpan.length === 0) {
                indicatorSpan = document.createElement('span');
                indicatorSpan.className = 'focusindicator';

                focusContainer.appendChild(indicatorSpan);

                createFocusIndicatorElement(indicatorSpan);
            }
        }
    };

    /**
     * Shows video muted indicator over small videos.
     */
    my.showVideoIndicator = function(videoSpanId, isMuted) {
        var videoMutedSpan = $('#' + videoSpanId + '>span.videoMuted');

        if (isMuted === 'false') {
            if (videoMutedSpan.length > 0) {
                videoMutedSpan.remove();
            }
        }
        else {
            var audioMutedSpan = $('#' + videoSpanId + '>span.audioMuted');

            videoMutedSpan = document.createElement('span');
            videoMutedSpan.className = 'videoMuted';
            if (audioMutedSpan) {
                videoMutedSpan.right = '30px';
            }
            $('#' + videoSpanId)[0].appendChild(videoMutedSpan);

            var mutedIndicator = document.createElement('i');
            mutedIndicator.className = 'icon-camera-disabled';
            Util.setTooltip(mutedIndicator,
                    "Participant has<br/>stopped the camera.",
                    "top");
            videoMutedSpan.appendChild(mutedIndicator);
        }
    };

    /**
     * Shows audio muted indicator over small videos.
     */
    my.showAudioIndicator = function(videoSpanId, isMuted) {
        var audioMutedSpan = $('#' + videoSpanId + '>span.audioMuted');

        if (isMuted === 'false') {
            if (audioMutedSpan.length > 0) {
                audioMutedSpan.popover('hide');
                audioMutedSpan.remove();
            }
        }
        else {
            var videoMutedSpan = $('#' + videoSpanId + '>span.videoMuted');

            audioMutedSpan = document.createElement('span');
            audioMutedSpan.className = 'audioMuted';
            Util.setTooltip(audioMutedSpan,
                    "Participant is muted",
                    "top");

            if (videoMutedSpan) {
                audioMutedSpan.right = '30px';
            }
            $('#' + videoSpanId)[0].appendChild(audioMutedSpan);

            var mutedIndicator = document.createElement('i');
            mutedIndicator.className = 'icon-mic-disabled';
            audioMutedSpan.appendChild(mutedIndicator);
        }
    };

    /**
     * Resizes the large video container.
     */
    my.resizeLargeVideoContainer = function () {
        Chat.resizeChat();
        var availableHeight = window.innerHeight;
        var availableWidth = Util.getAvailableVideoWidth();

        if (availableWidth < 0 || availableHeight < 0) return;

        $('#videospace').width(availableWidth);
        $('#videospace').height(availableHeight);
        $('#largeVideoContainer').width(availableWidth);
        $('#largeVideoContainer').height(availableHeight);

        VideoLayout.resizeThumbnails();
    };

    /**
     * Resizes thumbnails.
     */
    my.resizeThumbnails = function() {
        var videoSpaceWidth = $('#remoteVideos').width();

        var thumbnailSize = VideoLayout.calculateThumbnailSize(videoSpaceWidth);
        var width = thumbnailSize[0];
        var height = thumbnailSize[1];

        // size videos so that while keeping AR and max height, we have a
        // nice fit
        $('#remoteVideos').height(height);
        $('#remoteVideos>span').width(width);
        $('#remoteVideos>span').height(height);

        $(document).trigger("remotevideo.resized", [width, height]);
    };

    /**
     * Enables the dominant speaker UI.
     *
     * @param resourceJid the jid indicating the video element to
     * activate/deactivate
     * @param isEnable indicates if the dominant speaker should be enabled or
     * disabled
     */
    my.enableDominantSpeaker = function(resourceJid, isEnable) {
        var displayName = resourceJid;
        var nameSpan = $('#participant_' + resourceJid + '>span.displayname');
        if (nameSpan.length > 0)
            displayName = nameSpan.text();

        console.log("UI enable dominant speaker",
                    displayName,
                    resourceJid,
                    isEnable);

        var videoSpanId = null;
        var videoContainerId = null;
        if (resourceJid
                === Strophe.getResourceFromJid(connection.emuc.myroomjid)) {
            videoSpanId = 'localVideoWrapper';
            videoContainerId = 'localVideoContainer';
        }
        else {
            videoSpanId = 'participant_' + resourceJid;
            videoContainerId = videoSpanId;
        }

        videoSpan = document.getElementById(videoContainerId);

        if (!videoSpan) {
            console.error("No video element for jid", resourceJid);
            return;
        }

        var video = $('#' + videoSpanId + '>video');

        if (video && video.length > 0) {
            if (isEnable) {
                VideoLayout.showDisplayName(videoContainerId, true);

                if (!videoSpan.classList.contains("dominantspeaker"))
                    videoSpan.classList.add("dominantspeaker");

                video.css({visibility: 'hidden'});
            }
            else {
                VideoLayout.showDisplayName(videoContainerId, false);

                if (videoSpan.classList.contains("dominantspeaker"))
                    videoSpan.classList.remove("dominantspeaker");

                video.css({visibility: 'visible'});
            }
        }
    };

    /**
     * Gets the selector of video thumbnail container for the user identified by
     * given <tt>userJid</tt>
     * @param userJid user's Jid for whom we want to get the video container.
     */
    function getParticipantContainer(userJid)
    {
        if (!userJid)
            return null;

        if (userJid === connection.emuc.myroomjid)
            return $("#localVideoContainer");
        else
            return $("#participant_" + Strophe.getResourceFromJid(userJid));
    }

    /**
     * Sets the size and position of the given video element.
     *
     * @param video the video element to position
     * @param width the desired video width
     * @param height the desired video height
     * @param horizontalIndent the left and right indent
     * @param verticalIndent the top and bottom indent
     */
    function positionVideo(video,
                           width,
                           height,
                           horizontalIndent,
                           verticalIndent) {
        video.width(width);
        video.height(height);
        video.css({  top: verticalIndent + 'px',
                     bottom: verticalIndent + 'px',
                     left: horizontalIndent + 'px',
                     right: horizontalIndent + 'px'});
    }

    /**
     * Calculates the thumbnail size.
     *
     * @param videoSpaceWidth the width of the video space
     */
    my.calculateThumbnailSize = function (videoSpaceWidth) {
        // Calculate the available height, which is the inner window height minus
       // 39px for the header minus 2px for the delimiter lines on the top and
       // bottom of the large video, minus the 36px space inside the remoteVideos
       // container used for highlighting shadow.
       var availableHeight = 100;

       var numvids = 0;
       if (lastNCount && lastNCount > 0)
           numvids = lastNCount + 1;
       else
           numvids = $('#remoteVideos>span:visible').length;

       // Remove the 3px borders arround videos and border around the remote
       // videos area
       var availableWinWidth = videoSpaceWidth - 2 * 3 * numvids - 70;

       var availableWidth = availableWinWidth / numvids;
       var aspectRatio = 16.0 / 9.0;
       var maxHeight = Math.min(160, availableHeight);
       availableHeight = Math.min(maxHeight, availableWidth / aspectRatio);
       if (availableHeight < availableWidth / aspectRatio) {
           availableWidth = Math.floor(availableHeight * aspectRatio);
       }

       return [availableWidth, availableHeight];
   };

   /**
    * Returns an array of the video dimensions, so that it keeps it's aspect
    * ratio and fits available area with it's larger dimension. This method
    * ensures that whole video will be visible and can leave empty areas.
    *
    * @return an array with 2 elements, the video width and the video height
    */
   function getDesktopVideoSize(videoWidth,
                                videoHeight,
                                videoSpaceWidth,
                                videoSpaceHeight) {
       if (!videoWidth)
           videoWidth = currentVideoWidth;
       if (!videoHeight)
           videoHeight = currentVideoHeight;

       var aspectRatio = videoWidth / videoHeight;

       var availableWidth = Math.max(videoWidth, videoSpaceWidth);
       var availableHeight = Math.max(videoHeight, videoSpaceHeight);

       videoSpaceHeight -= $('#remoteVideos').outerHeight();

       if (availableWidth / aspectRatio >= videoSpaceHeight)
       {
           availableHeight = videoSpaceHeight;
           availableWidth = availableHeight * aspectRatio;
       }

       if (availableHeight * aspectRatio >= videoSpaceWidth)
       {
           availableWidth = videoSpaceWidth;
           availableHeight = availableWidth / aspectRatio;
       }

       return [availableWidth, availableHeight];
   }

   /**
    * Creates the edit display name button.
    * 
    * @returns the edit button
    */
    function createEditDisplayNameButton() {
        var editButton = document.createElement('a');
        editButton.className = 'displayname';
        Util.setTooltip(editButton,
                        'Click to edit your<br/>display name',
                        "top");
        editButton.innerHTML = '<i class="fa fa-pencil"></i>';

        return editButton;
    }

    /**
     * Creates the element indicating the focus of the conference.
     *
     * @param parentElement the parent element where the focus indicator will
     * be added
     */
    function createFocusIndicatorElement(parentElement) {
        var focusIndicator = document.createElement('i');
        focusIndicator.className = 'fa fa-star';
        parentElement.appendChild(focusIndicator);

        Util.setTooltip(parentElement,
                "The owner of<br/>this conference",
                "top");
    }

    /**
     * Updates the remote video menu.
     *
     * @param jid the jid indicating the video for which we're adding a menu.
     * @param isMuted indicates the current mute state
     */
    my.updateRemoteVideoMenu = function(jid, isMuted) {
        var muteMenuItem
            = $('#remote_popupmenu_'
                    + Strophe.getResourceFromJid(jid)
                    + '>li>a.mutelink');

        var mutedIndicator = "<i class='icon-mic-disabled'></i>";

        if (muteMenuItem.length) {
            var muteLink = muteMenuItem.get(0);

            if (isMuted === 'true') {
                muteLink.innerHTML = mutedIndicator + ' Muted';
                muteLink.className = 'mutelink disabled';
            }
            else {
                muteLink.innerHTML = mutedIndicator + ' Mute';
                muteLink.className = 'mutelink';
            }
        }
    };

    /**
     * Returns the current dominant speaker resource jid.
     */
    my.getDominantSpeakerResourceJid = function () {
        return currentDominantSpeaker;
    };

    /**
     * Returns the corresponding resource jid to the given peer container
     * DOM element.
     *
     * @return the corresponding resource jid to the given peer container
     * DOM element
     */
    my.getPeerContainerResourceJid = function (containerElement) {
        var i = containerElement.id.indexOf('participant_');

        if (i >= 0)
            return containerElement.id.substring(i + 12); 
    };

    /**
     * Adds the remote video menu element for the given <tt>jid</tt> in the
     * given <tt>parentElement</tt>.
     *
     * @param jid the jid indicating the video for which we're adding a menu.
     * @param parentElement the parent element where this menu will be added
     */
    function addRemoteVideoMenu(jid, parentElement) {
        var spanElement = document.createElement('span');
        spanElement.className = 'remotevideomenu';

        parentElement.appendChild(spanElement);

        var menuElement = document.createElement('i');
        menuElement.className = 'fa fa-angle-down';
        menuElement.title = 'Remote user controls';
        spanElement.appendChild(menuElement);

//        <ul class="popupmenu">
//        <li><a href="#">Mute</a></li>
//        <li><a href="#">Eject</a></li>
//        </ul>
        var popupmenuElement = document.createElement('ul');
        popupmenuElement.className = 'popupmenu';
        popupmenuElement.id
            = 'remote_popupmenu_' + Strophe.getResourceFromJid(jid);
        spanElement.appendChild(popupmenuElement);

        var muteMenuItem = document.createElement('li');
        var muteLinkItem = document.createElement('a');

        var mutedIndicator = "<i class='icon-mic-disabled'></i>";

        if (!mutedAudios[jid]) {
            muteLinkItem.innerHTML = mutedIndicator + 'Mute';
            muteLinkItem.className = 'mutelink';
        }
        else {
            muteLinkItem.innerHTML = mutedIndicator + ' Muted';
            muteLinkItem.className = 'mutelink disabled';
        }

        muteLinkItem.onclick = function(){
            if ($(this).attr('disabled') != undefined) {
                event.preventDefault();
            }
            var isMute = !mutedAudios[jid];
            connection.moderate.setMute(jid, isMute);
            popupmenuElement.setAttribute('style', 'display:none;');

            if (isMute) {
                this.innerHTML = mutedIndicator + ' Muted';
                this.className = 'mutelink disabled';
            }
            else {
                this.innerHTML = mutedIndicator + ' Mute';
                this.className = 'mutelink';
            }
        };

        muteMenuItem.appendChild(muteLinkItem);
        popupmenuElement.appendChild(muteMenuItem);

        var ejectIndicator = "<i class='fa fa-eject'></i>";

        var ejectMenuItem = document.createElement('li');
        var ejectLinkItem = document.createElement('a');
        ejectLinkItem.innerHTML = ejectIndicator + ' Kick out';
        ejectLinkItem.onclick = function(){
            connection.moderate.eject(jid);
            popupmenuElement.setAttribute('style', 'display:none;');
        };

        ejectMenuItem.appendChild(ejectLinkItem);
        popupmenuElement.appendChild(ejectMenuItem);
    }

    /**
     * On audio muted event.
     */
    $(document).bind('audiomuted.muc', function (event, jid, isMuted) {
        var videoSpanId = null;
        if (jid === connection.emuc.myroomjid) {
            videoSpanId = 'localVideoContainer';
        } else {
            VideoLayout.ensurePeerContainerExists(jid);
            videoSpanId = 'participant_' + Strophe.getResourceFromJid(jid);
        }

        if (focus) {
            mutedAudios[jid] = isMuted;
            VideoLayout.updateRemoteVideoMenu(jid, isMuted);
        }

        if (videoSpanId)
            VideoLayout.showAudioIndicator(videoSpanId, isMuted);
    });

    /**
     * On video muted event.
     */
    $(document).bind('videomuted.muc', function (event, jid, isMuted) {
        var videoSpanId = null;
        if (jid === connection.emuc.myroomjid) {
            videoSpanId = 'localVideoContainer';
        } else {
            VideoLayout.ensurePeerContainerExists(jid);
            videoSpanId = 'participant_' + Strophe.getResourceFromJid(jid);
        }

        if (videoSpanId)
            VideoLayout.showVideoIndicator(videoSpanId, isMuted);
    });

    /**
     * Display name changed.
     */
    $(document).bind('displaynamechanged',
                    function (event, jid, displayName, status) {
        if (jid === 'localVideoContainer'
            || jid === connection.emuc.myroomjid) {
            setDisplayName('localVideoContainer',
                           displayName);
        } else {
            VideoLayout.ensurePeerContainerExists(jid);

            setDisplayName(
                'participant_' + Strophe.getResourceFromJid(jid),
                displayName,
                status);
        }
    });

    /**
     * On dominant speaker changed event.
     */
    $(document).bind('dominantspeakerchanged', function (event, resourceJid) {
        // We ignore local user events.
        if (resourceJid
                === Strophe.getResourceFromJid(connection.emuc.myroomjid))
            return;

        // Update the current dominant speaker.
        if (resourceJid !== currentDominantSpeaker) {
            var oldSpeakerVideoSpanId = "participant_" + currentDominantSpeaker,
                newSpeakerVideoSpanId = "participant_" + resourceJid;
            if($("#" + oldSpeakerVideoSpanId + ">span.displayname").text() === defaultDominantSpeakerDisplayName) {
                setDisplayName(oldSpeakerVideoSpanId, null);
            }
            if($("#" + newSpeakerVideoSpanId + ">span.displayname").text() === defaultRemoteDisplayName) {
                setDisplayName(newSpeakerVideoSpanId, defaultDominantSpeakerDisplayName);
            }
            currentDominantSpeaker = resourceJid;
        } else {
            return;
        }

        // Obtain container for new dominant speaker.
        var container  = document.getElementById(
                'participant_' + resourceJid);

        // Local video will not have container found, but that's ok
        // since we don't want to switch to local video.
        if (container && !focusedVideoSrc)
        {
            var video = container.getElementsByTagName("video");

            // Update the large video if the video source is already available,
            // otherwise wait for the "videoactive.jingle" event.
            if (video.length && video[0].currentTime > 0)
                VideoLayout.updateLargeVideo(video[0].src);
        }
    });

    /**
     * On last N change event.
     *
     * @param event the event that notified us
     * @param lastNEndpoints the list of last N endpoints
     * @param endpointsEnteringLastN the list currently entering last N
     * endpoints
     */
    $(document).bind('lastnchanged', function ( event,
                                                lastNEndpoints,
                                                endpointsEnteringLastN,
                                                stream) {
        if (lastNCount !== lastNEndpoints.length)
            lastNCount = lastNEndpoints.length;

        lastNEndpointsCache = lastNEndpoints;

        $('#remoteVideos>span').each(function( index, element ) {
            var resourceJid = VideoLayout.getPeerContainerResourceJid(element);

            if (resourceJid
                && lastNEndpoints.length > 0
                && lastNEndpoints.indexOf(resourceJid) < 0) {
                console.log("Remove from last N", resourceJid);
                showPeerContainer(resourceJid, false);
            }
        });

        if (!endpointsEnteringLastN || endpointsEnteringLastN.length < 0)
            endpointsEnteringLastN = lastNEndpoints;

        if (endpointsEnteringLastN && endpointsEnteringLastN.length > 0) {
            endpointsEnteringLastN.forEach(function (resourceJid) {

                if (!$('#participant_' + resourceJid).is(':visible')) {
                    console.log("Add to last N", resourceJid);
                    showPeerContainer(resourceJid, true);

                    mediaStreams.some(function (mediaStream) {
                        if (mediaStream.peerjid
                            && Strophe.getResourceFromJid(mediaStream.peerjid)
                                === resourceJid
                            && mediaStream.type === mediaStream.VIDEO_TYPE) {
                            var sel = $('#participant_' + resourceJid + '>video');

                            var simulcast = new Simulcast();
                            var videoStream = simulcast.getReceivingVideoStream(mediaStream.stream);
                            RTC.attachMediaStream(sel, videoStream);
                            waitForRemoteVideo(
                                    sel,
                                    mediaStream.ssrc,
                                    mediaStream.stream);
                            return true;
                        }
                    });
                }
            });
        }
    });

    $(document).bind('videoactive.jingle', function (event, videoelem) {
        if (videoelem.attr('id').indexOf('mixedmslabel') === -1) {
            // ignore mixedmslabela0 and v0

            videoelem.show();
            VideoLayout.resizeThumbnails();

            var videoParent = videoelem.parent();
            var parentResourceJid = null;
            if (videoParent)
                parentResourceJid
                    = VideoLayout.getPeerContainerResourceJid(videoParent[0]);

            // Update the large video to the last added video only if there's no
            // current dominant or focused speaker or update it to the current
            // dominant speaker.
            if ((!focusedVideoSrc && !VideoLayout.getDominantSpeakerResourceJid())
                || (parentResourceJid
                && VideoLayout.getDominantSpeakerResourceJid()
                    === parentResourceJid)) {
                VideoLayout.updateLargeVideo(videoelem.attr('src'), 1);
            }

            VideoLayout.showFocusIndicator();
        }
    });

    $(document).bind('simulcastlayerstarted', function(event) {
        var localVideoSelector = $('#' + 'localVideo_' + connection.jingle.localVideo.id);
        var simulcast = new Simulcast();
        var stream = simulcast.getLocalVideoStream();

        // Attach WebRTC stream
        RTC.attachMediaStream(localVideoSelector, stream);

        localVideoSrc = $(localVideoSelector).attr('src');
    });

    $(document).bind('simulcastlayerstopped', function(event) {
        var localVideoSelector = $('#' + 'localVideo_' + connection.jingle.localVideo.id);
        var simulcast = new Simulcast();
        var stream = simulcast.getLocalVideoStream();

        // Attach WebRTC stream
        RTC.attachMediaStream(localVideoSelector, stream);

        localVideoSrc = $(localVideoSelector).attr('src');
    });

    /**
     * On simulcast layers changed event.
     */
    $(document).bind('simulcastlayerschanged', function (event, endpointSimulcastLayers) {
        var simulcast = new Simulcast();
        endpointSimulcastLayers.forEach(function (esl) {

            var primarySSRC = esl.simulcastLayer.primarySSRC;
            var msid = simulcast.getRemoteVideoStreamIdBySSRC(primarySSRC);

            // Get session and stream from msid.
            var session, electedStream;
            var i, j, k;
            if (connection.jingle) {
                var keys = Object.keys(connection.jingle.sessions);
                for (i = 0; i < keys.length; i++) {
                    var sid = keys[i];

                    if (electedStream) {
                        // stream found, stop.
                        break;
                    }

                    session = connection.jingle.sessions[sid];
                    if (session.remoteStreams) {
                        for (j = 0; j < session.remoteStreams.length; j++) {
                            var remoteStream = session.remoteStreams[j];

                            if (electedStream) {
                                // stream found, stop.
                                break;
                            }
                            var tracks = remoteStream.getVideoTracks();
                            if (tracks) {
                                for (k = 0; k < tracks.length; k++) {
                                    var track = tracks[k];

                                    if (msid === [remoteStream.id, track.id].join(' ')) {
                                        electedStream = new webkitMediaStream([track]);
                                        // stream found, stop.
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }

            if (session && electedStream) {
                console.info('Switching simulcast substream.');
                console.info([esl, primarySSRC, msid, session, electedStream]);

                var msidParts = msid.split(' ');
                var selRemoteVideo = $(['#', 'remoteVideo_', session.sid, '_', msidParts[0]].join(''));

                var updateLargeVideo = (ssrc2jid[videoSrcToSsrc[selRemoteVideo.attr('src')]]
                    == ssrc2jid[videoSrcToSsrc[largeVideoNewSrc]]);
                var updateFocusedVideoSrc = (selRemoteVideo.attr('src') == focusedVideoSrc);

                var electedStreamUrl = webkitURL.createObjectURL(electedStream);
                selRemoteVideo.attr('src', electedStreamUrl);
                videoSrcToSsrc[selRemoteVideo.attr('src')] = primarySSRC;

                if (updateLargeVideo) {
                    VideoLayout.updateLargeVideo(electedStreamUrl);
                }

                if (updateFocusedVideoSrc) {
                    focusedVideoSrc = electedStreamUrl;
                }

            } else {
                console.error('Could not find a stream or a session.');
            }
        });
    });

    return my;
}(VideoLayout || {}));