Video conferencing skeleton.

css/base.css

@@ -309,6 +309,11 @@ ul.menu > li.separator:hover {
   background-color: #ccc;
 }
 
+ul.menu > li.disabled {
+  pointer-events: none;
+  opacity: 0.6;
+}
+
 /* The down arrow head - trigger for context menu */
 .menuTrigger {
   position: absolute;
@@ -3242,3 +3247,87 @@ ul.phone-country-selector span.country {
     width: unset;
   }
 }
+
+/* Video conferencing. */
+.call-party-speaking {
+  border: 2px solid red;
+}
+
+.call-party.carousel-item .caller-name.inactive {
+  position: absolute;
+  bottom: 0.25rem;
+  right: 0.25rem;
+}
+
+.call-party.carousel-item .muted {
+  position: absolute;
+  top: 0.25rem;
+  right: 0.25rem;
+}
+
+.avatar-box.carousel-item {
+  /* Center the avatar in parent view. */
+  width: 45px;
+  height: 45px;
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  transform: translate(-50%, -50%);
+}
+
+#carousel-wrapper {
+  width: 100%;
+  max-width: 800px;
+  position: relative;
+  align-self: center;
+  padding-top: 1rem;
+}
+
+#carousel {
+  overflow: auto;
+  scroll-behavior: smooth;
+  scrollbar-width: none;
+}
+
+#carousel-prev, #carousel-next {
+  display: flex;
+  justify-content: center;
+  align-content: center;
+  background: white;
+  border: none;
+  padding: 8px;
+  border-radius: 50%;
+  outline: 0;
+  cursor: pointer;
+  position: absolute;
+  min-width: unset;
+  height: unset;
+}
+
+#carousel-prev {
+  top: 50%;
+  left: 0;
+  transform: translate(50%, -50%);
+  display: none;
+}
+
+#carousel-next {
+  top: 50%;
+  right: 0;
+  transform: translate(-50%, -50%);
+}
+
+#carousel-content {
+  display: grid;
+  justify-content: center;
+  grid-gap: 16px;
+  grid-auto-flow: column;
+  margin: auto;
+  box-sizing: border-box;
+}
+
+.carousel-item {
+  width: 180px;
+  height: 100px;
+  position: relative;
+}

src/lib/formatters.js

@@ -136,6 +136,8 @@ export function fullFormatter(style, data, values, key, stack) {
         attr.callState = data.state;
         attr.incoming = data.incoming;
         attr.duration = data.duration;
+        attr.vc = data.vc;
+        attr.onCallJoin = this.onCallJoin;
       }
       break;
     case 'VD':

src/views/messages-view.jsx

@@ -19,6 +19,7 @@ import LogoView from './logo-view.jsx';
 import MetaMessage from '../widgets/meta-message.jsx';
 import PinnedMessages from '../widgets/pinned-messages.jsx';
 import SendMessage from '../widgets/send-message.jsx';
+import VCPanel from '../widgets/vc-panel.jsx';
 import VideoPreview from '../widgets/video-preview.jsx';
 
 import { DEFAULT_P2P_ACCESS_MODE, EDIT_PREVIEW_LENGTH, IMAGE_PREVIEW_DIM, IMMEDIATE_P2P_SUBSCRIPTION,
@@ -1440,6 +1441,8 @@ class MessagesView extends React.Component {
             onSendMessage={this.sendFileAttachment} />
         );
       } else if (this.state.rtcPanel) {
+        // P2P call.
+        if (this.state.rtcPanel.startsWith("usr")) {
           component2 = (
             <CallPanel
               topic={this.state.topic}
@@ -1457,6 +1460,25 @@ class MessagesView extends React.Component {
               onIceCandidate={this.props.onCallIceCandidate}
               onSendAnswer={this.props.onCallSendAnswer} />
           );
+        } else {
+          // Video conference or stream.
+          component2 = (
+            <VCPanel
+              topic={this.state.topic}
+              seq={this.props.callSeq}
+              callState={this.props.callState}
+              callAudioOnly={this.props.callAudioOnly}
+              tinode={this.props.tinode}
+              title={this.state.title}
+              avatar={this.state.avatar || true}
+              myUid={this.props.myUserId}
+
+              onError={this.props.onError}
+              onHangup={this.handleCallHangup}
+              onCreateCall={this.props.onCallInvite}
+              onJoin={this.props.onVCJoin} />
+          );
+        }
       } else {
         const topic = this.props.tinode.getTopic(this.state.topic);
         const isChannel = topic.isChannelType();
@@ -1537,6 +1559,7 @@ class MessagesView extends React.Component {
             messageNodes.push(
               <ChatMessage
                 tinode={this.props.tinode}
+                topic={this.state.topic}
                 content={msg.content}
                 mimeType={msg.head && msg.head.mime}
                 replyToSeq={replyToSeq}
@@ -1563,6 +1586,7 @@ class MessagesView extends React.Component {
                 pickReply={this.handlePickReply}
                 editMessage={this.handleEditMessage}
                 onQuoteClick={this.handleQuoteClick}
+                onAcceptCall={this.props.onAcceptCall}
                 onError={this.props.onError}
                 ref={ref}
                 key={msg.seq} />

src/views/tinode-web.jsx

@@ -176,6 +176,7 @@ class TinodeWeb extends React.Component {
     this.handleCallSendOffer = this.handleCallSendOffer.bind(this);
     this.handleCallIceCandidate = this.handleCallIceCandidate.bind(this);
     this.handleCallSendAnswer = this.handleCallSendAnswer.bind(this);
+    this.handleVCCallJoin = this.handleVCCallJoin.bind(this);
 
     this.handleCallAccept = this.handleCallAccept.bind(this);
 
@@ -1591,7 +1592,7 @@ class TinodeWeb extends React.Component {
     }
 
     let muted = false, blocked = false, self_blocked = false, subscribed = false, deleter = false,
-      archived = false, webrtc = false;
+      archived = false, webrtc = false, writer = false;
     if (topic) {
       subscribed = topic.isSubscribed();
       archived = topic.isArchived();
@@ -1602,10 +1603,12 @@ class TinodeWeb extends React.Component {
         blocked = !acs.isJoiner();
         self_blocked = !acs.isJoiner('want');
         deleter = acs.isDeleter();
+        writer = acs.isWriter();
       }
     }
 
-    webrtc = !!this.tinode.getServerParam('iceServers');
+    webrtc = writer && !!this.tinode.getServerParam('iceServers');
+    const mediaServerAvailable = !!this.tinode.getServerParam('vcEndpoint');
 
     return [
       subscribed ? {
@@ -1616,8 +1619,9 @@ class TinodeWeb extends React.Component {
         title: this.props.intl.formatMessage(messages.menu_item_audio_call),
         handler: this.handleStartAudioCall
       } : null,
-      subscribed && Tinode.isP2PTopicName(topicName) && webrtc ? {
+      subscribed && webrtc ? {
         title: this.props.intl.formatMessage(messages.menu_item_video_call),
+        disabled: Tinode.isGroupTopicName(topicName) && !mediaServerAvailable,
         handler: this.handleStartVideoCall
       } : null,
       subscribed ? 'messages_clear' : null,
@@ -1772,13 +1776,19 @@ class TinodeWeb extends React.Component {
     switch (callState) {
       case CALL_STATE_OUTGOING_INITATED:
         const head = { webrtc: CALL_HEAD_STARTED, aonly: !!audioOnly };
-        this.handleSendMessage(Drafty.videoCall(audioOnly), undefined, undefined, head)
+        let msg = Drafty.videoCall(audioOnly);
+        if (Tinode.isGroupTopicName(callTopic)) {
+          // Video conference.
+          head.vc = true;
+        }
+        return this.handleSendMessage(msg, undefined, undefined, head)
           .then(ctrl => {
             if (ctrl.code < 200 || ctrl.code >= 300 || !ctrl.params || !ctrl.params.seq) {
               this.handleCallClose();
-              return;
+              return ctrl;
             }
             this.setState({callSeq: ctrl.params['seq']});
+            return ctrl
           });
         break;
       case CALL_STATE_IN_PROGRESS:
@@ -1836,6 +1846,15 @@ class TinodeWeb extends React.Component {
     topic.videoCall('answer', callSeq, sdp);
   }
 
+  handleVCCallJoin(callTopic, callSeq) {
+    const topic = this.tinode.getTopic(callTopic);
+    if (!topic) {
+      return;
+    }
+
+    topic.videoCall('vc-join', callSeq);
+  }
+
   handleCallClose() {
     if (this.callTimeoutTimer) {
       clearTimeout(this.callTimeoutTimer);
@@ -1847,16 +1866,21 @@ class TinodeWeb extends React.Component {
     });
   }
 
-  handleCallAccept(topicName) {
+  handleCallAccept(topicName, setCallTopic, callSeq) {
     const topic = this.tinode.getTopic(topicName);
     if (!topic) {
       return;
     }
     if (topic.isSubscribed()) {
-      this.handleTopicSelected(this.state.callTopic);
-      this.setState({
+      this.handleTopicSelected(setCallTopic ? topicName : this.state.callTopic);
+      let upd = {
         callState: CALL_STATE_IN_PROGRESS
-      });
+      }
+      if (setCallTopic) {
+        upd.callTopic = topicName;
+        upd.callSeq = callSeq;
+      }
+      this.setState(upd);
     } else {
       // We need to switch and subscribe to callTopic first.
       this.setState({
@@ -1894,7 +1918,7 @@ class TinodeWeb extends React.Component {
   }
 
   handleDataMessage(data) {
-    if (data.head && data.head.webrtc && data.head.webrtc == CALL_HEAD_STARTED) {
+    if (data.head && data.head.webrtc && data.head.webrtc == CALL_HEAD_STARTED && Tinode.isP2PTopicName(data.topic)) {
       // If it's a video call invite message.
       // See if we need to display incoming call UI.
       const topic = this.tinode.getTopic(data.topic);
@@ -2089,11 +2113,13 @@ class TinodeWeb extends React.Component {
             callState={this.state.callState}
             callAudioOnly={this.state.callAudioOnly}
             onCallHangup={this.handleCallHangup}
+            onAcceptCall={this.handleCallAccept}
 
             onCallInvite={this.handleCallInvite}
             onCallSendOffer={this.handleCallSendOffer}
             onCallIceCandidate={this.handleCallIceCandidate}
             onCallSendAnswer={this.handleCallSendAnswer}
+            onVCJoin={this.handleVCCallJoin}
 
             errorText={this.state.errorText}
             errorLevel={this.state.errorLevel}

src/widgets/call-message.jsx

@@ -7,11 +7,17 @@ import { secondsToTime } from '../lib/strformat.js';
 
 export default class CallMessage extends React.PureComponent {
   render() {
+    const bigIcon = this.props.vc ? 'video_call' : 'call';
     const isCallDropped = ['busy', 'declined', 'disconnected', 'missed'].includes(this.props.callState);
     const successClass = 'material-icons medium ' + (isCallDropped ? 'red' : 'green');
     const callIcon = this.props.incoming ?
       (isCallDropped ? 'call_missed' : 'call_received') :
       (isCallDropped ? 'call_missed_outgoing' : 'call_made');
+    const title = this.props.vc ?
+      <FormattedMessage id="calls_conference" defaultMessage="Conference call" description="Conference call label" /> :
+      this.props.incoming ?
+          <FormattedMessage id="calls_incoming" defaultMessage="Incoming call" description="Incoming call label" /> :
+          <FormattedMessage id="calls_outgoing" defaultMessage="Outgoing call" description="Outgoing call label" />;
     let duration;
     if (isCallDropped) {
       switch (this.props.callState) {
@@ -33,14 +39,15 @@ export default class CallMessage extends React.PureComponent {
     } else {
       duration = <span>{secondsToTime(this.props.duration / 1000)}</span>;
     }
+    const allowJoin = this.props.vc && this.props.callState == 'started';
     return <div className="call-message">
-      <div><i className="material-icons big gray">call</i></div>
+      <div><i className="material-icons big gray">{bigIcon}</i></div>
       <div className="flex-column narrow">
-        <div>{this.props.incoming ?
-          <FormattedMessage id="calls_incoming" defaultMessage="Incoming call" description="Incoming call label" /> :
-          <FormattedMessage id="calls_outgoing" defaultMessage="Outgoing call" description="Outgoing call label" />
-        }</div>
+        <div>{title}</div>
         <div className="duration"><i className={successClass}>{callIcon}</i> {duration}</div>
+        {allowJoin ?
+          <a onClick={this.props.onCallJoin}>Join</a>
+          : null}
       </div>
     </div>;
   }

src/widgets/chat-message.jsx

@@ -29,6 +29,7 @@ class BaseChatMessage extends React.PureComponent {
     this.handleContextClick = this.handleContextClick.bind(this);
     this.handleCancelUpload = this.handleCancelUpload.bind(this);
     this.handleQuoteClick = this.handleQuoteClick.bind(this);
+    this.handleCallJoin = this.handleCallJoin.bind(this);
 
     this.formatterContext = {
       formatMessage: props.intl.formatMessage.bind(props.intl),
@@ -38,7 +39,8 @@ class BaseChatMessage extends React.PureComponent {
       onImagePreview: this.handleExpandImage,
       onVideoPreview: this.handlePlayVideo,
       onFormButtonClick: this.handleFormButtonClick,
-      onQuoteClick: this.handleQuoteClick
+      onQuoteClick: this.handleQuoteClick,
+      onCallJoin: this.handleCallJoin
     };
   }
 
@@ -149,6 +151,10 @@ class BaseChatMessage extends React.PureComponent {
     }
   }
 
+  handleCallJoin() {
+    this.props.onAcceptCall(this.props.topic, true, this.props.seq);
+  }
+
   render() {
     const sideClass = this.props.sequence + ' ' + (this.props.response ? 'left' : 'right');
     const bubbleClass = (this.props.sequence == 'single' || this.props.sequence == 'last') ? 'bubble tip' : 'bubble';

src/widgets/context-menu.jsx

@@ -493,11 +493,12 @@ class ContextMenu extends React.Component {
         item = this.MenuItems[item];
       }
       if (item && item.title) {
+        const className = item.disabled ? 'disabled' : undefined;
         menu.push(
           item.title == '-' ?
             <li className="separator" key={count} />
             :
-            <li onClick={this.handleClick} data-id={count} key={count}>{item.title}</li>
+            <li className={className} onClick={this.handleClick} data-id={count} key={count}>{item.title}</li>
         );
       }
       count++;

src/widgets/vc-carousel-item.jsx

@@ -0,0 +1,94 @@
+// Video conference carousel item.
+import React from 'react';
+import { injectIntl } from 'react-intl';
+import {
+  Track,
+} from 'livekit-client';
+
+import LetterTile from './letter-tile.jsx';
+
+class VCCarouselItem extends React.PureComponent {
+  constructor(props) {
+    super(props);
+
+    this.state = {
+      videoRef: undefined,
+      audioRef: undefined
+    };
+
+    this.handleVideoRefChange = this.handleVideoRefChange.bind(this);
+    this.handleAudioRefChange = this.handleAudioRefChange.bind(this);
+  }
+
+  componentDidUpdate(prevProps) {
+    if (this.state.videoRef && !this.state.videoRef.srcObject && this.props.cameraPub && this.props.cameraPub.videoTrack) {
+      this.props.cameraPub.videoTrack.attach(this.state.videoRef);
+    }
+    if (this.state.audioRef && !this.state.audioRef.srcObject && this.props.micPub && this.props.micPub.audioTrack) {
+      this.props.micPub.audioTrack.attach(this.state.audioRef);
+    }
+  }
+  
+  handleVideoRefChange(node) {
+    if (!node) { return; }
+    this.setState({videoRef: node});
+
+    // Attach video track to video element.
+    const cameraPub = this.props.cameraPub;
+    const cameraEnabled = cameraPub && cameraPub.isSubscribed && !cameraPub.isMuted;
+    if (cameraEnabled && cameraPub.videoTrack) {
+      cameraPub.videoTrack.attach(node);
+    }
+  }
+
+  handleAudioRefChange(node) {
+    if (!node) { return; }
+    this.setState({audioRef: node});
+
+    // Attach audio track to audio element.
+    const micPub = this.props.micPub;
+    const micEnabled = micPub && micPub.isSubscribed && !micPub.isMuted;
+    if (micEnabled && this.state.audioTrack) {
+      this.state.audioTrack.attach(node);
+    }
+  }
+
+  render() {
+    const name = this.props.name;
+    let classes = "call-party carousel-item";
+    if (this.props.isSpeaking) {
+      classes += " call-party-speaking";
+    }
+
+    const micPub = this.props.micPub;
+    const cameraPub = this.props.cameraPub;
+    return (
+      <div className={classes} key={this.props.key}>
+        <>
+          <video ref={this.handleVideoRefChange}></video>
+          <audio ref={this.handleAudioRefChange}></audio>
+          {micPub && micPub.isMuted ?
+            <i className="material-icons muted">mic_off</i>
+            : null
+          }
+          {cameraPub && cameraPub.isMuted ?
+            <>
+              <div className="avatar-box carousel-item">
+                <LetterTile
+                  tinode={this.props.tinode}
+                  avatar={this.props.photo}
+                  topic={this.props.identity}
+                  title={this.props.name} />
+              </div>
+            </>
+            : null}
+          <div className="caller-name inactive">
+            {this.props.name}
+          </div>
+        </>
+      </div>
+    );
+  }
+}
+
+export default injectIntl(VCCarouselItem);

src/widgets/vc-carousel.jsx

@@ -0,0 +1,102 @@
+import React from 'react';
+import { injectIntl } from 'react-intl';
+import {
+  Track,
+} from 'livekit-client';
+
+import LetterTile from './letter-tile.jsx';
+import VCCarouselItem from './vc-carousel-item.jsx';
+
+class VCCarousel extends React.Component {
+  constructor(props) {
+    super(props);
+    this.handlePrevClick = this.handlePrevClick.bind(this);
+    this.handleNextClick = this.handleNextClick.bind(this);
+ 
+    this.carouselRef = React.createRef();
+    this.contentRef = React.createRef();
+    this.prevRef = React.createRef();
+    this.nextRef = React.createRef();
+  }
+
+  handlePrevClick() {
+    const gap = 16;
+    const width = this.carouselRef.current.offsetWidth;
+    this.carouselRef.current.scrollBy(-(width + gap), 0);
+    if (this.carouselRef.current.scrollLeft - width - gap <= 0) {
+      this.prevRef.current.style.display = "none";
+    }
+    if (!this.contentRef.current.scrollWidth - width - gap <= this.carouselRef.current.scrollLeft + width) {
+      this.nextRef.current.style.display = "flex";
+    }
+  }
+
+  handleNextClick() {
+    const gap = 16;
+    const width = this.carouselRef.current.offsetWidth;
+    this.carouselRef.current.scrollBy(width + gap, 0);
+    if (this.carouselRef.current.scrollWidth !== 0) {
+      this.prevRef.current.style.display = "flex";
+    }
+    if (this.contentRef.current.scrollWidth - width - gap <= this.carouselRef.current.scrollLeft + width) {
+      this.nextRef.current.style.display = "none";
+    }
+  }
+
+  render() {
+    let peers = [];
+    if (this.props.participants) {
+      Object.entries(this.props.participants).forEach(([identity, party], i) => {
+        const participant = party.participant;
+        const cameraPub = participant.getTrack(Track.Source.Camera);
+        const micPub = participant.getTrack(Track.Source.Microphone);
+
+        peers.push(<VCCarouselItem
+          tinode={this.props.tinode}
+          isSpeaking={participant.isSpeaking}
+          cameraPub={cameraPub ? cameraPub : null}
+          micPub={micPub ? micPub : null}
+          name={party.name}
+          identity={identity}
+          photo={party.photo}
+          key={i}
+        />);
+      });
+    }
+    return (
+      <>
+        <div id="carousel-wrapper">
+          <div id="carousel" ref={this.carouselRef}>
+            <div id="carousel-content" ref={this.contentRef}>
+              {peers}
+            </div>
+          </div>
+          <button id="carousel-prev" ref={this.prevRef} onClick={this.handlePrevClick}>
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              width="24"
+              height="24"
+              viewBox="0 0 24 24"
+            >
+              <path fill="none" d="M0 0h24v24H0V0z" />
+              <path d="M15.61 7.41L14.2 6l-6 6 6 6 1.41-1.41L11.03 12l4.58-4.59z" />
+            </svg>
+          </button>
+          <button id="carousel-next" ref={this.nextRef} onClick={this.handleNextClick}>
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              width="24"
+              height="24"
+              viewBox="0 0 24 24"
+            >
+              <path fill="none" d="M0 0h24v24H0V0z" />
+              <path d="M10.02 6L8.61 7.41 13.19 12l-4.58 4.59L10.02 18l6-6-6-6z" />
+            </svg>
+          </button>
+        </div>
+      </>
+    );
+  }
+}
+
+export default injectIntl(VCCarousel);

src/widgets/vc-panel.jsx

@@ -0,0 +1,424 @@
+// Video conference or broadcast: local and/or peer viewports and controls.
+import React from 'react';
+import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
+
+import {
+  connect,
+  LocalParticipant,
+  MediaDeviceFailure,
+  Participant,
+  ParticipantEvent,
+  RemoteParticipant,
+  RemoteTrack,
+  RemoteTrackPublication,
+  Room,
+  RoomEvent,
+  Track,
+  VideoPresets,
+} from 'livekit-client';
+
+import LetterTile from './letter-tile.jsx';
+import VCCarousel from './vc-carousel.jsx';
+import { makeImageUrl } from '../lib/blob-helpers.js';
+
+import { MAX_PEER_TITLE_LENGTH } from '../config.js';
+import { CALL_STATE_OUTGOING_INITATED } from '../constants.js';
+
+import { clipStr } from '../lib/utils.js'
+
+class VCPanel extends React.PureComponent {
+  constructor(props) {
+    super(props);
+
+    this.state = {
+      room: undefined,
+
+      participants: {},
+      activeSpeaker: undefined,
+
+      previousOnInfo: undefined,
+    };
+
+    this.isOutgoingCall = props.callState == CALL_STATE_OUTGOING_INITATED;
+    const topic = this.props.tinode.getTopic(this.props.topic);
+    this.isBroadcast = topic && topic.chan;
+
+    this.localRef = React.createRef();
+    this.remoteRef = React.createRef();
+
+    this.onInfo = this.onInfo.bind(this);
+    this.start = this.start.bind(this);
+    this.stop = this.stop.bind(this);
+
+
+    this.reportError = this.reportError.bind(this);
+
+    this.handleCloseClick = this.handleCloseClick.bind(this);
+    this.handleToggleCameraClick = this.handleToggleCameraClick.bind(this);
+    this.handleToggleMicClick = this.handleToggleMicClick.bind(this);
+
+    this.handleRemoteHangup = this.handleRemoteHangup.bind(this);
+
+    this.handleTrackSubscribed2 = this.handleTrackSubscribed2.bind(this);
+    this.handleTrackUnsubscribed2 = this.handleTrackUnsubscribed2.bind(this);
+    this.handleActiveSpeakerChange2 = this.handleActiveSpeakerChange2.bind(this);
+    this.handleDisconnect2 = this.handleDisconnect2.bind(this);
+    this.handleLocalTrackUnpublished2 = this.handleLocalTrackUnpublished2.bind(this);
+    this.handleLocalTrackPublished2 = this.handleLocalTrackPublished2.bind(this);
+    this.handleParticipantConnected2 = this.handleParticipantConnected2.bind(this);
+    this.handleParticipantDisconnected2 = this.handleParticipantDisconnected2.bind(this);
+    this.handleData2 = this.handleData2.bind(this);
+    this.handleDevicesChanged = this.handleDevicesChanged.bind(this);
+    this.startRoom = this.startRoom.bind(this);
+
+    this.participants = {};
+  }
+
+  componentDidMount() {
+    const topic = this.props.tinode.getTopic(this.props.topic);
+    this.previousOnInfo = topic.onInfo;
+    topic.onInfo = this.onInfo;
+    this.start();
+  }
+
+  componentWillUnmount() {
+    const topic = this.props.tinode.getTopic(this.props.topic);
+    topic.onInfo = this.previousOnInfo;
+    this.stop();
+
+  }
+
+  onInfo(info) {
+    if (info.what != 'call') {
+      return;
+    }
+    switch (info.event) {
+      case 'vc-token':
+        const ts = info.payload;
+        this.setState({token: ts.token});
+        this.startRoom(ts.token);
+        break;
+      case 'hang-up':
+        this.handleRemoteHangup(info);
+        break;
+      default:
+        console.warn("Unknown call event", info.event);
+        break;
+    }
+  }
+
+
+  handleParticipantConnected2(participant) {
+    if (!participant) return;
+    if (participant instanceof RemoteParticipant) {
+      participant
+        .on(ParticipantEvent.TrackMuted, pub => {
+          console.log('track was muted', pub.trackSid, participant.identity);
+          this.forceUpdate();  // Redraw carousel.
+        })
+        .on(ParticipantEvent.TrackUnmuted, pub => {
+          console.log('track was unmuted', pub.trackSid, participant.identity);
+          this.forceUpdate();  // Redraw carousel.
+        })
+        .on(ParticipantEvent.IsSpeakingChanged, _ => {
+          this.forceUpdate();  // Redraw carousel.
+        })
+        .on(ParticipantEvent.ConnectionQualityChanged, _ => {
+          this.forceUpdate();  // Redraw carousel.
+        });
+
+      const me = this.props.tinode.getMeTopic();
+      const c = me.getContact(participant.identity);
+      const name = c && c.public && c.public.fn ? c.public.fn : participant.identity;
+      const photo = makeImageUrl(c && c.public ? c.public.photo : null);
+      const p = {
+        name: name,
+        photo: photo,
+        participant: participant
+      };
+      this.participants[participant.identity] = p
+      console.log('participant connected', this.participants);
+      this.setState({participants: this.participants}, _ => { this.forceUpdate(); });
+    }
+  }
+
+  handleParticipantDisconnected2(participant) {
+    console.log('Deleting participant ', participant.identity);
+    delete this.participants[participant.identity];
+    this.setState({participants: this.participants});
+  }
+
+  handleData2(msg, participant) {
+    console.log('Data message ', msg, participant);
+  }
+
+  handleTrackSubscribed2(track, publication, participant) {
+    if (participant instanceof RemoteParticipant) {
+      // Check if we're presenting a remote video stream.
+      if (this.remoteRef.current && !(this.remoteRef.current.src != '' || this.remoteRef.srcObject)) {
+        track.attach(this.remoteRef.current);
+      }
+    }
+    // Redraw the carousel and remote view.
+    this.forceUpdate();
+  }
+
+  handleTrackUnsubscribed2(track, publication, participant) {
+    console.log('handleTrackUnsubscribed2', track);
+    // remove tracks from all attached elements
+    track.detach();
+    this.forceUpdate();
+  }
+
+  handleLocalTrackPublished2(pub) {
+    console.log('Local track published', pub);
+    const track = pub.track;
+    if (this.localRef.current) {
+      const elem = this.localRef.current;
+      track.attach(elem);
+      // flip.
+      elem.style.transform = 'scale(-1, 1)';
+    }
+  }
+
+  handleLocalTrackUnpublished2(pub) {
+    const track = pub.track;
+    console.log('handleLocalTrackUnpublished2', track);
+    track.detach();
+    // Redraw carousel.
+    this.forceUpdate();
+  }
+
+  handleActiveSpeakerChange2(speakers) {
+    console.log('handleActiveSpeakerChange2', speakers);
+    speakers.forEach(s => {
+      if (s.isSpeaking) {
+        console.log('Speaking participant ', s);
+
+        // Display speaker in remote peer view.
+        const elem = this.remoteRef.current;
+        const me = this.props.tinode.getMeTopic();
+        const c = me.getContact(s.identity);
+        const name = c && c.public && c.public.fn ? c.public.fn : undefined;
+        this.setState({activeSpeaker: name});
+
+        const cameraPub = s.getTrack(Track.Source.Camera);
+        const cameraEnabled = cameraPub && cameraPub.isSubscribed && !cameraPub.isMuted;
+        if (cameraEnabled && cameraPub.videoTrack) {
+          cameraPub.videoTrack.attach(elem);
+        }
+      }
+    });
+  }
+
+  handleDevicesChanged() {
+    console.log('devices changed');
+    // TODO: implement.
+  }
+
+  handleDisconnect2() {
+    console.log('disconnected from room');
+    this.handleCloseClick();
+  }
+
+  startRoom(token) {
+    const roomOpts = {
+      adaptiveStream: true,
+      dynacast: true,
+      publishDefaults: {
+        simulcast: true,
+        videoSimulcastLayers: [VideoPresets.h90, VideoPresets.h216],
+        videoCodec: 'vp8'
+      },
+      videoCaptureDefaults: {
+        resolution: VideoPresets.h720.resolution
+      }
+    };
+
+    const connectOpts = {
+      autoSubscribe: true
+    };
+
+    // creates a new room with options
+    const room = new Room(roomOpts);
+
+    this.setState({room: room});
+
+    const startTime = Date.now();
+    const topic = this.props.tinode.getTopic(this.props.topic);
+    const shouldPublish = this.isOutgoingCall || !this.isBroadcast;
+
+    room
+      .on(RoomEvent.ParticipantConnected, this.handleParticipantConnected2)
+      .on(RoomEvent.ParticipantDisconnected, this.handleParticipantDisconnected2)
+      .on(RoomEvent.DataReceived, this.handleData2)
+      .on(RoomEvent.TrackSubscribed, this.handleTrackSubscribed2)
+      .on(RoomEvent.TrackUnsubscribed, this.handleTrackUnsubscribed2)
+      .on(RoomEvent.ActiveSpeakersChanged, this.handleActiveSpeakerChange2)
+      .on(RoomEvent.Disconnected, this.handleDisconnect2)
+      .on(RoomEvent.LocalTrackUnpublished, this.handleLocalTrackUnpublished2)
+      .on(RoomEvent.LocalTrackPublished, this.handleLocalTrackPublished2)
+
+      .on(RoomEvent.RoomMetadataChanged, metadata => {
+        console.log('VC room new metadata ', metadata);
+      })
+      .on(RoomEvent.MediaDevicesChanged, this.handleDevicesChanged)
+      .on(RoomEvent.AudioPlaybackStatusChanged, e => {
+        // TODO: handle it.
+        console.log('Audio playback status change: ', e);
+      })
+      .on(RoomEvent.MediaDevicesError, e => {
+        const failure = MediaDeviceFailure.getFailure(e);
+        this.reportError(failure);
+      })
+      .on(RoomEvent.ConnectionQualityChanged, (quality, participant) => {
+        const id = participant ? participant.identity : 'nil';
+        console.log('Connection quality changed', id, ' -> ', quality);
+      })
+      .on(RoomEvent.SignalConnected, _ => {
+        const signalConnectionTime = Date.now() - startTime;
+        console.log(`signal connection established in ${signalConnectionTime}ms`);
+        // speed up publishing by starting to publish before it's fully connected
+        // publishing is accepted as soon as signal connection has established
+        if (shouldPublish) {
+          room.localParticipant.enableCameraAndMicrophone();
+          console.log(`tracks published in ${Date.now() - startTime}ms`);
+        }
+      });
+
+    const vcEndpoint = this.props.tinode.getServerParam('vcEndpoint', null);
+    room.connect(vcEndpoint, token, connectOpts).then(_ => {
+      console.log('Connected to VC room', room.name, '. Access token', token);
+
+      room.participants.forEach((participant) => {
+        this.handleParticipantConnected2(participant);
+      });
+      this.handleParticipantConnected2(room.localParticipant);
+    });
+
+  }
+
+  start() {
+    if (this.state.localStream) {
+      this.props.onError(this.props.intl.formatMessage(messages.already_in_call), 'info');
+      return;
+    }
+    if (this.isOutgoingCall) {
+      this.props.onCreateCall(this.props.topic, this.props.seq, this.props.callState, this.props.callAudioOnly)
+          .then(ctrl => {
+            const token = ctrl.params.token;
+            const seq = ctrl.params.seq;
+            this.setState({callSeq: seq, token: token});
+            this.startRoom(token);
+          });
+    } else {
+      this.props.onJoin(this.props.topic, this.props.seq);
+    }
+  }
+
+  stop() {
+    if (this.state.room) {
+      this.state.room.disconnect();
+    }
+  }
+
+  reportError(err) {
+    this.props.onError(err.message, 'err');
+  }
+
+  // Call disconnected by remote.
+  handleRemoteHangup() {
+    this.handleCloseClick();
+  }
+
+  handleCloseClick() {
+    this.stop();
+    this.props.onHangup(this.props.topic, this.props.seq);
+  }
+
+  handleToggleCameraClick() {
+    if (!this.state.room) return;
+    const enabled = this.state.room.localParticipant.isCameraEnabled;
+    this.state.room.localParticipant.setCameraEnabled(!enabled)
+      .then(_ => this.forceUpdate());
+    this.forceUpdate();
+  }
+
+  handleToggleMicClick() {
+    if (!this.state.room) return;
+    const enabled = this.state.room.localParticipant.isMicrophoneEnabled;
+    this.state.room.localParticipant.setMicrophoneEnabled(!enabled)
+      .then(_ => this.forceUpdate());
+
+    // Make sure we redraw the mute/unmute icons (e.g. mic -> mic_off).
+    this.forceUpdate();
+  }
+
+  render() {
+    const isPublishing = this.isOutgoingCall || !this.isBroadcast;
+    const disabled = !isPublishing || !this.state.room || !this.state.room.localParticipant;
+    const audioIcon = !disabled && this.state.room.localParticipant.isMicrophoneEnabled ? 'mic' : 'mic_off';
+    const videoIcon = !disabled && this.state.room.localParticipant.isCameraEnabled ? 'videocam' : 'videocam_off';
+
+    const peerTitle = this.state.activeSpeaker ? this.state.activeSpeaker : clipStr(this.props.title, MAX_PEER_TITLE_LENGTH);
+
+    const remoteActive = this.remoteRef.current && (this.remoteRef.current.src != '' || this.remoteRef.current.srcObject)
+
+    return (
+      <>
+        <div id="video-container">
+          { !this.isBroadcast && Object.keys(this.state.participants).length > 0 ?
+            <VCCarousel
+              tinode={this.props.tinode}
+              participants={this.state.participants} /> :
+            null
+          }
+          <div id="video-container-panel">
+            { isPublishing ?
+              <div className="call-party self" disabled={this.state.audioOnly}>
+                <video ref={this.localRef} autoPlay muted playsInline />
+                <div className="caller-name inactive">
+                  <FormattedMessage id="calls_you_label"
+                    defaultMessage="You" description="Shown over the local video screen" />
+                </div>
+              </div> :
+              null }
+            <div className="call-party peer" disabled={!remoteActive}>
+              <video ref={this.remoteRef} autoPlay playsInline />
+              {remoteActive ?
+                <>
+                  <div className="caller-name inactive">{peerTitle}</div>
+                </> :
+                <>
+                  <div className="caller-card">
+                    <div className="avatar-box">
+                      <LetterTile
+                        tinode={this.props.tinode}
+                        avatar={this.props.avatar}
+                        topic={this.props.topic}
+                        title={this.props.title} />
+                    </div>
+                    <div className="caller-name">{peerTitle}</div>
+                  </div>
+                </>
+              }
+            </div>
+          </div>
+          <div className="controls">
+            <button className="danger" onClick={this.handleCloseClick}>
+              <i className="material-icons">call_end</i>
+            </button>
+            <button className="secondary" onClick={this.handleToggleCameraClick} disabled={disabled}>
+              <i className="material-icons">{videoIcon}</i>
+            </button>
+            <button className="secondary" onClick={this.handleToggleMicClick} disabled={disabled}>
+              <i className="material-icons">{audioIcon}</i>
+            </button>
+          </div>
+        </div>
+      </>
+    );
+  }
+};
+
+export default injectIntl(VCPanel);