Update presence and skip default values (#1536)

* feat: Video type camera is default value of missing, skip it in presence.

We skip sending initial video type camera if it is already missing from presence, if it changes we send the last value.
We also are dropping the namespace as it is not used anywhere and just increases presence size.

* feat: A/V muted is default so we can skip adding it initially to the presence.

Dropping the namespace as it is not used anywhere and that reduces size.

* squash: Drops unused setting.

* squash: Adds a config option to enable skipping the muted state.

JitsiConference.js

         }
     }
     if (newTrack.isVideoTrack()) {
-        this.sendCommand('videoType', {
-            value: newTrack.videoType,
-            attributes: {
-                xmlns: 'http://jitsi.org/jitmeet/video'
-            }
-        });
+        const videoTypeTagName = 'videoType';
+
+        // if video type is camera and there is no videoType in presence, we skip adding it, as this is the default one
+        if (newTrack.videoType !== VideoType.CAMERA || this.room.getFromPresence(videoTypeTagName)) {
+            this.sendCommand(videoTypeTagName, { value: newTrack.videoType });
+        }
     }
     this.rtc.addLocalTrack(newTrack);
 

modules/xmpp/ChatRoom.js

             });
         }
 
-        // We need to broadcast 'videomuted' status from the beginning, cause
-        // Jicofo makes decisions based on that. Initialize it with 'false'
-        // here.
-        this.addVideoInfoToPresence(false);
-
         if (options.deploymentInfo && options.deploymentInfo.userRegion) {
             this.presMap.nodes.push({
                 'tagName': 'region',
      * Adds the key to the presence map, overriding any previous value.
      * @param key The key to add or replace.
      * @param values The new values.
-     * @returns {boolean|null} <tt>true</tt> if the operation succeeded or <tt>false</tt> when no add or replce was
+     * @returns {boolean|null} <tt>true</tt> if the operation succeeded or <tt>false</tt> when no add or replace was
      * performed as the value was already there.
      */
     addOrReplaceInPresence(key, values) {
      * @param mute
      */
     addAudioInfoToPresence(mute) {
+        const audioMutedTagName = 'audiomuted';
+
+        // we skip adding it as muted is default value
+        if (mute && !this.getFromPresence(audioMutedTagName) && this.options.testing.enableSkipDefaultMutedState) {
+            return false;
+        }
+
         return this.addOrReplaceInPresence(
-            'audiomuted',
+            audioMutedTagName,
             {
-                attributes: { 'xmlns': 'http://jitsi.org/jitmeet/audio' },
                 value: mute.toString()
             });
     }
      * @param mute
      */
     addVideoInfoToPresence(mute) {
+        const videoMutedTagName = 'videomuted';
+
+        // we skip adding it as muted is default value
+        if (mute && !this.getFromPresence(videoMutedTagName) && this.options.testing.enableSkipDefaultMutedState) {
+            return false;
+        }
+
         return this.addOrReplaceInPresence(
-            'videomuted',
+            videoMutedTagName,
             {
-                attributes: { 'xmlns': 'http://jitsi.org/jitmeet/video' },
                 value: mute.toString()
             });
     }