fix(screenshare): audio screen share muted state (#8785)

* AudioMixerEffect muted state

* update lib-jitsi-meet

package-lock.json

       }
     },
     "lib-jitsi-meet": {
-      "version": "github:jitsi/lib-jitsi-meet#0ec072378c84206b90f0e001e34cf4d746384cc5",
-      "from": "github:jitsi/lib-jitsi-meet#0ec072378c84206b90f0e001e34cf4d746384cc5",
+      "version": "github:jitsi/lib-jitsi-meet#676c7a910505833810314a665ad1e825a158850c",
+      "from": "github:jitsi/lib-jitsi-meet#676c7a910505833810314a665ad1e825a158850c",
       "requires": {
         "@jitsi/js-utils": "1.0.2",
         "@jitsi/sdp-interop": "1.0.3",

package.json

     "jquery-i18next": "1.2.1",
     "js-md5": "0.6.1",
     "jwt-decode": "2.2.0",
-    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#0ec072378c84206b90f0e001e34cf4d746384cc5",
+    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#676c7a910505833810314a665ad1e825a158850c",
     "libflacjs": "github:mmig/libflac.js#93d37e7f811f01cf7d8b6a603e38bd3c3810907d",
     "lodash": "4.17.21",
     "moment": "2.29.1",

react/features/stream-effects/audio-mixer/AudioMixerEffect.js

      */
     _mixAudio: Object;
 
+    /**
+     * Original MediaStream from the JitsiLocalTrack that uses this effect.
+     */
+    _originalStream: Object;
+
+    /**
+     * MediaStreamTrack obtained from the original MediaStream.
+     */
+    _originalTrack: Object;
+
     /**
      * lib-jitsi-meet AudioMixer.
      */
      * @returns {MediaStream} - MediaStream containing both audio tracks mixed together.
      */
     startEffect(audioStream: MediaStream) {
+        this._originalStream = audioStream;
+        this._originalTrack = audioStream.getTracks()[0];
+
         this._audioMixer = JitsiMeetJS.createAudioMixer();
         this._audioMixer.addMediaStream(this._mixAudio.getOriginalStream());
-        this._audioMixer.addMediaStream(audioStream);
+        this._audioMixer.addMediaStream(this._originalStream);
 
         return this._audioMixer.start();
     }
         this._audioMixer.reset();
     }
 
+    /**
+     * Change the muted state of the effect.
+     *
+     * @param {boolean} muted - Should effect be muted or not.
+     * @returns {void}
+     */
+    setMuted(muted: boolean) {
+        this._originalTrack.enabled = !muted;
+    }
+
+    /**
+     * Check wether or not this effect is muted.
+     *
+     * @returns {boolean}
+     */
+    isMuted() {
+        return !this._originalTrack.enabled;
+    }
 }