protocol 3: remote mute/unmute

resolves LK-94

@@ -372,6 +372,7 @@ internal constructor(
         fun onAddTrack(track: MediaStreamTrack, streams: Array<out MediaStream>)
         fun onUpdateParticipants(updates: List<LivekitModels.ParticipantInfo>)
         fun onActiveSpeakersUpdate(speakers: List<LivekitModels.SpeakerInfo>)
+        fun onRemoteMuteChanged(trackSid: String, muted: Boolean)
         fun onSpeakersChanged(speakers: List<LivekitModels.SpeakerInfo>)
         fun onDisconnect(reason: String)
         fun onFailToConnect(error: Exception)
@@ -492,6 +493,10 @@ internal constructor(
         listener?.onDisconnect(reason)
     }
 
+    override fun onRemoteMuteChanged(trackSid: String, muted: Boolean) {
+        listener?.onRemoteMuteChanged(trackSid, muted)
+    }
+
     override fun onLeave() {
         close()
         listener?.onDisconnect("")

@@ -314,6 +314,10 @@ constructor(
         handleActiveSpeakersUpdate(speakers)
     }
 
+    override fun onRemoteMuteChanged(trackSid: String, muted: Boolean) {
+        localParticipant.onRemoteMuteChanged(trackSid, muted)
+    }
+
     /**
      * @suppress
      */

@@ -369,7 +369,7 @@ constructor(
                 listener?.onLeave()
             }
             LivekitRtc.SignalResponse.MessageCase.MUTE -> {
-                //TODO
+                listener?.onRemoteMuteChanged(response.mute.sid, response.mute.muted)
             }
             LivekitRtc.SignalResponse.MessageCase.ROOM_UPDATE -> {
                 //TODO
@@ -394,6 +394,7 @@ constructor(
         fun onParticipantUpdate(updates: List<LivekitModels.ParticipantInfo>)
         fun onSpeakersChanged(speakers: List<LivekitModels.SpeakerInfo>)
         fun onClose(reason: String, code: Int)
+        fun onRemoteMuteChanged(trackSid: String, muted: Boolean)
         fun onLeave()
         fun onError(error: Exception)
     }

@@ -188,6 +188,11 @@ internal constructor(
         }
     }
 
+    fun onRemoteMuteChanged(trackSid: String, muted: Boolean) {
+        val pub = tracks[trackSid]
+        pub?.muted = muted
+    }
+
     interface PublishListener {
         fun onPublishSuccess(publication: TrackPublication) {}
         fun onPublishFailure(exception: Exception) {}