fix: stop audio track on mute. (#207)

* fix: stop audio track on mute.

* chore: Let audioBitrate preset to music.

* update.

* update depends.

* update.

lib/src/participant/local.dart

@@ -25,6 +25,7 @@ import 'participant.dart';
 /// Represents the current participant in the room. Instance of [LocalParticipant] is automatically
 /// created after successfully connecting to a [Room] and will be accessible from [Room.localParticipant].
 class LocalParticipant extends Participant<LocalTrackPublication> {
+  bool stopMicTrackOnMute = false;
   @internal
   LocalParticipant({
     required Room room,
@@ -53,6 +54,8 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
     publishOptions =
         publishOptions ?? room.roomOptions.defaultAudioPublishOptions;
 
+    stopMicTrackOnMute = publishOptions.stopMicTrackOnMute;
+
     final trackInfo = await room.engine.addTrack(
       cid: track.getCid(),
       name: track.name,
@@ -310,13 +313,24 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
     logger.fine('setSourceEnabled(source: $source, enabled: $enabled)');
     final publication = getTrackPublicationBySource(source);
     if (publication != null) {
+      var track = publication.track;
+      var stopOnMute = stopMicTrackOnMute && track is LocalAudioTrack;
       if (enabled) {
         await publication.unmute();
+        if (stopOnMute) {
+          await track.restartTrack();
+          await track.onTrackStarted();
+        }
       } else {
         if (source == TrackSource.screenShareVideo) {
           await unpublishTrack(publication.sid);
         } else {
           await publication.mute();
+          if (stopOnMute) {
+            await track.sender?.setTrack(null);
+            await track.stop();
+            await track.onTrackStopped();
+          }
         }
       }
       return publication;