call dispose on pub and track

lib/src/participant/local_participant.dart

@@ -157,7 +157,10 @@ class LocalParticipant extends Participant {
   Future<void> unpublishTrack(String trackSid, {bool notify = true}) async {
     logger.finer('Unpublish track sid: $trackSid, notify: $notify');
     final pub = trackPublications.remove(trackSid);
-    if (pub is! LocalTrackPublication) return;
+    if (pub is! LocalTrackPublication) {
+      await pub?.dispose();
+      return;
+    }
 
     final track = pub.track;
     if (track != null) {
@@ -185,6 +188,8 @@ class LocalParticipant extends Participant {
         publication: pub,
       ));
     }
+
+    await pub.dispose();
   }
 
   /// Publish a new data payload to the room.

lib/src/participant/remote_participant.dart

@@ -158,7 +158,14 @@ class RemoteParticipant extends Participant {
   Future<void> unpublishTrack(String trackSid, {bool notify = true}) async {
     logger.finer('Unpublish track sid: $trackSid, notify: $notify');
     final pub = trackPublications.remove(trackSid);
-    if (pub is! RemoteTrackPublication) return;
+
+    if (pub is! RemoteTrackPublication) {
+      // no publication exists for trackSid 
+      // or publication is not RemoteTrackPublication
+      // logger.warning('pub is not RemoteTrackPublication');
+      await pub?.dispose();
+      return;
+    }
 
     final track = pub.track;
     // if has track
@@ -177,5 +184,7 @@ class RemoteParticipant extends Participant {
         publication: pub,
       ));
     }
+
+    await pub.dispose();
   }
 }

lib/src/track/local_track_publication.dart

@@ -15,6 +15,11 @@ class LocalTrackPublication extends TrackPublication {
     this._participant,
   ) : super.fromInfo(info) {
     this.track = track;
+    // register dispose func
+    onDispose(() async {
+      // this object is responsible for disposing track
+      await track.dispose();
+    });
   }
 
   /// Mute or unmute the current track. When muted, track will stop sending data

lib/src/track/remote_track_publication.dart

@@ -17,6 +17,19 @@ class RemoteTrackPublication extends TrackPublication {
   lk_rtc.VideoQuality _videoQuality = lk_rtc.VideoQuality.HIGH;
   lk_rtc.VideoQuality get videoQuality => _videoQuality;
 
+  RemoteTrackPublication(
+    lk_models.TrackInfo info,
+    this._participant, [
+    Track? track,
+  ]) : super.fromInfo(info) {
+    this.track = track;
+    // register dispose func
+    onDispose(() async {
+      // this object is responsible for disposing track
+      await track?.dispose();
+    });
+  }
+
   set videoQuality(lk_rtc.VideoQuality val) {
     if (val == _videoQuality) return;
     _videoQuality = val;
@@ -76,14 +89,6 @@ class RemoteTrackPublication extends TrackPublication {
     }
   }
 
-  RemoteTrackPublication(
-    lk_models.TrackInfo info,
-    this._participant, [
-    Track? track,
-  ]) : super.fromInfo(info) {
-    this.track = track;
-  }
-
   void _sendUpdateSubscription({required bool subscribed}) {
     logger.fine('Sending update subscription... ${sid} ${subscribed}');
     final subscription = lk_rtc.UpdateSubscription(