fix(gateway): bound fake media shutdown

gateway/provider.go

@@ -443,20 +443,42 @@ func (s *fakeSession) EmitEvent(event ProviderEvent) {
 }
 
 func (s *fakeSession) EmitVideo(payload []byte) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.state.State == ProviderStateTerminating || s.state.State == ProviderStateTerminated || s.state.State == ProviderStateDisconnected {
+		return
+	}
 	select {
 	case s.video <- append([]byte(nil), payload...):
 	default:
-		<-s.video
-		s.video <- append([]byte(nil), payload...)
+		select {
+		case <-s.video:
+		default:
+		}
+		select {
+		case s.video <- append([]byte(nil), payload...):
+		default:
+		}
 	}
 }
 
 func (s *fakeSession) EmitAudio(payload []byte) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.state.State == ProviderStateTerminating || s.state.State == ProviderStateTerminated || s.state.State == ProviderStateDisconnected {
+		return
+	}
 	select {
 	case s.audio <- append([]byte(nil), payload...):
 	default:
-		<-s.audio
-		s.audio <- append([]byte(nil), payload...)
+		select {
+		case <-s.audio:
+		default:
+		}
+		select {
+		case s.audio <- append([]byte(nil), payload...):
+		default:
+		}
 	}
 }
 
@@ -542,12 +564,10 @@ func (s *fakeSession) Terminate(ctx context.Context) error {
 		return nil
 	}
 	s.state.State = ProviderStateTerminating
-	s.mu.Unlock()
 	s.closeOnce.Do(func() {
 		close(s.video)
 		close(s.audio)
 	})
-	s.mu.Lock()
 	s.state.State = ProviderStateTerminated
 	s.mu.Unlock()
 	return nil