server: stop sending frames immediately after ServerStream.Close() is called

serverstream.go

@@ -67,6 +67,10 @@ func (st *ServerStream) Close() error {
 		}
 	}
 
+	for ss := range st.readers {
+		ss.Close()
+	}
+
 	if st.multicastListeners != nil {
 		for _, l := range st.multicastListeners {
 			l.rtpListener.close()
@@ -75,10 +79,8 @@ func (st *ServerStream) Close() error {
 		st.multicastListeners = nil
 	}
 
-	for ss := range st.readers {
-		ss.Close()
-	}
 	st.readers = nil
+	st.readersUnicast = nil
 
 	return nil
 }
@@ -123,10 +125,7 @@ func (st *ServerStream) readerAdd(ss *ServerSession, isMulticast bool) error {
 		}
 	}
 
-	if !isMulticast || st.multicastListeners != nil {
-		return nil
-	}
-
+	if isMulticast && st.multicastListeners == nil {
 		st.multicastListeners = make([]*listenerPair, len(st.tracks))
 
 		for i := range st.tracks {
@@ -147,6 +146,7 @@ func (st *ServerStream) readerAdd(ss *ServerSession, isMulticast bool) error {
 				rtcpListener: rtcpListener,
 			}
 		}
+	}
 
 	return nil
 }