pub fn get_stream_by_id(&self, id: u32) -> Option<Rc<NAStream>> {
for i in 0..self.streams.len() {
if self.streams[i].get_id() == id {
pub fn get_stream_by_id(&self, id: u32) -> Option<Rc<NAStream>> {
for i in 0..self.streams.len() {
if self.streams[i].get_id() == id {