code: public IPlaylistSubscriberStream newPlaylistSubscriberStream(Number streamId) {
          if (isValidStreamId(streamId)) {
              // get PlaylistSubscriberStream defined as a prototype in red5-common.xml
              PlaylistSubscriberStream pss = (PlaylistSubscriberStream) scope.getContext().getBean("playlistSubscriberStream");
              customizeStream(streamId, pss);
              if (!registerStream(pss)) {
                  log.trace("Stream: {} for stream id: {} failed to register", streamId);
                  pss = null;
              }
              return pss;
          }
          return null;
      }
docs: {@inheritDoc}