code: public void stop() {
          if (started) {
              stopped();
          }
          started = false;
          if (worker != null) {
              worker.cancel();
          }
          
          if(mediaSink!=null) {
          	mediaSink.stop();
          }
          	
          timestamp = 0;
      }
docs: (Non Java-doc).
  
  @see org.mobicents.media.MediaSource#stop().