decode bug fix

houxiao

2017-04-17 bf5edb317dcbf7ba1174968866aa8296637b3a58

 RtspFace/PipeLine.h

@@ -83,6 +83,8 @@
   void push_front_elem(PipeLineElem* elem);
   bool remove_elem(PipeLineElem* elem);
   
   bool check_pipe_complete(PipeLineElem* lastRetElem) const;
	
   // do pipe sync. returns the element who returns false, or the last one.
   // if false return, the element should deal with pm, clean up.
   PipeLineElem* pipe(PipeMaterial* pm = nullptr);