Added two stream descriptors that are both used to tell the output format. If it is not given, the packager will use the output file extension to determine the output format. Change-Id: Ib8d5dcf52956c2d451e77ea6a90d9502d4a77064
Change-Id: Ic69169c31d0a54de4895d49ff8b4a758039733a7
Make it easier to be included and integrated into other code. Change-Id: I609881688cc20f8fac676cbd91fde4753af32ee5