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ref: b402a6ab49b5b8ccd88559cf8013fa641a6d30f9 parent: da4dd40eaeebf8065499fff268e700d103384d10 author: huade <huashi@cisco.com> date: Tue Dec 20 03:01:48 EST 2016
Multi-thread-fixed:RBC#1691:refactoring for WelsGetNumMbInSlice