Tested with audioproc_unittest, trybots and verified bit exactness on recording data base. TEST=none BUG=none Review URL: https://webrtc-codereview.appspot.com/1110006 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3547 4adac7df-926f-26a2-2b94-8c16560cd09d