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Wrap-arounds in sequence numbers (and in timestamps) were not always treated correctly. This is fixed by introducing two helper functions for correct comparisons, and by casting to the right word size. Also added a new member variable to AutomodeInst_t. The new member keeps track of when the first packet has been registered in the automode code. This was previously done implicitly (and not very good) using the fact that the lastSeqNo and lastTimestamp members were initialized to zero. Two new unit tests were added as part of this CL. NetEqDecodingTest.SequenceNumberWrap was failing before the fixes were made; now it is ok. BUG=2654 R=tina.legrand@webrtc.org Review URL: https://webrtc-codereview.appspot.com/4139004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5150 4adac7df-926f-26a2-2b94-8c16560cd09d