Prior to this change, in certain circumstances the RTP header length
used when creating a RedPacket was incorrect. This was due to an
assumption that a new media packet would _always_ be added to the
UlpfecGenerator's internal media packet buffer. This is not correct,
and the fix is to keep track of whatever RTP header length that is
currently correct.
Bug: webrtc:8767
Change-Id: I6d61429a19d4693dde9330f0469d13c5dfbeac52
Reviewed-on: https://webrtc-review.googlesource.com/40600
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21720}
393e266470