Header metadata such as audio level and capture time doesn't make sense
for redundant payloads (i.e. RED and inband-FEC).
It is assumed that one of the parsed payload timestamps will correspond
to the RTP header timestamp.
This fixes a bug where capture time and CSRCs were not set after
parsing RED packets.
CreateRedPayload test function is adapted from red_payload_splitter_unittest.cc
Bug: webrtc:15185
Change-Id: Iba58772499b6d760f516854999b60511896b053c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/305700
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Commit-Queue: Jakob Ivarsson <jakobi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40240}
89f64b994f