tree f57e46e505ff2acbb7e2803da3f395fbc5472ce0
parent 1f206b841eb98d63a0a9e47b1f76ea59933d25b5
author Philipp Hancke <phancke@microsoft.com> 1675242606 +0100
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> 1675255064 +0000

Only serialize non-stopped RTP header extensions

as described in https://w3c.github.io/webrtc-extensions/#modifications-to-existing-procedures-0
 "For each RTP header extension "e" listed in
 [[HeaderExtensionsToOffer]] where direction is not "stopped", an
 "a=extmap" line, as specified in [RFC5285], section 5

This avoids including them in case they are stopped on one
transceiver but not the other. Also, this allows extensions to
be removed from a subsequent offer.

See also
  https://github.com/w3c/webrtc-extensions/issues/140

BUG=chromium:1051821

Change-Id: I4d7462f939ce4cd5d8c2331bc038200fe18f70e2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291703
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Markus Handell <handellm@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39242}