tree 9a56395c805937ac64a3592dcda1f51e645965ed
parent 58888d69bab376f7dfac6be2899e688a8990455f
author Tommi <tommi@webrtc.org> 1758361463 +0200
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> 1758443539 -0700

Prevent adding transceivers without a media engine

Add checks to make sure that a media engine is configured when adding
audio and/or video transceivers.

Fix bug for PlanB where PeerConnection would add default audio and video
transceivers even if no media engine was configured. This could lead to
runtime errors later when operations were attempted on these
transceivers. (addressed TODO)

Additionally, add `RTC_DCHECK`s to the RtpTransceiver constructors to
ensure a media engine is always present upon instantiation and
restricting use of the media_engine() accessor to the worker thread.

Bug: none
Change-Id: I28bb7b32831d3ca3bcd0d03db5c9603a94ef4f89
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/410362
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#45702}