Philipp Hancke 6a3bbefd58 Reland "Enable DD and VLA header extensions by default for Simulcast/SVC"
This is a reland of commit 33c7edd58ad0edc71939b9372fff3ab563c1f4a7
taking into account GFD which can be enabled by field trials and somewhat conflicts with DD

Original change's description:
> Enable DD and VLA header extensions by default for Simulcast/SVC
>
> When Simulcast (more than one encoding) or SVC (a scalability mode
> other than the default L1T1) is used, enable the AV1 Dependency
> Descriptor and the video-layer-allocations RTP header extensions by
> default.
>
> The RTP header extensions API can be used to disable them if needed.
>
> BUG=webrtc:15378
>
> Change-Id: I587ac32c9d681461496a136f6950b007e72da86d
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/326100
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> Commit-Queue: Philipp Hancke <phancke@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#41332}

Bug: webrtc:15378
Change-Id: I190edc9435083c0a0a65a6959363f3c41e4a3d1b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/330563
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41615}
2024-01-26 06:08:28 +00:00
..