Today OnResourceOveruse() and OnResourceUnderuse() implicitly checks
preconditions and if they pass calculate the next target, and if those
are usable it applies them to the VideoSourceRestrictions. These are two
big "MaybeAdapt" methods.
This CL takes us one step closer to "GetNextTarget", "CanApplyTarget?"
and "DoApplyTarget!"-logic, which will allow us to more easily evaluate
a multitude of alternative configurations and decide which one to pick
(e.g. multi-stream adaptation).
But it does not take us all the way there. In this CL we have:
- CanAdaptUp, CanAdaptDown: This covers *most* of the preconditions.
- OnResourceUnderuse, OnResourceOveruse: This aborts if CanAdapt returns
false. If they pass, we calculate the next target and maybe-adapt it.
This is roughly outlined in document still in draft:
https://docs.google.com/document/d/1YMg-AycFZR1DS6hEav9OzJ3hqxFil09qPhlTAgQrU1g/edit?usp=sharing.
A future CL should make the target more explicit and we should know if
the target can be applied before we even try.
Bug: webrtc:11222
Change-Id: If18d9572884aa6ba2350e4670a1516da5835cc98
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168721
Reviewed-by: Evan Shrubsole <eshr@google.com>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30605}
d2a1f09b18