Cache target bit- and framerate in a frame_num -> rates map and fetch
the rates accociated with the current frame when needed. This solves
the issue when wrong target rates may be used due to frames buffering
in encoder.
Bug: b/254447893
Change-Id: I369c8d8e71234c957dc2362b055061d12cec818f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/283841
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38673}
7404f07ad9