commit 4e193e4f76ae30a160d8268f3a7c4ccb20e6afaa
author Erik Språng <sprang@webrtc.org> Fri Sep 14 17:01:58 2018
committer Commit Bot <commit-bot@chromium.org> Mon Sep 17 10:01:27 2018
tree 0a3b35d81e2a636dd9bf953f6f19d7cd4d2bc6fb
parent 9888f65a461488588b08a78516333d6577e0b816

Add ability to throttle VideoBitrateAllocation updates.

When the bandwidth estimate is volatile, and the frame rate is high,
each new frame might trigger a new video bitrate allocation that is very
close to the previous one, during BWE rampup.
This might cause unnecessarily high RTCP traffic.

This CL throttles those updates, if the allocation fullfills all of:
* Larger or the same total bitrate as the previously sent one
* Less than 10% larger bitrate compared to the previous one
* Same layers enables as the previous one
* Less than 500ms has passed since the previous one

Additionally, a call to OnEncodedImage can cause a throttled allocation
to be sent if 500ms has passed but no new call to OnBitrateUpdated has
been seen.

Bug: webrtc:9734
Change-Id: I2a17c2e512387e273e9c22bffcebd290727dc883
Reviewed-on: https://webrtc-review.googlesource.com/100560
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24751}