Move that calculation into dedicated function, move comment why it is calculated the way it is into the same function.
Cleanup that comment - remove parts unused by current code, in particular remove description of code that was deleted a while ago
Use more strict types for the calculation to make it clearer.
Replace DCHECK result can't be zero with a clamp to ensure it can't be zero, because with large bitrates it may.
Reland of https://webrtc-review.googlesource.com/c/src/+/315143
Bug: None
Change-Id: I41ce383a2f19d489e4cae0b1bf1f720e0ffdd17a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/315460
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40538}
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