tree ea6cc08a13b6bacf9b0a2ed4f27f4c83c5b1b612
parent 510d8f65c24fe063f6b32791a9bfe76d2b1b57c2
author Jingning Han <jingning@google.com> 1562174643 -0700
committer Jingning Han <jingning@google.com> 1562692243 +0000

Rework frame context selection

Make the primary reference frame selection dependent on the GOP
layer depth. Remove the dependency on frame update types.

It changes the coding stats. Tested in speed 0 and 1, the compression
performance is improved by 0.05% - 0.09% across different test sets.

STATS_CHANGED

Change-Id: I1ab3dc51afc6902809a4aab2f151eefe8b040f03