tree d92beb5193e66da26e327bf99ec7a28f37903145
parent acc2adf9195ff4c5d061132d860d2fe38b28aa55
author Hui Su <huisu@google.com> 1583856451 -0700
committer Hui Su <huisu@google.com> 1583967847 +0000

Move some ref frame pruning logic to frame level

Create a frame level mask to mark which ref frames should be skipped
for encoding current frame during RDO. Before this patch, the pruning
decisions were made on block level repeatedly. A small instruction count
redcution is achieved.

Change-Id: Id2ecf54cc33c9f8a85f55e1f02a37d11c5187e3e