tree 231cf2eab0a0435172a2c2b24137d102c70afa0c
parent ec6eded41c203e45fc9bf156f72b88f620e5fa1b
author Urvang Joshi <urvang@google.com> 1550260959 -0800
committer Urvang Joshi <urvang@google.com> 1550707730 +0000

Refactor reference frame mask.

Earlier, the mask had a few drawbacks:

(i) It only supported disabling a particular reference
entirely (when it is not available, for example).
But it did NOT support allowing/disallowing specific single/compound
reference combinations.

(ii) The mask also had a weird implementation/meaning: to disable a reference
frame, the bit was turned on in mask1, and *all* bits were turned on for
mask2.

Instead, we now use a 2D array that specifies if reference combination
(i,j) is allowed or not. This overcomes both drawbacks above.

No change in stats/output.

Change-Id: Icfa40f24cd6a48775ec0ddfa340019607d0c941c