tree 37f5afd2bc04e8188b227fd464b96ceac6344c38
parent 11895fd49957d235ba782b34ea44f63b5e26a059
author Marco Paniconi <marpan@google.com> 1677384569 -0800
committer Marco Paniconi <marpan@google.com> 1677696718 +0000

rtc: Color sensitivity for altref in nonrd

Add superblock-level color sensitivity flag for altref,
similar to golden, and use this in the nonrd pickmode.
If this color flag is set for altref: skip altref as
single reference mode (in get_ref_frame_use_mask(), as
is done for golden), and skip the compound mode (and add
the same there condition for golden reference).

Skip logic is targeted to small source variance (flat areas)
in y channel, as that is where the wrong color artifact
likely occurs.

This reduces the occurrence of wrong color blocks, observed
in the issue below. Though the issue/artifact can still arise,
this change is fairly conservative to avoid regression on
the test sets.

Stats changed: avg/ovr/ssim, IC (speedup)
rtc_derf:
speed 7:  0.176/0.119/0.279,   0.263
speed 8: -0.029/-0.027/0.038, -0.042
speed 9:  0.159/0.134/0.198,   0.088
speed 10: 0.01/-0.001/0.011,  -0.062

rtc:
speed 8:  0.427/0.389/0.684,  0.318
speed 9:  0.154/0.137/0.521, -0.178
speed 10: 0.358/0.327/0.720, -0.426

rtc_screen:
speed 10: -0.045/-0.025/-0.095, -0.1

Bug: aomedia:3370
Change-Id: Iaeb989ba83b876560a03dd7c74be4eeae1340856