tree a82160c22535648dbaa5acea8f45438906058c50
parent 452d6da16389fc57e547384598f7e6f8dd216208
author chiyotsai <chiyotsai@google.com> 1661454726 -0700
committer Chi Yo Tsai <chiyotsai@google.com> 1661534154 +0000

RTC: Adaptively downgrade subpixel search

This commit adds the use_adaptive_subpel_search speed feature, which
downgrades the subpel search to av1_find_best_sub_pixel_tree_pruned_more
when either x->content_state_sb.source_sad_nonrd <= kLowSad, or the
corresponding fullpel search returns low residue variance.

For reference, if the encoder always uses
av1_find_best_sub_pixel_tree_pruned_more, there is about 1.97% encoding
time reduction @ 0.366% BDRate loss.

| SPD_SET | TESTSET  | AVG_PSNR | OVR_PSNR |  SSIM   | ENC_T |
|---------|----------|----------|----------|---------|-------|
|    7    |   rtc    | +0.015%  | +0.039%  | +0.085% | -1.2% |
|    7    | rtc_derf | +0.018%  | +0.051%  | -0.008% | -1.1% |
|---------|----------|----------|----------|---------|-------|
|    8    |   rtc    | -0.027%  | -0.051%  | -0.073% | -1.3% |
|    8    | rtc_derf | -0.286%  | -0.293%  | -0.310% | -1.1% |

STATS_CHANGED

Change-Id: I623f138694c1e85b1ac8112027d6adbaec6517d7