Change temporal filter's search_method on speed 1

This commit introduces a new speed feature that determines the
SEARCH_METHOD used by temporal filter when doing 16x16 block on
full_pixel_motion_search. On speed 0, the most exhaustive method MESH is
used. On speed 1 and above, a faster method NSTEP is used.

Performance:
        | AVG_PSNR | AVG_SPDUP | AVG_SPDUP:AVG_PSNR
 MISRES |  0.007%  |   2.818%  |        402:1
  HDRES |  0.004%  |   4.897%  |       1224:1

In the case of midres, there is a small quality gain of -0.021% on
OVR_PSNR.

Performance measurement is done on speed 1 with auto_alt_ref=1.
Quality is measured on full midres set over 60 frames. Speed is measured
on 5 midres clips over 4 bitrates over 30 frames.

STATS_CHANGED

Change-Id: Ic1879d2237f8734529e194767a6cf5e43e20b47b

1 files changed, 2 insertions, 0 deletions

diff --git a/vp9/encoder/vp9_speed_features.c b/vp9/encoder/vp9_speed_features.c
index 5aede927b..50e25c35c 100644
--- a/vp9/encoder/vp9_speed_features.c
+++ b/vp9/encoder/vp9_speed_features.c
@@ -237,6 +237,7 @@ static void set_good_speed_feature_framesize_independent(VP9_COMP *cpi,
   }
 
   if (speed >= 1) {
+    sf->temporal_filter_search_method = NSTEP;
     sf->ml_var_partition_pruning = !boosted;
     sf->ml_prune_rect_partition_threhold[1] = 200;
     sf->ml_prune_rect_partition_threhold[2] = 200;
@@ -906,6 +907,7 @@ void vp9_set_speed_features_framesize_independent(VP9_COMP *cpi) {
   sf->allow_acl = 1;
   sf->enable_tpl_model = oxcf->enable_tpl_model;
   sf->prune_ref_frame_for_rect_partitions = 0;
+  sf->temporal_filter_search_method = MESH;
 
   for (i = 0; i < TX_SIZES; i++) {
     sf->intra_y_mode_mask[i] = INTRA_ALL;