shithub: libvpx

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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

--- a/vp9/encoder/vp9_speed_features.c

+++ b/vp9/encoder/vp9_speed_features.c

@@ -237,6 +237,7 @@

   }

   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 @@

   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;

--- a/vp9/encoder/vp9_speed_features.h

+++ b/vp9/encoder/vp9_speed_features.h

@@ -595,6 +595,9 @@

   // Allow sub-pixel search to use interpolation filters with different taps in

   // order to achieve accurate motion search result.

   SUBPEL_SEARCH_TYPE use_accurate_subpel_search;

+

+  // Search method used by temporal filtering in full_pixel_motion_search.

+  SEARCH_METHODS temporal_filter_search_method;

 } SPEED_FEATURES;

 struct VP9_COMP;

--- a/vp9/encoder/vp9_temporal_filter.c

+++ b/vp9/encoder/vp9_temporal_filter.c

@@ -501,6 +501,7 @@

   MACROBLOCKD *const xd = &x->e_mbd;

   MV_SPEED_FEATURES *const mv_sf = &cpi->sf.mv;

   const SEARCH_METHODS search_method = MESH;

+  const SEARCH_METHODS search_method_16 = cpi->sf.temporal_filter_search_method;

   int step_param;

   int sadpb = x->sadperbit16;

   uint32_t bestsme = UINT_MAX;

@@ -563,7 +564,7 @@

       vp9_set_mv_search_range(&x->mv_limits, &best_ref_mv1);

       vp9_full_pixel_search(cpi, x, TF_SUB_BLOCK, &best_ref_mv1_full,

-                            step_param, search_method, sadpb,

+                            step_param, search_method_16, sadpb,

                             cond_cost_list(cpi, cost_list), &best_ref_mv1,

                             &blk_mvs[k], 0, 0);

       /* restore UMV window */