commit 6b0be133651655e60ab6b9cfee02e6a4fa6d46c4
author Mudassir Galagnath <mudassir.galaganath@ittiam.com> Wed May 19 12:55:28 2021 +0530
committer Mudassir Galagnath <mudassir.galaganath@ittiam.com> Mon May 24 13:09:05 2021 +0530
tree bf057149fd8755dff27ebf1fd10462316d0ffef3
parent 87682566cba91bf391c2aeb8a827252b7f1c7162

Reduce entropy cost update frequency for mode

A speed feature option is introduced to reduce entropy cost update
frequency for mode. This change is applicable for speed preset 6.

          Instruction Count          BD-Rate Loss(%)
cpu-used    Reduction(%)    avg.psnr  ovr.psnr  ssim
   6          0.474         0.0599    0.0567    0.0601

STATS_CHANGED

Change-Id: Ib12b7198445467ec99b4a3624d31a0a73b8b77cc

av1/encoder/encodeframe_utils.c

diff --git a/av1/encoder/encodeframe_utils.c b/av1/encoder/encodeframe_utils.c
index 557585a..edbba09 100644
--- a/av1/encoder/encodeframe_utils.c
+++ b/av1/encoder/encodeframe_utils.c
@@ -1388,6 +1388,9 @@
       if (mi_col != tile_info->mi_col_start) break;
       AOM_FALLTHROUGH_INTENDED;
     case COST_UPD_SB:  // SB level
+      if (cpi->sf.inter_sf.mode_cost_upd_level == INTERNAL_COST_UPD_SBROW &&
+          mi_col != tile_info->mi_col_start)
+        break;
       av1_fill_mode_rates(cm, &x->mode_costs, xd->tile_ctx);
       break;
     default: assert(0);

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index 66f2792..44a3fde 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -708,6 +708,7 @@
     if (!is_720p_or_larger) {
       sf->inter_sf.mv_cost_upd_level = INTERNAL_COST_UPD_SBROW_SET;
       sf->inter_sf.coeff_cost_upd_level = INTERNAL_COST_UPD_SBROW;
+      sf->inter_sf.mode_cost_upd_level = INTERNAL_COST_UPD_SBROW;
     }
 
     if (is_720p_or_larger) {
@@ -1591,6 +1592,7 @@
   inter_sf->reuse_inter_intra_mode = 0;
   inter_sf->mv_cost_upd_level = INTERNAL_COST_UPD_SB;
   inter_sf->coeff_cost_upd_level = INTERNAL_COST_UPD_SB;
+  inter_sf->mode_cost_upd_level = INTERNAL_COST_UPD_SB;
   inter_sf->prune_inter_modes_based_on_tpl = 0;
   inter_sf->prune_nearmv_using_neighbors = 0;
   inter_sf->prune_comp_search_by_single_result = 0;

av1/encoder/speed_features.h

diff --git a/av1/encoder/speed_features.h b/av1/encoder/speed_features.h
index cb947fb..89138c2 100644
--- a/av1/encoder/speed_features.h
+++ b/av1/encoder/speed_features.h
@@ -774,6 +774,9 @@
   // Clip the frequency of updating the coeff cost.
   INTERNAL_COST_UPDATE_TYPE coeff_cost_upd_level;
 
+  // Clip the frequency of updating the mode cost.
+  INTERNAL_COST_UPDATE_TYPE mode_cost_upd_level;
+
   // Prune inter modes based on tpl stats
   // 0 : no pruning
   // 1 - 3 indicate increasing aggressiveness in order.