commit 6092a6cd8661aa1b0fbe2258f5bb8a56c13a26fd
author Remya <remya.prakasan@ittiam.com> Tue Oct 01 17:51:01 2019 +0530
committer Yunqing Wang <yunqingwang@google.com> Wed Oct 02 00:17:34 2019 +0000
tree 67e59af8564b125e2484a1567d39d5ba45dcf9ce
parent 016454deb91c7c767a157939d212bbfe21521264

Add speed feature prune_ref_frame_for_gm_search

Introduce a speed feature for cpu-used >= 2, to prune
reference frames during global motion estimation.
This speed feature will prune ref frames in a direction (past/future)
if the farthest ref_frame in that direction yields gm_type as
INVALID/TRANSLATION/IDENTITY.

            Instruction Count
cpu-used       Reduction        Quality Loss
   2               6%             0.01%

STATS_CHANGED

Change-Id: I0927cee46d075f8bb661f67b28aa24dcdde66874

av1/encoder/encodeframe.c

diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index 120d7d2..ad1604d 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -5157,6 +5157,12 @@
       compute_gm_for_valid_ref_frames(
           cpi, ref_buf, frame, &num_frm_corners, frm_corners, frm_buffer,
           params_by_motion, segment_map, segment_map_w, segment_map_h);
+      // If farthest ref frame yields INVALID/TRANSLATION/IDENTITY  global
+      // motion, skip evaluation of global motion w.r.t to other ref frames in
+      // that direction
+      if (cpi->sf.prune_ref_frame_for_gm_search && past_frame == 0 &&
+          cm->global_motion[frame].wmtype != ROTZOOM)
+        break;
     }
 
     // Compute global motion w.r.t. future reference frames
@@ -5166,6 +5172,12 @@
       compute_gm_for_valid_ref_frames(
           cpi, ref_buf, frame, &num_frm_corners, frm_corners, frm_buffer,
           params_by_motion, segment_map, segment_map_w, segment_map_h);
+      // If farthest ref frame yields INVALID/TRANSLATION/IDENTITY  global
+      // motion, skip evaluation of global motion w.r.t to other ref frames in
+      // that direction
+      if (cpi->sf.prune_ref_frame_for_gm_search && future_frame == 0 &&
+          cm->global_motion[frame].wmtype != ROTZOOM)
+        break;
     }
     aom_free(segment_map);
 

av1/encoder/speed_features.c

diff --git a/av1/encoder/speed_features.c b/av1/encoder/speed_features.c
index b455abb..d0c8bf9 100644
--- a/av1/encoder/speed_features.c
+++ b/av1/encoder/speed_features.c
@@ -332,6 +332,7 @@
 
   if (speed >= 2) {
     sf->gm_erroradv_type = GM_ERRORADV_TR_2;
+    sf->prune_ref_frame_for_gm_search = 1;
 
     sf->selective_ref_frame = 3;
 
@@ -853,6 +854,7 @@
   sf->tx_domain_dist_thres_level = 0;
   sf->gm_search_type = GM_FULL_SEARCH;
   sf->gm_disable_recode = 0;
+  sf->prune_ref_frame_for_gm_search = 0;
   sf->use_fast_interpolation_filter_search = 0;
   sf->disable_dual_filter = 0;
   sf->skip_repeat_interpolation_filter_search = 0;

av1/encoder/speed_features.h

diff --git a/av1/encoder/speed_features.h b/av1/encoder/speed_features.h
index 49cbf0f..643f33a 100644
--- a/av1/encoder/speed_features.h
+++ b/av1/encoder/speed_features.h
@@ -512,6 +512,11 @@
   // whether to disable the global motion recode loop
   int gm_disable_recode;
 
+  // prune reference frames during global motion estimation, if the farthest
+  // ref_frame in either direction (past/future) yields gm_type as
+  // INVALID/TRANSLATION/IDENTITY
+  int prune_ref_frame_for_gm_search;
+
   // Do limited interpolation filter search for dual filters, since best choice
   // usually includes EIGHTTAP_REGULAR.
   int use_fast_interpolation_filter_search;