shithub: libvpx

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Skip intra mode tests depending on inter residuals

This commit allows encoder to skip intra coding mode test, when
the known inter residual is less than the source variance. It
reduces the runtime of speed 3 for test clips:
bus cif 1000 kbps: 8587 ms -> 8260 ms, 3.8% speed-up
pedestrian 1080p 2000 kbps: 161381 ms -> 155241 ms, 3.7% speed-up.

The compression performance is down by
derf   -0.36%
stdhd  -0.25%

Change-Id: I75ce1e035b4da2153cb1ac14111d1a07c05a735d

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -2794,6 +2794,10 @@

     }

     if (ref_frame == INTRA_FRAME) {

+      if (cpi->sf.adaptive_mode_search)

+        if ((x->source_variance << num_pels_log2_lookup[bsize]) > best_intra_rd)

+          continue;

+

       if (!(intra_y_mode_mask & (1 << this_mode)))

         continue;

       if (this_mode != DC_PRED) {

@@ -2966,6 +2970,8 @@

           /* required for left and above block mv */

           mbmi->mv[0].as_int = 0;

           max_plane = 1;

+        } else {

+          best_intra_rd = x->pred_sse[ref_frame];

         }

         *returnrate = rate2;

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

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

@@ -144,6 +144,7 @@

       sf->disable_split_mask = DISABLE_ALL_INTER_SPLIT;

     }

     sf->adaptive_pred_interp_filter = 0;

+    sf->adaptive_mode_search = 1;

     sf->cb_partition_search = !boosted;

     sf->cb_pred_filter_search = 1;

     sf->alt_ref_search_fp = 1;

@@ -386,6 +387,7 @@

   sf->use_lp32x32fdct = 0;

   sf->adaptive_motion_search = 0;

   sf->adaptive_pred_interp_filter = 0;

+  sf->adaptive_mode_search = 0;

   sf->cb_pred_filter_search = 0;

   sf->cb_partition_search = 0;

   sf->motion_field_mode_search = 0;

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

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

@@ -291,6 +291,9 @@

   // was selected, and 2 means we use 8 tap if no 8x8 filter mode was selected.

   int adaptive_pred_interp_filter;

+  // Adaptive prediction mode search

+  int adaptive_mode_search;

+

   // Chessboard pattern prediction filter type search

   int cb_pred_filter_search;