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vp9-rtc: Speed feature for filter_search in nonrd_pickmode.

Use chessboard search only for certain speeds/resolns
(speed >= 8) for real-time speed features.

Disable chessboard search for speeds <= 7.
~2.5 gain on rtc set for speed 7.
~1% slowdown.

Change-Id: Ic6898aa475817e128154f691413c73f65306e2a8

--- a/vp9/encoder/vp9_pickmode.c

+++ b/vp9/encoder/vp9_pickmode.c

@@ -1643,13 +1643,7 @@

   const int denoise_recheck_zeromv = 0;

 #endif

   INTERP_FILTER filter_ref;

-  const int bsl = mi_width_log2_lookup[bsize];

-  const int pred_filter_search =

-      cm->interp_filter == SWITCHABLE

-          ? (((mi_row + mi_col) >> bsl) +

-             get_chessboard_index(cm->current_video_frame)) &

-                0x1

-          : 0;

+  int pred_filter_search = cm->interp_filter == SWITCHABLE;

   int const_motion[MAX_REF_FRAMES] = { 0 };

   const int bh = num_4x4_blocks_high_lookup[bsize] << 2;

   const int bw = num_4x4_blocks_wide_lookup[bsize] << 2;

@@ -1780,6 +1774,14 @@

   x->skip_encode = cpi->sf.skip_encode_frame && x->q_index < QIDX_SKIP_THRESH;

   x->skip = 0;

+  if (cpi->sf.cb_pred_filter_search) {

+    const int bsl = mi_width_log2_lookup[bsize];

+    pred_filter_search = cm->interp_filter == SWITCHABLE

+                             ? (((mi_row + mi_col) >> bsl) +

+                                get_chessboard_index(cm->current_video_frame)) &

+                                   0x1

+                             : 0;

+  }

   // Instead of using vp9_get_pred_context_switchable_interp(xd) to assign

   // filter_ref, we use a less strict condition on assigning filter_ref.

   // This is to reduce the probabily of entering the flow of not assigning

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

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

@@ -452,6 +452,7 @@

   sf->use_accurate_subpel_search = USE_2_TAPS;

   sf->nonrd_use_ml_partition = 0;

   sf->variance_part_thresh_mult = 1;

+  sf->cb_pred_filter_search = 0;

   if (speed >= 1) {

     sf->allow_txfm_domain_distortion = 1;

@@ -749,9 +750,11 @@

     }

     sf->limit_newmv_early_exit = 0;

     sf->use_simple_block_yrd = 1;

+    if (cm->width * cm->height > 352 * 288) sf->cb_pred_filter_search = 1;

   }

   if (speed >= 9) {

+    sf->cb_pred_filter_search = 1;

     sf->mv.enable_adaptive_subpel_force_stop = 1;

     sf->mv.adapt_subpel_force_stop.mv_thresh = 1;

     sf->mv.adapt_subpel_force_stop.force_stop_below = QUARTER_PEL;