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Elevate NEWMV mode checking threshold in real time

The current threshold is knid of low, and in many cases NEWMV
mode is checked but not picked as the best mode. This patch
added a speed feature to increase NEWMV threshold, so that
less partition mode checking goes to check NEWMV. This feature
is enabled for speed 6 and 7.

Rtc set borg tests showed:
1. Speed 6, overall psnr: -0.088%, ssim: -1.339%;
   Average speedup on rtc set is 11.1%.
2. Speed 7, overall psnr: -0.505%, ssim: -2.320%
   Average speedup on rtc set is 12.9%.

Change-Id: I953b849eeb6e0d5a1f13eacba30c14204472c5be

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

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

@@ -4273,6 +4273,7 @@

 void vp9_set_rd_speed_thresholds(VP9_COMP *cpi) {

   int i;

   RD_OPT *const rd = &cpi->rd;

+  SPEED_FEATURES *const sf = &cpi->sf;

   // Set baseline threshold values

   for (i = 0; i < MAX_MODES; ++i)

@@ -4350,6 +4351,10 @@

     rd->thresh_mult[THR_COMP_NEARGA   ] = INT_MAX;

     rd->thresh_mult[THR_COMP_NEWGA    ] = INT_MAX;

   }

+

+  // Adjust threshold only in real time mode, which only use last reference

+  // frame.

+  rd->thresh_mult[THR_NEWMV] += sf->elevate_newmv_thresh;

 }

 void vp9_set_rd_speed_thresholds_sub8x8(VP9_COMP *cpi) {

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

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

@@ -277,11 +277,15 @@

     // This feature is only enabled when partition search is disabled.

     sf->reuse_inter_pred_sby = 1;

+

+    // Increase mode checking threshold for NEWMV.

+    sf->elevate_newmv_thresh = 2000;

   }

   if (speed >= 7) {

     sf->lpf_pick = LPF_PICK_MINIMAL_LPF;

     sf->encode_breakout_thresh = (MIN(cm->width, cm->height) >= 720) ?

         800 : 300;

+    sf->elevate_newmv_thresh = 2500;

   }

   if (speed >= 8) {

     int i;

@@ -352,6 +356,7 @@

   sf->always_this_block_size = BLOCK_16X16;

   sf->search_type_check_frequency = 50;

   sf->encode_breakout_thresh = 0;

+  sf->elevate_newmv_thresh = 0;

   // Recode loop tolerence %.

   sf->recode_tolerance = 25;

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

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

@@ -361,6 +361,9 @@

   // This variable sets the encode_breakout threshold. Currently, it is only

   // enabled in real time mode.

   int encode_breakout_thresh;

+

+  // In real time encoding, increase the threshold for NEWMV.

+  int elevate_newmv_thresh;

 } SPEED_FEATURES;

 struct VP9_COMP;