shithub: libvpx

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Adjust full-pixel search method in real-time mode

Use FAST_HEX in speed 5 and 6, which covers more points than
FAST_DIAMOND and improves motion search quality.

At speed 6, RTC set borg tests showed slight quality gain (psnr
gain: 0.143%, ssim gain: 0.226%). No noticeable encoding speed
change.

Change-Id: Ifa62875d9a52ee382ec494f271382bb77d8c67bf

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

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

@@ -266,7 +266,6 @@

     sf->max_delta_qindex = (cm->frame_type == KEY_FRAME) ? 20 : 15;

     sf->partition_search_type = REFERENCE_PARTITION;

     sf->use_nonrd_pick_mode = 1;

-    sf->mv.search_method = FAST_DIAMOND;

     sf->allow_skip_recode = 0;

   }

@@ -288,6 +287,7 @@

     sf->mv.reduce_first_step_size = 1;

   }

   if (speed >= 7) {

+    sf->mv.search_method = FAST_DIAMOND;

     sf->mv.fullpel_search_step_param = 10;

     sf->lpf_pick = LPF_PICK_MINIMAL_LPF;

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