shithub: libvpx

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vp9-svc: Adjust search step param for spatial layers

For non-base spatial layer in screen-content mode:
use nstep but with larger step_param value than sl0,
to avoid increase in encode_time.
Some improvement on scrolling slides content.

Change-Id: Ica918ac01664431d1fabb3c674d857cf6ad87414

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

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

@@ -799,7 +799,9 @@

       svc->spatial_layer_id == 0 &&

       (svc->high_num_blocks_with_motion || svc->last_layer_dropped[0])) {

     sf->mv.search_method = NSTEP;

-    sf->mv.fullpel_search_step_param = 2;

+    // TODO(marpan/jianj): Tune this setting for screensharing. For now use

+    // larger step_param for non-base layer, to avoid increase in encode time.

+    sf->mv.fullpel_search_step_param = (svc->spatial_layer_id == 0) ? 2 : 4;

   }

 }