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vp9: SVC: Modify mv search condition in speed features.

For SVC at speed >= 7: only use the improved mv search
on base spatial layer, if top layer resolution is above 640x360.

~2.3% speedup
Small/negligible loss in avgPSNR metrics on rtc set.

Change-Id: Iaef75a57ebf1c248931bc1aa28d20b7fecac1851

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

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

@@ -560,8 +560,12 @@

     sf->adaptive_rd_thresh = 3;

     sf->mv.search_method = FAST_DIAMOND;

     sf->mv.fullpel_search_step_param = 10;

+    // For SVC: use better mv search on base temporal layer, and only

+    // on base spatial layer if highest resolution is above 640x360.

     if (cpi->svc.number_temporal_layers > 2 &&

-        cpi->svc.temporal_layer_id == 0) {

+        cpi->svc.temporal_layer_id == 0 &&

+        (cpi->svc.spatial_layer_id == 0 ||

+         cpi->oxcf.width * cpi->oxcf.height <= 640 * 360)) {

       sf->mv.search_method = NSTEP;

       sf->mv.fullpel_search_step_param = 6;

     }

-- 

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