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vp9: SVC: Early exit on golden ref in non-rd pickmode.

For SVC 1 pass real-time: add condition to skip the
golden (spatial) reference mode in non-rd pickmode.
Condition is to skip golden if the sse of zeromv-last mode
is below threshold. And change order in ref_mode_set_svc
to make sure golden zeromv is tested after last-nearest.

Speedup ~3-4% with little/negligible quality loss.

Change-Id: I6cbe314a93210454ba2997945f714015f1b2fca3

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

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

@@ -1163,8 +1163,8 @@

   { ALTREF_FRAME, NEARMV }, { ALTREF_FRAME, NEWMV }

 };

 static const REF_MODE ref_mode_set_svc[RT_INTER_MODES] = {

-  { LAST_FRAME, ZEROMV },      { GOLDEN_FRAME, ZEROMV },

-  { LAST_FRAME, NEARESTMV },   { LAST_FRAME, NEARMV },

+  { LAST_FRAME, ZEROMV },      { LAST_FRAME, NEARESTMV },

+  { LAST_FRAME, NEARMV },      { GOLDEN_FRAME, ZEROMV },

   { GOLDEN_FRAME, NEARESTMV }, { GOLDEN_FRAME, NEARMV },

   { LAST_FRAME, NEWMV },       { GOLDEN_FRAME, NEWMV }

 };

@@ -1481,6 +1481,8 @@

   int use_golden_nonzeromv = 1;

   int force_skip_low_temp_var = 0;

   int skip_ref_find_pred[4] = { 0 };

+  unsigned int sse_zeromv_normalized = UINT_MAX;

+  unsigned int thresh_svc_skip_golden = 500;

 #if CONFIG_VP9_TEMPORAL_DENOISING

   VP9_PICKMODE_CTX_DEN ctx_den;

   int64_t zero_last_cost_orig = INT64_MAX;

@@ -1637,6 +1639,12 @@

     if (ref_frame > usable_ref_frame) continue;

     if (skip_ref_find_pred[ref_frame]) continue;

+    // For SVC, skip the golden (spatial) reference search if sse of zeromv_last

+    // is below threshold.

+    if (cpi->use_svc && ref_frame == GOLDEN_FRAME &&

+        sse_zeromv_normalized < thresh_svc_skip_golden)

+      continue;

+

     if (sf->short_circuit_flat_blocks && x->source_variance == 0 &&

         this_mode != NEARESTMV) {

       continue;

@@ -1914,6 +1922,12 @@

         rd_computed = 1;

         model_rd_for_sb_y(cpi, bsize, x, xd, &this_rdc.rate, &this_rdc.dist,

                           &var_y, &sse_y);

+      }

+      // Save normalized sse (between current and last frame) for (0, 0) motion.

+      if (cpi->use_svc && ref_frame == LAST_FRAME &&

+          frame_mv[this_mode][ref_frame].as_int == 0) {

+        sse_zeromv_normalized =

+            sse_y >> (b_width_log2_lookup[bsize] + b_height_log2_lookup[bsize]);

       }

     }