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

diff --git a/vp9/encoder/vp9_pickmode.c b/vp9/encoder/vp9_pickmode.c
index f8ef450f1e4bbeb01a1fcb0b56e6d15157781b44..7e91369234695165cca9e8a4b8646978d42f9763 100644 (file)
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -1163,8 +1163,8 @@ static const REF_MODE ref_mode_set[RT_INTER_MODES] = {
   { 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 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x, TileDataEnc *tile_data,
   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 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x, TileDataEnc *tile_data,
     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;
@@ -1915,6 +1923,12 @@ void vp9_pick_inter_mode(VP9_COMP *cpi, MACROBLOCK *x, TileDataEnc *tile_data,
         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]);
+      }
     }
 
     if (!this_early_term) {