shithub: libvpx

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ref: e350e3fe68bef41d824aaef0f7fed4baa70c773b
parent: 28a1ee86b9df48925ea99657bb542a79dca44f17
parent: e4aac6bb61cba7ab387a959c82b292ead6eba758
author: Yunqing Wang <yunqingwang@google.com>
date: Wed Oct 1 12:19:56 EDT 2014 

Merge "Modify block transform skipping check"


--- a/vp9/encoder/vp9_quantize.c
+++ b/vp9/encoder/vp9_quantize.c
@@ -641,13 +641,14 @@
   x->plane[0].quant_shift = quants->y_quant_shift[qindex];
   x->plane[0].zbin = quants->y_zbin[qindex];
   x->plane[0].round = quants->y_round[qindex];
-  x->plane[0].quant_thred[0] = cm->y_dequant[qindex][0] *
-                                  cm->y_dequant[qindex][0];
-  x->plane[0].quant_thred[1] = cm->y_dequant[qindex][1] *
-                                  cm->y_dequant[qindex][1];
   x->plane[0].zbin_extra = (int16_t)((cm->y_dequant[qindex][1] * zbin) >> 7);
   xd->plane[0].dequant = cm->y_dequant[qindex];
 
+  x->plane[0].quant_thred[0] = (x->plane[0].zbin[0] + x->plane[0].zbin_extra) *
+      (x->plane[0].zbin[0] + x->plane[0].zbin_extra);
+  x->plane[0].quant_thred[1] = (x->plane[0].zbin[1] + x->plane[0].zbin_extra) *
+      (x->plane[0].zbin[1] + x->plane[0].zbin_extra);
+
   // UV
   for (i = 1; i < 3; i++) {
     x->plane[i].quant = quants->uv_quant[qindex];
@@ -656,12 +657,15 @@
     x->plane[i].quant_shift = quants->uv_quant_shift[qindex];
     x->plane[i].zbin = quants->uv_zbin[qindex];
     x->plane[i].round = quants->uv_round[qindex];
-    x->plane[i].quant_thred[0] = cm->y_dequant[qindex][0] *
-                                    cm->y_dequant[qindex][0];
-    x->plane[i].quant_thred[1] = cm->y_dequant[qindex][1] *
-                                    cm->y_dequant[qindex][1];
     x->plane[i].zbin_extra = (int16_t)((cm->uv_dequant[qindex][1] * zbin) >> 7);
     xd->plane[i].dequant = cm->uv_dequant[qindex];
+
+    x->plane[i].quant_thred[0] =
+        (x->plane[i].zbin[0] + x->plane[i].zbin_extra) *
+        (x->plane[i].zbin[0] + x->plane[i].zbin_extra);
+    x->plane[i].quant_thred[1] =
+        (x->plane[i].zbin[1] + x->plane[i].zbin_extra) *
+        (x->plane[i].zbin[1] + x->plane[i].zbin_extra);
   }
 
   x->skip_block = vp9_segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP);
--- a/vp9/encoder/vp9_rdopt.c
+++ b/vp9/encoder/vp9_rdopt.c
@@ -180,7 +180,7 @@
   unsigned int sse;
   unsigned int var = 0;
   unsigned int sum_sse = 0;
-  const int shift = 8;
+  const int shift = 6;
   int rate;
   int64_t dist;
 
@@ -212,12 +212,16 @@
         sum_sse += sse;
 
         if (!x->select_tx_size) {
-          if (x->bsse[(i << 2) + block_idx] < p->quant_thred[0] >> shift)
-            x->skip_txfm[(i << 2) + block_idx] = 1;
-          else if (var < p->quant_thred[1] >> shift)
+          // Check if all ac coefficients can be quantized to zero.
+          if (var < p->quant_thred[1] >> shift) {
             x->skip_txfm[(i << 2) + block_idx] = 2;
-          else
+
+            // Check if dc coefficient can be quantized to zero.
+            if (sse - var < p->quant_thred[0] >> shift)
+              x->skip_txfm[(i << 2) + block_idx] = 1;
+          } else {
             x->skip_txfm[(i << 2) + block_idx] = 0;
+          }
         }
 
         if (i == 0)
@@ -484,9 +488,15 @@
       vp9_xform_quant_dc(x, plane, block, plane_bsize, tx_size);
       args->sse  = x->bsse[(plane << 2) + (block >> (tx_size << 1))] << 4;
       args->dist = args->sse;
-      if (!x->plane[plane].eobs[block])
-        args->dist = args->sse - ((coeff[0] * coeff[0] -
-            (coeff[0] - dqcoeff[0]) * (coeff[0] - dqcoeff[0])) >> 2);
+      if (x->plane[plane].eobs[block]) {
+        int64_t dc_correct = coeff[0] * coeff[0] -
+            (coeff[0] - dqcoeff[0]) * (coeff[0] - dqcoeff[0]);
+
+        if (tx_size != TX_32X32)
+          dc_correct >>= 2;
+
+        args->dist = args->sse - dc_correct;
+      }
     } else {
       // skip forward transform
       x->plane[plane].eobs[block] = 0;