[x265] [PATCH] sliceype: Bidir cost estimation added to lookahead

[deepthidevaki at multicorewareinc.com]

# HG changeset patch
# User Deepthi Devaki <deepthidevaki at multicorewareinc.com>
# Date 1381213898 -19800
# Node ID 8f4428d24e63ae85495597864567071275397db0
# Parent  d71078917df01e92605158a13b45ab35ee7cfc1c
sliceype: Bidir cost estimation added to lookahead

diff -r d71078917df0 -r 8f4428d24e63 source/encoder/slicetype.cpp
--- a/source/encoder/slicetype.cpp	Mon Oct 07 12:48:32 2013 +0530
+++ b/source/encoder/slicetype.cpp	Tue Oct 08 12:01:38 2013 +0530
@@ -407,6 +407,28 @@
             *fenc_costs[i] = me.motionEstimate(i ? fref1 : fref0, mvmin, mvmax, mvp, numc, mvc, merange, *fenc_mvs[i]);
             COPY2_IF_LT(bcost, *fenc_costs[i], listused, i + 1);
         }
+        if(bBidir)
+        {
+            int hpel = ((*fenc_mvs[0]).y & 2) | (((*fenc_mvs[0]).x & 2) >> 1);
+            pixel *src0 = fref0->lowresPlane[hpel] + pelOffset + ((*fenc_mvs[0]).x >> 2) + ((*fenc_mvs[0]).y >> 2) * fref0->lumaStride;
+            hpel = ((*fenc_mvs[1]).y & 2) | (((*fenc_mvs[1]).x & 2) >> 1);
+            pixel *src1 = fref1->lowresPlane[hpel] + pelOffset + ((*fenc_mvs[1]).x >> 2) + ((*fenc_mvs[1]).y >> 2) * fref1->lumaStride;
+
+            pixel ref[X265_LOWRES_CU_SIZE * X265_LOWRES_CU_SIZE];
+            primitives.pixelavg_pp[PARTITION_8x8](ref, X265_LOWRES_CU_SIZE, src0, fref0->lumaStride, src1, fref1->lumaStride, 0);
+
+            int bicost = primitives.sad[PARTITION_8x8](fenc->lowresPlane[0] + pelOffset, fenc->lumaStride, ref, X265_LOWRES_CU_SIZE);
+            COPY2_IF_LT(bcost, bicost, listused, 3);        
+
+            //Try 0,0 candidates
+            src0 = fref0->lowresPlane[0] + pelOffset;
+            src1 = fref1->lowresPlane[0] + pelOffset;
+
+            primitives.pixelavg_pp[PARTITION_8x8](ref, X265_LOWRES_CU_SIZE, src0, fref0->lumaStride, src1, fref1->lumaStride, 0);
+
+            bicost = primitives.sad[PARTITION_8x8](fenc->lowresPlane[0] + pelOffset, fenc->lumaStride, ref, X265_LOWRES_CU_SIZE);
+            COPY2_IF_LT(bcost, bicost, listused, 3);
+        }
     }
     if (!fenc->bIntraCalculated)
     {