[x265] [PATCH 3 of 3] analysis: share skip/merge data for rd levels 0 to 4

[kavitha at multicorewareinc.com]

# HG changeset patch
# User Kavitha Sampath <kavitha at multicorewareinc.com>
# Date 1454661586 -19800
#      Fri Feb 05 14:09:46 2016 +0530
# Node ID b0069da6f07bef922e3cc9434df99d06c03628b6
# Parent  969e64f43b9623c130317779a508b5c1bd57231a
analysis: share skip/merge data for rd levels 0 to 4

diff -r 969e64f43b96 -r b0069da6f07b source/encoder/analysis.cpp
--- a/source/encoder/analysis.cpp	Mon Feb 08 12:07:27 2016 +0530
+++ b/source/encoder/analysis.cpp	Fri Feb 05 14:09:46 2016 +0530
@@ -899,8 +899,24 @@
         md.pred[PRED_2Nx2N].sa8dCost = 0;
     }
 
+    bool bNoSplit = false;
+    if (m_param->analysisMode == X265_ANALYSIS_LOAD)
+    {
+        uint8_t* reuseDepth = &m_reuseInterDataCTU->depth[parentCTU.m_cuAddr * parentCTU.m_numPartitions];
+        uint8_t* reuseModes = &m_reuseInterDataCTU->modes[parentCTU.m_cuAddr * parentCTU.m_numPartitions];
+        if (mightNotSplit && depth == reuseDepth[cuGeom.absPartIdx] && reuseModes[cuGeom.absPartIdx] == MODE_SKIP)
+        {
+            md.pred[PRED_MERGE].cu.initSubCU(parentCTU, cuGeom, qp);
+            md.pred[PRED_SKIP].cu.initSubCU(parentCTU, cuGeom, qp);
+            checkMerge2Nx2N_rd0_4(md.pred[PRED_SKIP], md.pred[PRED_MERGE], cuGeom);
+
+            bNoSplit = true;
+            earlyskip = md.bestMode && m_param->bEnableEarlySkip;
+        }
+    }
+
     /* Step 1. Evaluate Merge/Skip candidates for likely early-outs */
-    if (mightNotSplit && depth >= minDepth)
+    if (mightNotSplit && depth >= minDepth && !bNoSplit)
     {
         /* Compute Merge Cost */
         md.pred[PRED_MERGE].cu.initSubCU(parentCTU, cuGeom, qp);
@@ -910,7 +926,6 @@
             earlyskip = m_param->bEnableEarlySkip && md.bestMode && md.bestMode->cu.isSkipped(0); // TODO: sa8d threshold per depth
     }
 
-    bool bNoSplit = false;
     if (md.bestMode)
     {
         bNoSplit = md.bestMode->cu.isSkipped(0);