[x265] [PATCH] WeightPrediction: Do not use lowres MV/MVcost for invalid MVs/MVcosts

[kavitha at multicorewareinc.com]

# HG changeset patch
# User Kavitha Sampath <kavitha at multicorewareinc.com>
# Date 1390381383 -19800
#      Wed Jan 22 14:33:03 2014 +0530
# Node ID 54a500764f64cad82e43c79b9313276344be8300
# Parent  0f0ad4c094bd840b5a3183425670bee51434cdf7
WeightPrediction: Do not use lowres MV/MVcost for invalid MVs/MVcosts

diff -r 0f0ad4c094bd -r 54a500764f64 source/encoder/weightPrediction.cpp
--- a/source/encoder/weightPrediction.cpp	Tue Jan 21 16:39:44 2014 -0600
+++ b/source/encoder/weightPrediction.cpp	Wed Jan 22 14:33:03 2014 +0530
@@ -196,7 +196,13 @@
             refPoc = m_slice->getRefPic(list, refIdxTemp)->getPOC();
             difPoc = abs(curPoc - refPoc);
             m_mvs = fenc->lowresMvs[list][difPoc - 1];
-            if (m_mvs) m_mvCost = fenc->lowresMvCosts[0][difPoc - 1];
+            if (m_mvs)
+            {
+                if (m_mvs[0].x == 0x7FFF)
+                    continue;
+                else
+                    m_mvCost = fenc->lowresMvCosts[0][difPoc - 1];
+            }
             const float epsilon = 1.f / 128.f;
             float guessScale[3], fencMean[3], refMean[3];