[x265] [PATCH] WeightPrediction: Avoid motion compensation when difPoc is large

[Kavitha Sampath]

# HG changeset patch
# User Kavitha Sampath <kavitha at multicorewareinc.com>
# Date 1390891330 -19800
#      Tue Jan 28 12:12:10 2014 +0530
# Node ID 7abfa3ed39001e591c2def68eb05e4282f7e9414
# Parent  3c2441447f2a26fbe087ed9b420fc3fd087163c3
WeightPrediction: Avoid motion compensation when difPoc is large

diff -r 3c2441447f2a -r 7abfa3ed3900 source/encoder/frameencoder.cpp
--- a/source/encoder/frameencoder.cpp Mon Jan 27 14:17:25 2014 -0600
+++ b/source/encoder/frameencoder.cpp Tue Jan 28 12:12:10 2014 +0530
@@ -465,7 +465,7 @@

 //------------------------------------------------------------------------------
         //  Weighted Prediction implemented at Slice level. SliceMode=2 is
not supported yet.

 //------------------------------------------------------------------------------
-        WeightPrediction wp(slice);
+        WeightPrediction wp(slice, m_cfg->param);
         wp.weightAnalyseEnc();
     }

diff -r 3c2441447f2a -r 7abfa3ed3900 source/encoder/weightPrediction.cpp
--- a/source/encoder/weightPrediction.cpp Mon Jan 27 14:17:25 2014 -0600
+++ b/source/encoder/weightPrediction.cpp Tue Jan 28 12:12:10 2014 +0530
@@ -188,20 +188,20 @@
     {
         for (int refIdxTemp = 0; (refIdxTemp <
m_slice->getNumRefIdx(list)) && (numWeighted < 8); refIdxTemp++)
         {
+            bool mcFlag = false;
             check = 0;
             fw = m_wp[list][refIdxTemp];
             ref  = &m_slice->getRefPic(list, refIdxTemp)->m_lowres;
             refPoc = m_slice->getRefPic(list, refIdxTemp)->getPOC();
             difPoc = abs(curPoc - refPoc);
-            if (difPoc > m_bframes + 1)
-                continue;
-            else
+            if (difPoc <= m_bframes + 1)
             {
                 m_mvs = fenc->lowresMvs[list][difPoc - 1];
-                if (m_mvs[0].x == 0x7FFF)
-                    continue;
-                else
+                if (m_mvs[0].x != 0x7FFF)
+                {
                     m_mvCost = fenc->lowresMvCosts[0][difPoc - 1];
+                    mcFlag = true;
+                }
             }
             const float epsilon = 1.f / 128.f;
             float guessScale[3], fencMean[3], refMean[3];
@@ -245,42 +245,44 @@
                 switch (yuv)
                 {
                 case 0:
-                {
+
                     m_mcbuf = ref->fpelPlane;
                     m_inbuf = fenc->lowresPlane[0];
-                    pixel *tempm_buf;
-                    pixel m_buf8[8 * 8];
-                    int pixoff = 0, cu = 0;
-                    intptr_t strd;
-                    for (int y = 0; y < m_frmHeight; y += 8, pixoff = y *
m_refStride)
+                    if (mcFlag)
                     {
-                        for (int x = 0; x < m_frmWidth; x += 8, pixoff +=
8, cu++)
+                        pixel *tempm_buf;
+                        pixel m_buf8[8 * 8];
+                        int pixoff = 0, cu = 0;
+                        intptr_t strd;
+                        for (int y = 0; y < m_frmHeight; y += 8, pixoff =
y * m_refStride)
                         {
-                            if (m_mvCost[cu] > fenc->intraCost[cu])
+                            for (int x = 0; x < m_frmWidth; x += 8, pixoff
+= 8, cu++)
                             {
-                                strd = m_refStride;
-                                tempm_buf = m_inbuf + pixoff;
+                                if (m_mvCost[cu] > fenc->intraCost[cu])
+                                {
+                                    strd = m_refStride;
+                                    tempm_buf = m_inbuf + pixoff;
+                                }
+                                else
+                                {
+                                    strd = 8;
+                                    tempm_buf = ref->lowresMC(pixoff,
m_mvs[cu], m_buf8, strd);
+                                    ic++;
+                                }
+                                primitives.blockcpy_pp(8, 8, m_buf + (y *
m_refStride) + x, m_refStride, tempm_buf, strd);
                             }
-                            else
-                            {
-                                strd = 8;
-                                tempm_buf = ref->lowresMC(pixoff,
m_mvs[cu], m_buf8, strd);
-                                ic++;
-                            }
-                            primitives.blockcpy_pp(8, 8, m_buf + (y *
m_refStride) + x, m_refStride, tempm_buf, strd);
                         }
+
+                        m_mcbuf = m_buf;
                     }
-
-                    m_mcbuf = m_buf;
                     break;
-                }

                 case 1:

                     m_mcbuf = m_slice->getRefPic(list,
refIdxTemp)->getPicYuvOrg()->getCbAddr();
                     m_inbuf =
m_slice->getPic()->getPicYuvOrg()->getCbAddr();
                     m_blockSize = 8;
-                    mcChroma();
+                    if (mcFlag) mcChroma();
                     break;

                 case 2:
@@ -288,7 +290,7 @@
                     m_mcbuf = m_slice->getRefPic(list,
refIdxTemp)->getPicYuvOrg()->getCrAddr();
                     m_inbuf =
m_slice->getPic()->getPicYuvOrg()->getCrAddr();
                     m_blockSize = 8;
-                    mcChroma();
+                    if (mcFlag) mcChroma();
                     break;
                 }
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