libbpg-0.9.3

jctvc/TLibEncoder/TEncPreanalyzer.cpp

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+/* The copyright in this software is being made available under the BSD
+ * License, included below. This software may be subject to other third party
+ * and contributor rights, including patent rights, and no such rights are
+ * granted under this license.
+ *
+ * Copyright (c) 2010-2014, ITU/ISO/IEC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
+ *    be used to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** \file     TEncPreanalyzer.cpp
+    \brief    source picture analyzer class
+*/
+
+#include <cfloat>
+#include <algorithm>
+
+#include "TEncPreanalyzer.h"
+
+using namespace std;
+
+//! \ingroup TLibEncoder
+//! \{
+
+/** Constructor
+ */
+TEncPreanalyzer::TEncPreanalyzer()
+{
+}
+
+/** Destructor
+ */
+TEncPreanalyzer::~TEncPreanalyzer()
+{
+}
+
+/** Analyze source picture and compute local image characteristics used for QP adaptation
+ * \param pcEPic Picture object to be analyzed
+ * \return Void
+ */
+Void TEncPreanalyzer::xPreanalyze( TEncPic* pcEPic )
+{
+  TComPicYuv* pcPicYuv = pcEPic->getPicYuvOrg();
+  const Int iWidth = pcPicYuv->getWidth(COMPONENT_Y);
+  const Int iHeight = pcPicYuv->getHeight(COMPONENT_Y);
+  const Int iStride = pcPicYuv->getStride(COMPONENT_Y);
+
+  for ( UInt d = 0; d < pcEPic->getMaxAQDepth(); d++ )
+  {
+    const Pel* pLineY = pcPicYuv->getAddr(COMPONENT_Y);
+    TEncPicQPAdaptationLayer* pcAQLayer = pcEPic->getAQLayer(d);
+    const UInt uiAQPartWidth = pcAQLayer->getAQPartWidth();
+    const UInt uiAQPartHeight = pcAQLayer->getAQPartHeight();
+    TEncQPAdaptationUnit* pcAQU = pcAQLayer->getQPAdaptationUnit();
+
+    Double dSumAct = 0.0;
+    for ( UInt y = 0; y < iHeight; y += uiAQPartHeight )
+    {
+      const UInt uiCurrAQPartHeight = min(uiAQPartHeight, iHeight-y);
+      for ( UInt x = 0; x < iWidth; x += uiAQPartWidth, pcAQU++ )
+      {
+        const UInt uiCurrAQPartWidth = min(uiAQPartWidth, iWidth-x);
+        const Pel* pBlkY = &pLineY[x];
+        UInt64 uiSum[4] = {0, 0, 0, 0};
+        UInt64 uiSumSq[4] = {0, 0, 0, 0};
+        UInt uiNumPixInAQPart = 0;
+        UInt by = 0;
+        for ( ; by < uiCurrAQPartHeight>>1; by++ )
+        {
+          UInt bx = 0;
+          for ( ; bx < uiCurrAQPartWidth>>1; bx++, uiNumPixInAQPart++ )
+          {
+            uiSum  [0] += pBlkY[bx];
+            uiSumSq[0] += pBlkY[bx] * pBlkY[bx];
+          }
+          for ( ; bx < uiCurrAQPartWidth; bx++, uiNumPixInAQPart++ )
+          {
+            uiSum  [1] += pBlkY[bx];
+            uiSumSq[1] += pBlkY[bx] * pBlkY[bx];
+          }
+          pBlkY += iStride;
+        }
+        for ( ; by < uiCurrAQPartHeight; by++ )
+        {
+          UInt bx = 0;
+          for ( ; bx < uiCurrAQPartWidth>>1; bx++, uiNumPixInAQPart++ )
+          {
+            uiSum  [2] += pBlkY[bx];
+            uiSumSq[2] += pBlkY[bx] * pBlkY[bx];
+          }
+          for ( ; bx < uiCurrAQPartWidth; bx++, uiNumPixInAQPart++ )
+          {
+            uiSum  [3] += pBlkY[bx];
+            uiSumSq[3] += pBlkY[bx] * pBlkY[bx];
+          }
+          pBlkY += iStride;
+        }
+
+        Double dMinVar = DBL_MAX;
+        for ( Int i=0; i<4; i++)
+        {
+          const Double dAverage = Double(uiSum[i]) / uiNumPixInAQPart;
+          const Double dVariance = Double(uiSumSq[i]) / uiNumPixInAQPart - dAverage * dAverage;
+          dMinVar = min(dMinVar, dVariance);
+        }
+        const Double dActivity = 1.0 + dMinVar;
+        pcAQU->setActivity( dActivity );
+        dSumAct += dActivity;
+      }
+      pLineY += iStride * uiCurrAQPartHeight;
+    }
+
+    const Double dAvgAct = dSumAct / (pcAQLayer->getNumAQPartInWidth() * pcAQLayer->getNumAQPartInHeight());
+    pcAQLayer->setAvgActivity( dAvgAct );
+  }
+}
+//! \}
+