libbpg-0.9.3

jctvc/TLibEncoder/TEncBinCoderCABACCounter.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     TEncBinCoderCABAC.cpp
+    \brief    binary entropy encoder of CABAC
+*/
+
+#include "TEncBinCoderCABACCounter.h"
+#include "TLibCommon/TComRom.h"
+#include "TLibCommon/Debug.h"
+
+
+#if FAST_BIT_EST
+
+//! \ingroup TLibEncoder
+//! \{
+
+
+TEncBinCABACCounter::TEncBinCABACCounter()
+{
+}
+
+TEncBinCABACCounter::~TEncBinCABACCounter()
+{
+}
+
+Void TEncBinCABACCounter::finish()
+{
+  m_pcTComBitIf->write(0, UInt(m_fracBits >> 15) );
+  m_fracBits &= 32767;
+}
+
+UInt TEncBinCABACCounter::getNumWrittenBits()
+{
+  return m_pcTComBitIf->getNumberOfWrittenBits() + UInt( m_fracBits >> 15 );
+}
+
+/**
+ * \brief Encode bin
+ *
+ * \param binValue   bin value
+ * \param rcCtxModel context model
+ */
+Void TEncBinCABACCounter::encodeBin( UInt binValue, ContextModel &rcCtxModel )
+{
+#ifdef DEBUG_ENCODER_SEARCH_BINS
+  const UInt64 startingFracBits = m_fracBits;
+#endif
+
+  m_uiBinsCoded += m_binCountIncrement;
+  m_fracBits += rcCtxModel.getEntropyBits( binValue );
+  rcCtxModel.update( binValue );
+
+#ifdef DEBUG_ENCODER_SEARCH_BINS
+  if ((g_debugCounter + debugEncoderSearchBinWindow) >= debugEncoderSearchBinTargetLine)
+    std::cout << g_debugCounter << ": coding bin value " << binValue << ", fracBits = [" << startingFracBits << "->" << m_fracBits << "]\n";
+
+  if (g_debugCounter >= debugEncoderSearchBinTargetLine)
+  {
+    Char breakPointThis;
+    breakPointThis = 7;
+  }
+  if (g_debugCounter >= (debugEncoderSearchBinTargetLine + debugEncoderSearchBinWindow)) exit(0);
+  g_debugCounter++;
+#endif
+}
+
+/**
+ * \brief Encode equiprobable bin
+ *
+ * \param binValue bin value
+ */
+Void TEncBinCABACCounter::encodeBinEP( UInt binValue )
+{
+  m_uiBinsCoded += m_binCountIncrement;
+  m_fracBits += 32768;
+}
+
+/**
+ * \brief Encode equiprobable bins
+ *
+ * \param binValues bin values
+ * \param numBins number of bins
+ */
+Void TEncBinCABACCounter::encodeBinsEP( UInt binValues, Int numBins )
+{
+  m_uiBinsCoded += numBins & -m_binCountIncrement;
+  m_fracBits += 32768 * numBins;
+}
+
+/**
+ * \brief Encode terminating bin
+ *
+ * \param binValue bin value
+ */
+Void TEncBinCABACCounter::encodeBinTrm( UInt binValue )
+{
+  m_uiBinsCoded += m_binCountIncrement;
+  m_fracBits += ContextModel::getEntropyBitsTrm( binValue );
+}
+
+Void TEncBinCABACCounter::align()
+{
+  m_fracBits = (m_fracBits + 32767) & (~32767);
+}
+
+//! \}
+#endif
+