forked from mirror/libbpg
120 lines
5.1 KiB
C++
120 lines
5.1 KiB
C++
/* The copyright in this software is being made available under the BSD
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* License, included below. This software may be subject to other third party
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* and contributor rights, including patent rights, and no such rights are
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* granted under this license.
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*
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* Copyright (c) 2010-2014, ITU/ISO/IEC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/** \file ContextModel3DBuffer.cpp
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\brief context model 3D buffer class
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*/
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#include "ContextModel3DBuffer.h"
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//! \ingroup TLibCommon
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//! \{
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// ====================================================================================================================
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// Constructor / destructor / initialization / destroy
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// ====================================================================================================================
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ContextModel3DBuffer::ContextModel3DBuffer( UInt uiSizeZ, UInt uiSizeY, UInt uiSizeX, ContextModel *basePtr, Int &count )
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: m_sizeX ( uiSizeX )
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, m_sizeXY ( uiSizeX * uiSizeY )
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, m_sizeXYZ( uiSizeX * uiSizeY * uiSizeZ )
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{
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// allocate 3D buffer
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m_contextModel = basePtr;
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count += m_sizeXYZ;
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}
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// ====================================================================================================================
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// Public member functions
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// ====================================================================================================================
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/**
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* Initialize 3D buffer with respect to slicetype, QP and given initial probability table
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*
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* \param eSliceType slice type
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* \param iQp input QP value
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* \param psCtxModel given probability table
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*/
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Void ContextModel3DBuffer::initBuffer( SliceType sliceType, Int qp, UChar* ctxModel )
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{
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ctxModel += sliceType * m_sizeXYZ;
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for ( Int n = 0; n < m_sizeXYZ; n++ )
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{
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m_contextModel[ n ].init( qp, ctxModel[ n ] );
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m_contextModel[ n ].setBinsCoded( 0 );
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}
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}
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/**
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* Calculate the cost of choosing a probability table based on the current probability of CABAC at encoder
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*
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* \param sliceType slice type
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* \param qp input QP value
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* \param ctxModel given probability table
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*/
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UInt ContextModel3DBuffer::calcCost( SliceType sliceType, Int qp, UChar* ctxModel )
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{
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UInt cost = 0;
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ctxModel += sliceType * m_sizeXYZ;
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for ( Int n = 0; n < m_sizeXYZ; n++ )
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{
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ContextModel tmpContextModel;
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tmpContextModel.init( qp, ctxModel[ n ] );
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// Map the 64 CABAC states to their corresponding probability values
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static Double aStateToProbLPS[] = {0.50000000, 0.47460857, 0.45050660, 0.42762859, 0.40591239, 0.38529900, 0.36573242, 0.34715948, 0.32952974, 0.31279528, 0.29691064, 0.28183267, 0.26752040, 0.25393496, 0.24103941, 0.22879875, 0.21717969, 0.20615069, 0.19568177, 0.18574449, 0.17631186, 0.16735824, 0.15885931, 0.15079198, 0.14313433, 0.13586556, 0.12896592, 0.12241667, 0.11620000, 0.11029903, 0.10469773, 0.09938088, 0.09433404, 0.08954349, 0.08499621, 0.08067986, 0.07658271, 0.07269362, 0.06900203, 0.06549791, 0.06217174, 0.05901448, 0.05601756, 0.05317283, 0.05047256, 0.04790942, 0.04547644, 0.04316702, 0.04097487, 0.03889405, 0.03691890, 0.03504406, 0.03326442, 0.03157516, 0.02997168, 0.02844963, 0.02700488, 0.02563349, 0.02433175, 0.02309612, 0.02192323, 0.02080991, 0.01975312, 0.01875000};
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Double probLPS = aStateToProbLPS[ m_contextModel[ n ].getState() ];
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Double prob0, prob1;
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if (m_contextModel[ n ].getMps()==1)
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{
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prob0 = probLPS;
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prob1 = 1.0-prob0;
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}
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else
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{
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prob1 = probLPS;
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prob0 = 1.0-prob1;
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}
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if (m_contextModel[ n ].getBinsCoded()>0)
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{
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cost += (UInt) (prob0 * tmpContextModel.getEntropyBits( 0 ) + prob1 * tmpContextModel.getEntropyBits( 1 ));
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}
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}
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return cost;
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}
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//! \}
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