120 lines
5.1 KiB
C++
120 lines
5.1 KiB
C++
/* 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 ContextModel3DBuffer.cpp
|
|
\brief context model 3D buffer class
|
|
*/
|
|
|
|
#include "ContextModel3DBuffer.h"
|
|
|
|
//! \ingroup TLibCommon
|
|
//! \{
|
|
|
|
// ====================================================================================================================
|
|
// Constructor / destructor / initialization / destroy
|
|
// ====================================================================================================================
|
|
|
|
ContextModel3DBuffer::ContextModel3DBuffer( UInt uiSizeZ, UInt uiSizeY, UInt uiSizeX, ContextModel *basePtr, Int &count )
|
|
: m_sizeX ( uiSizeX )
|
|
, m_sizeXY ( uiSizeX * uiSizeY )
|
|
, m_sizeXYZ( uiSizeX * uiSizeY * uiSizeZ )
|
|
{
|
|
// allocate 3D buffer
|
|
m_contextModel = basePtr;
|
|
count += m_sizeXYZ;
|
|
}
|
|
|
|
// ====================================================================================================================
|
|
// Public member functions
|
|
// ====================================================================================================================
|
|
|
|
/**
|
|
* Initialize 3D buffer with respect to slicetype, QP and given initial probability table
|
|
*
|
|
* \param eSliceType slice type
|
|
* \param iQp input QP value
|
|
* \param psCtxModel given probability table
|
|
*/
|
|
Void ContextModel3DBuffer::initBuffer( SliceType sliceType, Int qp, UChar* ctxModel )
|
|
{
|
|
ctxModel += sliceType * m_sizeXYZ;
|
|
|
|
for ( Int n = 0; n < m_sizeXYZ; n++ )
|
|
{
|
|
m_contextModel[ n ].init( qp, ctxModel[ n ] );
|
|
m_contextModel[ n ].setBinsCoded( 0 );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculate the cost of choosing a probability table based on the current probability of CABAC at encoder
|
|
*
|
|
* \param sliceType slice type
|
|
* \param qp input QP value
|
|
* \param ctxModel given probability table
|
|
*/
|
|
UInt ContextModel3DBuffer::calcCost( SliceType sliceType, Int qp, UChar* ctxModel )
|
|
{
|
|
UInt cost = 0;
|
|
ctxModel += sliceType * m_sizeXYZ;
|
|
|
|
for ( Int n = 0; n < m_sizeXYZ; n++ )
|
|
{
|
|
ContextModel tmpContextModel;
|
|
tmpContextModel.init( qp, ctxModel[ n ] );
|
|
|
|
// Map the 64 CABAC states to their corresponding probability values
|
|
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};
|
|
|
|
Double probLPS = aStateToProbLPS[ m_contextModel[ n ].getState() ];
|
|
Double prob0, prob1;
|
|
if (m_contextModel[ n ].getMps()==1)
|
|
{
|
|
prob0 = probLPS;
|
|
prob1 = 1.0-prob0;
|
|
}
|
|
else
|
|
{
|
|
prob1 = probLPS;
|
|
prob0 = 1.0-prob1;
|
|
}
|
|
|
|
if (m_contextModel[ n ].getBinsCoded()>0)
|
|
{
|
|
cost += (UInt) (prob0 * tmpContextModel.getEntropyBits( 0 ) + prob1 * tmpContextModel.getEntropyBits( 1 ));
|
|
}
|
|
}
|
|
|
|
return cost;
|
|
}
|
|
//! \}
|