forked from mirror/libbpg
109 lines
4 KiB
C
109 lines
4 KiB
C
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/* 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 ContextModel.h
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\brief context model class (header)
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*/
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#ifndef __CONTEXTMODEL__
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#define __CONTEXTMODEL__
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#if _MSC_VER > 1000
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#pragma once
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#endif // _MSC_VER > 1000
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#include "CommonDef.h"
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#include "TComRom.h"
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//! \ingroup TLibCommon
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//! \{
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// ====================================================================================================================
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// Class definition
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// ====================================================================================================================
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/// context model class
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class ContextModel
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{
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public:
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ContextModel () { m_ucState = 0; m_binsCoded = 0; }
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~ContextModel () {}
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UChar getState () { return ( m_ucState >> 1 ); } ///< get current state
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UChar getMps () { return ( m_ucState & 1 ); } ///< get curret MPS
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Void setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS
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Void init ( Int qp, Int initValue ); ///< initialize state with initial probability
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Void updateLPS ()
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{
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m_ucState = m_aucNextStateLPS[ m_ucState ];
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}
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Void updateMPS ()
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{
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m_ucState = m_aucNextStateMPS[ m_ucState ];
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}
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Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
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#if FAST_BIT_EST
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Void update( Int binVal )
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{
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m_ucState = m_nextState[m_ucState][binVal];
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}
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static Void buildNextStateTable();
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static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
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#endif
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Void setBinsCoded(UInt val) { m_binsCoded = val; }
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UInt getBinsCoded() { return m_binsCoded; }
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private:
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UChar m_ucState; ///< internal state variable
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static const UInt m_totalStates = (1 << CONTEXT_STATE_BITS) * 2; //*2 for MPS = [0|1]
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static const UChar m_aucNextStateMPS[m_totalStates];
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static const UChar m_aucNextStateLPS[m_totalStates];
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static const Int m_entropyBits [m_totalStates];
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#if FAST_BIT_EST
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static UChar m_nextState[m_totalStates][2 /*MPS = [0|1]*/];
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#endif
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UInt m_binsCoded;
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};
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//! \}
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#endif
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