1 /* The copyright in this software is being made available under the BSD 2 * License, included below. This software may be subject to other third party 3 * and contributor rights, including patent rights, and no such rights are 4 * granted under this license. 5 * 6 * Copyright (c) 2010-2014, ITU/ISO/IEC 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * 12 * * Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above copyright notice, 15 * this list of conditions and the following disclaimer in the documentation 16 * and/or other materials provided with the distribution. 17 * * Neither the name of the ITU/ISO/IEC nor the names of its contributors may 18 * be used to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 31 * THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 35 /** \file ContextModel.h 36 \brief context model class (header) 37 */ 38 39 #ifndef __CONTEXTMODEL__ 40 #define __CONTEXTMODEL__ 41 42 #if _MSC_VER > 1000 43 #pragma once 44 #endif // _MSC_VER > 1000 45 46 #include "CommonDef.h" 47 #include "TComRom.h" 48 49 //! \ingroup TLibCommon 50 //! \{ 51 52 // ==================================================================================================================== 53 // Class definition 54 // ==================================================================================================================== 55 56 /// context model class 57 class ContextModel 58 { 59 public: ContextModel()60 ContextModel () { m_ucState = 0; m_binsCoded = 0; } ~ContextModel()61 ~ContextModel () {} 62 getState()63 UChar getState () { return ( m_ucState >> 1 ); } ///< get current state getMps()64 UChar getMps () { return ( m_ucState & 1 ); } ///< get curret MPS setStateAndMps(UChar ucState,UChar ucMPS)65 Void setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS 66 67 Void init ( Int qp, Int initValue ); ///< initialize state with initial probability 68 updateLPS()69 Void updateLPS () 70 { 71 m_ucState = m_aucNextStateLPS[ m_ucState ]; 72 } 73 updateMPS()74 Void updateMPS () 75 { 76 m_ucState = m_aucNextStateMPS[ m_ucState ]; 77 } 78 getEntropyBits(Short val)79 Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; } 80 81 #if FAST_BIT_EST update(Int binVal)82 Void update( Int binVal ) 83 { 84 m_ucState = m_nextState[m_ucState][binVal]; 85 } 86 static Void buildNextStateTable(); getEntropyBitsTrm(Int val)87 static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; } 88 #endif setBinsCoded(UInt val)89 Void setBinsCoded(UInt val) { m_binsCoded = val; } getBinsCoded()90 UInt getBinsCoded() { return m_binsCoded; } 91 92 private: 93 UChar m_ucState; ///< internal state variable 94 95 static const UInt m_totalStates = (1 << CONTEXT_STATE_BITS) * 2; //*2 for MPS = [0|1] 96 static const UChar m_aucNextStateMPS[m_totalStates]; 97 static const UChar m_aucNextStateLPS[m_totalStates]; 98 static const Int m_entropyBits [m_totalStates]; 99 #if FAST_BIT_EST 100 static UChar m_nextState[m_totalStates][2 /*MPS = [0|1]*/]; 101 #endif 102 UInt m_binsCoded; 103 }; 104 105 //! \} 106 107 #endif 108 109