source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.h @ 1413

Last change on this file since 1413 was 1413, checked in by tech, 6 years ago

Merged HTM-16.2-dev@1412

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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
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4 * granted under this license.
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6 * Copyright (c) 2010-2017, ITU/ISO/IEC
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9 * Redistribution and use in source and binary forms, with or without
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18 *    be used to endorse or promote products derived from this software without
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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
57class ContextModel
58{
59public:
60  ContextModel  ()                        { m_ucState = 0; m_binsCoded = 0; }
61  ~ContextModel ()                        {}
62
63  UChar getState  ()                { return ( m_ucState >> 1 ); }                    ///< get current state
64  UChar getMps    ()                { return ( m_ucState  & 1 ); }                    ///< get curret MPS
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
69  Void updateLPS ()
70  {
71    m_ucState = m_aucNextStateLPS[ m_ucState ];
72  }
73
74  Void updateMPS ()
75  {
76    m_ucState = m_aucNextStateMPS[ m_ucState ];
77  }
78
79  Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
80
81#if FAST_BIT_EST
82  Void update( Int binVal )
83  {
84    m_ucState = m_nextState[m_ucState][binVal];
85  }
86  static Void buildNextStateTable();
87  static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
88#endif
89  Void setBinsCoded(UInt val)   { m_binsCoded = val;  }
90  UInt getBinsCoded()           { return m_binsCoded;   }
91
92private:
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
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