source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.h @ 872

Last change on this file since 872 was 872, checked in by tech, 10 years ago

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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
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.
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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
19 *    specific prior written permission.
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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 __CONTEXT_MODEL__
40#define __CONTEXT_MODEL__
41
42#if _MSC_VER > 1000
43#pragma once
44#endif // _MSC_VER > 1000
45
46#include "CommonDef.h"
47
48//! \ingroup TLibCommon
49//! \{
50
51// ====================================================================================================================
52// Class definition
53// ====================================================================================================================
54
55/// context model class
56class ContextModel
57{
58public:
59  ContextModel  ()                        { m_ucState = 0; m_binsCoded = 0; }
60  ~ContextModel ()                        {}
61 
62  UChar getState  ()                { return ( m_ucState >> 1 ); }                    ///< get current state
63  UChar getMps    ()                { return ( m_ucState  & 1 ); }                    ///< get curret MPS
64  Void  setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS
65 
66  Void init ( Int qp, Int initValue );   ///< initialize state with initial probability
67 
68  Void updateLPS ()
69  {
70    m_ucState = m_aucNextStateLPS[ m_ucState ];
71  }
72 
73  Void updateMPS ()
74  {
75    m_ucState = m_aucNextStateMPS[ m_ucState ];
76  }
77 
78  Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
79   
80#if FAST_BIT_EST
81  Void update( Int binVal )
82  {
83    m_ucState = m_nextState[m_ucState][binVal];
84  }
85  static Void buildNextStateTable();
86  static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
87#endif
88  Void setBinsCoded(UInt val)   { m_binsCoded = val;  }
89  UInt getBinsCoded()           { return m_binsCoded;   }
90 
91private:
92  UChar         m_ucState;                                                                  ///< internal state variable
93  static const  UChar m_aucNextStateMPS[ 128 ];
94  static const  UChar m_aucNextStateLPS[ 128 ];
95  static const Int m_entropyBits[ 128 ];
96#if FAST_BIT_EST
97  static UChar m_nextState[128][2];
98#endif
99  UInt          m_binsCoded;
100};
101
102//! \}
103
104#endif
105
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