source: 3DVCSoftware/branches/HTM-7.0-Fix/source/Lib/TLibCommon/ContextModel.h @ 458

Last change on this file since 458 was 296, checked in by tech, 11 years ago

Reintegrated branch 5.1-dev0 rev. 295.

  • Property svn:eol-style set to native
File size: 4.0 KB
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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) 2010-2012, 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.
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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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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
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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 __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#if CABAC_INIT_FLAG
60  ContextModel  ()                        { m_ucState = 0; m_binsCoded = 0; }
61#else
62  ContextModel  ()                        { m_ucState = 0;             }
63#endif
64  ~ContextModel ()                        {}
65 
66  UChar getState  ()                { return ( m_ucState >> 1 ); }                    ///< get current state
67  UChar getMps    ()                { return ( m_ucState  & 1 ); }                    ///< get curret MPS
68  Void  setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS
69 
70  Void init ( Int qp, Int initValue );   ///< initialize state with initial probability
71 
72  Void updateLPS ()
73  {
74    m_ucState = m_aucNextStateLPS[ m_ucState ];
75  }
76 
77  Void updateMPS ()
78  {
79    m_ucState = m_aucNextStateMPS[ m_ucState ];
80  }
81 
82  Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
83   
84#if FAST_BIT_EST
85  Void update( Int binVal )
86  {
87    m_ucState = m_nextState[m_ucState][binVal];
88  }
89  static Void buildNextStateTable();
90  static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
91#endif
92#if CABAC_INIT_FLAG
93  Void setBinsCoded(UInt val)   { m_binsCoded = val;  }
94  UInt getBinsCoded()           { return m_binsCoded;   }
95#endif
96 
97private:
98  UChar         m_ucState;                                                                  ///< internal state variable
99  static const  UChar m_aucNextStateMPS[ 128 ];
100  static const  UChar m_aucNextStateLPS[ 128 ];
101  static const Int m_entropyBits[ 128 ];
102#if FAST_BIT_EST
103  static UChar m_nextState[128][2];
104#endif
105#if CABAC_INIT_FLAG
106  UInt          m_binsCoded;
107#endif
108};
109
110//! \}
111
112#endif
113
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