source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.h @ 747

Last change on this file since 747 was 608, checked in by tech, 11 years ago

Merged DEV-2.0-dev0@604.

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[5]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
[56]4 * granted under this license. 
[5]5 *
[608]6 * Copyright (c) 2010-2013, ITU/ISO/IEC
[5]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.
[56]17 *  * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
[5]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
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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 */
[2]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
[56]48//! \ingroup TLibCommon
49//! \{
[2]50
51// ====================================================================================================================
52// Class definition
53// ====================================================================================================================
54
55/// context model class
56class ContextModel
57{
58public:
[56]59  ContextModel  ()                        { m_ucState = 0; m_binsCoded = 0; }
[2]60  ~ContextModel ()                        {}
61 
[56]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
[2]65 
[56]66  Void init ( Int qp, Int initValue );   ///< initialize state with initial probability
[2]67 
[56]68  Void updateLPS ()
[2]69  {
[56]70    m_ucState = m_aucNextStateLPS[ m_ucState ];
[2]71  }
72 
[56]73  Void updateMPS ()
[2]74  {
[56]75    m_ucState = m_aucNextStateMPS[ m_ucState ];
[2]76  }
77 
[56]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 
[2]91private:
92  UChar         m_ucState;                                                                  ///< internal state variable
[56]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;
[2]100};
101
[56]102//! \}
103
[2]104#endif
105
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