source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.h @ 5

Last change on this file since 5 was 5, checked in by hhi, 12 years ago

Clean version with cfg-files

  • Property svn:eol-style set to native
File size: 3.4 KB
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1/* The copyright in this software is being made available under the BSD
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33
34
35
36
37/** \file     ContextModel.h
38    \brief    context model class (header)
39*/
40
41#ifndef __CONTEXT_MODEL__
42#define __CONTEXT_MODEL__
43
44#if _MSC_VER > 1000
45#pragma once
46#endif // _MSC_VER > 1000
47
48#include "CommonDef.h"
49
50
51// ====================================================================================================================
52// Class definition
53// ====================================================================================================================
54
55/// context model class
56class ContextModel
57{
58public:
59  ContextModel  ()                        { m_ucState = 0;             }
60  ~ContextModel ()                        {}
61 
62  const UChar getState  ()                { return ( m_ucState >> 1 ); }                    ///< get current state
63  const UChar getMps    ()                { return ( m_ucState  & 1 ); }                    ///< get curret MPS
64 
65  Void        init      ( Int   iQp, 
66                         Short asCtxInit[] );                                              ///< initialize state with initial prob.
67 
68  Void        updateLPS ()
69  {
70    UChar ucMPS = ( m_ucState > 1    ? m_ucState  & 1 :    1   - ( m_ucState & 1 ) );
71    m_ucState   = ( m_aucNextStateLPS[ m_ucState >> 1 ] << 1 ) + ucMPS;
72  }
73 
74  Void        updateMPS ()
75  {
76    m_ucState   = ( m_aucNextStateMPS[ m_ucState >> 1 ] << 1 ) + ( m_ucState & 1 );
77  }
78 
79private:
80  UChar         m_ucState;                                                                  ///< internal state variable
81  static const  UChar m_aucNextStateMPS[ 64 ];
82  static const  UChar m_aucNextStateLPS[ 64 ];
83};
84
85#endif
86
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