source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.cpp @ 21

Last change on this file since 21 was 5, checked in by hhi, 13 years ago

Clean version with cfg-files

  • Property svn:eol-style set to native
File size: 3.2 KB
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1/* The copyright in this software is being made available under the BSD
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4 * granted under this license.
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31 * THE POSSIBILITY OF SUCH DAMAGE.
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33
34
35
36/** \file     ContextModel.cpp
37    \brief    context model class
38*/
39
40#include "ContextModel.h"
41
42// ====================================================================================================================
43// Public member functions
44// ====================================================================================================================
45
46/**
47 - initialize context model with respect to QP and initial probability
48 .
49 \param  iQp         input QP value
50 \param  asCtxInit   initial probability table
51 */
52Void
53ContextModel::init( Int iQp, Short asCtxInit[] )
54{
55  Int iInitState  = ( ( asCtxInit[ 0 ] * iQp ) >> 4 ) + asCtxInit[ 1 ];
56  iInitState      = Min( Max( 1, iInitState ), 126 );
57  if( iInitState >= 64 )
58  {
59    m_ucState     = Min( 62, iInitState - 64 );
60    m_ucState    += m_ucState + 1;
61  }
62  else
63  {
64    m_ucState     = Min( 62, 63 - iInitState );
65    m_ucState    += m_ucState;
66  }
67}
68
69
70const UChar
71ContextModel::m_aucNextStateMPS[ 64 ] =
72{
73  1, 2, 3, 4, 5, 6, 7, 8,   
74  9, 10,11,12,13,14,15,16, 
75  17,18,19,20,21,22,23,24,
76  25,26,27,28,29,30,31,32, 
77  33,34,35,36,37,38,39,40, 
78  41,42,43,44,45,46,47,48,
79  49,50,51,52,53,54,55,56, 
80  57,58,59,60,61,62,62,63
81};
82
83const UChar
84ContextModel::m_aucNextStateLPS[ 64 ] =
85{
86  0, 0, 1, 2, 2, 4, 4, 5,   
87  6, 7, 8, 9, 9, 11,11,12, 
88  13,13,15,15,16,16,18,18,
89  19,19,21,21,22,22,23,24, 
90  24,25,26,26,27,27,28,29, 
91  29,30,30,30,31,32,32,33,
92  33,33,34,34,35,35,35,36, 
93  36,36,37,37,37,38,38,63
94};
95
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