source: 3DVCSoftware/trunk/source/Lib/TLibCommon/ContextModel.cpp @ 56

Last change on this file since 56 was 56, checked in by hschwarz, 12 years ago

updated trunk (move to HM6.1)

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1/* The copyright in this software is being made available under the BSD
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33
34/** \file     ContextModel.cpp
35    \brief    context model class
36*/
37
38#include <algorithm>
39
40#include "ContextModel.h"
41
42using namespace std;
43//! \ingroup TLibCommon
44//! \{
45
46// ====================================================================================================================
47// Public member functions
48// ====================================================================================================================
49
50/**
51 - initialize context model with respect to QP and initialization value
52 .
53 \param  qp         input QP value
54 \param  initValue  8 bit initialization value
55 */
56Void ContextModel::init( Int qp, Int initValue )
57{
58#if H0736_AVC_STYLE_QP_RANGE
59  qp = Clip3(0, 51, qp);
60#endif
61
62#if CABAC_LINEAR_INIT
63  Int  slope      = (initValue>>4)*5 - 45;
64  Int  offset     = ((initValue&15)<<3)-16;
65  Int  initState  =  min( max( 1, ( ( ( slope * qp ) >> 4 ) + offset ) ), 126 );
66  UInt mpState    = (initState >= 64 );
67  m_ucState       = ( (mpState? (initState - 64):(63 - initState)) <<1) + mpState;
68#else
69  Int m = m_slopes[initValue>>4];
70  Int n = initValue & 15;
71 
72  Int val = max( 0, min( 3839, (n<<8) + m * (qp-26) + 128 ) );
73  val -= 1920;
74  Int valMps = val >= 0;
75  val = ( val ^ (val>>11) ) + 128;
76  Int segmentIdx = val >> 8;
77  Int pStateIdx = m_accumulatedSegOffset[segmentIdx] + ( (val&255) * m_segOffset[segmentIdx] >> 8);
78 
79  m_ucState = (pStateIdx<<1) + valMps;
80#endif
81}
82
83const UChar ContextModel::m_aucNextStateMPS[ 128 ] =
84{
85  2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
86  18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
87  34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
88  50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65,
89  66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81,
90  82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
91  98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
92  114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 124, 125, 126, 127
93};
94
95const UChar ContextModel::m_aucNextStateLPS[ 128 ] =
96{
97  1, 0, 0, 1, 2, 3, 4, 5, 4, 5, 8, 9, 8, 9, 10, 11,
98  12, 13, 14, 15, 16, 17, 18, 19, 18, 19, 22, 23, 22, 23, 24, 25,
99  26, 27, 26, 27, 30, 31, 30, 31, 32, 33, 32, 33, 36, 37, 36, 37,
100  38, 39, 38, 39, 42, 43, 42, 43, 44, 45, 44, 45, 46, 47, 48, 49,
101  48, 49, 50, 51, 52, 53, 52, 53, 54, 55, 54, 55, 56, 57, 58, 59,
102  58, 59, 60, 61, 60, 61, 60, 61, 62, 63, 64, 65, 64, 65, 66, 67,
103  66, 67, 66, 67, 68, 69, 68, 69, 70, 71, 70, 71, 70, 71, 72, 73,
104  72, 73, 72, 73, 74, 75, 74, 75, 74, 75, 76, 77, 76, 77, 126, 127
105};
106
107#if FAST_BIT_EST
108UChar ContextModel::m_nextState[128][2];
109
110Void ContextModel::buildNextStateTable()
111{
112  for (Int i = 0; i < 128; i++)
113  {
114    for (Int j = 0; j < 2; j++)
115    {
116      m_nextState[i][j] = ((i&1) == j) ? m_aucNextStateMPS[i] : m_aucNextStateLPS[i];
117    }
118  }
119}
120#endif
121
122const Int ContextModel::m_entropyBits[128] =
123{
124#if FAST_BIT_EST
125  // Corrected table, most notably for last state
126  0x07b23, 0x085f9, 0x074a0, 0x08cbc, 0x06ee4, 0x09354, 0x067f4, 0x09c1b, 0x060b0, 0x0a62a, 0x05a9c, 0x0af5b, 0x0548d, 0x0b955, 0x04f56, 0x0c2a9,
127  0x04a87, 0x0cbf7, 0x045d6, 0x0d5c3, 0x04144, 0x0e01b, 0x03d88, 0x0e937, 0x039e0, 0x0f2cd, 0x03663, 0x0fc9e, 0x03347, 0x10600, 0x03050, 0x10f95,
128  0x02d4d, 0x11a02, 0x02ad3, 0x12333, 0x0286e, 0x12cad, 0x02604, 0x136df, 0x02425, 0x13f48, 0x021f4, 0x149c4, 0x0203e, 0x1527b, 0x01e4d, 0x15d00,
129  0x01c99, 0x166de, 0x01b18, 0x17017, 0x019a5, 0x17988, 0x01841, 0x18327, 0x016df, 0x18d50, 0x015d9, 0x19547, 0x0147c, 0x1a083, 0x0138e, 0x1a8a3,
130  0x01251, 0x1b418, 0x01166, 0x1bd27, 0x01068, 0x1c77b, 0x00f7f, 0x1d18e, 0x00eda, 0x1d91a, 0x00e19, 0x1e254, 0x00d4f, 0x1ec9a, 0x00c90, 0x1f6e0,
131  0x00c01, 0x1fef8, 0x00b5f, 0x208b1, 0x00ab6, 0x21362, 0x00a15, 0x21e46, 0x00988, 0x2285d, 0x00934, 0x22ea8, 0x008a8, 0x239b2, 0x0081d, 0x24577,
132  0x007c9, 0x24ce6, 0x00763, 0x25663, 0x00710, 0x25e8f, 0x006a0, 0x26a26, 0x00672, 0x26f23, 0x005e8, 0x27ef8, 0x005ba, 0x284b5, 0x0055e, 0x29057,
133  0x0050c, 0x29bab, 0x004c1, 0x2a674, 0x004a7, 0x2aa5e, 0x0046f, 0x2b32f, 0x0041f, 0x2c0ad, 0x003e7, 0x2ca8d, 0x003ba, 0x2d323, 0x0010c, 0x3bfbb
134#else
135  0x08000, 0x08000, 0x076da, 0x089a0, 0x06e92, 0x09340, 0x0670a, 0x09cdf, 0x06029, 0x0a67f, 0x059dd, 0x0b01f, 0x05413, 0x0b9bf, 0x04ebf, 0x0c35f,
136  0x049d3, 0x0ccff, 0x04546, 0x0d69e, 0x0410d, 0x0e03e, 0x03d22, 0x0e9de, 0x0397d, 0x0f37e, 0x03619, 0x0fd1e, 0x032ee, 0x106be, 0x02ffa, 0x1105d,
137  0x02d37, 0x119fd, 0x02aa2, 0x1239d, 0x02836, 0x12d3d, 0x025f2, 0x136dd, 0x023d1, 0x1407c, 0x021d2, 0x14a1c, 0x01ff2, 0x153bc, 0x01e2f, 0x15d5c,
138  0x01c87, 0x166fc, 0x01af7, 0x1709b, 0x0197f, 0x17a3b, 0x0181d, 0x183db, 0x016d0, 0x18d7b, 0x01595, 0x1971b, 0x0146c, 0x1a0bb, 0x01354, 0x1aa5a,
139  0x0124c, 0x1b3fa, 0x01153, 0x1bd9a, 0x01067, 0x1c73a, 0x00f89, 0x1d0da, 0x00eb7, 0x1da79, 0x00df0, 0x1e419, 0x00d34, 0x1edb9, 0x00c82, 0x1f759,
140  0x00bda, 0x200f9, 0x00b3c, 0x20a99, 0x00aa5, 0x21438, 0x00a17, 0x21dd8, 0x00990, 0x22778, 0x00911, 0x23118, 0x00898, 0x23ab8, 0x00826, 0x24458,
141  0x007ba, 0x24df7, 0x00753, 0x25797, 0x006f2, 0x26137, 0x00696, 0x26ad7, 0x0063f, 0x27477, 0x005ed, 0x27e17, 0x0059f, 0x287b6, 0x00554, 0x29156,
142  0x0050e, 0x29af6, 0x004cc, 0x2a497, 0x0048d, 0x2ae35, 0x00451, 0x2b7d6, 0x00418, 0x2c176, 0x003e2, 0x2cb15, 0x003af, 0x2d4b5, 0x0037f, 0x2de55
143#endif
144};
145#if !CABAC_LINEAR_INIT
146const Int ContextModel::m_slopes[16] = { -239, -143, -85, -51, -31, -19, -11, 0, 11, 19, 31, 51, 85, 143, 239, 399 };
147const Int ContextModel::m_segOffset[8]            = {   6,  7,  5,  7, 10, 14, 16,  1 };
148const Int ContextModel::m_accumulatedSegOffset[8] = {  -3,  3, 10, 15, 22, 32, 46, 62 };
149#endif
150//! \}
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