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comparison jctvc/TLibCommon/ContextModel.h @ 0:772086c29cc7

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Initial import.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 16 Nov 2016 11:16:33 +0200
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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) 2010-2014, 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.
17 * * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
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
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 __CONTEXTMODEL__
40 #define __CONTEXTMODEL__
41
42 #if _MSC_VER > 1000
43 #pragma once
44 #endif // _MSC_VER > 1000
45
46 #include "CommonDef.h"
47 #include "TComRom.h"
48
49 //! \ingroup TLibCommon
50 //! \{
51
52 // ====================================================================================================================
53 // Class definition
54 // ====================================================================================================================
55
56 /// context model class
57 class ContextModel
58 {
59 public:
60 ContextModel () { m_ucState = 0; m_binsCoded = 0; }
61 ~ContextModel () {}
62
63 UChar getState () { return ( m_ucState >> 1 ); } ///< get current state
64 UChar getMps () { return ( m_ucState & 1 ); } ///< get curret MPS
65 Void setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS
66
67 Void init ( Int qp, Int initValue ); ///< initialize state with initial probability
68
69 Void updateLPS ()
70 {
71 m_ucState = m_aucNextStateLPS[ m_ucState ];
72 }
73
74 Void updateMPS ()
75 {
76 m_ucState = m_aucNextStateMPS[ m_ucState ];
77 }
78
79 Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
80
81 #if FAST_BIT_EST
82 Void update( Int binVal )
83 {
84 m_ucState = m_nextState[m_ucState][binVal];
85 }
86 static Void buildNextStateTable();
87 static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
88 #endif
89 Void setBinsCoded(UInt val) { m_binsCoded = val; }
90 UInt getBinsCoded() { return m_binsCoded; }
91
92 private:
93 UChar m_ucState; ///< internal state variable
94
95 static const UInt m_totalStates = (1 << CONTEXT_STATE_BITS) * 2; //*2 for MPS = [0|1]
96 static const UChar m_aucNextStateMPS[m_totalStates];
97 static const UChar m_aucNextStateLPS[m_totalStates];
98 static const Int m_entropyBits [m_totalStates];
99 #if FAST_BIT_EST
100 static UChar m_nextState[m_totalStates][2 /*MPS = [0|1]*/];
101 #endif
102 UInt m_binsCoded;
103 };
104
105 //! \}
106
107 #endif
108