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1 /* The copyright in this software is being made available under the BSD
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2 * License, included below. This software may be subject to other third party
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3 * and contributor rights, including patent rights, and no such rights are
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4 * granted under this license.
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5 *
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6 * Copyright (c) 2010-2014, ITU/ISO/IEC
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7 * All rights reserved.
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8 *
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions are met:
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11 *
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12 * * Redistributions of source code must retain the above copyright notice,
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13 * this list of conditions and the following disclaimer.
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14 * * Redistributions in binary form must reproduce the above copyright notice,
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15 * this list of conditions and the following disclaimer in the documentation
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16 * and/or other materials provided with the distribution.
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17 * * Neither the name of the ITU/ISO/IEC nor the names of its contributors may
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18 * be used to endorse or promote products derived from this software without
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19 * specific prior written permission.
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20 *
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21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS
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25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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31 * THE POSSIBILITY OF SUCH DAMAGE.
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32 */
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33
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34
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35 /** \file ContextModel.h
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36 \brief context model class (header)
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37 */
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38
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39 #ifndef __CONTEXTMODEL__
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40 #define __CONTEXTMODEL__
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41
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42 #if _MSC_VER > 1000
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43 #pragma once
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44 #endif // _MSC_VER > 1000
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45
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46 #include "CommonDef.h"
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47 #include "TComRom.h"
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48
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49 //! \ingroup TLibCommon
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50 //! \{
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51
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52 // ====================================================================================================================
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53 // Class definition
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54 // ====================================================================================================================
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55
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56 /// context model class
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57 class ContextModel
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58 {
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59 public:
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60 ContextModel () { m_ucState = 0; m_binsCoded = 0; }
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61 ~ContextModel () {}
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62
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63 UChar getState () { return ( m_ucState >> 1 ); } ///< get current state
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64 UChar getMps () { return ( m_ucState & 1 ); } ///< get curret MPS
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65 Void setStateAndMps( UChar ucState, UChar ucMPS) { m_ucState = (ucState << 1) + ucMPS; } ///< set state and MPS
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66
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67 Void init ( Int qp, Int initValue ); ///< initialize state with initial probability
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68
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69 Void updateLPS ()
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70 {
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71 m_ucState = m_aucNextStateLPS[ m_ucState ];
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72 }
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73
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74 Void updateMPS ()
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75 {
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76 m_ucState = m_aucNextStateMPS[ m_ucState ];
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77 }
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78
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79 Int getEntropyBits(Short val) { return m_entropyBits[m_ucState ^ val]; }
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80
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81 #if FAST_BIT_EST
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82 Void update( Int binVal )
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83 {
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84 m_ucState = m_nextState[m_ucState][binVal];
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85 }
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86 static Void buildNextStateTable();
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87 static Int getEntropyBitsTrm( Int val ) { return m_entropyBits[126 ^ val]; }
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88 #endif
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89 Void setBinsCoded(UInt val) { m_binsCoded = val; }
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90 UInt getBinsCoded() { return m_binsCoded; }
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91
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92 private:
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93 UChar m_ucState; ///< internal state variable
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94
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95 static const UInt m_totalStates = (1 << CONTEXT_STATE_BITS) * 2; //*2 for MPS = [0|1]
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96 static const UChar m_aucNextStateMPS[m_totalStates];
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97 static const UChar m_aucNextStateLPS[m_totalStates];
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98 static const Int m_entropyBits [m_totalStates];
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99 #if FAST_BIT_EST
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100 static UChar m_nextState[m_totalStates][2 /*MPS = [0|1]*/];
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101 #endif
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102 UInt m_binsCoded;
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103 };
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104
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105 //! \}
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106
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107 #endif
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108
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