HEVC Test Model (HM)  HM-16.3
ContextModel3DBuffer.cpp
Go to the documentation of this file.
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) 2010-2015, 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 
38 #include "ContextModel3DBuffer.h"
39 
42 
43 // ====================================================================================================================
44 // Constructor / destructor / initialization / destroy
45 // ====================================================================================================================
46 
47 ContextModel3DBuffer::ContextModel3DBuffer( UInt uiSizeZ, UInt uiSizeY, UInt uiSizeX, ContextModel *basePtr, Int &count )
48 : m_sizeX ( uiSizeX )
49 , m_sizeXY ( uiSizeX * uiSizeY )
50 , m_sizeXYZ( uiSizeX * uiSizeY * uiSizeZ )
51 {
52  // allocate 3D buffer
53  m_contextModel = basePtr;
54  count += m_sizeXYZ;
55 }
56 
57 // ====================================================================================================================
58 // Public member functions
59 // ====================================================================================================================
60 
69 {
70  ctxModel += sliceType * m_sizeXYZ;
71 
72  for ( Int n = 0; n < m_sizeXYZ; n++ )
73  {
74  m_contextModel[ n ].init( qp, ctxModel[ n ] );
75  m_contextModel[ n ].setBinsCoded( 0 );
76  }
77 }
78 
87 {
88  UInt cost = 0;
89  ctxModel += sliceType * m_sizeXYZ;
90 
91  for ( Int n = 0; n < m_sizeXYZ; n++ )
92  {
93  ContextModel tmpContextModel;
94  tmpContextModel.init( qp, ctxModel[ n ] );
95 
96  // Map the 64 CABAC states to their corresponding probability values
97  static Double aStateToProbLPS[] = {0.50000000, 0.47460857, 0.45050660, 0.42762859, 0.40591239, 0.38529900, 0.36573242, 0.34715948, 0.32952974, 0.31279528, 0.29691064, 0.28183267, 0.26752040, 0.25393496, 0.24103941, 0.22879875, 0.21717969, 0.20615069, 0.19568177, 0.18574449, 0.17631186, 0.16735824, 0.15885931, 0.15079198, 0.14313433, 0.13586556, 0.12896592, 0.12241667, 0.11620000, 0.11029903, 0.10469773, 0.09938088, 0.09433404, 0.08954349, 0.08499621, 0.08067986, 0.07658271, 0.07269362, 0.06900203, 0.06549791, 0.06217174, 0.05901448, 0.05601756, 0.05317283, 0.05047256, 0.04790942, 0.04547644, 0.04316702, 0.04097487, 0.03889405, 0.03691890, 0.03504406, 0.03326442, 0.03157516, 0.02997168, 0.02844963, 0.02700488, 0.02563349, 0.02433175, 0.02309612, 0.02192323, 0.02080991, 0.01975312, 0.01875000};
98 
99  Double probLPS = aStateToProbLPS[ m_contextModel[ n ].getState() ];
100  Double prob0, prob1;
101  if (m_contextModel[ n ].getMps()==1)
102  {
103  prob0 = probLPS;
104  prob1 = 1.0-prob0;
105  }
106  else
107  {
108  prob1 = probLPS;
109  prob0 = 1.0-prob1;
110  }
111 
112  if (m_contextModel[ n ].getBinsCoded()>0)
113  {
114  cost += (UInt) (prob0 * tmpContextModel.getEntropyBits( 0 ) + prob1 * tmpContextModel.getEntropyBits( 1 ));
115  }
116  }
117 
118  return cost;
119 }
Int getEntropyBits(Short val)
Definition: ContextModel.h:79
SliceType
supported slice type
Definition: TypeDef.h:343
void Void
Definition: TypeDef.h:285
const UInt m_sizeXYZ
total size of 3D buffer
unsigned int UInt
Definition: TypeDef.h:297
UChar getState()
get current state
Definition: ContextModel.h:63
context model class
Definition: ContextModel.h:57
UInt calcCost(SliceType sliceType, Int qp, UChar *ctxModel)
determine cost of choosing a probability table based on current probabilities
unsigned char UChar
Definition: TypeDef.h:293
Void setBinsCoded(UInt val)
Definition: ContextModel.h:89
ContextModel3DBuffer(UInt uiSizeZ, UInt uiSizeY, UInt uiSizeX, ContextModel *basePtr, Int &count)
ContextModel * m_contextModel
array of context models
int Int
Definition: TypeDef.h:296
context model 3D buffer class (header)
double Double
Definition: TypeDef.h:298
Void init(Int qp, Int initValue)
initialize state with initial probability
Void initBuffer(SliceType eSliceType, Int iQp, UChar *ctxModel)
initialize 3D buffer by slice type & QP