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) 2010-2013, 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 |
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36 | * \brief Implementation of TComInterpolationFilter class |
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37 | */ |
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38 | |
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39 | // ==================================================================================================================== |
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40 | // Includes |
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41 | // ==================================================================================================================== |
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42 | |
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43 | #include "TComRom.h" |
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44 | #include "TComInterpolationFilter.h" |
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45 | #include <assert.h> |
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46 | |
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47 | |
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48 | //! \ingroup TLibCommon |
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49 | //! \{ |
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50 | |
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51 | // ==================================================================================================================== |
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52 | // Tables |
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53 | // ==================================================================================================================== |
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54 | |
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55 | const Short TComInterpolationFilter::m_lumaFilter[4][NTAPS_LUMA] = |
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56 | { |
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57 | { 0, 0, 0, 64, 0, 0, 0, 0 }, |
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58 | { -1, 4, -10, 58, 17, -5, 1, 0 }, |
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59 | { -1, 4, -11, 40, 40, -11, 4, -1 }, |
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60 | { 0, 1, -5, 17, 58, -10, 4, -1 } |
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61 | }; |
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62 | |
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63 | const Short TComInterpolationFilter::m_chromaFilter[8][NTAPS_CHROMA] = |
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64 | { |
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65 | { 0, 64, 0, 0 }, |
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66 | { -2, 58, 10, -2 }, |
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67 | { -4, 54, 16, -2 }, |
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68 | { -6, 46, 28, -4 }, |
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69 | { -4, 36, 36, -4 }, |
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70 | { -4, 28, 46, -6 }, |
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71 | { -2, 16, 54, -4 }, |
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72 | { -2, 10, 58, -2 } |
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73 | }; |
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74 | |
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75 | #if H_3D_ARP |
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76 | const Short TComInterpolationFilter::m_lumaFilterARP[4][NTAPS_LUMA_ARP] = |
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77 | { |
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78 | {64, 0}, |
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79 | {48, 16}, |
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80 | {32, 32}, |
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81 | {16, 48} |
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82 | }; |
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83 | const Short TComInterpolationFilter::m_chromaFilterARP[8][NTAPS_CHROMA_ARP] = |
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84 | { |
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85 | {64, 0}, |
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86 | {56, 8}, |
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87 | {48, 16}, |
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88 | {40, 24}, |
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89 | {32, 32}, |
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90 | {24, 40}, |
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91 | {16, 48}, |
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92 | {8, 56} |
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93 | }; |
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94 | #endif |
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95 | |
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96 | // ==================================================================================================================== |
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97 | // Private member functions |
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98 | // ==================================================================================================================== |
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99 | |
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100 | /** |
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101 | * \brief Apply unit FIR filter to a block of samples |
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102 | * |
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103 | * \param bitDepth bitDepth of samples |
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104 | * \param src Pointer to source samples |
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105 | * \param srcStride Stride of source samples |
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106 | * \param dst Pointer to destination samples |
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107 | * \param dstStride Stride of destination samples |
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108 | * \param width Width of block |
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109 | * \param height Height of block |
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110 | * \param isFirst Flag indicating whether it is the first filtering operation |
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111 | * \param isLast Flag indicating whether it is the last filtering operation |
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112 | */ |
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113 | Void TComInterpolationFilter::filterCopy(Int bitDepth, const Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Bool isFirst, Bool isLast) |
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114 | { |
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115 | Int row, col; |
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116 | |
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117 | if ( isFirst == isLast ) |
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118 | { |
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119 | for (row = 0; row < height; row++) |
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120 | { |
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121 | for (col = 0; col < width; col++) |
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122 | { |
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123 | dst[col] = src[col]; |
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124 | } |
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125 | |
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126 | src += srcStride; |
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127 | dst += dstStride; |
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128 | } |
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129 | } |
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130 | else if ( isFirst ) |
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131 | { |
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132 | Int shift = IF_INTERNAL_PREC - bitDepth; |
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133 | |
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134 | for (row = 0; row < height; row++) |
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135 | { |
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136 | for (col = 0; col < width; col++) |
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137 | { |
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138 | Short val = src[col] << shift; |
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139 | dst[col] = val - (Short)IF_INTERNAL_OFFS; |
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140 | } |
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141 | |
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142 | src += srcStride; |
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143 | dst += dstStride; |
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144 | } |
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145 | } |
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146 | else |
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147 | { |
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148 | Int shift = IF_INTERNAL_PREC - bitDepth; |
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149 | Short offset = IF_INTERNAL_OFFS; |
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150 | offset += shift?(1 << (shift - 1)):0; |
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151 | Short maxVal = (1 << bitDepth) - 1; |
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152 | Short minVal = 0; |
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153 | for (row = 0; row < height; row++) |
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154 | { |
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155 | for (col = 0; col < width; col++) |
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156 | { |
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157 | Short val = src[ col ]; |
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158 | val = ( val + offset ) >> shift; |
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159 | if (val < minVal) val = minVal; |
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160 | if (val > maxVal) val = maxVal; |
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161 | dst[col] = val; |
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162 | } |
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163 | |
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164 | src += srcStride; |
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165 | dst += dstStride; |
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166 | } |
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167 | } |
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168 | } |
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169 | |
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170 | /** |
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171 | * \brief Apply FIR filter to a block of samples |
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172 | * |
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173 | * \tparam N Number of taps |
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174 | * \tparam isVertical Flag indicating filtering along vertical direction |
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175 | * \tparam isFirst Flag indicating whether it is the first filtering operation |
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176 | * \tparam isLast Flag indicating whether it is the last filtering operation |
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177 | * \param bitDepth Bit depth of samples |
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178 | * \param src Pointer to source samples |
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179 | * \param srcStride Stride of source samples |
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180 | * \param dst Pointer to destination samples |
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181 | * \param dstStride Stride of destination samples |
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182 | * \param width Width of block |
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183 | * \param height Height of block |
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184 | * \param coeff Pointer to filter taps |
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185 | */ |
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186 | template<Int N, Bool isVertical, Bool isFirst, Bool isLast> |
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187 | Void TComInterpolationFilter::filter(Int bitDepth, Short const *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Short const *coeff) |
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188 | { |
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189 | Int row, col; |
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190 | |
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191 | Short c[8]; |
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192 | c[0] = coeff[0]; |
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193 | c[1] = coeff[1]; |
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194 | if ( N >= 4 ) |
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195 | { |
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196 | c[2] = coeff[2]; |
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197 | c[3] = coeff[3]; |
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198 | } |
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199 | if ( N >= 6 ) |
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200 | { |
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201 | c[4] = coeff[4]; |
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202 | c[5] = coeff[5]; |
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203 | } |
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204 | if ( N == 8 ) |
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205 | { |
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206 | c[6] = coeff[6]; |
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207 | c[7] = coeff[7]; |
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208 | } |
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209 | |
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210 | Int cStride = ( isVertical ) ? srcStride : 1; |
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211 | src -= ( N/2 - 1 ) * cStride; |
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212 | |
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213 | Int offset; |
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214 | Short maxVal; |
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215 | Int headRoom = IF_INTERNAL_PREC - bitDepth; |
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216 | Int shift = IF_FILTER_PREC; |
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217 | if ( isLast ) |
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218 | { |
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219 | shift += (isFirst) ? 0 : headRoom; |
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220 | offset = 1 << (shift - 1); |
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221 | offset += (isFirst) ? 0 : IF_INTERNAL_OFFS << IF_FILTER_PREC; |
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222 | maxVal = (1 << bitDepth) - 1; |
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223 | } |
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224 | else |
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225 | { |
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226 | shift -= (isFirst) ? headRoom : 0; |
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227 | offset = (isFirst) ? -IF_INTERNAL_OFFS << shift : 0; |
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228 | maxVal = 0; |
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229 | } |
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230 | |
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231 | for (row = 0; row < height; row++) |
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232 | { |
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233 | for (col = 0; col < width; col++) |
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234 | { |
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235 | Int sum; |
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236 | |
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237 | sum = src[ col + 0 * cStride] * c[0]; |
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238 | sum += src[ col + 1 * cStride] * c[1]; |
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239 | if ( N >= 4 ) |
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240 | { |
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241 | sum += src[ col + 2 * cStride] * c[2]; |
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242 | sum += src[ col + 3 * cStride] * c[3]; |
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243 | } |
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244 | if ( N >= 6 ) |
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245 | { |
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246 | sum += src[ col + 4 * cStride] * c[4]; |
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247 | sum += src[ col + 5 * cStride] * c[5]; |
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248 | } |
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249 | if ( N == 8 ) |
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250 | { |
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251 | sum += src[ col + 6 * cStride] * c[6]; |
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252 | sum += src[ col + 7 * cStride] * c[7]; |
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253 | } |
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254 | |
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255 | Short val = ( sum + offset ) >> shift; |
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256 | if ( isLast ) |
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257 | { |
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258 | val = ( val < 0 ) ? 0 : val; |
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259 | val = ( val > maxVal ) ? maxVal : val; |
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260 | } |
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261 | dst[col] = val; |
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262 | } |
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263 | |
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264 | src += srcStride; |
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265 | dst += dstStride; |
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266 | } |
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267 | } |
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268 | |
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269 | /** |
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270 | * \brief Filter a block of samples (horizontal) |
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271 | * |
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272 | * \tparam N Number of taps |
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273 | * \param bitDepth Bit depth of samples |
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274 | * \param src Pointer to source samples |
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275 | * \param srcStride Stride of source samples |
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276 | * \param dst Pointer to destination samples |
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277 | * \param dstStride Stride of destination samples |
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278 | * \param width Width of block |
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279 | * \param height Height of block |
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280 | * \param isLast Flag indicating whether it is the last filtering operation |
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281 | * \param coeff Pointer to filter taps |
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282 | */ |
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283 | template<Int N> |
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284 | Void TComInterpolationFilter::filterHor(Int bitDepth, Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Bool isLast, Short const *coeff) |
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285 | { |
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286 | if ( isLast ) |
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287 | { |
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288 | filter<N, false, true, true>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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289 | } |
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290 | else |
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291 | { |
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292 | filter<N, false, true, false>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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293 | } |
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294 | } |
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295 | |
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296 | /** |
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297 | * \brief Filter a block of samples (vertical) |
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298 | * |
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299 | * \tparam N Number of taps |
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300 | * \param bitDpeth Sample bit depth |
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301 | * \param src Pointer to source samples |
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302 | * \param srcStride Stride of source samples |
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303 | * \param dst Pointer to destination samples |
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304 | * \param dstStride Stride of destination samples |
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305 | * \param width Width of block |
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306 | * \param height Height of block |
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307 | * \param isFirst Flag indicating whether it is the first filtering operation |
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308 | * \param isLast Flag indicating whether it is the last filtering operation |
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309 | * \param coeff Pointer to filter taps |
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310 | */ |
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311 | template<Int N> |
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312 | Void TComInterpolationFilter::filterVer(Int bitDepth, Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Bool isFirst, Bool isLast, Short const *coeff) |
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313 | { |
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314 | if ( isFirst && isLast ) |
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315 | { |
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316 | filter<N, true, true, true>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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317 | } |
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318 | else if ( isFirst && !isLast ) |
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319 | { |
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320 | filter<N, true, true, false>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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321 | } |
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322 | else if ( !isFirst && isLast ) |
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323 | { |
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324 | filter<N, true, false, true>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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325 | } |
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326 | else |
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327 | { |
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328 | filter<N, true, false, false>(bitDepth, src, srcStride, dst, dstStride, width, height, coeff); |
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329 | } |
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330 | } |
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331 | |
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332 | // ==================================================================================================================== |
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333 | // Public member functions |
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334 | // ==================================================================================================================== |
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335 | |
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336 | /** |
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337 | * \brief Filter a block of luma samples (horizontal) |
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338 | * |
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339 | * \param src Pointer to source samples |
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340 | * \param srcStride Stride of source samples |
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341 | * \param dst Pointer to destination samples |
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342 | * \param dstStride Stride of destination samples |
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343 | * \param width Width of block |
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344 | * \param height Height of block |
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345 | * \param frac Fractional sample offset |
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346 | * \param isLast Flag indicating whether it is the last filtering operation |
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347 | */ |
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348 | Void TComInterpolationFilter::filterHorLuma(Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Int frac, Bool isLast |
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349 | #if H_3D_ARP |
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350 | , Bool filterType |
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351 | #endif |
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352 | ) |
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353 | { |
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354 | assert(frac >= 0 && frac < 4); |
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355 | |
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356 | if ( frac == 0 ) |
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357 | { |
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358 | filterCopy(g_bitDepthY, src, srcStride, dst, dstStride, width, height, true, isLast ); |
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359 | } |
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360 | else |
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361 | { |
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362 | #if H_3D_ARP |
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363 | if(filterType) |
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364 | { |
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365 | filterHor<NTAPS_LUMA_ARP>(g_bitDepthY, src, srcStride, dst, dstStride, width, height, isLast, m_lumaFilterARP[frac]); |
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366 | } |
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367 | else |
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368 | { |
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369 | #endif |
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370 | filterHor<NTAPS_LUMA>(g_bitDepthY, src, srcStride, dst, dstStride, width, height, isLast, m_lumaFilter[frac]); |
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371 | #if H_3D_ARP |
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372 | } |
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373 | #endif |
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374 | } |
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375 | } |
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376 | |
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377 | /** |
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378 | * \brief Filter a block of luma samples (vertical) |
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379 | * |
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380 | * \param src Pointer to source samples |
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381 | * \param srcStride Stride of source samples |
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382 | * \param dst Pointer to destination samples |
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383 | * \param dstStride Stride of destination samples |
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384 | * \param width Width of block |
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385 | * \param height Height of block |
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386 | * \param frac Fractional sample offset |
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387 | * \param isFirst Flag indicating whether it is the first filtering operation |
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388 | * \param isLast Flag indicating whether it is the last filtering operation |
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389 | */ |
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390 | Void TComInterpolationFilter::filterVerLuma(Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Int frac, Bool isFirst, Bool isLast |
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391 | #if H_3D_ARP |
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392 | , Bool filterType |
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393 | #endif |
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394 | ) |
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395 | { |
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396 | assert(frac >= 0 && frac < 4); |
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397 | |
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398 | if ( frac == 0 ) |
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399 | { |
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400 | filterCopy(g_bitDepthY, src, srcStride, dst, dstStride, width, height, isFirst, isLast ); |
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401 | } |
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402 | else |
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403 | { |
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404 | #if H_3D_ARP |
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405 | if(filterType) |
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406 | { |
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407 | filterVer<NTAPS_LUMA_ARP>(g_bitDepthY, src, srcStride, dst, dstStride, width, height, isFirst, isLast, m_lumaFilterARP[frac]); |
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408 | } |
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409 | else |
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410 | { |
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411 | #endif |
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412 | filterVer<NTAPS_LUMA>(g_bitDepthY, src, srcStride, dst, dstStride, width, height, isFirst, isLast, m_lumaFilter[frac]); |
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413 | #if H_3D_ARP |
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414 | } |
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415 | #endif |
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416 | } |
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417 | } |
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418 | |
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419 | /** |
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420 | * \brief Filter a block of chroma samples (horizontal) |
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421 | * |
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422 | * \param src Pointer to source samples |
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423 | * \param srcStride Stride of source samples |
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424 | * \param dst Pointer to destination samples |
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425 | * \param dstStride Stride of destination samples |
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426 | * \param width Width of block |
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427 | * \param height Height of block |
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428 | * \param frac Fractional sample offset |
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429 | * \param isLast Flag indicating whether it is the last filtering operation |
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430 | */ |
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431 | Void TComInterpolationFilter::filterHorChroma(Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Int frac, Bool isLast |
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432 | #if H_3D_ARP |
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433 | , Bool filterType |
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434 | #endif |
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435 | ) |
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436 | { |
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437 | assert(frac >= 0 && frac < 8); |
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438 | |
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439 | if ( frac == 0 ) |
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440 | { |
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441 | filterCopy(g_bitDepthC, src, srcStride, dst, dstStride, width, height, true, isLast ); |
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442 | } |
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443 | else |
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444 | { |
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445 | #if H_3D_ARP |
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446 | if(filterType) |
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447 | { |
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448 | filterHor<NTAPS_CHROMA_ARP>(g_bitDepthC, src, srcStride, dst, dstStride, width, height, isLast, m_chromaFilterARP[frac]); |
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449 | } |
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450 | else |
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451 | { |
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452 | #endif |
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453 | filterHor<NTAPS_CHROMA>(g_bitDepthC, src, srcStride, dst, dstStride, width, height, isLast, m_chromaFilter[frac]); |
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454 | #if H_3D_ARP |
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455 | } |
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456 | #endif |
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457 | } |
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458 | } |
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459 | |
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460 | /** |
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461 | * \brief Filter a block of chroma samples (vertical) |
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462 | * |
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463 | * \param src Pointer to source samples |
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464 | * \param srcStride Stride of source samples |
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465 | * \param dst Pointer to destination samples |
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466 | * \param dstStride Stride of destination samples |
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467 | * \param width Width of block |
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468 | * \param height Height of block |
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469 | * \param frac Fractional sample offset |
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470 | * \param isFirst Flag indicating whether it is the first filtering operation |
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471 | * \param isLast Flag indicating whether it is the last filtering operation |
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472 | */ |
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473 | Void TComInterpolationFilter::filterVerChroma(Pel *src, Int srcStride, Short *dst, Int dstStride, Int width, Int height, Int frac, Bool isFirst, Bool isLast |
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474 | #if H_3D_ARP |
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475 | , Bool filterType |
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476 | #endif |
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477 | ) |
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478 | { |
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479 | assert(frac >= 0 && frac < 8); |
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480 | |
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481 | if ( frac == 0 ) |
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482 | { |
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483 | filterCopy(g_bitDepthC, src, srcStride, dst, dstStride, width, height, isFirst, isLast ); |
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484 | } |
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485 | else |
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486 | { |
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487 | #if H_3D_ARP |
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488 | if(filterType) |
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489 | { |
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490 | filterVer<NTAPS_CHROMA_ARP>(g_bitDepthC, src, srcStride, dst, dstStride, width, height, isFirst, isLast, m_chromaFilterARP[frac]); |
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491 | } |
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492 | else |
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493 | { |
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494 | #endif |
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495 | filterVer<NTAPS_CHROMA>(g_bitDepthC, src, srcStride, dst, dstStride, width, height, isFirst, isLast, m_chromaFilter[frac]); |
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496 | #if H_3D_ARP |
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497 | } |
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498 | #endif |
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499 | } |
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500 | } |
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501 | |
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502 | //! \} |
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