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) 2010-2015, 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 | /** \file TDecSlice.cpp |
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35 | \brief slice decoder class |
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36 | */ |
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37 | |
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38 | #include "TDecSlice.h" |
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39 | |
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40 | //! \ingroup TLibDecoder |
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41 | //! \{ |
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42 | |
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43 | ////////////////////////////////////////////////////////////////////// |
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44 | // Construction/Destruction |
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45 | ////////////////////////////////////////////////////////////////////// |
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46 | |
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47 | TDecSlice::TDecSlice() |
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48 | { |
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49 | } |
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50 | |
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51 | TDecSlice::~TDecSlice() |
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52 | { |
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53 | } |
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54 | |
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55 | Void TDecSlice::create() |
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56 | { |
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57 | } |
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58 | |
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59 | Void TDecSlice::destroy() |
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60 | { |
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61 | } |
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62 | |
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63 | #if SVC_EXTENSION |
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64 | Void TDecSlice::init(TDecEntropy* pcEntropyDecoder, TDecCu* pcCuDecoder, UInt* saoMaxOffsetQVal) |
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65 | { |
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66 | m_pcEntropyDecoder = pcEntropyDecoder; |
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67 | m_pcCuDecoder = pcCuDecoder; |
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68 | m_saoMaxOffsetQVal = saoMaxOffsetQVal; |
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69 | } |
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70 | #else |
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71 | Void TDecSlice::init(TDecEntropy* pcEntropyDecoder, TDecCu* pcCuDecoder) |
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72 | { |
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73 | m_pcEntropyDecoder = pcEntropyDecoder; |
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74 | m_pcCuDecoder = pcCuDecoder; |
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75 | } |
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76 | #endif |
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77 | |
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78 | Void TDecSlice::decompressSlice(TComInputBitstream** ppcSubstreams, TComPic* pcPic, TDecSbac* pcSbacDecoder) |
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79 | { |
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80 | TComSlice* pcSlice = pcPic->getSlice(pcPic->getCurrSliceIdx()); |
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81 | |
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82 | const Int startCtuTsAddr = pcSlice->getSliceSegmentCurStartCtuTsAddr(); |
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83 | const Int startCtuRsAddr = pcPic->getPicSym()->getCtuTsToRsAddrMap(startCtuTsAddr); |
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84 | const UInt numCtusInFrame = pcPic->getNumberOfCtusInFrame(); |
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85 | |
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86 | const UInt frameWidthInCtus = pcPic->getPicSym()->getFrameWidthInCtus(); |
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87 | const Bool depSliceSegmentsEnabled = pcSlice->getPPS()->getDependentSliceSegmentsEnabledFlag(); |
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88 | const Bool wavefrontsEnabled = pcSlice->getPPS()->getEntropyCodingSyncEnabledFlag(); |
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89 | |
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90 | m_pcEntropyDecoder->setEntropyDecoder ( pcSbacDecoder ); |
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91 | m_pcEntropyDecoder->setBitstream ( ppcSubstreams[0] ); |
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92 | m_pcEntropyDecoder->resetEntropy (pcSlice); |
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93 | |
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94 | // decoder doesn't need prediction & residual frame buffer |
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95 | pcPic->setPicYuvPred( 0 ); |
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96 | pcPic->setPicYuvResi( 0 ); |
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97 | |
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98 | #if ENC_DEC_TRACE |
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99 | g_bJustDoIt = g_bEncDecTraceEnable; |
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100 | #endif |
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101 | DTRACE_CABAC_VL( g_nSymbolCounter++ ); |
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102 | DTRACE_CABAC_T( "\tPOC: " ); |
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103 | DTRACE_CABAC_V( pcPic->getPOC() ); |
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104 | DTRACE_CABAC_T( "\n" ); |
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105 | |
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106 | #if ENC_DEC_TRACE |
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107 | g_bJustDoIt = g_bEncDecTraceDisable; |
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108 | #endif |
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109 | |
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110 | // The first CTU of the slice is the first coded substream, but the global substream number, as calculated by getSubstreamForCtuAddr may be higher. |
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111 | // This calculates the common offset for all substreams in this slice. |
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112 | const UInt subStreamOffset=pcPic->getSubstreamForCtuAddr(startCtuRsAddr, true, pcSlice); |
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113 | |
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114 | |
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115 | if (depSliceSegmentsEnabled) |
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116 | { |
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117 | // modify initial contexts with previous slice segment if this is a dependent slice. |
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118 | const UInt startTileIdx=pcPic->getPicSym()->getTileIdxMap(startCtuRsAddr); |
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119 | const TComTile *pCurrentTile=pcPic->getPicSym()->getTComTile(startTileIdx); |
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120 | const UInt firstCtuRsAddrOfTile = pCurrentTile->getFirstCtuRsAddr(); |
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121 | |
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122 | if( pcSlice->getDependentSliceSegmentFlag() && startCtuRsAddr != firstCtuRsAddrOfTile) |
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123 | { |
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124 | if ( pCurrentTile->getTileWidthInCtus() >= 2 || !wavefrontsEnabled) |
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125 | { |
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126 | pcSbacDecoder->loadContexts(&m_lastSliceSegmentEndContextState); |
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127 | } |
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128 | } |
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129 | } |
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130 | |
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131 | // for every CTU in the slice segment... |
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132 | |
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133 | Bool isLastCtuOfSliceSegment = false; |
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134 | for( UInt ctuTsAddr = startCtuTsAddr; !isLastCtuOfSliceSegment && ctuTsAddr < numCtusInFrame; ctuTsAddr++) |
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135 | { |
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136 | const UInt ctuRsAddr = pcPic->getPicSym()->getCtuTsToRsAddrMap(ctuTsAddr); |
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137 | const TComTile ¤tTile = *(pcPic->getPicSym()->getTComTile(pcPic->getPicSym()->getTileIdxMap(ctuRsAddr))); |
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138 | const UInt firstCtuRsAddrOfTile = currentTile.getFirstCtuRsAddr(); |
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139 | const UInt tileXPosInCtus = firstCtuRsAddrOfTile % frameWidthInCtus; |
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140 | const UInt tileYPosInCtus = firstCtuRsAddrOfTile / frameWidthInCtus; |
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141 | const UInt ctuXPosInCtus = ctuRsAddr % frameWidthInCtus; |
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142 | const UInt ctuYPosInCtus = ctuRsAddr / frameWidthInCtus; |
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143 | const UInt uiSubStrm=pcPic->getSubstreamForCtuAddr(ctuRsAddr, true, pcSlice)-subStreamOffset; |
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144 | TComDataCU* pCtu = pcPic->getCtu( ctuRsAddr ); |
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145 | pCtu->initCtu( pcPic, ctuRsAddr ); |
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146 | |
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147 | m_pcEntropyDecoder->setBitstream( ppcSubstreams[uiSubStrm] ); |
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148 | |
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149 | // set up CABAC contexts' state for this CTU |
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150 | if (ctuRsAddr == firstCtuRsAddrOfTile) |
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151 | { |
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152 | if (ctuTsAddr != startCtuTsAddr) // if it is the first CTU, then the entropy coder has already been reset |
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153 | { |
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154 | m_pcEntropyDecoder->resetEntropy(pcSlice); |
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155 | } |
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156 | } |
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157 | else if (ctuXPosInCtus == tileXPosInCtus && wavefrontsEnabled) |
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158 | { |
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159 | // Synchronize cabac probabilities with upper-right CTU if it's available and at the start of a line. |
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160 | if (ctuTsAddr != startCtuTsAddr) // if it is the first CTU, then the entropy coder has already been reset |
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161 | { |
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162 | m_pcEntropyDecoder->resetEntropy(pcSlice); |
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163 | } |
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164 | TComDataCU *pCtuUp = pCtu->getCtuAbove(); |
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165 | if ( pCtuUp && ((ctuRsAddr%frameWidthInCtus+1) < frameWidthInCtus) ) |
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166 | { |
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167 | TComDataCU *pCtuTR = pcPic->getCtu( ctuRsAddr - frameWidthInCtus + 1 ); |
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168 | if ( pCtu->CUIsFromSameSliceAndTile(pCtuTR) ) |
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169 | { |
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170 | // Top-right is available, so use it. |
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171 | pcSbacDecoder->loadContexts( &m_entropyCodingSyncContextState ); |
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172 | } |
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173 | } |
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174 | } |
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175 | |
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176 | #if ENC_DEC_TRACE |
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177 | g_bJustDoIt = g_bEncDecTraceEnable; |
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178 | #endif |
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179 | |
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180 | if ( pcSlice->getSPS()->getUseSAO() ) |
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181 | { |
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182 | SAOBlkParam& saoblkParam = (pcPic->getPicSym()->getSAOBlkParam())[ctuRsAddr]; |
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183 | Bool bIsSAOSliceEnabled = false; |
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184 | Bool sliceEnabled[MAX_NUM_COMPONENT]; |
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185 | for(Int comp=0; comp < MAX_NUM_COMPONENT; comp++) |
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186 | { |
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187 | ComponentID compId=ComponentID(comp); |
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188 | sliceEnabled[compId] = pcSlice->getSaoEnabledFlag(toChannelType(compId)) && (comp < pcPic->getNumberValidComponents()); |
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189 | if (sliceEnabled[compId]) |
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190 | { |
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191 | bIsSAOSliceEnabled=true; |
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192 | } |
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193 | saoblkParam[compId].modeIdc = SAO_MODE_OFF; |
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194 | } |
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195 | if (bIsSAOSliceEnabled) |
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196 | { |
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197 | Bool leftMergeAvail = false; |
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198 | Bool aboveMergeAvail= false; |
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199 | |
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200 | //merge left condition |
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201 | Int rx = (ctuRsAddr % frameWidthInCtus); |
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202 | if(rx > 0) |
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203 | { |
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204 | leftMergeAvail = pcPic->getSAOMergeAvailability(ctuRsAddr, ctuRsAddr-1); |
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205 | } |
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206 | //merge up condition |
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207 | Int ry = (ctuRsAddr / frameWidthInCtus); |
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208 | if(ry > 0) |
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209 | { |
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210 | aboveMergeAvail = pcPic->getSAOMergeAvailability(ctuRsAddr, ctuRsAddr-frameWidthInCtus); |
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211 | } |
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212 | #if SVC_EXTENSION |
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213 | pcSbacDecoder->parseSAOBlkParam( saoblkParam, m_saoMaxOffsetQVal, sliceEnabled, leftMergeAvail, aboveMergeAvail); |
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214 | #else |
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215 | pcSbacDecoder->parseSAOBlkParam( saoblkParam, sliceEnabled, leftMergeAvail, aboveMergeAvail); |
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216 | #endif |
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217 | } |
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218 | } |
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219 | |
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220 | m_pcCuDecoder->decodeCtu ( pCtu, isLastCtuOfSliceSegment ); |
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221 | m_pcCuDecoder->decompressCtu ( pCtu ); |
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222 | |
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223 | #if ENC_DEC_TRACE |
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224 | g_bJustDoIt = g_bEncDecTraceDisable; |
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225 | #endif |
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226 | |
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227 | //Store probabilities of second CTU in line into buffer |
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228 | if ( ctuXPosInCtus == tileXPosInCtus+1 && wavefrontsEnabled) |
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229 | { |
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230 | m_entropyCodingSyncContextState.loadContexts( pcSbacDecoder ); |
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231 | } |
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232 | |
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233 | if (isLastCtuOfSliceSegment) |
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234 | { |
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235 | #if DECODER_CHECK_SUBSTREAM_AND_SLICE_TRAILING_BYTES |
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236 | pcSbacDecoder->parseRemainingBytes(false); |
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237 | #endif |
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238 | if(!pcSlice->getDependentSliceSegmentFlag()) |
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239 | { |
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240 | pcSlice->setSliceCurEndCtuTsAddr( ctuTsAddr+1 ); |
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241 | } |
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242 | pcSlice->setSliceSegmentCurEndCtuTsAddr( ctuTsAddr+1 ); |
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243 | } |
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244 | else if ( ctuXPosInCtus + 1 == tileXPosInCtus + currentTile.getTileWidthInCtus() && |
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245 | ( ctuYPosInCtus + 1 == tileYPosInCtus + currentTile.getTileHeightInCtus() || wavefrontsEnabled) |
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246 | ) |
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247 | { |
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248 | // The sub-stream/stream should be terminated after this CTU. |
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249 | // (end of slice-segment, end of tile, end of wavefront-CTU-row) |
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250 | UInt binVal; |
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251 | pcSbacDecoder->parseTerminatingBit( binVal ); |
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252 | assert( binVal ); |
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253 | #if DECODER_CHECK_SUBSTREAM_AND_SLICE_TRAILING_BYTES |
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254 | pcSbacDecoder->parseRemainingBytes(true); |
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255 | #endif |
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256 | } |
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257 | |
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258 | } |
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259 | |
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260 | assert(isLastCtuOfSliceSegment == true); |
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261 | |
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262 | |
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263 | if( depSliceSegmentsEnabled ) |
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264 | { |
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265 | m_lastSliceSegmentEndContextState.loadContexts( pcSbacDecoder );//ctx end of dep.slice |
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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 | //! \} |
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