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 | /** |
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35 | \file NALread.cpp |
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36 | \brief reading funtionality for NAL units |
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37 | */ |
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38 | |
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39 | |
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40 | #include <vector> |
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41 | #include <algorithm> |
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42 | #include <ostream> |
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43 | |
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44 | #include "NALread.h" |
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45 | #include "TLibCommon/NAL.h" |
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46 | #include "TLibCommon/TComBitStream.h" |
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47 | |
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48 | using namespace std; |
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49 | |
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50 | //! \ingroup TLibDecoder |
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51 | //! \{ |
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52 | static void convertPayloadToRBSP(vector<uint8_t>& nalUnitBuf, TComInputBitstream *bitstream, Bool isVclNalUnit) |
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53 | { |
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54 | UInt zeroCount = 0; |
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55 | vector<uint8_t>::iterator it_read, it_write; |
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56 | |
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57 | UInt pos = 0; |
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58 | bitstream->clearEmulationPreventionByteLocation(); |
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59 | for (it_read = it_write = nalUnitBuf.begin(); it_read != nalUnitBuf.end(); it_read++, it_write++, pos++) |
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60 | { |
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61 | assert(zeroCount < 2 || *it_read >= 0x03); |
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62 | if (zeroCount == 2 && *it_read == 0x03) |
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63 | { |
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64 | bitstream->pushEmulationPreventionByteLocation( pos ); |
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65 | pos++; |
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66 | it_read++; |
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67 | zeroCount = 0; |
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68 | if (it_read == nalUnitBuf.end()) |
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69 | { |
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70 | break; |
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71 | } |
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72 | assert(*it_read <= 0x03); |
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73 | } |
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74 | zeroCount = (*it_read == 0x00) ? zeroCount+1 : 0; |
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75 | *it_write = *it_read; |
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76 | } |
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77 | assert(zeroCount == 0); |
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78 | |
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79 | if (isVclNalUnit) |
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80 | { |
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81 | // Remove cabac_zero_word from payload if present |
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82 | Int n = 0; |
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83 | |
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84 | while (it_write[-1] == 0x00) |
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85 | { |
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86 | it_write--; |
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87 | n++; |
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88 | } |
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89 | |
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90 | if (n > 0) |
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91 | { |
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92 | printf("\nDetected %d instances of cabac_zero_word", n/2); |
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93 | } |
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94 | } |
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95 | |
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96 | nalUnitBuf.resize(it_write - nalUnitBuf.begin()); |
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97 | } |
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98 | |
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99 | Void readNalUnitHeader(InputNALUnit& nalu) |
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100 | { |
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101 | TComInputBitstream& bs = *nalu.m_Bitstream; |
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102 | |
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103 | Bool forbidden_zero_bit = bs.read(1); // forbidden_zero_bit |
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104 | assert(forbidden_zero_bit == 0); |
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105 | nalu.m_nalUnitType = (NalUnitType) bs.read(6); // nal_unit_type |
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106 | #if H_MV |
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107 | nalu.m_layerId = bs.read(6); // layerId |
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108 | #else |
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109 | nalu.m_reservedZero6Bits = bs.read(6); // nuh_reserved_zero_6bits |
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110 | assert(nalu.m_reservedZero6Bits == 0); |
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111 | #endif |
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112 | nalu.m_temporalId = bs.read(3) - 1; // nuh_temporal_id_plus1 |
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113 | |
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114 | if ( nalu.m_temporalId ) |
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115 | { |
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116 | assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_LP |
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117 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_RADL |
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118 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_N_LP |
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119 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_W_RADL |
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120 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_N_LP |
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121 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_CRA |
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122 | && nalu.m_nalUnitType != NAL_UNIT_VPS |
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123 | && nalu.m_nalUnitType != NAL_UNIT_SPS |
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124 | && nalu.m_nalUnitType != NAL_UNIT_EOS |
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125 | && nalu.m_nalUnitType != NAL_UNIT_EOB ); |
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126 | } |
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127 | else |
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128 | { |
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129 | #if H_MV |
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130 | |
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131 | // If nal_unit_type is in the range of BLA_W_LP to RSV_IRAP_VCL23, inclusive, i.e. the coded |
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132 | // slice segment belongs to an IRAP picture, TemporalId shall be equal to 0. |
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133 | // Otherwise, when nal_unit_type is equal to TSA_R, TSA_N, STSA_R, or STSA_N, TemporalId shall not be equal to 0. |
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134 | // Otherwise, if nal_unit_type is equal to TSA or TSA_N, TemporalId shall not be equal to 0. |
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135 | // Otherwise, when nuh_layer_id is equal to 0 and nal_unit_type is equal to STSA_R or STSA_N, |
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136 | // TemporalId shall not be equal to 0. |
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137 | |
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138 | assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_R |
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139 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N ); |
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140 | |
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141 | assert( nalu.m_layerId > 0 |
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142 | || ( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R |
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143 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N ) ); |
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144 | #else |
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145 | assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_R |
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146 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N |
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147 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R |
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148 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N ); |
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149 | #endif |
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150 | } |
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151 | } |
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152 | /** |
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153 | * create a NALunit structure with given header values and storage for |
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154 | * a bitstream |
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155 | */ |
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156 | void read(InputNALUnit& nalu, vector<uint8_t>& nalUnitBuf) |
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157 | { |
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158 | /* perform anti-emulation prevention */ |
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159 | TComInputBitstream *pcBitstream = new TComInputBitstream(NULL); |
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160 | convertPayloadToRBSP(nalUnitBuf, pcBitstream, (nalUnitBuf[0] & 64) == 0); |
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161 | |
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162 | nalu.m_Bitstream = new TComInputBitstream(&nalUnitBuf); |
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163 | nalu.m_Bitstream->setEmulationPreventionByteLocation(pcBitstream->getEmulationPreventionByteLocation()); |
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164 | delete pcBitstream; |
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165 | readNalUnitHeader(nalu); |
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166 | } |
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167 | //! \} |
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