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 | #include <vector> |
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35 | #include <algorithm> |
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36 | #include <ostream> |
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37 | |
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38 | #include "TLibCommon/NAL.h" |
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39 | #include "TLibCommon/TComBitStream.h" |
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40 | #include "NALwrite.h" |
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41 | |
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42 | using namespace std; |
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43 | |
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44 | //! \ingroup TLibEncoder |
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45 | //! \{ |
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46 | |
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47 | static const Char emulation_prevention_three_byte[] = {3}; |
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48 | |
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49 | Void writeNalUnitHeader(ostream& out, OutputNALUnit& nalu) // nal_unit_header() |
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50 | { |
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51 | TComOutputBitstream bsNALUHeader; |
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52 | |
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53 | bsNALUHeader.write(0,1); // forbidden_zero_bit |
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54 | bsNALUHeader.write(nalu.m_nalUnitType, 6); // nal_unit_type |
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55 | #if SVC_EXTENSION |
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56 | bsNALUHeader.write(nalu.m_layerId, 6); // reserved_one_5bits |
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57 | #else |
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58 | bsNALUHeader.write(nalu.m_reservedZero6Bits, 6); // nuh_reserved_zero_6bits |
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59 | #endif |
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60 | bsNALUHeader.write(nalu.m_temporalId+1, 3); // nuh_temporal_id_plus1 |
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61 | |
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62 | out.write(bsNALUHeader.getByteStream(), bsNALUHeader.getByteStreamLength()); |
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63 | } |
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64 | /** |
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65 | * write nalu to bytestream out, performing RBSP anti startcode |
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66 | * emulation as required. nalu.m_RBSPayload must be byte aligned. |
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67 | */ |
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68 | void write(ostream& out, OutputNALUnit& nalu) |
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69 | { |
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70 | writeNalUnitHeader(out, nalu); |
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71 | /* write out rsbp_byte's, inserting any required |
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72 | * emulation_prevention_three_byte's */ |
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73 | /* 7.4.1 ... |
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74 | * emulation_prevention_three_byte is a byte equal to 0x03. When an |
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75 | * emulation_prevention_three_byte is present in the NAL unit, it shall be |
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76 | * discarded by the decoding process. |
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77 | * The last byte of the NAL unit shall not be equal to 0x00. |
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78 | * Within the NAL unit, the following three-byte sequences shall not occur at |
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79 | * any byte-aligned position: |
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80 | * - 0x000000 |
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81 | * - 0x000001 |
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82 | * - 0x000002 |
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83 | * Within the NAL unit, any four-byte sequence that starts with 0x000003 |
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84 | * other than the following sequences shall not occur at any byte-aligned |
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85 | * position: |
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86 | * - 0x00000300 |
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87 | * - 0x00000301 |
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88 | * - 0x00000302 |
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89 | * - 0x00000303 |
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90 | */ |
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91 | vector<uint8_t>& rbsp = nalu.m_Bitstream.getFIFO(); |
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92 | |
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93 | #if P0130_EOB |
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94 | if (rbsp.size() == 0) return; |
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95 | #endif |
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96 | |
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97 | for (vector<uint8_t>::iterator it = rbsp.begin(); it != rbsp.end();) |
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98 | { |
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99 | /* 1) find the next emulated 00 00 {00,01,02,03} |
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100 | * 2a) if not found, write all remaining bytes out, stop. |
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101 | * 2b) otherwise, write all non-emulated bytes out |
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102 | * 3) insert emulation_prevention_three_byte |
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103 | */ |
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104 | vector<uint8_t>::iterator found = it; |
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105 | do |
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106 | { |
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107 | /* NB, end()-1, prevents finding a trailing two byte sequence */ |
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108 | found = search_n(found, rbsp.end()-1, 2, 0); |
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109 | found++; |
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110 | /* if not found, found == end, otherwise found = second zero byte */ |
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111 | if (found == rbsp.end()) |
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112 | break; |
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113 | if (*(++found) <= 3) |
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114 | break; |
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115 | } while (true); |
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116 | |
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117 | it = found; |
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118 | if (found != rbsp.end()) |
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119 | { |
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120 | it = rbsp.insert(found, emulation_prevention_three_byte[0]); |
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121 | } |
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122 | } |
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123 | |
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124 | out.write((Char*)&(*rbsp.begin()), rbsp.end() - rbsp.begin()); |
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125 | |
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126 | /* 7.4.1.1 |
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127 | * ... when the last byte of the RBSP data is equal to 0x00 (which can |
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128 | * only occur when the RBSP ends in a cabac_zero_word), a final byte equal |
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129 | * to 0x03 is appended to the end of the data. |
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130 | */ |
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131 | if (rbsp.back() == 0x00) |
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132 | { |
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133 | out.write(emulation_prevention_three_byte, 1); |
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134 | } |
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135 | } |
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136 | |
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137 | /** |
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138 | * Write rbsp_trailing_bits to bs causing it to become byte-aligned |
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139 | */ |
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140 | void writeRBSPTrailingBits(TComOutputBitstream& bs) |
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141 | { |
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142 | bs.write( 1, 1 ); |
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143 | bs.writeAlignZero(); |
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144 | } |
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145 | |
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146 | /** |
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147 | * Copy NALU from naluSrc to naluDest |
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148 | */ |
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149 | void copyNaluData(OutputNALUnit& naluDest, const OutputNALUnit& naluSrc) |
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150 | { |
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151 | naluDest.m_nalUnitType = naluSrc.m_nalUnitType; |
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152 | naluDest.m_reservedZero6Bits = naluSrc.m_reservedZero6Bits; |
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153 | naluDest.m_temporalId = naluSrc.m_temporalId; |
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154 | naluDest.m_Bitstream = naluSrc.m_Bitstream; |
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155 | #if SVC_EXTENSION |
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156 | naluDest.m_layerId = naluSrc.m_layerId; |
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157 | #endif |
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158 | } |
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159 | |
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160 | //! \} |
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