[313] | 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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[555] | 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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[313] | 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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