[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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[1259] | 6 | * Copyright (c) 2010-2015, ITU/ISO/IEC |
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[313] | 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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[1237] | 55 | bsNALUHeader.write(nalu.m_nuhLayerId, 6); // nuh_layer_id |
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[313] | 56 | bsNALUHeader.write(nalu.m_temporalId+1, 3); // nuh_temporal_id_plus1 |
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| 57 | |
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| 58 | out.write(bsNALUHeader.getByteStream(), bsNALUHeader.getByteStreamLength()); |
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| 59 | } |
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| 60 | /** |
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| 61 | * write nalu to bytestream out, performing RBSP anti startcode |
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| 62 | * emulation as required. nalu.m_RBSPayload must be byte aligned. |
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| 63 | */ |
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[1029] | 64 | Void write(ostream& out, OutputNALUnit& nalu) |
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[313] | 65 | { |
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| 66 | writeNalUnitHeader(out, nalu); |
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| 67 | /* write out rsbp_byte's, inserting any required |
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| 68 | * emulation_prevention_three_byte's */ |
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| 69 | /* 7.4.1 ... |
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| 70 | * emulation_prevention_three_byte is a byte equal to 0x03. When an |
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| 71 | * emulation_prevention_three_byte is present in the NAL unit, it shall be |
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| 72 | * discarded by the decoding process. |
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| 73 | * The last byte of the NAL unit shall not be equal to 0x00. |
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| 74 | * Within the NAL unit, the following three-byte sequences shall not occur at |
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| 75 | * any byte-aligned position: |
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| 76 | * - 0x000000 |
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| 77 | * - 0x000001 |
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| 78 | * - 0x000002 |
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| 79 | * Within the NAL unit, any four-byte sequence that starts with 0x000003 |
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| 80 | * other than the following sequences shall not occur at any byte-aligned |
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| 81 | * position: |
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| 82 | * - 0x00000300 |
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| 83 | * - 0x00000301 |
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| 84 | * - 0x00000302 |
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| 85 | * - 0x00000303 |
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| 86 | */ |
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| 87 | vector<uint8_t>& rbsp = nalu.m_Bitstream.getFIFO(); |
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| 88 | |
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[1029] | 89 | vector<uint8_t> outputBuffer; |
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| 90 | outputBuffer.resize(rbsp.size()*2+1); //there can never be enough emulation_prevention_three_bytes to require this much space |
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| 91 | std::size_t outputAmount = 0; |
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| 92 | Int zeroCount = 0; |
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| 93 | for (vector<uint8_t>::iterator it = rbsp.begin(); it != rbsp.end(); it++) |
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[713] | 94 | { |
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[1029] | 95 | const uint8_t v=(*it); |
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| 96 | if (zeroCount==2 && v<=3) |
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[313] | 97 | { |
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[1029] | 98 | outputBuffer[outputAmount++]=emulation_prevention_three_byte[0]; |
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| 99 | zeroCount=0; |
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[313] | 100 | } |
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[1246] | 101 | |
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| 102 | if (v==0) |
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| 103 | { |
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| 104 | zeroCount++; |
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| 105 | } |
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| 106 | else |
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| 107 | { |
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| 108 | zeroCount=0; |
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| 109 | } |
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[1029] | 110 | outputBuffer[outputAmount++]=v; |
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[313] | 111 | } |
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| 112 | |
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| 113 | /* 7.4.1.1 |
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| 114 | * ... when the last byte of the RBSP data is equal to 0x00 (which can |
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| 115 | * only occur when the RBSP ends in a cabac_zero_word), a final byte equal |
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| 116 | * to 0x03 is appended to the end of the data. |
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| 117 | */ |
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[1246] | 118 | if (zeroCount>0) |
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| 119 | { |
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| 120 | outputBuffer[outputAmount++]=emulation_prevention_three_byte[0]; |
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| 121 | } |
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[1029] | 122 | out.write((Char*)&(*outputBuffer.begin()), outputAmount); |
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[313] | 123 | } |
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| 124 | |
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| 125 | /** |
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| 126 | * Write rbsp_trailing_bits to bs causing it to become byte-aligned |
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| 127 | */ |
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[1029] | 128 | Void writeRBSPTrailingBits(TComOutputBitstream& bs) |
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[313] | 129 | { |
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| 130 | bs.write( 1, 1 ); |
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| 131 | bs.writeAlignZero(); |
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| 132 | } |
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| 133 | |
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| 134 | //! \} |
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