[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 | #pragma once |
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| 35 | |
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[1029] | 36 | #ifndef __ANNEXBWRITE__ |
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| 37 | #define __ANNEXBWRITE__ |
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| 38 | |
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[313] | 39 | #include <ostream> |
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| 40 | #include "TLibCommon/AccessUnit.h" |
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| 41 | #include "NALwrite.h" |
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| 42 | |
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| 43 | //! \ingroup TLibEncoder |
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| 44 | //! \{ |
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| 45 | |
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| 46 | /** |
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| 47 | * write all NALunits in au to bytestream out in a manner satisfying |
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| 48 | * AnnexB of AVC. NALunits are written in the order they are found in au. |
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| 49 | * the zero_byte word is appended to: |
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| 50 | * - the initial startcode in the access unit, |
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| 51 | * - any SPS/PPS nal units |
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| 52 | */ |
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| 53 | static std::vector<UInt> writeAnnexB(std::ostream& out, const AccessUnit& au) |
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| 54 | { |
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| 55 | std::vector<UInt> annexBsizes; |
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| 56 | |
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| 57 | for (AccessUnit::const_iterator it = au.begin(); it != au.end(); it++) |
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| 58 | { |
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| 59 | const NALUnitEBSP& nalu = **it; |
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| 60 | UInt size = 0; /* size of annexB unit in bytes */ |
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| 61 | |
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| 62 | static const Char start_code_prefix[] = {0,0,0,1}; |
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[713] | 63 | if (it == au.begin() || nalu.m_nalUnitType == NAL_UNIT_VPS || nalu.m_nalUnitType == NAL_UNIT_SPS || nalu.m_nalUnitType == NAL_UNIT_PPS) |
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[313] | 64 | { |
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| 65 | /* From AVC, When any of the following conditions are fulfilled, the |
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| 66 | * zero_byte syntax element shall be present: |
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| 67 | * - the nal_unit_type within the nal_unit() is equal to 7 (sequence |
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| 68 | * parameter set) or 8 (picture parameter set), |
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| 69 | * - the byte stream NAL unit syntax structure contains the first NAL |
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| 70 | * unit of an access unit in decoding order, as specified by subclause |
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| 71 | * 7.4.1.2.3. |
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| 72 | */ |
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| 73 | out.write(start_code_prefix, 4); |
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| 74 | size += 4; |
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| 75 | } |
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| 76 | else |
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| 77 | { |
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| 78 | out.write(start_code_prefix+1, 3); |
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| 79 | size += 3; |
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| 80 | } |
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| 81 | out << nalu.m_nalUnitData.str(); |
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| 82 | size += UInt(nalu.m_nalUnitData.str().size()); |
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| 83 | |
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| 84 | annexBsizes.push_back(size); |
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| 85 | } |
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| 86 | |
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| 87 | return annexBsizes; |
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| 88 | } |
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| 89 | //! \} |
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[1029] | 90 | |
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| 91 | #endif |
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