[56] | 1 | /* The copyright in this software is being made available under the BSD |
---|
| 2 | * License, included below. This software may be subject to other third party |
---|
| 3 | * and contributor rights, including patent rights, and no such rights are |
---|
| 4 | * granted under this license. |
---|
| 5 | * |
---|
[608] | 6 | * Copyright (c) 2010-2013, ITU/ISO/IEC |
---|
[56] | 7 | * All rights reserved. |
---|
| 8 | * |
---|
| 9 | * Redistribution and use in source and binary forms, with or without |
---|
| 10 | * modification, are permitted provided that the following conditions are met: |
---|
| 11 | * |
---|
| 12 | * * Redistributions of source code must retain the above copyright notice, |
---|
| 13 | * this list of conditions and the following disclaimer. |
---|
| 14 | * * Redistributions in binary form must reproduce the above copyright notice, |
---|
| 15 | * this list of conditions and the following disclaimer in the documentation |
---|
| 16 | * and/or other materials provided with the distribution. |
---|
| 17 | * * Neither the name of the ITU/ISO/IEC nor the names of its contributors may |
---|
| 18 | * be used to endorse or promote products derived from this software without |
---|
| 19 | * specific prior written permission. |
---|
| 20 | * |
---|
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
---|
| 22 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS |
---|
| 25 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
---|
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
---|
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
---|
| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
---|
| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
---|
| 30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
---|
| 31 | * THE POSSIBILITY OF SUCH DAMAGE. |
---|
| 32 | */ |
---|
| 33 | |
---|
[608] | 34 | /** |
---|
| 35 | \file NALread.cpp |
---|
| 36 | \brief reading funtionality for NAL units |
---|
| 37 | */ |
---|
| 38 | |
---|
| 39 | |
---|
[56] | 40 | #include <vector> |
---|
| 41 | #include <algorithm> |
---|
| 42 | #include <ostream> |
---|
| 43 | |
---|
| 44 | #include "NALread.h" |
---|
| 45 | #include "TLibCommon/NAL.h" |
---|
| 46 | #include "TLibCommon/TComBitStream.h" |
---|
| 47 | |
---|
| 48 | using namespace std; |
---|
| 49 | |
---|
| 50 | //! \ingroup TLibDecoder |
---|
| 51 | //! \{ |
---|
[608] | 52 | static void convertPayloadToRBSP(vector<uint8_t>& nalUnitBuf, TComInputBitstream *bitstream, Bool isVclNalUnit) |
---|
[56] | 53 | { |
---|
[608] | 54 | UInt zeroCount = 0; |
---|
[56] | 55 | vector<uint8_t>::iterator it_read, it_write; |
---|
| 56 | |
---|
[608] | 57 | UInt pos = 0; |
---|
| 58 | bitstream->clearEmulationPreventionByteLocation(); |
---|
| 59 | for (it_read = it_write = nalUnitBuf.begin(); it_read != nalUnitBuf.end(); it_read++, it_write++, pos++) |
---|
[56] | 60 | { |
---|
[608] | 61 | assert(zeroCount < 2 || *it_read >= 0x03); |
---|
| 62 | if (zeroCount == 2 && *it_read == 0x03) |
---|
[56] | 63 | { |
---|
[608] | 64 | bitstream->pushEmulationPreventionByteLocation( pos ); |
---|
| 65 | pos++; |
---|
| 66 | it_read++; |
---|
| 67 | zeroCount = 0; |
---|
| 68 | if (it_read == nalUnitBuf.end()) |
---|
[56] | 69 | { |
---|
[608] | 70 | break; |
---|
[56] | 71 | } |
---|
| 72 | } |
---|
[608] | 73 | zeroCount = (*it_read == 0x00) ? zeroCount+1 : 0; |
---|
| 74 | *it_write = *it_read; |
---|
[56] | 75 | } |
---|
[608] | 76 | assert(zeroCount == 0); |
---|
| 77 | |
---|
| 78 | if (isVclNalUnit) |
---|
[56] | 79 | { |
---|
[608] | 80 | // Remove cabac_zero_word from payload if present |
---|
| 81 | Int n = 0; |
---|
| 82 | |
---|
| 83 | while (it_write[-1] == 0x00) |
---|
[56] | 84 | { |
---|
[608] | 85 | it_write--; |
---|
| 86 | n++; |
---|
[56] | 87 | } |
---|
[608] | 88 | |
---|
| 89 | if (n > 0) |
---|
| 90 | { |
---|
| 91 | printf("\nDetected %d instances of cabac_zero_word", n/2); |
---|
| 92 | } |
---|
[56] | 93 | } |
---|
| 94 | |
---|
| 95 | nalUnitBuf.resize(it_write - nalUnitBuf.begin()); |
---|
| 96 | } |
---|
| 97 | |
---|
[608] | 98 | Void readNalUnitHeader(InputNALUnit& nalu) |
---|
| 99 | { |
---|
| 100 | TComInputBitstream& bs = *nalu.m_Bitstream; |
---|
| 101 | |
---|
| 102 | Bool forbidden_zero_bit = bs.read(1); // forbidden_zero_bit |
---|
| 103 | assert(forbidden_zero_bit == 0); |
---|
| 104 | nalu.m_nalUnitType = (NalUnitType) bs.read(6); // nal_unit_type |
---|
| 105 | #if H_MV |
---|
| 106 | nalu.m_layerId = bs.read(6); // layerId |
---|
| 107 | #else |
---|
| 108 | nalu.m_reservedZero6Bits = bs.read(6); // nuh_reserved_zero_6bits |
---|
| 109 | assert(nalu.m_reservedZero6Bits == 0); |
---|
| 110 | #endif |
---|
| 111 | nalu.m_temporalId = bs.read(3) - 1; // nuh_temporal_id_plus1 |
---|
| 112 | |
---|
| 113 | if ( nalu.m_temporalId ) |
---|
| 114 | { |
---|
| 115 | assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_LP |
---|
| 116 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_W_RADL |
---|
| 117 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_N_LP |
---|
| 118 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_W_RADL |
---|
| 119 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_N_LP |
---|
| 120 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_CRA |
---|
| 121 | && nalu.m_nalUnitType != NAL_UNIT_VPS |
---|
| 122 | && nalu.m_nalUnitType != NAL_UNIT_SPS |
---|
| 123 | && nalu.m_nalUnitType != NAL_UNIT_EOS |
---|
| 124 | && nalu.m_nalUnitType != NAL_UNIT_EOB ); |
---|
| 125 | } |
---|
| 126 | else |
---|
| 127 | { |
---|
| 128 | assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TLA_R |
---|
| 129 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N |
---|
| 130 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R |
---|
| 131 | && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N ); |
---|
| 132 | } |
---|
| 133 | } |
---|
[56] | 134 | /** |
---|
| 135 | * create a NALunit structure with given header values and storage for |
---|
| 136 | * a bitstream |
---|
| 137 | */ |
---|
| 138 | void read(InputNALUnit& nalu, vector<uint8_t>& nalUnitBuf) |
---|
| 139 | { |
---|
| 140 | /* perform anti-emulation prevention */ |
---|
| 141 | TComInputBitstream *pcBitstream = new TComInputBitstream(NULL); |
---|
[608] | 142 | convertPayloadToRBSP(nalUnitBuf, pcBitstream, (nalUnitBuf[0] & 64) == 0); |
---|
| 143 | |
---|
[56] | 144 | nalu.m_Bitstream = new TComInputBitstream(&nalUnitBuf); |
---|
[608] | 145 | nalu.m_Bitstream->setEmulationPreventionByteLocation(pcBitstream->getEmulationPreventionByteLocation()); |
---|
[56] | 146 | delete pcBitstream; |
---|
[608] | 147 | readNalUnitHeader(nalu); |
---|
[56] | 148 | } |
---|
| 149 | //! \} |
---|