source: SHVCSoftware/branches/SHM-dev/source/Lib/TLibEncoder/NALwrite.cpp @ 1353

Last change on this file since 1353 was 1352, checked in by seregin, 9 years ago

port rev 4430

  • Property svn:eol-style set to native
File size: 4.5 KB
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[313]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 *
[1259]6 * Copyright (c) 2010-2015, ITU/ISO/IEC
[313]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
34#include <vector>
35#include <algorithm>
36#include <ostream>
37
38#include "TLibCommon/NAL.h"
39#include "TLibCommon/TComBitStream.h"
40#include "NALwrite.h"
41
42using namespace std;
43
44//! \ingroup TLibEncoder
45//! \{
46
47static const Char emulation_prevention_three_byte[] = {3};
48
49Void writeNalUnitHeader(ostream& out, OutputNALUnit& nalu)       // nal_unit_header()
50{
51TComOutputBitstream bsNALUHeader;
52
53  bsNALUHeader.write(0,1);                    // forbidden_zero_bit
54  bsNALUHeader.write(nalu.m_nalUnitType, 6);  // nal_unit_type
[1237]55  bsNALUHeader.write(nalu.m_nuhLayerId, 6);   // nuh_layer_id
[313]56  bsNALUHeader.write(nalu.m_temporalId+1, 3); // nuh_temporal_id_plus1
57
58  out.write(bsNALUHeader.getByteStream(), bsNALUHeader.getByteStreamLength());
59}
60/**
61 * write nalu to bytestream out, performing RBSP anti startcode
62 * emulation as required.  nalu.m_RBSPayload must be byte aligned.
63 */
[1029]64Void write(ostream& out, OutputNALUnit& nalu)
[313]65{
66  writeNalUnitHeader(out, nalu);
67  /* write out rsbp_byte's, inserting any required
68   * emulation_prevention_three_byte's */
69  /* 7.4.1 ...
70   * emulation_prevention_three_byte is a byte equal to 0x03. When an
71   * emulation_prevention_three_byte is present in the NAL unit, it shall be
72   * discarded by the decoding process.
73   * The last byte of the NAL unit shall not be equal to 0x00.
74   * Within the NAL unit, the following three-byte sequences shall not occur at
75   * any byte-aligned position:
76   *  - 0x000000
77   *  - 0x000001
78   *  - 0x000002
79   * Within the NAL unit, any four-byte sequence that starts with 0x000003
80   * other than the following sequences shall not occur at any byte-aligned
81   * position:
82   *  - 0x00000300
83   *  - 0x00000301
84   *  - 0x00000302
85   *  - 0x00000303
86   */
87  vector<uint8_t>& rbsp   = nalu.m_Bitstream.getFIFO();
88
[1029]89  vector<uint8_t> outputBuffer;
90  outputBuffer.resize(rbsp.size()*2+1); //there can never be enough emulation_prevention_three_bytes to require this much space
91  std::size_t outputAmount = 0;
92  Int         zeroCount    = 0;
93  for (vector<uint8_t>::iterator it = rbsp.begin(); it != rbsp.end(); it++)
[713]94  {
[1029]95    const uint8_t v=(*it);
96    if (zeroCount==2 && v<=3)
[313]97    {
[1029]98      outputBuffer[outputAmount++]=emulation_prevention_three_byte[0];
99      zeroCount=0;
[313]100    }
[1246]101
102    if (v==0)
103    {
104      zeroCount++;
105    }
106    else
107    {
108      zeroCount=0;
109    }
[1029]110    outputBuffer[outputAmount++]=v;
[313]111  }
112
113  /* 7.4.1.1
114   * ... when the last byte of the RBSP data is equal to 0x00 (which can
115   * only occur when the RBSP ends in a cabac_zero_word), a final byte equal
116   * to 0x03 is appended to the end of the data.
117   */
[1246]118  if (zeroCount>0)
119  {
120    outputBuffer[outputAmount++]=emulation_prevention_three_byte[0];
121  }
[1029]122  out.write((Char*)&(*outputBuffer.begin()), outputAmount);
[313]123}
124
125//! \}
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