source: 3DVCSoftware/branches/HTM-DEV-0.1-dev/source/Lib/TLibEncoder/NALwrite.cpp @ 368

Last change on this file since 368 was 368, checked in by tech, 11 years ago

Fixed erroneously removed parts.

  • Property svn:eol-style set to native
File size: 5.4 KB
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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 *
6 * Copyright (c) 2010-2013, ITU/ISO/IEC
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
55#if H_MV
56  bsNALUHeader.write(nalu.m_layerId, 6);      // layerId       
57#else
58  bsNALUHeader.write(nalu.m_reservedZero6Bits, 6);                   // nuh_reserved_zero_6bits
59#endif
60  bsNALUHeader.write(nalu.m_temporalId+1, 3); // nuh_temporal_id_plus1
61
62  out.write(bsNALUHeader.getByteStream(), bsNALUHeader.getByteStreamLength());
63}
64/**
65 * write nalu to bytestream out, performing RBSP anti startcode
66 * emulation as required.  nalu.m_RBSPayload must be byte aligned.
67 */
68void write(ostream& out, OutputNALUnit& nalu)
69{
70  writeNalUnitHeader(out, nalu);
71  /* write out rsbp_byte's, inserting any required
72   * emulation_prevention_three_byte's */
73  /* 7.4.1 ...
74   * emulation_prevention_three_byte is a byte equal to 0x03. When an
75   * emulation_prevention_three_byte is present in the NAL unit, it shall be
76   * discarded by the decoding process.
77   * The last byte of the NAL unit shall not be equal to 0x00.
78   * Within the NAL unit, the following three-byte sequences shall not occur at
79   * any byte-aligned position:
80   *  - 0x000000
81   *  - 0x000001
82   *  - 0x000002
83   * Within the NAL unit, any four-byte sequence that starts with 0x000003
84   * other than the following sequences shall not occur at any byte-aligned
85   * position:
86   *  - 0x00000300
87   *  - 0x00000301
88   *  - 0x00000302
89   *  - 0x00000303
90   */
91  vector<uint8_t>& rbsp   = nalu.m_Bitstream.getFIFO();
92
93  for (vector<uint8_t>::iterator it = rbsp.begin(); it != rbsp.end();)
94  {
95    /* 1) find the next emulated 00 00 {00,01,02,03}
96     * 2a) if not found, write all remaining bytes out, stop.
97     * 2b) otherwise, write all non-emulated bytes out
98     * 3) insert emulation_prevention_three_byte
99     */
100    vector<uint8_t>::iterator found = it;
101    do
102    {
103      /* NB, end()-1, prevents finding a trailing two byte sequence */
104      found = search_n(found, rbsp.end()-1, 2, 0);
105      found++;
106      /* if not found, found == end, otherwise found = second zero byte */
107      if (found == rbsp.end())
108        break;
109      if (*(++found) <= 3)
110        break;
111    } while (true);
112
113    it = found;
114    if (found != rbsp.end())
115    {
116      it = rbsp.insert(found, emulation_prevention_three_byte[0]);
117    }
118  }
119
120  out.write((Char*)&(*rbsp.begin()), rbsp.end() - rbsp.begin());
121
122  /* 7.4.1.1
123   * ... when the last byte of the RBSP data is equal to 0x00 (which can
124   * only occur when the RBSP ends in a cabac_zero_word), a final byte equal
125   * to 0x03 is appended to the end of the data.
126   */
127  if (rbsp.back() == 0x00)
128  {
129    out.write(emulation_prevention_three_byte, 1);
130  }
131}
132
133/**
134 * Write rbsp_trailing_bits to bs causing it to become byte-aligned
135 */
136void writeRBSPTrailingBits(TComOutputBitstream& bs)
137{
138  bs.write( 1, 1 );
139  bs.writeAlignZero();
140}
141
142/**
143 * Copy NALU from naluSrc to naluDest
144 */
145void copyNaluData(OutputNALUnit& naluDest, const OutputNALUnit& naluSrc)
146{
147  naluDest.m_nalUnitType = naluSrc.m_nalUnitType;
148#if H_MV
149  naluDest.m_layerId  = naluSrc.m_layerId;
150#else
151  naluDest.m_reservedZero6Bits  = naluSrc.m_reservedZero6Bits;
152#endif
153  naluDest.m_temporalId  = naluSrc.m_temporalId;
154  naluDest.m_Bitstream   = naluSrc.m_Bitstream;
155}
156
157//! \}
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