source: 3DVCSoftware/trunk/source/Lib/TLibEncoder/AnnexBwrite.h @ 189

Last change on this file since 189 was 56, checked in by hschwarz, 12 years ago

updated trunk (move to HM6.1)

File size: 3.4 KB
Line 
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) 2010-2012, 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#pragma once
35
36#include <ostream>
37#include "TLibCommon/AccessUnit.h"
38#include "NALwrite.h"
39
40//! \ingroup TLibEncoder
41//! \{
42
43/**
44 * write all NALunits in au to bytestream out in a manner satisfying
45 * AnnexB of AVC.  NALunits are written in the order they are found in au.
46 * the zero_byte word is appended to:
47 *  - the initial startcode in the access unit,
48 *  - any SPS/PPS nal units
49 */
50static std::vector<unsigned> writeAnnexB(std::ostream& out, const AccessUnit& au)
51{
52  std::vector<unsigned> annexBsizes;
53
54  for (AccessUnit::const_iterator it = au.begin(); it != au.end(); it++)
55  {
56    const NALUnitEBSP& nalu = **it;
57    unsigned size = 0; /* size of annexB unit in bytes */
58
59    static const char start_code_prefix[] = {0,0,0,1};
60    if (it == au.begin() || nalu.m_nalUnitType == NAL_UNIT_SPS || nalu.m_nalUnitType == NAL_UNIT_PPS)
61    {
62      /* From AVC, When any of the following conditions are fulfilled, the
63       * zero_byte syntax element shall be present:
64       *  - the nal_unit_type within the nal_unit() is equal to 7 (sequence
65       *    parameter set) or 8 (picture parameter set),
66       *  - the byte stream NAL unit syntax structure contains the first NAL
67       *    unit of an access unit in decoding order, as specified by subclause
68       *    7.4.1.2.3.
69       */
70      out.write(start_code_prefix, 4);
71      size += 4;
72    }
73    else
74    {
75      out.write(start_code_prefix+1, 3);
76      size += 3;
77    }
78    out << nalu.m_nalUnitData.str();
79    size += unsigned(nalu.m_nalUnitData.str().size());
80
81    annexBsizes.push_back(size);
82  }
83
84  return annexBsizes;
85}
86//! \}
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