source: 3DVCSoftware/trunk/source/Lib/TLibEncoder/AnnexBwrite.h @ 1386

Last change on this file since 1386 was 1386, checked in by tech, 9 years ago

Merged 15.1-dev1@1381.

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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) 2010-2015, 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#ifndef __ANNEXBWRITE__
37#define __ANNEXBWRITE__
38
39#include <ostream>
40#include "TLibCommon/AccessUnit.h"
41#include "NALwrite.h"
42
43//! \ingroup TLibEncoder
44//! \{
45
46/**
47 * write all NALunits in au to bytestream out in a manner satisfying
48 * AnnexB of AVC.  NALunits are written in the order they are found in au.
49 * the zero_byte word is appended to:
50 *  - the initial startcode in the access unit,
51 *  - any SPS/PPS nal units
52 */
53static std::vector<UInt> writeAnnexB(std::ostream& out, const AccessUnit& au)
54{
55  std::vector<UInt> annexBsizes;
56
57  for (AccessUnit::const_iterator it = au.begin(); it != au.end(); it++)
58  {
59    const NALUnitEBSP& nalu = **it;
60    UInt size = 0; /* size of annexB unit in bytes */
61
62    static const UChar start_code_prefix[] = {0,0,0,1};
63    if (it == au.begin() || nalu.m_nalUnitType == NAL_UNIT_VPS || nalu.m_nalUnitType == NAL_UNIT_SPS || nalu.m_nalUnitType == NAL_UNIT_PPS)
64    {
65      /* From AVC, When any of the following conditions are fulfilled, the
66       * zero_byte syntax element shall be present:
67       *  - the nal_unit_type within the nal_unit() is equal to 7 (sequence
68       *    parameter set) or 8 (picture parameter set),
69       *  - the byte stream NAL unit syntax structure contains the first NAL
70       *    unit of an access unit in decoding order, as specified by subclause
71       *    7.4.1.2.3.
72       */
73      out.write(reinterpret_cast<const TChar*>(start_code_prefix), 4);
74      size += 4;
75    }
76    else
77    {
78      out.write(reinterpret_cast<const TChar*>(start_code_prefix+1), 3);
79      size += 3;
80    }
81    out << nalu.m_nalUnitData.str();
82    size += UInt(nalu.m_nalUnitData.str().size());
83
84    annexBsizes.push_back(size);
85  }
86
87  return annexBsizes;
88}
89//! \}
90
91#endif
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