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comparison jctvc/TLibEncoder/AnnexBwrite.h @ 0:772086c29cc7

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Initial import.
author Matti Hamalainen <ccr@tnsp.org>
date Wed, 16 Nov 2016 11:16:33 +0200
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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) 2010-2014, 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 */
53 static 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 Char 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(start_code_prefix, 4);
74 size += 4;
75 }
76 else
77 {
78 out.write(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