HEVC Test Model (HM)  HM-16.3
AnnexBwrite.h
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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 
45 
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 }
90 
91 #endif
char Char
Definition: TypeDef.h:291
unsigned int UInt
Definition: TypeDef.h:297
NalUnitType m_nalUnitType
nal_unit_type
Definition: NAL.h:49
Access Unit class (header)
std::ostringstream m_nalUnitData
Definition: NAL.h:105
static std::vector< UInt > writeAnnexB(std::ostream &out, const AccessUnit &au)
Definition: AnnexBwrite.h:53