source: 3DVCSoftware/tags/HTM-DEV-0.1/source/Lib/TLibDecoder/NALread.cpp @ 324

Last change on this file since 324 was 324, checked in by tech, 11 years ago

Initial development version for update to latest HM version.
Includes MV-HEVC and basic extensions for 3D-HEVC.

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File size: 4.8 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
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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/**
35 \file     NALread.cpp
36 \brief    reading funtionality for NAL units
37 */
38
39
40#include <vector>
41#include <algorithm>
42#include <ostream>
43
44#include "NALread.h"
45#include "TLibCommon/NAL.h"
46#include "TLibCommon/TComBitStream.h"
47
48using namespace std;
49
50//! \ingroup TLibDecoder
51//! \{
52static void convertPayloadToRBSP(vector<uint8_t>& nalUnitBuf, Bool isVclNalUnit)
53{
54  UInt zeroCount = 0;
55  vector<uint8_t>::iterator it_read, it_write;
56
57  for (it_read = it_write = nalUnitBuf.begin(); it_read != nalUnitBuf.end(); it_read++, it_write++)
58  {
59    assert(zeroCount < 2 || *it_read >= 0x03);
60    if (zeroCount == 2 && *it_read == 0x03)
61    {
62      it_read++;
63      zeroCount = 0;
64      if (it_read == nalUnitBuf.end())
65      {
66        break;
67      }
68    }
69    zeroCount = (*it_read == 0x00) ? zeroCount+1 : 0;
70    *it_write = *it_read;
71  }
72  assert(zeroCount == 0);
73 
74  if (isVclNalUnit)
75  {
76    // Remove cabac_zero_word from payload if present
77    Int n = 0;
78   
79    while (it_write[-1] == 0x00)
80    {
81      it_write--;
82      n++;
83    }
84   
85    if (n > 0)
86    {
87      printf("\nDetected %d instances of cabac_zero_word", n/2);     
88    }
89  }
90
91  nalUnitBuf.resize(it_write - nalUnitBuf.begin());
92}
93
94Void readNalUnitHeader(InputNALUnit& nalu)
95{
96  TComInputBitstream& bs = *nalu.m_Bitstream;
97
98  Bool forbidden_zero_bit = bs.read(1);           // forbidden_zero_bit
99  assert(forbidden_zero_bit == 0);
100  nalu.m_nalUnitType = (NalUnitType) bs.read(6);  // nal_unit_type
101#if H_MV
102  nalu.m_layerId = bs.read(6);                 // layerId
103#else
104  nalu.m_reservedZero6Bits = bs.read(6);       // nuh_reserved_zero_6bits
105  assert(nalu.m_reservedZero6Bits == 0);
106#endif
107  nalu.m_temporalId = bs.read(3) - 1;             // nuh_temporal_id_plus1
108
109  if ( nalu.m_temporalId )
110  {
111    assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA
112         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLANT
113         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_BLA_N_LP
114         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR
115         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_IDR_N_LP
116         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_CRA
117         && nalu.m_nalUnitType != NAL_UNIT_VPS
118         && nalu.m_nalUnitType != NAL_UNIT_SPS
119         && nalu.m_nalUnitType != NAL_UNIT_EOS
120         && nalu.m_nalUnitType != NAL_UNIT_EOB );
121  }
122  else
123  {
124    assert( nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TLA
125         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_TSA_N
126         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_R
127         && nalu.m_nalUnitType != NAL_UNIT_CODED_SLICE_STSA_N );
128  }
129}
130/**
131 * create a NALunit structure with given header values and storage for
132 * a bitstream
133 */
134void read(InputNALUnit& nalu, vector<uint8_t>& nalUnitBuf)
135{
136  /* perform anti-emulation prevention */
137  TComInputBitstream *pcBitstream = new TComInputBitstream(NULL);
138  convertPayloadToRBSP(nalUnitBuf, (nalUnitBuf[0] & 64) == 0);
139 
140  nalu.m_Bitstream = new TComInputBitstream(&nalUnitBuf);
141  delete pcBitstream;
142  readNalUnitHeader(nalu);
143}
144//! \}
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