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<div class="title">nalu_reader.cc</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2016 Google Inc. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Use of this source code is governed by a BSD-style</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// license that can be found in the LICENSE file or at</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// https://developers.google.com/open-source/licenses/bsd</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/filters/nalu_reader.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/media/base/buffer_reader.h"</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/media/filters/h264_parser.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> IsStartCode(<span class="keyword">const</span> uint8_t* data) {</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">return</span> data[0] == 0x00 && data[1] == 0x00 && data[2] == 0x01;</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> }</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> Nalu::Nalu()</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  : data_(nullptr),</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  header_size_(0),</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  payload_size_(0),</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  ref_idc_(0),</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  nuh_layer_id_(0),</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  nuh_temporal_id_(0),</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  type_(0),</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  is_video_slice_(false) {}</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="keywordtype">bool</span> Nalu::InitializeFromH264(<span class="keyword">const</span> uint8_t* data, uint64_t size) {</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  DCHECK(data);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (size == 0)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  uint8_t header = data[0];</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">if</span> ((header & 0x80) != 0)</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  data_ = data;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  header_size_ = 1;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  payload_size_ = size - header_size_;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  ref_idc_ = (header >> 5) & 0x3;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  type_ = header & 0x1F;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  is_video_slice_ = (type_ >= Nalu::H264_NonIDRSlice &&</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  type_ <= Nalu::H264_IDRSlice);</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> }</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">bool</span> Nalu::InitializeFromH265(<span class="keyword">const</span> uint8_t* data, uint64_t size) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  DCHECK(data);</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">if</span> (size < 2)</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  uint16_t header = (data[0] << 8) | data[1];</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">if</span> ((header & 0x8000) != 0)</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  data_ = data;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  header_size_ = 2;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  payload_size_ = size - header_size_;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  type_ = (header >> 9) & 0x3F;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  nuh_layer_id_ = (header >> 3) & 0x3F;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  nuh_temporal_id_ = (header & 0x7) - 1;</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// Don't treat reserved VCL types as video slices since we cannot parse them.</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  is_video_slice_ =</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  (type_ >= Nalu::H265_TRAIL_N && type_ <= Nalu::H265_RASL_R) ||</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  (type_ >= Nalu::H265_BLA_W_LP && type_ <= Nalu::H265_CRA_NUT);</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
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<div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a47c6d8fa9d49494cf015a32ebecbb35c"> 73</a></span> <a class="code" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a47c6d8fa9d49494cf015a32ebecbb35c">NaluReader::NaluReader</a>(NaluType type,</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  uint8_t nal_length_size,</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> uint8_t* stream,</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  uint64_t stream_size)</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  : stream_(stream),</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  stream_size_(stream_size),</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  nalu_type_(type),</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  nalu_length_size_(nal_length_size),</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  format_(nal_length_size == 0 ? kAnnexbByteStreamFormat</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  : kNalUnitStreamFormat) {</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  DCHECK(stream);</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> }</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> NaluReader::~NaluReader() {}</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d"> 87</a></span> NaluReader::Result <a class="code" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d">NaluReader::Advance</a>(<a class="code" href="../../d2/d72/classedash__packager_1_1media_1_1Nalu.html">Nalu</a>* nalu) {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">if</span> (stream_size_ <= 0)</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">return</span> NaluReader::kEOStream;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> </div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  uint8_t nalu_length_size_or_start_code_size;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  uint64_t nalu_length;</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (format_ == kAnnexbByteStreamFormat) {</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// This will move |stream_| to the start code.</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  uint64_t nalu_length_with_header;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (!LocateNaluByStartCode(&nalu_length_with_header,</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  &nalu_length_size_or_start_code_size)) {</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  LOG(ERROR) << <span class="stringliteral">"Could not find next NALU, bytes left in stream: "</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  << stream_size_;</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// This is actually an error. Since we always move to past the end of</span></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// each NALU, if there is no next start code, then this is the first call</span></div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// and there are no start codes in the stream.</span></div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  nalu_length = nalu_length_with_header - nalu_length_size_or_start_code_size;</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <a class="code" href="../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html">BufferReader</a> reader(stream_, stream_size_);</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (!reader.<a class="code" href="../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html#ac21a2b3a9ed6b2ad20247b6f653d8a02">ReadNBytesInto8</a>(&nalu_length, nalu_length_size_))</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  nalu_length_size_or_start_code_size = nalu_length_size_;</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">if</span> (nalu_length + nalu_length_size_ > stream_size_) {</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  LOG(ERROR) << <span class="stringliteral">"NALU length exceeds stream size: "</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  << stream_size_ << <span class="stringliteral">" < "</span> << nalu_length;</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">if</span> (nalu_length == 0) {</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  LOG(ERROR) << <span class="stringliteral">"NALU size 0"</span>;</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  }</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div>
|
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">const</span> uint8_t* nalu_data = stream_ + nalu_length_size_or_start_code_size;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (nalu_type_ == kH264) {</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (!nalu->InitializeFromH264(nalu_data, nalu_length))</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  DCHECK_EQ(kH265, nalu_type_);</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (!nalu->InitializeFromH265(nalu_data, nalu_length))</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> NaluReader::kInvalidStream;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// Move parser state to after this NALU, so next time Advance</span></div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// is called, we will effectively be skipping it.</span></div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  stream_ += nalu_length_size_or_start_code_size + nalu_length;</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  stream_size_ -= nalu_length_size_or_start_code_size + nalu_length;</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> </div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  DVLOG(4) << <span class="stringliteral">"NALU type: "</span> << <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(nalu->type())</div>
|
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  << <span class="stringliteral">" at: "</span> << reinterpret_cast<const void*>(nalu->data())</div>
|
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  << <span class="stringliteral">" data size: "</span> << nalu->payload_size();</div>
|
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> NaluReader::kOk;</div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> }</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
|
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<div class="line"><a name="l00145"></a><span class="lineno"><a class="line" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db"> 145</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db">NaluReader::StartsWithStartCode</a>() {</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">if</span> (stream_size_ >= 3) {</div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> (IsStartCode(stream_))</div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
|
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (stream_size_ >= 4) {</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">if</span> (stream_[0] == 0x00 && IsStartCode(stream_ + 1))</div>
|
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
|
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> }</div>
|
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment">// static</span></div>
|
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="keywordtype">bool</span> NaluReader::FindStartCode(<span class="keyword">const</span> uint8_t* data,</div>
|
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  uint64_t data_size,</div>
|
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  uint64_t* offset,</div>
|
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  uint8_t* start_code_size) {</div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  uint64_t bytes_left = data_size;</div>
|
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
|
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordflow">while</span> (bytes_left >= 3) {</div>
|
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> (IsStartCode(data)) {</div>
|
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">// Found three-byte start code, set pointer at its beginning.</span></div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  *offset = data_size - bytes_left;</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  *start_code_size = 3;</div>
|
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// If there is a zero byte before this start code,</span></div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">// then it's actually a four-byte start code, so backtrack one byte.</span></div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span> (*offset > 0 && *(data - 1) == 0x00) {</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  --(*offset);</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  ++(*start_code_size);</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  }</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> </div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  ++data;</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  --bytes_left;</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  }</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">// End of data: offset is pointing to the first byte that was not considered</span></div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// as a possible start of a start code.</span></div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  *offset = data_size - bytes_left;</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  *start_code_size = 0;</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> }</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="keywordtype">bool</span> NaluReader::LocateNaluByStartCode(uint64_t* nalu_size,</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  uint8_t* start_code_size) {</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="comment">// Find the start code of next NALU.</span></div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  uint64_t nalu_start_off = 0;</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  uint8_t annexb_start_code_size = 0;</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">if</span> (!FindStartCode(stream_, stream_size_,</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  &nalu_start_off, &annexb_start_code_size)) {</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  DVLOG(4) << <span class="stringliteral">"Could not find start code, end of stream?"</span>;</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  }</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> </div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">// Move the stream to the beginning of the NALU (pointing at the start code).</span></div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  stream_ += nalu_start_off;</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  stream_size_ -= nalu_start_off;</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keyword">const</span> uint8_t* nalu_data = stream_ + annexb_start_code_size;</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  uint64_t max_nalu_data_size = stream_size_ - annexb_start_code_size;</div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">if</span> (max_nalu_data_size <= 0) {</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  DVLOG(3) << <span class="stringliteral">"End of stream"</span>;</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  }</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// Find the start code of next NALU;</span></div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="comment">// if successful, |nalu_size_without_start_code| is the number of bytes from</span></div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">// after previous start code to before this one;</span></div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// if next start code is not found, it is still a valid NALU since there</span></div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// are some bytes left after the first start code: all the remaining bytes</span></div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">// belong to the current NALU.</span></div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  uint64_t nalu_size_without_start_code = 0;</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  uint8_t next_start_code_size = 0;</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">if</span> (!FindStartCode(nalu_data, max_nalu_data_size,</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  &nalu_size_without_start_code, &next_start_code_size)) {</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  nalu_size_without_start_code = max_nalu_data_size;</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  *nalu_size = nalu_size_without_start_code + annexb_start_code_size;</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  *start_code_size = annexb_start_code_size;</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> }</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> } <span class="comment">// namespace media</span></div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> } <span class="comment">// namespace edash_packager</span></div>
|
|
<div class="ttc" id="classedash__packager_1_1media_1_1Nalu_html"><div class="ttname"><a href="../../d2/d72/classedash__packager_1_1media_1_1Nalu.html">edash_packager::media::Nalu</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d87/nalu__reader_8h_source.html#l00026">nalu_reader.h:26</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1NaluReader_html_af9382cd46f2f4d22636f7f5513e8df1d"><div class="ttname"><a href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#af9382cd46f2f4d22636f7f5513e8df1d">edash_packager::media::NaluReader::Advance</a></div><div class="ttdeci">Result Advance(Nalu *nalu)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df5/nalu__reader_8cc_source.html#l00087">nalu_reader.cc:87</a></div></div>
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|
<div class="ttc" id="classedash__packager_1_1media_1_1NaluReader_html_a0f700b8bc3163065111b77d6a37a92db"><div class="ttname"><a href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a0f700b8bc3163065111b77d6a37a92db">edash_packager::media::NaluReader::StartsWithStartCode</a></div><div class="ttdeci">bool StartsWithStartCode()</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df5/nalu__reader_8cc_source.html#l00145">nalu_reader.cc:145</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1NaluReader_html_a47c6d8fa9d49494cf015a32ebecbb35c"><div class="ttname"><a href="../../d3/d6a/classedash__packager_1_1media_1_1NaluReader.html#a47c6d8fa9d49494cf015a32ebecbb35c">edash_packager::media::NaluReader::NaluReader</a></div><div class="ttdeci">NaluReader(NaluType type, uint8_t nal_length_size, const uint8_t *stream, uint64_t stream_size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df5/nalu__reader_8cc_source.html#l00073">nalu_reader.cc:73</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BufferReader_html_ac21a2b3a9ed6b2ad20247b6f653d8a02"><div class="ttname"><a href="../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html#ac21a2b3a9ed6b2ad20247b6f653d8a02">edash_packager::media::BufferReader::ReadNBytesInto8</a></div><div class="ttdeci">bool ReadNBytesInto8(uint64_t *v, size_t num_bytes) WARN_UNUSED_RESULT</div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dbc/buffer__reader_8cc_source.html#l00040">buffer_reader.cc:40</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1BufferReader_html"><div class="ttname"><a href="../../d9/d46/classedash__packager_1_1media_1_1BufferReader.html">edash_packager::media::BufferReader</a></div><div class="ttdef"><b>Definition:</b> <a href="../../de/d3e/buffer__reader_8h_source.html#l00023">buffer_reader.h:23</a></div></div>
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