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<div class="title">es_parser_dvb.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 2020 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/formats/mp2t/es_parser_dvb.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/media/base/bit_reader.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/text_stream_info.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/base/timestamp.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/media/formats/mp2t/mp2t_common.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>mp2t {</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>{</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="keywordtype">bool</span> ParseSubtitlingDescriptor(</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">const</span> uint8_t* descriptor,</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordtype">size_t</span> size,</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  std::unordered_map<uint16_t, std::string>* langs) {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="comment">// See ETSI EN 300 468 Section 6.2.41.</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  BitReader reader(descriptor, size);</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">size_t</span> data_size;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  RCHECK(reader.SkipBits(8)); <span class="comment">// descriptor_tag</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  RCHECK(reader.ReadBits(8, &data_size));</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  RCHECK(data_size + 2 <= size);</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < data_size; i += 8) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  uint32_t lang_code;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  uint16_t page;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  RCHECK(reader.ReadBits(24, &lang_code));</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  RCHECK(reader.SkipBits(8)); <span class="comment">// subtitling_type</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  RCHECK(reader.ReadBits(16, &page));</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  RCHECK(reader.SkipBits(16)); <span class="comment">// ancillary_page_id</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">// The lang code is a ISO 639-2 code coded in Latin-1.</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  std::string lang(3, <span class="charliteral">'\0'</span>);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  lang[0] = (lang_code >> 16) & 0xff;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  lang[1] = (lang_code >> 8) & 0xff;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  lang[2] = (lang_code >> 0) & 0xff;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  langs->emplace(page, std::move(lang));</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> }</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> } <span class="comment">// namespace</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> EsParserDvb::EsParserDvb(uint32_t pid,</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keyword">const</span> NewStreamInfoCB& new_stream_info_cb,</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">const</span> EmitTextSampleCB& emit_sample_cb,</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">const</span> uint8_t* descriptor,</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">size_t</span> descriptor_length)</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  : EsParser(pid),</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  new_stream_info_cb_(new_stream_info_cb),</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  emit_sample_cb_(emit_sample_cb) {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (!ParseSubtitlingDescriptor(descriptor, descriptor_length, &languages_)) {</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  LOG(WARNING) << <span class="stringliteral">"Error parsing subtitling descriptor"</span>;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</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>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> EsParserDvb::~EsParserDvb() {}</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="keywordtype">bool</span> EsParserDvb::Parse(<span class="keyword">const</span> uint8_t* buf,</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">int</span> size,</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  int64_t pts,</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  int64_t dts) {</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (!sent_info_) {</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  sent_info_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  std::shared_ptr<TextStreamInfo> info = std::make_shared<TextStreamInfo>(</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  pid(), kMpeg2Timescale, kInfiniteDuration, kCodecText,</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">/* codec_string= */</span> <span class="stringliteral">""</span>, <span class="comment">/* codec_config= */</span> <span class="stringliteral">""</span>, <span class="comment">/* width= */</span> 0,</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">/* height= */</span> 0, <span class="comment">/* language= */</span> <span class="stringliteral">""</span>);</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>& pair : languages_) {</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  info->AddSubStream(pair.first, {pair.second});</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  new_stream_info_cb_.Run(info);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// TODO: Handle buffering and multiple reads? All content so far has been</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// a whole segment, so it may not be needed.</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> ParseInternal(buf, size, pts);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</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"> 87</span> <span class="keywordtype">bool</span> EsParserDvb::Flush() {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span>& pair : parsers_) {</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  std::vector<std::shared_ptr<TextSample>> samples;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  RCHECK(pair.second.Flush(&samples));</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> sample : samples) {</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  sample->set_sub_stream_index(pair.first);</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  emit_sample_cb_.Run(sample);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  }</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  }</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> }</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="keywordtype">void</span> EsParserDvb::Reset() {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  parsers_.clear();</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keywordtype">bool</span> EsParserDvb::ParseInternal(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">size_t</span> size, int64_t pts) {</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// See EN 300 743 Table 3.</span></div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  BitReader reader(data, size);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordtype">int</span> data_identifier;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">int</span> subtitle_stream_id;</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  RCHECK(reader.ReadBits(8, &data_identifier));</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  RCHECK(reader.ReadBits(8, &subtitle_stream_id));</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  RCHECK(data_identifier == 0x20);</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  RCHECK(subtitle_stream_id == 0);</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  </div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">int</span> temp;</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">while</span> (reader.ReadBits(8, &temp) && temp == 0xf) {</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  DvbSubSegmentType segment_type;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  uint16_t page_id;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordtype">size_t</span> segment_length;</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  RCHECK(reader.ReadBits(8, &segment_type));</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  RCHECK(reader.ReadBits(16, &page_id));</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  RCHECK(reader.ReadBits(16, &segment_length));</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  RCHECK(reader.bits_available() > segment_length * 8);</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">const</span> uint8_t* payload = data + (size - reader.bits_available() / 8);</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  std::vector<std::shared_ptr<TextSample>> samples;</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  RCHECK(parsers_[page_id].Parse(segment_type, pts, payload, segment_length,</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  &samples));</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> sample : samples) {</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  sample->set_sub_stream_index(page_id);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  emit_sample_cb_.Run(sample);</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>  RCHECK(reader.SkipBytes(segment_length));</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">return</span> temp == 0xff;</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> }</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> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="anamespaceshaka_html"><div class="ttname"><a href="../../d8/daf/namespaceshaka.html">shaka</a></div><div class="ttdoc">All the methods that are virtual are virtual for mocking.</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011">gflags_hex_bytes.cc:11</a></div></div>
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