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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2017 Google Inc. All rights reserved.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div><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><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><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><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/chunking/text_chunker.h"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "packager/status_macros.h"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">namespace </span>media {</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>{</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> kStreamIndex = 0;</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> std::shared_ptr<const SegmentInfo> MakeSegmentInfo(int64_t start_ms,</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  int64_t end_ms) {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  DCHECK_LT(start_ms, end_ms);</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  std::shared_ptr<SegmentInfo> info = std::make_shared<SegmentInfo>();</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  info->start_timestamp = start_ms;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  info->duration = end_ms - start_ms;</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">return</span> info;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> }</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> TextChunker::TextChunker(int64_t segment_duration_ms)</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  : segment_duration_ms_(segment_duration_ms),</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  segment_start_ms_(0),</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  segment_expected_end_ms_(segment_duration_ms) {}</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> Status TextChunker::InitializeInternal() {</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> }</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> Status TextChunker::Process(std::unique_ptr<StreamData> data) {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">switch</span> (data->stream_data_type) {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">case</span> StreamDataType::kStreamInfo:</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> OnStreamInfo(std::move(data->stream_info));</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">case</span> StreamDataType::kTextSample:</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">return</span> OnTextSample(data->text_sample);</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">case</span> StreamDataType::kCueEvent:</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">return</span> OnCueEvent(data->cue_event);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR,</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="stringliteral">"Invalid stream data type for this handler"</span>);</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> Status TextChunker::OnFlushRequest(<span class="keywordtype">size_t</span> input_stream_index) {</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// Keep outputting segments until all the samples leave the system.</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">while</span> (segment_samples_.size()) {</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  RETURN_IF_ERROR(EndSegment(segment_expected_end_ms_));</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  }</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> FlushAllDownstreams();</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> }</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> Status TextChunker::OnStreamInfo(std::shared_ptr<const StreamInfo> info) {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// There is no information we need from the stream info, so just pass it</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// downstream.</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> DispatchStreamInfo(kStreamIndex, std::move(info));</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> }</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> Status TextChunker::OnCueEvent(std::shared_ptr<const CueEvent> event) {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// We are going to cut the current segment into two using the event's time as</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// the division.</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">const</span> int64_t cue_time_in_ms = <span class="keyword">event</span>->time_in_seconds * 1000;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// In the case that there is a gap with no samples between the last sample</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// and the cue event, output all the segments until we get to the segment that</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// the cue event interrupts.</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">while</span> (segment_expected_end_ms_ < cue_time_in_ms) {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  RETURN_IF_ERROR(EndSegment(segment_expected_end_ms_));</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  RETURN_IF_ERROR(EndSegment(cue_time_in_ms));</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  RETURN_IF_ERROR(DispatchCueEvent(kStreamIndex, std::move(event)));</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> Status TextChunker::OnTextSample(std::shared_ptr<const TextSample> sample) {</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// Output all segments that come before our new sample.</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">while</span> (segment_expected_end_ms_ <= sample->start_time()) {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  RETURN_IF_ERROR(EndSegment(segment_expected_end_ms_));</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  segment_samples_.push_back(std::move(sample));</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> }</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> Status TextChunker::EndSegment(int64_t segment_actual_end_ms) {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// Output all the samples that are part of the segment.</span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>& sample : segment_samples_) {</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  RETURN_IF_ERROR(DispatchTextSample(kStreamIndex, sample));</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  RETURN_IF_ERROR(DispatchSegmentInfo(</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  kStreamIndex, MakeSegmentInfo(segment_start_ms_, segment_actual_end_ms)));</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Create a new segment that comes right after the old segment and remove all</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// samples that don't cross over into the new segment.</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  StartNewSegment(segment_actual_end_ms);</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> }</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="keywordtype">void</span> TextChunker::StartNewSegment(int64_t start_ms) {</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  segment_start_ms_ = start_ms;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  segment_expected_end_ms_ = start_ms + segment_duration_ms_;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// Remove all samples that no longer overlap with the new segment.</span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  segment_samples_.remove_if(</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  [start_ms](<span class="keyword">const</span> std::shared_ptr<const TextSample>& sample) {</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span> sample->EndTime() <= start_ms;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  });</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> }</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> </div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> } <span class="comment">// namespace shaka</span></div><div class="ttc" id="namespaceshaka_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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