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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> } <span class="comment">// namespace</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> TextChunker::TextChunker(<span class="keywordtype">double</span> segment_duration_in_seconds)</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  : segment_duration_in_seconds_(segment_duration_in_seconds){};</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> Status TextChunker::Process(std::unique_ptr<StreamData> data) {</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keywordflow">switch</span> (data->stream_data_type) {</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">case</span> StreamDataType::kStreamInfo:</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">return</span> OnStreamInfo(std::move(data->stream_info));</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">case</span> StreamDataType::kTextSample:</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">return</span> OnTextSample(data->text_sample);</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">case</span> StreamDataType::kCueEvent:</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordflow">return</span> OnCueEvent(data->cue_event);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR,</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="stringliteral">"Invalid stream data type for this handler"</span>);</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  }</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> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> Status TextChunker::OnFlushRequest(<span class="keywordtype">size_t</span> input_stream_index) {</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// Keep outputting segments until all the samples leave the system. Calling</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="comment">// |DispatchSegment| will remove samples over time.</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">while</span> (samples_in_current_segment_.size()) {</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  RETURN_IF_ERROR(DispatchSegment(segment_duration_));</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  }</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">return</span> FlushAllDownstreams();</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> }</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> Status TextChunker::OnStreamInfo(std::shared_ptr<const StreamInfo> info) {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  time_scale_ = info->time_scale();</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  segment_duration_ = ScaleTime(segment_duration_in_seconds_);</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> DispatchStreamInfo(kStreamIndex, std::move(info));</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::OnCueEvent(std::shared_ptr<const CueEvent> event) {</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// We are going to end the current segment prematurely using the cue event's</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// time as the new segment end.</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// Because the cue should have been inserted into the stream such that no</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// later sample could start before it does, we know that there should</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// be no later samples starting before the cue event.</span></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>  <span class="comment">// Convert the event's time to be scaled to the time of each sample.</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">const</span> int64_t event_time = ScaleTime(event->time_in_seconds);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// Output all full segments before the segment that the cue event interupts.</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">while</span> (segment_start_ + segment_duration_ < event_time) {</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  RETURN_IF_ERROR(DispatchSegment(segment_duration_));</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> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> int64_t shorten_duration = event_time - segment_start_;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  RETURN_IF_ERROR(DispatchSegment(shorten_duration));</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> DispatchCueEvent(kStreamIndex, std::move(event));</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> }</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> Status TextChunker::OnTextSample(std::shared_ptr<const TextSample> sample) {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Output all segments that come before our new sample.</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> int64_t sample_start = sample->start_time();</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>  <span class="comment">// If we have not seen a sample yet, base all segments off the first sample's</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// start time.</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">if</span> (segment_start_ < 0) {</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// Force the first segment to start at the segment that would have started</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// before the sample. This should allow segments from different streams to</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// align.</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  segment_start_ = (sample_start / segment_duration_) * segment_duration_;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// We need to write all the segments that would have ended before the new</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">// sample started.</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">while</span> (sample_start >= segment_start_ + segment_duration_) {</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// |DispatchSegment| will advance |segment_start_|.</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  RETURN_IF_ERROR(DispatchSegment(segment_duration_));</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> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  samples_in_current_segment_.push_back(std::move(sample));</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>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> }</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> Status TextChunker::DispatchSegment(int64_t duration) {</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  DCHECK_GT(duration, 0) << <span class="stringliteral">"Segment duration should always be positive"</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>  <span class="comment">// Output all the samples that are part of the segment.</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>& sample : samples_in_current_segment_) {</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  RETURN_IF_ERROR(DispatchTextSample(kStreamIndex, sample));</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// Output the segment info.</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  std::shared_ptr<SegmentInfo> info = std::make_shared<SegmentInfo>();</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  info->start_timestamp = segment_start_;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  info->duration = duration;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  RETURN_IF_ERROR(DispatchSegmentInfo(kStreamIndex, std::move(info)));</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// Move onto the next segment.</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">const</span> int64_t new_segment_start = segment_start_ + duration;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  segment_start_ = new_segment_start;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// Remove all samples that end before the (new) current segment started.</span></div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  samples_in_current_segment_.remove_if(</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  [new_segment_start](<span class="keyword">const</span> std::shared_ptr<const TextSample>& sample) {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// For the sample to even be in this list, it should have started</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// before the (new) current segment.</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  DCHECK_LT(sample->start_time(), new_segment_start);</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span> sample->EndTime() <= new_segment_start;</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  });</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> int64_t TextChunker::ScaleTime(<span class="keywordtype">double</span> seconds)<span class="keyword"> const </span>{</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  DCHECK_GT(time_scale_, 0) << <span class="stringliteral">"Need positive time scale to scale time."</span>;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span>int64_t<span class="keyword">></span>(seconds * time_scale_);</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> }</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</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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