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<div class="title">webvtt_sample_converter.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 2015 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/webvtt/webvtt_sample_converter.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 <algorithm></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <string></span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/base/strings/string_util.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/base/strings/stringprintf.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/media/base/buffer_writer.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/base/media_sample.h"</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/formats/mp4/box_buffer.h"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "packager/media/formats/mp4/box_definitions.h"</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>media {</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> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> std::shared_ptr<MediaSample> CreateEmptyCueSample(uint64_t start_time,</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  uint64_t end_time) {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  DCHECK_GT(end_time, start_time);</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  mp4::VTTEmptyCueBox empty_cue_box;</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  std::vector<uint8_t> serialized;</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  AppendBoxToVector(&empty_cue_box, &serialized);</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>  std::shared_ptr<MediaSample> empty_cue_sample = <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#ad8975dbb21747ff32c8604f5489bf5c9">MediaSample::CopyFrom</a>(</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  serialized.data(), serialized.size(), <span class="keyword">false</span>);</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  empty_cue_sample->set_pts(start_time);</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  empty_cue_sample->set_duration(end_time - start_time);</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span> empty_cue_sample;</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> </div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keywordtype">void</span> StripTrailingNewlines(<span class="keyword">const</span> std::string& input, std::string* output) {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> found = input.find_last_not_of(<span class="charliteral">'\n'</span>);</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">if</span> (found != std::string::npos) {</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  *output = input.substr(0, found + 1);</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  *output = input;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</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> mp4::VTTCueBox CueBoxFromCue(<span class="keyword">const</span> Cue& cue) {</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  mp4::VTTCueBox cue_box;</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (!cue.identifier.empty()) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  cue_box.cue_id.cue_id = cue.identifier;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span> (!cue.settings.empty()) {</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  cue_box.cue_settings.settings = cue.settings;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</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>  StripTrailingNewlines(cue.payload, &cue_box.cue_payload.cue_text);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> cue_box;</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> std::string TimeToWebVttTimeStamp(uint64_t time_in_ms) {</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> milliseconds = time_in_ms % 1000;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">const</span> uint64_t seconds_left = time_in_ms / 1000;</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> seconds = seconds_left % 60;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">const</span> uint64_t minutes_left = seconds_left / 60;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> minutes = minutes_left % 60;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> hours = minutes_left / 60;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> base::StringPrintf(<span class="stringliteral">"%02d:%02d:%02d.%03d"</span>, hours, minutes, seconds,</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  milliseconds);</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"> 73</span> </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> std::shared_ptr<MediaSample> CreateVTTCueBoxesSample(</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> std::list<const Cue*>& cues,</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  uint64_t start_time,</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  uint64_t end_time) {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// TODO(rkuroiwa): Source IDs must be assigned to the cues and the same cue</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">// should have the same ID in different samples. Probably requires a mapping</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// from cues to IDs.</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  CHECK(!cues.empty());</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  std::vector<uint8_t> data;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  std::string cue_current_time = TimeToWebVttTimeStamp(start_time);</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>  BufferWriter writer;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> Cue* cue : cues) {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  mp4::VTTCueBox cue_box = CueBoxFromCue(*cue);</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// If there is internal timing, i.e. WebVTT cue timestamp, then</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// cue_current_time should be populated</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// "which gives the VTT timestamp associated with the start time of sample."</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// TODO(rkuroiwa): Reuse TimestampToMilliseconds() to check if there is an</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// internal timestamp in the payload to set CueTimeBox.cue_current_time.</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  cue_box.Write(&writer);</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>  std::shared_ptr<MediaSample> sample =</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#ad8975dbb21747ff32c8604f5489bf5c9">MediaSample::CopyFrom</a>(writer.Buffer(), writer.Size(), <span class="keyword">false</span>);</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  sample->set_pts(start_time);</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  sample->set_duration(end_time - start_time);</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> sample;</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="comment">// This function returns the minimum of cue_start_time, cue_end_time,</span></div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment">// current_minimum should be bigger than sweep_line.</span></div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> uint64_t GetMinimumPastSweepLine(uint64_t cue_start_time,</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  uint64_t cue_end_time,</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  uint64_t sweep_line,</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  uint64_t current_minimum) {</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  DCHECK_GE(current_minimum, sweep_line);</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (cue_end_time <= sweep_line)</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> current_minimum;</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="comment">// Anything below is cue_end_time > sweep_line.</span></div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (cue_start_time > sweep_line) {</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// The start time of this cue is past the sweepline, return the min.</span></div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">return</span> std::min(cue_start_time, current_minimum);</div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// The sweep line is at the start or in the middle of a cue.</span></div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">return</span> std::min(cue_end_time, current_minimum);</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> }</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> } <span class="comment">// namespace</span></div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="keywordtype">void</span> AppendBoxToVector(mp4::Box* box, std::vector<uint8_t>* output_vector) {</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  BufferWriter writer;</div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  box->Write(&writer);</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  output_vector->insert(output_vector->end(),</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  writer.Buffer(),</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  writer.Buffer() + writer.Size());</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> }</div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> WebVttSampleConverter::WebVttSampleConverter() : next_cue_start_time_(0u) {}</div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> WebVttSampleConverter::~WebVttSampleConverter() {}</div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> </div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// Note that this |sample| is either a cue or a comment. It does not have any</span></div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment">// info on whether the next cue is overlapping or not.</span></div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"><a class="line" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a651f604362b1dd2660a6fbcdacb75331"> 139</a></span> <span class="keywordtype">void</span> <a class="code" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a651f604362b1dd2660a6fbcdacb75331">WebVttSampleConverter::PushCue</a>(<span class="keyword">const</span> <a class="code" href="../../dd/dce/structshaka_1_1media_1_1Cue.html">Cue</a>& cue) {</div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">if</span> (!cue.comment.empty()) {</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">// A comment. Put it in the buffer and skip.</span></div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <a class="code" href="../../d6/d79/structshaka_1_1media_1_1mp4_1_1VTTAdditionalTextBox.html">mp4::VTTAdditionalTextBox</a> comment;</div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  StripTrailingNewlines(cue.comment, &comment.cue_additional_text);</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  additional_texts_.push_back(comment);</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// TODO(rkuriowa): Handle comments as samples.</span></div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  cues_.push_back(cue);</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">if</span> (cues_.size() == 1) {</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// Cannot make a decision with just one sample. Cache it and wait for</span></div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// another one.</span></div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  next_cue_start_time_ = cues_.front().start_time;</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  }</div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  CHECK_GE(cues_.size(), 2u);</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// TODO(rkuroiwa): This isn't wrong but all the cues where</span></div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="comment">// endtime < latest cue start time</span></div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// can be processed. Change the logic so that if there are cues that meet the</span></div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// condition above, create samples immediately and remove them.</span></div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="comment">// Note: This doesn't mean that all the cues can be removed, just the ones</span></div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="comment">// that meet the condition.</span></div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">bool</span> processed_cues = HandleAllCuesButLatest();</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (!processed_cues)</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// Remove all the cues except the latest one.</span></div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">auto</span> erase_last_iterator = --cues_.end();</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  cues_.erase(cues_.begin(), erase_last_iterator);</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> }</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#aa02d5ce7d9609b3841835fbab74b8c81"> 174</a></span> <span class="keywordtype">void</span> <a class="code" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#aa02d5ce7d9609b3841835fbab74b8c81">WebVttSampleConverter::Flush</a>() {</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">if</span> (cues_.empty())</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">if</span> (cues_.size() == 1) {</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  std::list<const Cue*> temp_list;</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  temp_list.push_back(&cues_.front());</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  CHECK_EQ(next_cue_start_time_, cues_.front().start_time);</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  ready_samples_.push_back(CreateVTTCueBoxesSample(</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  temp_list,</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  next_cue_start_time_,</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  cues_.front().start_time + cues_.front().duration));</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  cues_.clear();</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span>;</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordtype">bool</span> processed_cue = HandleAllCues();</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  CHECK(processed_cue)</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  << <span class="stringliteral">"No cues were processed but the cues should have been flushed."</span>;</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  cues_.clear();</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> }</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"><a class="line" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a3b0e60f307c5ea57d232216eced6af76"> 195</a></span> <span class="keywordtype">size_t</span> <a class="code" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a3b0e60f307c5ea57d232216eced6af76">WebVttSampleConverter::ReadySamplesSize</a>() {</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">return</span> ready_samples_.size();</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> }</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"><a class="line" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a43fa59b53f847b638cf32c6f03f87dcd"> 199</a></span> std::shared_ptr<MediaSample> <a class="code" href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a43fa59b53f847b638cf32c6f03f87dcd">WebVttSampleConverter::PopSample</a>() {</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  CHECK(!ready_samples_.empty());</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  std::shared_ptr<MediaSample> ret = ready_samples_.front();</div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  ready_samples_.pop_front();</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> ret;</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> }</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="comment">// TODO(rkuroiwa): Some samples may be ready. Example:</span></div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment">// Cues:</span></div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment">// |--------- 1 ---------|</span></div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment">// |-- 2 --|</span></div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment">// |-- 3 --|</span></div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment">//</span></div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment">// Samples:</span></div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment">// |A| B | C |</span></div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment">// Samples A, B, and C can be created when Cue 3 is pushed.</span></div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment">// Change algorithm to create A,B,C samples right away.</span></div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment">// Note that this requires change to the caller on which cues</span></div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment">// to remove.</span></div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="keywordtype">bool</span> WebVttSampleConverter::HandleAllCuesButLatest() {</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  DCHECK_GE(cues_.size(), 2u);</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">const</span> <a class="code" href="../../dd/dce/structshaka_1_1media_1_1Cue.html">Cue</a>& latest_cue = cues_.back();</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="comment">// Don't process the cues until the latest cue doesn't overlap with all the</span></div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">// previous cues.</span></div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  uint64_t max_cue_end_time = 0; <span class="comment">// Not including the latest.</span></div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keyword">auto</span> latest_cue_it = --cues_.end();</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">for</span> (<span class="keyword">auto</span> cue_it = cues_.begin(); cue_it != latest_cue_it; ++cue_it) {</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keyword">const</span> <a class="code" href="../../dd/dce/structshaka_1_1media_1_1Cue.html">Cue</a>& cue = *cue_it;</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keyword">const</span> uint64_t cue_end_time = cue.start_time + cue.duration;</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">if</span> (cue_end_time > latest_cue.start_time)</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> </div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">if</span> (max_cue_end_time < cue_end_time)</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  max_cue_end_time = cue_end_time;</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  }</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="comment">// Reaching here means that the latest cue does not overlap with all</span></div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="comment">// the previous cues.</span></div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> </div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="comment">// Because sweep_stop_time is assigned to next_cue_start_time_ it is not</span></div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="comment">// set to latest_cue.start_time here; there may be a gap between</span></div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="comment">// latest_cue.start_time and previous_cue_end_time.</span></div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="comment">// The correctness of SweepCues() doesn't change whether the sweep stops</span></div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">// right before the latest cue or right before the gap.</span></div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keyword">const</span> uint64_t sweep_stop_time = max_cue_end_time;</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">const</span> uint64_t sweep_line_start = cues_.front().start_time;</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordtype">bool</span> processed_cues =</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  SweepCues(sweep_line_start, sweep_stop_time);</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  next_cue_start_time_ = sweep_stop_time;</div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordflow">if</span> (next_cue_start_time_ < latest_cue.start_time) {</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  ready_samples_.push_back(CreateEmptyCueSample(next_cue_start_time_,</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  latest_cue.start_time));</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  next_cue_start_time_ = latest_cue.start_time;</div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">return</span> processed_cues;</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> }</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="keywordtype">bool</span> WebVttSampleConverter::HandleAllCues() {</div>
|
|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  uint64_t latest_time = 0u;</div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> Cue& cue : cues_) {</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">if</span> (cue.start_time + cue.duration > latest_time)</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  latest_time = cue.start_time + cue.duration;</div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  }</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">const</span> uint64_t sweep_line_start = cues_.front().start_time;</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="keyword">const</span> uint64_t sweep_stop_time = latest_time;</div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordtype">bool</span> processed = SweepCues(sweep_line_start, sweep_stop_time);</div>
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  next_cue_start_time_ = sweep_stop_time;</div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">return</span> processed;</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> }</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="keywordtype">bool</span> WebVttSampleConverter::SweepCues(uint64_t sweep_line,</div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  uint64_t sweep_stop_time) {</div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordtype">bool</span> processed_cues = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="comment">// This is a sweep line algorithm. For every iteration, it determines active</span></div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// cues and makes a sample.</span></div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="comment">// At the end of an interation |next_start_time| should be set to the minimum</span></div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">// of all the start and end times of the cues that is after |sweep_line|.</span></div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="comment">// |sweep_line| is set to |next_start_time| before the next iteration.</span></div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">while</span> (sweep_line < sweep_stop_time) {</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  std::list<const Cue*> cues_for_a_sample;</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  uint64_t next_start_time = sweep_stop_time;</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> </div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="comment">// Put all the cues that should be displayed at sweep_line, in</span></div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">// cues_for_a_sample.</span></div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="comment">// next_start_time is also updated in this loop by checking all the cues.</span></div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> Cue& cue : cues_) {</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">if</span> (cue.start_time >= sweep_stop_time)</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">if</span> (cue.start_time >= next_start_time)</div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keyword">const</span> uint64_t cue_end_time = cue.start_time + cue.duration;</div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordflow">if</span> (cue_end_time <= sweep_line)</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  next_start_time = GetMinimumPastSweepLine(</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  cue.start_time, cue_end_time, sweep_line, next_start_time);</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> </div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordflow">if</span> (cue.start_time <= sweep_line) {</div>
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  DCHECK_GT(cue_end_time, sweep_line);</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  cues_for_a_sample.push_back(&cue);</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  }</div>
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<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div>
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  DCHECK(!cues_for_a_sample.empty()) << <span class="stringliteral">"For now the only use case of this "</span></div>
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="stringliteral">"function is to sweep non-empty "</span></div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="stringliteral">"cues."</span>;</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keywordflow">if</span> (!cues_for_a_sample.empty()) {</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  ready_samples_.push_back(CreateVTTCueBoxesSample(</div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  cues_for_a_sample, sweep_line, next_start_time));</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  processed_cues = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  }</div>
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div>
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  sweep_line = next_start_time;</div>
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  }</div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  DCHECK_EQ(sweep_line, sweep_stop_time);</div>
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">return</span> processed_cues;</div>
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<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> }</div>
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<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> </div>
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<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebVttSampleConverter_html_aa02d5ce7d9609b3841835fbab74b8c81"><div class="ttname"><a href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#aa02d5ce7d9609b3841835fbab74b8c81">shaka::media::WebVttSampleConverter::Flush</a></div><div class="ttdeci">virtual void Flush()</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df5/webvtt__sample__converter_8cc_source.html#l00174">webvtt_sample_converter.cc:174</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebVttSampleConverter_html_a3b0e60f307c5ea57d232216eced6af76"><div class="ttname"><a href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a3b0e60f307c5ea57d232216eced6af76">shaka::media::WebVttSampleConverter::ReadySamplesSize</a></div><div class="ttdeci">virtual size_t ReadySamplesSize()</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df5/webvtt__sample__converter_8cc_source.html#l00195">webvtt_sample_converter.cc:195</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebVttSampleConverter_html_a651f604362b1dd2660a6fbcdacb75331"><div class="ttname"><a href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a651f604362b1dd2660a6fbcdacb75331">shaka::media::WebVttSampleConverter::PushCue</a></div><div class="ttdeci">virtual void PushCue(const Cue &cue)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df5/webvtt__sample__converter_8cc_source.html#l00139">webvtt_sample_converter.cc:139</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1MediaSample_html_ad8975dbb21747ff32c8604f5489bf5c9"><div class="ttname"><a href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#ad8975dbb21747ff32c8604f5489bf5c9">shaka::media::MediaSample::CopyFrom</a></div><div class="ttdeci">static std::shared_ptr< MediaSample > CopyFrom(const uint8_t *data, size_t size, bool is_key_frame)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d0d/media__sample_8cc_source.html#l00045">media_sample.cc:45</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1VTTAdditionalTextBox_html"><div class="ttname"><a href="../../d6/d79/structshaka_1_1media_1_1mp4_1_1VTTAdditionalTextBox.html">shaka::media::mp4::VTTAdditionalTextBox</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00818">box_definitions.h:818</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebVttSampleConverter_html_a43fa59b53f847b638cf32c6f03f87dcd"><div class="ttname"><a href="../../de/ddd/classshaka_1_1media_1_1WebVttSampleConverter.html#a43fa59b53f847b638cf32c6f03f87dcd">shaka::media::WebVttSampleConverter::PopSample</a></div><div class="ttdeci">virtual std::shared_ptr< MediaSample > PopSample()</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/df5/webvtt__sample__converter_8cc_source.html#l00199">webvtt_sample_converter.cc:199</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1Cue_html"><div class="ttname"><a href="../../dd/dce/structshaka_1_1media_1_1Cue.html">shaka::media::Cue</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d6a/cue_8h_source.html#l00018">cue.h:18</a></div></div>
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