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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_1338cd99faf71b6cb1609e99e3340e45.html">chunking</a></li> </ul>
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<div class="title">sync_point_queue.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 2018 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/sync_point_queue.h"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "packager/media/base/media_handler.h"</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <limits></span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</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> SyncPointQueue::SyncPointQueue(<span class="keyword">const</span> AdCueGeneratorParams& params)</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  : sync_condition_(&lock_) {</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> Cuepoint& point : params.cue_points) {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  std::shared_ptr<CueEvent> <span class="keyword">event</span> = std::make_shared<CueEvent>();</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keyword">event</span>->time_in_seconds = point.start_time_in_seconds;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  unpromoted_[point.start_time_in_seconds] = std::move(event);</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  }</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> </div><div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a84f1c4ad047ffa4bd75d5d1426bf9cd2"> 25</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a84f1c4ad047ffa4bd75d5d1426bf9cd2">SyncPointQueue::AddThread</a>() {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  base::AutoLock auto_lock(lock_);</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  thread_count_++;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a77ec615ca1fa21d347bf03c537af9ed8"> 30</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a77ec615ca1fa21d347bf03c537af9ed8">SyncPointQueue::Cancel</a>() {</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>  base::AutoLock auto_lock(lock_);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  cancelled_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  }</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  sync_condition_.Broadcast();</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> </div><div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#aef18f6547ff76cb8c6a5e14270950a59"> 38</a></span> <span class="keywordtype">double</span> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#aef18f6547ff76cb8c6a5e14270950a59">SyncPointQueue::GetHint</a>(<span class="keywordtype">double</span> time_in_seconds) {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  base::AutoLock auto_lock(lock_);</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="keyword">auto</span> iter = promoted_.upper_bound(time_in_seconds);</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">if</span> (iter != promoted_.end())</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">return</span> iter->first;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  iter = unpromoted_.upper_bound(time_in_seconds);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (iter != unpromoted_.end())</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> iter->first;</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>  <span class="comment">// Use MAX DOUBLE as the fall back so that we can force all streams to run</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// out all their samples even when there are no cues.</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> std::numeric_limits<double>::max();</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> }</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a49bdaa61608fe2229eaff4032dd804b1"> 54</a></span> std::shared_ptr<const CueEvent> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a49bdaa61608fe2229eaff4032dd804b1">SyncPointQueue::GetNext</a>(</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">double</span> hint_in_seconds) {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  base::AutoLock auto_lock(lock_);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">while</span> (!cancelled_) {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// Find the promoted cue that would line up with our hint, which is the</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// first cue that is not less than |hint_in_seconds|.</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">auto</span> iter = promoted_.lower_bound(hint_in_seconds);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">if</span> (iter != promoted_.end()) {</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">return</span> iter->second;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</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>  <span class="comment">// Promote |hint_in_seconds| if everyone is waiting.</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span> (waiting_thread_count_ + 1 == thread_count_) {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  std::shared_ptr<const CueEvent> cue = PromoteAtNoLocking(hint_in_seconds);</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  CHECK(cue);</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> cue;</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> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  waiting_thread_count_++;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// This blocks until either a cue is promoted or all threads are blocked</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// (in which case, the unpromoted cue at the hint will be self-promoted</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// and returned - see section above). Spurious signal events are possible</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// with most condition variable implementations, so if it returns, we go</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// back and check if a cue is actually promoted or not.</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  sync_condition_.Wait();</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  waiting_thread_count_--;</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> <span class="keyword">nullptr</span>;</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"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a17af2cb9949f40ee8aa06cfdd55b2c16"> 84</a></span> std::shared_ptr<const CueEvent> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a17af2cb9949f40ee8aa06cfdd55b2c16">SyncPointQueue::PromoteAt</a>(</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">double</span> time_in_seconds) {</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  base::AutoLock auto_lock(lock_);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> PromoteAtNoLocking(time_in_seconds);</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"><a class="line" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a5d27bfb8e8c3209222352f721f9b5236"> 90</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a5d27bfb8e8c3209222352f721f9b5236">SyncPointQueue::HasMore</a>(<span class="keywordtype">double</span> hint_in_seconds)<span class="keyword"> const </span>{</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> hint_in_seconds < std::numeric_limits<double>::max();</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> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> std::shared_ptr<const CueEvent> SyncPointQueue::PromoteAtNoLocking(</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">double</span> time_in_seconds) {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  lock_.AssertAcquired();</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>  <span class="comment">// It is possible that |time_in_seconds| has been promoted.</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">auto</span> iter = promoted_.find(time_in_seconds);</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (iter != promoted_.end())</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> iter->second;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// Find the unpromoted cue that would work for the given time, which is the</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// first cue that is not greater than |time_in_seconds|.</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// So find the the first cue that is greater than |time_in_seconds| first and</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// then get the previous one.</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  iter = unpromoted_.upper_bound(time_in_seconds);</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// The first cue in |unpromoted_| should not be greater than</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// |time_in_seconds|. It could happen only if it has been promoted at a</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// different timestamp, which can only be the result of unaligned GOPs.</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> (iter == unpromoted_.begin())</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">auto</span> prev_iter = std::prev(iter);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  DCHECK(prev_iter != unpromoted_.end());</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>  std::shared_ptr<CueEvent> cue = prev_iter->second;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  cue->time_in_seconds = time_in_seconds;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  promoted_[time_in_seconds] = cue;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// Remove all unpromoted cues up to the cue that was just promoted.</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// User may provide multiple cue points at the same or similar timestamps. The</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// extra unused cues are simply ignored.</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  unpromoted_.erase(unpromoted_.begin(), iter);</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="comment">// Wake up other threads that may be waiting.</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  sync_condition_.Broadcast();</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span> std::move(cue);</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> }</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> } <span class="comment">// namespace shaka</span></div><div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_a84f1c4ad047ffa4bd75d5d1426bf9cd2"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a84f1c4ad047ffa4bd75d5d1426bf9cd2">shaka::media::SyncPointQueue::AddThread</a></div><div class="ttdeci">void AddThread()</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00025">sync_point_queue.cc:25</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_a5d27bfb8e8c3209222352f721f9b5236"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a5d27bfb8e8c3209222352f721f9b5236">shaka::media::SyncPointQueue::HasMore</a></div><div class="ttdeci">bool HasMore(double hint_in_seconds) const</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00090">sync_point_queue.cc:90</a></div></div>
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<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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<div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_a49bdaa61608fe2229eaff4032dd804b1"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a49bdaa61608fe2229eaff4032dd804b1">shaka::media::SyncPointQueue::GetNext</a></div><div class="ttdeci">std::shared_ptr< const CueEvent > GetNext(double hint_in_seconds)</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00054">sync_point_queue.cc:54</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_a17af2cb9949f40ee8aa06cfdd55b2c16"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a17af2cb9949f40ee8aa06cfdd55b2c16">shaka::media::SyncPointQueue::PromoteAt</a></div><div class="ttdeci">std::shared_ptr< const CueEvent > PromoteAt(double time_in_seconds)</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00084">sync_point_queue.cc:84</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_a77ec615ca1fa21d347bf03c537af9ed8"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#a77ec615ca1fa21d347bf03c537af9ed8">shaka::media::SyncPointQueue::Cancel</a></div><div class="ttdeci">void Cancel()</div><div class="ttdoc">Cancel the queue and unblock all threads. </div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00030">sync_point_queue.cc:30</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1SyncPointQueue_html_aef18f6547ff76cb8c6a5e14270950a59"><div class="ttname"><a href="../../d0/dea/classshaka_1_1media_1_1SyncPointQueue.html#aef18f6547ff76cb8c6a5e14270950a59">shaka::media::SyncPointQueue::GetHint</a></div><div class="ttdeci">double GetHint(double time_in_seconds)</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d52/sync__point__queue_8cc_source.html#l00038">sync_point_queue.cc:38</a></div></div>
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