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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/cue_alignment_handler.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="comment">// The max number of samples that are allowed to be buffered before we shutdown</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// because there is likely a problem with the content or how the pipeline was</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// configured. This is about 20 seconds of buffer for audio with 48kHz.</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> kMaxBufferSize = 1000;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keywordtype">double</span> TimeInSeconds(<span class="keyword">const</span> StreamInfo& info, <span class="keyword">const</span> StreamData& data) {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  int64_t time_scale;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  int64_t scaled_time;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">switch</span> (data.stream_data_type) {</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordflow">case</span> StreamDataType::kMediaSample:</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  time_scale = info.time_scale();</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">if</span> (info.stream_type() == kStreamAudio) {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// Return the start time for video and mid-point for audio, so that for</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// an audio sample, if the portion of the sample after the cue point is</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// bigger than the portion of the sample before the cue point, the</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="comment">// sample is placed after the cue.</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="comment">// It does not matter for text samples as text samples will be cut at</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="comment">// cue point.</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  scaled_time =</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  data.media_sample->pts() + data.media_sample->duration() / 2;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  scaled_time = data.media_sample->pts();</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>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">case</span> StreamDataType::kTextSample:</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// Text is always in MS but the stream info time scale is 0.</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  time_scale = 1000;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  scaled_time = data.text_sample->start_time();</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  time_scale = 0;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  scaled_time = 0;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  NOTREACHED() << <span class="stringliteral">"TimeInSeconds should only be called on media samples "</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="stringliteral">"and text samples."</span>;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keywordtype">double</span><span class="keyword">></span>(scaled_time) / time_scale;</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"> 54</span> Status GetNextCue(<span class="keywordtype">double</span> hint,</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  SyncPointQueue* sync_points,</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  std::shared_ptr<const CueEvent>* out_cue) {</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  DCHECK(sync_points);</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  DCHECK(out_cue);</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  *out_cue = sync_points->GetNext(hint);</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">// |*out_cue| will only be null if the job was cancelled.</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> *out_cue ? Status::OK</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  : Status(error::CANCELLED, <span class="stringliteral">"SyncPointQueue is cancelled."</span>);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> }</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> CueAlignmentHandler::CueAlignmentHandler(SyncPointQueue* sync_points)</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  : sync_points_(sync_points) {}</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> Status CueAlignmentHandler::InitializeInternal() {</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  sync_points_->AddThread();</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  stream_states_.resize(num_input_streams());</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// Get the first hint for the stream. Use a negative hint so that if there is</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// suppose to be a sync point at zero, we will still respect it.</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  hint_ = sync_points_->GetHint(-1);</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> Status::OK;</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> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> Status CueAlignmentHandler::Process(std::unique_ptr<StreamData> data) {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">switch</span> (data->stream_data_type) {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">case</span> StreamDataType::kStreamInfo:</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> OnStreamInfo(std::move(data));</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">case</span> StreamDataType::kTextSample:</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">case</span> StreamDataType::kMediaSample:</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> OnSample(std::move(data));</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  VLOG(3) << <span class="stringliteral">"Dropping unsupported data type "</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  << <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(data->stream_data_type);</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  }</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> Status CueAlignmentHandler::OnFlushRequest(<span class="keywordtype">size_t</span> stream_index) {</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  stream_states_[stream_index].to_be_flushed = <span class="keyword">true</span>;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// We need to wait for all stream to flush before we can flush each stream.</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// This allows cached buffers to be cleared and cues to be properly</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// synchronized and set on all streams.</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> StreamState& stream_state : stream_states_) {</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">if</span> (!stream_state.to_be_flushed) {</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> Status::OK;</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>  }</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> </div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// Do a once over all the streams to ensure that their states are as we expect</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// them. Video and non-video streams have different allowances here. Video</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// should absolutely have no cues or samples where as non-video streams may</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// have cues or samples.</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">for</span> (StreamState& stream : stream_states_) {</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  DCHECK(stream.to_be_flushed);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (stream.info->stream_type() == kStreamVideo) {</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  DCHECK_EQ(stream.samples.size(), 0u)</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  << <span class="stringliteral">"Video streams should not store samples"</span>;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  DCHECK_EQ(stream.cues.size(), 0u)</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  << <span class="stringliteral">"Video streams should not store cues"</span>;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  }</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// It is possible that we did not get all the cues. |hint_| will get updated</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// when we call |UseNextSyncPoint|.</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">while</span> (sync_points_->HasMore(hint_)) {</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  std::shared_ptr<const CueEvent> next_cue;</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  RETURN_IF_ERROR(GetNextCue(hint_, sync_points_, &next_cue));</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  RETURN_IF_ERROR(UseNewSyncPoint(std::move(next_cue)));</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> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// Now that there are new cues, it may be possible to dispatch some of the</span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// samples that may be left waiting.</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">for</span> (StreamState& stream : stream_states_) {</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  RETURN_IF_ERROR(RunThroughSamples(&stream));</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  DCHECK_EQ(stream.samples.size(), 0u);</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">// It is possible for there to be cues that come after all the samples. Make</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">// sure to send them out too.</span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">while</span> (stream.cues.size()) {</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  RETURN_IF_ERROR(<a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(stream.cues.front())));</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  stream.cues.pop_front();</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  }</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keywordflow">return</span> <a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#ab644ca7b0a0dbcbc42936f2dfb979ca5">FlushAllDownstreams</a>();</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> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> Status CueAlignmentHandler::OnStreamInfo(std::unique_ptr<StreamData> data) {</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  StreamState& stream_state = stream_states_[data->stream_index];</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// Keep a copy of the stream info so that we can check type and check</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// timescale.</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  stream_state.info = data->stream_info;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">return</span> <a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(data));</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</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> Status CueAlignmentHandler::OnVideoSample(std::unique_ptr<StreamData> sample) {</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  DCHECK(sample);</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  DCHECK(sample->media_sample);</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> stream_index = sample->stream_index;</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  StreamState& stream = stream_states_[stream_index];</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> sample_time = TimeInSeconds(*stream.info, *sample);</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> is_key_frame = sample->media_sample->is_key_frame();</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordflow">if</span> (is_key_frame && sample_time >= hint_) {</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keyword">auto</span> next_sync = sync_points_->PromoteAt(sample_time);</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> </div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">if</span> (!next_sync) {</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  LOG(ERROR) << <span class="stringliteral">"Failed to promote sync point at "</span> << sample_time</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  << <span class="stringliteral">". This happens only if video streams are not GOP-aligned."</span>;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">return</span> Status(error::INVALID_ARGUMENT,</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="stringliteral">"Streams are not properly GOP-aligned."</span>);</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  }</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> </div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  RETURN_IF_ERROR(UseNewSyncPoint(std::move(next_sync)));</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  DCHECK_EQ(stream.cues.size(), 1u);</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  RETURN_IF_ERROR(<a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(stream.cues.front())));</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  stream.cues.pop_front();</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  }</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">return</span> <a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(sample));</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> }</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span> Status CueAlignmentHandler::OnNonVideoSample(</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  std::unique_ptr<StreamData> sample) {</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  DCHECK(sample);</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  DCHECK(sample->media_sample || sample->text_sample);</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> </div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> stream_index = sample->stream_index;</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  StreamState& stream_state = stream_states_[stream_index];</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>  <span class="comment">// Accept the sample. This will output it if it comes before the hint point or</span></div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="comment">// will cache it if it comes after the hint point.</span></div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  RETURN_IF_ERROR(AcceptSample(std::move(sample), &stream_state));</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>  <span class="comment">// If all the streams are waiting on a hint, it means that none has next sync</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="comment">// point determined. It also means that there are no video streams and we need</span></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// to wait for all streams to converge on a hint so that we can get the next</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// sync point.</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (EveryoneWaitingAtHint()) {</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  std::shared_ptr<const CueEvent> next_sync;</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  RETURN_IF_ERROR(GetNextCue(hint_, sync_points_, &next_sync));</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  RETURN_IF_ERROR(UseNewSyncPoint(next_sync));</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  }</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span> </div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span> }</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> Status CueAlignmentHandler::OnSample(std::unique_ptr<StreamData> sample) {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="comment">// There are two modes:</span></div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">// 1. There is a video input.</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="comment">// 2. There are no video inputs.</span></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">//</span></div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// When there is a video input, we rely on the video input get the next sync</span></div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// point and release all the samples.</span></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="comment">//</span></div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="comment">// When there are no video inputs, we rely on the sync point queue to block</span></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">// us until there is a sync point.</span></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="keyword">const</span> <span class="keywordtype">size_t</span> stream_index = sample->stream_index;</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keyword">const</span> StreamType stream_type =</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  stream_states_[stream_index].info->stream_type();</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> </div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> is_video = stream_type == kStreamVideo;</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> </div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">return</span> is_video ? OnVideoSample(std::move(sample))</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  : OnNonVideoSample(<a class="code" href="../../d8/dcc/namespacestd.html">std</a>::move(sample));</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</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> Status CueAlignmentHandler::UseNewSyncPoint(</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  std::shared_ptr<const CueEvent> new_sync) {</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  hint_ = sync_points_->GetHint(new_sync->time_in_seconds);</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  DCHECK_GT(hint_, new_sync->time_in_seconds);</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> stream_index = 0; stream_index < stream_states_.size();</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  stream_index++) {</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  StreamState& stream = stream_states_[stream_index];</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  stream.cues.push_back(StreamData::FromCueEvent(stream_index, new_sync));</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  RETURN_IF_ERROR(RunThroughSamples(&stream));</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  }</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> }</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="keywordtype">bool</span> CueAlignmentHandler::EveryoneWaitingAtHint()<span class="keyword"> const </span>{</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> StreamState& stream_state : stream_states_) {</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">if</span> (stream_state.samples.empty()) {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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>  }</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> </div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span> Status CueAlignmentHandler::AcceptSample(std::unique_ptr<StreamData> sample,</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  StreamState* stream) {</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  DCHECK(sample);</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  DCHECK(sample->media_sample || sample->text_sample);</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  DCHECK(stream);</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span> </div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">// Need to cache the stream index as we will lose the pointer when we add</span></div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="comment">// the sample to the queue.</span></div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> stream_index = sample->stream_index;</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> </div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  stream->samples.push_back(std::move(sample));</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">if</span> (stream->samples.size() > kMaxBufferSize) {</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  LOG(ERROR) << <span class="stringliteral">"Stream "</span> << stream_index << <span class="stringliteral">" has buffered "</span></div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  << stream->samples.size() << <span class="stringliteral">" when the max is "</span></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  << kMaxBufferSize;</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">return</span> Status(error::INVALID_ARGUMENT,</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="stringliteral">"Streams are not properly multiplexed."</span>);</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  }</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span> </div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">return</span> RunThroughSamples(stream);</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span> }</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span> Status CueAlignmentHandler::RunThroughSamples(StreamState* stream) {</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="comment">// Step through all our samples until we find where we can insert the cue.</span></div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">// Think of this as a merge sort.</span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">while</span> (stream->cues.size() && stream->samples.size()) {</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> cue_time = stream->cues.front()->cue_event->time_in_seconds;</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> sample_time =</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  TimeInSeconds(*stream->info, *stream->samples.front());</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span> </div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">if</span> (sample_time < cue_time) {</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  RETURN_IF_ERROR(<a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(stream->samples.front())));</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  stream->samples.pop_front();</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  RETURN_IF_ERROR(<a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(stream->cues.front())));</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  stream->cues.pop_front();</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  }</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  }</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="comment">// If we still have samples, then it means that we sent out the cue and can</span></div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="comment">// now work up to the hint. So now send all samples that come before the hint</span></div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="comment">// downstream.</span></div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">while</span> (stream->samples.size() &&</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  TimeInSeconds(*stream->info, *stream->samples.front()) < hint_) {</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  RETURN_IF_ERROR(<a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">Dispatch</a>(std::move(stream->samples.front())));</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  stream->samples.pop_front();</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  }</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span> }</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span> } <span class="comment">// namespace shaka</span></div><div class="ttc" id="classshaka_1_1media_1_1MediaHandler_html_afe98a4fd19eabe0fc78afc91959c34a6"><div class="ttname"><a href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#afe98a4fd19eabe0fc78afc91959c34a6">shaka::media::MediaHandler::Dispatch</a></div><div class="ttdeci">Status Dispatch(std::unique_ptr< StreamData > stream_data) const</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/de9/media__handler_8cc_source.html#l00052">media_handler.cc:52</a></div></div>
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<div class="ttc" id="namespacestd_html"><div class="ttname"><a href="../../d8/dcc/namespacestd.html">std</a></div><div class="ttdoc">STL namespace. </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_1MediaHandler_html_ab644ca7b0a0dbcbc42936f2dfb979ca5"><div class="ttname"><a href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html#ab644ca7b0a0dbcbc42936f2dfb979ca5">shaka::media::MediaHandler::FlushAllDownstreams</a></div><div class="ttdeci">Status FlushAllDownstreams()</div><div class="ttdoc">Flush all connected downstream handlers. </div><div class="ttdef"><b>Definition:</b> <a href="../../d2/de9/media__handler_8cc_source.html#l00072">media_handler.cc:72</a></div></div>
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