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<div class="title">trick_play_handler.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2017 Google Inc. All rights reserved.</span></div>
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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">#ifndef PACKAGER_MEDIA_BASE_TRICK_PLAY_HANDLER_H_</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor"></span><span class="preprocessor">#define PACKAGER_MEDIA_BASE_TRICK_PLAY_HANDLER_H_</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <list></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/media/base/media_handler.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">class </span>VideoStreamInfo;</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="l00022"></a><span class="lineno"> 22</span> <span class="comment">// The stream data in trick play streams are not simple duplicates. Some</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// information get changed (e.g. VideoStreamInfo.trick_play_factor).</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html"> 24</a></span> <span class="keyword">class </span><a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a> : <span class="keyword">public</span> <a class="code" href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html">MediaHandler</a> {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keyword">explicit</span> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>(uint32_t factor);</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>(<span class="keyword">const</span> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>&) = <span class="keyword">delete</span>;</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>& operator=(<span class="keyword">const</span> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>&) = <span class="keyword">delete</span>;</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>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> InitializeInternal() <span class="keyword">override</span>;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> Process(std::unique_ptr<StreamData> stream_data) <span class="keyword">override</span>;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> OnFlushRequest(<span class="keywordtype">size_t</span> input_stream_index) <span class="keyword">override</span>;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> OnStreamInfo(<span class="keyword">const</span> <a class="code" href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html">StreamInfo</a>& info);</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> OnSegmentInfo(std::shared_ptr<const SegmentInfo> info);</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> OnMediaSample(<span class="keyword">const</span> <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html">MediaSample</a>& sample);</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> OnTrickFrame(<span class="keyword">const</span> <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html">MediaSample</a>& sample);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keyword">const</span> uint32_t factor_;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  uint64_t total_frames_ = 0;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  uint64_t total_key_frames_ = 0;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  uint64_t total_trick_frames_ = 0;</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>  <span class="comment">// We cannot just send video info through as we need to calculate the play</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// rate using the first two trick play frames. This reference should only be</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// used to update the play back rate before video info is sent downstream.</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// After getting sent downstream, this should never be used.</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  std::shared_ptr<VideoStreamInfo> video_info_;</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>  <span class="comment">// We need to track the segment that most recently finished so that we can</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// extend its duration if there are empty segments.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  std::shared_ptr<SegmentInfo> previous_segment_;</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>  <span class="comment">// Since we are dropping frames, the time that those frames would have been</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// on screen need to be added to the frame before them. Keep a reference to</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// the most recent trick play frame so that we can grow its duration as we</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// drop other frames.</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  std::shared_ptr<MediaSample> previous_trick_frame_;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Since we cannot send messages downstream right away, keep a queue of</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// messages that need to be sent down. At the start, we use this to queue</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// messages until we can send out |video_info_|. To ensure messages are</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// kept in order, messages are only dispatched through this queue and never</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// directly.</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  std::list<std::unique_ptr<StreamData>> delayed_messages_;</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> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> } <span class="comment">// namespace shaka</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> <span class="preprocessor">#endif // PACKAGER_MEDIA_BASE_TRICK_PLAY_HANDLER_H_</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1TrickPlayHandler_html"><div class="ttname"><a href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">shaka::media::TrickPlayHandler</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/ddc/trick__play__handler_8h_source.html#l00024">trick_play_handler.h:24</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1StreamInfo_html"><div class="ttname"><a href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html">shaka::media::StreamInfo</a></div><div class="ttdoc">Abstract class holds stream information. </div><div class="ttdef"><b>Definition:</b> <a href="../../d8/daa/stream__info_8h_source.html#l00058">stream_info.h:58</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1MediaHandler_html"><div class="ttname"><a href="../../da/dfd/classshaka_1_1media_1_1MediaHandler.html">shaka::media::MediaHandler</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d93/media__handler_8h_source.html#l00128">media_handler.h:128</a></div></div>
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<div class="ttc" id="classshaka_1_1Status_html"><div class="ttname"><a href="../../d2/d20/classshaka_1_1Status.html">shaka::Status</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d13/status_8h_source.html#l00110">status.h:110</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1MediaSample_html"><div class="ttname"><a href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html">shaka::media::MediaSample</a></div><div class="ttdoc">Class to hold a media sample. </div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d80/media__sample_8h_source.html#l00022">media_sample.h:22</a></div></div>
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