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<li class="navelem"><a class="el" href="../../dir_39dc0668bd5a501998f94e8b4e546c71.html">media</a></li><li class="navelem"><a class="el" href="../../dir_ebd49ab0652c2e9158bbb57c55382729.html">trick_play</a></li> </ul>
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<div class="title">trick_play_handler.h</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 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 "packager/media/base/media_handler.h"</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="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// The stream data in trick play stream is not a simple duplicate. Some</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// information need to be updated, including trick_play_rate in</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// VideoStreamInfo, the duration in MediaSample (which makes sure there is no</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// gap between the media sample dts). Since the duration information can be</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// determined after getting the next media sample, a queue is used to cache the</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// input stream data before the next key frame.</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html"> 23</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="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>();</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  ~<a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html">TrickPlayHandler</a>() <span class="keyword">override</span>;</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="keywordtype">void</span> SetHandlerForMainStream(std::shared_ptr<MediaHandler> handler);</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">void</span> SetHandlerForTrickPlay(uint32_t trick_play_rate,</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  std::shared_ptr<MediaHandler> handler);</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>  <span class="keyword">protected</span>:</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#a3fd2fae199e0a9607e83e02724896c10">InitializeInternal</a>() <span class="keyword">override</span>;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#afdd13bb4e762c4b904ed75b268359757">Process</a>(std::unique_ptr<StreamData> stream_data) <span class="keyword">override</span>;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordtype">bool</span> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#addbe1be8281bceb8e84df865424dded3">ValidateOutputStreamIndex</a>(<span class="keywordtype">size_t</span> stream_index) <span class="keyword">const override</span>;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#a9a6c29c88fdeb667d5592142d6815bfa">OnFlushRequest</a>(<span class="keywordtype">size_t</span> input_stream_index) <span class="keyword">override</span>;</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">private</span>:</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">friend</span> <span class="keyword">class </span>TrickPlayHandlerTest;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="comment">// Returns true if the trick play handler has main stream output handler</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// connected, otherwise returns false.</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordtype">bool</span> HasMainStream();</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>  <span class="comment">// Process the cached stream data for one trick play stream.</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// The cached data is dispatched to the |output_stream_index|.</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> ProcessCachedStreamData(</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordtype">size_t</span> output_stream_index,</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  std::deque<std::shared_ptr<StreamData>>* cached_stream_data);</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="comment">// Process a single stream data. Depending on the stream data type, some</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// information needs to be updated.</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// Decoding timestamp for current key media sample. It is used for calculating</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// the duration of previous key media sample, to make sure there is no gap</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// between two key media samples.</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> ProcessOneStreamData(<span class="keywordtype">size_t</span> output_stream_index,</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keyword">const</span> std::shared_ptr<StreamData>& stream_data);</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>  <span class="comment">// Trick play rates. Note that there can be multiple trick play rates,</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// e.g., 2, 4 and 8. That means, one input video stream will generate 3</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// output trick play streams and original stream. Three trick play streams</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// are:</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// [key_frame_0, key_frame_2, key_frame_4, ...]</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// [key_frame_0, key_frame_4, key_frame_8,...]</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="comment">// [key_frame_0, key_frame_8, key_frame_16, ...].</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  std::vector<uint32_t> trick_play_rates_;</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>  <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="l00072"></a><span class="lineno"> 72</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="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  uint32_t total_key_frames_ = 0;</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// Num of frames received.</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  uint32_t total_frames_ = 0;</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">// End timestamp of the previous processed media_sample, which is |dts| +</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// |duration|. The duration of key frame in trick play stream is updated based</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// on this timestamp.</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  int64_t prev_sample_end_timestamp_ = 0;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="comment">// Record playback_rate for each trick play stream.</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  std::vector<uint32_t> playback_rates_;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// The data in output streams should be in the same order as in the input</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// stream. Cache the stream data before next key frame so that we can</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// determine the duration for the current key frame. Since one key frame may</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// be dispatched to different trick play stream, each trick play stream need</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// its own queue to handle the synchronization.</span></div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// TODO(hmchen): Use one queue and multiple iterators, instead of multiple</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// queues.</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  std::vector<std::deque<std::shared_ptr<StreamData>>> cached_stream_data_;</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> </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> } <span class="comment">// namespace shaka</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</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#l00023">trick_play_handler.h:23</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#l00071">media_handler.h:71</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1TrickPlayHandler_html_addbe1be8281bceb8e84df865424dded3"><div class="ttname"><a href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#addbe1be8281bceb8e84df865424dded3">shaka::media::TrickPlayHandler::ValidateOutputStreamIndex</a></div><div class="ttdeci">bool ValidateOutputStreamIndex(size_t stream_index) const override</div><div class="ttdoc">Validate if the stream at the specified index actually exists. </div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d87/trick__play__handler_8cc_source.html#l00135">trick_play_handler.cc:135</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1TrickPlayHandler_html_a9a6c29c88fdeb667d5592142d6815bfa"><div class="ttname"><a href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#a9a6c29c88fdeb667d5592142d6815bfa">shaka::media::TrickPlayHandler::OnFlushRequest</a></div><div class="ttdeci">Status OnFlushRequest(size_t input_stream_index) override</div><div class="ttdoc">Event handler for flush request at the specific input stream index. </div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d87/trick__play__handler_8cc_source.html#l00141">trick_play_handler.cc:141</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1Status_html"><div class="ttname"><a href="../../d0/d93/classshaka_1_1media_1_1Status.html">shaka::media::Status</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d13/status_8h_source.html#l00088">status.h:88</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1TrickPlayHandler_html_a3fd2fae199e0a9607e83e02724896c10"><div class="ttname"><a href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#a3fd2fae199e0a9607e83e02724896c10">shaka::media::TrickPlayHandler::InitializeInternal</a></div><div class="ttdeci">Status InitializeInternal() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d87/trick__play__handler_8cc_source.html#l00036">trick_play_handler.cc:36</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1TrickPlayHandler_html_afdd13bb4e762c4b904ed75b268359757"><div class="ttname"><a href="../../db/dea/classshaka_1_1media_1_1TrickPlayHandler.html#afdd13bb4e762c4b904ed75b268359757">shaka::media::TrickPlayHandler::Process</a></div><div class="ttdeci">Status Process(std::unique_ptr< StreamData > stream_data) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d87/trick__play__handler_8cc_source.html#l00052">trick_play_handler.cc:52</a></div></div>
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