shaka-packager/docs/d8/d9a/fragmenter_8cc_source.html

302 lines
38 KiB
HTML
Raw Normal View History

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.6"/>
<title>DASH Media Packaging SDK: media/formats/mp4/fragmenter.cc Source File</title>
<link href="../../tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="../../jquery.js"></script>
<script type="text/javascript" src="../../dynsections.js"></script>
<link href="../../search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="../../search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="../../doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">DASH Media Packaging SDK
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.6 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
</script>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="../../index.html"><span>Main&#160;Page</span></a></li>
<li><a href="../../namespaces.html"><span>Namespaces</span></a></li>
<li><a href="../../annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="../../files.html"><span>Files</span></a></li>
<li>
<div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="../../search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="../../search/close.png" alt=""/></a>
</span>
</div>
</li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="../../files.html"><span>File&#160;List</span></a></li>
</ul>
</div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Enumerator</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="../../dir_39dc0668bd5a501998f94e8b4e546c71.html">media</a></li><li class="navelem"><a class="el" href="../../dir_65f7acfa8cf3a5f1edc11faa2428b914.html">formats</a></li><li class="navelem"><a class="el" href="../../dir_3e9291fd7a18fdecc763294cb2628910.html">mp4</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="headertitle">
<div class="title">fragmenter.cc</div> </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2014 Google Inc. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<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>&#160;<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>&#160;<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>&#160;</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp4/fragmenter.h&quot;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &lt;limits&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/buffer_writer.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/audio_stream_info.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/media_sample.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp4/box_definitions.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">namespace </span>mp4 {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="keyword">const</span> int64_t kInvalidTime = std::numeric_limits&lt;int64_t&gt;::max();</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;uint64_t GetSeekPreroll(<span class="keyword">const</span> StreamInfo&amp; stream_info) {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; <span class="keywordflow">if</span> (stream_info.stream_type() != kStreamAudio) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keyword">const</span> AudioStreamInfo&amp; audio_stream_info =</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; <span class="keyword">static_cast&lt;</span><span class="keyword">const </span>AudioStreamInfo&amp;<span class="keyword">&gt;</span>(stream_info);</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keywordflow">return</span> audio_stream_info.seek_preroll_ns();</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;}</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;} <span class="comment">// namespace</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a675d1d98629a3d10f9ef191b9e950a69"> 31</a></span>&#160;<a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a675d1d98629a3d10f9ef191b9e950a69">Fragmenter::Fragmenter</a>(scoped_refptr&lt;StreamInfo&gt; info, <a class="code" href="../../df/d7b/structshaka_1_1media_1_1mp4_1_1TrackFragment.html">TrackFragment</a>* traf)</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; : traf_(traf),</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; seek_preroll_(GetSeekPreroll(*info)),</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; fragment_initialized_(false),</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; fragment_finalized_(false),</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; fragment_duration_(0),</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; presentation_start_time_(kInvalidTime),</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; earliest_presentation_time_(kInvalidTime),</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; first_sap_time_(kInvalidTime) {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; DCHECK(traf);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;}</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;Fragmenter::~Fragmenter() {}</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a684c1f318ac05e85f4dbf373ea65b7ad"> 45</a></span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a684c1f318ac05e85f4dbf373ea65b7ad">Fragmenter::AddSample</a>(scoped_refptr&lt;MediaSample&gt; sample) {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; DCHECK(sample);</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; CHECK_GT(sample-&gt;duration(), 0);</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordflow">if</span> (!fragment_initialized_) {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> status = <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a">InitializeFragment</a>(sample-&gt;dts());</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordflow">if</span> (!status.ok())</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; }</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">if</span> (sample-&gt;side_data_size() &gt; 0)</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; LOG(WARNING) &lt;&lt; <span class="stringliteral">&quot;MP4 samples do not support side data. Side data ignored.&quot;</span>;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="comment">// Fill in sample parameters. It will be optimized later.</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; traf_-&gt;runs[0].sample_sizes.push_back(sample-&gt;data_size());</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; traf_-&gt;runs[0].sample_durations.push_back(sample-&gt;duration());</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; traf_-&gt;runs[0].sample_flags.push_back(</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; sample-&gt;is_key_frame() ? 0 : TrackFragmentHeader::kNonKeySampleMask);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; data_-&gt;AppendArray(sample-&gt;data(), sample-&gt;data_size());</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; fragment_duration_ += sample-&gt;duration();</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; int64_t pts = sample-&gt;pts();</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="comment">// Set |earliest_presentation_time_| to |pts| if |pts| is smaller or if it is</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="comment">// not yet initialized (kInvalidTime &gt; pts is always true).</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">if</span> (earliest_presentation_time_ &gt; pts)</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; earliest_presentation_time_ = pts;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; traf_-&gt;runs[0].sample_composition_time_offsets.push_back(pts - sample-&gt;dts());</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordflow">if</span> (pts != sample-&gt;dts())</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; traf_-&gt;runs[0].flags |= TrackFragmentRun::kSampleCompTimeOffsetsPresentMask;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; if (sample-&gt;is_key_frame()) {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">if</span> (first_sap_time_ == kInvalidTime)</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; first_sap_time_ = pts;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordflow">return</span> Status::OK;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160;}</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a"> 85</a></span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a">Fragmenter::InitializeFragment</a>(int64_t first_sample_dts) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; fragment_initialized_ = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; fragment_finalized_ = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; traf_-&gt;decode_time.decode_time = first_sample_dts;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; traf_-&gt;runs.clear();</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; traf_-&gt;runs.resize(1);</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; traf_-&gt;runs[0].flags = TrackFragmentRun::kDataOffsetPresentMask;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; traf_-&gt;sample_group_descriptions.clear();</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; traf_-&gt;sample_to_groups.clear();</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; traf_-&gt;header.sample_description_index = 1; <span class="comment">// 1-based.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; traf_-&gt;header.flags = TrackFragmentHeader::kDefaultBaseIsMoofMask |</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; TrackFragmentHeader::kSampleDescriptionIndexPresentMask;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; fragment_duration_ = 0;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; earliest_presentation_time_ = kInvalidTime;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; first_sap_time_ = kInvalidTime;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; data_.reset(<span class="keyword">new</span> <a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">BufferWriter</a>());</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">return</span> Status::OK;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;}</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;</div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a0295126af5e6b278a980021f43ae17ea"> 104</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a0295126af5e6b278a980021f43ae17ea">Fragmenter::FinalizeFragment</a>() {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="comment">// Optimize trun box.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; traf_-&gt;runs[0].sample_count = traf_-&gt;runs[0].sample_sizes.size();</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">OptimizeSampleEntries</a>(&amp;traf_-&gt;runs[0].sample_durations,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; &amp;traf_-&gt;header.default_sample_duration)) {</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; traf_-&gt;header.flags |=</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; TrackFragmentHeader::kDefaultSampleDurationPresentMask;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; traf_-&gt;runs[0].flags |= TrackFragmentRun::kSampleDurationPresentMask;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">OptimizeSampleEntries</a>(&amp;traf_-&gt;runs[0].sample_sizes,</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; &amp;traf_-&gt;header.default_sample_size)) {</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; traf_-&gt;header.flags |= TrackFragmentHeader::kDefaultSampleSizePresentMask;</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; traf_-&gt;runs[0].flags |= TrackFragmentRun::kSampleSizePresentMask;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">OptimizeSampleEntries</a>(&amp;traf_-&gt;runs[0].sample_flags,</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; &amp;traf_-&gt;header.default_sample_flags)) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; traf_-&gt;header.flags |= TrackFragmentHeader::kDefaultSampleFlagsPresentMask;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; traf_-&gt;runs[0].flags |= TrackFragmentRun::kSampleFlagsPresentMask;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// Add SampleToGroup boxes. A SampleToGroup box with grouping type of &#39;roll&#39;</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="comment">// needs to be added if there is seek preroll, referencing sample group</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="comment">// description in track level; Also need to add SampleToGroup boxes</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="comment">// correponding to every SampleGroupDescription boxes, referencing sample</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="comment">// group description in fragment level.</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; DCHECK_EQ(traf_-&gt;sample_to_groups.size(), 0u);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <span class="keywordflow">if</span> (seek_preroll_ &gt; 0) {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; traf_-&gt;sample_to_groups.resize(traf_-&gt;sample_to_groups.size() + 1);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; <a class="code" href="../../d0/d7c/structshaka_1_1media_1_1mp4_1_1SampleToGroup.html">SampleToGroup</a>&amp; sample_to_group = traf_-&gt;sample_to_groups.back();</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; sample_to_group.grouping_type = FOURCC_roll;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; sample_to_group.entries.resize(1);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <a class="code" href="../../d7/de0/structshaka_1_1media_1_1mp4_1_1SampleToGroupEntry.html">SampleToGroupEntry</a>&amp; sample_to_group_entry = sample_to_group.entries.back();</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; sample_to_group_entry.sample_count = traf_-&gt;runs[0].sample_count;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; sample_to_group_entry.group_description_index =</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; SampleToGroupEntry::kTrackGroupDescriptionIndexBase + 1;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>&amp; sample_group_description : traf_-&gt;sample_group_descriptions) {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; traf_-&gt;sample_to_groups.resize(traf_-&gt;sample_to_groups.size() + 1);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <a class="code" href="../../d0/d7c/structshaka_1_1media_1_1mp4_1_1SampleToGroup.html">SampleToGroup</a>&amp; sample_to_group = traf_-&gt;sample_to_groups.back();</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; sample_to_group.grouping_type = sample_group_description.grouping_type;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; sample_to_group.entries.resize(1);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <a class="code" href="../../d7/de0/structshaka_1_1media_1_1mp4_1_1SampleToGroupEntry.html">SampleToGroupEntry</a>&amp; sample_to_group_entry = sample_to_group.entries.back();</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; sample_to_group_entry.sample_count = traf_-&gt;runs[0].sample_count;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; sample_to_group_entry.group_description_index =</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; SampleToGroupEntry::kTrackFragmentGroupDescriptionIndexBase + 1;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; fragment_finalized_ = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; fragment_initialized_ = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;}</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;</div>
<div class="line"><a name="l00160"></a><span class="lineno"><a class="line" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#af1f1d56215c1e9543bfb516136862fa6"> 160</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#af1f1d56215c1e9543bfb516136862fa6">Fragmenter::GenerateSegmentReference</a>(<a class="code" href="../../dd/d9b/structshaka_1_1media_1_1mp4_1_1SegmentReference.html">SegmentReference</a>* reference) {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="comment">// NOTE: Daisy chain is not supported currently.</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; reference-&gt;reference_type = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; reference-&gt;subsegment_duration = fragment_duration_;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; reference-&gt;starts_with_sap = StartsWithSAP();</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; <span class="keywordflow">if</span> (kInvalidTime == first_sap_time_) {</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; reference-&gt;sap_type = SegmentReference::TypeUnknown;</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; reference-&gt;sap_delta_time = 0;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; reference-&gt;sap_type = SegmentReference::Type1;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; reference-&gt;sap_delta_time = first_sap_time_ - earliest_presentation_time_;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; }</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; reference-&gt;earliest_presentation_time = earliest_presentation_time_;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;}</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;<span class="keywordtype">bool</span> Fragmenter::StartsWithSAP() {</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; DCHECK(!traf_-&gt;runs.empty());</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; uint32_t start_sample_flag;</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keywordflow">if</span> (traf_-&gt;runs[0].flags &amp; TrackFragmentRun::kSampleFlagsPresentMask) {</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; DCHECK(!traf_-&gt;runs[0].sample_flags.empty());</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; start_sample_flag = traf_-&gt;runs[0].sample_flags[0];</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; DCHECK(traf_-&gt;header.flags &amp;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; TrackFragmentHeader::kDefaultSampleFlagsPresentMask);</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; start_sample_flag = traf_-&gt;header.default_sample_flags;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; <span class="keywordflow">return</span> (start_sample_flag &amp; TrackFragmentHeader::kNonKeySampleMask) == 0;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;}</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;} <span class="comment">// namespace mp4</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;} <span class="comment">// namespace shaka</span></div>
<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1SampleToGroupEntry_html"><div class="ttname"><a href="../../d7/de0/structshaka_1_1media_1_1mp4_1_1SampleToGroupEntry.html">shaka::media::mp4::SampleToGroupEntry</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00522">box_definitions.h:522</a></div></div>
<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1SegmentReference_html"><div class="ttname"><a href="../../dd/d9b/structshaka_1_1media_1_1mp4_1_1SegmentReference.html">shaka::media::mp4::SegmentReference</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00750">box_definitions.h:750</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a675d1d98629a3d10f9ef191b9e950a69"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a675d1d98629a3d10f9ef191b9e950a69">shaka::media::mp4::Fragmenter::Fragmenter</a></div><div class="ttdeci">Fragmenter(scoped_refptr&lt; StreamInfo &gt; info, TrackFragment *traf)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00031">fragmenter.cc:31</a></div></div>
<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1TrackFragment_html"><div class="ttname"><a href="../../df/d7b/structshaka_1_1media_1_1mp4_1_1TrackFragment.html">shaka::media::mp4::TrackFragment</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00728">box_definitions.h:728</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a684c1f318ac05e85f4dbf373ea65b7ad"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a684c1f318ac05e85f4dbf373ea65b7ad">shaka::media::mp4::Fragmenter::AddSample</a></div><div class="ttdeci">virtual Status AddSample(scoped_refptr&lt; MediaSample &gt; sample)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00045">fragmenter.cc:45</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_aa702c2af5ea5096d94f2943076a21e4a"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a">shaka::media::mp4::Fragmenter::InitializeFragment</a></div><div class="ttdeci">virtual Status InitializeFragment(int64_t first_sample_dts)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00085">fragmenter.cc:85</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1BufferWriter_html"><div class="ttname"><a href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">shaka::media::BufferWriter</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dd2/buffer__writer_8h_source.html#l00022">buffer_writer.h:22</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a0295126af5e6b278a980021f43ae17ea"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a0295126af5e6b278a980021f43ae17ea">shaka::media::mp4::Fragmenter::FinalizeFragment</a></div><div class="ttdeci">virtual void FinalizeFragment()</div><div class="ttdoc">Finalize and optimize the fragment. </div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00104">fragmenter.cc:104</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_af1f1d56215c1e9543bfb516136862fa6"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#af1f1d56215c1e9543bfb516136862fa6">shaka::media::mp4::Fragmenter::GenerateSegmentReference</a></div><div class="ttdeci">void GenerateSegmentReference(SegmentReference *reference)</div><div class="ttdoc">Fill reference with current fragment information. </div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00160">fragmenter.cc:160</a></div></div>
<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#l00075">status.h:75</a></div></div>
<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1SampleToGroup_html"><div class="ttname"><a href="../../d0/d7c/structshaka_1_1media_1_1mp4_1_1SampleToGroup.html">shaka::media::mp4::SampleToGroup</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00532">box_definitions.h:532</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a208b7b8dd83e73c4206469695a3216d4"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">shaka::media::mp4::Fragmenter::OptimizeSampleEntries</a></div><div class="ttdeci">bool OptimizeSampleEntries(std::vector&lt; T &gt; *entries, T *default_value)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/dd1/fragmenter_8h_source.html#l00092">fragmenter.h:92</a></div></div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Fri Jun 24 2016 01:03:12 for DASH Media Packaging SDK by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="../../doxygen.png" alt="doxygen"/>
</a> 1.8.6
</small></address>
</body>
</html>