80 lines
43 KiB
HTML
80 lines
43 KiB
HTML
<!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 1.8.13"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1"/>
|
|
<title>Shaka Packager SDK: packager/media/formats/webvtt/webvtt_parser.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/searchdata.js"></script>
|
|
<script type="text/javascript" src="../../search/search.js"></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 id="projectalign" style="padding-left: 0.5em;">
|
|
<div id="projectname">Shaka Packager SDK
|
|
</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<!-- Generated by Doxygen 1.8.13 -->
|
|
<script type="text/javascript">
|
|
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
|
|
</script>
|
|
<script type="text/javascript" src="../../menudata.js"></script>
|
|
<script type="text/javascript" src="../../menu.js"></script>
|
|
<script type="text/javascript">
|
|
$(function() {
|
|
initMenu('../../',true,false,'search.php','Search');
|
|
$(document).ready(function() { init_search(); });
|
|
});
|
|
</script>
|
|
<div id="main-nav"></div>
|
|
<!-- window showing the filter options -->
|
|
<div id="MSearchSelectWindow"
|
|
onmouseover="return searchBox.OnSearchSelectShow()"
|
|
onmouseout="return searchBox.OnSearchSelectHide()"
|
|
onkeydown="return searchBox.OnSearchSelectKey(event)">
|
|
</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_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_375ba2cfd8fd5b05c50b92d996b9d386.html">formats</a></li><li class="navelem"><a class="el" href="../../dir_7fa7c3de4a91b9652697b9f1c2d38e70.html">webvtt</a></li> </ul>
|
|
</div>
|
|
</div><!-- top -->
|
|
<div class="header">
|
|
<div class="headertitle">
|
|
<div class="title">webvtt_parser.cc</div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
<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><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/formats/webvtt/webvtt_parser.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 <string></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <vector></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/base/strings/string_split.h"</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/base/strings/string_util.h"</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/base/text_stream_info.h"</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/formats/webvtt/webvtt_timestamp.h"</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>media {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>{</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">const</span> uint64_t kStreamIndex = 0;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> std::string BlockToString(<span class="keyword">const</span> std::string* block, <span class="keywordtype">size_t</span> size) {</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  std::string out = <span class="stringliteral">" --- BLOCK START ---\n"</span>;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < size; i++) {</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  out.append(<span class="stringliteral">" "</span>);</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  out.append(block[i]);</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  out.append(<span class="stringliteral">"\n"</span>);</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  }</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  out.append(<span class="stringliteral">" --- BLOCK END ---"</span>);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">return</span> out;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> }</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="comment">// Comments are just blocks that are preceded by a blank line, start with the</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// word "NOTE" (followed by a space or newline), and end at the first blank</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// line.</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// SOURCE: https://www.w3.org/TR/webvtt1</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keywordtype">bool</span> IsLikelyNote(<span class="keyword">const</span> std::string& line) {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">return</span> line == <span class="stringliteral">"NOTE"</span> ||</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  base::StartsWith(line, <span class="stringliteral">"NOTE "</span>, base::CompareCase::SENSITIVE) ||</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  base::StartsWith(line, <span class="stringliteral">"NOTE\t"</span>, base::CompareCase::SENSITIVE);</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> }</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// As cue time is the only part of a WEBVTT file that is allowed to have</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// "-->" appear, then if the given line contains it, we can safely assume</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// that the line is likely to be a cue time.</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">bool</span> IsLikelyCueTiming(<span class="keyword">const</span> std::string& line) {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> line.find(<span class="stringliteral">"-->"</span>) != std::string::npos;</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> <span class="comment">// A WebVTT cue identifier is any sequence of one or more characters not</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">// containing the substring "-->" (U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS,</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment">// U+003E GREATER-THAN SIGN), nor containing any U+000A LINE FEED (LF)</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">// characters or U+000D CARRIAGE RETURN (CR) characters.</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// SOURCE: https://www.w3.org/TR/webvtt1/#webvtt-cue-identifier</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keywordtype">bool</span> MaybeCueId(<span class="keyword">const</span> std::string& line) {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> line.find(<span class="stringliteral">"-->"</span>) == std::string::npos;</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> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// Check to see if the block is likely a style block. Style blocks are</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// identified as any block that starts with a line that only contains</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// "STYLE".</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// SOURCE: https://w3c.github.io/webvtt/#styling</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keywordtype">bool</span> IsLikelyStyle(<span class="keyword">const</span> std::string& line) {</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> base::TrimWhitespaceASCII(line, base::TRIM_TRAILING) == <span class="stringliteral">"STYLE"</span>;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> }</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> <span class="comment">// Check to see if the block is likely a region block. Region blocks are</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// identified as any block that starts with a line that only contains</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// "REGION".</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// SOURCE: https://w3c.github.io/webvtt/#webvtt-region</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keywordtype">bool</span> IsLikelyRegion(<span class="keyword">const</span> std::string& line) {</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> base::TrimWhitespaceASCII(line, base::TRIM_TRAILING) == <span class="stringliteral">"REGION"</span>;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> WebVttParser::WebVttParser(std::unique_ptr<FileReader> source,</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">const</span> std::string& language)</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  : reader_(<a class="code" href="../../d8/dcc/namespacestd.html">std</a>::move(source)), language_(language) {}</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> Status WebVttParser::InitializeInternal() {</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> }</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="keywordtype">bool</span> WebVttParser::ValidateOutputStreamIndex(<span class="keywordtype">size_t</span> stream_index)<span class="keyword"> const </span>{</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// Only support one output</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> stream_index == kStreamIndex;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> Status WebVttParser::Run() {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> Parse()</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  ? FlushDownstream(kStreamIndex)</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  : Status(error::INTERNAL_ERROR,</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="stringliteral">"Failed to parse WebVTT source. See log for details."</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> </div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="keywordtype">void</span> WebVttParser::Cancel() {</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  keep_reading_ = <span class="keyword">false</span>;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> }</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="keywordtype">bool</span> WebVttParser::Parse() {</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  std::vector<std::string> block;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (!reader_.Next(&block)) {</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  LOG(ERROR) << <span class="stringliteral">"Failed to read WEBVTT HEADER - No blocks in source."</span>;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> </div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// Check the header. It is possible for a 0xFEFF BOM to come before the</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// header text.</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (block.size() != 1) {</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  LOG(ERROR) << <span class="stringliteral">"Failed to read WEBVTT header - "</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  << <span class="stringliteral">"block size should be 1 but was "</span> << block.size() << <span class="stringliteral">"."</span>;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  }</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span> (block[0] != <span class="stringliteral">"WEBVTT"</span> && block[0] != <span class="stringliteral">"\xEF\xBB\xBFWEBVTT"</span>) {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  LOG(ERROR) << <span class="stringliteral">"Failed to read WEBVTT header - should be WEBVTT but was "</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  << block[0];</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">return</span> <span class="keyword">false</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> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">const</span> Status send_stream_info_result = DispatchTextStreamInfo();</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> (send_stream_info_result != Status::OK) {</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  LOG(ERROR) << <span class="stringliteral">"Failed to send stream info down stream:"</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  << send_stream_info_result.error_message();</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">return</span> <span class="keyword">false</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> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordtype">bool</span> saw_cue = <span class="keyword">false</span>;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">while</span> (reader_.Next(&block) && keep_reading_) {</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">// NOTE</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">if</span> (IsLikelyNote(block[0])) {</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="comment">// We can safely ignore the whole block.</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">continue</span>;</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">// STYLE</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">if</span> (IsLikelyStyle(block[0])) {</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">if</span> (saw_cue) {</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  LOG(ERROR)</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  << <span class="stringliteral">"Found style block after seeing cue. Ignoring style block"</span>;</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  LOG(WARNING) << <span class="stringliteral">"Missing support for style blocks. Skipping block:\n"</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  << BlockToString(block.data(), block.size());</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">continue</span>;</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  }</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// REGION</span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">if</span> (IsLikelyRegion(block[0])) {</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">if</span> (saw_cue) {</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  LOG(ERROR)</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  << <span class="stringliteral">"Found region block after seeing cue. Ignoring region block"</span>;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  LOG(WARNING) << <span class="stringliteral">"Missing support for region blocks. Skipping block:\n"</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  << BlockToString(block.data(), block.size());</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordflow">continue</span>;</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> </div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="comment">// CUE with ID</span></div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordflow">if</span> (block.size() >= 2 && MaybeCueId(block[0]) &&</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  IsLikelyCueTiming(block[1]) && ParseCueWithId(block)) {</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  saw_cue = <span class="keyword">true</span>;</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">continue</span>;</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="comment">// CUE with no ID</span></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">if</span> (IsLikelyCueTiming(block[0]) && ParseCueWithNoId(block)) {</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  saw_cue = <span class="keyword">true</span>;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">continue</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> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  LOG(ERROR) << <span class="stringliteral">"Failed to determine block classification:\n"</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  << BlockToString(block.data(), block.size());</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> keep_reading_;</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> <span class="keywordtype">bool</span> WebVttParser::ParseCueWithNoId(<span class="keyword">const</span> std::vector<std::string>& block) {</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keyword">const</span> Status status = ParseCue(<span class="stringliteral">""</span>, block.data(), block.size());</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (!status.ok()) {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  LOG(ERROR) << <span class="stringliteral">"Failed to parse cue: "</span> << status.error_message();</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordflow">return</span> status.ok();</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span> }</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> </div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="keywordtype">bool</span> WebVttParser::ParseCueWithId(<span class="keyword">const</span> std::vector<std::string>& block) {</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keyword">const</span> Status status = ParseCue(block[0], block.data() + 1, block.size() - 1);</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (!status.ok()) {</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  LOG(ERROR) << <span class="stringliteral">"Failed to parse cue: "</span> << status.error_message();</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> status.ok();</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> }</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> Status WebVttParser::ParseCue(<span class="keyword">const</span> std::string& <span class="keywordtype">id</span>,</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keyword">const</span> std::string* block,</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordtype">size_t</span> block_size) {</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keyword">const</span> std::vector<std::string> time_and_style = base::SplitString(</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  block[0], <span class="stringliteral">" "</span>, base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span> </div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  uint64_t start_time = 0;</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  uint64_t end_time = 0;</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> parsed_time =</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  time_and_style.size() >= 3 && time_and_style[1] == <span class="stringliteral">"-->"</span> &&</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  WebVttTimestampToMs(time_and_style[0], &start_time) &&</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  WebVttTimestampToMs(time_and_style[2], &end_time);</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span> (!parsed_time) {</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">return</span> Status(</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  error::INTERNAL_ERROR,</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="stringliteral">"Could not parse start time, -->, and end time from "</span> + block[0]);</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</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="comment">// According to the WebVTT spec end time must be greater than the start time</span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="comment">// of the cue. Since we are seeing content with invalid times in the field, we</span></div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="comment">// are going to drop the cue instead of failing to package.</span></div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="comment">//</span></div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="comment">// For more context see:</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="comment">// - https://www.w3.org/TR/webvtt1/#webvtt-cue-timings</span></div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="comment">// - https://github.com/google/shaka-packager/issues/335</span></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">// - https://github.com/google/shaka-packager/issues/425</span></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">//</span></div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="comment">// Print a warning so that those packaging content can know that their</span></div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="comment">// content is not spec compliant.</span></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">if</span> (end_time <= start_time) {</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  LOG(WARNING) << <span class="stringliteral">"WebVTT input is not spec compliant. Start time ("</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  << start_time << <span class="stringliteral">") should be less than end time ("</span> << end_time</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  << <span class="stringliteral">"). Skipping webvtt cue:"</span></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  << BlockToString(block, block_size);</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> </div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">return</span> Status::OK;</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> </div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  std::shared_ptr<TextSample> sample = std::make_shared<TextSample>();</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  sample->set_id(<span class="keywordtype">id</span>);</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  sample->SetTime(start_time, end_time);</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span> </div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="comment">// The rest of time_and_style are the style tokens.</span></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 3; i < time_and_style.size(); i++) {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  sample->AppendStyle(time_and_style[i]);</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> </div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="comment">// The rest of the block is the payload.</span></div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i < block_size; i++) {</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  sample->AppendPayload(block[i]);</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> </div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordflow">return</span> DispatchTextSample(kStreamIndex, sample);</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> }</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> Status WebVttParser::DispatchTextStreamInfo() {</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> kTrackId = 0;</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="comment">// The resolution of timings are in milliseconds.</span></div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> kTimescale = 1000;</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <span class="comment">// The duration passed here is not very important. Also the whole file</span></div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="comment">// must be read before determining the real duration which doesn't</span></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">// work nicely with the current demuxer.</span></div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> kDuration = 0;</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> kWebVttCodecString[] = <span class="stringliteral">"wvtt"</span>;</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> kCodecConfig[] = <span class="stringliteral">""</span>;</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keyword">const</span> int64_t kNoWidth = 0;</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keyword">const</span> int64_t kNoHeight = 0;</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>  std::shared_ptr<StreamInfo> info = std::make_shared<TextStreamInfo>(</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  kTrackId, kTimescale, kDuration, kCodecWebVtt, kWebVttCodecString,</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  kCodecConfig, kNoWidth, kNoHeight, language_);</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>  <span class="keywordflow">return</span> DispatchStreamInfo(kStreamIndex, std::move(info));</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span> }</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> } <span class="comment">// namespace shaka</span></div><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>
|
|
<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>
|
|
</div><!-- fragment --></div><!-- contents -->
|
|
<!-- start footer part -->
|
|
<hr class="footer"/><address class="footer"><small>
|
|
Generated on Mon Aug 20 2018 10:46:49 for Shaka Packager SDK by  <a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="../../doxygen.png" alt="doxygen"/>
|
|
</a> 1.8.13
|
|
</small></address>
|
|
</body>
|
|
</html>
|