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<div class="title">webm_webvtt_parser.cc</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 2014 The Chromium Authors. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "packager/media/formats/webm/webm_webvtt_parser.h"</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="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> </div>
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<div class="line"><a name="l00010"></a><span class="lineno"><a class="line" href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html#a4e6f754e4fba24f7ea77fd0db959908b"> 10</a></span> <span class="keywordtype">void</span> <a class="code" href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html#a4e6f754e4fba24f7ea77fd0db959908b">WebMWebVTTParser::Parse</a>(<span class="keyword">const</span> uint8_t* payload,</div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  <span class="keywordtype">int</span> payload_size,</div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  std::string* <span class="keywordtype">id</span>,</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  std::string* settings,</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  std::string* content) {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  <a class="code" href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html">WebMWebVTTParser</a> parser(payload, payload_size);</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  parser.<a class="code" href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html#a4e6f754e4fba24f7ea77fd0db959908b">Parse</a>(<span class="keywordtype">id</span>, settings, content);</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> }</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> WebMWebVTTParser::WebMWebVTTParser(<span class="keyword">const</span> uint8_t* payload, <span class="keywordtype">int</span> payload_size)</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  : ptr_(payload), ptr_end_(payload + payload_size) {}</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keywordtype">void</span> <a class="code" href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html#a4e6f754e4fba24f7ea77fd0db959908b">WebMWebVTTParser::Parse</a>(std::string* <span class="keywordtype">id</span>,</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  std::string* settings,</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  std::string* content) {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  ParseLine(<span class="keywordtype">id</span>);</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  ParseLine(settings);</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  content->assign(ptr_, ptr_end_);</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> }</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">bool</span> WebMWebVTTParser::GetByte(uint8_t* byte) {</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">if</span> (ptr_ >= ptr_end_)</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// indicates end-of-stream</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  *byte = *ptr_++;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> }</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="keywordtype">void</span> WebMWebVTTParser::UngetByte() {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  --ptr_;</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> </div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keywordtype">void</span> WebMWebVTTParser::ParseLine(std::string* line) {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  line->clear();</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// Consume characters from the stream, until we reach end-of-line.</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// The WebVTT spec states that lines may be terminated in any of the following</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// three ways:</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// LF</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// CR</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// CR LF</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// The spec is here:</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// http://wiki.webmproject.org/webm-metadata/temporal-metadata/webvtt-in-webm</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">enum</span> {</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  kLF = <span class="stringliteral">'\x0A'</span>,</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  kCR = <span class="stringliteral">'\x0D'</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  };</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">for</span> (;;) {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  uint8_t byte;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">if</span> (!GetByte(&byte) || byte == kLF)</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (byte == kCR) {</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">if</span> (GetByte(&byte) && byte != kLF)</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  UngetByte();</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  line->push_back(byte);</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  }</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> </div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebMWebVTTParser_html_a4e6f754e4fba24f7ea77fd0db959908b"><div class="ttname"><a href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html#a4e6f754e4fba24f7ea77fd0db959908b">shaka::media::WebMWebVTTParser::Parse</a></div><div class="ttdeci">static void Parse(const uint8_t *payload, int payload_size, std::string *id, std::string *settings, std::string *content)</div><div class="ttdoc">Utility function to parse the WebVTT cue from a byte stream. </div><div class="ttdef"><b>Definition:</b> <a href="../../d5/dc1/webm__webvtt__parser_8cc_source.html#l00010">webm_webvtt_parser.cc:10</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1WebMWebVTTParser_html"><div class="ttname"><a href="../../d4/d59/classshaka_1_1media_1_1WebMWebVTTParser.html">shaka::media::WebMWebVTTParser</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dbf/webm__webvtt__parser_8h_source.html#l00017">webm_webvtt_parser.h:17</a></div></div>
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