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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2018 Google LLC 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_file_buffer.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 "packager/base/strings/stringprintf.h"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/media/base/text_sample.h"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/media/formats/webvtt/webvtt_timestamp.h"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>{</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* kHeader = <span class="stringliteral">"WEBVTT\n"</span>;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kTsTimescale = 90000;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> }</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> WebVttFileBuffer::WebVttFileBuffer(</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  uint32_t transport_stream_timestamp_offset_ms)</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  : transport_stream_timestamp_offset_(transport_stream_timestamp_offset_ms *</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  kTsTimescale / 1000) {</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="comment">// Make sure we start with the same state that we would end up with if</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// the caller reset our state.</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  Reset();</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> }</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keywordtype">void</span> WebVttFileBuffer::Reset() {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  sample_count_ = 0;</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>  buffer_.clear();</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  buffer_.append(kHeader);</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (transport_stream_timestamp_offset_ > 0) {</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// https://tools.ietf.org/html/rfc8216#section-3.5 WebVTT.</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  base::StringAppendF(&buffer_,</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="stringliteral">"X-TIMESTAMP-MAP=LOCAL:00:00:00.000,MPEGTS:%d\n"</span>,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  transport_stream_timestamp_offset_);</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  }</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  buffer_.append(<span class="stringliteral">"\n"</span>); <span class="comment">// end of header.</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> }</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keywordtype">void</span> WebVttFileBuffer::Append(<span class="keyword">const</span> TextSample& sample) {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  DCHECK_GT(buffer_.size(), 0u) << <span class="stringliteral">"The buffer should at least have a header"</span>;</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>  sample_count_++;</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// Ids are optional</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (sample.id().length()) {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  buffer_.append(sample.id());</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  buffer_.append(<span class="stringliteral">"\n"</span>); <span class="comment">// end of id</span></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">// Write the times that the sample elapses.</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  buffer_.append(MsToWebVttTimestamp(sample.start_time()));</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  buffer_.append(<span class="stringliteral">" --> "</span>);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  buffer_.append(MsToWebVttTimestamp(sample.EndTime()));</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// Settings are optional</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (sample.settings().length()) {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  buffer_.append(<span class="stringliteral">" "</span>);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  buffer_.append(sample.settings());</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  buffer_.append(<span class="stringliteral">"\n"</span>); <span class="comment">// end of time & settings</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  buffer_.append(sample.payload());</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  buffer_.append(<span class="stringliteral">"\n"</span>); <span class="comment">// end of payload</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  buffer_.append(<span class="stringliteral">"\n"</span>); <span class="comment">// end of sample</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="keywordtype">bool</span> WebVttFileBuffer::WriteTo(File* file) {</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  DCHECK(file);</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  DCHECK_GT(buffer_.size(), 0u) << <span class="stringliteral">"The buffer should at least have a header"</span>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> </div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> written = file->Write(buffer_.c_str(), buffer_.size());</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">if</span> (written < 0) {</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</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>  <span class="keywordflow">return</span> <span class="keyword">static_cast<</span><span class="keywordtype">size_t</span><span class="keyword">></span>(written) == buffer_.size();</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> }</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> } <span class="comment">// namespace shaka</span></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>
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