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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 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/codecs/ac3_audio_util.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/string_number_conversions.h"</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/media/base/bit_reader.h"</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/media/base/rcheck.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> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </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="comment">// ASTC Standard A/52:2012 Table 5.8 Audio Coding Mode.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">const</span> uint8_t kAc3NumChannelsTable[] = {2, 1, 2, 3, 3, 4, 4, 5};</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keywordtype">bool</span> ExtractAc3Data(<span class="keyword">const</span> std::vector<uint8_t>& ac3_data,</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  uint8_t* audio_coding_mode,</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordtype">bool</span>* lfe_channel_on) {</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  BitReader bit_reader(ac3_data.data(), ac3_data.size());</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="comment">// fscod: 2 bits</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// bsid: 5 bits</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// bsmod: 3 bits</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="comment">// acmod: 3 bits</span></div><div class="line"><a name="l00030"></a><span
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