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<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_64597db6ac7a9160e951a4226a03f10e.html">codecs</a></li> </ul>
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<div class="title">ac3_audio_util.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 2018 Google Inc. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<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>
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<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>
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<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>
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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="preprocessor">#include "packager/media/codecs/ac3_audio_util.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
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<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>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/media/base/bit_reader.h"</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/media/base/rcheck.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div>
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<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>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>{</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> <span class="comment">// ASTC Standard A/52:2012 Table 5.8 Audio Coding Mode.</span></div>
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<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>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  </div>
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<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>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  uint8_t* audio_coding_mode,</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keywordtype">bool</span>* lfe_channel_on) {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  BitReader bit_reader(ac3_data.data(), ac3_data.size());</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// fscod: 2 bits</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// bsid: 5 bits</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// bsmod: 3 bits</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="comment">// acmod: 3 bits</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="comment">// lfeon: 1 bit</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="comment">// bit_rate_code: 5 bits</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  RCHECK(bit_reader.SkipBits(10));</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  RCHECK(bit_reader.ReadBits(3, audio_coding_mode));</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  RCHECK(bit_reader.ReadBits(1, lfe_channel_on));</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="comment">// namespace</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keywordtype">size_t</span> GetAc3NumChannels(<span class="keyword">const</span> std::vector<uint8_t>& ac3_data) {</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  uint8_t audio_coding_mode;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordtype">bool</span> lfe_channel_on;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (!ExtractAc3Data(ac3_data, &audio_coding_mode, &lfe_channel_on)) {</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  LOG(WARNING) << <span class="stringliteral">"Seeing invalid AC3 data: "</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  << base::HexEncode(ac3_data.data(), ac3_data.size());</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">return</span> kAc3NumChannelsTable[audio_coding_mode] + (lfe_channel_on ? 1 : 0);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> } <span class="comment">// namespace shaka</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="anamespaceshaka_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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