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<title>Shaka Packager SDK: packager/media/formats/mp2t/ts_section_psi.cc Source File</title>
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2015-10-16 00:33:37 +00:00
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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_375ba2cfd8fd5b05c50b92d996b9d386.html">formats</a></li><li class="navelem"><a class="el" href="../../dir_35c1fdffcdd4ade6d7f948073ab165de.html">mp2t</a></li> </ul>
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<div class="title">ts_section_psi.cc</div> </div>
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2018-02-10 23:37:42 +00:00
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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><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><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "packager/media/formats/mp2t/ts_section_psi.h"</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 <stdint.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 <algorithm></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/base/logging.h"</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/media/base/bit_reader.h"</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/media/formats/mp2t/mp2t_common.h"</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> IsCrcValid(<span class="keyword">const</span> uint8_t* buf, <span class="keywordtype">int</span> size) {</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  uint32_t crc = 0xffffffffu;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  <span class="keyword">const</span> uint32_t kCrcPoly = 0x4c11db7;</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>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> k = 0; k < size; k++) {</div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  <span class="keywordtype">int</span> nbits = 8;</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  uint32_t data_msb_aligned = buf[k];</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  data_msb_aligned <<= (32 - nbits);</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">while</span> (nbits > 0) {</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">if</span> ((data_msb_aligned ^ crc) & 0x80000000) {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  crc <<= 1;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  crc ^= kCrcPoly;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  crc <<= 1;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  }</div><div class="line"><a name="l00031"></a><sp
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