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<div class="title">adts_header.cc</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2014 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/formats/mp2t/adts_header.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/media/base/bit_reader.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/formats/mp2t/mp2t_common.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/formats/mpeg/adts_constants.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>shaka {</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> <span class="keyword">namespace </span>mp2t {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> AdtsHeader::AdtsHeader()</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  : valid_config_(false),</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  profile_(0),</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  sampling_frequency_index_(0),</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  channel_configuration_(0) {}</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a149fb9c7fa2718d719008af2dce8157f"> 23</a></span> <span class="keywordtype">size_t</span> AdtsHeader::GetAdtsFrameSize(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">size_t</span> num_bytes) {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">if</span> (num_bytes < 6)</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">return</span> ((static_cast<int>(data[5]) >> 5) |</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  (static_cast<int>(data[4]) << 3) |</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  ((static_cast<int>(data[3]) & 0x3) << 11));</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> </div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a107e1269d5f826583c1940fb50c8cf92"> 31</a></span> <span class="keywordtype">size_t</span> AdtsHeader::GetAdtsHeaderSize(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">size_t</span> num_bytes) {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">if</span> (num_bytes < 2)</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (data[1] & 0x01)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">return</span> kAdtsHeaderMinSize;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span> kAdtsHeaderMinSize + <span class="keyword">sizeof</span>(uint16_t); <span class="comment">// Header + CRC.</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> </div>
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<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a2e154d7423498baf8cd8888c70dcfca9"> 39</a></span> <span class="keywordtype">bool</span> AdtsHeader::Parse(<span class="keyword">const</span> uint8_t* adts_frame, <span class="keywordtype">size_t</span> adts_frame_size) {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  CHECK(adts_frame);</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>  valid_config_ = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">BitReader</a> frame(adts_frame, adts_frame_size);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// Verify frame starts with sync bits (0xfff).</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  uint32_t sync;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(12, &sync));</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  RCHECK(sync == 0xfff);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// Skip MPEG version and layer.</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7">SkipBits</a>(3));</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Get "protection absent" flag.</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  uint8_t protection_absent;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(1, &protection_absent));</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// Get profile.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(2, &profile_));</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="comment">// Get sampling frequency.</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(4, &sampling_frequency_index_));</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  RCHECK(sampling_frequency_index_ < kAdtsFrequencyTableSize);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="comment">// Skip private stream bit.</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7">SkipBits</a>(1));</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// Get number of audio channels.</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(3, &channel_configuration_));</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  RCHECK((channel_configuration_ > 0) &&</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  (channel_configuration_ < kAdtsNumChannelsTableSize));</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// Skip originality, home and copyright info.</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7">SkipBits</a>(4));</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// Verify that the frame size matches input parameters.</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  uint16_t frame_size;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(13, &frame_size));</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  RCHECK(frame_size == adts_frame_size);</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// Skip buffer fullness indicator.</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7">SkipBits</a>(11));</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  uint8_t num_blocks_minus_1;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  RCHECK(frame.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">ReadBits</a>(2, &num_blocks_minus_1));</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (num_blocks_minus_1) {</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  NOTIMPLEMENTED() << <span class="stringliteral">"ADTS frames with more than one data block "</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="stringliteral">"not supported."</span>;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  }</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  valid_config_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> }</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a5ca14cc4eb4a28906fe832ab263ba5a2"> 85</a></span> <span class="keywordtype">bool</span> AdtsHeader::GetAudioSpecificConfig(std::vector<uint8_t>* buffer)<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  DCHECK(buffer);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (!valid_config_)</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  buffer->resize(2);</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  (*buffer)[0] = ((profile_ + 1) << 3) | (sampling_frequency_index_ >> 1);</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  (*buffer)[1] = ((sampling_frequency_index_ & 1) << 7) |</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  (channel_configuration_ << 3);</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> }</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
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<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a156a3288ab974557e95dfaba72e6b479"> 97</a></span> uint8_t AdtsHeader::GetObjectType()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> profile_ + 1;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> }</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div>
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<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#afda9a7656576556af8ddec599d5d8d3b"> 101</a></span> uint32_t AdtsHeader::GetSamplingFrequency()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  DCHECK_LT(sampling_frequency_index_, kAdtsFrequencyTableSize);</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> kAdtsFrequencyTable[sampling_frequency_index_];</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> }</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
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<div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#aaa01e3eb1ce9d4400aedd202b04f7160"> 106</a></span> uint8_t AdtsHeader::GetNumChannels()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  DCHECK_GT(channel_configuration_, 0);</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  DCHECK_LT(channel_configuration_, kAdtsNumChannelsTableSize);</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> kAdtsNumChannelsTable[channel_configuration_];</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> }</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">shaka::media::BitReader</a></div><div class="ttdoc">A class to read bit streams. </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00017">bit_reader.h:17</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_ad72778b38786be93fa55aa983501010d"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#ad72778b38786be93fa55aa983501010d">shaka::media::BitReader::ReadBits</a></div><div class="ttdeci">bool ReadBits(int num_bits, T *out)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00035">bit_reader.h:35</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_a5c7e9d8cedb921042076770c8f6033d7"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a5c7e9d8cedb921042076770c8f6033d7">shaka::media::BitReader::SkipBits</a></div><div class="ttdeci">bool SkipBits(int num_bits)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00024">bit_reader.cc:24</a></div></div>
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