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<div class="title">ts_section_pmt.cc</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<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>&#160;<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>&#160;<span class="comment">// found in the LICENSE file.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp2t/ts_section_pmt.h&quot;</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &lt;map&gt;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &quot;packager/base/logging.h&quot;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/bit_reader.h&quot;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp2t/mp2t_common.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="keyword">namespace </span>mp2t {</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;TsSectionPmt::TsSectionPmt(<span class="keyword">const</span> RegisterPesCb&amp; register_pes_cb)</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; : register_pes_cb_(register_pes_cb) {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;}</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;TsSectionPmt::~TsSectionPmt() {</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;}</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="keywordtype">bool</span> TsSectionPmt::ParsePsiSection(BitReader* bit_reader) {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="comment">// Read up to |last_section_number|.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; <span class="keywordtype">int</span> table_id;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="keywordtype">int</span> section_syntax_indicator;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; <span class="keywordtype">int</span> dummy_zero;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; <span class="keywordtype">int</span> reserved;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keywordtype">int</span> section_length;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; <span class="keywordtype">int</span> program_number;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keywordtype">int</span> version_number;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordtype">int</span> current_next_indicator;</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keywordtype">int</span> section_number;</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keywordtype">int</span> last_section_number;</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; RCHECK(bit_reader-&gt;ReadBits(8, &amp;table_id));</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; RCHECK(bit_reader-&gt;ReadBits(1, &amp;section_syntax_indicator));</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; RCHECK(bit_reader-&gt;ReadBits(1, &amp;dummy_zero));</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; RCHECK(bit_reader-&gt;ReadBits(2, &amp;reserved));</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; RCHECK(bit_reader-&gt;ReadBits(12, &amp;section_length));</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordtype">int</span> section_start_marker = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(bit_reader-&gt;bits_available()) / 8;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; RCHECK(bit_reader-&gt;ReadBits(16, &amp;program_number));</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; RCHECK(bit_reader-&gt;ReadBits(2, &amp;reserved));</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; RCHECK(bit_reader-&gt;ReadBits(5, &amp;version_number));</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; RCHECK(bit_reader-&gt;ReadBits(1, &amp;current_next_indicator));</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; RCHECK(bit_reader-&gt;ReadBits(8, &amp;section_number));</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; RCHECK(bit_reader-&gt;ReadBits(8, &amp;last_section_number));</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="comment">// Perform a few verifications:</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="comment">// - table ID should be 2 for a PMT.</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="comment">// - section_syntax_indicator should be one.</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="comment">// - section length should not exceed 1021.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; RCHECK(table_id == 0x2);</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; RCHECK(section_syntax_indicator);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; RCHECK(!dummy_zero);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; RCHECK(section_length &lt;= 1021);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; RCHECK(section_number == 0);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; RCHECK(last_section_number == 0);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="comment">// Read the end of the fixed length section.</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keywordtype">int</span> pcr_pid;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordtype">int</span> program_info_length;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; RCHECK(bit_reader-&gt;ReadBits(3, &amp;reserved));</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; RCHECK(bit_reader-&gt;ReadBits(13, &amp;pcr_pid));</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; RCHECK(bit_reader-&gt;ReadBits(4, &amp;reserved));</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; RCHECK(bit_reader-&gt;ReadBits(12, &amp;program_info_length));</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; RCHECK(program_info_length &lt; 1024);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="comment">// Read the program info descriptor.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="comment">// Defined in section 2.6 of ISO-13818.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; RCHECK(bit_reader-&gt;SkipBits(8 * program_info_length));</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="comment">// Read the ES description table.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="comment">// The end of the PID map if 4 bytes away from the end of the section</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="comment">// (4 bytes = size of the CRC).</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordtype">int</span> pid_map_end_marker = section_start_marker - section_length + 4;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; std::map&lt;int, int&gt; pid_map;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">while</span> (static_cast&lt;int&gt;(bit_reader-&gt;bits_available()) &gt;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; 8 * pid_map_end_marker) {</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordtype">int</span> stream_type;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="keywordtype">int</span> reserved;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordtype">int</span> pid_es;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordtype">int</span> es_info_length;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; RCHECK(bit_reader-&gt;ReadBits(8, &amp;stream_type));</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; RCHECK(bit_reader-&gt;ReadBits(3, &amp;reserved));</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; RCHECK(bit_reader-&gt;ReadBits(13, &amp;pid_es));</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; RCHECK(bit_reader-&gt;ReadBits(4, &amp;reserved));</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; RCHECK(bit_reader-&gt;ReadBits(12, &amp;es_info_length));</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="comment">// Do not register the PID right away.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="comment">// Wait for the end of the section to be fully parsed</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="comment">// to make sure there is no error.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; pid_map.insert(std::pair&lt;int, int&gt;(pid_es, stream_type));</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="comment">// Read the ES info descriptors.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="comment">// Defined in section 2.6 of ISO-13818.</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; RCHECK(bit_reader-&gt;SkipBits(8 * es_info_length));</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="comment">// Read the CRC.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordtype">int</span> crc32;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; RCHECK(bit_reader-&gt;ReadBits(32, &amp;crc32));</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; <span class="comment">// Once the PMT has been proved to be correct, register the PIDs.</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordflow">for</span> (std::map&lt;int, int&gt;::iterator it = pid_map.begin();</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; it != pid_map.end(); ++it)</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; register_pes_cb_.Run(it-&gt;first, it-&gt;second);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;}</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="keywordtype">void</span> TsSectionPmt::ResetPsiSection() {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;}</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;} <span class="comment">// namespace mp2t</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;} <span class="comment">// namespace shaka</span></div>
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