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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> <span class="comment">// Copyright 2014 The Chromium Authors. All rights reserved.</span></div>
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<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>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// found in the LICENSE file.</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> </div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "packager/media/formats/mp2t/ts_section_pmt.h"</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 <map></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/logging.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/formats/mp2t/mp2t_common.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> TsSectionPmt::TsSectionPmt(<span class="keyword">const</span> RegisterPesCb& register_pes_cb)</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  : register_pes_cb_(register_pes_cb) {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> }</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> TsSectionPmt::~TsSectionPmt() {</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"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keywordtype">bool</span> TsSectionPmt::ParsePsiSection(BitReader* bit_reader) {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// Read up to |last_section_number|.</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordtype">int</span> table_id;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">int</span> section_syntax_indicator;</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="keywordtype">int</span> dummy_zero;</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">int</span> reserved;</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordtype">int</span> section_length;</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">int</span> program_number;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordtype">int</span> version_number;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordtype">int</span> current_next_indicator;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">int</span> section_number;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">int</span> last_section_number;</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  RCHECK(bit_reader->ReadBits(8, &table_id));</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  RCHECK(bit_reader->ReadBits(1, &section_syntax_indicator));</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  RCHECK(bit_reader->ReadBits(1, &dummy_zero));</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  RCHECK(bit_reader->ReadBits(2, &reserved));</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  RCHECK(bit_reader->ReadBits(12, &section_length));</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">int</span> section_start_marker = bit_reader->bits_available() / 8;</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  RCHECK(bit_reader->ReadBits(16, &program_number));</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  RCHECK(bit_reader->ReadBits(2, &reserved));</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  RCHECK(bit_reader->ReadBits(5, &version_number));</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  RCHECK(bit_reader->ReadBits(1, &current_next_indicator));</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  RCHECK(bit_reader->ReadBits(8, &section_number));</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  RCHECK(bit_reader->ReadBits(8, &last_section_number));</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>  <span class="comment">// Perform a few verifications:</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// - table ID should be 2 for a PMT.</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// - section_syntax_indicator should be one.</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// - section length should not exceed 1021.</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  RCHECK(table_id == 0x2);</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  RCHECK(section_syntax_indicator);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  RCHECK(!dummy_zero);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  RCHECK(section_length <= 1021);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  RCHECK(section_number == 0);</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  RCHECK(last_section_number == 0);</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="comment">// Read the end of the fixed length section.</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">int</span> pcr_pid;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">int</span> program_info_length;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  RCHECK(bit_reader->ReadBits(3, &reserved));</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  RCHECK(bit_reader->ReadBits(13, &pcr_pid));</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  RCHECK(bit_reader->ReadBits(4, &reserved));</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  RCHECK(bit_reader->ReadBits(12, &program_info_length));</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  RCHECK(program_info_length < 1024);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="comment">// Read the program info descriptor.</span></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// Defined in section 2.6 of ISO-13818.</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  RCHECK(bit_reader->SkipBits(8 * program_info_length));</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Read the ES description table.</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// The end of the PID map if 4 bytes away from the end of the section</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// (4 bytes = size of the CRC).</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordtype">int</span> pid_map_end_marker = section_start_marker - section_length + 4;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  std::map<int, int> pid_map;</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">while</span> (bit_reader->bits_available() > 8 * pid_map_end_marker) {</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordtype">int</span> stream_type;</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">int</span> reserved;</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">int</span> pid_es;</div>
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|
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">int</span> es_info_length;</div>
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|
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  RCHECK(bit_reader->ReadBits(8, &stream_type));</div>
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|
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  RCHECK(bit_reader->ReadBits(3, &reserved));</div>
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|
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  RCHECK(bit_reader->ReadBits(13, &pid_es));</div>
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|
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  RCHECK(bit_reader->ReadBits(4, &reserved));</div>
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|
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  RCHECK(bit_reader->ReadBits(12, &es_info_length));</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>  <span class="comment">// Do not register the PID right away.</span></div>
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|
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="comment">// Wait for the end of the section to be fully parsed</span></div>
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|
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">// to make sure there is no error.</span></div>
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|
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  pid_map.insert(std::pair<int, int>(pid_es, stream_type));</div>
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|
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Read the ES info descriptors.</span></div>
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|
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// Defined in section 2.6 of ISO-13818.</span></div>
|
|
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  RCHECK(bit_reader->SkipBits(8 * es_info_length));</div>
|
|
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</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>  <span class="comment">// Read the CRC.</span></div>
|
|
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">int</span> crc32;</div>
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|
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  RCHECK(bit_reader->ReadBits(32, &crc32));</div>
|
|
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Once the PMT has been proved to be correct, register the PIDs.</span></div>
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|
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">for</span> (std::map<int, int>::iterator it = pid_map.begin();</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  it != pid_map.end(); ++it)</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  register_pes_cb_.Run(it->first, it->second);</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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="keywordtype">void</span> TsSectionPmt::ResetPsiSection() {</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> } <span class="comment">// namespace shaka</span></div>
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Generated on Mon Oct 3 2016 18:13:33 for DASH Media Packaging SDK by  <a href="http://www.doxygen.org/index.html">
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<img class="footer" src="../../doxygen.png" alt="doxygen"/>
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</a> 1.8.6
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