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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><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  data_msb_aligned <<= 1;</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  nbits--;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  }</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  }</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">return</span> (crc == 0);</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> }</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="keyword">namespace </span>media {</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="keyword">namespace </span>mp2t {</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> TsSectionPsi::TsSectionPsi()</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  : wait_for_pusi_(true),</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  leading_bytes_to_discard_(0) {</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> }</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> </div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> TsSectionPsi::~TsSectionPsi() {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keywordtype">bool</span> TsSectionPsi::Parse(<span class="keywordtype">bool</span> payload_unit_start_indicator,</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">const</span> uint8_t* buf,</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordtype">int</span> size) {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// Ignore partial PSI.</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (wait_for_pusi_ && !payload_unit_start_indicator)</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">if</span> (payload_unit_start_indicator) {</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">// Reset the state of the PSI section.</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  ResetPsiState();</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Update the state.</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  wait_for_pusi_ = <span class="keyword">false</span>;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  DCHECK_GE(size, 1);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordtype">int</span> pointer_field = buf[0];</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  leading_bytes_to_discard_ = pointer_field;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  buf++;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  size--;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  }</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// Discard some leading bytes if needed.</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">if</span> (leading_bytes_to_discard_ > 0) {</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">int</span> nbytes_to_discard = std::min(leading_bytes_to_discard_, size);</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  buf += nbytes_to_discard;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  size -= nbytes_to_discard;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  leading_bytes_to_discard_ -= nbytes_to_discard;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">if</span> (size == 0)</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// Add the data to the parser state.</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  psi_byte_queue_.Push(buf, size);</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordtype">int</span> raw_psi_size;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">const</span> uint8_t* raw_psi;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  psi_byte_queue_.Peek(&raw_psi, &raw_psi_size);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// Check whether we have enough data to start parsing.</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (raw_psi_size < 3)</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordtype">int</span> section_length =</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  ((<span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(raw_psi[1]) << 8) |</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  (<span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(raw_psi[2]))) & 0xfff;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">if</span> (section_length >= 1021)</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">int</span> psi_length = section_length + 3;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span> (raw_psi_size < psi_length) {</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// Don't throw an error when there is not enough data,</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// just wait for more data to come.</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// There should not be any trailing bytes after a PMT.</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Instead, the pointer field should be used to stuff bytes.</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  DVLOG_IF(1, raw_psi_size > psi_length)</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  << <span class="stringliteral">"Trailing bytes after a PSI section: "</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  << psi_length << <span class="stringliteral">" vs "</span> << raw_psi_size;</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// Verify the CRC.</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  RCHECK(IsCrcValid(raw_psi, psi_length));</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// Parse the PSI section.</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  BitReader bit_reader(raw_psi, raw_psi_size);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">bool</span> status = ParsePsiSection(&bit_reader);</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span> (status)</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  ResetPsiState();</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">return</span> status;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span> }</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="keywordtype">void</span> TsSectionPsi::Flush() {</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> }</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="keywordtype">void</span> TsSectionPsi::Reset() {</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  ResetPsiSection();</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  ResetPsiState();</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> }</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="keywordtype">void</span> TsSectionPsi::ResetPsiState() {</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  wait_for_pusi_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  psi_byte_queue_.Reset();</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  leading_bytes_to_discard_ = 0;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> } <span class="comment">// namespace mp2t</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span> } <span class="comment">// namespace shaka</span></div><div class="ttc" id="namespaceshaka_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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