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<div class="title">ts_section_pes.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_pes.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 "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include "packager/base/strings/string_number_conversions.h"</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/base/timestamp.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/es_parser.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/media/formats/mp2t/mp2t_common.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kPesStartCode = 0x000001;</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Given that |time| is coded using 33 bits,</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// UnrollTimestamp returns the corresponding unrolled timestamp.</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// The unrolled timestamp is defined by:</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">// |time| + k * (2 ^ 33)</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// where k is estimated so that the unrolled timestamp</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// is as close as possible to |previous_unrolled_time|.</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">static</span> int64_t UnrollTimestamp(int64_t previous_unrolled_time, int64_t time) {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="comment">// Mpeg2 TS timestamps have an accuracy of 33 bits.</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> nbits = 33;</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// |timestamp| has a precision of |nbits|</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// so make sure the highest bits are set to 0.</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  DCHECK_EQ((time >> nbits), 0);</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>  <span class="comment">// Consider 3 possibilities to estimate the missing high bits of |time|.</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  int64_t previous_unrolled_time_high = (previous_unrolled_time >> nbits);</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  int64_t time0 = ((previous_unrolled_time_high - 1) << nbits) | time;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  int64_t time1 = ((previous_unrolled_time_high + 0) << nbits) | time;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  int64_t time2 = ((previous_unrolled_time_high + 1) << nbits) | time;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="comment">// Select the min absolute difference with the current time</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// so as to ensure time continuity.</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  int64_t diff0 = time0 - previous_unrolled_time;</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  int64_t diff1 = time1 - previous_unrolled_time;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  int64_t diff2 = time2 - previous_unrolled_time;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">if</span> (diff0 < 0)</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  diff0 = -diff0;</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordflow">if</span> (diff1 < 0)</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  diff1 = -diff1;</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (diff2 < 0)</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  diff2 = -diff2;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  int64_t unrolled_time;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  int64_t min_diff;</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">if</span> (diff1 < diff0) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  unrolled_time = time1;</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  min_diff = diff1;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  unrolled_time = time0;</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  min_diff = diff0;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  }</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">if</span> (diff2 < min_diff)</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  unrolled_time = time2;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> unrolled_time;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> IsTimestampSectionValid(int64_t timestamp_section) {</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="comment">// |pts_section| has 40 bits:</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="comment">// - starting with either '0010' or '0011' or '0001'</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="comment">// - and ending with a marker bit.</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// See ITU H.222 standard - PES section.</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">// Verify that all the marker bits are set to one.</span></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">return</span> ((timestamp_section & 0x1) != 0) &&</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  ((timestamp_section & 0x10000) != 0) &&</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  ((timestamp_section & 0x100000000LL) != 0);</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> </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">static</span> int64_t ConvertTimestampSectionToTimestamp(int64_t timestamp_section) {</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> (((timestamp_section >> 33) & 0x7) << 30) |</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  (((timestamp_section >> 17) & 0x7fff) << 15) |</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  (((timestamp_section >> 1) & 0x7fff) << 0);</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> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="keyword">namespace </span>mp2t {</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"> 85</span> TsSectionPes::TsSectionPes(std::unique_ptr<EsParser> es_parser)</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  : es_parser_(es_parser.release()),</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  wait_for_pusi_(true),</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  previous_pts_valid_(false),</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  previous_pts_(0),</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  previous_dts_valid_(false),</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  previous_dts_(0) {</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  DCHECK(es_parser_);</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> }</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> TsSectionPes::~TsSectionPes() {</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"> 97</span> </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="keywordtype">bool</span> TsSectionPes::Parse(<span class="keywordtype">bool</span> payload_unit_start_indicator,</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">const</span> uint8_t* buf,</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordtype">int</span> size) {</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// Ignore partial PES.</span></div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">if</span> (wait_for_pusi_ && !payload_unit_start_indicator)</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</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>  <span class="keywordtype">bool</span> parse_result = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (payload_unit_start_indicator) {</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// Try emitting a packet since we might have a pending PES packet</span></div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// with an undefined size.</span></div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// In this case, a unit is emitted when the next unit is coming.</span></div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordtype">int</span> raw_pes_size;</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">const</span> uint8_t* raw_pes;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  pes_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">Peek</a>(&raw_pes, &raw_pes_size);</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (raw_pes_size > 0)</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  parse_result = Emit(<span class="keyword">true</span>);</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> </div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// Reset the state.</span></div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  ResetPesState();</div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// Update the state.</span></div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  wait_for_pusi_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</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>  <span class="comment">// Add the data to the parser state.</span></div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">if</span> (size > 0)</div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  pes_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2">Push</a>(buf, size);</div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// Try emitting the current PES packet.</span></div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">return</span> (parse_result && Emit(<span class="keyword">false</span>));</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> }</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="keywordtype">void</span> TsSectionPes::Flush() {</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// Try emitting a packet since we might have a pending PES packet</span></div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// with an undefined size.</span></div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  Emit(<span class="keyword">true</span>);</div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="comment">// Flush the underlying ES parser.</span></div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  es_parser_->Flush();</div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> }</div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="keywordtype">void</span> TsSectionPes::Reset() {</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  ResetPesState();</div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  previous_pts_valid_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  previous_pts_ = 0;</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  previous_dts_valid_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  previous_dts_ = 0;</div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  es_parser_->Reset();</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> }</div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="keywordtype">bool</span> TsSectionPes::Emit(<span class="keywordtype">bool</span> emit_for_unknown_size) {</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordtype">int</span> raw_pes_size;</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keyword">const</span> uint8_t* raw_pes;</div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  pes_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">Peek</a>(&raw_pes, &raw_pes_size);</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="comment">// A PES should be at least 6 bytes.</span></div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="comment">// Wait for more data to come if not enough bytes.</span></div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (raw_pes_size < 6)</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// Check whether we have enough data to start parsing.</span></div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordtype">int</span> pes_packet_length =</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  (<span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(raw_pes[4]) << 8) |</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  (<span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(raw_pes[5]));</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> ((pes_packet_length == 0 && !emit_for_unknown_size) ||</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  (pes_packet_length != 0 && raw_pes_size < pes_packet_length + 6)) {</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// Wait for more data to come either because:</span></div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="comment">// - there are not enough bytes,</span></div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// - or the PES size is unknown and the "force emit" flag is not set.</span></div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// (PES size might be unknown for video PES packet).</span></div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  DVLOG(LOG_LEVEL_PES) << <span class="stringliteral">"pes_packet_length="</span> << pes_packet_length;</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// Parse the packet.</span></div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordtype">bool</span> parse_result = ParseInternal(raw_pes, raw_pes_size);</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="comment">// Reset the state.</span></div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  ResetPesState();</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">return</span> parse_result;</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> }</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="keywordtype">bool</span> TsSectionPes::ParseInternal(<span class="keyword">const</span> uint8_t* raw_pes, <span class="keywordtype">int</span> raw_pes_size) {</div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  BitReader bit_reader(raw_pes, raw_pes_size);</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> </div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// Read up to the pes_packet_length (6 bytes).</span></div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordtype">int</span> packet_start_code_prefix;</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordtype">int</span> stream_id;</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordtype">int</span> pes_packet_length;</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  RCHECK(bit_reader.ReadBits(24, &packet_start_code_prefix));</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  RCHECK(bit_reader.ReadBits(8, &stream_id));</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  RCHECK(bit_reader.ReadBits(16, &pes_packet_length));</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> </div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  RCHECK(packet_start_code_prefix == kPesStartCode);</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  DVLOG(LOG_LEVEL_PES) << <span class="stringliteral">"stream_id="</span> << std::hex << stream_id << std::dec;</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">if</span> (pes_packet_length == 0)</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  pes_packet_length = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(bit_reader.bits_available()) / 8;</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// Ignore the PES for unknown stream IDs.</span></div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// See ITU H.222 Table 2-22 "Stream_id assignments"</span></div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordtype">bool</span> is_audio_stream_id = ((stream_id & 0xe0) == 0xc0);</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordtype">bool</span> is_video_stream_id = ((stream_id & 0xf0) == 0xe0);</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">if</span> (!is_audio_stream_id && !is_video_stream_id)</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> </div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="comment">// Read up to "pes_header_data_length".</span></div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordtype">int</span> dummy_2;</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordtype">int</span> PES_scrambling_control;</div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordtype">int</span> PES_priority;</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordtype">int</span> data_alignment_indicator;</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordtype">int</span> copyright;</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordtype">int</span> original_or_copy;</div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordtype">int</span> pts_dts_flags;</div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordtype">int</span> escr_flag;</div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordtype">int</span> es_rate_flag;</div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordtype">int</span> dsm_trick_mode_flag;</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordtype">int</span> additional_copy_info_flag;</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keywordtype">int</span> pes_crc_flag;</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordtype">int</span> pes_extension_flag;</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordtype">int</span> pes_header_data_length;</div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  RCHECK(bit_reader.ReadBits(2, &dummy_2));</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  RCHECK(dummy_2 == 0x2);</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  RCHECK(bit_reader.ReadBits(2, &PES_scrambling_control));</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  RCHECK(bit_reader.ReadBits(1, &PES_priority));</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  RCHECK(bit_reader.ReadBits(1, &data_alignment_indicator));</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  RCHECK(bit_reader.ReadBits(1, &copyright));</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  RCHECK(bit_reader.ReadBits(1, &original_or_copy));</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  RCHECK(bit_reader.ReadBits(2, &pts_dts_flags));</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  RCHECK(bit_reader.ReadBits(1, &escr_flag));</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  RCHECK(bit_reader.ReadBits(1, &es_rate_flag));</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  RCHECK(bit_reader.ReadBits(1, &dsm_trick_mode_flag));</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  RCHECK(bit_reader.ReadBits(1, &additional_copy_info_flag));</div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  RCHECK(bit_reader.ReadBits(1, &pes_crc_flag));</div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  RCHECK(bit_reader.ReadBits(1, &pes_extension_flag));</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  RCHECK(bit_reader.ReadBits(8, &pes_header_data_length));</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordtype">int</span> pes_header_start_size = <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(bit_reader.bits_available()) / 8;</div>
|
|
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
|
|
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="comment">// Compute the size and the offset of the ES payload.</span></div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="comment">// "6" for the 6 bytes read before and including |pes_packet_length|.</span></div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="comment">// "3" for the 3 bytes read before and including |pes_header_data_length|.</span></div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="keywordtype">int</span> es_size = pes_packet_length - 3 - pes_header_data_length;</div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordtype">int</span> es_offset = 6 + 3 + pes_header_data_length;</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  RCHECK(es_size >= 0);</div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  RCHECK(es_offset + es_size <= raw_pes_size);</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">// Read the timing information section.</span></div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keywordtype">bool</span> is_pts_valid = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordtype">bool</span> is_dts_valid = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  int64_t pts_section = 0;</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  int64_t dts_section = 0;</div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordflow">if</span> (pts_dts_flags == 0x2) {</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  RCHECK(bit_reader.ReadBits(40, &pts_section));</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  RCHECK((((pts_section >> 36) & 0xf) == 0x2) &&</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  IsTimestampSectionValid(pts_section));</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  is_pts_valid = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  }</div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordflow">if</span> (pts_dts_flags == 0x3) {</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  RCHECK(bit_reader.ReadBits(40, &pts_section));</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  RCHECK(bit_reader.ReadBits(40, &dts_section));</div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  RCHECK((((pts_section >> 36) & 0xf) == 0x3) &&</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  IsTimestampSectionValid(pts_section));</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  RCHECK((((dts_section >> 36) & 0xf) == 0x1) &&</div>
|
|
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  IsTimestampSectionValid(dts_section));</div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  is_pts_valid = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  is_dts_valid = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div>
|
|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> </div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">// Convert and unroll the timestamps.</span></div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  int64_t media_pts(kNoTimestamp);</div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  int64_t media_dts(kNoTimestamp);</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">if</span> (is_pts_valid) {</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  int64_t pts = ConvertTimestampSectionToTimestamp(pts_section);</div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">if</span> (previous_pts_valid_)</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  pts = UnrollTimestamp(previous_pts_, pts);</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  previous_pts_ = pts;</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  previous_pts_valid_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  media_pts = pts;</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  }</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span> (is_dts_valid) {</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  int64_t dts = ConvertTimestampSectionToTimestamp(dts_section);</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">if</span> (previous_dts_valid_)</div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  dts = UnrollTimestamp(previous_dts_, dts);</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  previous_dts_ = dts;</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  previous_dts_valid_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  media_dts = dts;</div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  }</div>
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<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div>
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<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="comment">// Discard the rest of the PES packet header.</span></div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  DCHECK_EQ(bit_reader.bits_available() % 8, 0u);</div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordtype">int</span> pes_header_remaining_size =</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  pes_header_data_length -</div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  (pes_header_start_size -</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(bit_reader.bits_available()) / 8);</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  RCHECK(pes_header_remaining_size >= 0);</div>
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<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div>
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="comment">// Read the PES packet.</span></div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  DVLOG(LOG_LEVEL_PES)</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  << <span class="stringliteral">"Emit a reassembled PES:"</span></div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  << <span class="stringliteral">" size="</span> << es_size</div>
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<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  << <span class="stringliteral">" pts="</span> << media_pts</div>
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  << <span class="stringliteral">" dts="</span> << media_dts</div>
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  << <span class="stringliteral">" data_alignment_indicator="</span> << data_alignment_indicator;</div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">return</span> es_parser_->Parse(&raw_pes[es_offset], es_size, media_pts, media_dts);</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> }</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="keywordtype">void</span> TsSectionPes::ResetPesState() {</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  pes_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84">Reset</a>();</div>
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  wait_for_pusi_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> }</div>
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div>
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_acea792e406efe5119cec2e3e522e02c2"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2">shaka::media::ByteQueue::Push</a></div><div class="ttdeci">void Push(const uint8_t *data, int size)</div><div class="ttdoc">Append new bytes to the end of the queue. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00029">byte_queue.cc:29</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_ab1659ef71098c37e9fb4e55ab1664e84"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84">shaka::media::ByteQueue::Reset</a></div><div class="ttdeci">void Reset()</div><div class="ttdoc">Reset the queue to the empty state. </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00024">byte_queue.cc:24</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_a838fe5642e533477a5e229981e5f06e7"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">shaka::media::ByteQueue::Peek</a></div><div class="ttdeci">void Peek(const uint8_t **data, int *size) const </div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00063">byte_queue.cc:63</a></div></div>
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