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<div class="title">es_parser_h26x.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/es_parser_h26x.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 <stdint.h></span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include "packager/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/base/numerics/safe_conversions.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/base/media_sample.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/base/offset_byte_queue.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/media/base/timestamp.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/media/base/video_stream_info.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/codecs/h26x_byte_to_unit_stream_converter.h"</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/formats/mp2t/mp2t_common.h"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">namespace </span>mp2t {</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </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="keyword">const</span> <span class="keywordtype">int</span> kStartCodeSize = 3;</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kH264NaluHeaderSize = 1;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kH265NaluHeaderSize = 2;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> } <span class="comment">// namespace</span></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> EsParserH26x::EsParserH26x(</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  Nalu::CodecType type,</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  std::unique_ptr<H26xByteToUnitStreamConverter> stream_converter,</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  uint32_t pid,</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> EmitSampleCB& emit_sample_cb)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  : EsParser(pid),</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  emit_sample_cb_(emit_sample_cb),</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  type_(type),</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  es_queue_(new media::OffsetByteQueue()),</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  stream_converter_(std::move(stream_converter)) {}</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> EsParserH26x::~EsParserH26x() {}</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> <span class="keywordtype">bool</span> EsParserH26x::Parse(<span class="keyword">const</span> uint8_t* buf,</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">int</span> size,</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  int64_t pts,</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  int64_t dts) {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// Note: Parse is invoked each time a PES packet has been reassembled.</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="comment">// Unfortunately, a PES packet does not necessarily map</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="comment">// to an h264/h265 access unit, although the HLS recommendation is to use one</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// PES for each access unit (but this is just a recommendation and some</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// streams do not comply with this recommendation).</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// HLS recommendation: "In AVC video, you should have both a DTS and a</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// PTS in each PES header".</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// However, some streams do not comply with this recommendation.</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  DVLOG_IF(1, pts == kNoTimestamp) << <span class="stringliteral">"Each video PES should have a PTS"</span>;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">if</span> (pts != kNoTimestamp) {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  TimingDesc timing_desc;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  timing_desc.pts = pts;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  timing_desc.dts = (dts != kNoTimestamp) ? dts : pts;</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>  <span class="comment">// Link the end of the byte queue with the incoming timing descriptor.</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  timing_desc_list_.push_back(</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  std::pair<int64_t, TimingDesc>(es_queue_->tail(), timing_desc));</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  }</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// Add the incoming bytes to the ES queue.</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  es_queue_->Push(buf, size);</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> ParseInternal();</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keywordtype">void</span> EsParserH26x::Flush() {</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  DVLOG(1) << <span class="stringliteral">"EsParserH26x::Flush"</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="comment">// Simulate two additional AUDs to force emitting the last access unit</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// which is assumed to be complete at this point.</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// Two AUDs are needed because the exact size of a NAL unit can only be</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">// determined after seeing the next NAL unit, so we need a second AUD to</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">// finish the parsing of the first AUD.</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (type_ == Nalu::kH264) {</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">const</span> uint8_t aud[] = {0x00, 0x00, 0x01, 0x09, 0x00, 0x00, 0x01, 0x09};</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  es_queue_->Push(aud, <span class="keyword">sizeof</span>(aud));</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  DCHECK_EQ(Nalu::kH265, type_);</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">const</span> uint8_t aud[] = {0x00, 0x00, 0x01, 0x46, 0x01,</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  0x00, 0x00, 0x01, 0x46, 0x01};</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  es_queue_->Push(aud, <span class="keyword">sizeof</span>(aud));</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  }</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  CHECK(ParseInternal());</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">if</span> (pending_sample_) {</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="comment">// Flush pending sample.</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  DCHECK(pending_sample_duration_);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  pending_sample_->set_duration(pending_sample_duration_);</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  emit_sample_cb_.Run(pid(), pending_sample_);</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  pending_sample_ = scoped_refptr<MediaSample>();</div>
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<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> </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="keywordtype">void</span> EsParserH26x::Reset() {</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  es_queue_.reset(<span class="keyword">new</span> media::OffsetByteQueue());</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  current_search_position_ = 0;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  current_access_unit_position_ = 0;</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  current_video_slice_info_.valid = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  next_access_unit_position_set_ = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  next_access_unit_position_ = 0;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  current_nalu_info_.reset();</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  timing_desc_list_.clear();</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  pending_sample_ = scoped_refptr<MediaSample>();</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  pending_sample_duration_ = 0;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  waiting_for_key_frame_ = <span class="keyword">true</span>;</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="keywordtype">bool</span> EsParserH26x::SearchForNalu(uint64_t* position, Nalu* nalu) {</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">const</span> uint8_t* es;</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordtype">int</span> es_size;</div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  es_queue_->PeekAt(current_search_position_, &es, &es_size);</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>  <span class="comment">// Find a start code.</span></div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  uint64_t start_code_offset;</div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  uint8_t start_code_size;</div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> start_code_found = NaluReader::FindStartCode(</div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  es, es_size, &start_code_offset, &start_code_size);</div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> (!start_code_found) {</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// We didn't find a start code, so we don't have to search this data again.</span></div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">if</span> (es_size > kStartCodeSize)</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  current_search_position_ += es_size - kStartCodeSize;</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// Ensure the next NAL unit is a real NAL unit.</span></div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">const</span> uint8_t* next_nalu_ptr = es + start_code_offset + start_code_size;</div>
|
|
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">// This size is likely inaccurate, this is just to get the header info.</span></div>
|
|
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">const</span> int64_t next_nalu_size = es_size - start_code_offset - start_code_size;</div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (next_nalu_size <</div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  (type_ == Nalu::kH264 ? kH264NaluHeaderSize : kH265NaluHeaderSize)) {</div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="comment">// There was not enough data, wait for more.</span></div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  }</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>  <span class="comment">// Update search position for next nalu.</span></div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  current_search_position_ += start_code_offset + start_code_size;</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div>
|
|
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">// |next_nalu_info_| is made global intentionally to avoid repetitive memory</span></div>
|
|
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">// allocation which could create memory fragments.</span></div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">if</span> (!next_nalu_info_)</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  next_nalu_info_.reset(<span class="keyword">new</span> NaluInfo);</div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">if</span> (!next_nalu_info_->nalu.Initialize(type_, next_nalu_ptr, next_nalu_size)) {</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// This NAL unit is invalid, skip it and search again.</span></div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> SearchForNalu(position, nalu);</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  next_nalu_info_->position = current_search_position_ - start_code_size;</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  next_nalu_info_->start_code_size = start_code_size;</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> </div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> current_nalu_set = current_nalu_info_ ? <span class="keyword">true</span> : <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="keywordflow">if</span> (current_nalu_info_) {</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// Starting position for the nalu including start code.</span></div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  *position = current_nalu_info_->position;</div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// Update the NALU because the data pointer may have been invalidated.</span></div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keyword">const</span> uint8_t* current_nalu_ptr =</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  next_nalu_ptr +</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  (current_nalu_info_->position + current_nalu_info_->start_code_size) -</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  current_search_position_;</div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keyword">const</span> uint64_t current_nalu_size = next_nalu_info_->position -</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  current_nalu_info_->position -</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  current_nalu_info_->start_code_size;</div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  CHECK(nalu->Initialize(type_, current_nalu_ptr, current_nalu_size));</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  current_nalu_info_.swap(next_nalu_info_);</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">return</span> current_nalu_set ? <span class="keyword">true</span> : SearchForNalu(position, nalu);</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> }</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="keywordtype">bool</span> EsParserH26x::ParseInternal() {</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  uint64_t position;</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  Nalu nalu;</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  VideoSliceInfo video_slice_info;</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">while</span> (SearchForNalu(&position, &nalu)) {</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">// ITU H.264 sec. 7.4.1.2.3</span></div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// H264: The first of the NAL units with |can_start_access_unit() == true|</span></div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="comment">// after the last VCL NAL unit of a primary coded picture specifies the</span></div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// start of a new access unit.</span></div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">// ITU H.265 sec. 7.4.2.4.4</span></div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// H265: The first of the NAL units with |can_start_access_unit() == true|</span></div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// after the last VCL NAL unit preceding firstBlPicNalUnit (the first</span></div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// VCL NAL unit of a coded picture with nuh_layer_id equal to 0), if</span></div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// any, specifies the start of a new access unit.</span></div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (nalu.can_start_access_unit()) {</div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">if</span> (!next_access_unit_position_set_) {</div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  next_access_unit_position_set_ = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  next_access_unit_position_ = position;</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  }</div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  RCHECK(ProcessNalu(nalu, &video_slice_info));</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <span class="keywordflow">if</span> (nalu.is_video_slice() && !video_slice_info.valid) {</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">// This could happen only if decoder config is not available yet. Drop</span></div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="comment">// this frame.</span></div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  DCHECK(!current_video_slice_info_.valid);</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  next_access_unit_position_set_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">continue</span>;</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (nalu.is_video_slice()) {</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// This isn't the first VCL NAL unit. Next access unit should start after</span></div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="comment">// this NAL unit.</span></div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  next_access_unit_position_set_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">continue</span>;</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  }</div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="comment">// AUD shall be the first NAL unit if present. There shall be at most one</span></div>
|
|
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">// AUD in any access unit. We can emit the current access unit which shall</span></div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// not contain the AUD.</span></div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">if</span> (nalu.is_aud())</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">return</span> EmitCurrentAccessUnit();</div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> </div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="comment">// We can only determine if the current access unit ends after seeing</span></div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="comment">// another VCL NAL unit.</span></div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordflow">if</span> (!video_slice_info.valid)</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">continue</span>;</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> </div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="comment">// Check if it is the first VCL NAL unit of a primary coded picture. It is</span></div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">// always true for H265 as nuh_layer_id shall be == 0 at this point.</span></div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordtype">bool</span> is_first_vcl_nalu = <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keywordflow">if</span> (type_ == Nalu::kH264) {</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">if</span> (current_video_slice_info_.valid) {</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="comment">// ITU H.264 sec. 7.4.1.2.4 Detection of the first VCL NAL unit of a</span></div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="comment">// primary coded picture. Only pps_id and frame_num are checked here.</span></div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  is_first_vcl_nalu =</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  video_slice_info.frame_num != current_video_slice_info_.frame_num ||</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  video_slice_info.pps_id != current_video_slice_info_.pps_id;</div>
|
|
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  }</div>
|
|
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  }</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">if</span> (!is_first_vcl_nalu) {</div>
|
|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">// This isn't the first VCL NAL unit. Next access unit should start after</span></div>
|
|
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">// this NAL unit.</span></div>
|
|
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  next_access_unit_position_set_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">continue</span>;</div>
|
|
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  }</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>  DCHECK(next_access_unit_position_set_);</div>
|
|
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  RCHECK(EmitCurrentAccessUnit());</div>
|
|
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div>
|
|
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <span class="comment">// Delete the data we have already processed.</span></div>
|
|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  es_queue_->Trim(next_access_unit_position_);</div>
|
|
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div>
|
|
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  current_access_unit_position_ = next_access_unit_position_;</div>
|
|
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  current_video_slice_info_ = video_slice_info;</div>
|
|
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  next_access_unit_position_set_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
|
|
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> }</div>
|
|
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
|
|
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="keywordtype">bool</span> EsParserH26x::EmitCurrentAccessUnit() {</div>
|
|
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">if</span> (current_video_slice_info_.valid) {</div>
|
|
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">if</span> (current_video_slice_info_.is_key_frame)</div>
|
|
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  waiting_for_key_frame_ = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">if</span> (!waiting_for_key_frame_) {</div>
|
|
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  RCHECK(</div>
|
|
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  EmitFrame(current_access_unit_position_,</div>
|
|
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  next_access_unit_position_ - current_access_unit_position_,</div>
|
|
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  current_video_slice_info_.is_key_frame,</div>
|
|
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  current_video_slice_info_.pps_id));</div>
|
|
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  }</div>
|
|
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  current_video_slice_info_.valid = <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  }</div>
|
|
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00266"></a><span class="lineno"> 266</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> <span class="keywordtype">bool</span> EsParserH26x::EmitFrame(int64_t access_unit_pos,</div>
|
|
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordtype">int</span> access_unit_size,</div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordtype">bool</span> is_key_frame,</div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordtype">int</span> pps_id) {</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="comment">// Get the access unit timing info.</span></div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  TimingDesc current_timing_desc = {kNoTimestamp, kNoTimestamp};</div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">while</span> (!timing_desc_list_.empty() &&</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  timing_desc_list_.front().first <= access_unit_pos) {</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  current_timing_desc = timing_desc_list_.front().second;</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  timing_desc_list_.pop_front();</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  }</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">if</span> (current_timing_desc.pts == kNoTimestamp)</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> </div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">// Emit a frame.</span></div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  DVLOG(LOG_LEVEL_ES) << <span class="stringliteral">"Emit frame: stream_pos="</span> << access_unit_pos</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  << <span class="stringliteral">" size="</span> << access_unit_size;</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordtype">int</span> es_size;</div>
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="keyword">const</span> uint8_t* es;</div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  es_queue_->PeekAt(access_unit_pos, &es, &es_size);</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">// Convert frame to unit stream format.</span></div>
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  std::vector<uint8_t> converted_frame;</div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  <span class="keywordflow">if</span> (!stream_converter_->ConvertByteStreamToNalUnitStream(</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  es, access_unit_size, &converted_frame)) {</div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  DLOG(ERROR) << <span class="stringliteral">"Failure to convert video frame to unit stream format."</span>;</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  }</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">// Update the video decoder configuration if needed.</span></div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  RCHECK(UpdateVideoDecoderConfig(pps_id));</div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="comment">// Create the media sample, emitting always the previous sample after</span></div>
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<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="comment">// calculating its duration.</span></div>
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  scoped_refptr<MediaSample> media_sample = <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#a3fac8e4cc8da3b34ef5f698411ec868b">MediaSample::CopyFrom</a>(</div>
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  converted_frame.data(), converted_frame.size(), is_key_frame);</div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  media_sample->set_dts(current_timing_desc.dts);</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  media_sample->set_pts(current_timing_desc.pts);</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keywordflow">if</span> (pending_sample_) {</div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  DCHECK_GT(media_sample->dts(), pending_sample_->dts());</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  pending_sample_duration_ = media_sample->dts() - pending_sample_->dts();</div>
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  pending_sample_->set_duration(pending_sample_duration_);</div>
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  emit_sample_cb_.Run(pid(), pending_sample_);</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>  pending_sample_ = media_sample;</div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> </div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> }</div>
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<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> </div>
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<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> } <span class="comment">// namespace mp2t</span></div>
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<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> } <span class="comment">// namespace shaka</span></div>
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<div class="ttc" id="classshaka_1_1media_1_1MediaSample_html_a3fac8e4cc8da3b34ef5f698411ec868b"><div class="ttname"><a href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#a3fac8e4cc8da3b34ef5f698411ec868b">shaka::media::MediaSample::CopyFrom</a></div><div class="ttdeci">static scoped_refptr< MediaSample > CopyFrom(const uint8_t *data, size_t size, bool is_key_frame)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d0d/media__sample_8cc_source.html#l00045">media_sample.cc:45</a></div></div>
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