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<div class="title">es_parser_adts.cc</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2014 The Chromium Authors. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// found in the LICENSE file.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp2t/es_parser_adts.h&quot;</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &lt;stdint.h&gt;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &lt;list&gt;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;packager/base/logging.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;packager/base/strings/string_number_conversions.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/audio_timestamp_helper.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/bit_reader.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/media_sample.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/timestamp.h&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp2t/adts_header.h&quot;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mp2t/mp2t_common.h&quot;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/mpeg/adts_constants.h&quot;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">// Return true if buf corresponds to an ADTS syncword.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment">// |buf| size must be at least 2.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="keyword">static</span> <span class="keywordtype">bool</span> isAdtsSyncWord(<span class="keyword">const</span> uint8_t* buf) {</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; <span class="keywordflow">return</span> (buf[0] == 0xff) &amp;&amp; ((buf[1] &amp; 0xf6) == 0xf0);</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;}</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="comment">// Look for an ADTS syncword.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment">// |new_pos| returns</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="comment">// - either the byte position of the ADTS frame (if found)</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="comment">// - or the byte position of 1st byte that was not processed (if not found).</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="comment">// In every case, the returned value in |new_pos| is such that new_pos &gt;= pos</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="comment">// |frame_sz| returns the size of the ADTS frame (if found).</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="comment">// Return whether a syncword was found.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="keyword">static</span> <span class="keywordtype">bool</span> LookForSyncWord(<span class="keyword">const</span> uint8_t* raw_es,</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordtype">int</span> raw_es_size,</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="keywordtype">int</span> pos,</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="keywordtype">int</span>* new_pos,</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordtype">int</span>* frame_sz) {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; DCHECK_GE(pos, 0);</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; DCHECK_LE(pos, raw_es_size);</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">int</span> max_offset = raw_es_size - kAdtsHeaderMinSize;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; <span class="keywordflow">if</span> (pos &gt;= max_offset) {</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="comment">// Do not change the position if:</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="comment">// - max_offset &lt; 0: not enough bytes to get a full header</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="comment">// Since pos &gt;= 0, this is a subcase of the next condition.</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="comment">// - pos &gt;= max_offset: might be the case after reading one full frame,</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="comment">// |pos| is then incremented by the frame size and might then point</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="comment">// to the end of the buffer.</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; *new_pos = pos;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; }</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> offset = pos; offset &lt; max_offset; offset++) {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; <span class="keyword">const</span> uint8_t* cur_buf = &amp;raw_es[offset];</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordflow">if</span> (!isAdtsSyncWord(cur_buf))</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="comment">// The first 12 bits must be 1.</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="comment">// The layer field (2 bits) must be set to 0.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="keywordtype">int</span> frame_size = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <a class="code" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a149fb9c7fa2718d719008af2dce8157f">mp2t::AdtsHeader::GetAdtsFrameSize</a>(cur_buf, kAdtsHeaderMinSize));</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="keywordflow">if</span> (frame_size &lt; kAdtsHeaderMinSize) {</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; <span class="comment">// Too short to be an ADTS frame.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; }</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="comment">// Check whether there is another frame</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="comment">// |size| apart from the current one.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordtype">int</span> remaining_size = raw_es_size - offset;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; <span class="keywordflow">if</span> (remaining_size &gt;= frame_size + 2 &amp;&amp;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; !isAdtsSyncWord(&amp;cur_buf[frame_size])) {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; }</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; *new_pos = offset;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; *frame_sz = frame_size;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; *new_pos = max_offset;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;}</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="keyword">namespace </span>mp2t {</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;EsParserAdts::EsParserAdts(uint32_t pid,</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keyword">const</span> NewStreamInfoCB&amp; new_stream_info_cb,</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keyword">const</span> EmitSampleCB&amp; emit_sample_cb,</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordtype">bool</span> sbr_in_mimetype)</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; : EsParser(pid),</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; new_stream_info_cb_(new_stream_info_cb),</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; emit_sample_cb_(emit_sample_cb),</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; sbr_in_mimetype_(sbr_in_mimetype) {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;}</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160;EsParserAdts::~EsParserAdts() {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;}</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="keywordtype">bool</span> EsParserAdts::Parse(<span class="keyword">const</span> uint8_t* buf,</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; <span class="keywordtype">int</span> size,</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; int64_t pts,</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; int64_t dts) {</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; <span class="keywordtype">int</span> raw_es_size;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keyword">const</span> uint8_t* raw_es;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="comment">// The incoming PTS applies to the access unit that comes just after</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <span class="comment">// the beginning of |buf|.</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="keywordflow">if</span> (pts != kNoTimestamp) {</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; es_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">Peek</a>(&amp;raw_es, &amp;raw_es_size);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; pts_list_.push_back(EsPts(raw_es_size, pts));</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; }</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="comment">// Copy the input data to the ES buffer.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; es_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#acea792e406efe5119cec2e3e522e02c2">Push</a>(buf, static_cast&lt;int&gt;(size));</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; es_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a838fe5642e533477a5e229981e5f06e7">Peek</a>(&amp;raw_es, &amp;raw_es_size);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="comment">// Look for every ADTS frame in the ES buffer starting at offset = 0</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="keywordtype">int</span> es_position = 0;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <span class="keywordtype">int</span> frame_size;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="keywordflow">while</span> (LookForSyncWord(raw_es, raw_es_size, es_position,</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; &amp;es_position, &amp;frame_size)) {</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="keyword">const</span> uint8_t* frame_ptr = raw_es + es_position;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; DVLOG(LOG_LEVEL_ES)</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; &lt;&lt; <span class="stringliteral">&quot;ADTS syncword @ pos=&quot;</span> &lt;&lt; es_position</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; &lt;&lt; <span class="stringliteral">&quot; frame_size=&quot;</span> &lt;&lt; frame_size;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; DVLOG(LOG_LEVEL_ES)</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; &lt;&lt; <span class="stringliteral">&quot;ADTS header: &quot;</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; &lt;&lt; base::HexEncode(frame_ptr, kAdtsHeaderMinSize);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; <span class="comment">// Do not process the frame if this one is a partial frame.</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; <span class="keywordtype">int</span> remaining_size = raw_es_size - es_position;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="keywordflow">if</span> (frame_size &gt; remaining_size)</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="keywordtype">size_t</span> header_size = <a class="code" href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a107e1269d5f826583c1940fb50c8cf92">AdtsHeader::GetAdtsHeaderSize</a>(frame_ptr, frame_size);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; <span class="comment">// Update the audio configuration if needed.</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; DCHECK_GE(frame_size, kAdtsHeaderMinSize);</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; <span class="keywordflow">if</span> (!UpdateAudioConfiguration(frame_ptr, frame_size))</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="comment">// Get the PTS &amp; the duration of this access unit.</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; <span class="keywordflow">while</span> (!pts_list_.empty() &amp;&amp;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; pts_list_.front().first &lt;= es_position) {</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; audio_timestamp_helper_-&gt;SetBaseTimestamp(pts_list_.front().second);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; pts_list_.pop_front();</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; int64_t current_pts = audio_timestamp_helper_-&gt;GetTimestamp();</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; int64_t frame_duration =</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; audio_timestamp_helper_-&gt;GetFrameDuration(kSamplesPerAACFrame);</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; <span class="comment">// Emit an audio frame.</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordtype">bool</span> is_key_frame = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160;</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; std::shared_ptr&lt;MediaSample&gt; sample = <a class="code" href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#ad8975dbb21747ff32c8604f5489bf5c9">MediaSample::CopyFrom</a>(</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; frame_ptr + header_size, frame_size - header_size, is_key_frame);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; sample-&gt;set_pts(current_pts);</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; sample-&gt;set_dts(current_pts);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; sample-&gt;set_duration(frame_duration);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; emit_sample_cb_.Run(pid(), sample);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; <span class="comment">// Update the PTS of the next frame.</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; audio_timestamp_helper_-&gt;AddFrames(kSamplesPerAACFrame);</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; <span class="comment">// Skip the current frame.</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; es_position += frame_size;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; }</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; <span class="comment">// Discard all the bytes that have been processed.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; DiscardEs(es_position);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;}</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;<span class="keywordtype">void</span> EsParserAdts::Flush() {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;}</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;<span class="keywordtype">void</span> EsParserAdts::Reset() {</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; es_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#ab1659ef71098c37e9fb4e55ab1664e84">Reset</a>();</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; pts_list_.clear();</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; last_audio_decoder_config_ = std::shared_ptr&lt;AudioStreamInfo&gt;();</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;}</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;<span class="keywordtype">bool</span> EsParserAdts::UpdateAudioConfiguration(<span class="keyword">const</span> uint8_t* adts_frame,</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; <span class="keywordtype">size_t</span> adts_frame_size) {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160; <span class="keyword">const</span> uint8_t kAacSampleSizeBits(16);</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; AdtsHeader adts_header;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; <span class="keywordflow">if</span> (!adts_header.Parse(adts_frame, adts_frame_size)) {</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; LOG(ERROR) &lt;&lt; <span class="stringliteral">&quot;Error parsing ADTS frame header.&quot;</span>;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; }</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; std::vector&lt;uint8_t&gt; audio_specific_config;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; <span class="keywordflow">if</span> (!adts_header.GetAudioSpecificConfig(&amp;audio_specific_config))</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; <span class="keywordflow">if</span> (last_audio_decoder_config_) {</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; <span class="comment">// Verify that the audio decoder config has not changed.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; <span class="keywordflow">if</span> (last_audio_decoder_config_-&gt;codec_config() == audio_specific_config) {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; <span class="comment">// Audio configuration has not changed.</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; NOTIMPLEMENTED() &lt;&lt; <span class="stringliteral">&quot;Varying audio configurations are not supported.&quot;</span>;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; }</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; <span class="comment">// The following code is written according to ISO 14496 Part 3 Table 1.11 and</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; <span class="comment">// Table 1.22. (Table 1.11 refers to the capping to 48000, Table 1.22 refers</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; <span class="comment">// to SBR doubling the AAC sample rate.)</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; <span class="keywordtype">int</span> samples_per_second = adts_header.GetSamplingFrequency();</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; <span class="keywordtype">int</span> extended_samples_per_second = sbr_in_mimetype_</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; ? std::min(2 * samples_per_second, 48000)</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; : samples_per_second;</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160;</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; last_audio_decoder_config_ = std::make_shared&lt;AudioStreamInfo&gt;(</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; pid(), kMpeg2Timescale, kInfiniteDuration, kCodecAAC,</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; <a class="code" href="../../da/d4e/classshaka_1_1media_1_1AudioStreamInfo.html#aee79e7aa61b741bb96f451c6de1c9d42">AudioStreamInfo::GetCodecString</a>(kCodecAAC, adts_header.GetObjectType()),</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; audio_specific_config.data(), audio_specific_config.size(),</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; kAacSampleSizeBits, adts_header.GetNumChannels(),</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; extended_samples_per_second, 0 <span class="comment">/* seek preroll */</span>, 0 <span class="comment">/* codec delay */</span>,</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160; 0 <span class="comment">/* max bitrate */</span>, 0 <span class="comment">/* avg bitrate */</span>, std::string(), <span class="keyword">false</span>);</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160;</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; DVLOG(1) &lt;&lt; <span class="stringliteral">&quot;Sampling frequency: &quot;</span> &lt;&lt; samples_per_second;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; DVLOG(1) &lt;&lt; <span class="stringliteral">&quot;Extended sampling frequency: &quot;</span> &lt;&lt; extended_samples_per_second;</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; DVLOG(1) &lt;&lt; <span class="stringliteral">&quot;Channel config: &quot;</span> &lt;&lt; adts_header.GetNumChannels();</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; DVLOG(1) &lt;&lt; <span class="stringliteral">&quot;Object type: &quot;</span> &lt;&lt; adts_header.GetObjectType();</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160; <span class="comment">// Reset the timestamp helper to use a new sampling frequency.</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; <span class="keywordflow">if</span> (audio_timestamp_helper_) {</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; int64_t base_timestamp = audio_timestamp_helper_-&gt;GetTimestamp();</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; audio_timestamp_helper_.reset(</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160; <span class="keyword">new</span> AudioTimestampHelper(kMpeg2Timescale, samples_per_second));</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160; audio_timestamp_helper_-&gt;SetBaseTimestamp(base_timestamp);</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; audio_timestamp_helper_.reset(</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160; <span class="keyword">new</span> AudioTimestampHelper(kMpeg2Timescale, extended_samples_per_second));</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160; }</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160; <span class="comment">// Audio config notification.</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160; new_stream_info_cb_.Run(last_audio_decoder_config_);</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160;}</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>&#160;</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>&#160;<span class="keywordtype">void</span> EsParserAdts::DiscardEs(<span class="keywordtype">int</span> nbytes) {</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>&#160; DCHECK_GE(nbytes, 0);</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>&#160; <span class="keywordflow">if</span> (nbytes &lt;= 0)</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>&#160; <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>&#160;</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>&#160; <span class="comment">// Adjust the ES position of each PTS.</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>&#160; <span class="keywordflow">for</span> (EsPtsList::iterator it = pts_list_.begin(); it != pts_list_.end(); ++it)</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>&#160; it-&gt;first -= nbytes;</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>&#160;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>&#160; <span class="comment">// Discard |nbytes| of ES.</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>&#160; es_byte_queue_.<a class="code" href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a31b30d39d14fca3ce722b4233de95c79">Pop</a>(nbytes);</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>&#160;}</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>&#160;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>&#160;} <span class="comment">// namespace mp2t</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>&#160;} <span class="comment">// namespace shaka</span></div>
<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>
<div class="ttc" id="classshaka_1_1media_1_1ByteQueue_html_a31b30d39d14fca3ce722b4233de95c79"><div class="ttname"><a href="../../d7/dda/classshaka_1_1media_1_1ByteQueue.html#a31b30d39d14fca3ce722b4233de95c79">shaka::media::ByteQueue::Pop</a></div><div class="ttdeci">void Pop(int count)</div><div class="ttdef"><b>Definition:</b> <a href="../../d7/df9/byte__queue_8cc_source.html#l00070">byte_queue.cc:70</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1mp2t_1_1AdtsHeader_html_a149fb9c7fa2718d719008af2dce8157f"><div class="ttname"><a href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a149fb9c7fa2718d719008af2dce8157f">shaka::media::mp2t::AdtsHeader::GetAdtsFrameSize</a></div><div class="ttdeci">static size_t GetAdtsFrameSize(const uint8_t *data, size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d5b/adts__header_8cc_source.html#l00023">adts_header.cc:23</a></div></div>
<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>
<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>
<div class="ttc" id="classshaka_1_1media_1_1AudioStreamInfo_html_aee79e7aa61b741bb96f451c6de1c9d42"><div class="ttname"><a href="../../da/d4e/classshaka_1_1media_1_1AudioStreamInfo.html#aee79e7aa61b741bb96f451c6de1c9d42">shaka::media::AudioStreamInfo::GetCodecString</a></div><div class="ttdeci">static std::string GetCodecString(Codec codec, uint8_t audio_object_type)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d04/audio__stream__info_8cc_source.html#l00095">audio_stream_info.cc:95</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1MediaSample_html_ad8975dbb21747ff32c8604f5489bf5c9"><div class="ttname"><a href="../../d7/d6d/classshaka_1_1media_1_1MediaSample.html#ad8975dbb21747ff32c8604f5489bf5c9">shaka::media::MediaSample::CopyFrom</a></div><div class="ttdeci">static std::shared_ptr&lt; MediaSample &gt; 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>
<div class="ttc" id="classshaka_1_1media_1_1mp2t_1_1AdtsHeader_html_a107e1269d5f826583c1940fb50c8cf92"><div class="ttname"><a href="../../d3/d0c/classshaka_1_1media_1_1mp2t_1_1AdtsHeader.html#a107e1269d5f826583c1940fb50c8cf92">shaka::media::mp2t::AdtsHeader::GetAdtsHeaderSize</a></div><div class="ttdeci">static size_t GetAdtsHeaderSize(const uint8_t *data, size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/d5b/adts__header_8cc_source.html#l00031">adts_header.cc:31</a></div></div>
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