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<div class="title">es_descriptor.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 (c) 2012 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/codecs/es_descriptor.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 &quot;packager/media/base/bit_reader.h&quot;</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/buffer_writer.h&quot;</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/rcheck.h&quot;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment">// ISO/IEC 14496-1:2004 Section 7.2.6.6 Table 6: StreamType values.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="keyword">enum</span> StreamType {</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160; kForbiddenStreamType = 0x00,</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160; kObjectDescriptorStreamType = 0x01,</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160; kClockReferenceStreamType = 0x02,</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160; kSceneDescriptionStreamType = 0x03,</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; kVisualStreamType = 0x04,</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; kAudioStreamType = 0x05,</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; kMPEG7StreamType = 0x06,</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; kIPMPStreamType = 0x07,</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; kObjectContentInfoStreamType = 0x08,</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; kMPEGJStreamType = 0x09,</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; kInteractionStream = 0x0A,</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; kIPMPToolStreamType = 0x0B,</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">// ISO/IEC 14496-1:2004 Section 7.3.2.3 Table 12: ISO SL Config Descriptor.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="keyword">enum</span> SLPredefinedTags {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; kSLPredefinedNull = 0x01,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; kSLPredefinedMP4 = 0x02,</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;};</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="comment">// The elementary stream size is specific by up to 4 bytes.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;<span class="comment">// The MSB of a byte indicates if there are more bytes for the size.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="keywordtype">bool</span> ReadESSize(BitReader* reader, uint32_t* size) {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; uint8_t msb;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; uint8_t byte;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; *size = 0;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; 4; ++i) {</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; RCHECK(reader-&gt;ReadBits(1, &amp;msb));</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; RCHECK(reader-&gt;ReadBits(7, &amp;byte));</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; *size = (*size &lt;&lt; 7) + byte;</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordflow">if</span> (msb == 0)</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; }</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;}</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;<span class="comment">// Descryptor Header Size: 1 byte tag and 1 byte size (we don&#39;t support</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="comment">// multi-bytes size for now).</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="keyword">const</span> <span class="keywordtype">size_t</span> kHeaderSize = 2;</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="keyword">const</span> <span class="keywordtype">size_t</span> kMaxDecoderSpecificInfoSize = 64;</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;<span class="keyword">const</span> uint32_t kUnknownBitrate = 0;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;} <span class="comment">// namespace</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;ESDescriptor::ESDescriptor()</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; : esid_(0),</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; object_type_(kForbidden),</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; max_bitrate_(kUnknownBitrate),</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; avg_bitrate_(kUnknownBitrate) {}</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;ESDescriptor::~ESDescriptor() {}</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="keywordtype">bool</span> ESDescriptor::Parse(<span class="keyword">const</span> std::vector&lt;uint8_t&gt;&amp; data) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; BitReader reader(&amp;data[0], data.size());</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; uint8_t tag;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; uint32_t size;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; uint8_t stream_dependency_flag;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; uint8_t url_flag;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; uint8_t ocr_stream_flag;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; uint16_t dummy;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; RCHECK(reader.ReadBits(8, &amp;tag));</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; RCHECK(tag == kESDescrTag);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; RCHECK(ReadESSize(&amp;reader, &amp;size));</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; RCHECK(reader.ReadBits(16, &amp;esid_)); <span class="comment">// ES_ID</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; RCHECK(reader.ReadBits(1, &amp;stream_dependency_flag));</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; RCHECK(reader.ReadBits(1, &amp;url_flag));</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; RCHECK(!url_flag); <span class="comment">// We don&#39;t support url flag</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; RCHECK(reader.ReadBits(1, &amp;ocr_stream_flag));</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; RCHECK(reader.ReadBits(5, &amp;dummy)); <span class="comment">// streamPriority</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">if</span> (stream_dependency_flag)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; RCHECK(reader.ReadBits(16, &amp;dummy)); <span class="comment">// dependsOn_ES_ID</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordflow">if</span> (ocr_stream_flag)</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; RCHECK(reader.ReadBits(16, &amp;dummy)); <span class="comment">// OCR_ES_Id</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; RCHECK(ParseDecoderConfigDescriptor(&amp;reader));</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</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;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;<span class="keywordtype">bool</span> ESDescriptor::ParseDecoderConfigDescriptor(BitReader* reader) {</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; uint8_t tag;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; uint32_t size;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; uint32_t dummy;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; RCHECK(reader-&gt;ReadBits(8, &amp;tag));</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; RCHECK(tag == kDecoderConfigDescrTag);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; RCHECK(ReadESSize(reader, &amp;size));</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; RCHECK(reader-&gt;ReadBits(8, &amp;object_type_));</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; RCHECK(reader-&gt;ReadBits(32, &amp;dummy));</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; RCHECK(reader-&gt;ReadBits(32, &amp;max_bitrate_));</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; RCHECK(reader-&gt;ReadBits(32, &amp;avg_bitrate_));</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; RCHECK(ParseDecoderSpecificInfo(reader));</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; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160;}</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160;<span class="keywordtype">bool</span> ESDescriptor::ParseDecoderSpecificInfo(BitReader* reader) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; DCHECK(reader);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; uint8_t tag;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; uint32_t size;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; RCHECK(reader-&gt;ReadBits(8, &amp;tag));</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; RCHECK(tag == kDecoderSpecificInfoTag);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; RCHECK(ReadESSize(reader, &amp;size));</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; decoder_specific_info_.resize(size);</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keywordflow">for</span> (uint32_t i = 0; i &lt; size; ++i)</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; RCHECK(reader-&gt;ReadBits(8, &amp;decoder_specific_info_[i]));</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160;}</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="keywordtype">void</span> ESDescriptor::Write(BufferWriter* writer)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; DCHECK(writer);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; CHECK_LT(decoder_specific_info_.size(), kMaxDecoderSpecificInfoSize);</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="keyword">const</span> std::vector&lt;uint8_t&gt; kEmptyDecodingBufferSize(3, 0);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="keyword">const</span> uint8_t kNoEsFlags = 0;</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="keyword">const</span> uint8_t decoder_specific_info_size =</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="keyword">static_cast&lt;</span>uint8_t<span class="keyword">&gt;</span>(decoder_specific_info_.size());</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <span class="comment">// 6 bit stream type. The last bit is reserved with 1.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; <span class="keyword">const</span> uint8_t stream_type = (kAudioStreamType &lt;&lt; 2) | 1;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="keyword">const</span> uint8_t decoder_config_size =</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; <span class="keyword">static_cast&lt;</span>uint8_t<span class="keyword">&gt;</span>(decoder_specific_info_size + kHeaderSize +</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="keyword">sizeof</span>(uint8_t) + <span class="comment">// object_type_.</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; <span class="keyword">sizeof</span>(stream_type) +</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; kEmptyDecodingBufferSize.size() +</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <span class="keyword">sizeof</span>(kUnknownBitrate) * 2);</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; <span class="keyword">const</span> uint8_t sl_config_size = <span class="keyword">sizeof</span>(uint8_t); <span class="comment">// predefined.</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; <span class="keyword">const</span> uint8_t es_size = decoder_config_size + kHeaderSize + sl_config_size +</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; kHeaderSize + <span class="keyword">sizeof</span>(esid_) + <span class="keyword">sizeof</span>(kNoEsFlags);</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; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(kESDescrTag));</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; writer-&gt;AppendInt(es_size);</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; writer-&gt;AppendInt(esid_);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; writer-&gt;AppendInt(kNoEsFlags);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(kDecoderConfigDescrTag));</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; writer-&gt;AppendInt(decoder_config_size);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(object_type_));</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; writer-&gt;AppendInt(stream_type);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; writer-&gt;AppendVector(kEmptyDecodingBufferSize);</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; writer-&gt;AppendInt(max_bitrate_);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; writer-&gt;AppendInt(avg_bitrate_);</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; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(kDecoderSpecificInfoTag));</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; writer-&gt;AppendInt(decoder_specific_info_size);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; writer-&gt;AppendVector(decoder_specific_info_);</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; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(kSLConfigTag));</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; writer-&gt;AppendInt(sl_config_size);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; writer-&gt;AppendInt(static_cast&lt;uint8_t&gt;(kSLPredefinedMP4));</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;}</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;<span class="keywordtype">size_t</span> ESDescriptor::ComputeSize()<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <span class="comment">// A bit magical. Refer to ESDescriptor::Write for details.</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; <span class="keyword">const</span> uint8_t decoder_specific_info_size =</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; <span class="keyword">static_cast&lt;</span>uint8_t<span class="keyword">&gt;</span>(decoder_specific_info_.size());</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; <span class="keyword">const</span> uint8_t decoder_config_size = decoder_specific_info_size + kHeaderSize +</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; <span class="keyword">sizeof</span>(uint8_t) * 5 +</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; <span class="keyword">sizeof</span>(uint32_t) * 2;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keyword">const</span> uint8_t sl_config_size = <span class="keyword">sizeof</span>(uint8_t);</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <span class="keyword">const</span> uint8_t es_size = decoder_config_size + kHeaderSize + sl_config_size +</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; kHeaderSize + <span class="keyword">sizeof</span>(esid_) + <span class="keyword">sizeof</span>(uint8_t);</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; <span class="keywordflow">return</span> es_size + kHeaderSize;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;}</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160;} <span class="comment">// namespace shaka</span></div>
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