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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2015 Google Inc. All rights reserved.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// license that can be found in the LICENSE file or at</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// https://developers.google.com/open-source/licenses/bsd</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/formats/webm/encryptor.h&quot;</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;gflags/gflags.h&gt;</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/aes_encryptor.h&quot;</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/buffer_writer.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/fourccs.h&quot;</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/media_sample.h&quot;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor">#include &quot;packager/media/codecs/vp9_parser.h&quot;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/webm/webm_constants.h&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="keyword">namespace </span>shaka {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">namespace </span>media {</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="keyword">namespace </span>webm {</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </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">const</span> <span class="keywordtype">size_t</span> kAesBlockSize = 16;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;Status CreateContentEncryption(mkvmuxer::Track* track, EncryptionKey* key) {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; <span class="keywordflow">if</span> (!track-&gt;AddContentEncoding()) {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR,</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160; <span class="stringliteral">&quot;Could not add ContentEncoding to track.&quot;</span>);</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160; }</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; mkvmuxer::ContentEncoding* <span class="keyword">const</span> encoding =</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; track-&gt;GetContentEncodingByIndex(0);</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keywordflow">if</span> (!encoding) {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR,</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="stringliteral">&quot;Could not add ContentEncoding to track.&quot;</span>);</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; mkvmuxer::ContentEncAESSettings* <span class="keyword">const</span> aes = encoding-&gt;enc_aes_settings();</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordflow">if</span> (!aes) {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR,</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="stringliteral">&quot;Error getting ContentEncAESSettings.&quot;</span>);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; }</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordflow">if</span> (aes-&gt;cipher_mode() != mkvmuxer::ContentEncAESSettings::kCTR) {</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR, <span class="stringliteral">&quot;Cipher Mode is not CTR.&quot;</span>);</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;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordflow">if</span> (!key-&gt;key_id.empty() &amp;&amp;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; !encoding-&gt;SetEncryptionID(</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; reinterpret_cast&lt;const uint8_t*&gt;(key-&gt;key_id.data()),</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; key-&gt;key_id.size())) {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordflow">return</span> Status(error::INTERNAL_ERROR, <span class="stringliteral">&quot;Error setting encryption ID.&quot;</span>);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; }</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="keywordflow">return</span> Status::OK;</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;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;} <span class="comment">// namespace</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;Encryptor::Encryptor() {}</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;Encryptor::~Encryptor() {}</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"><a class="line" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#afa6065049fad093b96643b9e3d70595f"> 61</a></span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#afa6065049fad093b96643b9e3d70595f">Encryptor::Initialize</a>(<a class="code" href="../../dd/d7a/classshaka_1_1media_1_1MuxerListener.html">MuxerListener</a>* muxer_listener,</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; KeySource::TrackType track_type,</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; Codec codec,</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <a class="code" href="../../d1/d1f/classshaka_1_1media_1_1KeySource.html">KeySource</a>* key_source,</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; <span class="keywordtype">bool</span> webm_subsample_encryption) {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; DCHECK(key_source);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">return</span> CreateEncryptor(muxer_listener, track_type, codec, key_source,</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; webm_subsample_encryption);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;}</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"><a class="line" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a866bb619cd0fde0c28ee522cbd4a8c59"> 71</a></span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a866bb619cd0fde0c28ee522cbd4a8c59">Encryptor::AddTrackInfo</a>(mkvmuxer::Track* track) {</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; DCHECK(key_);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">return</span> CreateContentEncryption(track, key_.get());</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;}</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a51a014fbe5ff6cfe4fad9e8f92c85561"> 76</a></span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a51a014fbe5ff6cfe4fad9e8f92c85561">Encryptor::EncryptFrame</a>(std::shared_ptr&lt;MediaSample&gt; sample,</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; <span class="keywordtype">bool</span> encrypt_frame) {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; DCHECK(encryptor_);</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; <span class="keyword">const</span> <span class="keywordtype">size_t</span> sample_size = sample-&gt;data_size();</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="comment">// We need to parse the frame (which also updates the vpx parser) even if the</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; <span class="comment">// frame is not encrypted as the next (encrypted) frame may be dependent on</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="comment">// this clear frame.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; std::vector&lt;VPxFrameInfo&gt; vpx_frames;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keywordflow">if</span> (vpx_parser_) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">if</span> (!vpx_parser_-&gt;Parse(sample-&gt;data(), sample_size, &amp;vpx_frames)) {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::MUXER_FAILURE, <span class="stringliteral">&quot;Failed to parse VPx frame.&quot;</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;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">if</span> (encrypt_frame) {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keyword">const</span> <span class="keywordtype">size_t</span> iv_size = encryptor_-&gt;iv().size();</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">if</span> (iv_size != kWebMIvSize) {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::MUXER_FAILURE,</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="stringliteral">&quot;Incorrect size WebM encryption IV.&quot;</span>);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">if</span> (vpx_frames.size()) {</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="comment">// Use partitioned subsample encryption: | signal_byte(3) | iv</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; <span class="comment">// | num_partitions | partition_offset * n | enc_data |</span></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; <span class="keywordflow">if</span> (vpx_frames.size() &gt; kWebMMaxSubsamples) {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::MUXER_FAILURE,</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="stringliteral">&quot;Maximum number of VPx encryption partitions exceeded.&quot;</span>);</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">size_t</span> num_partitions =</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; vpx_frames.size() == 1 ? 1 : vpx_frames.size() * 2;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordtype">size_t</span> header_size = kWebMSignalByteSize + iv_size +</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; kWebMNumPartitionsSize +</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160; (kWebMPartitionOffsetSize * num_partitions);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; sample-&gt;resize_data(header_size + sample_size);</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; uint8_t* sample_data = sample-&gt;writable_data();</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; memmove(sample_data + header_size, sample_data, sample_size);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; sample_data[0] = kWebMEncryptedSignal | kWebMPartitionedSignal;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; memcpy(sample_data + kWebMSignalByteSize, encryptor_-&gt;iv().data(),</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; iv_size);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; sample_data[kWebMSignalByteSize + kWebMIvSize] =</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; <span class="keyword">static_cast&lt;</span>uint8_t<span class="keyword">&gt;</span>(num_partitions);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; uint32_t partition_offset = 0;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">BufferWriter</a> offsets_buffer(kWebMPartitionOffsetSize * num_partitions);</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span>&amp; vpx_frame : vpx_frames) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; uint32_t encrypted_size = <span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; vpx_frame.frame_size - vpx_frame.uncompressed_header_size);</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; encrypted_size -= encrypted_size % kAesBlockSize;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; uint32_t clear_size =</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; <span class="keyword">static_cast&lt;</span>uint32_t<span class="keyword">&gt;</span>(vpx_frame.frame_size - encrypted_size);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; partition_offset += clear_size;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; offsets_buffer.<a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html#abd8854feedd8b45146eb04dacf7d5b2f">AppendInt</a>(partition_offset);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="keywordflow">if</span> (encrypted_size &gt; 0) {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; uint8_t* encrypted_ptr = sample_data + header_size + partition_offset;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; <span class="keywordflow">if</span> (!encryptor_-&gt;Crypt(encrypted_ptr, encrypted_size, encrypted_ptr)) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::MUXER_FAILURE, <span class="stringliteral">&quot;Failed to encrypt the frame.&quot;</span>);</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; }</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; partition_offset += encrypted_size;</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; <span class="keywordflow">if</span> (num_partitions &gt; 1) {</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; offsets_buffer.<a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html#abd8854feedd8b45146eb04dacf7d5b2f">AppendInt</a>(partition_offset);</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; }</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; }</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; DCHECK_EQ(num_partitions * kWebMPartitionOffsetSize,</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; offsets_buffer.Size());</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; memcpy(sample_data + kWebMSignalByteSize + kWebMIvSize +</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; kWebMNumPartitionsSize,</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; offsets_buffer.<a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html#ab3054a98a4ec27764c65511dc17a916d">Buffer</a>(), offsets_buffer.Size());</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; <span class="comment">// Use whole-frame encryption: | signal_byte(1) | iv | enc_data |</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; sample-&gt;resize_data(sample_size + iv_size + kWebMSignalByteSize);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; uint8_t* sample_data = sample-&gt;writable_data();</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="comment">// Encrypt the data in-place.</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; <span class="keywordflow">if</span> (!encryptor_-&gt;Crypt(sample_data, sample_size, sample_data)) {</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::MUXER_FAILURE, <span class="stringliteral">&quot;Failed to encrypt the frame.&quot;</span>);</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; <span class="comment">// First move the sample data to after the IV; then write the IV and</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; <span class="comment">// signal byte.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; memmove(sample_data + iv_size + kWebMSignalByteSize, sample_data,</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; sample_size);</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; sample_data[0] = kWebMEncryptedSignal;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; memcpy(sample_data + 1, encryptor_-&gt;iv().data(), iv_size);</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; encryptor_-&gt;UpdateIv();</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="comment">// Clear sample: | signal_byte(0) | data |</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; sample-&gt;resize_data(sample_size + 1);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; uint8_t* sample_data = sample-&gt;writable_data();</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; memmove(sample_data + 1, sample_data, sample_size);</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; sample_data[0] = 0x00;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; }</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; <span class="keywordflow">return</span> Status::OK;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160;}</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160;<a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> Encryptor::CreateEncryptor(<a class="code" href="../../dd/d7a/classshaka_1_1media_1_1MuxerListener.html">MuxerListener</a>* muxer_listener,</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; KeySource::TrackType track_type,</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; Codec codec,</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; <a class="code" href="../../d1/d1f/classshaka_1_1media_1_1KeySource.html">KeySource</a>* key_source,</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keywordtype">bool</span> webm_subsample_encryption) {</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; std::unique_ptr&lt;EncryptionKey&gt; encryption_key(<span class="keyword">new</span> <a class="code" href="../../dd/dbd/structshaka_1_1media_1_1EncryptionKey.html">EncryptionKey</a>());</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> status = key_source-&gt;<a class="code" href="../../d1/d1f/classshaka_1_1media_1_1KeySource.html#a994eb66cf09d8b08fd1c964f6afd3ab3">GetKey</a>(track_type, encryption_key.get());</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <span class="keywordflow">if</span> (!status.ok())</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <span class="keywordflow">return</span> status;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; <span class="keywordflow">if</span> (encryption_key-&gt;iv.empty()) {</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; <span class="keywordflow">if</span> (!<a class="code" href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd">AesCryptor::GenerateRandomIv</a>(FOURCC_cenc, &amp;encryption_key-&gt;iv))</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::INTERNAL_ERROR, <span class="stringliteral">&quot;Failed to generate random iv.&quot;</span>);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; }</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; DCHECK_EQ(kWebMIvSize, encryption_key-&gt;iv.size());</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; std::unique_ptr&lt;AesCtrEncryptor&gt; encryptor(<span class="keyword">new</span> <a class="code" href="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html">AesCtrEncryptor</a>());</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <span class="keyword">const</span> <span class="keywordtype">bool</span> initialized =</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; encryptor-&gt;InitializeWithIv(encryption_key-&gt;key, encryption_key-&gt;iv);</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; <span class="keywordflow">if</span> (!initialized)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; <span class="keywordflow">return</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a>(error::INTERNAL_ERROR, <span class="stringliteral">&quot;Failed to create the encryptor.&quot;</span>);</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="keywordflow">if</span> (webm_subsample_encryption &amp;&amp; codec == kCodecVP9) {</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; <span class="comment">// Allocate VP9 parser to do subsample encryption of VP9.</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160; vpx_parser_.reset(<span class="keyword">new</span> <a class="code" href="../../db/d5a/classshaka_1_1media_1_1VP9Parser.html">VP9Parser</a>);</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; }</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160;</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; <span class="keywordflow">if</span> (muxer_listener) {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; <span class="keyword">const</span> <span class="keywordtype">bool</span> kInitialEncryptionInfo = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; muxer_listener-&gt;<a class="code" href="../../dd/d7a/classshaka_1_1media_1_1MuxerListener.html#ab521acca727bbe01aa15c751325c0001">OnEncryptionInfoReady</a>(</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; kInitialEncryptionInfo, FOURCC_cenc, encryption_key-&gt;key_id,</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; encryptor-&gt;iv(), encryption_key-&gt;key_system_info);</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160; }</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160;</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; key_ = std::move(encryption_key);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; encryptor_ = std::move(encryptor);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; <span class="keywordflow">return</span> Status::OK;</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;</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160;} <span class="comment">// namespace webm</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160;} <span class="comment">// namespace media</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160;} <span class="comment">// namespace shaka</span></div>
<div class="ttc" id="classshaka_1_1media_1_1MuxerListener_html_ab521acca727bbe01aa15c751325c0001"><div class="ttname"><a href="../../dd/d7a/classshaka_1_1media_1_1MuxerListener.html#ab521acca727bbe01aa15c751325c0001">shaka::media::MuxerListener::OnEncryptionInfoReady</a></div><div class="ttdeci">virtual void OnEncryptionInfoReady(bool is_initial_encryption_info, FourCC protection_scheme, const std::vector&lt; uint8_t &gt; &amp;key_id, const std::vector&lt; uint8_t &gt; &amp;iv, const std::vector&lt; ProtectionSystemSpecificInfo &gt; &amp;key_system_info)=0</div></div>
<div class="ttc" id="classshaka_1_1media_1_1webm_1_1Encryptor_html_a866bb619cd0fde0c28ee522cbd4a8c59"><div class="ttname"><a href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a866bb619cd0fde0c28ee522cbd4a8c59">shaka::media::webm::Encryptor::AddTrackInfo</a></div><div class="ttdeci">Status AddTrackInfo(mkvmuxer::Track *track)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d98/encryptor_8cc_source.html#l00071">encryptor.cc:71</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1BufferWriter_html_abd8854feedd8b45146eb04dacf7d5b2f"><div class="ttname"><a href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html#abd8854feedd8b45146eb04dacf7d5b2f">shaka::media::BufferWriter::AppendInt</a></div><div class="ttdeci">void AppendInt(uint8_t v)</div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dd3/buffer__writer_8cc_source.html#l00025">buffer_writer.cc:25</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1KeySource_html_a994eb66cf09d8b08fd1c964f6afd3ab3"><div class="ttname"><a href="../../d1/d1f/classshaka_1_1media_1_1KeySource.html#a994eb66cf09d8b08fd1c964f6afd3ab3">shaka::media::KeySource::GetKey</a></div><div class="ttdeci">virtual Status GetKey(TrackType track_type, EncryptionKey *key)=0</div></div>
<div class="ttc" id="classshaka_1_1media_1_1BufferWriter_html"><div class="ttname"><a href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">shaka::media::BufferWriter</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dd2/buffer__writer_8h_source.html#l00022">buffer_writer.h:22</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1BufferWriter_html_ab3054a98a4ec27764c65511dc17a916d"><div class="ttname"><a href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html#ab3054a98a4ec27764c65511dc17a916d">shaka::media::BufferWriter::Buffer</a></div><div class="ttdeci">const uint8_t * Buffer() const </div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dd2/buffer__writer_8h_source.html#l00059">buffer_writer.h:59</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1webm_1_1Encryptor_html_a51a014fbe5ff6cfe4fad9e8f92c85561"><div class="ttname"><a href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#a51a014fbe5ff6cfe4fad9e8f92c85561">shaka::media::webm::Encryptor::EncryptFrame</a></div><div class="ttdeci">Status EncryptFrame(std::shared_ptr&lt; MediaSample &gt; sample, bool encrypt_frame)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d98/encryptor_8cc_source.html#l00076">encryptor.cc:76</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1webm_1_1Encryptor_html_afa6065049fad093b96643b9e3d70595f"><div class="ttname"><a href="../../de/dfa/classshaka_1_1media_1_1webm_1_1Encryptor.html#afa6065049fad093b96643b9e3d70595f">shaka::media::webm::Encryptor::Initialize</a></div><div class="ttdeci">Status Initialize(MuxerListener *muxer_listener, KeySource::TrackType track_type, Codec codec, KeySource *key_source, bool webm_subsample_encryption)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d98/encryptor_8cc_source.html#l00061">encryptor.cc:61</a></div></div>
<div class="ttc" id="structshaka_1_1media_1_1EncryptionKey_html"><div class="ttname"><a href="../../dd/dbd/structshaka_1_1media_1_1EncryptionKey.html">shaka::media::EncryptionKey</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d3f/key__source_8h_source.html#l00019">key_source.h:19</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesCryptor_html_a40d9a82d274d6fbaee5346328f11dedd"><div class="ttname"><a href="../../df/d87/classshaka_1_1media_1_1AesCryptor.html#a40d9a82d274d6fbaee5346328f11dedd">shaka::media::AesCryptor::GenerateRandomIv</a></div><div class="ttdeci">static bool GenerateRandomIv(FourCC protection_scheme, std::vector&lt; uint8_t &gt; *iv)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d55/aes__cryptor_8cc_source.html#l00107">aes_cryptor.cc:107</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1VP9Parser_html"><div class="ttname"><a href="../../db/d5a/classshaka_1_1media_1_1VP9Parser.html">shaka::media::VP9Parser</a></div><div class="ttdoc">Class to parse a vp9 bit stream. </div><div class="ttdef"><b>Definition:</b> <a href="../../df/d8a/vp9__parser_8h_source.html#l00020">vp9_parser.h:20</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1AesCtrEncryptor_html"><div class="ttname"><a href="../../d0/dd8/classshaka_1_1media_1_1AesCtrEncryptor.html">shaka::media::AesCtrEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00042">aes_encryptor.h:42</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1Status_html"><div class="ttname"><a href="../../d0/d93/classshaka_1_1media_1_1Status.html">shaka::media::Status</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d13/status_8h_source.html#l00079">status.h:79</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1KeySource_html"><div class="ttname"><a href="../../d1/d1f/classshaka_1_1media_1_1KeySource.html">shaka::media::KeySource</a></div><div class="ttdoc">KeySource is responsible for encryption key acquisition. </div><div class="ttdef"><b>Definition:</b> <a href="../../dc/d3f/key__source_8h_source.html#l00030">key_source.h:30</a></div></div>
<div class="ttc" id="classshaka_1_1media_1_1MuxerListener_html"><div class="ttname"><a href="../../dd/d7a/classshaka_1_1media_1_1MuxerListener.html">shaka::media::MuxerListener</a></div><div class="ttdef"><b>Definition:</b> <a href="../../de/dfa/muxer__listener_8h_source.html#l00030">muxer_listener.h:30</a></div></div>
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