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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_aa847bee70cdde822696c7e33a504139.html">crypto</a></li> </ul>
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<div class="title">encryption_handler.cc</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2017 Google Inc. All rights reserved.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <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> <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> <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> </div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/crypto/encryption_handler.h"</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <stddef.h></span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <stdint.h></span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> </div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include <algorithm></span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/media/base/aes_encryptor.h"</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/base/audio_stream_info.h"</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/base/key_source.h"</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "packager/media/base/macros.h"</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "packager/media/base/media_sample.h"</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "packager/media/base/video_stream_info.h"</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include "packager/media/crypto/aes_encryptor_factory.h"</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include "packager/media/crypto/subsample_generator.h"</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include "packager/status_macros.h"</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span>media {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="keyword">namespace </span>{</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// The encryption handler only supports a single output.</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> kStreamIndex = 0;</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> </div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// The default KID, KEY and IV for key rotation are all 0s.</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// They are placeholders and are not really being used to encrypt data.</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keyword">const</span> uint8_t kKeyRotationDefaultKeyId[] = {</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> };</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">const</span> uint8_t kKeyRotationDefaultKey[] = {</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> };</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="keyword">const</span> uint8_t kKeyRotationDefaultIv[] = {</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  0, 0, 0, 0, 0, 0, 0, 0,</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> };</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> std::string GetStreamLabelForEncryption(</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">const</span> StreamInfo& stream_info,</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keyword">const</span> std::function<std::string(</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keyword">const</span> EncryptionParams::EncryptedStreamAttributes& stream_attributes)>&</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  stream_label_func) {</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  EncryptionParams::EncryptedStreamAttributes stream_attributes;</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (stream_info.stream_type() == kStreamAudio) {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  stream_attributes.stream_type =</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  EncryptionParams::EncryptedStreamAttributes::kAudio;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (stream_info.stream_type() == kStreamVideo) {</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">const</span> VideoStreamInfo& video_stream_info =</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">static_cast<</span><span class="keyword">const </span>VideoStreamInfo&<span class="keyword">></span>(stream_info);</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  stream_attributes.stream_type =</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  EncryptionParams::EncryptedStreamAttributes::kVideo;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  stream_attributes.oneof.video.width = video_stream_info.width();</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  stream_attributes.oneof.video.height = video_stream_info.height();</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  }</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> stream_label_func(stream_attributes);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> }</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keywordtype">bool</span> IsPatternEncryptionScheme(FourCC protection_scheme) {</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> protection_scheme == kAppleSampleAesProtectionScheme ||</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  protection_scheme == FOURCC_cbcs || protection_scheme == FOURCC_cens;</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> }</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> EncryptionHandler::EncryptionHandler(<span class="keyword">const</span> EncryptionParams& encryption_params,</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  KeySource* key_source)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  : encryption_params_(encryption_params),</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  protection_scheme_(</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  static_cast<FourCC>(encryption_params.protection_scheme)),</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  key_source_(key_source),</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  subsample_generator_(</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  new SubsampleGenerator(encryption_params.vp9_subsample_encryption)),</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  encryptor_factory_(new AesEncryptorFactory) {}</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> EncryptionHandler::~EncryptionHandler() = <span class="keywordflow">default</span>;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div><div class="line"><a name="l00082"></a><span class="lineno"><a class="line" href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a3f1808a4386081e5e1c9a798a1a69dd0"> 82</a></span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> <a class="code" href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a3f1808a4386081e5e1c9a798a1a69dd0">EncryptionHandler::InitializeInternal</a>() {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (!encryption_params_.stream_label_func) {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a>(error::INVALID_ARGUMENT, <span class="stringliteral">"Stream label function not set."</span>);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span> (num_input_streams() != 1 || next_output_stream_index() != 1) {</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a>(error::INVALID_ARGUMENT,</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="stringliteral">"Expects exactly one input and output."</span>);</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  }</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> Status::OK;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"><a class="line" href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a7887e6060eb572036674ecb9a7e045c4"> 93</a></span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> <a class="code" href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a7887e6060eb572036674ecb9a7e045c4">EncryptionHandler::Process</a>(std::unique_ptr<StreamData> stream_data) {</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">switch</span> (stream_data->stream_data_type) {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">case</span> StreamDataType::kStreamInfo:</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">return</span> ProcessStreamInfo(*stream_data->stream_info);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">case</span> StreamDataType::kSegmentInfo: {</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  std::shared_ptr<SegmentInfo> segment_info(<span class="keyword">new</span> <a class="code" href="../../d0/dc0/structshaka_1_1media_1_1SegmentInfo.html">SegmentInfo</a>(</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  *stream_data->segment_info));</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  segment_info->is_encrypted = remaining_clear_lead_ <= 0;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> key_rotation_enabled = crypto_period_duration_ != 0;</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span> (key_rotation_enabled)</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  segment_info->key_rotation_encryption_config = encryption_config_;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (!segment_info->is_subsegment) {</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (key_rotation_enabled)</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  check_new_crypto_period_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (remaining_clear_lead_ > 0)</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  remaining_clear_lead_ -= segment_info->duration;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">return</span> DispatchSegmentInfo(kStreamIndex, segment_info);</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  }</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">case</span> StreamDataType::kMediaSample:</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">return</span> ProcessMediaSample(std::move(stream_data->media_sample));</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  VLOG(3) << <span class="stringliteral">"Stream data type "</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  << <span class="keyword">static_cast<</span><span class="keywordtype">int</span><span class="keyword">></span>(stream_data->stream_data_type) << <span class="stringliteral">" ignored."</span>;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">return</span> Dispatch(std::move(stream_data));</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  }</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> }</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span> </div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> EncryptionHandler::ProcessStreamInfo(<span class="keyword">const</span> <a class="code" href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html">StreamInfo</a>& clear_info) {</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (clear_info.is_encrypted()) {</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a>(error::INVALID_ARGUMENT,</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="stringliteral">"Input stream is already encrypted."</span>);</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  DCHECK_NE(kStreamUnknown, clear_info.stream_type());</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  DCHECK_NE(kStreamText, clear_info.stream_type());</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  std::shared_ptr<StreamInfo> stream_info = clear_info.<a class="code" href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html#afdd9b2df8ae1c11bb033c44eaba5e38d">Clone</a>();</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  RETURN_IF_ERROR(</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  subsample_generator_->Initialize(protection_scheme_, *stream_info));</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  remaining_clear_lead_ =</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  encryption_params_.clear_lead_in_seconds * stream_info->time_scale();</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  crypto_period_duration_ =</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  encryption_params_.crypto_period_duration_in_seconds *</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  stream_info->time_scale();</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  codec_ = stream_info->codec();</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  stream_label_ = GetStreamLabelForEncryption(</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  *stream_info, encryption_params_.stream_label_func);</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  SetupProtectionPattern(stream_info->stream_type());</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="../../dd/dbd/structshaka_1_1media_1_1EncryptionKey.html">EncryptionKey</a> encryption_key;</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> key_rotation_enabled = crypto_period_duration_ != 0;</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">if</span> (key_rotation_enabled) {</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  check_new_crypto_period_ = <span class="keyword">true</span>;</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// Setup dummy key id, key and iv to signal encryption for key rotation.</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  encryption_key.key_id.assign(std::begin(kKeyRotationDefaultKeyId),</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  std::end(kKeyRotationDefaultKeyId));</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  encryption_key.key.assign(std::begin(kKeyRotationDefaultKey),</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  std::end(kKeyRotationDefaultKey));</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  encryption_key.iv.assign(std::begin(kKeyRotationDefaultIv),</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  std::end(kKeyRotationDefaultIv));</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  RETURN_IF_ERROR(key_source_->GetKey(stream_label_, &encryption_key));</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">if</span> (!CreateEncryptor(encryption_key))</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a>(error::ENCRYPTION_FAILURE, <span class="stringliteral">"Failed to create encryptor"</span>);</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  stream_info->set_is_encrypted(<span class="keyword">true</span>);</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  stream_info->set_has_clear_lead(encryption_params_.clear_lead_in_seconds > 0);</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  stream_info->set_encryption_config(*encryption_config_);</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">return</span> DispatchStreamInfo(kStreamIndex, stream_info);</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span> }</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span> </div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a> EncryptionHandler::ProcessMediaSample(</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  std::shared_ptr<const MediaSample> clear_sample) {</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  DCHECK(clear_sample);</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span> </div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// Process the frame even if the frame is not encrypted as the next</span></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="comment">// (encrypted) frame may be dependent on this clear frame.</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  std::vector<SubsampleEntry> subsamples;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  RETURN_IF_ERROR(subsample_generator_->GenerateSubsamples(</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  clear_sample->data(), clear_sample->data_size(), &subsamples));</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span> </div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// Need to setup the encryptor for new segments even if this segment does not</span></div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="comment">// need to be encrypted, so we can signal encryption metadata earlier to</span></div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// allows clients to prefetch the keys.</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">if</span> (check_new_crypto_period_) {</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// |dts| can be negative, e.g. after EditList adjustments. Normalized to 0</span></div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// in that case.</span></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keyword">const</span> int64_t dts = std::max(clear_sample->dts(), <span class="keyword">static_cast<</span>int64_t<span class="keyword">></span>(0));</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keyword">const</span> int64_t current_crypto_period_index = dts / crypto_period_duration_;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span> (current_crypto_period_index != prev_crypto_period_index_) {</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <a class="code" href="../../dd/dbd/structshaka_1_1media_1_1EncryptionKey.html">EncryptionKey</a> encryption_key;</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  RETURN_IF_ERROR(key_source_->GetCryptoPeriodKey(</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  current_crypto_period_index, stream_label_, &encryption_key));</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keywordflow">if</span> (!CreateEncryptor(encryption_key))</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/d20/classshaka_1_1Status.html">Status</a>(error::ENCRYPTION_FAILURE, <span class="stringliteral">"Failed to create encryptor"</span>);</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  prev_crypto_period_index_ = current_crypto_period_index;</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  }</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  check_new_crypto_period_ = <span class="keyword">false</span>;</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  }</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span> </div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// Since there is no encryption needed right now, send the clear copy</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// downstream so we can save the costs of copying it.</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">if</span> (remaining_clear_lead_ > 0) {</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">return</span> DispatchMediaSample(kStreamIndex, std::move(clear_sample));</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  }</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  std::shared_ptr<uint8_t> cipher_sample_data(</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keyword">new</span> uint8_t[clear_sample->data_size()], std::default_delete<uint8_t[]>());</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span> </div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keyword">const</span> uint8_t* source = clear_sample->data();</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  uint8_t* dest = cipher_sample_data.get();</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">if</span> (!subsamples.empty()) {</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordtype">size_t</span> total_size = 0;</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> <a class="code" href="../../d1/d34/structshaka_1_1media_1_1SubsampleEntry.html">SubsampleEntry</a>& subsample : subsamples) {</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">if</span> (subsample.clear_bytes > 0) {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  memcpy(dest, source, subsample.clear_bytes);</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  source += subsample.clear_bytes;</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  dest += subsample.clear_bytes;</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  total_size += subsample.clear_bytes;</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  }</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span> (subsample.cipher_bytes > 0) {</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  EncryptBytes(source, subsample.cipher_bytes, dest);</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  source += subsample.cipher_bytes;</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  dest += subsample.cipher_bytes;</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  total_size += subsample.cipher_bytes;</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  }</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  DCHECK_EQ(total_size, clear_sample->data_size());</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  EncryptBytes(source, clear_sample->data_size(), dest);</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  }</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> </div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  std::shared_ptr<MediaSample> cipher_sample(clear_sample->Clone());</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  cipher_sample->TransferData(std::move(cipher_sample_data),</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  clear_sample->data_size());</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="comment">// Finish initializing the sample before sending it downstream. We must</span></div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="comment">// wait until now to finish the initialization as we will lose access to</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="comment">// |decrypt_config| once we set it.</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  cipher_sample->set_is_encrypted(<span class="keyword">true</span>);</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  std::unique_ptr<DecryptConfig> decrypt_config(<span class="keyword">new</span> <a class="code" href="../../de/d49/classshaka_1_1media_1_1DecryptConfig.html">DecryptConfig</a>(</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  encryption_config_->key_id, encryptor_->iv(), subsamples,</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  protection_scheme_, crypt_byte_block_, skip_byte_block_));</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  cipher_sample->set_decrypt_config(std::move(decrypt_config));</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> </div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  encryptor_->UpdateIv();</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">return</span> DispatchMediaSample(kStreamIndex, std::move(cipher_sample));</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> }</div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span> </div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="keywordtype">void</span> EncryptionHandler::SetupProtectionPattern(StreamType stream_type) {</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="keywordflow">if</span> (stream_type == kStreamVideo &&</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  IsPatternEncryptionScheme(protection_scheme_)) {</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="comment">// Use 1:9 pattern.</span></div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  crypt_byte_block_ = 1u;</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  skip_byte_block_ = 9u;</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="comment">// Audio stream in pattern encryption scheme does not use pattern; it uses</span></div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="comment">// whole-block full sample encryption instead. Non-pattern encryption does</span></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">// not have pattern.</span></div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  crypt_byte_block_ = 0u;</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  skip_byte_block_ = 0u;</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  }</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> }</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span> </div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="keywordtype">bool</span> EncryptionHandler::CreateEncryptor(<span class="keyword">const</span> <a class="code" href="../../dd/dbd/structshaka_1_1media_1_1EncryptionKey.html">EncryptionKey</a>& encryption_key) {</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  std::unique_ptr<AesCryptor> encryptor = encryptor_factory_->CreateEncryptor(</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  protection_scheme_, crypt_byte_block_, skip_byte_block_, codec_,</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  encryption_key.key, encryption_key.iv);</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">if</span> (!encryptor)</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  encryptor_ = std::move(encryptor);</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  encryption_config_.reset(<span class="keyword">new</span> <a class="code" href="../../d7/d34/structshaka_1_1media_1_1EncryptionConfig.html">EncryptionConfig</a>);</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  encryption_config_->protection_scheme = protection_scheme_;</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  encryption_config_->crypt_byte_block = crypt_byte_block_;</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  encryption_config_->skip_byte_block = skip_byte_block_;</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keyword">const</span> std::vector<uint8_t>& iv = encryptor_->iv();</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordflow">if</span> (encryptor_->use_constant_iv()) {</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  encryption_config_->per_sample_iv_size = 0;</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  encryption_config_->constant_iv = iv;</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  encryption_config_->per_sample_iv_size = <span class="keyword">static_cast<</span>uint8_t<span class="keyword">></span>(iv.size());</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  }</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  encryption_config_->key_id = encryption_key.key_id;</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  encryption_config_->key_system_info = encryption_key.key_system_info;</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> }</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="keywordtype">void</span> EncryptionHandler::EncryptBytes(<span class="keyword">const</span> uint8_t* source,</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordtype">size_t</span> source_size,</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  uint8_t* dest) {</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  DCHECK(source);</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  DCHECK(dest);</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  DCHECK(encryptor_);</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  CHECK(encryptor_->Crypt(source, source_size, dest));</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span> }</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span> </div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="keywordtype">void</span> EncryptionHandler::InjectSubsampleGeneratorForTesting(</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  std::unique_ptr<SubsampleGenerator> generator) {</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  subsample_generator_ = std::move(generator);</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> }</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> </div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="keywordtype">void</span> EncryptionHandler::InjectEncryptorFactoryForTesting(</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  std::unique_ptr<AesEncryptorFactory> encryptor_factory) {</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  encryptor_factory_ = std::move(encryptor_factory);</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> }</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span> </div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> } <span class="comment">// namespace media</span></div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> } <span class="comment">// namespace shaka</span></div><div class="ttc" id="classshaka_1_1media_1_1StreamInfo_html"><div class="ttname"><a href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html">shaka::media::StreamInfo</a></div><div class="ttdoc">Abstract class holds stream information. </div><div class="ttdef"><b>Definition:</b> <a href="../../d8/daa/stream__info_8h_source.html#l00061">stream_info.h:61</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1StreamInfo_html_afdd9b2df8ae1c11bb033c44eaba5e38d"><div class="ttname"><a href="../../d5/db1/classshaka_1_1media_1_1StreamInfo.html#afdd9b2df8ae1c11bb033c44eaba5e38d">shaka::media::StreamInfo::Clone</a></div><div class="ttdeci">virtual std::unique_ptr< StreamInfo > Clone() const =0</div></div>
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<div class="ttc" id="classshaka_1_1media_1_1DecryptConfig_html"><div class="ttname"><a href="../../de/d49/classshaka_1_1media_1_1DecryptConfig.html">shaka::media::DecryptConfig</a></div><div class="ttdef"><b>Definition:</b> <a href="../../df/dad/decrypt__config_8h_source.html#l00040">decrypt_config.h:40</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1SubsampleEntry_html"><div class="ttname"><a href="../../d1/d34/structshaka_1_1media_1_1SubsampleEntry.html">shaka::media::SubsampleEntry</a></div><div class="ttdef"><b>Definition:</b> <a href="../../df/dad/decrypt__config_8h_source.html#l00028">decrypt_config.h:28</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1SegmentInfo_html"><div class="ttname"><a href="../../d0/dc0/structshaka_1_1media_1_1SegmentInfo.html">shaka::media::SegmentInfo</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d93/media__handler_8h_source.html#l00055">media_handler.h:55</a></div></div>
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<div class="ttc" id="namespaceshaka_html"><div class="ttname"><a href="../../d8/daf/namespaceshaka.html">shaka</a></div><div class="ttdoc">All the methods that are virtual are virtual for mocking. </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011">gflags_hex_bytes.cc:11</a></div></div>
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<div class="ttc" id="classshaka_1_1Status_html"><div class="ttname"><a href="../../d2/d20/classshaka_1_1Status.html">shaka::Status</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d13/status_8h_source.html#l00110">status.h:110</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1EncryptionHandler_html_a3f1808a4386081e5e1c9a798a1a69dd0"><div class="ttname"><a href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a3f1808a4386081e5e1c9a798a1a69dd0">shaka::media::EncryptionHandler::InitializeInternal</a></div><div class="ttdeci">Status InitializeInternal() override</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d9c/encryption__handler_8cc_source.html#l00082">encryption_handler.cc:82</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1EncryptionHandler_html_a7887e6060eb572036674ecb9a7e045c4"><div class="ttname"><a href="../../d6/d4c/classshaka_1_1media_1_1EncryptionHandler.html#a7887e6060eb572036674ecb9a7e045c4">shaka::media::EncryptionHandler::Process</a></div><div class="ttdeci">Status Process(std::unique_ptr< StreamData > stream_data) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/d9c/encryption__handler_8cc_source.html#l00093">encryption_handler.cc:93</a></div></div>
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<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#l00038">key_source.h:38</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1EncryptionConfig_html"><div class="ttname"><a href="../../d7/d34/structshaka_1_1media_1_1EncryptionConfig.html">shaka::media::EncryptionConfig</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d05/encryption__config_8h_source.html#l00016">encryption_config.h:16</a></div></div>
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