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<div class="title">encrypting_fragmenter.cc</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2014 Google Inc. All rights reserved.</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">//</span></div>
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<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>
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<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>
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<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>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> </div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="preprocessor">#include "packager/media/formats/mp4/encrypting_fragmenter.h"</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <limits></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "packager/media/base/aes_encryptor.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/media/base/aes_pattern_cryptor.h"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "packager/media/base/buffer_reader.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "packager/media/base/key_source.h"</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include "packager/media/base/media_sample.h"</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include "packager/media/codecs/nalu_reader.h"</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include "packager/media/codecs/vp8_parser.h"</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "packager/media/codecs/vp9_parser.h"</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "packager/media/formats/mp4/box_definitions.h"</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> </div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="keyword">namespace </span>mp4 {</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">const</span> <span class="keywordtype">size_t</span> kCencBlockSize = 16u;</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// Adds one or more subsamples to |*subsamples|. This may add more than one</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">// if one of the values overflows the integer in the subsample.</span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="keywordtype">void</span> AddSubsamples(uint64_t clear_bytes,</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  uint64_t cipher_bytes,</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  std::vector<SubsampleEntry>* subsamples) {</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  CHECK_LT(cipher_bytes, std::numeric_limits<uint32_t>::max());</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> uint64_t kUInt16Max = std::numeric_limits<uint16_t>::max();</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">while</span> (clear_bytes > kUInt16Max) {</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  subsamples->push_back(SubsampleEntry(kUInt16Max, 0));</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  clear_bytes -= kUInt16Max;</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  }</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">if</span> (clear_bytes > 0 || cipher_bytes > 0)</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  subsamples->push_back(SubsampleEntry(clear_bytes, cipher_bytes));</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> }</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> VideoCodec GetVideoCodec(<span class="keyword">const</span> StreamInfo& stream_info) {</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">if</span> (stream_info.stream_type() != kStreamVideo)</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">return</span> kUnknownVideoCodec;</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">const</span> VideoStreamInfo& video_stream_info =</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">static_cast<</span><span class="keyword">const </span>VideoStreamInfo&<span class="keyword">></span>(stream_info);</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">return</span> video_stream_info.codec();</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> }</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> uint8_t GetNaluLengthSize(<span class="keyword">const</span> StreamInfo& stream_info) {</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">if</span> (stream_info.stream_type() != kStreamVideo)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">const</span> VideoStreamInfo& video_stream_info =</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">static_cast<</span><span class="keyword">const </span>VideoStreamInfo&<span class="keyword">></span>(stream_info);</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> video_stream_info.nalu_length_size();</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> }</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> </div>
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<div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a13593e29b7d9d1b9e133e6470539ca48"> 62</a></span> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a13593e29b7d9d1b9e133e6470539ca48">EncryptingFragmenter::EncryptingFragmenter</a>(</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  scoped_refptr<StreamInfo> info,</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="../../df/d7b/structshaka_1_1media_1_1mp4_1_1TrackFragment.html">TrackFragment</a>* traf,</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  scoped_ptr<EncryptionKey> encryption_key,</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  int64_t clear_time,</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  FourCC protection_scheme,</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  uint8_t crypt_byte_block,</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  uint8_t skip_byte_block)</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  : <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html">Fragmenter</a>(info, traf),</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  info_(info),</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  encryption_key_(encryption_key.Pass()),</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  nalu_length_size_(GetNaluLengthSize(*info)),</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  video_codec_(GetVideoCodec(*info)),</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  clear_time_(clear_time),</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  protection_scheme_(protection_scheme),</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  crypt_byte_block_(crypt_byte_block),</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  skip_byte_block_(skip_byte_block) {</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  DCHECK(encryption_key_);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">switch</span> (video_codec_) {</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">case</span> kCodecVP8:</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  vpx_parser_.reset(<span class="keyword">new</span> <a class="code" href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html">VP8Parser</a>);</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">case</span> kCodecVP9:</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  vpx_parser_.reset(<span class="keyword">new</span> <a class="code" href="../../db/d5a/classshaka_1_1media_1_1VP9Parser.html">VP9Parser</a>);</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">case</span> kCodecH264:</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  header_parser_.reset(<span class="keyword">new</span> <a class="code" href="../../da/df0/classshaka_1_1media_1_1H264VideoSliceHeaderParser.html">H264VideoSliceHeaderParser</a>);</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">case</span> kCodecHVC1:</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  FALLTHROUGH_INTENDED;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">case</span> kCodecHEV1:</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  header_parser_.reset(<span class="keyword">new</span> <a class="code" href="../../d1/d79/classshaka_1_1media_1_1H265VideoSliceHeaderParser.html">H265VideoSliceHeaderParser</a>);</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">default</span>:</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (nalu_length_size_ > 0) {</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  LOG(WARNING) << <span class="stringliteral">"Unknown video codec '"</span> << video_codec_</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  << <span class="stringliteral">"', whole subsamples will be encrypted."</span>;</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  }</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> }</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> </div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> EncryptingFragmenter::~EncryptingFragmenter() {}</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> </div>
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<div class="line"><a name="l00105"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#afeb03755fa2e6a53376ae5ceb7440021"> 105</a></span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#afeb03755fa2e6a53376ae5ceb7440021">EncryptingFragmenter::AddSample</a>(scoped_refptr<MediaSample> sample) {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  DCHECK(sample);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (!fragment_initialized()) {</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> status = <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a126294f104809268975fe04391902ad3">InitializeFragment</a>(sample->dts());</div>
|
|
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (!status.ok())</div>
|
|
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> status;</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>  <span class="keywordflow">if</span> (encryptor_) {</div>
|
|
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> status = EncryptSample(sample);</div>
|
|
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">if</span> (!status.ok())</div>
|
|
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">return</span> status;</div>
|
|
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  }</div>
|
|
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">return</span> <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a684c1f318ac05e85f4dbf373ea65b7ad">Fragmenter::AddSample</a>(sample);</div>
|
|
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> }</div>
|
|
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> </div>
|
|
<div class="line"><a name="l00120"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a126294f104809268975fe04391902ad3"> 120</a></span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a126294f104809268975fe04391902ad3">EncryptingFragmenter::InitializeFragment</a>(int64_t first_sample_dts) {</div>
|
|
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> status = <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a">Fragmenter::InitializeFragment</a>(first_sample_dts);</div>
|
|
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (!status.ok())</div>
|
|
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">return</span> status;</div>
|
|
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
|
|
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (header_parser_ && !header_parser_->Initialize(info_->extra_data()))</div>
|
|
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <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">"Fail to read SPS and PPS data."</span>);</div>
|
|
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div>
|
|
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  traf()->auxiliary_size.sample_info_sizes.clear();</div>
|
|
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  traf()->auxiliary_offset.offsets.clear();</div>
|
|
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (IsSubsampleEncryptionRequired()) {</div>
|
|
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  traf()->sample_encryption.flags |=</div>
|
|
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  SampleEncryption::kUseSubsampleEncryption;</div>
|
|
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div>
|
|
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  traf()->sample_encryption.sample_encryption_entries.clear();</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>  <span class="keyword">const</span> <span class="keywordtype">bool</span> enable_encryption = clear_time_ <= 0;</div>
|
|
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (!enable_encryption) {</div>
|
|
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">// This fragment should be in clear text.</span></div>
|
|
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="comment">// At most two sample description entries, an encrypted entry and a clear</span></div>
|
|
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="comment">// entry, are generated. The 1-based clear entry index is always 2.</span></div>
|
|
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">const</span> uint32_t kClearSampleDescriptionIndex = 2;</div>
|
|
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> </div>
|
|
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  traf()->header.flags |=</div>
|
|
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  TrackFragmentHeader::kSampleDescriptionIndexPresentMask;</div>
|
|
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  traf()->header.sample_description_index = kClearSampleDescriptionIndex;</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>  <span class="keywordflow">return</span> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#ace1882cf57dab24ee8e38765675e69a1">PrepareFragmentForEncryption</a>(enable_encryption);</div>
|
|
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> }</div>
|
|
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div>
|
|
<div class="line"><a name="l00150"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a0de01823838c543cb8f6f8e330712ac2"> 150</a></span> <span class="keywordtype">void</span> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a0de01823838c543cb8f6f8e330712ac2">EncryptingFragmenter::FinalizeFragment</a>() {</div>
|
|
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">if</span> (encryptor_) {</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  DCHECK_LE(clear_time_, 0);</div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a5cfbe43af4b1617853cef5fc2243003b">FinalizeFragmentForEncryption</a>();</div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  DCHECK_GT(clear_time_, 0);</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  clear_time_ -= fragment_duration();</div>
|
|
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
|
|
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a0295126af5e6b278a980021f43ae17ea">Fragmenter::FinalizeFragment</a>();</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> }</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> </div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#ace1882cf57dab24ee8e38765675e69a1"> 161</a></span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#ace1882cf57dab24ee8e38765675e69a1">EncryptingFragmenter::PrepareFragmentForEncryption</a>(</div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordtype">bool</span> enable_encryption) {</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> (!enable_encryption || encryptor_) ? Status::OK : <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a4220479b2dd98b462ff4dd4afcf56d0e">CreateEncryptor</a>();</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
|
|
<div class="line"><a name="l00166"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a5cfbe43af4b1617853cef5fc2243003b"> 166</a></span> <span class="keywordtype">void</span> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a5cfbe43af4b1617853cef5fc2243003b">EncryptingFragmenter::FinalizeFragmentForEncryption</a>() {</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">// The offset will be adjusted in Segmenter after knowing moof size.</span></div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  traf()->auxiliary_offset.offsets.push_back(0);</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>  <span class="comment">// For 'cbcs' scheme, Constant IVs SHALL be used.</span></div>
|
|
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> per_sample_iv_size =</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  (protection_scheme_ == FOURCC_cbcs) ? 0 : encryptor_->iv().size();</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  traf()->sample_encryption.iv_size = per_sample_iv_size;</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">// Optimize saiz box.</span></div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <a class="code" href="../../dd/d13/structshaka_1_1media_1_1mp4_1_1SampleAuxiliaryInformationSize.html">SampleAuxiliaryInformationSize</a>& saiz = traf()->auxiliary_size;</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  saiz.sample_count = traf()->runs[0].sample_sizes.size();</div>
|
|
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">if</span> (!saiz.sample_info_sizes.empty()) {</div>
|
|
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keywordflow">if</span> (!<a class="code" href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">OptimizeSampleEntries</a>(&saiz.sample_info_sizes,</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  &saiz.default_sample_info_size)) {</div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  saiz.default_sample_info_size = 0;</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  }</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">// |sample_info_sizes| table is filled in only for subsample encryption,</span></div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// otherwise |sample_info_size| is just the IV size.</span></div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  DCHECK(!IsSubsampleEncryptionRequired());</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  saiz.default_sample_info_size = per_sample_iv_size;</div>
|
|
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  }</div>
|
|
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="comment">// It should only happen with full sample encryption + constant iv, which is</span></div>
|
|
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="comment">// not a legal combination.</span></div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  CHECK(!saiz.sample_info_sizes.empty() || saiz.default_sample_info_size != 0);</div>
|
|
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> }</div>
|
|
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div>
|
|
<div class="line"><a name="l00194"></a><span class="lineno"><a class="line" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a4220479b2dd98b462ff4dd4afcf56d0e"> 194</a></span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> <a class="code" href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a4220479b2dd98b462ff4dd4afcf56d0e">EncryptingFragmenter::CreateEncryptor</a>() {</div>
|
|
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  DCHECK(encryption_key_);</div>
|
|
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  scoped_ptr<AesCryptor> encryptor;</div>
|
|
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">switch</span> (protection_scheme_) {</div>
|
|
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <span class="keywordflow">case</span> FOURCC_cenc:</div>
|
|
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  encryptor.reset(<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="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">case</span> FOURCC_cbc1:</div>
|
|
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  encryptor.reset(<span class="keyword">new</span> <a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a>(kNoPadding));</div>
|
|
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">case</span> FOURCC_cens:</div>
|
|
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  encryptor.reset(<span class="keyword">new</span> <a class="code" href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html">AesPatternCryptor</a>(</div>
|
|
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  crypt_byte_block(), skip_byte_block(),</div>
|
|
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <a class="code" href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html#a54fd35d7782d3b4948c7eb68387711f0a76b19d202e22b2b0f661f933b47b3b16">AesPatternCryptor::kEncryptIfCryptByteBlockRemaining</a>,</div>
|
|
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  AesCryptor::kDontUseConstantIv,</div>
|
|
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  scoped_ptr<AesCryptor>(<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="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keywordflow">case</span> FOURCC_cbcs:</div>
|
|
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  encryptor.reset(<span class="keyword">new</span> <a class="code" href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html">AesPatternCryptor</a>(</div>
|
|
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  crypt_byte_block(), skip_byte_block(),</div>
|
|
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <a class="code" href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html#a54fd35d7782d3b4948c7eb68387711f0a76b19d202e22b2b0f661f933b47b3b16">AesPatternCryptor::kEncryptIfCryptByteBlockRemaining</a>,</div>
|
|
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  AesCryptor::kUseConstantIv,</div>
|
|
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  scoped_ptr<AesCryptor>(<span class="keyword">new</span> <a class="code" href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">AesCbcEncryptor</a>(kNoPadding))));</div>
|
|
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keywordflow">break</span>;</div>
|
|
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">default</span>:</div>
|
|
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <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">"Unsupported protection scheme."</span>);</div>
|
|
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  }</div>
|
|
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> </div>
|
|
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  DCHECK(!encryption_key_->iv.empty());</div>
|
|
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> initialized =</div>
|
|
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  encryptor->InitializeWithIv(encryption_key_->key, encryption_key_->iv);</div>
|
|
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordflow">if</span> (!initialized)</div>
|
|
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <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">"Failed to create the encryptor."</span>);</div>
|
|
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  encryptor_ = encryptor.Pass();</div>
|
|
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">return</span> Status::OK;</div>
|
|
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> }</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> <span class="keywordtype">void</span> EncryptingFragmenter::EncryptBytes(uint8_t* data, uint32_t size) {</div>
|
|
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  DCHECK(encryptor_);</div>
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|
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  CHECK(encryptor_->Crypt(data, size, data));</div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> }</div>
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> </div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <a class="code" href="../../d0/d93/classshaka_1_1media_1_1Status.html">Status</a> EncryptingFragmenter::EncryptSample(scoped_refptr<MediaSample> sample) {</div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  DCHECK(encryptor_);</div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  SampleEncryptionEntry sample_encryption_entry;</div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  <span class="comment">// For 'cbcs' scheme, Constant IVs SHALL be used.</span></div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keywordflow">if</span> (protection_scheme_ != FOURCC_cbcs)</div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  sample_encryption_entry.initialization_vector = encryptor_->iv();</div>
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<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  uint8_t* data = sample->writable_data();</div>
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<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keywordflow">if</span> (IsSubsampleEncryptionRequired()) {</div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">if</span> (vpx_parser_) {</div>
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<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  std::vector<VPxFrameInfo> vpx_frames;</div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (!vpx_parser_->Parse(sample->data(), sample->data_size(),</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  &vpx_frames)) {</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <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">"Failed to parse vpx frame."</span>);</div>
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<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  }</div>
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<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> </div>
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<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> is_superframe = vpx_frames.size() > 1;</div>
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<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">for</span> (<span class="keyword">const</span> VPxFrameInfo& frame : vpx_frames) {</div>
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<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  SubsampleEntry subsample;</div>
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<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  subsample.clear_bytes = frame.uncompressed_header_size;</div>
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<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  subsample.cipher_bytes =</div>
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<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  frame.frame_size - frame.uncompressed_header_size;</div>
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<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
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<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">// "VP Codec ISO Media File Format Binding" document requires that the</span></div>
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<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="comment">// encrypted bytes of each frame within the superframe must be block</span></div>
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<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="comment">// aligned so that the counter state can be computed for each frame</span></div>
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<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="comment">// within the superframe.</span></div>
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<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <span class="comment">// ISO/IEC 23001-7:2016 10.2 'cbc1' 10.3 'cens'</span></div>
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<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="comment">// The BytesOfProtectedData size SHALL be a multiple of 16 bytes to</span></div>
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<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="comment">// avoid partial blocks in Subsamples.</span></div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">if</span> (is_superframe || protection_scheme_ == FOURCC_cbc1 ||</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  protection_scheme_ == FOURCC_cens) {</div>
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|
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keyword">const</span> uint16_t misalign_bytes =</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  subsample.cipher_bytes % kCencBlockSize;</div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  subsample.clear_bytes += misalign_bytes;</div>
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<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  subsample.cipher_bytes -= misalign_bytes;</div>
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<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div>
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<div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div>
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<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  sample_encryption_entry.subsamples.push_back(subsample);</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">if</span> (subsample.cipher_bytes > 0)</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  EncryptBytes(data + subsample.clear_bytes, subsample.cipher_bytes);</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  data += frame.frame_size;</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  }</div>
|
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  } <span class="keywordflow">else</span> {</div>
|
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keyword">const</span> Nalu::CodecType nalu_type =</div>
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|
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  (video_codec_ == kCodecHVC1 || video_codec_ == kCodecHEV1)</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  ? Nalu::kH265</div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  : Nalu::kH264;</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  NaluReader reader(nalu_type, nalu_length_size_, data,</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  sample->data_size());</div>
|
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<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div>
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<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="comment">// Store the current length of clear data. This is used to squash</span></div>
|
|
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="comment">// multiple unencrypted NAL units into fewer subsample entries.</span></div>
|
|
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  uint64_t accumulated_clear_bytes = 0;</div>
|
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<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> </div>
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<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  Nalu nalu;</div>
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<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  NaluReader::Result result;</div>
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<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">while</span> ((result = reader.Advance(&nalu)) == NaluReader::kOk) {</div>
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<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keywordflow">if</span> (nalu.is_video_slice()) {</div>
|
|
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="comment">// For video-slice NAL units, encrypt the video slice. This skips</span></div>
|
|
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="comment">// the frame header. If this is an unrecognized codec (e.g. H.265),</span></div>
|
|
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  <span class="comment">// the whole NAL unit will be encrypted.</span></div>
|
|
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="keyword">const</span> int64_t video_slice_header_size =</div>
|
|
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  header_parser_ ? header_parser_->GetHeaderSize(nalu) : 0;</div>
|
|
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">if</span> (video_slice_header_size < 0)</div>
|
|
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">return</span> Status(error::MUXER_FAILURE, <span class="stringliteral">"Failed to read slice header."</span>);</div>
|
|
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> </div>
|
|
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  uint64_t current_clear_bytes =</div>
|
|
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  nalu.header_size() + video_slice_header_size;</div>
|
|
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  uint64_t cipher_bytes = nalu.payload_size() - video_slice_header_size;</div>
|
|
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
|
|
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="comment">// ISO/IEC 23001-7:2016 10.2 'cbc1' 10.3 'cens'</span></div>
|
|
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="comment">// The BytesOfProtectedData size SHALL be a multiple of 16 bytes to</span></div>
|
|
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="comment">// avoid partial blocks in Subsamples.</span></div>
|
|
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">if</span> (protection_scheme_ == FOURCC_cbc1 ||</div>
|
|
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  protection_scheme_ == FOURCC_cens) {</div>
|
|
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keyword">const</span> uint16_t misalign_bytes = cipher_bytes % kCencBlockSize;</div>
|
|
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  current_clear_bytes += misalign_bytes;</div>
|
|
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  cipher_bytes -= misalign_bytes;</div>
|
|
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  }</div>
|
|
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> </div>
|
|
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  <span class="keyword">const</span> uint8_t* nalu_data = nalu.data() + current_clear_bytes;</div>
|
|
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  EncryptBytes(const_cast<uint8_t*>(nalu_data), cipher_bytes);</div>
|
|
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div>
|
|
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  AddSubsamples(</div>
|
|
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  accumulated_clear_bytes + nalu_length_size_ + current_clear_bytes,</div>
|
|
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  cipher_bytes, &sample_encryption_entry.subsamples);</div>
|
|
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  accumulated_clear_bytes = 0;</div>
|
|
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="comment">// For non-video-slice NAL units, don't encrypt.</span></div>
|
|
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  accumulated_clear_bytes +=</div>
|
|
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  nalu_length_size_ + nalu.header_size() + nalu.payload_size();</div>
|
|
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  }</div>
|
|
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div>
|
|
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="keywordflow">if</span> (result != NaluReader::kEOStream)</div>
|
|
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <span class="keywordflow">return</span> Status(error::MUXER_FAILURE, <span class="stringliteral">"Failed to parse NAL units."</span>);</div>
|
|
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  AddSubsamples(accumulated_clear_bytes, 0,</div>
|
|
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  &sample_encryption_entry.subsamples);</div>
|
|
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  }</div>
|
|
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div>
|
|
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="comment">// The length of per-sample auxiliary datum, defined in CENC ch. 7.</span></div>
|
|
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  traf()->auxiliary_size.sample_info_sizes.push_back(</div>
|
|
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  sample_encryption_entry.ComputeSize());</div>
|
|
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  } <span class="keywordflow">else</span> {</div>
|
|
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  EncryptBytes(data, sample->data_size());</div>
|
|
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  }</div>
|
|
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> </div>
|
|
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  traf()->sample_encryption.sample_encryption_entries.push_back(</div>
|
|
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  sample_encryption_entry);</div>
|
|
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  encryptor_->UpdateIv();</div>
|
|
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <span class="keywordflow">return</span> Status::OK;</div>
|
|
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> }</div>
|
|
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> </div>
|
|
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="keywordtype">bool</span> EncryptingFragmenter::IsSubsampleEncryptionRequired() {</div>
|
|
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordflow">return</span> vpx_parser_ || nalu_length_size_ != 0;</div>
|
|
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> }</div>
|
|
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
|
|
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> } <span class="comment">// namespace mp4</span></div>
|
|
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> } <span class="comment">// namespace media</span></div>
|
|
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> } <span class="comment">// namespace shaka</span></div>
|
|
<div class="ttc" id="classshaka_1_1media_1_1H265VideoSliceHeaderParser_html"><div class="ttname"><a href="../../d1/d79/classshaka_1_1media_1_1H265VideoSliceHeaderParser.html">shaka::media::H265VideoSliceHeaderParser</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d33/video__slice__header__parser_8h_source.html#l00053">video_slice_header_parser.h:53</a></div></div>
|
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_afeb03755fa2e6a53376ae5ceb7440021"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#afeb03755fa2e6a53376ae5ceb7440021">shaka::media::mp4::EncryptingFragmenter::AddSample</a></div><div class="ttdeci">Status AddSample(scoped_refptr< MediaSample > sample) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00105">encrypting_fragmenter.cc:105</a></div></div>
|
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_a126294f104809268975fe04391902ad3"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a126294f104809268975fe04391902ad3">shaka::media::mp4::EncryptingFragmenter::InitializeFragment</a></div><div class="ttdeci">Status InitializeFragment(int64_t first_sample_dts) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00120">encrypting_fragmenter.cc:120</a></div></div>
|
|
<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1TrackFragment_html"><div class="ttname"><a href="../../df/d7b/structshaka_1_1media_1_1mp4_1_1TrackFragment.html">shaka::media::mp4::TrackFragment</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00728">box_definitions.h:728</a></div></div>
|
|
<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a684c1f318ac05e85f4dbf373ea65b7ad"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a684c1f318ac05e85f4dbf373ea65b7ad">shaka::media::mp4::Fragmenter::AddSample</a></div><div class="ttdeci">virtual Status AddSample(scoped_refptr< MediaSample > sample)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00045">fragmenter.cc:45</a></div></div>
|
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_a0de01823838c543cb8f6f8e330712ac2"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a0de01823838c543cb8f6f8e330712ac2">shaka::media::mp4::EncryptingFragmenter::FinalizeFragment</a></div><div class="ttdeci">void FinalizeFragment() override</div><div class="ttdoc">Finalize and optimize the fragment. </div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00150">encrypting_fragmenter.cc:150</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_aa702c2af5ea5096d94f2943076a21e4a"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#aa702c2af5ea5096d94f2943076a21e4a">shaka::media::mp4::Fragmenter::InitializeFragment</a></div><div class="ttdeci">virtual Status InitializeFragment(int64_t first_sample_dts)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00085">fragmenter.cc:85</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesPatternCryptor_html_a54fd35d7782d3b4948c7eb68387711f0a76b19d202e22b2b0f661f933b47b3b16"><div class="ttname"><a href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html#a54fd35d7782d3b4948c7eb68387711f0a76b19d202e22b2b0f661f933b47b3b16">shaka::media::AesPatternCryptor::kEncryptIfCryptByteBlockRemaining</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d09/aes__pattern__cryptor_8h_source.html#l00025">aes_pattern_cryptor.h:25</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_a13593e29b7d9d1b9e133e6470539ca48"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a13593e29b7d9d1b9e133e6470539ca48">shaka::media::mp4::EncryptingFragmenter::EncryptingFragmenter</a></div><div class="ttdeci">EncryptingFragmenter(scoped_refptr< StreamInfo > info, TrackFragment *traf, scoped_ptr< EncryptionKey > encryption_key, int64_t clear_time, FourCC protection_scheme, uint8_t crypt_byte_block, uint8_t skip_byte_block)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00062">encrypting_fragmenter.cc:62</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1VP8Parser_html"><div class="ttname"><a href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html">shaka::media::VP8Parser</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/d65/vp8__parser_8h_source.html#l00021">vp8_parser.h:21</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a0295126af5e6b278a980021f43ae17ea"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a0295126af5e6b278a980021f43ae17ea">shaka::media::mp4::Fragmenter::FinalizeFragment</a></div><div class="ttdeci">virtual void FinalizeFragment()</div><div class="ttdoc">Finalize and optimize the fragment. </div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d9a/fragmenter_8cc_source.html#l00104">fragmenter.cc:104</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1AesCbcEncryptor_html"><div class="ttname"><a href="../../d4/d20/classshaka_1_1media_1_1AesCbcEncryptor.html">shaka::media::AesCbcEncryptor</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d1/df0/aes__encryptor_8h_source.html#l00078">aes_encryptor.h:78</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_a5cfbe43af4b1617853cef5fc2243003b"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a5cfbe43af4b1617853cef5fc2243003b">shaka::media::mp4::EncryptingFragmenter::FinalizeFragmentForEncryption</a></div><div class="ttdeci">virtual void FinalizeFragmentForEncryption()</div><div class="ttdoc">Finalize current fragment for encryption. </div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00166">encrypting_fragmenter.cc:166</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html">shaka::media::mp4::Fragmenter</a></div><div class="ttdef"><b>Definition:</b> <a href="../../da/dd1/fragmenter_8h_source.html#l00031">fragmenter.h:31</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1H264VideoSliceHeaderParser_html"><div class="ttname"><a href="../../da/df0/classshaka_1_1media_1_1H264VideoSliceHeaderParser.html">shaka::media::H264VideoSliceHeaderParser</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d33/video__slice__header__parser_8h_source.html#l00036">video_slice_header_parser.h:36</a></div></div>
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<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>
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<div class="ttc" id="classshaka_1_1media_1_1AesPatternCryptor_html"><div class="ttname"><a href="../../d3/dfe/classshaka_1_1media_1_1AesPatternCryptor.html">shaka::media::AesPatternCryptor</a></div><div class="ttdoc">Implements pattern-based encryption/decryption. </div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d09/aes__pattern__cryptor_8h_source.html#l00016">aes_pattern_cryptor.h:16</a></div></div>
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<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#l00043">aes_encryptor.h:43</a></div></div>
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<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#l00075">status.h:75</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1mp4_1_1SampleAuxiliaryInformationSize_html"><div class="ttname"><a href="../../dd/d13/structshaka_1_1media_1_1mp4_1_1SampleAuxiliaryInformationSize.html">shaka::media::mp4::SampleAuxiliaryInformationSize</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d5/d7b/box__definitions_8h_source.html#l00069">box_definitions.h:69</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_a4220479b2dd98b462ff4dd4afcf56d0e"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#a4220479b2dd98b462ff4dd4afcf56d0e">shaka::media::mp4::EncryptingFragmenter::CreateEncryptor</a></div><div class="ttdeci">Status CreateEncryptor()</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00194">encrypting_fragmenter.cc:194</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter_html_ace1882cf57dab24ee8e38765675e69a1"><div class="ttname"><a href="../../dc/df3/classshaka_1_1media_1_1mp4_1_1EncryptingFragmenter.html#ace1882cf57dab24ee8e38765675e69a1">shaka::media::mp4::EncryptingFragmenter::PrepareFragmentForEncryption</a></div><div class="ttdeci">virtual Status PrepareFragmentForEncryption(bool enable_encryption)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d41/encrypting__fragmenter_8cc_source.html#l00161">encrypting_fragmenter.cc:161</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1mp4_1_1Fragmenter_html_a208b7b8dd83e73c4206469695a3216d4"><div class="ttname"><a href="../../db/d95/classshaka_1_1media_1_1mp4_1_1Fragmenter.html#a208b7b8dd83e73c4206469695a3216d4">shaka::media::mp4::Fragmenter::OptimizeSampleEntries</a></div><div class="ttdeci">bool OptimizeSampleEntries(std::vector< T > *entries, T *default_value)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/dd1/fragmenter_8h_source.html#l00092">fragmenter.h:92</a></div></div>
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