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<div class="title">vp8_parser.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 2015 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/codecs/vp8_parser.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 "packager/base/logging.h"</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include "packager/media/base/bit_reader.h"</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/rcheck.h"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>shaka {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">const</span> uint32_t MB_FEATURE_TREE_PROBS = 3;</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">const</span> uint32_t MAX_MB_SEGMENTS = 4;</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="keyword">const</span> uint32_t MAX_REF_LF_DELTAS = 4;</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">const</span> uint32_t MAX_MODE_LF_DELTAS = 4;</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="keyword">const</span> uint32_t MB_LVL_MAX = 2;</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">const</span> uint32_t MB_FEATURE_DATA_BITS[MB_LVL_MAX] = {7, 6};</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="keywordtype">bool</span> VerifySyncCode(<span class="keyword">const</span> uint8_t* data) {</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keywordflow">return</span> data[0] == 0x9d && data[1] == 0x01 && data[2] == 0x2a;</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> }</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="keywordtype">bool</span> ReadSegmentation(BitReader* reader) {</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordtype">bool</span> enabled;</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  RCHECK(reader->ReadBits(1, &enabled));</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">if</span> (!enabled)</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordtype">bool</span> update_map;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  RCHECK(reader->ReadBits(1, &update_map));</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordtype">bool</span> update_data;</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  RCHECK(reader->ReadBits(1, &update_data));</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>  <span class="keywordflow">if</span> (update_data) {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  RCHECK(reader->SkipBits(1)); <span class="comment">// abs_delta</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">for</span> (uint32_t i = 0; i < MAX_MB_SEGMENTS; ++i)</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">for</span> (uint32_t j = 0; j < MB_LVL_MAX; ++j) {</div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, MB_FEATURE_DATA_BITS[j] + 1));</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  }</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  }</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span> (update_map) {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">for</span> (uint32_t i = 0; i < MB_FEATURE_TREE_PROBS; ++i)</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 8));</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  }</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> </div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keywordtype">bool</span> ReadLoopFilter(BitReader* reader) {</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  RCHECK(reader->SkipBits(10)); <span class="comment">// filter_type, filter_evel, sharness_level</span></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="keywordtype">bool</span> mode_ref_delta_enabled;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  RCHECK(reader->ReadBits(1, &mode_ref_delta_enabled));</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (!mode_ref_delta_enabled)</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordtype">bool</span> mode_ref_delta_update;</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  RCHECK(reader->ReadBits(1, &mode_ref_delta_update));</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (!mode_ref_delta_update)</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">for</span> (uint32_t i = 0; i < MAX_REF_LF_DELTAS + MAX_MODE_LF_DELTAS; ++i)</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 6 + 1));</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> }</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keywordtype">bool</span> ReadQuantization(BitReader* reader) {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  uint32_t yac_index;</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  RCHECK(reader->ReadBits(7, &yac_index));</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  VLOG(4) << <span class="stringliteral">"yac_index: "</span> << yac_index;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 4 + 1)); <span class="comment">// y dc delta</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 4 + 1)); <span class="comment">// y2 dc delta</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 4 + 1)); <span class="comment">// y2 ac delta</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 4 + 1)); <span class="comment">// chroma dc delta</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  RCHECK(reader->SkipBitsConditional(<span class="keyword">true</span>, 4 + 1)); <span class="comment">// chroma ac delta</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> </div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keywordtype">bool</span> ReadRefreshFrame(BitReader* reader) {</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordtype">bool</span> refresh_golden_frame;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  RCHECK(reader->ReadBits(1, &refresh_golden_frame));</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordtype">bool</span> refresh_altref_frame;</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  RCHECK(reader->ReadBits(1, &refresh_altref_frame));</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (!refresh_golden_frame)</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  RCHECK(reader->SkipBits(2)); <span class="comment">// buffer copy flag</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (!refresh_altref_frame)</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  RCHECK(reader->SkipBits(2)); <span class="comment">// buffer copy flag</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  RCHECK(reader->SkipBits(2)); <span class="comment">// sign bias flags</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> } <span class="comment">// namespace</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> VP8Parser::VP8Parser() : width_(0), height_(0) {}</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> VP8Parser::~VP8Parser() {}</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"><a class="line" href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1"> 100</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1">VP8Parser::Parse</a>(<span class="keyword">const</span> uint8_t* data,</div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">size_t</span> data_size,</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  std::vector<VPxFrameInfo>* vpx_frames) {</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  DCHECK(data);</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  DCHECK(vpx_frames);</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">BitReader</a> reader(data, data_size);</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="comment">// The following 3 bytes are read directly from |data|.</span></div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a7d349253d5cc8f9aa33f1ca2ea94677c">SkipBytes</a>(3));</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">// One bit for frame type.</span></div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordtype">bool</span> is_interframe = data[0] & 1;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// 3-bit version number with 2 bits for profile and the other bit reserved for</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// future variants.</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  uint8_t profile = (data[0] >> 1) & 3;</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// One bit for show frame flag.</span></div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// Then 19 bits (the remaining 3 bits in the first byte + next two bytes) for</span></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// header size.</span></div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  uint32_t header_size = (data[0] | (data[1] << 8) | (data[2] << 16)) >> 5;</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  RCHECK(header_size <= data_size);</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (!is_interframe) {</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// The following 7 bytes are read directly from |data|.</span></div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a7d349253d5cc8f9aa33f1ca2ea94677c">SkipBytes</a>(7));</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  RCHECK(VerifySyncCode(&data[3]));</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> </div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// Bits 0b11000000 for data[7] and data[9] are scaling.</span></div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  width_ = data[6] | ((data[7] & 0x3f) << 8);</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  height_ = data[8] | ((data[9] & 0x3f) << 8);</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(2)); <span class="comment">// colorspace and pixel value clamping.</span></div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  }</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> </div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  RCHECK(ReadSegmentation(&reader));</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  RCHECK(ReadLoopFilter(&reader));</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(2)); <span class="comment">// partitions bits</span></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  RCHECK(ReadQuantization(&reader));</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span> (is_interframe) {</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  RCHECK(ReadRefreshFrame(&reader));</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(1)); <span class="comment">// refresh_entropy_probs</span></div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(1)); <span class="comment">// refresh last frame flag</span></div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  RCHECK(reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">SkipBits</a>(1)); <span class="comment">// refresh_entropy_probs</span></div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div>
|
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> </div>
|
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">// The next field is entropy header (coef probability tree), which is encoded</span></div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">// using bool entropy encoder, i.e. compressed. We don't consider it as part</span></div>
|
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// of uncompressed header.</span></div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div>
|
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  writable_codec_config()->set_profile(profile);</div>
|
|
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// VP8 uses an 8-bit YUV 4:2:0 format.</span></div>
|
|
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// http://tools.ietf.org/html/rfc6386 Section 2.</span></div>
|
|
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  writable_codec_config()->set_bit_depth(8);</div>
|
|
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  writable_codec_config()->SetChromaSubsampling(</div>
|
|
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  VPCodecConfigurationRecord::CHROMA_420_COLLOCATED_WITH_LUMA);</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> </div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <a class="code" href="../../d0/d11/structshaka_1_1media_1_1VPxFrameInfo.html">VPxFrameInfo</a> vpx_frame;</div>
|
|
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  vpx_frame.frame_size = data_size;</div>
|
|
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  vpx_frame.uncompressed_header_size =</div>
|
|
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  vpx_frame.frame_size - reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a1c1e1225c2780383e72996137bb7f86a">bits_available</a>() / 8;</div>
|
|
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  vpx_frame.is_keyframe = !is_interframe;</div>
|
|
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  vpx_frame.width = width_;</div>
|
|
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  vpx_frame.height = height_;</div>
|
|
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
|
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  vpx_frames->clear();</div>
|
|
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  vpx_frames->push_back(vpx_frame);</div>
|
|
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div>
|
|
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  VLOG(3) << <span class="stringliteral">"\n frame_size: "</span> << vpx_frame.frame_size</div>
|
|
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  << <span class="stringliteral">"\n uncompressed_header_size: "</span></div>
|
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  << vpx_frame.uncompressed_header_size</div>
|
|
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  << <span class="stringliteral">"\n bits read: "</span> << reader.<a class="code" href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a6b7456b84d6b463767127b57cd0dc898">bit_position</a>()</div>
|
|
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  << <span class="stringliteral">"\n header_size: "</span> << header_size</div>
|
|
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  << <span class="stringliteral">"\n width: "</span> << vpx_frame.width</div>
|
|
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  << <span class="stringliteral">"\n height: "</span> << vpx_frame.height;</div>
|
|
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
|
|
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> }</div>
|
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> </div>
|
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<div class="line"><a name="l00179"></a><span class="lineno"><a class="line" href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37"> 179</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37">VP8Parser::IsKeyframe</a>(<span class="keyword">const</span> uint8_t* data, <span class="keywordtype">size_t</span> data_size) {</div>
|
|
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">// Make sure the block is big enough for the minimal keyframe header size.</span></div>
|
|
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (data_size < 10)</div>
|
|
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> </div>
|
|
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="comment">// The LSb of the first byte must be a 0 for a keyframe.</span></div>
|
|
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="keywordflow">if</span> ((data[0] & 0x01) != 0)</div>
|
|
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
|
|
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">return</span> VerifySyncCode(&data[3]);</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> </div>
|
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> } <span class="comment">// namespace media</span></div>
|
|
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> } <span class="comment">// namespace shaka</span></div>
|
|
<div class="ttc" id="classshaka_1_1media_1_1BitReader_html"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html">shaka::media::BitReader</a></div><div class="ttdoc">A class to read bit streams. </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00017">bit_reader.h:17</a></div></div>
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<div class="ttc" id="structshaka_1_1media_1_1VPxFrameInfo_html"><div class="ttname"><a href="../../d0/d11/structshaka_1_1media_1_1VPxFrameInfo.html">shaka::media::VPxFrameInfo</a></div><div class="ttdef"><b>Definition:</b> <a href="../../df/d8a/vpx__parser_8h_source.html#l00019">vpx_parser.h:19</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1VP8Parser_html_a8baec0e4c74b0b220b777426d0c463e1"><div class="ttname"><a href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#a8baec0e4c74b0b220b777426d0c463e1">shaka::media::VP8Parser::Parse</a></div><div class="ttdeci">bool Parse(const uint8_t *data, size_t data_size, std::vector< VPxFrameInfo > *vpx_frames) override</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d70/vp8__parser_8cc_source.html#l00100">vp8_parser.cc:100</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_a4ab20ef220c76072eaecb982aba0541d"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a4ab20ef220c76072eaecb982aba0541d">shaka::media::BitReader::SkipBits</a></div><div class="ttdeci">bool SkipBits(size_t num_bits)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00024">bit_reader.cc:24</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1VP8Parser_html_afae2dcb0c2652d53f2e23c9d3c07db37"><div class="ttname"><a href="../../d8/d14/classshaka_1_1media_1_1VP8Parser.html#afae2dcb0c2652d53f2e23c9d3c07db37">shaka::media::VP8Parser::IsKeyframe</a></div><div class="ttdeci">static bool IsKeyframe(const uint8_t *data, size_t data_size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d70/vp8__parser_8cc_source.html#l00179">vp8_parser.cc:179</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_a7d349253d5cc8f9aa33f1ca2ea94677c"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a7d349253d5cc8f9aa33f1ca2ea94677c">shaka::media::BitReader::SkipBytes</a></div><div class="ttdeci">bool SkipBytes(size_t num_bytes)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/de0/bit__reader_8cc_source.html#l00054">bit_reader.cc:54</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_a1c1e1225c2780383e72996137bb7f86a"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a1c1e1225c2780383e72996137bb7f86a">shaka::media::BitReader::bits_available</a></div><div class="ttdeci">size_t bits_available() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00085">bit_reader.h:85</a></div></div>
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<div class="ttc" id="classshaka_1_1media_1_1BitReader_html_a6b7456b84d6b463767127b57cd0dc898"><div class="ttname"><a href="../../d6/da9/classshaka_1_1media_1_1BitReader.html#a6b7456b84d6b463767127b57cd0dc898">shaka::media::BitReader::bit_position</a></div><div class="ttdeci">size_t bit_position() const </div><div class="ttdef"><b>Definition:</b> <a href="../../d4/dd3/bit__reader_8h_source.html#l00090">bit_reader.h:90</a></div></div>
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