183 lines
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183 lines
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<li class="navelem"><a class="el" href="../../dir_3f8eec2fc361645de4b1ec14c19fffc7.html">packager</a></li><li class="navelem"><a class="el" href="../../dir_f99dae54fe7170f791f339b952d5067a.html">media</a></li><li class="navelem"><a class="el" href="../../dir_375ba2cfd8fd5b05c50b92d996b9d386.html">formats</a></li><li class="navelem"><a class="el" href="../../dir_ae142483ff91a68c468a97c037f98d4d.html">mp4</a></li> </ul>
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<div class="title">box.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 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/box.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/formats/mp4/box_buffer.h"</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  </div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>mp4 {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  </div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> Box::Box() : box_size_(0) {}</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> Box::~Box() {}</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#a209382fcd42e82a896c29e856627ca52"> 19</a></span> <span class="keywordtype">bool</span> Box::Parse(<a class="code" href="../../d1/dee/classshaka_1_1media_1_1mp4_1_1BoxReader.html">BoxReader</a>* reader) {</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  DCHECK(reader);</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">BoxBuffer</a> buffer(reader);</div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  <span class="keywordflow">return</span> ReadWriteInternal(&buffer);</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>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#a15bd0622fdb129d921287e690f117bde"> 25</a></span> <span class="keywordtype">void</span> Box::Write(<a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">BufferWriter</a>* writer) {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  DCHECK(writer);</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// Compute and update box size.</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  uint32_t size = ComputeSize();</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  DCHECK_EQ(size, box_size_);</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordtype">size_t</span> buffer_size_before_write = writer->Size();</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">BoxBuffer</a> buffer(writer);</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  CHECK(ReadWriteInternal(&buffer));</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  DCHECK_EQ(box_size_, writer->Size() - buffer_size_before_write)</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  << FourCCToString(BoxType());</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> }</div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  </div>
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<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#a57b8837c93d51f5cf03d3862069d509a"> 38</a></span> <span class="keywordtype">void</span> Box::WriteHeader(<a class="code" href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">BufferWriter</a>* writer) {</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  DCHECK(writer);</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// Compute and update box size.</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  uint32_t size = ComputeSize();</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  DCHECK_EQ(size, box_size_);</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>  <span class="keywordtype">size_t</span> buffer_size_before_write = writer->Size();</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">BoxBuffer</a> buffer(writer);</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  CHECK(ReadWriteHeaderInternal(&buffer));</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  DCHECK_EQ(HeaderSize(), writer->Size() - buffer_size_before_write);</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> }</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"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#aa4e47d0ba81e234707c76ca36e32c1d5"> 50</a></span> uint32_t Box::ComputeSize() {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  box_size_ = <span class="keyword">static_cast<</span>uint32_t<span class="keyword">></span>(ComputeSizeInternal());</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> box_size_;</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#a07928a0497473150999ceaee018edaa2"> 55</a></span> uint32_t Box::HeaderSize()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">const</span> uint32_t kFourCCSize = 4;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="comment">// We don't support 64-bit size.</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> kFourCCSize + <span class="keyword">sizeof</span>(uint32_t);</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>  </div>
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<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="../../d1/d2d/structshaka_1_1media_1_1mp4_1_1Box.html#a160958fd4dd933f8b760bf61ec0f72c6"> 61</a></span> <span class="keywordtype">bool</span> Box::ReadWriteHeaderInternal(<a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">BoxBuffer</a>* buffer) {</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">if</span> (buffer-><a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html#ab644d8a65ae5acb37059a0fc50dc164a">Reading</a>()) {</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">// Skip for read mode, which is handled already in BoxReader.</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  CHECK(buffer->ReadWriteUInt32(&box_size_));</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  FourCC fourcc = BoxType();</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  CHECK(buffer->ReadWriteFourCC(&fourcc));</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>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> }</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> FullBox::FullBox() = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> FullBox::~FullBox() = <span class="keywordflow">default</span>;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
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<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="../../dd/dc1/structshaka_1_1media_1_1mp4_1_1FullBox.html#a21cc4d085f650dc18a20a4dd05cb6750"> 75</a></span> uint32_t FullBox::HeaderSize()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// Additional 1-byte version and 3-byte flags.</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">return</span> Box::HeaderSize() + 1 + 3;</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div>
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<div class="line"><a name="l00080"></a><span class="lineno"><a class="line" href="../../dd/dc1/structshaka_1_1media_1_1mp4_1_1FullBox.html#ad72e5a2d0def5bbba75b440d060ef1cf"> 80</a></span> <span class="keywordtype">bool</span> FullBox::ReadWriteHeaderInternal(<a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">BoxBuffer</a>* buffer) {</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  RCHECK(Box::ReadWriteHeaderInternal(buffer));</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  uint32_t vflags;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span> (buffer-><a class="code" href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html#ab644d8a65ae5acb37059a0fc50dc164a">Reading</a>()) {</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  RCHECK(buffer->ReadWriteUInt32(&vflags));</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  this->version = vflags >> 24;</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  this->flags = vflags & 0x00FFFFFF;</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  vflags = (this->version << 24) | this->flags;</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  RCHECK(buffer->ReadWriteUInt32(&vflags));</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</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 mp4</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> } <span class="comment">// namespace shaka</span></div>
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</div><!-- fragment --></div><!-- contents -->
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<div class="ttc" id="aclassshaka_1_1media_1_1mp4_1_1BoxBuffer_html"><div class="ttname"><a href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html">shaka::media::mp4::BoxBuffer</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dc/dbf/box__buffer_8h_source.html#l00025">box_buffer.h:25</a></div></div>
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<div class="ttc" id="aclassshaka_1_1media_1_1BufferWriter_html"><div class="ttname"><a href="../../dc/d41/classshaka_1_1media_1_1BufferWriter.html">shaka::media::BufferWriter</a></div><div class="ttdef"><b>Definition:</b> <a href="../../dd/dd2/buffer__writer_8h_source.html#l00023">buffer_writer.h:23</a></div></div>
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<div class="ttc" id="anamespaceshaka_html"><div class="ttname"><a href="../../d8/daf/namespaceshaka.html">shaka</a></div><div class="ttdoc">All the methods that are virtual are virtual for mocking.</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d15/gflags__hex__bytes_8cc_source.html#l00011">gflags_hex_bytes.cc:11</a></div></div>
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<div class="ttc" id="aclassshaka_1_1media_1_1mp4_1_1BoxReader_html"><div class="ttname"><a href="../../d1/dee/classshaka_1_1media_1_1mp4_1_1BoxReader.html">shaka::media::mp4::BoxReader</a></div><div class="ttdoc">Class for reading MP4 boxes.</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d92/box__reader_8h_source.html#l00025">box_reader.h:25</a></div></div>
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<div class="ttc" id="aclassshaka_1_1media_1_1mp4_1_1BoxBuffer_html_ab644d8a65ae5acb37059a0fc50dc164a"><div class="ttname"><a href="../../d1/da1/classshaka_1_1media_1_1mp4_1_1BoxBuffer.html#ab644d8a65ae5acb37059a0fc50dc164a">shaka::media::mp4::BoxBuffer::Reading</a></div><div class="ttdeci">bool Reading() const</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/dbf/box__buffer_8h_source.html#l00040">box_buffer.h:40</a></div></div>
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