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<div class="title">seek_head.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/formats/webm/seek_head.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/third_party/libwebm/src/mkvmuxerutil.hpp"</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "packager/third_party/libwebm/src/webmids.hpp"</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>edash_packager {</div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="keyword">namespace </span>media {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">namespace </span>{</div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">const</span> mkvmuxer::uint64 kElementIds[] = {mkvmuxer::kMkvCluster,</div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  mkvmuxer::kMkvCues, mkvmuxer::kMkvInfo,</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  mkvmuxer::kMkvTracks};</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kElementIdCount = arraysize(kElementIds);</div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> uint64_t MaxSeekEntrySize() {</div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="keyword">const</span> uint64_t max_entry_payload_size =</div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  EbmlElementSize(</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  mkvmuxer::kMkvSeekID,</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  static_cast<mkvmuxer::uint64>(std::numeric_limits<uint32_t>::max())) +</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  EbmlElementSize(mkvmuxer::kMkvSeekPosition,</div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  std::numeric_limits<mkvmuxer::uint64>::max());</div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keyword">const</span> uint64_t max_entry_size =</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  EbmlMasterElementSize(mkvmuxer::kMkvSeek, max_entry_payload_size) +</div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  max_entry_payload_size;</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">return</span> max_entry_size;</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> }</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> } <span class="comment">// namespace</span></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> SeekHead::SeekHead()</div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  : cluster_pos_(-1),</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  cues_pos_(-1),</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  info_pos_(-1),</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  tracks_pos_(-1),</div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  wrote_void_(false) {}</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> SeekHead::~SeekHead() {}</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"><a class="line" href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387"> 46</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387">SeekHead::Write</a>(mkvmuxer::IMkvWriter* writer) {</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  std::vector<uint64_t> element_sizes;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">const</span> uint64_t payload_size = GetPayloadSize(&element_sizes);</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">if</span> (payload_size == 0) {</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">const</span> int64_t start_pos = writer->Position();</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordflow">if</span> (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeekHead, payload_size))</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> int64_t positions[] = {cluster_pos_, cues_pos_, info_pos_, tracks_pos_};</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < kElementIdCount; ++i) {</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">if</span> (element_sizes[i] == 0)</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">continue</span>;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">const</span> mkvmuxer::uint64 position =</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">static_cast<</span>mkvmuxer::uint64<span class="keyword">></span>(positions[i]);</div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordflow">if</span> (!WriteEbmlMasterElement(writer, mkvmuxer::kMkvSeek, element_sizes[i]) ||</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  !WriteEbmlElement(writer, mkvmuxer::kMkvSeekID, kElementIds[i]) ||</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  !WriteEbmlElement(writer, mkvmuxer::kMkvSeekPosition, position))</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordflow">return</span> <span class="keyword">false</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> </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// If we wrote void before, then fill in the extra with void.</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (wrote_void_) {</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> uint64_t max_payload_size = kElementIdCount * MaxSeekEntrySize();</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">const</span> uint64_t total_void_size =</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  EbmlMasterElementSize(mkvmuxer::kMkvSeekHead, max_payload_size) +</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  max_payload_size;</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">const</span> uint64_t extra_void =</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  total_void_size - (writer->Position() - start_pos);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">if</span> (!WriteVoidElement(writer, extra_void))</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> </div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a"> 87</a></span> <span class="keywordtype">bool</span> <a class="code" href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a">SeekHead::WriteVoid</a>(mkvmuxer::IMkvWriter* writer) {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">const</span> uint64_t payload_size = kElementIdCount * MaxSeekEntrySize();</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">const</span> uint64_t total_size =</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  EbmlMasterElementSize(mkvmuxer::kMkvSeekHead, payload_size) +</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  payload_size;</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  wrote_void_ = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keyword">const</span> uint64_t written = WriteVoidElement(writer, total_size);</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (!written)</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> <span class="keyword">true</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> uint64_t SeekHead::GetPayloadSize(std::vector<uint64_t>* data) {</div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">const</span> int64_t positions[] = {cluster_pos_, cues_pos_, info_pos_, tracks_pos_};</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  uint64_t total_payload_size = 0;</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  data->resize(kElementIdCount);</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < kElementIdCount; ++i) {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">if</span> (positions[i] < 0) {</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  (*data)[i] = 0;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">continue</span>;</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> </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">const</span> mkvmuxer::uint64 position =</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">static_cast<</span>mkvmuxer::uint64<span class="keyword">></span>(positions[i]);</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  (*data)[i] = EbmlElementSize(mkvmuxer::kMkvSeekID, kElementIds[i]) +</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  EbmlElementSize(mkvmuxer::kMkvSeekPosition, position);</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  total_payload_size +=</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  data->at(i) + EbmlMasterElementSize(mkvmuxer::kMkvSeek, data->at(i));</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  }</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">return</span> total_payload_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> </div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> } <span class="comment">// namespace media</span></div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> } <span class="comment">// namespace edash_packager</span></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1SeekHead_html_a3f8fbcfde953b6316586493c3e314387"><div class="ttname"><a href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a3f8fbcfde953b6316586493c3e314387">edash_packager::media::SeekHead::Write</a></div><div class="ttdeci">bool Write(mkvmuxer::IMkvWriter *writer)</div><div class="ttdef"><b>Definition:</b> <a href="../../d3/dbc/seek__head_8cc_source.html#l00046">seek_head.cc:46</a></div></div>
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<div class="ttc" id="classedash__packager_1_1media_1_1SeekHead_html_a5afa61eb7ec1bf28d60f4e2a7d9a9b4a"><div class="ttname"><a href="../../df/df4/classedash__packager_1_1media_1_1SeekHead.html#a5afa61eb7ec1bf28d60f4e2a7d9a9b4a">edash_packager::media::SeekHead::WriteVoid</a></div><div class="ttdeci">bool WriteVoid(mkvmuxer::IMkvWriter *writer)</div><div class="ttdoc">Writes a void element large enough to fit the SeekHead. </div><div class="ttdef"><b>Definition:</b> <a href="../../d3/dbc/seek__head_8cc_source.html#l00087">seek_head.cc:87</a></div></div>
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