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<li class="navelem"><a class="el" href="../../dir_89dd766eb2df7d7257dbe806a34404af.html">mpd</a></li><li class="navelem"><a class="el" href="../../dir_2618cd273dea54f184e42d7a562af818.html">base</a></li> </ul>
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<div class="title">bandwidth_estimator.h</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">#ifndef MPD_BASE_BANDWIDTH_ESTIMATOR_H_</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor"></span><span class="preprocessor">#define MPD_BASE_BANDWIDTH_ESTIMATOR_H_</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#include <stddef.h></span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include <stdint.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="preprocessor">#include <list></span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div>
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<div class="line"><a name="l00015"></a><span class="lineno"><a class="line" href="../../d2/d6f/classBandwidthEstimator.html"> 15</a></span> <span class="keyword">class </span><a class="code" href="../../d2/d6f/classBandwidthEstimator.html">BandwidthEstimator</a> {</div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keyword">explicit</span> <a class="code" href="../../d2/d6f/classBandwidthEstimator.html#aaae9573785ee9d62e0927f806537ea97">BandwidthEstimator</a>(<span class="keywordtype">int</span> num_blocks);</div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  ~<a class="code" href="../../d2/d6f/classBandwidthEstimator.html">BandwidthEstimator</a>();</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>  <span class="comment">// @param size is the size of the block in bytes. Should be positive.</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  <span class="comment">// @param duration is the length in seconds. Should be positive.</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordtype">void</span> AddBlock(uint64_t size, <span class="keywordtype">double</span> duration);</div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="comment">// @return The estimate bandwidth, in bits per second, from the harmonic mean</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="comment">// of the number of blocks specified in the constructor. The value is</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  <span class="comment">// rounded up to the nearest integer.</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  uint64_t Estimate() <span class="keyword">const</span>;</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="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">int</span> kUseAllBlocks;</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="keyword">private</span>:</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> num_blocks_for_estimation_;</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordtype">double</span> harmonic_mean_denominator_;</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>  <span class="comment">// This is not used when num_blocks_for_estimation_ != 0. Therefore it should</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="comment">// always be 0 if num_blocks_for_estimation_ != 0.</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordtype">size_t</span> num_blocks_added_;</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  std::list<double> history_;</div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> };</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> <span class="preprocessor">#endif // MPD_BASE_BANDWIDTH_ESTIMATOR_H_</span></div>
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<div class="ttc" id="classBandwidthEstimator_html_aaae9573785ee9d62e0927f806537ea97"><div class="ttname"><a href="../../d2/d6f/classBandwidthEstimator.html#aaae9573785ee9d62e0927f806537ea97">BandwidthEstimator::BandwidthEstimator</a></div><div class="ttdeci">BandwidthEstimator(int num_blocks)</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d86/bandwidth__estimator_8cc_source.html#l00016">bandwidth_estimator.cc:16</a></div></div>
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<div class="ttc" id="classBandwidthEstimator_html"><div class="ttname"><a href="../../d2/d6f/classBandwidthEstimator.html">BandwidthEstimator</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d8/d19/bandwidth__estimator_8h_source.html#l00015">bandwidth_estimator.h:15</a></div></div>
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