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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.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 >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > //< / span > < / div >
< 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 >
< 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 >
< 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 >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include " packager/mpd/base/bandwidth_estimator.h" < / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include < cmath> < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include < cstdlib> < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > BandwidthEstimator::kUseAllBlocks = 0;< / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > < a class = "line" href = "../../d2/d6f/classBandwidthEstimator.html#aaae9573785ee9d62e0927f806537ea97" > 16< / a > < / span >   < a class = "code" href = "../../d2/d6f/classBandwidthEstimator.html#aaae9573785ee9d62e0927f806537ea97" > BandwidthEstimator::BandwidthEstimator< / a > (< span class = "keywordtype" > int< / span > num_blocks)< / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   : num_blocks_for_estimation_(num_blocks),< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   harmonic_mean_denominator_(0.0),< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   num_blocks_added_(0) {}< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   BandwidthEstimator::~BandwidthEstimator() {}< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keywordtype" > void< / span > BandwidthEstimator::AddBlock(uint64_t size, < span class = "keywordtype" > double< / span > duration) {< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   DCHECK_GT(duration, 0.0);< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   DCHECK_GT(size, 0u);< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "keywordflow" > if< / span > (num_blocks_for_estimation_ < 0 & & < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   static_cast< int> (history_.size()) > = -1 * num_blocks_for_estimation_) {< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "comment" > // Short circuiting the case where |num_blocks_for_estimation_| number of< / span > < / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "comment" > // blocks have been added already.< / span > < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   }< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kBitsInByte = 8;< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > bits_per_second_reciprocal = duration / (kBitsInByte * size);< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   harmonic_mean_denominator_ += bits_per_second_reciprocal;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordflow" > if< / span > (num_blocks_for_estimation_ == kUseAllBlocks) {< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   DCHECK_EQ(history_.size(), 0u);< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   ++num_blocks_added_;< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   }< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   history_.push_back(bits_per_second_reciprocal);< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "keywordflow" > if< / span > (num_blocks_for_estimation_ > 0 & & < / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   static_cast< int> (history_.size()) > num_blocks_for_estimation_) {< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   harmonic_mean_denominator_ -= history_.front();< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   history_.pop_front();< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   }< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   DCHECK_NE(num_blocks_for_estimation_, kUseAllBlocks);< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   DCHECK_LE(static_cast< int> (history_.size()), abs(num_blocks_for_estimation_));< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   DCHECK_EQ(num_blocks_added_, 0u);< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   uint64_t BandwidthEstimator::Estimate()< span class = "keyword" > const < / span > {< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keywordflow" > if< / span > (harmonic_mean_denominator_ == 0.0)< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keyword" > const< / span > uint64_t num_blocks = num_blocks_for_estimation_ == kUseAllBlocks< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   ? num_blocks_added_< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   : history_.size();< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > static_cast< < / span > uint64_t< span class = "keyword" > > < / span > (ceil(num_blocks / harmonic_mean_denominator_));< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   }< / div >
< 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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