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< title > Shaka Packager SDK: packager/mpd/base/bandwidth_estimator.cc Source File< / title >
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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_b885194e7131202a9b4650a8967e838c.html" > mpd< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_6fe4b0529cd3ec97045d3314254a0cce.html" > base< / a > < / li > < / ul >
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< div class = "header" >
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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 < algorithm> < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include < cmath> < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include < numeric> < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > < a class = "code" href = "../../d8/daf/namespaceshaka.html" > shaka< / a > {< / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   BandwidthEstimator::BandwidthEstimator() = < span class = "keywordflow" > default< / span > ;< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   BandwidthEstimator::~BandwidthEstimator() = < span class = "keywordflow" > default< / span > ;< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > < a class = "line" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a53c67d33f000489d1ebb31a2bdd766a4" > 21< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a53c67d33f000489d1ebb31a2bdd766a4" > BandwidthEstimator::AddBlock< / a > (uint64_t size_in_bytes, < span class = "keywordtype" > double< / span > duration) {< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keywordflow" > if< / span > (size_in_bytes == 0 || duration == 0) {< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   LOG(WARNING) < < < span class = "stringliteral" > " Ignore block with size=" < / span > < < size_in_bytes< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < < < span class = "stringliteral" > " , duration=" < / span > < < duration;< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   }< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kBitsInByte = 8;< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "keyword" > const< / span > uint64_t size_in_bits = size_in_bytes * kBitsInByte;< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   total_size_in_bits_ += size_in_bits;< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   total_duration_ += duration;< / 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" > size_t< / span > kTargetDurationThreshold = 10;< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > if< / span > (initial_blocks_.size() < kTargetDurationThreshold) {< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   initial_blocks_.push_back({size_in_bits, duration});< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordflow" > return< / span > ;< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   }< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "keywordflow" > if< / span > (target_block_duration_ == 0) {< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "comment" > // Use the average duration as the target block duration. It will be used< / span > < / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "comment" > // to filter small blocks from bandwidth calculation.< / span > < / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   target_block_duration_ = GetAverageBlockDuration();< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "keywordflow" > for< / span > (< span class = "keyword" > const< / span > Block& block : initial_blocks_) {< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   max_bitrate_ =< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   std::max(max_bitrate_, GetBitrate(block, target_block_duration_));< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   }< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < span class = "keywordflow" > return< / 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 >   max_bitrate_ = std::max(max_bitrate_, GetBitrate({size_in_bits, duration},< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   target_block_duration_));< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   }< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > < a class = "line" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a9414560e16c46e7e2da3683a4dfb86cc" > 53< / a > < / span >   uint64_t < a class = "code" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a9414560e16c46e7e2da3683a4dfb86cc" > BandwidthEstimator::Estimate< / a > ()< span class = "keyword" > const < / span > {< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "keywordflow" > if< / span > (total_duration_ == 0)< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "keywordflow" > return< / span > 0;< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > static_cast< < / span > uint64_t< span class = "keyword" > > < / span > (ceil(total_size_in_bits_ / total_duration_));< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   }< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > < a class = "line" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a0df6c40f43a89d3d481392ac0298e37c" > 59< / a > < / span >   uint64_t < a class = "code" href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a0df6c40f43a89d3d481392ac0298e37c" > BandwidthEstimator::Max< / a > ()< span class = "keyword" > const < / span > {< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordflow" > if< / span > (max_bitrate_ != 0)< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > return< / span > max_bitrate_;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   < span class = "comment" > // We don' t have the |target_block_duration_| yet. Calculate a target< / span > < / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < span class = "comment" > // duration from the current available blocks.< / span > < / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   DCHECK(target_block_duration_ == 0);< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > target_block_duration = GetAverageBlockDuration();< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < span class = "comment" > // Calculate maximum bitrate with the target duration calculated above.< / span > < / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   uint64_t max_bitrate = 0;< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordflow" > for< / span > (< span class = "keyword" > const< / span > Block& block : initial_blocks_) {< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   max_bitrate =< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   std::max(max_bitrate, GetBitrate(block, target_block_duration));< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   }< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "keywordflow" > return< / span > max_bitrate;< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   }< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < span class = "keywordtype" > double< / span > BandwidthEstimator::GetAverageBlockDuration()< span class = "keyword" > const < / span > {< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < span class = "keywordflow" > if< / span > (initial_blocks_.empty())< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < span class = "keywordflow" > return< / span > 0.0;< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > sum =< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   std::accumulate(initial_blocks_.begin(), initial_blocks_.end(), 0.0,< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   [](< span class = "keywordtype" > double< / span > duration, < span class = "keyword" > const< / span > Block& block) {< / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   return duration + block.duration;< / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   });< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < span class = "keywordflow" > return< / span > sum / initial_blocks_.size();< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   }< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   uint64_t BandwidthEstimator::GetBitrate(< span class = "keyword" > const< / span > Block& block,< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   < span class = "keywordtype" > double< / span > target_block_duration)< span class = "keyword" > const < / span > {< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   < span class = "keywordflow" > if< / span > (block.duration < 0.5 * target_block_duration) {< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < span class = "comment" > // https://tools.ietf.org/html/rfc8216#section-4.1< / span > < / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < span class = "comment" > // The peak segment bit rate of a Media Playlist is the largest bit rate of< / span > < / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < span class = "comment" > // any continuous set of segments whose total duration is between 0.5< / span > < / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "comment" > // and 1.5 times the target duration.< / span > < / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   < span class = "comment" > // Only the short segments are excluded here as our media playlist generator< / span > < / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "comment" > // sets the target duration in the playlist to the largest segment duration.< / span > < / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < span class = "comment" > // So although the segment duration could be 1.5 times the user provided< / span > < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > // segment duration, it will never be larger than the actual target< / span > < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "comment" > // duration.< / span > < / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "comment" > // We also apply the same exclusion to the bandwidth computation for DASH as< / span > < / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   < span class = "comment" > // the bitrate for the short segment is not a good signal for peak< / span > < / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < span class = "comment" > // bandwidth.< / span > < / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "comment" > // See https://github.com/google/shaka-packager/issues/498 for details.< / span > < / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   VLOG(1) < < < span class = "stringliteral" > " Exclude short segment (duration " < / span > < < block.duration< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < < < span class = "stringliteral" > " , target_duration " < / span > < < target_block_duration< / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   < < < span class = "stringliteral" > " ) in peak bandwidth computation." < / span > ;< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   < span class = "keywordflow" > return< / span > 0.0;< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   }< / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > static_cast< < / span > uint64_t< span class = "keyword" > > < / span > (ceil(block.size_in_bits / block.duration));< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   }< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   < / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / 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_1BandwidthEstimator_html_a0df6c40f43a89d3d481392ac0298e37c" > < div class = "ttname" > < a href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a0df6c40f43a89d3d481392ac0298e37c" > shaka::BandwidthEstimator::Max< / a > < / div > < div class = "ttdeci" > uint64_t Max() const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d6/d86/bandwidth__estimator_8cc_source.html#l00059" > bandwidth_estimator.cc:59< / a > < / div > < / div >
< 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_1BandwidthEstimator_html_a9414560e16c46e7e2da3683a4dfb86cc" > < div class = "ttname" > < a href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a9414560e16c46e7e2da3683a4dfb86cc" > shaka::BandwidthEstimator::Estimate< / a > < / div > < div class = "ttdeci" > uint64_t Estimate() const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d6/d86/bandwidth__estimator_8cc_source.html#l00053" > bandwidth_estimator.cc:53< / a > < / div > < / div >
< div class = "ttc" id = "aclassshaka_1_1BandwidthEstimator_html_a53c67d33f000489d1ebb31a2bdd766a4" > < div class = "ttname" > < a href = "../../da/d2c/classshaka_1_1BandwidthEstimator.html#a53c67d33f000489d1ebb31a2bdd766a4" > shaka::BandwidthEstimator::AddBlock< / a > < / div > < div class = "ttdeci" > void AddBlock(uint64_t size_in_bytes, double duration)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../d6/d86/bandwidth__estimator_8cc_source.html#l00021" > bandwidth_estimator.cc:21< / a > < / div > < / div >
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