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cad3e0e2fa
This is search and replace change: find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataSize::Bytes<\(.*\)>()/DataSize::Bytes(\1)/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataSize::bytes/DataSize::Bytes/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataRate::BitsPerSec<\(.*\)>()/DataRate::BitsPerSec(\1)/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataRate::BytesPerSec<\(.*\)>()/DataRate::BytesPerSec(\1)/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataRate::KilobitsPerSec<\(.*\)>()/DataRate::KilobitsPerSec(\1)/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataRate::bps/DataRate::BitsPerSec/g" find . -type f \( -name "*.h" -o -name "*.cc" \) | xargs sed -i -e "s/DataRate::kbps/DataRate::KilobitsPerSec/g" git cl format Bug: webrtc:9709 Change-Id: I65aaca69474ba038c1fe2dd8dc30d3f8e7b94c29 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168647 Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30545}
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
/*
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* Copyright 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "modules/congestion_controller/goog_cc/link_capacity_estimator.h"
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#include <algorithm>
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#include "rtc_base/numerics/safe_minmax.h"
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namespace webrtc {
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LinkCapacityEstimator::LinkCapacityEstimator() {}
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DataRate LinkCapacityEstimator::UpperBound() const {
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if (estimate_kbps_.has_value())
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return DataRate::KilobitsPerSec(estimate_kbps_.value() +
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3 * deviation_estimate_kbps());
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return DataRate::Infinity();
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}
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DataRate LinkCapacityEstimator::LowerBound() const {
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if (estimate_kbps_.has_value())
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return DataRate::KilobitsPerSec(
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std::max(0.0, estimate_kbps_.value() - 3 * deviation_estimate_kbps()));
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return DataRate::Zero();
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}
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void LinkCapacityEstimator::Reset() {
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estimate_kbps_.reset();
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}
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void LinkCapacityEstimator::OnOveruseDetected(DataRate acknowledged_rate) {
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Update(acknowledged_rate, 0.05);
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}
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void LinkCapacityEstimator::OnProbeRate(DataRate probe_rate) {
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Update(probe_rate, 0.5);
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}
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void LinkCapacityEstimator::Update(DataRate capacity_sample, double alpha) {
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double sample_kbps = capacity_sample.kbps();
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if (!estimate_kbps_.has_value()) {
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estimate_kbps_ = sample_kbps;
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} else {
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estimate_kbps_ = (1 - alpha) * estimate_kbps_.value() + alpha * sample_kbps;
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}
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// Estimate the variance of the link capacity estimate and normalize the
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// variance with the link capacity estimate.
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const double norm = std::max(estimate_kbps_.value(), 1.0);
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double error_kbps = estimate_kbps_.value() - sample_kbps;
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deviation_kbps_ =
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(1 - alpha) * deviation_kbps_ + alpha * error_kbps * error_kbps / norm;
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// 0.4 ~= 14 kbit/s at 500 kbit/s
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// 2.5f ~= 35 kbit/s at 500 kbit/s
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deviation_kbps_ = rtc::SafeClamp(deviation_kbps_, 0.4f, 2.5f);
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}
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bool LinkCapacityEstimator::has_estimate() const {
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return estimate_kbps_.has_value();
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}
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DataRate LinkCapacityEstimator::estimate() const {
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return DataRate::KilobitsPerSec(*estimate_kbps_);
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}
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double LinkCapacityEstimator::deviation_estimate_kbps() const {
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// Calculate the max bit rate std dev given the normalized
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// variance and the current throughput bitrate. The standard deviation will
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// only be used if estimate_kbps_ has a value.
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return sqrt(deviation_kbps_ * estimate_kbps_.value());
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}
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} // namespace webrtc
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