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acab559c7b
Bug: webrtc:10498 Change-Id: Ic97c16d28cbc1e30609f6c1daa3a61423d44641c Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/136924 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Jonas Olsson <jonasolsson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28012}
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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* Copyright 2019 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/overuse_predictor.h"
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#include <algorithm>
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namespace webrtc {
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namespace {
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constexpr int kMaxPendingPackets = 100;
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DataRate GetAvailableCapacity(const NetworkStateEstimate& est,
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double deviation) {
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double capacity_bps = est.link_capacity.bps();
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double min_capacity_bps = est.link_capacity_min.bps();
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double deviation_bps = est.link_capacity_std_dev.bps();
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return DataRate::bps(
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std::max(capacity_bps + deviation_bps * deviation, min_capacity_bps));
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}
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} // namespace
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OverusePredictorConfig::OverusePredictorConfig(const std::string& config) {
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ParseFieldTrial({&enabled, &capacity_dev_ratio_threshold, &capacity_deviation,
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&delay_threshold},
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config);
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}
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OverusePredictor::OverusePredictor(const WebRtcKeyValueConfig* config)
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: conf_(config->Lookup("WebRTC-Bwe-OverusePredictor")) {}
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bool OverusePredictor::Enabled() const {
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return conf_.enabled;
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}
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void OverusePredictor::OnSentPacket(SentPacket sent_packet) {
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pending_.push_back(SentPacketInfo{sent_packet.send_time, sent_packet.size});
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if (pending_.size() > kMaxPendingPackets)
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pending_.pop_front();
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}
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bool OverusePredictor::PredictOveruse(const NetworkStateEstimate& est) {
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while (!pending_.empty() && pending_.front().send_time < est.last_send_time) {
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pending_.pop_front();
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}
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double deviation_ratio = est.link_capacity_std_dev / est.link_capacity;
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if (deviation_ratio > conf_.capacity_dev_ratio_threshold)
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return false;
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TimeDelta buffer_delay = PredictDelay(est) - est.propagation_delay;
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return buffer_delay > conf_.delay_threshold;
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}
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TimeDelta OverusePredictor::PredictDelay(const NetworkStateEstimate& est) {
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auto safe_capacity = GetAvailableCapacity(est, conf_.capacity_deviation);
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Timestamp last_send_time = est.last_send_time;
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TimeDelta link_delay = est.pre_link_buffer_delay;
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for (const auto& packet : pending_) {
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auto delta = packet.send_time - last_send_time;
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last_send_time = packet.send_time;
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link_delay = std::max(link_delay - delta, est.propagation_delay);
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link_delay += packet.size / safe_capacity;
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}
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return link_delay;
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}
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} // namespace webrtc
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