492ee28b73
This helps a lot to avoid reducing the bitrate too quickly when there's a short period of very few packets delivered, followed by the rate resuming at the regular rate. It specifically avoids the BWE going down to super low values as a response delay spikes. BUG=webrtc:6566 R=terelius@webrtc.org Review URL: https://codereview.webrtc.org/2422063002 . Cr-Commit-Position: refs/heads/master@{#14802}
103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*
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* Copyright (c) 2016 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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#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_
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#define WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_
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#include <memory>
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#include <utility>
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#include <vector>
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#include "webrtc/base/checks.h"
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/base/rate_statistics.h"
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#include "webrtc/base/thread_checker.h"
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#include "webrtc/modules/congestion_controller/probe_bitrate_estimator.h"
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#include "webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h"
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#include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
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#include "webrtc/modules/remote_bitrate_estimator/inter_arrival.h"
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#include "webrtc/modules/remote_bitrate_estimator/overuse_detector.h"
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#include "webrtc/modules/remote_bitrate_estimator/overuse_estimator.h"
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namespace webrtc {
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class DelayBasedBwe {
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public:
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static const int64_t kStreamTimeOutMs = 2000;
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struct Result {
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Result() : updated(false), probe(false), target_bitrate_bps(0) {}
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Result(bool probe, uint32_t target_bitrate_bps)
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: updated(true), probe(probe), target_bitrate_bps(target_bitrate_bps) {}
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bool updated;
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bool probe;
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uint32_t target_bitrate_bps;
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};
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explicit DelayBasedBwe(Clock* clock);
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virtual ~DelayBasedBwe() {}
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Result IncomingPacketFeedbackVector(
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const std::vector<PacketInfo>& packet_feedback_vector);
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void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms);
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bool LatestEstimate(std::vector<uint32_t>* ssrcs,
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uint32_t* bitrate_bps) const;
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void SetMinBitrate(int min_bitrate_bps);
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private:
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// Computes a bayesian estimate of the throughput given acks containing
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// the arrival time and payload size. Samples which are far from the current
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// estimate or are based on few packets are given a smaller weight, as they
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// are considered to be more likely to have been caused by, e.g., delay spikes
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// unrelated to congestion.
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class BitrateEstimator {
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public:
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BitrateEstimator();
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void Update(int64_t now_ms, int bytes);
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rtc::Optional<uint32_t> bitrate_bps() const;
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private:
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float UpdateWindow(int64_t now_ms, int bytes, int rate_window_ms);
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int sum_;
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int64_t current_win_ms_;
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int64_t prev_time_ms_;
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float bitrate_estimate_;
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float bitrate_estimate_var_;
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RateStatistics old_estimator_;
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const bool in_experiment_;
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};
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Result IncomingPacketInfo(const PacketInfo& info);
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// Updates the current remote rate estimate and returns true if a valid
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// estimate exists.
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bool UpdateEstimate(int64_t packet_arrival_time_ms,
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int64_t now_ms,
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rtc::Optional<uint32_t> acked_bitrate_bps,
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uint32_t* target_bitrate_bps);
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rtc::ThreadChecker network_thread_;
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Clock* const clock_;
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std::unique_ptr<InterArrival> inter_arrival_;
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std::unique_ptr<OveruseEstimator> estimator_;
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OveruseDetector detector_;
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BitrateEstimator receiver_incoming_bitrate_;
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int64_t last_update_ms_;
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int64_t last_seen_packet_ms_;
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bool uma_recorded_;
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AimdRateControl rate_control_;
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ProbeBitrateEstimator probe_bitrate_estimator_;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_
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