b3564c1cb2
If we're in ALR, the acked rate is going to be significantly lower than the current estimate for the link capacity. If we need to back off in this situation (usually caused by latency spikes), this CL makes us back off relative to current estimate if. We then immediately send a new probe just in case the network did actually change. All of this is behind experiment flags for now. Bug: webrtc:10144 Change-Id: I062a259c36417eea2211d44592ef7fc979aa22b7 Reviewed-on: https://webrtc-review.googlesource.com/c/113880 Commit-Queue: Erik Språng <sprang@webrtc.org> Reviewed-by: Sebastian Jansson <srte@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26045}
96 lines
3.3 KiB
C++
96 lines
3.3 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 MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_
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#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <vector>
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#include "absl/types/optional.h"
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#include "modules/congestion_controller/goog_cc/delay_increase_detector_interface.h"
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#include "modules/congestion_controller/goog_cc/probe_bitrate_estimator.h"
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#include "modules/remote_bitrate_estimator/aimd_rate_control.h"
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#include "modules/remote_bitrate_estimator/include/bwe_defines.h"
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#include "modules/remote_bitrate_estimator/inter_arrival.h"
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#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" // For PacketFeedback
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#include "rtc_base/constructormagic.h"
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#include "rtc_base/race_checker.h"
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namespace webrtc {
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class RtcEventLog;
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class DelayBasedBwe {
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public:
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struct Result {
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Result();
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Result(bool probe, DataRate target_bitrate);
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~Result();
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bool updated;
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bool probe;
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DataRate target_bitrate = DataRate::Zero();
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bool recovered_from_overuse;
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bool backoff_in_alr;
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};
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explicit DelayBasedBwe(RtcEventLog* event_log);
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virtual ~DelayBasedBwe();
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Result IncomingPacketFeedbackVector(
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const std::vector<PacketFeedback>& packet_feedback_vector,
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absl::optional<DataRate> acked_bitrate,
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absl::optional<DataRate> probe_bitrate,
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bool in_alr,
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Timestamp at_time);
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void OnRttUpdate(TimeDelta avg_rtt);
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bool LatestEstimate(std::vector<uint32_t>* ssrcs, DataRate* bitrate) const;
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void SetStartBitrate(DataRate start_bitrate);
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void SetMinBitrate(DataRate min_bitrate);
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TimeDelta GetExpectedBwePeriod() const;
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void SetAlrLimitedBackoffExperiment(bool enabled);
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private:
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friend class GoogCcStatePrinter;
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void IncomingPacketFeedback(const PacketFeedback& packet_feedback,
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Timestamp at_time);
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Result MaybeUpdateEstimate(absl::optional<DataRate> acked_bitrate,
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absl::optional<DataRate> probe_bitrate,
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bool recovered_from_overuse,
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bool in_alr,
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Timestamp at_time);
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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(Timestamp now,
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absl::optional<DataRate> acked_bitrate,
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DataRate* target_bitrate);
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rtc::RaceChecker network_race_;
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RtcEventLog* const event_log_;
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std::unique_ptr<InterArrival> inter_arrival_;
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std::unique_ptr<DelayIncreaseDetectorInterface> delay_detector_;
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Timestamp last_seen_packet_;
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bool uma_recorded_;
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AimdRateControl rate_control_;
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size_t trendline_window_size_;
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double trendline_smoothing_coeff_;
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double trendline_threshold_gain_;
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DataRate prev_bitrate_;
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BandwidthUsage prev_state_;
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bool alr_limited_backoff_enabled_;
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RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_
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