mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-15 14:50:39 +01:00
da0222b3fc
The new controller behaves mostly like before, but increases the target rate on timer update rather than when feedback is received. This makes the behavior easier to predict. It also uses a duration parameter to track the increase, removing the meed for the minimum rate increase constants that exists in the previous solution. Bug: webrtc:9718 Change-Id: Iae31a9ba2d6474a8236f8eb72f86ff434f1d1fc6 Reviewed-on: https://webrtc-review.googlesource.com/c/114681 Commit-Queue: Sebastian Jansson <srte@webrtc.org> Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org> Cr-Commit-Position: refs/heads/master@{#26088}
97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
/*
|
|
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
#ifndef MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_RATE_CONTROLLER_H_
|
|
#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_RATE_CONTROLLER_H_
|
|
|
|
#include <memory>
|
|
|
|
#include "absl/types/optional.h"
|
|
#include "api/transport/network_types.h"
|
|
#include "logging/rtc_event_log/rtc_event_log.h"
|
|
#include "modules/congestion_controller/goog_cc/link_capacity_estimator.h"
|
|
#include "modules/congestion_controller/goog_cc/packet_grouping.h"
|
|
#include "modules/congestion_controller/goog_cc/trendline_estimator.h"
|
|
#include "rtc_base/experiments/field_trial_parser.h"
|
|
#include "rtc_base/experiments/field_trial_units.h"
|
|
|
|
namespace webrtc {
|
|
struct DelayBasedRateControllerConfig {
|
|
FieldTrialFlag enabled;
|
|
FieldTrialParameter<double> no_ack_backoff_fraction;
|
|
FieldTrialParameter<TimeDelta> no_ack_backoff_interval;
|
|
FieldTrialParameter<double> ack_backoff_fraction;
|
|
FieldTrialParameter<double> probe_backoff_fraction;
|
|
FieldTrialParameter<double> initial_increase_rate;
|
|
FieldTrialParameter<double> increase_rate;
|
|
FieldTrialParameter<DataRate> first_period_increase_rate;
|
|
FieldTrialParameter<TimeDelta> stop_increase_after;
|
|
FieldTrialParameter<TimeDelta> min_increase_interval;
|
|
FieldTrialParameter<DataRate> linear_increase_threshold;
|
|
FieldTrialParameter<TimeDelta> reference_duration_offset;
|
|
DelayBasedRateControllerConfig();
|
|
~DelayBasedRateControllerConfig();
|
|
};
|
|
|
|
// Rate controller for GoogCC, increases the target rate based on a
|
|
// fixed increase interval and an RTT dependent increase rate.
|
|
class DelayBasedRateController {
|
|
public:
|
|
DelayBasedRateController(RtcEventLog* event_log,
|
|
TargetRateConstraints constraints);
|
|
~DelayBasedRateController();
|
|
void OnRouteChange();
|
|
void UpdateConstraints(TargetRateConstraints constraints);
|
|
void SetAcknowledgedRate(DataRate acknowledged_rate);
|
|
void OnTransportPacketsFeedback(TransportPacketsFeedback msg,
|
|
absl::optional<DataRate> probe_bitrate);
|
|
void OnTimeUpdate(Timestamp at_time);
|
|
void OnRemoteBitrateControl(RemoteBitrateReport msg);
|
|
TimeDelta GetExpectedBandwidthPeriod() const;
|
|
|
|
bool Enabled() const { return conf_.enabled; }
|
|
DataRate target_rate() const;
|
|
bool in_underuse() const;
|
|
|
|
private:
|
|
enum class ControllerSate { kHold, kExponentialIncrease, kLinearIncrease };
|
|
friend class GoogCcStatePrinter;
|
|
void OnFeedbackUpdate(BandwidthUsage usage,
|
|
absl::optional<DataRate> probe_bitrate,
|
|
Timestamp at_time);
|
|
void MaybeLog();
|
|
const DelayBasedRateControllerConfig conf_;
|
|
RtcEventLog* event_log_;
|
|
|
|
PacketDelayGrouper packet_grouper_;
|
|
std::unique_ptr<TrendlineEstimator> overuse_detector_;
|
|
LinkCapacityEstimator link_capacity_;
|
|
|
|
DataRate min_rate_ = DataRate::Zero();
|
|
DataRate max_rate_ = DataRate::Infinity();
|
|
|
|
absl::optional<DataRate> acknowledged_rate_;
|
|
TimeDelta last_rtt_ = TimeDelta::seconds(1);
|
|
Timestamp first_unacked_send_ = Timestamp::PlusInfinity();
|
|
Timestamp last_feedback_update_ = Timestamp::MinusInfinity();
|
|
|
|
DataRate target_rate_;
|
|
|
|
Timestamp last_no_ack_backoff_ = Timestamp::MinusInfinity();
|
|
bool increasing_state_ = false;
|
|
double accumulated_duration_ = 0;
|
|
Timestamp last_increase_update_ = Timestamp::PlusInfinity();
|
|
DataRate increase_reference_ = DataRate::PlusInfinity();
|
|
|
|
absl::optional<BandwidthUsage> logged_state_;
|
|
DataRate logged_target_ = DataRate::PlusInfinity();
|
|
};
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_RATE_CONTROLLER_H_
|