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/*
* Copyright (c) 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_LOSS_BASED_BANDWIDTH_ESTIMATION_H_
#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_LOSS_BASED_BANDWIDTH_ESTIMATION_H_
#include <vector>
#include "api/field_trials_view.h"
#include "api/transport/network_types.h"
#include "api/units/data_rate.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/experiments/field_trial_parser.h"
namespace webrtc {
struct LossBasedControlConfig {
explicit LossBasedControlConfig(const FieldTrialsView* key_value_config);
LossBasedControlConfig(const LossBasedControlConfig&);
LossBasedControlConfig& operator=(const LossBasedControlConfig&) = default;
~LossBasedControlConfig();
bool enabled;
FieldTrialParameter<double> min_increase_factor;
FieldTrialParameter<double> max_increase_factor;
FieldTrialParameter<TimeDelta> increase_low_rtt;
FieldTrialParameter<TimeDelta> increase_high_rtt;
FieldTrialParameter<double> decrease_factor;
FieldTrialParameter<TimeDelta> loss_window;
FieldTrialParameter<TimeDelta> loss_max_window;
FieldTrialParameter<TimeDelta> acknowledged_rate_max_window;
FieldTrialParameter<DataRate> increase_offset;
FieldTrialParameter<DataRate> loss_bandwidth_balance_increase;
FieldTrialParameter<DataRate> loss_bandwidth_balance_decrease;
FieldTrialParameter<DataRate> loss_bandwidth_balance_reset;
FieldTrialParameter<double> loss_bandwidth_balance_exponent;
FieldTrialParameter<bool> allow_resets;
FieldTrialParameter<TimeDelta> decrease_interval;
FieldTrialParameter<TimeDelta> loss_report_timeout;
};
// Estimates an upper BWE limit based on loss.
// It requires knowledge about lost packets and acknowledged bitrate.
// Ie, this class require transport feedback.
class LossBasedBandwidthEstimation {
public:
explicit LossBasedBandwidthEstimation(
const FieldTrialsView* key_value_config);
// Returns the new estimate.
DataRate Update(Timestamp at_time,
DataRate min_bitrate,
DataRate wanted_bitrate,
TimeDelta last_round_trip_time);
void UpdateAcknowledgedBitrate(DataRate acknowledged_bitrate,
Timestamp at_time);
void Initialize(DataRate bitrate);
bool Enabled() const { return config_.enabled; }
// Returns true if LossBasedBandwidthEstimation is enabled and have
// received loss statistics. Ie, this class require transport feedback.
bool InUse() const {
return Enabled() && last_loss_packet_report_.IsFinite();
}
void UpdateLossStatistics(const std::vector<PacketResult>& packet_results,
Timestamp at_time);
DataRate GetEstimate() const { return loss_based_bitrate_; }
private:
friend class GoogCcStatePrinter;
void Reset(DataRate bitrate);
double loss_increase_threshold() const;
double loss_decrease_threshold() const;
double loss_reset_threshold() const;
DataRate decreased_bitrate() const;
const LossBasedControlConfig config_;
double average_loss_;
double average_loss_max_;
DataRate loss_based_bitrate_;
DataRate acknowledged_bitrate_max_;
Timestamp acknowledged_bitrate_last_update_;
Timestamp time_last_decrease_;
bool has_decreased_since_last_loss_report_;
Timestamp last_loss_packet_report_;
double last_loss_ratio_;
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_LOSS_BASED_BANDWIDTH_ESTIMATION_H_
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