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/*
* Copyright (c) 2016 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_BWE_H_
#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include "absl/types/optional.h"
#include "modules/congestion_controller/goog_cc/delay_increase_detector_interface.h"
#include "modules/congestion_controller/goog_cc/probe_bitrate_estimator.h"
#include "modules/remote_bitrate_estimator/aimd_rate_control.h"
#include "modules/remote_bitrate_estimator/include/bwe_defines.h"
#include "modules/remote_bitrate_estimator/inter_arrival.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h" // For PacketFeedback
#include "rtc_base/constructormagic.h"
#include "rtc_base/race_checker.h"
namespace webrtc {
class RtcEventLog;
class DelayBasedBwe {
public:
struct Result {
Result();
Result(bool probe, DataRate target_bitrate);
~Result();
bool updated;
bool probe;
DataRate target_bitrate = DataRate::Zero();
bool recovered_from_overuse;
};
explicit DelayBasedBwe(RtcEventLog* event_log);
virtual ~DelayBasedBwe();
Result IncomingPacketFeedbackVector(
const std::vector<PacketFeedback>& packet_feedback_vector,
absl::optional<DataRate> acked_bitrate,
absl::optional<DataRate> probe_bitrate,
Timestamp at_time);
Result OnDelayedFeedback(Timestamp receive_time);
void OnRttUpdate(TimeDelta avg_rtt);
bool LatestEstimate(std::vector<uint32_t>* ssrcs, DataRate* bitrate) const;
void SetStartBitrate(DataRate start_bitrate);
void SetMinBitrate(DataRate min_bitrate);
TimeDelta GetExpectedBwePeriod() const;
private:
friend class GoogCcStatePrinter;
void IncomingPacketFeedback(const PacketFeedback& packet_feedback,
Timestamp at_time);
Result OnLongFeedbackDelay(Timestamp arrival_time);
Result MaybeUpdateEstimate(absl::optional<DataRate> acked_bitrate,
absl::optional<DataRate> probe_bitrate,
bool request_probe,
Timestamp at_time);
// Updates the current remote rate estimate and returns true if a valid
// estimate exists.
bool UpdateEstimate(Timestamp now,
absl::optional<DataRate> acked_bitrate,
DataRate* target_bitrate);
rtc::RaceChecker network_race_;
RtcEventLog* const event_log_;
std::unique_ptr<InterArrival> inter_arrival_;
std::unique_ptr<DelayIncreaseDetectorInterface> delay_detector_;
Timestamp last_seen_packet_;
bool uma_recorded_;
AimdRateControl rate_control_;
size_t trendline_window_size_;
double trendline_smoothing_coeff_;
double trendline_threshold_gain_;
int consecutive_delayed_feedbacks_;
DataRate prev_bitrate_;
BandwidthUsage prev_state_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_