blob: dbe759ebf5f10fc5e06094314e802bb852040201 [file] [log] [blame]
/*
* 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_DELAY_BASED_BWE_H_
#define MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_
#include <memory>
#include <utility>
#include <vector>
#include "modules/congestion_controller/delay_increase_detector_interface.h"
#include "modules/congestion_controller/probe_bitrate_estimator.h"
#include "modules/remote_bitrate_estimator/aimd_rate_control.h"
#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "modules/remote_bitrate_estimator/inter_arrival.h"
#include "rtc_base/checks.h"
#include "rtc_base/constructormagic.h"
#include "rtc_base/race_checker.h"
namespace webrtc {
class RtcEventLog;
class DelayBasedBwe {
public:
static const int64_t kStreamTimeOutMs = 2000;
struct Result {
Result();
Result(bool probe, uint32_t target_bitrate_bps);
~Result();
bool updated;
bool probe;
uint32_t target_bitrate_bps;
bool recovered_from_overuse;
};
DelayBasedBwe(RtcEventLog* event_log, const Clock* clock);
virtual ~DelayBasedBwe();
Result IncomingPacketFeedbackVector(
const std::vector<PacketFeedback>& packet_feedback_vector,
rtc::Optional<uint32_t> acked_bitrate_bps);
void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms);
bool LatestEstimate(std::vector<uint32_t>* ssrcs,
uint32_t* bitrate_bps) const;
void SetStartBitrate(int start_bitrate_bps);
void SetMinBitrate(int min_bitrate_bps);
int64_t GetExpectedBwePeriodMs() const;
private:
void IncomingPacketFeedback(const PacketFeedback& packet_feedback);
Result OnLongFeedbackDelay(int64_t arrival_time_ms);
Result MaybeUpdateEstimate(rtc::Optional<uint32_t> acked_bitrate_bps,
bool request_probe);
// Updates the current remote rate estimate and returns true if a valid
// estimate exists.
bool UpdateEstimate(int64_t now_ms,
rtc::Optional<uint32_t> acked_bitrate_bps,
uint32_t* target_bitrate_bps);
rtc::RaceChecker network_race_;
RtcEventLog* const event_log_;
const Clock* const clock_;
std::unique_ptr<InterArrival> inter_arrival_;
std::unique_ptr<DelayIncreaseDetectorInterface> delay_detector_;
int64_t last_seen_packet_ms_;
bool uma_recorded_;
AimdRateControl rate_control_;
ProbeBitrateEstimator probe_bitrate_estimator_;
size_t trendline_window_size_;
double trendline_smoothing_coeff_;
double trendline_threshold_gain_;
int consecutive_delayed_feedbacks_;
uint32_t prev_bitrate_;
BandwidthUsage prev_state_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_