mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-16 15:20:42 +01:00
dc7d2c6fd7
In DelayBasedBwe, in experiment WebRTC-Bwe-AlrLimitedBackoff, back off relative the BWE only after the first detected overuse. The first time overuse is detected, back down to the acked bitrate. The idea is to faster drop BWE in the beginning of the call when the initial BWE guess may be too high. Withouth this, it may take a too long time to initially back down. BUG=webrtc:10542 Change-Id: I2a11457d2391ad25658e7c13d9cae02a38973ecb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/152541 Reviewed-by: Sebastian Jansson <srte@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29163}
105 lines
3.7 KiB
C++
105 lines
3.7 KiB
C++
/*
|
|
* 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 "api/network_state_predictor.h"
|
|
#include "api/transport/network_types.h"
|
|
#include "api/transport/webrtc_key_value_config.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 "rtc_base/constructor_magic.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;
|
|
bool backoff_in_alr;
|
|
};
|
|
|
|
explicit DelayBasedBwe(const WebRtcKeyValueConfig* key_value_config,
|
|
RtcEventLog* event_log,
|
|
NetworkStatePredictor* network_state_predictor);
|
|
virtual ~DelayBasedBwe();
|
|
|
|
Result IncomingPacketFeedbackVector(
|
|
const TransportPacketsFeedback& msg,
|
|
absl::optional<DataRate> acked_bitrate,
|
|
absl::optional<DataRate> probe_bitrate,
|
|
absl::optional<NetworkStateEstimate> network_estimate,
|
|
bool in_alr);
|
|
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;
|
|
void SetAlrLimitedBackoffExperiment(bool enabled);
|
|
|
|
DataRate TriggerOveruse(Timestamp at_time,
|
|
absl::optional<DataRate> link_capacity);
|
|
|
|
private:
|
|
friend class GoogCcStatePrinter;
|
|
void IncomingPacketFeedback(const PacketResult& packet_feedback,
|
|
Timestamp at_time);
|
|
Result MaybeUpdateEstimate(
|
|
absl::optional<DataRate> acked_bitrate,
|
|
absl::optional<DataRate> probe_bitrate,
|
|
absl::optional<NetworkStateEstimate> state_estimate,
|
|
bool recovered_from_overuse,
|
|
bool in_alr,
|
|
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_;
|
|
const WebRtcKeyValueConfig* const key_value_config_;
|
|
NetworkStatePredictor* network_state_predictor_;
|
|
std::unique_ptr<InterArrival> inter_arrival_;
|
|
std::unique_ptr<DelayIncreaseDetectorInterface> delay_detector_;
|
|
Timestamp last_seen_packet_;
|
|
bool uma_recorded_;
|
|
AimdRateControl rate_control_;
|
|
DataRate prev_bitrate_;
|
|
bool has_once_detected_overuse_;
|
|
BandwidthUsage prev_state_;
|
|
bool alr_limited_backoff_enabled_;
|
|
|
|
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
|
|
};
|
|
|
|
} // namespace webrtc
|
|
|
|
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_DELAY_BASED_BWE_H_
|