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c4a205c7fa
Bug: None Change-Id: I5388bc018d7ddd285d154436b5fc52a15469a97d Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319220 Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Per Kjellander <perkj@webrtc.org> Commit-Queue: Björn Terelius <terelius@webrtc.org> Cr-Commit-Position: refs/heads/main@{#40710}
63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_CONGESTION_CONTROLLER_GOOG_CC_BITRATE_ESTIMATOR_H_
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#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_BITRATE_ESTIMATOR_H_
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#include <stdint.h>
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#include "absl/types/optional.h"
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#include "api/field_trials_view.h"
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#include "api/units/data_rate.h"
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#include "api/units/data_size.h"
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#include "api/units/timestamp.h"
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#include "rtc_base/experiments/field_trial_parser.h"
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namespace webrtc {
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// Computes a bayesian estimate of the throughput given acks containing
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// the arrival time and payload size. Samples which are far from the current
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// estimate or are based on few packets are given a smaller weight, as they
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// are considered to be more likely to have been caused by, e.g., delay spikes
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// unrelated to congestion.
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class BitrateEstimator {
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public:
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explicit BitrateEstimator(const FieldTrialsView* key_value_config);
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virtual ~BitrateEstimator();
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virtual void Update(Timestamp at_time, DataSize amount, bool in_alr);
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virtual absl::optional<DataRate> bitrate() const;
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absl::optional<DataRate> PeekRate() const;
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virtual void ExpectFastRateChange();
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private:
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float UpdateWindow(int64_t now_ms,
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int bytes,
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int rate_window_ms,
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bool* is_small_sample);
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int sum_;
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FieldTrialConstrained<int> initial_window_ms_;
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FieldTrialConstrained<int> noninitial_window_ms_;
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FieldTrialParameter<double> uncertainty_scale_;
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FieldTrialParameter<double> uncertainty_scale_in_alr_;
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FieldTrialParameter<double> small_sample_uncertainty_scale_;
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FieldTrialParameter<DataSize> small_sample_threshold_;
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FieldTrialParameter<DataRate> uncertainty_symmetry_cap_;
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FieldTrialParameter<DataRate> estimate_floor_;
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int64_t current_window_ms_;
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int64_t prev_time_ms_;
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float bitrate_estimate_kbps_;
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float bitrate_estimate_var_;
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_BITRATE_ESTIMATOR_H_
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