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70 lines
2.3 KiB
C++
70 lines
2.3 KiB
C++
/*
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* Copyright (c) 2016 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_ALR_DETECTOR_H_
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#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_ALR_DETECTOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include <optional>
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#include "interval_budget.h"
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namespace webrtc {
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class RtcEventLog;
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struct AlrDetectorConfig {
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// Sent traffic ratio as a function of network capacity used to determine
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// application-limited region. ALR region start when bandwidth usage drops
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// below kAlrStartUsageRatio and ends when it raises above
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// kAlrEndUsageRatio. NOTE: This is intentionally conservative at the moment
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// until BW adjustments of application limited region is fine tuned.
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double bandwidth_usage_ratio = 0.65;
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double start_budget_level_ratio = 0.80;
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double stop_budget_level_ratio = 0.50;
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};
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// Application limited region detector is a class that utilizes signals of
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// elapsed time and bytes sent to estimate whether network traffic is
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// currently limited by the application's ability to generate traffic.
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//
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// AlrDetector provides a signal that can be utilized to adjust
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// estimate bandwidth.
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// Note: This class is not thread-safe.
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class AlrDetector {
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public:
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AlrDetector(AlrDetectorConfig config);
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AlrDetector();
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~AlrDetector();
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void OnBytesSent(size_t bytes_sent, int64_t send_time_ms);
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// Set current estimated bandwidth.
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void SetEstimatedBitrate(int bitrate_bps);
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// Returns time in milliseconds when the current application-limited region
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// started or empty result if the sender is currently not application-limited.
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std::optional<int64_t> GetApplicationLimitedRegionStartTime() const;
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private:
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friend class GoogCcStatePrinter;
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const AlrDetectorConfig conf_;
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std::optional<int64_t> last_send_time_ms_;
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IntervalBudget alr_budget_;
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std::optional<int64_t> alr_started_time_ms_;
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_ALR_DETECTOR_H_
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