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