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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_PROBE_BITRATE_ESTIMATOR_H_
#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_PROBE_BITRATE_ESTIMATOR_H_
#include <map>
#include "absl/types/optional.h"
#include "api/transport/network_types.h"
#include "api/units/data_rate.h"
#include "api/units/data_size.h"
#include "api/units/timestamp.h"
namespace webrtc {
class RtcEventLog;
class ProbeBitrateEstimator {
public:
explicit ProbeBitrateEstimator(RtcEventLog* event_log);
~ProbeBitrateEstimator();
// Should be called for every probe packet we receive feedback about.
// Returns the estimated bitrate if the probe completes a valid cluster.
absl::optional<DataRate> HandleProbeAndEstimateBitrate(
const PacketResult& packet_feedback);
absl::optional<DataRate> FetchAndResetLastEstimatedBitrate();
private:
struct AggregatedCluster {
int num_probes = 0;
Timestamp first_send = Timestamp::PlusInfinity();
Timestamp last_send = Timestamp::MinusInfinity();
Timestamp first_receive = Timestamp::PlusInfinity();
Timestamp last_receive = Timestamp::MinusInfinity();
DataSize size_last_send = DataSize::Zero();
DataSize size_first_receive = DataSize::Zero();
DataSize size_total = DataSize::Zero();
};
// Erases old cluster data that was seen before `timestamp`.
void EraseOldClusters(Timestamp timestamp);
std::map<int, AggregatedCluster> clusters_;
RtcEventLog* const event_log_;
absl::optional<DataRate> estimated_data_rate_;
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_GOOG_CC_PROBE_BITRATE_ESTIMATOR_H_
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