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/*
* Copyright (c) 2015 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_REMOTE_BITRATE_ESTIMATOR_REMOTE_BITRATE_ESTIMATOR_ABS_SEND_TIME_H_
#define MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_BITRATE_ESTIMATOR_ABS_SEND_TIME_H_
#include <stddef.h>
#include <stdint.h>
#include <list>
#include <map>
#include <memory>
#include <vector>
#include "api/rtp_headers.h"
#include "api/transport/field_trial_based_config.h"
#include "api/units/data_rate.h"
#include "api/units/data_size.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "modules/remote_bitrate_estimator/aimd_rate_control.h"
#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "modules/remote_bitrate_estimator/inter_arrival.h"
#include "modules/remote_bitrate_estimator/overuse_detector.h"
#include "modules/remote_bitrate_estimator/overuse_estimator.h"
#include "rtc_base/bitrate_tracker.h"
#include "rtc_base/checks.h"
#include "system_wrappers/include/clock.h"
namespace webrtc {
class RemoteBitrateEstimatorAbsSendTime : public RemoteBitrateEstimator {
public:
RemoteBitrateEstimatorAbsSendTime(RemoteBitrateObserver* observer,
Clock* clock);
RemoteBitrateEstimatorAbsSendTime() = delete;
RemoteBitrateEstimatorAbsSendTime(const RemoteBitrateEstimatorAbsSendTime&) =
delete;
RemoteBitrateEstimatorAbsSendTime& operator=(
const RemoteBitrateEstimatorAbsSendTime&) = delete;
~RemoteBitrateEstimatorAbsSendTime() override;
void IncomingPacket(const RtpPacketReceived& rtp_packet) override;
TimeDelta Process() override;
void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
void RemoveStream(uint32_t ssrc) override;
DataRate LatestEstimate() const override;
private:
struct Probe {
Probe(Timestamp send_time, Timestamp recv_time, DataSize payload_size)
: send_time(send_time),
recv_time(recv_time),
payload_size(payload_size) {}
Timestamp send_time;
Timestamp recv_time;
DataSize payload_size;
};
struct Cluster {
DataRate SendBitrate() const { return mean_size / send_mean; }
DataRate RecvBitrate() const { return mean_size / recv_mean; }
TimeDelta send_mean = TimeDelta::Zero();
TimeDelta recv_mean = TimeDelta::Zero();
// TODO(holmer): Add some variance metric as well?
DataSize mean_size = DataSize::Zero();
int count = 0;
int num_above_min_delta = 0;
};
enum class ProbeResult { kBitrateUpdated, kNoUpdate };
static bool IsWithinClusterBounds(TimeDelta send_delta,
const Cluster& cluster_aggregate);
static void MaybeAddCluster(const Cluster& cluster_aggregate,
std::list<Cluster>& clusters);
std::list<Cluster> ComputeClusters() const;
const Cluster* FindBestProbe(const std::list<Cluster>& clusters) const;
// Returns true if a probe which changed the estimate was detected.
ProbeResult ProcessClusters(Timestamp now);
bool IsBitrateImproving(DataRate probe_bitrate) const;
void TimeoutStreams(Timestamp now);
Clock* const clock_;
const FieldTrialBasedConfig field_trials_;
RemoteBitrateObserver* const observer_;
std::unique_ptr<InterArrival> inter_arrival_;
std::unique_ptr<OveruseEstimator> estimator_;
OveruseDetector detector_;
BitrateTracker incoming_bitrate_{kBitrateWindow};
bool incoming_bitrate_initialized_ = false;
std::list<Probe> probes_;
size_t total_probes_received_ = 0;
Timestamp first_packet_time_ = Timestamp::MinusInfinity();
Timestamp last_update_ = Timestamp::MinusInfinity();
bool uma_recorded_ = false;
std::map<uint32_t, Timestamp> ssrcs_;
AimdRateControl remote_rate_;
};
} // namespace webrtc
#endif // MODULES_REMOTE_BITRATE_ESTIMATOR_REMOTE_BITRATE_ESTIMATOR_ABS_SEND_TIME_H_
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