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/*
* Copyright (c) 2017 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_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
#define MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
#include <memory>
#include <vector>
#include "api/transport/field_trial_based_config.h"
#include "api/transport/network_control.h"
#include "modules/include/module.h"
#include "modules/remote_bitrate_estimator/remote_estimator_proxy.h"
#include "rtc_base/synchronization/mutex.h"
namespace webrtc {
class RemoteBitrateEstimator;
class RemoteBitrateObserver;
// This class represents the congestion control state for receive
// streams. For send side bandwidth estimation, this is simply
// relaying for each received RTP packet back to the sender. While for
// receive side bandwidth estimation, we do the estimation locally and
// send our results back to the sender.
class ReceiveSideCongestionController : public CallStatsObserver,
public Module {
public:
ReceiveSideCongestionController(Clock* clock, PacketRouter* packet_router);
ReceiveSideCongestionController(
Clock* clock,
PacketRouter* packet_router,
NetworkStateEstimator* network_state_estimator);
~ReceiveSideCongestionController() override {}
virtual void OnReceivedPacket(int64_t arrival_time_ms,
size_t payload_size,
const RTPHeader& header);
void SetSendPeriodicFeedback(bool send_periodic_feedback);
// TODO(nisse): Delete these methods, design a more specific interface.
virtual RemoteBitrateEstimator* GetRemoteBitrateEstimator(bool send_side_bwe);
virtual const RemoteBitrateEstimator* GetRemoteBitrateEstimator(
bool send_side_bwe) const;
// Implements CallStatsObserver.
void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
// This is send bitrate, used to control the rate of feedback messages.
void OnBitrateChanged(int bitrate_bps);
// Implements Module.
int64_t TimeUntilNextProcess() override;
void Process() override;
private:
class WrappingBitrateEstimator : public RemoteBitrateEstimator {
public:
WrappingBitrateEstimator(RemoteBitrateObserver* observer, Clock* clock);
WrappingBitrateEstimator() = delete;
WrappingBitrateEstimator(const WrappingBitrateEstimator&) = delete;
WrappingBitrateEstimator& operator=(const WrappingBitrateEstimator&) =
delete;
~WrappingBitrateEstimator() override;
void IncomingPacket(int64_t arrival_time_ms,
size_t payload_size,
const RTPHeader& header) override;
void Process() override;
int64_t TimeUntilNextProcess() override;
void OnRttUpdate(int64_t avg_rtt_ms, int64_t max_rtt_ms) override;
void RemoveStream(unsigned int ssrc) override;
bool LatestEstimate(std::vector<unsigned int>* ssrcs,
unsigned int* bitrate_bps) const override;
void SetMinBitrate(int min_bitrate_bps) override;
private:
void PickEstimatorFromHeader(const RTPHeader& header)
RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
void PickEstimator() RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
RemoteBitrateObserver* observer_;
Clock* const clock_;
mutable Mutex mutex_;
std::unique_ptr<RemoteBitrateEstimator> rbe_;
bool using_absolute_send_time_;
uint32_t packets_since_absolute_send_time_;
int min_bitrate_bps_;
};
const FieldTrialBasedConfig field_trial_config_;
WrappingBitrateEstimator remote_bitrate_estimator_;
RemoteEstimatorProxy remote_estimator_proxy_;
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_
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