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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.
*
*/
// Implementation of Network-Assisted Dynamic Adaptation's (NADA's) proposal
// Version according to Draft Document (mentioned in references)
// http://tools.ietf.org/html/draft-zhu-rmcat-nada-06
// From March 26, 2015.
#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_NADA_H_
#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_NADA_H_
#include <list>
#include <map>
#include "webrtc/modules/interface/module_common_types.h"
#include "webrtc/modules/remote_bitrate_estimator/test/bwe.h"
#include "webrtc/voice_engine/channel.h"
namespace webrtc {
class ReceiveStatistics;
namespace testing {
namespace bwe {
class NadaBweReceiver : public BweReceiver {
public:
explicit NadaBweReceiver(int flow_id);
virtual ~NadaBweReceiver();
void ReceivePacket(int64_t arrival_time_ms,
const MediaPacket& media_packet) override;
FeedbackPacket* GetFeedback(int64_t now_ms) override;
static int64_t MedianFilter(int64_t* v, int size);
static int64_t ExponentialSmoothingFilter(int64_t new_value,
int64_t last_smoothed_value,
float alpha);
static const int64_t kReceivingRateTimeWindowMs;
private:
SimulatedClock clock_;
int64_t last_feedback_ms_;
rtc::scoped_ptr<ReceiveStatistics> recv_stats_;
int64_t baseline_delay_ms_; // Referred as d_f.
int64_t delay_signal_ms_; // Referred as d_n.
int64_t last_congestion_signal_ms_;
int last_delays_index_;
int64_t exp_smoothed_delay_ms_; // Referred as d_hat_n.
int64_t est_queuing_delay_signal_ms_; // Referred as d_tilde_n.
int64_t last_delays_ms_[5]; // Used for Median Filter.
};
class NadaBweSender : public BweSender {
public:
NadaBweSender(int kbps, BitrateObserver* observer, Clock* clock);
NadaBweSender(BitrateObserver* observer, Clock* clock);
virtual ~NadaBweSender();
int GetFeedbackIntervalMs() const override;
// Updates the min_feedback_delay_ms_ and the min_round_trip_time_ms_.
void GiveFeedback(const FeedbackPacket& feedback) override;
void OnPacketsSent(const Packets& packets) override {}
int64_t TimeUntilNextProcess() override;
int Process() override;
void AcceleratedRampUp(const NadaFeedback& fb);
void AcceleratedRampDown(const NadaFeedback& fb);
void GradualRateUpdate(const NadaFeedback& fb,
float delta_s,
double smoothing_factor);
int bitrate_kbps() const { return bitrate_kbps_; }
void set_bitrate_kbps(int bitrate_kbps) { bitrate_kbps_ = bitrate_kbps; }
bool original_operating_mode() const { return original_operating_mode_; }
void set_original_operating_mode(bool original_operating_mode) {
original_operating_mode_ = original_operating_mode;
}
int64_t NowMs() const { return clock_->TimeInMilliseconds(); }
private:
Clock* const clock_;
BitrateObserver* const observer_;
// Used as an upper bound for calling AcceleratedRampDown.
const float kMaxCongestionSignalMs = 40.0f + kMinBitrateKbps / 15;
// Referred as R_min, default initialization for bitrate R_n.
int64_t last_feedback_ms_ = 0;
// Referred as delta_0, initialized as an upper bound.
int64_t min_feedback_delay_ms_ = 200;
// Referred as RTT_0, initialized as an upper bound.
int64_t min_round_trip_time_ms_ = 100;
bool original_operating_mode_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(NadaBweSender);
};
} // namespace bwe
} // namespace testing
} // namespace webrtc
#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_NADA_H_
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