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/*
* Copyright (c) 2021 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_REMB_THROTTLER_H_
#define MODULES_CONGESTION_CONTROLLER_REMB_THROTTLER_H_
#include <cstdint>
#include <functional>
#include <vector>
#include "api/units/data_rate.h"
#include "api/units/timestamp.h"
#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/thread_annotations.h"
#include "system_wrappers/include/clock.h"
namespace webrtc {
// RembThrottler is a helper class used for throttling RTCP REMB messages.
// Throttles small changes to the received BWE within 200ms.
class RembThrottler : public RemoteBitrateObserver {
public:
using RembSender =
std::function<void(int64_t bitrate_bps, std::vector<uint32_t> ssrcs)>;
RembThrottler(RembSender remb_sender, Clock* clock);
// Ensures the remote party is notified of the receive bitrate no larger than
// `bitrate` using RTCP REMB.
void SetMaxDesiredReceiveBitrate(DataRate bitrate);
// Implements RemoteBitrateObserver;
// Called every time there is a new bitrate estimate for a receive channel
// group. This call will trigger a new RTCP REMB packet if the bitrate
// estimate has decreased or if no RTCP REMB packet has been sent for
// a certain time interval.
void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
uint32_t bitrate_bps) override;
private:
const RembSender remb_sender_;
Clock* const clock_;
mutable Mutex mutex_;
Timestamp last_remb_time_ RTC_GUARDED_BY(mutex_);
DataRate last_send_remb_bitrate_ RTC_GUARDED_BY(mutex_);
DataRate max_remb_bitrate_ RTC_GUARDED_BY(mutex_);
};
} // namespace webrtc
#endif // MODULES_CONGESTION_CONTROLLER_REMB_THROTTLER_H_
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