55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
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/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_CONGESTION_CONTROLLER_REMB_THROTTLER_H_
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#define MODULES_CONGESTION_CONTROLLER_REMB_THROTTLER_H_
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#include <functional>
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#include <vector>
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#include "api/units/data_rate.h"
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#include "api/units/time_delta.h"
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#include "api/units/timestamp.h"
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#include "modules/remote_bitrate_estimator/remote_estimator_proxy.h"
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#include "rtc_base/synchronization/mutex.h"
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namespace webrtc {
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// RembThrottler is a helper class used for throttling RTCP REMB messages.
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// Throttles small changes to the received BWE within 200ms.
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class RembThrottler : public RemoteBitrateObserver {
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public:
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using RembSender =
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std::function<void(int64_t bitrate_bps, std::vector<uint32_t> ssrcs)>;
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RembThrottler(RembSender remb_sender, Clock* clock);
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// Ensures the remote party is notified of the receive bitrate no larger than
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// |bitrate| using RTCP REMB.
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void SetMaxDesiredReceiveBitrate(DataRate bitrate);
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// Implements RemoteBitrateObserver;
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// Called every time there is a new bitrate estimate for a receive channel
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// group. This call will trigger a new RTCP REMB packet if the bitrate
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// estimate has decreased or if no RTCP REMB packet has been sent for
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// a certain time interval.
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void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
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uint32_t bitrate_bps) override;
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private:
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const RembSender remb_sender_;
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Clock* const clock_;
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mutable Mutex mutex_;
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Timestamp last_remb_time_ RTC_GUARDED_BY(mutex_);
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DataRate last_send_remb_bitrate_ RTC_GUARDED_BY(mutex_);
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DataRate max_remb_bitrate_ RTC_GUARDED_BY(mutex_);
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};
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} // namespace webrtc
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#endif // MODULES_CONGESTION_CONTROLLER_REMB_THROTTLER_H_
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