Repo created

TMessagesProj/jni/voip/webrtc/modules/congestion_controller/remb_throttler.h

@@ -0,0 +1,54 @@
+/*
+ *  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 <functional>
+#include <vector>
+
+#include "api/units/data_rate.h"
+#include "api/units/time_delta.h"
+#include "api/units/timestamp.h"
+#include "modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
+#include "rtc_base/synchronization/mutex.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_