1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/congestion_controller/include/receive_side_congestion_controller.h b/third_party/libwebrtc/modules/congestion_controller/include/receive_side_congestion_controller.h
new file mode 100644
index 0000000000..8d81ccbe69
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+++ b/third_party/libwebrtc/modules/congestion_controller/include/receive_side_congestion_controller.h
@@ -0,0 +1,87 @@
+/*
+ *  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/network_control.h"
+#include "api/units/data_rate.h"
+#include "api/units/time_delta.h"
+#include "modules/congestion_controller/remb_throttler.h"
+#include "modules/pacing/packet_router.h"
+#include "modules/remote_bitrate_estimator/remote_estimator_proxy.h"
+#include "modules/rtp_rtcp/source/rtp_packet_received.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+class RemoteBitrateEstimator;
+
+// 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:
+  ReceiveSideCongestionController(
+      Clock* clock,
+      RemoteEstimatorProxy::TransportFeedbackSender feedback_sender,
+      RembThrottler::RembSender remb_sender,
+      NetworkStateEstimator* network_state_estimator);
+
+  ~ReceiveSideCongestionController() override {}
+
+  void OnReceivedPacket(const RtpPacketReceived& packet, MediaType media_type);
+
+  // 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);
+
+  // Ensures the remote party is notified of the receive bitrate no larger than
+  // `bitrate` using RTCP REMB.
+  void SetMaxDesiredReceiveBitrate(DataRate bitrate);
+
+  void SetTransportOverhead(DataSize overhead_per_packet);
+
+  // Returns latest receive side bandwidth estimation.
+  // Returns zero if receive side bandwidth estimation is unavailable.
+  DataRate LatestReceiveSideEstimate() const;
+
+  // Removes stream from receive side bandwidth estimation.
+  // Noop if receive side bwe is not used or stream doesn't participate in it.
+  void RemoveStream(uint32_t ssrc);
+
+  // Runs periodic tasks if it is time to run them, returns time until next
+  // call to `MaybeProcess` should be non idle.
+  TimeDelta MaybeProcess();
+
+ private:
+  void PickEstimator(bool has_absolute_send_time)
+      RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+
+  Clock& clock_;
+  RembThrottler remb_throttler_;
+  RemoteEstimatorProxy remote_estimator_proxy_;
+
+  mutable Mutex mutex_;
+  std::unique_ptr<RemoteBitrateEstimator> rbe_ RTC_GUARDED_BY(mutex_);
+  bool using_absolute_send_time_ RTC_GUARDED_BY(mutex_);
+  uint32_t packets_since_absolute_send_time_ RTC_GUARDED_BY(mutex_);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_CONGESTION_CONTROLLER_INCLUDE_RECEIVE_SIDE_CONGESTION_CONTROLLER_H_