Tweaked version of BBR for WebRTC.

webrtc/modules/remote_bitrate_estimator/test/bbr_paced_sender.h

+/*
+ *  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 WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_BBR_PACED_SENDER_H_
+#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_BBR_PACED_SENDER_H_
+
+#include <list>
+#include <memory>
+
+#include "webrtc/modules/pacing/paced_sender.h"
+#include "webrtc/modules/pacing/pacer.h"
+
+namespace webrtc {
+namespace testing {
+namespace bwe {
+class CongestionWindow;
+}
+}  // namespace testing
+
+struct Packet {
+  Packet(RtpPacketSender::Priority priority,
+         uint32_t ssrc,
+         uint16_t seq_number,
+         int64_t capture_time_ms,
+         int64_t enqueue_time_ms,
+         size_t size_in_bytes,
+         bool retransmission)
+      : priority(priority),
+        ssrc(ssrc),
+        sequence_number(seq_number),
+        capture_time_ms(capture_time_ms),
+        enqueue_time_ms(enqueue_time_ms),
+        size_in_bytes(size_in_bytes),
+        retransmission(retransmission) {}
+  RtpPacketSender::Priority priority;
+  uint32_t ssrc;
+  uint16_t sequence_number;
+  int64_t capture_time_ms;
+  int64_t enqueue_time_ms;
+  size_t size_in_bytes;
+  bool retransmission;
+};
+
+class Clock;
+class RtcEventLog;
+struct Packet;
+class BbrPacedSender : public Pacer {
+ public:
+  BbrPacedSender(const Clock* clock,
+                 PacedSender::PacketSender* packet_sender,
+                 RtcEventLog* event_log);
+  ~BbrPacedSender() override;
+  void SetEstimatedBitrateAndCongestionWindow(
+      uint32_t bitrate_bps,
+      bool in_probe_rtt,
+      uint64_t congestion_window) override;
+  void SetMinBitrate(int min_send_bitrate_bps);
+  void InsertPacket(RtpPacketSender::Priority priority,
+                    uint32_t ssrc,
+                    uint16_t sequence_number,
+                    int64_t capture_time_ms,
+                    size_t bytes,
+                    bool retransmission) override;
+  int64_t TimeUntilNextProcess() override;
+  void OnBytesAcked(size_t bytes) override;
+  void Process() override;
+  bool TryToSendPacket(Packet* packet);
+
+ private:
+  const Clock* const clock_;
+  PacedSender::PacketSender* const packet_sender_;
+  uint32_t estimated_bitrate_bps_;
+  uint32_t min_send_bitrate_kbps_;
+  uint32_t pacing_bitrate_kbps_;
+  int64_t time_last_update_us_;
+  int64_t time_last_update_ms_;
+  int64_t next_packet_send_time_;
+  float rounding_error_time_ms_;
+  std::list<Packet*> packets_;
+  // TODO(gnish): integrate |max_data_inflight| into congestion window class.
+  size_t max_data_inflight_bytes_;
+  std::unique_ptr<testing::bwe::CongestionWindow> congestion_window_;
+};
+}  // namespace webrtc
+#endif  // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_BBR_PACED_SENDER_H_