transport_feedback_adapter.h

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/*

 *  Copyright (c) 2015 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_RTP_TRANSPORT_FEEDBACK_ADAPTER_H_

#define MODULES_CONGESTION_CONTROLLER_RTP_TRANSPORT_FEEDBACK_ADAPTER_H_

#include <deque>

#include <map>

#include <utility>

#include <vector>

#include "api/sequence_checker.h"

#include "api/transport/network_types.h"

#include "api/units/timestamp.h"

#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"

#include "rtc_base/network/sent_packet.h"

#include "rtc_base/network_route.h"

#include "rtc_base/numerics/sequence_number_unwrapper.h"

#include "rtc_base/thread_annotations.h"

namespace webrtc {

struct PacketFeedback {

  PacketFeedback() = default;

  // Time corresponding to when this object was created.

  Timestamp creation_time = Timestamp::MinusInfinity();

  SentPacket sent;

  // Time corresponding to when the packet was received. Timestamped with the

  // receiver's clock. For unreceived packet, Timestamp::PlusInfinity() is

  // used.

  Timestamp receive_time = Timestamp::PlusInfinity();

  // The network route that this packet is associated with.

  rtc::NetworkRoute network_route;

};

class InFlightBytesTracker {

 public:

  void AddInFlightPacketBytes(const PacketFeedback& packet);

  void RemoveInFlightPacketBytes(const PacketFeedback& packet);

  DataSize GetOutstandingData(const rtc::NetworkRoute& network_route) const;

 private:

  struct NetworkRouteComparator {

    bool operator()(const rtc::NetworkRoute& a,

                    const rtc::NetworkRoute& b) const;

};

  std::map<rtc::NetworkRoute, DataSize, NetworkRouteComparator> in_flight_data_;

};

class TransportFeedbackAdapter {

 public:

  TransportFeedbackAdapter();

  void AddPacket(const RtpPacketSendInfo& packet_info,

                 size_t overhead_bytes,

                 Timestamp creation_time);

  std::optional<SentPacket> ProcessSentPacket(

      const rtc::SentPacket& sent_packet);

  std::optional<TransportPacketsFeedback> ProcessTransportFeedback(

      const rtcp::TransportFeedback& feedback,

      Timestamp feedback_receive_time);

  void SetNetworkRoute(const rtc::NetworkRoute& network_route);

  DataSize GetOutstandingData() const;

 private:

  enum class SendTimeHistoryStatus { kNotAdded, kOk, kDuplicate };

  std::vector<PacketResult> ProcessTransportFeedbackInner(

      const rtcp::TransportFeedback& feedback,

      Timestamp feedback_receive_time);

  DataSize pending_untracked_size_ = DataSize::Zero();

  Timestamp last_send_time_ = Timestamp::MinusInfinity();

  Timestamp last_untracked_send_time_ = Timestamp::MinusInfinity();

  RtpSequenceNumberUnwrapper seq_num_unwrapper_;

  std::map<int64_t, PacketFeedback> history_;

  // Sequence numbers are never negative, using -1 as it always < a real

  // sequence number.

  int64_t last_ack_seq_num_ = -1;

  InFlightBytesTracker in_flight_;

  Timestamp current_offset_ = Timestamp::MinusInfinity();

  Timestamp last_timestamp_ = Timestamp::MinusInfinity();

  rtc::NetworkRoute network_route_;

};

}  // namespace webrtc

#endif  // MODULES_CONGESTION_CONTROLLER_RTP_TRANSPORT_FEEDBACK_ADAPTER_H_