flexfec_receiver.h

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/*

 *  Copyright (c) 2016 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_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_

#define MODULES_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_

#include <stdint.h>

#include <memory>

#include "api/sequence_checker.h"

#include "api/units/timestamp.h"

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

#include "modules/rtp_rtcp/source/forward_error_correction.h"

#include "modules/rtp_rtcp/source/rtp_packet_received.h"

#include "modules/rtp_rtcp/source/ulpfec_receiver.h"

#include "rtc_base/system/no_unique_address.h"

#include "rtc_base/thread_annotations.h"

namespace webrtc {

class Clock;

class FlexfecReceiver {

 public:

  /* Mozilla: Avoid this since it could use GetRealTimeClock().

  FlexfecReceiver(uint32_t ssrc,

                  uint32_t protected_media_ssrc,

                  RecoveredPacketReceiver* recovered_packet_receiver);

*/

  FlexfecReceiver(Clock* clock,

                  uint32_t ssrc,

                  uint32_t protected_media_ssrc,

                  RecoveredPacketReceiver* recovered_packet_receiver);

  ~FlexfecReceiver();

  // Inserts a received packet (can be either media or FlexFEC) into the

  // internal buffer, and sends the received packets to the erasure code.

  // All newly recovered packets are sent back through the callback.

  void OnRtpPacket(const RtpPacketReceived& packet);

  // Returns a counter describing the added and recovered packets.

  FecPacketCounter GetPacketCounter() const;

  // Protected to aid testing.

 protected:

  std::unique_ptr<ForwardErrorCorrection::ReceivedPacket> AddReceivedPacket(

      const RtpPacketReceived& packet);

  void ProcessReceivedPacket(

      const ForwardErrorCorrection::ReceivedPacket& received_packet);

 private:

  // Config.

  const uint32_t ssrc_;

  const uint32_t protected_media_ssrc_;

  // Erasure code interfacing and callback.

  std::unique_ptr<ForwardErrorCorrection> erasure_code_

      RTC_GUARDED_BY(sequence_checker_);

  ForwardErrorCorrection::RecoveredPacketList recovered_packets_

      RTC_GUARDED_BY(sequence_checker_);

  RecoveredPacketReceiver* const recovered_packet_receiver_;

  // Logging and stats.

  Clock* const clock_;

  Timestamp last_recovered_packet_ RTC_GUARDED_BY(sequence_checker_) =

      Timestamp::MinusInfinity();

  FecPacketCounter packet_counter_ RTC_GUARDED_BY(sequence_checker_);

  RTC_NO_UNIQUE_ADDRESS SequenceChecker sequence_checker_;

};

}  // namespace webrtc

#endif  // MODULES_RTP_RTCP_INCLUDE_FLEXFEC_RECEIVER_H_