control_handler.h - mozsearch

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/*

 *  Copyright (c) 2018 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_CONTROL_HANDLER_H_

#define MODULES_CONGESTION_CONTROLLER_RTP_CONTROL_HANDLER_H_

#include <stdint.h>

#include "absl/types/optional.h"

#include "api/sequence_checker.h"

#include "api/transport/network_types.h"

#include "api/units/data_size.h"

#include "api/units/time_delta.h"

#include "rtc_base/system/no_unique_address.h"

namespace webrtc {

// This is used to observe the network controller state and route calls to

// the proper handler. It also keeps cached values for safe asynchronous use.

// This makes sure that things running on the worker queue can't access state

// in RtpTransportControllerSend, which would risk causing data race on

// destruction unless members are properly ordered.

class CongestionControlHandler {

 public:

  CongestionControlHandler() = default;

  CongestionControlHandler(const CongestionControlHandler&) = delete;

  CongestionControlHandler& operator=(const CongestionControlHandler&) = delete;

  ~CongestionControlHandler() = default;

  void SetTargetRate(TargetTransferRate new_target_rate);

  void SetNetworkAvailability(bool network_available);

  void SetPacerQueue(TimeDelta expected_queue_time);

  absl::optional<TargetTransferRate> GetUpdate();

 private:

  absl::optional<TargetTransferRate> last_incoming_;

  absl::optional<TargetTransferRate> last_reported_;

  bool network_available_ = true;

  bool encoder_paused_in_last_report_ = false;

  int64_t pacer_expected_queue_ms_ = 0;

  RTC_NO_UNIQUE_ADDRESS SequenceChecker sequenced_checker_;

};

}  // namespace webrtc

#endif  // MODULES_CONGESTION_CONTROLLER_RTP_CONTROL_HANDLER_H_