congestion_window_pushback_controller.h

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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_GOOG_CC_CONGESTION_WINDOW_PUSHBACK_CONTROLLER_H_

#define MODULES_CONGESTION_CONTROLLER_GOOG_CC_CONGESTION_WINDOW_PUSHBACK_CONTROLLER_H_

#include <stdint.h>

#include "absl/types/optional.h"

#include "api/field_trials_view.h"

#include "api/units/data_size.h"

namespace webrtc {

// This class enables pushback from congestion window directly to video encoder.

// When the congestion window is filling up, the video encoder target bitrate

// will be reduced accordingly to accommodate the network changes. To avoid

// pausing video too frequently, a minimum encoder target bitrate threshold is

// used to prevent video pause due to a full congestion window.

class CongestionWindowPushbackController {

 public:

  explicit CongestionWindowPushbackController(

      const FieldTrialsView& key_value_config);

  void UpdateOutstandingData(int64_t outstanding_bytes);

  void UpdatePacingQueue(int64_t pacing_bytes);

  uint32_t UpdateTargetBitrate(uint32_t bitrate_bps);

  void SetDataWindow(DataSize data_window);

 private:

  const bool add_pacing_;

  const uint32_t min_pushback_target_bitrate_bps_;

  absl::optional<DataSize> current_data_window_;

  int64_t outstanding_bytes_ = 0;

  int64_t pacing_bytes_ = 0;

  double encoding_rate_ratio_ = 1.0;

};

}  // namespace webrtc

#endif  // MODULES_CONGESTION_CONTROLLER_GOOG_CC_CONGESTION_WINDOW_PUSHBACK_CONTROLLER_H_