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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_
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