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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.
*/
#include "modules/congestion_controller/goog_cc/congestion_window_pushback_controller.h"
#include <algorithm>
#include <cstdint>
#include "api/field_trials_view.h"
#include "api/units/data_size.h"
#include "rtc_base/experiments/rate_control_settings.h"
namespace webrtc {
CongestionWindowPushbackController::CongestionWindowPushbackController(
const FieldTrialsView& key_value_config)
: add_pacing_(key_value_config.IsEnabled(
"WebRTC-AddPacingToCongestionWindowPushback")),
min_pushback_target_bitrate_bps_(
RateControlSettings(key_value_config)
.CongestionWindowMinPushbackTargetBitrateBps()),
current_data_window_(RateControlSettings(key_value_config)
.CongestionWindowInitialDataWindow()) {}
void CongestionWindowPushbackController::UpdateOutstandingData(
int64_t outstanding_bytes) {
outstanding_bytes_ = outstanding_bytes;
}
void CongestionWindowPushbackController::UpdatePacingQueue(
int64_t pacing_bytes) {
pacing_bytes_ = pacing_bytes;
}
void CongestionWindowPushbackController::SetDataWindow(DataSize data_window) {
current_data_window_ = data_window;
}
uint32_t CongestionWindowPushbackController::UpdateTargetBitrate(
uint32_t bitrate_bps) {
if (!current_data_window_ || current_data_window_->IsZero())
return bitrate_bps;
int64_t total_bytes = outstanding_bytes_;
if (add_pacing_)
total_bytes += pacing_bytes_;
double fill_ratio =
total_bytes / static_cast<double>(current_data_window_->bytes());
if (fill_ratio > 1.5) {
encoding_rate_ratio_ *= 0.9;
} else if (fill_ratio > 1) {
encoding_rate_ratio_ *= 0.95;
} else if (fill_ratio < 0.1) {
encoding_rate_ratio_ = 1.0;
} else {
encoding_rate_ratio_ *= 1.05;
encoding_rate_ratio_ = std::min(encoding_rate_ratio_, 1.0);
}
uint32_t adjusted_target_bitrate_bps =
static_cast<uint32_t>(bitrate_bps * encoding_rate_ratio_);
// Do not adjust below the minimum pushback bitrate but do obey if the
// original estimate is below it.
bitrate_bps = adjusted_target_bitrate_bps < min_pushback_target_bitrate_bps_
? std::min(bitrate_bps, min_pushback_target_bitrate_bps_)
: adjusted_target_bitrate_bps;
return bitrate_bps;
}
} // namespace webrtc