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71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "congestion_window_pushback_controller.h"
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#include <algorithm>
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#include <cstdint>
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#include "api/units/data_size.h"
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namespace webrtc {
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const int kDefaultMinPushbackTargetBitrateBps = 30000;
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CongestionWindowPushbackController::CongestionWindowPushbackController()
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: add_pacing_(false),
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min_pushback_target_bitrate_bps_(kDefaultMinPushbackTargetBitrateBps),
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current_data_window_(
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DataSize::Bytes(kDefaultMinPushbackTargetBitrateBps)) {}
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void CongestionWindowPushbackController::UpdateOutstandingData(
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int64_t outstanding_bytes) {
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outstanding_bytes_ = outstanding_bytes;
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}
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void CongestionWindowPushbackController::UpdatePacingQueue(
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int64_t pacing_bytes) {
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pacing_bytes_ = pacing_bytes;
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}
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void CongestionWindowPushbackController::SetDataWindow(DataSize data_window) {
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current_data_window_ = data_window;
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}
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uint32_t CongestionWindowPushbackController::UpdateTargetBitrate(
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uint32_t bitrate_bps) {
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if (!current_data_window_ || current_data_window_->IsZero())
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return bitrate_bps;
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int64_t total_bytes = outstanding_bytes_;
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if (add_pacing_) total_bytes += pacing_bytes_;
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double fill_ratio =
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total_bytes / static_cast<double>(current_data_window_->bytes());
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if (fill_ratio > 1.5) {
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encoding_rate_ratio_ *= 0.9;
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} else if (fill_ratio > 1) {
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encoding_rate_ratio_ *= 0.95;
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} else if (fill_ratio < 0.1) {
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encoding_rate_ratio_ = 1.0;
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} else {
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encoding_rate_ratio_ *= 1.05;
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encoding_rate_ratio_ = std::min(encoding_rate_ratio_, 1.0);
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}
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uint32_t adjusted_target_bitrate_bps =
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static_cast<uint32_t>(bitrate_bps * encoding_rate_ratio_);
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// Do not adjust below the minimum pushback bitrate but do obey if the
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// original estimate is below it.
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bitrate_bps = adjusted_target_bitrate_bps < min_pushback_target_bitrate_bps_
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? std::min(bitrate_bps, min_pushback_target_bitrate_bps_)
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: adjusted_target_bitrate_bps;
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return bitrate_bps;
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}
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} // namespace webrtc
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