| /* |
| * 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 <inttypes.h> |
| #include <stdio.h> |
| |
| #include <algorithm> |
| #include <string> |
| |
| #include "absl/strings/match.h" |
| #include "rtc_base/checks.h" |
| #include "rtc_base/experiments/rate_control_settings.h" |
| |
| namespace webrtc { |
| |
| CongestionWindowPushbackController::CongestionWindowPushbackController( |
| const WebRtcKeyValueConfig* key_value_config) |
| : add_pacing_( |
| absl::StartsWith(key_value_config->Lookup( |
| "WebRTC-AddPacingToCongestionWindowPushback"), |
| "Enabled")), |
| min_pushback_target_bitrate_bps_( |
| RateControlSettings::ParseFromKeyValueConfig(key_value_config) |
| .CongestionWindowMinPushbackTargetBitrateBps()), |
| current_data_window_( |
| RateControlSettings::ParseFromKeyValueConfig(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 |