text: /*
   *  Copyright (c) 2019 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 "rtc_base/experiments/quality_scaler_settings.h"
  
  #include "api/transport/field_trial_based_config.h"
  #include "rtc_base/logging.h"
  
  namespace webrtc {
  namespace {
  const int kMinFrames = 10;
  const double kMinScaleFactor = 0.01;
  }  // namespace
  
  QualityScalerSettings::QualityScalerSettings(
      const WebRtcKeyValueConfig* const key_value_config)
      : sampling_period_ms_("sampling_period_ms"),
        average_qp_window_("average_qp_window"),
        min_frames_("min_frames"),
        initial_scale_factor_("initial_scale_factor"),
        scale_factor_("scale_factor"),
        initial_bitrate_interval_ms_("initial_bitrate_interval_ms"),
        initial_bitrate_factor_("initial_bitrate_factor") {
    ParseFieldTrial(
        {&sampling_period_ms_, &average_qp_window_, &min_frames_,
         &initial_scale_factor_, &scale_factor_, &initial_bitrate_interval_ms_,
         &initial_bitrate_factor_},
        key_value_config->Lookup("WebRTC-Video-QualityScalerSettings"));
  }
  
  QualityScalerSettings QualityScalerSettings::ParseFromFieldTrials() {
    FieldTrialBasedConfig field_trial_config;
    return QualityScalerSettings(&field_trial_config);
  }
  
  absl::optional<int> QualityScalerSettings::SamplingPeriodMs() const {
    if (sampling_period_ms_ && sampling_period_ms_.Value() <= 0) {
      RTC_LOG(LS_WARNING) << "Unsupported sampling_period_ms value, ignored.";
      return absl::nullopt;
    }
    return sampling_period_ms_.GetOptional();
  }
  
  absl::optional<int> QualityScalerSettings::AverageQpWindow() const {
    if (average_qp_window_ && average_qp_window_.Value() <= 0) {
      RTC_LOG(LS_WARNING) << "Unsupported average_qp_window value, ignored.";
      return absl::nullopt;
    }
    return average_qp_window_.GetOptional();
  }
  
  absl::optional<int> QualityScalerSettings::MinFrames() const {
    if (min_frames_ && min_frames_.Value() < kMinFrames) {
      RTC_LOG(LS_WARNING) << "Unsupported min_frames value, ignored.";
      return absl::nullopt;
    }
    return min_frames_.GetOptional();
  }
  
  absl::optional<double> QualityScalerSettings::InitialScaleFactor() const {
    if (initial_scale_factor_ &&
        initial_scale_factor_.Value() < kMinScaleFactor) {
      RTC_LOG(LS_WARNING) << "Unsupported initial_scale_factor value, ignored.";
      return absl::nullopt;
    }
    return initial_scale_factor_.GetOptional();
  }
  
  absl::optional<double> QualityScalerSettings::ScaleFactor() const {
    if (scale_factor_ && scale_factor_.Value() < kMinScaleFactor) {
      RTC_LOG(LS_WARNING) << "Unsupported scale_factor value, ignored.";
      return absl::nullopt;
    }
    return scale_factor_.GetOptional();
  }
  
  absl::optional<int> QualityScalerSettings::InitialBitrateIntervalMs() const {
    if (initial_bitrate_interval_ms_ &&
        initial_bitrate_interval_ms_.Value() < 0) {
      RTC_LOG(LS_WARNING) << "Unsupported bitrate_interval value, ignored.";
      return absl::nullopt;
    }
    return initial_bitrate_interval_ms_.GetOptional();
  }
  
  absl::optional<double> QualityScalerSettings::InitialBitrateFactor() const {
    if (initial_bitrate_factor_ &&
        initial_bitrate_factor_.Value() < kMinScaleFactor) {
      RTC_LOG(LS_WARNING) << "Unsupported initial_bitrate_factor value, ignored.";
      return absl::nullopt;
    }
    return initial_bitrate_factor_.GetOptional();
  }
  
  }  // namespace webrtc
  