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* Copyright 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 "absl/types/optional.h"
#include "api/video_codecs/video_encoder.h"
namespace webrtc {
class QualityScalingExperiment {
struct Settings {
int vp8_low; // VP8: low QP threshold.
int vp8_high; // VP8: high QP threshold.
int vp9_low; // VP9: low QP threshold.
int vp9_high; // VP9: high QP threshold.
int h264_low; // H264: low QP threshold.
int h264_high; // H264: high QP threshold.
int generic_low; // Generic: low QP threshold.
int generic_high; // Generic: high QP threshold.
float alpha_high; // |alpha_| for ExpFilter used when checking high QP.
float alpha_low; // |alpha_| for ExpFilter used when checking low QP.
int drop; // >0 sets |use_all_drop_reasons| to true.
// Used by QualityScaler.
struct Config {
float alpha_high = 0.9995f;
float alpha_low = 0.9999f;
// If set, all type of dropped frames are used.
// Otherwise only dropped frames by MediaOptimization are used.
bool use_all_drop_reasons = false;
// Returns true if the experiment is enabled.
static bool Enabled();
// Returns settings from field trial.
static absl::optional<Settings> ParseSettings();
// Returns QpThresholds for the |codec_type|.
static absl::optional<VideoEncoder::QpThresholds> GetQpThresholds(
VideoCodecType codec_type);
// Returns parsed values. If the parsing fails, default values are returned.
static Config GetConfig();
} // namespace webrtc