1 /*
2 * Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "rtc_base/experiments/quality_scaler_settings.h"
12
13 #include "api/transport/field_trial_based_config.h"
14 #include "rtc_base/logging.h"
15
16 namespace webrtc {
17 namespace {
18 const int kMinFrames = 10;
19 const double kMinScaleFactor = 0.01;
20 } // namespace
21
QualityScalerSettings(const FieldTrialsView * const key_value_config)22 QualityScalerSettings::QualityScalerSettings(
23 const FieldTrialsView* const key_value_config)
24 : sampling_period_ms_("sampling_period_ms"),
25 average_qp_window_("average_qp_window"),
26 min_frames_("min_frames"),
27 initial_scale_factor_("initial_scale_factor"),
28 scale_factor_("scale_factor"),
29 initial_bitrate_interval_ms_("initial_bitrate_interval_ms"),
30 initial_bitrate_factor_("initial_bitrate_factor") {
31 ParseFieldTrial(
32 {&sampling_period_ms_, &average_qp_window_, &min_frames_,
33 &initial_scale_factor_, &scale_factor_, &initial_bitrate_interval_ms_,
34 &initial_bitrate_factor_},
35 key_value_config->Lookup("WebRTC-Video-QualityScalerSettings"));
36 }
37
ParseFromFieldTrials()38 QualityScalerSettings QualityScalerSettings::ParseFromFieldTrials() {
39 FieldTrialBasedConfig field_trial_config;
40 return QualityScalerSettings(&field_trial_config);
41 }
42
SamplingPeriodMs() const43 absl::optional<int> QualityScalerSettings::SamplingPeriodMs() const {
44 if (sampling_period_ms_ && sampling_period_ms_.Value() <= 0) {
45 RTC_LOG(LS_WARNING) << "Unsupported sampling_period_ms value, ignored.";
46 return absl::nullopt;
47 }
48 return sampling_period_ms_.GetOptional();
49 }
50
AverageQpWindow() const51 absl::optional<int> QualityScalerSettings::AverageQpWindow() const {
52 if (average_qp_window_ && average_qp_window_.Value() <= 0) {
53 RTC_LOG(LS_WARNING) << "Unsupported average_qp_window value, ignored.";
54 return absl::nullopt;
55 }
56 return average_qp_window_.GetOptional();
57 }
58
MinFrames() const59 absl::optional<int> QualityScalerSettings::MinFrames() const {
60 if (min_frames_ && min_frames_.Value() < kMinFrames) {
61 RTC_LOG(LS_WARNING) << "Unsupported min_frames value, ignored.";
62 return absl::nullopt;
63 }
64 return min_frames_.GetOptional();
65 }
66
InitialScaleFactor() const67 absl::optional<double> QualityScalerSettings::InitialScaleFactor() const {
68 if (initial_scale_factor_ &&
69 initial_scale_factor_.Value() < kMinScaleFactor) {
70 RTC_LOG(LS_WARNING) << "Unsupported initial_scale_factor value, ignored.";
71 return absl::nullopt;
72 }
73 return initial_scale_factor_.GetOptional();
74 }
75
ScaleFactor() const76 absl::optional<double> QualityScalerSettings::ScaleFactor() const {
77 if (scale_factor_ && scale_factor_.Value() < kMinScaleFactor) {
78 RTC_LOG(LS_WARNING) << "Unsupported scale_factor value, ignored.";
79 return absl::nullopt;
80 }
81 return scale_factor_.GetOptional();
82 }
83
InitialBitrateIntervalMs() const84 absl::optional<int> QualityScalerSettings::InitialBitrateIntervalMs() const {
85 if (initial_bitrate_interval_ms_ &&
86 initial_bitrate_interval_ms_.Value() < 0) {
87 RTC_LOG(LS_WARNING) << "Unsupported bitrate_interval value, ignored.";
88 return absl::nullopt;
89 }
90 return initial_bitrate_interval_ms_.GetOptional();
91 }
92
InitialBitrateFactor() const93 absl::optional<double> QualityScalerSettings::InitialBitrateFactor() const {
94 if (initial_bitrate_factor_ &&
95 initial_bitrate_factor_.Value() < kMinScaleFactor) {
96 RTC_LOG(LS_WARNING) << "Unsupported initial_bitrate_factor value, ignored.";
97 return absl::nullopt;
98 }
99 return initial_bitrate_factor_.GetOptional();
100 }
101
102 } // namespace webrtc
103