98 lines
3.7 KiB
C++
98 lines
3.7 KiB
C++
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/*
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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 "rtc_base/experiments/alr_experiment.h"
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#include <inttypes.h>
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#include <stdio.h>
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#include <string>
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#include "api/transport/field_trial_based_config.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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const char AlrExperimentSettings::kScreenshareProbingBweExperimentName[] =
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"WebRTC-ProbingScreenshareBwe";
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const char AlrExperimentSettings::kStrictPacingAndProbingExperimentName[] =
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"WebRTC-StrictPacingAndProbing";
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const char kDefaultProbingScreenshareBweSettings[] = "1.0,2875,80,40,-60,3";
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bool AlrExperimentSettings::MaxOneFieldTrialEnabled() {
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return AlrExperimentSettings::MaxOneFieldTrialEnabled(
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FieldTrialBasedConfig());
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}
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bool AlrExperimentSettings::MaxOneFieldTrialEnabled(
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const WebRtcKeyValueConfig& key_value_config) {
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return key_value_config.Lookup(kStrictPacingAndProbingExperimentName)
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.empty() ||
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key_value_config.Lookup(kScreenshareProbingBweExperimentName).empty();
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}
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absl::optional<AlrExperimentSettings>
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AlrExperimentSettings::CreateFromFieldTrial(const char* experiment_name) {
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return AlrExperimentSettings::CreateFromFieldTrial(FieldTrialBasedConfig(),
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experiment_name);
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}
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absl::optional<AlrExperimentSettings>
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AlrExperimentSettings::CreateFromFieldTrial(
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const WebRtcKeyValueConfig& key_value_config,
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const char* experiment_name) {
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absl::optional<AlrExperimentSettings> ret;
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std::string group_name = key_value_config.Lookup(experiment_name);
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const std::string kIgnoredSuffix = "_Dogfood";
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std::string::size_type suffix_pos = group_name.rfind(kIgnoredSuffix);
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if (suffix_pos != std::string::npos &&
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suffix_pos == group_name.length() - kIgnoredSuffix.length()) {
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group_name.resize(group_name.length() - kIgnoredSuffix.length());
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}
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if (group_name.empty()) {
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if (experiment_name == kScreenshareProbingBweExperimentName) {
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// This experiment is now default-on with fixed settings.
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// TODO(sprang): Remove this kill-switch and clean up experiment code.
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group_name = kDefaultProbingScreenshareBweSettings;
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} else {
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return ret;
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}
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}
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AlrExperimentSettings settings;
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if (sscanf(group_name.c_str(), "%f,%" PRId64 ",%d,%d,%d,%d",
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&settings.pacing_factor, &settings.max_paced_queue_time,
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&settings.alr_bandwidth_usage_percent,
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&settings.alr_start_budget_level_percent,
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&settings.alr_stop_budget_level_percent,
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&settings.group_id) == 6) {
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ret.emplace(settings);
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RTC_LOG(LS_INFO) << "Using ALR experiment settings: "
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"pacing factor: "
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<< settings.pacing_factor << ", max pacer queue length: "
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<< settings.max_paced_queue_time
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<< ", ALR bandwidth usage percent: "
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<< settings.alr_bandwidth_usage_percent
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<< ", ALR start budget level percent: "
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<< settings.alr_start_budget_level_percent
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<< ", ALR end budget level percent: "
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<< settings.alr_stop_budget_level_percent
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<< ", ALR experiment group ID: " << settings.group_id;
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} else {
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RTC_LOG(LS_INFO) << "Failed to parse ALR experiment: " << experiment_name;
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}
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return ret;
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}
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} // namespace webrtc
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