blob: dff5acecc8b7566a08c1569ee70ff1508e267444 [file] [log] [blame]
/*
* 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 "rtc_base/experiments/alr_experiment.h"
#include <string>
#include "rtc_base/format_macros.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
const char AlrExperimentSettings::kScreenshareProbingBweExperimentName[] =
"WebRTC-ProbingScreenshareBwe";
const char AlrExperimentSettings::kStrictPacingAndProbingExperimentName[] =
"WebRTC-StrictPacingAndProbing";
const char kDefaultProbingScreenshareBweSettings[] = "1.0,2875,80,40,-60,3";
bool AlrExperimentSettings::MaxOneFieldTrialEnabled() {
return field_trial::FindFullName(kStrictPacingAndProbingExperimentName)
.empty() ||
field_trial::FindFullName(kScreenshareProbingBweExperimentName)
.empty();
}
absl::optional<AlrExperimentSettings>
AlrExperimentSettings::CreateFromFieldTrial(const char* experiment_name) {
absl::optional<AlrExperimentSettings> ret;
std::string group_name = field_trial::FindFullName(experiment_name);
const std::string kIgnoredSuffix = "_Dogfood";
std::string::size_type suffix_pos = group_name.rfind(kIgnoredSuffix);
if (suffix_pos != std::string::npos &&
suffix_pos == group_name.length() - kIgnoredSuffix.length()) {
group_name.resize(group_name.length() - kIgnoredSuffix.length());
}
if (experiment_name == kScreenshareProbingBweExperimentName) {
// This experiment is now default-on with fixed settings.
// TODO(sprang): Remove this kill-switch and clean up experiment code.
if (group_name != "Disabled") {
group_name = kDefaultProbingScreenshareBweSettings;
}
}
if (group_name.empty())
return ret;
AlrExperimentSettings settings;
if (sscanf(group_name.c_str(), "%f,%" PRId64 ",%d,%d,%d,%d",
&settings.pacing_factor, &settings.max_paced_queue_time,
&settings.alr_bandwidth_usage_percent,
&settings.alr_start_budget_level_percent,
&settings.alr_stop_budget_level_percent,
&settings.group_id) == 6) {
ret.emplace(settings);
RTC_LOG(LS_INFO) << "Using ALR experiment settings: "
"pacing factor: "
<< settings.pacing_factor << ", max pacer queue length: "
<< settings.max_paced_queue_time
<< ", ALR start bandwidth usage percent: "
<< settings.alr_bandwidth_usage_percent
<< ", ALR end budget level percent: "
<< settings.alr_start_budget_level_percent
<< ", ALR end budget level percent: "
<< settings.alr_stop_budget_level_percent
<< ", ALR experiment group ID: " << settings.group_id;
} else {
RTC_LOG(LS_INFO) << "Failed to parse ALR experiment: " << experiment_name;
}
return ret;
}
} // namespace webrtc