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/*
* 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 <inttypes.h>
#include <stdio.h>
#include <string>
#include "absl/strings/string_view.h"
#include "api/field_trials_view.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace {
constexpr absl::string_view kDefaultProbingScreenshareBweSettings =
"1.0,2875,80,40,-60,3";
} // namespace
bool AlrExperimentSettings::MaxOneFieldTrialEnabled(
const FieldTrialsView& key_value_config) {
return key_value_config.Lookup(kStrictPacingAndProbingExperimentName)
.empty() ||
key_value_config.Lookup(kScreenshareProbingBweExperimentName).empty();
}
absl::optional<AlrExperimentSettings>
AlrExperimentSettings::CreateFromFieldTrial(
const FieldTrialsView& key_value_config,
absl::string_view experiment_name) {
absl::optional<AlrExperimentSettings> ret;
std::string group_name = key_value_config.Lookup(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 (group_name.empty()) {
if (experiment_name == kScreenshareProbingBweExperimentName) {
// This experiment is now default-on with fixed settings.
// TODO(sprang): Remove this kill-switch and clean up experiment code.
group_name = kDefaultProbingScreenshareBweSettings;
} else {
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 bandwidth usage percent: "
<< settings.alr_bandwidth_usage_percent
<< ", ALR start 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
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