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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 "rtc_base/experiments/rtt_mult_experiment.h"
#include <stdio.h>
#include <algorithm>
#include <string>
#include "rtc_base/logging.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
namespace {
const char kRttMultExperiment[] = "WebRTC-RttMult";
const float max_rtt_mult_setting = 1.0;
const float min_rtt_mult_setting = 0.0;
const float max_rtt_mult_add_cap_ms = 2000.0;
const float min_rtt_mult_add_cap_ms = 0.0;
} // namespace
bool RttMultExperiment::RttMultEnabled() {
return field_trial::IsEnabled(kRttMultExperiment);
}
absl::optional<RttMultExperiment::Settings>
RttMultExperiment::GetRttMultValue() {
if (!RttMultExperiment::RttMultEnabled())
return absl::nullopt;
const std::string group =
webrtc::field_trial::FindFullName(kRttMultExperiment);
if (group.empty()) {
RTC_LOG(LS_WARNING) << "Could not find rtt_mult_experiment.";
return absl::nullopt;
}
Settings s;
if (sscanf(group.c_str(), "Enabled-%f,%f", &s.rtt_mult_setting,
&s.rtt_mult_add_cap_ms) != 2) {
RTC_LOG(LS_WARNING) << "Invalid number of parameters provided.";
return absl::nullopt;
}
// Bounds check rtt_mult_setting and rtt_mult_add_cap_ms values.
s.rtt_mult_setting = std::min(s.rtt_mult_setting, max_rtt_mult_setting);
s.rtt_mult_setting = std::max(s.rtt_mult_setting, min_rtt_mult_setting);
s.rtt_mult_add_cap_ms =
std::min(s.rtt_mult_add_cap_ms, max_rtt_mult_add_cap_ms);
s.rtt_mult_add_cap_ms =
std::max(s.rtt_mult_add_cap_ms, min_rtt_mult_add_cap_ms);
RTC_LOG(LS_INFO) << "rtt_mult experiment: rtt_mult value = "
<< s.rtt_mult_setting
<< " rtt_mult addition cap = " << s.rtt_mult_add_cap_ms
<< " ms.";
return s;
}
} // namespace webrtc
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