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