blob: f53978b21153d4fd5024e1c99564d57ebf91adf7 [file] [log] [blame]
/*
* 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/field_trial_units.h"
#include <limits>
#include <string>
#include "absl/types/optional.h"
// Large enough to fit "seconds", the longest supported unit name.
#define RTC_TRIAL_UNIT_LENGTH_STR "7"
#define RTC_TRIAL_UNIT_SIZE 8
namespace webrtc {
namespace {
struct ValueWithUnit {
double value;
std::string unit;
};
absl::optional<ValueWithUnit> ParseValueWithUnit(std::string str) {
if (str == "inf") {
return ValueWithUnit{std::numeric_limits<double>::infinity(), ""};
} else if (str == "-inf") {
return ValueWithUnit{-std::numeric_limits<double>::infinity(), ""};
} else {
double double_val;
char unit_char[RTC_TRIAL_UNIT_SIZE];
unit_char[0] = 0;
if (sscanf(str.c_str(), "%lf%" RTC_TRIAL_UNIT_LENGTH_STR "s", &double_val,
unit_char) >= 1) {
return ValueWithUnit{double_val, unit_char};
}
}
return absl::nullopt;
}
} // namespace
template <>
absl::optional<DataRate> ParseTypedParameter<DataRate>(std::string str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit.empty() || result->unit == "kbps") {
return DataRate::kbps(result->value);
} else if (result->unit == "bps") {
return DataRate::bps(result->value);
}
}
return absl::nullopt;
}
template <>
absl::optional<DataSize> ParseTypedParameter<DataSize>(std::string str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit.empty() || result->unit == "bytes")
return DataSize::bytes(result->value);
}
return absl::nullopt;
}
template <>
absl::optional<TimeDelta> ParseTypedParameter<TimeDelta>(std::string str) {
absl::optional<ValueWithUnit> result = ParseValueWithUnit(str);
if (result) {
if (result->unit == "s" || result->unit == "seconds") {
return TimeDelta::seconds(result->value);
} else if (result->unit == "us") {
return TimeDelta::us(result->value);
} else if (result->unit.empty() || result->unit == "ms") {
return TimeDelta::ms(result->value);
}
}
return absl::nullopt;
}
template class FieldTrialParameter<DataRate>;
template class FieldTrialParameter<DataSize>;
template class FieldTrialParameter<TimeDelta>;
template class FieldTrialOptional<DataRate>;
template class FieldTrialOptional<DataSize>;
template class FieldTrialOptional<TimeDelta>;
} // namespace webrtc