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