102 lines
3.2 KiB
C
102 lines
3.2 KiB
C
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/*
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* Copyright (c) 2019 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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#ifndef API_UNITS_FREQUENCY_H_
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#define API_UNITS_FREQUENCY_H_
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#ifdef WEBRTC_UNIT_TEST
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#include <ostream> // no-presubmit-check TODO(webrtc:8982)
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#endif // WEBRTC_UNIT_TEST
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#include <cstdlib>
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#include <limits>
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#include <string>
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#include <type_traits>
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#include "api/units/time_delta.h"
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#include "rtc_base/units/unit_base.h"
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namespace webrtc {
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class Frequency final : public rtc_units_impl::RelativeUnit<Frequency> {
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public:
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template <typename T>
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static constexpr Frequency MilliHertz(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromValue(value);
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}
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template <typename T>
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static constexpr Frequency Hertz(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromFraction(1'000, value);
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}
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template <typename T>
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static constexpr Frequency KiloHertz(T value) {
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static_assert(std::is_arithmetic<T>::value, "");
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return FromFraction(1'000'000, value);
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}
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Frequency() = delete;
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template <typename T = int64_t>
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constexpr T hertz() const {
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return ToFraction<1000, T>();
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}
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template <typename T = int64_t>
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constexpr T millihertz() const {
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return ToValue<T>();
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}
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private:
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friend class rtc_units_impl::UnitBase<Frequency>;
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using RelativeUnit::RelativeUnit;
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static constexpr bool one_sided = true;
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};
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inline constexpr Frequency operator/(int64_t nominator,
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const TimeDelta& interval) {
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constexpr int64_t kKiloPerMicro = 1000 * 1000000;
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RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kKiloPerMicro);
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RTC_CHECK(interval.IsFinite());
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RTC_CHECK(!interval.IsZero());
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return Frequency::MilliHertz(nominator * kKiloPerMicro / interval.us());
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}
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inline constexpr TimeDelta operator/(int64_t nominator,
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const Frequency& frequency) {
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constexpr int64_t kMegaPerMilli = 1000000 * 1000;
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RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kMegaPerMilli);
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RTC_CHECK(frequency.IsFinite());
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RTC_CHECK(!frequency.IsZero());
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return TimeDelta::Micros(nominator * kMegaPerMilli / frequency.millihertz());
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}
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inline constexpr double operator*(Frequency frequency, TimeDelta time_delta) {
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return frequency.hertz<double>() * time_delta.seconds<double>();
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}
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inline constexpr double operator*(TimeDelta time_delta, Frequency frequency) {
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return frequency * time_delta;
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}
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std::string ToString(Frequency value);
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inline std::string ToLogString(Frequency value) {
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return ToString(value);
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}
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#ifdef WEBRTC_UNIT_TEST
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inline std::ostream& operator<<( // no-presubmit-check TODO(webrtc:8982)
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std::ostream& stream, // no-presubmit-check TODO(webrtc:8982)
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Frequency value) {
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return stream << ToString(value);
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}
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#endif // WEBRTC_UNIT_TEST
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} // namespace webrtc
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#endif // API_UNITS_FREQUENCY_H_
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