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/*
* Copyright (c) 2019 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.
*/
#ifndef API_UNITS_FREQUENCY_H_
#define API_UNITS_FREQUENCY_H_
#include <cstdint>
#include <cstdlib>
#include <limits>
#include <string>
#include <type_traits>
#include "api/units/time_delta.h"
#include "rtc_base/checks.h"
#include "rtc_base/system/rtc_export.h"
#include "rtc_base/units/unit_base.h" // IWYU pragma: export
namespace webrtc {
class Frequency final : public rtc_units_impl::RelativeUnit<Frequency> {
public:
template <typename T>
static constexpr Frequency MilliHertz(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromValue(value);
}
template <typename T>
static constexpr Frequency Hertz(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromFraction(1'000, value);
}
template <typename T>
static constexpr Frequency KiloHertz(T value) {
static_assert(std::is_arithmetic<T>::value, "");
return FromFraction(1'000'000, value);
}
constexpr Frequency() = default;
template <typename Sink>
friend void AbslStringify(Sink& sink, Frequency value);
template <typename T = int64_t>
constexpr T hertz() const {
return ToFraction<1000, T>();
}
template <typename T = int64_t>
constexpr T millihertz() const {
return ToValue<T>();
}
private:
friend class rtc_units_impl::UnitBase<Frequency>;
using RelativeUnit::RelativeUnit;
static constexpr bool one_sided = true;
};
inline constexpr Frequency operator/(int64_t nominator,
const TimeDelta& interval) {
constexpr int64_t kKiloPerMicro = 1000 * 1000000;
RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kKiloPerMicro);
RTC_CHECK(interval.IsFinite());
RTC_CHECK(!interval.IsZero());
return Frequency::MilliHertz(nominator * kKiloPerMicro / interval.us());
}
inline constexpr TimeDelta operator/(int64_t nominator,
const Frequency& frequency) {
constexpr int64_t kMegaPerMilli = 1000000 * 1000;
RTC_DCHECK_LE(nominator, std::numeric_limits<int64_t>::max() / kMegaPerMilli);
RTC_CHECK(frequency.IsFinite());
RTC_CHECK(!frequency.IsZero());
return TimeDelta::Micros(nominator * kMegaPerMilli / frequency.millihertz());
}
inline constexpr double operator*(Frequency frequency, TimeDelta time_delta) {
return frequency.hertz<double>() * time_delta.seconds<double>();
}
inline constexpr double operator*(TimeDelta time_delta, Frequency frequency) {
return frequency * time_delta;
}
RTC_EXPORT std::string ToString(Frequency value);
template <typename Sink>
void AbslStringify(Sink& sink, Frequency value) {
sink.Append(ToString(value));
}
} // namespace webrtc
#endif // API_UNITS_FREQUENCY_H_
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