2014-08-26 21:52:28 +02:00
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/*
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2020-01-18 19:22:19 +01:00
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* Copyright 2003-2020 The Music Player Daemon Project
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2014-08-26 21:52:28 +02:00
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_CHRONO_HXX
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#define MPD_CHRONO_HXX
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#include <chrono>
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2014-08-28 07:12:58 +02:00
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#include <utility>
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2014-08-26 21:52:28 +02:00
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#include <cstdint>
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2018-09-21 20:42:30 +02:00
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using FloatDuration = std::chrono::duration<double>;
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2014-08-26 21:52:28 +02:00
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/**
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* A time stamp within a song. Granularity is 1 millisecond and the
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* maximum value is about 49 days.
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*/
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class SongTime : public std::chrono::duration<std::uint32_t, std::milli> {
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typedef std::chrono::duration<std::uint32_t, std::milli> Base;
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public:
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SongTime() = default;
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template<typename T>
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explicit constexpr SongTime(T t):Base(t) {}
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2014-08-28 07:12:58 +02:00
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static constexpr SongTime zero() {
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return SongTime(Base::zero());
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}
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2014-08-27 18:47:05 +02:00
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2018-09-21 20:18:22 +02:00
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template<typename D>
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static constexpr SongTime Cast(D src) {
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return SongTime(std::chrono::duration_cast<Base>(src));
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}
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2014-08-26 21:52:28 +02:00
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static constexpr SongTime FromS(unsigned s) {
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return SongTime(rep(s) * 1000);
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}
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static constexpr SongTime FromS(float s) {
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return SongTime(rep(s * 1000));
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}
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static constexpr SongTime FromS(double s) {
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return SongTime(rep(s * 1000));
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}
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static constexpr SongTime FromMS(rep ms) {
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return SongTime(ms);
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}
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2014-08-29 12:22:25 +02:00
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constexpr rep ToS() const {
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return count() / rep(1000);
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}
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constexpr rep RoundS() const {
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return (count() + 500) / rep(1000);
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}
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2014-08-26 21:52:28 +02:00
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constexpr rep ToMS() const {
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return count();
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}
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2014-08-27 18:41:28 +02:00
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template<typename T=rep>
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2014-08-29 20:57:44 +02:00
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constexpr T ToScale(unsigned scale) const {
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return count() * T(scale) / 1000;
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2014-08-26 21:52:28 +02:00
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}
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2014-08-27 18:39:39 +02:00
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2014-08-29 20:57:25 +02:00
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/**
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* Convert a scalar value with the given scale to a #SongTime
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* instance.
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*
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* @param value the input value
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* @param scale the value's scale in Hz
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*/
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template<typename T=rep>
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static constexpr SongTime FromScale(T value, unsigned scale) {
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return SongTime(value * T(1000) / T(scale));
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}
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2014-08-27 18:39:39 +02:00
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constexpr double ToDoubleS() const {
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return double(count()) / 1000.;
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2020-03-16 06:39:56 +01:00
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}
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2014-08-28 06:42:00 +02:00
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constexpr bool IsZero() const {
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return count() == 0;
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}
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constexpr bool IsPositive() const {
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return count() > 0;
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}
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2014-08-28 07:12:58 +02:00
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2016-11-18 08:41:47 +01:00
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constexpr SongTime operator+(const SongTime &other) const {
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2014-08-28 07:12:58 +02:00
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return SongTime(*(const Base *)this + (const Base &)other);
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}
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2016-11-18 08:41:47 +01:00
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constexpr SongTime operator-(const SongTime &other) const {
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2014-08-28 07:12:58 +02:00
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return SongTime(*(const Base *)this - (const Base &)other);
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}
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2014-08-26 21:52:28 +02:00
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};
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2014-08-28 06:28:14 +02:00
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/**
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* A variant of #SongTime that is based on a signed integer. It can
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* be used for relative values.
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*/
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class SignedSongTime : public std::chrono::duration<std::int32_t, std::milli> {
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typedef std::chrono::duration<std::int32_t, std::milli> Base;
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public:
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SignedSongTime() = default;
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template<typename T>
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explicit constexpr SignedSongTime(T t):Base(t) {}
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2014-08-29 13:20:45 +02:00
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/**
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* Allow implicit conversion from SongTime to SignedSongTime.
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*/
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constexpr SignedSongTime(SongTime t):Base(t) {}
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2014-08-28 07:12:58 +02:00
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static constexpr SignedSongTime zero() {
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return SignedSongTime(Base::zero());
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}
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2014-08-28 06:28:14 +02:00
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2014-08-29 12:17:23 +02:00
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/**
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* Generate a negative value.
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*/
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static constexpr SignedSongTime Negative() {
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return SignedSongTime(-1);
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}
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2018-09-21 20:18:22 +02:00
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template<typename D>
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static constexpr SongTime Cast(D src) {
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return SongTime(std::chrono::duration_cast<Base>(src));
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}
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2014-08-28 06:28:14 +02:00
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static constexpr SignedSongTime FromS(int s) {
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return SignedSongTime(rep(s) * 1000);
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}
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2014-08-29 12:34:31 +02:00
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static constexpr SignedSongTime FromS(unsigned s) {
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return SignedSongTime(rep(s) * 1000);
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}
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2014-08-28 06:28:14 +02:00
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static constexpr SignedSongTime FromS(float s) {
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return SignedSongTime(rep(s * 1000));
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}
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static constexpr SignedSongTime FromS(double s) {
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return SignedSongTime(rep(s * 1000));
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}
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static constexpr SignedSongTime FromMS(rep ms) {
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return SignedSongTime(ms);
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}
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2014-08-29 12:22:25 +02:00
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constexpr rep ToS() const {
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return count() / rep(1000);
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}
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constexpr rep RoundS() const {
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return (count() + 500) / rep(1000);
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}
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2014-08-28 06:28:14 +02:00
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constexpr rep ToMS() const {
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return count();
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}
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template<typename T=rep>
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2014-08-29 20:57:44 +02:00
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constexpr T ToScale(unsigned scale) const {
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return count() * T(scale) / 1000;
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2014-08-28 06:28:14 +02:00
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}
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2014-08-29 20:57:25 +02:00
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/**
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* Convert a scalar value with the given scale to a
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* #SignedSongTime instance.
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*
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* @param value the input value
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* @param scale the value's scale in Hz
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*/
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template<typename T=rep>
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static constexpr SignedSongTime FromScale(T value, unsigned scale) {
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return SignedSongTime(value * T(1000) / T(scale));
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}
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2014-08-28 06:28:14 +02:00
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constexpr double ToDoubleS() const {
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return double(count()) / 1000.;
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2020-03-16 06:39:56 +01:00
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}
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2014-08-28 06:28:14 +02:00
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constexpr bool IsZero() const {
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return count() == 0;
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}
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constexpr bool IsPositive() const {
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return count() > 0;
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}
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constexpr bool IsNegative() const {
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return count() < 0;
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}
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2014-08-28 07:12:58 +02:00
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2016-11-18 08:41:47 +01:00
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constexpr SignedSongTime operator+(const SignedSongTime &other) const {
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2014-08-28 07:12:58 +02:00
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return SignedSongTime(*(const Base *)this + (const Base &)other);
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}
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2016-11-18 08:41:47 +01:00
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constexpr SignedSongTime operator-(const SignedSongTime &other) const {
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2014-08-28 07:12:58 +02:00
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return SignedSongTime(*(const Base *)this - (const Base &)other);
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}
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2014-08-28 06:28:14 +02:00
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};
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2014-08-26 21:52:28 +02:00
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#endif
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