67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
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/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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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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#include <cstdint>
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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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typedef Base::rep rep;
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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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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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constexpr rep ToMS() const {
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return count();
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}
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constexpr unsigned ToScale(unsigned base) const {
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// TODO: case to 64 bit to avoid integer overflow?
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return count() * base / 1000;
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}
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};
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#endif
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