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91 lines
2.5 KiB
C++
91 lines
2.5 KiB
C++
/***
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This file is part of snapcast
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Copyright (C) 2014-2023 Johannes Pohl
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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 3 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#pragma once
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// local headers
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#include "common/message/message.hpp"
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#include "common/time_defs.hpp"
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#include "double_buffer.hpp"
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// 3rd party headers
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// standard headers
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#include <atomic>
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#include <chrono>
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/// Provides local and server time
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/**
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* Stores time difference to the server
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* Returns server's local system time.
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* Clients are using the server time to play audio in sync, independent of the client's system time
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*/
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class TimeProvider
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{
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public:
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static TimeProvider& getInstance()
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{
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static TimeProvider instance;
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return instance;
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}
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void setDiffToServer(double ms);
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void setDiff(const tv& c2s, const tv& s2c);
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template <typename T>
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inline T getDiffToServer() const
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{
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return std::chrono::duration_cast<T>(chronos::usec(diffToServer_));
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}
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/* chronos::usec::rep getDiffToServer();
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chronos::usec::rep getPercentileDiffToServer(size_t percentile);
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long getDiffToServerMs();
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*/
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template <typename T>
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static T sinceEpoche(const chronos::time_point_clk& point)
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{
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return std::chrono::duration_cast<T>(point.time_since_epoch());
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}
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static chronos::time_point_clk toTimePoint(const tv& timeval)
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{
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return chronos::time_point_clk(chronos::usec(timeval.usec) + chronos::sec(timeval.sec));
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}
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inline static chronos::time_point_clk now()
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{
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return chronos::clk::now();
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}
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inline static chronos::time_point_clk serverNow()
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{
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return chronos::clk::now() + TimeProvider::getInstance().getDiffToServer<chronos::usec>();
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}
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private:
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TimeProvider();
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TimeProvider(TimeProvider const&); // Don't Implement
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void operator=(TimeProvider const&); // Don't implement
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DoubleBuffer<chronos::usec::rep> diffBuffer_;
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std::atomic<chronos::usec::rep> diffToServer_;
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};
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