mpd/src/output/Timer.hxx

/*
 * Copyright 2003-2016 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef MPD_TIMER_HXX
#define MPD_TIMER_HXX

#include <chrono>

struct AudioFormat;

class Timer {
	typedef std::chrono::microseconds Time;

	Time time;
	bool started = false;
	const int rate;
public:
	explicit Timer(AudioFormat af);

	bool IsStarted() const { return started; }

	void Start();
	void Reset();

	void Add(size_t size);

	/**
	 * Returns the duration to sleep to get back to sync.
	 */
	std::chrono::steady_clock::duration GetDelay() const;

private:
	static Time Now() {
		return std::chrono::duration_cast<Time>(std::chrono::steady_clock::now().time_since_epoch());
	}
};

#endif