/* * Copyright (C) 2003-2014 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. */ #include "config.h" #include "Timer.hxx" #include "AudioFormat.hxx" #include "system/Clock.hxx" #include <limits> #include <assert.h> Timer::Timer(const AudioFormat af) : time(0), started(false), rate(af.sample_rate * af.GetFrameSize()) { } void Timer::Start() { time = MonotonicClockUS(); started = true; } void Timer::Reset() { time = 0; started = false; } void Timer::Add(int size) { assert(started); // (size samples) / (rate samples per second) = duration seconds // duration seconds * 1000000 = duration us time += ((uint64_t)size * 1000000) / rate; } unsigned Timer::GetDelay() const { int64_t delay = (int64_t)(time - MonotonicClockUS()) / 1000; if (delay < 0) return 0; if (delay > std::numeric_limits<int>::max()) delay = std::numeric_limits<int>::max(); return delay; }