65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
/*
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* Copyright 2003-2017 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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#include "config.h"
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#include "Timer.hxx"
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#include "AudioFormat.hxx"
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#include <limits>
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#include <assert.h>
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Timer::Timer(const AudioFormat af)
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:rate(af.sample_rate * af.GetFrameSize())
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{
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}
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void Timer::Start()
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{
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time = Now();
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started = true;
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}
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void Timer::Reset()
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{
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started = false;
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}
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void
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Timer::Add(size_t size)
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{
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assert(started);
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// (size samples) / (rate samples per second) = duration seconds
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// duration seconds * 1000000 = duration us
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time += Time(((uint64_t)size * Time::period::den) / (Time::period::num * rate));
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}
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std::chrono::steady_clock::duration
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Timer::GetDelay() const
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{
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assert(started);
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const auto delay = time - Now();
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if (delay < Time::zero())
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return Time::zero();
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return std::chrono::duration_cast<std::chrono::steady_clock::duration>(delay);
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}
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