68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
/*
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* Copyright (C) 2003-2015 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 "system/Clock.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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: time(0),
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started(false),
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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 = MonotonicClockUS();
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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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time = 0;
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started = false;
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}
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void Timer::Add(int 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 += ((uint64_t)size * 1000000) / rate;
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}
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unsigned Timer::GetDelay() const
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{
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int64_t delay = (int64_t)(time - MonotonicClockUS()) / 1000;
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if (delay < 0)
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return 0;
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if (delay > std::numeric_limits<int>::max())
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delay = std::numeric_limits<int>::max();
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return delay;
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}
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