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/*
* Copyright (C) 2003-2011 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.h"
#include "audio_format.h"
#include "clock.h"
#include <glib.h>
#include <assert.h>
#include <limits.h>
#include <stddef.h>
struct timer *timer_new(const struct audio_format *af)
{
struct timer *timer = g_new(struct timer, 1);
timer->time = 0; // us
timer->started = 0; // false
timer->rate = af->sample_rate * audio_format_frame_size(af); // samples per second
return timer;
}
void timer_free(struct timer *timer)
{
g_free(timer);
}
void timer_start(struct timer *timer)
{
timer->time = monotonic_clock_us();
timer->started = 1;
}
void timer_reset(struct timer *timer)
{
timer->time = 0;
timer->started = 0;
}
void timer_add(struct timer *timer, int size)
{
assert(timer->started);
// (size samples) / (rate samples per second) = duration seconds
// duration seconds * 1000000 = duration us
timer->time += ((uint64_t)size * 1000000) / timer->rate;
}
unsigned
timer_delay(const struct timer *timer)
{
int64_t delay = (int64_t)(timer->time - monotonic_clock_us()) / 1000;
if (delay < 0)
return 0;
if (delay > G_MAXINT)
delay = G_MAXINT;
return delay;
}
void timer_sync(struct timer *timer)
{
int64_t sleep_duration;
assert(timer->started);
sleep_duration = timer->time - monotonic_clock_us();
if (sleep_duration > 0)
g_usleep(sleep_duration);
}
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