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/*
* tctimer.c -- simple timer code implementation for transcode.
* (C) 2006-2010 - Francesco Romani <fromani -at- gmail -dot- com>
*
* This file is part of transcode, a video stream processing tool.
*
* transcode 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.
*
* transcode 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#ifndef HAVE_GETTIMEOFDAY
# error "this module REQUIRES gettimeofday presence!"
#endif
#include <sys/time.h>
#include <time.h>
#include <errno.h>
#include "tctimer.h"
#include "libtc.h"
/*
* Internal time representation:
* XXX WRITEME
*/
/*************************************************************************/
/* utilities */
static uint64_t tc_timeval_to_microsecs(const struct timeval *tv)
{
return (tv->tv_sec * 1000000 + tv->tv_usec);
}
uint64_t tc_gettime(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return tc_timeval_to_microsecs(&tv);
}
/*************************************************************************/
/* generics */
/*************************************************************************/
static uint64_t tc_timer_generic_elapsed(TCTimer *timer)
{
uint64_t r = 0, t = tc_gettime();
r = t - timer->last_time;
timer->last_time = t;
return r;
}
/*************************************************************************/
/* timer-specific code */
/*************************************************************************/
static int tc_timer_soft_fini(TCTimer *timer)
{
return 0; /* no internal state -> nothing to finalize */
}
static int tc_timer_soft_sleep(TCTimer *timer, uint64_t amount)
{
struct timespec ts, tr;
int ret;
ts.tv_sec = amount / 1000000;
ts.tv_nsec = (amount % 1000000) * 1000;
do {
ret = nanosleep(&ts, &tr);
if (ret == -1) {
if (errno != EINTR) {
/* report fault */
break;
} else {
/* reload */
ts.tv_sec = tr.tv_sec;
ts.tv_nsec = tr.tv_nsec;
}
}
} while (ret != 0);
return ret;
}
/*************************************************************************/
/* entry points */
/*************************************************************************/
int tc_timer_init_soft(TCTimer *timer, uint16_t frequency)
{
int ret = -1;
if (timer != NULL) {
/* frequency: ignored, we relies on nanosleep() */
timer->last_time = tc_gettime();
timer->elapsed = tc_timer_generic_elapsed;
timer->sleep = tc_timer_soft_sleep;
timer->fini = tc_timer_soft_fini;
ret = 0;
}
return ret;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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