gstreamer/gst/gstclock.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstclock.c: Clock subsystem for maintaining time sync
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <sys/time.h>
//#define GST_DEBUG_ENABLED
#include "gst_private.h"
#include "gstelement.h"
#include "gstclock.h"
static GstClock *the_system_clock = NULL;
/**
* gst_clock_new:
* @name: the name of the new clock
*
* create a new clock element
*
* Returns: the new clock element
*/
GstClock*
gst_clock_new (gchar *name)
{
GstClock *clock = (GstClock *) g_malloc(sizeof(GstClock));
clock->name = g_strdup (name);
clock->sinkobjects = NULL;
clock->sinkmutex = g_mutex_new ();
clock->lock = g_mutex_new ();
g_mutex_lock (clock->sinkmutex);
clock->num = 0;
clock->num_locked = 0;
clock->locking = FALSE;
return clock;
}
GstClock*
gst_clock_get_system(void)
{
if (the_system_clock == NULL) {
the_system_clock = gst_clock_new ("system_clock");
gst_clock_reset (the_system_clock);
}
return the_system_clock;
}
void
gst_clock_register (GstClock *clock, GstObject *obj)
{
if ((GST_ELEMENT(obj))->numsrcpads == 0) {
GST_DEBUG (0,"gst_clock: setting registered sink object 0x%p\n", obj);
clock->sinkobjects = g_list_append (clock->sinkobjects, obj);
clock->num++;
}
}
void
gst_clock_set (GstClock *clock, GstClockTime time)
{
struct timeval tfnow;
GstClockTime now;
gettimeofday (&tfnow, (struct timezone *)NULL);
now = tfnow.tv_sec*1000000LL+tfnow.tv_usec;
g_mutex_lock (clock->lock);
clock->start_time = now - time;
g_mutex_unlock (clock->lock);
GST_DEBUG (0,"gst_clock: setting clock to %llu %llu %llu\n", time, now, clock->start_time);
}
GstClockTimeDiff
gst_clock_current_diff (GstClock *clock, GstClockTime time)
{
struct timeval tfnow;
GstClockTime now;
gettimeofday (&tfnow, (struct timezone *)NULL);
g_mutex_lock (clock->lock);
now = ((guint64)tfnow.tv_sec*1000000LL+tfnow.tv_usec) - (guint64)clock->start_time;
g_mutex_unlock (clock->lock);
return GST_CLOCK_DIFF (time, now);
}
void
gst_clock_reset (GstClock *clock)
{
struct timeval tfnow;
gettimeofday (&tfnow, (struct timezone *)NULL);
g_mutex_lock (clock->lock);
clock->start_time = ((guint64)tfnow.tv_sec)*1000000LL+tfnow.tv_usec;
clock->current_time = clock->start_time;
clock->adjust = 0LL;
GST_DEBUG (0,"gst_clock: setting start clock %llu\n", clock->start_time);
g_mutex_unlock (clock->lock);
}
void
gst_clock_wait (GstClock *clock, GstClockTime time, GstObject *obj)
{
struct timeval tfnow;
GstClockTime now;
GstClockTimeDiff diff;
gettimeofday (&tfnow, (struct timezone *)NULL);
g_mutex_lock (clock->lock);
now = tfnow.tv_sec*1000000LL+tfnow.tv_usec - clock->start_time;
diff = GST_CLOCK_DIFF (time, now);
// if we are not behind wait a bit
GST_DEBUG (0,"gst_clock: %s waiting for time %08llu %08llu %08lld\n", gst_element_get_name(GST_ELEMENT(obj)), time, now, diff);
g_mutex_unlock (clock->lock);
if (diff > 10000 ) {
tfnow.tv_usec = (diff % 1000000);
tfnow.tv_sec = diff / 1000000;
// FIXME, this piece of code does not work with egcs optimisations on, had to use the following line
if (!tfnow.tv_sec) {
select(0, NULL, NULL, NULL, &tfnow);
}
else GST_DEBUG (0,"gst_clock: %s waiting %u %llu %llu %llu seconds\n", gst_element_get_name(GST_ELEMENT(obj)),
(int)tfnow.tv_sec, now, diff, time);
}
GST_DEBUG (0,"gst_clock: %s waiting for time %08llu %08llu %08lld done \n", gst_element_get_name(GST_ELEMENT(obj)), time, now, diff);
}