gstreamer/gst/gstsystemclock.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@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 "gstsystemclock.h"
#define CLASS(clock) GST_SYSTEM_CLOCK_CLASS (G_OBJECT_GET_CLASS (clock))
static GstClock *_the_system_clock = NULL;
static void gst_system_clock_class_init (GstSystemClockClass *klass);
static void gst_system_clock_init (GstSystemClock *clock);
static void gst_system_clock_activate (GstClock *clock, gboolean active);
static void gst_system_clock_reset (GstClock *clock);
static void gst_system_clock_set_time (GstClock *clock, GstClockTime time);
static GstClockTime gst_system_clock_get_time (GstClock *clock);
static GstClockReturn gst_system_clock_wait (GstClock *clock, GstClockTime time);
static guint64 gst_system_clock_get_resolution (GstClock *clock);
static GstClockClass *parent_class = NULL;
/* static guint gst_system_clock_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_system_clock_get_type (void)
{
static GType clock_type = 0;
if (!clock_type) {
static const GTypeInfo clock_info = {
sizeof (GstSystemClockClass),
NULL,
NULL,
(GClassInitFunc) gst_system_clock_class_init,
NULL,
NULL,
sizeof (GstSystemClock),
4,
(GInstanceInitFunc) gst_system_clock_init,
NULL
};
clock_type = g_type_register_static (GST_TYPE_CLOCK, "GstSystemClock",
&clock_info, 0);
}
return clock_type;
}
static void
gst_system_clock_class_init (GstSystemClockClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstClockClass *gstclock_class;
gobject_class = (GObjectClass*) klass;
gstobject_class = (GstObjectClass*) klass;
gstclock_class = (GstClockClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_CLOCK);
gstclock_class->activate = gst_system_clock_activate;
gstclock_class->reset = gst_system_clock_reset;
gstclock_class->set_time = gst_system_clock_set_time;
gstclock_class->get_time = gst_system_clock_get_time;
gstclock_class->wait = gst_system_clock_wait;
gstclock_class->get_resolution = gst_system_clock_get_resolution;
}
static void
gst_system_clock_init (GstSystemClock *clock)
{
}
GstClock*
gst_system_clock_obtain (void)
{
if (_the_system_clock == NULL) {
_the_system_clock = GST_CLOCK (g_object_new (GST_TYPE_SYSTEM_CLOCK, NULL));
gst_object_set_name (GST_OBJECT (_the_system_clock), "GstSystemClock");
}
return _the_system_clock;
}
static void
gst_system_clock_activate (GstClock *clock, gboolean active)
{
GTimeVal timeval;
GstSystemClock *sys_clock = GST_SYSTEM_CLOCK (clock);
g_get_current_time (&timeval);
GST_LOCK (clock);
if (active) {
sys_clock->absolute_start = GST_TIMEVAL_TO_TIME (timeval) - sys_clock->current_time;;
}
else {
sys_clock->current_time = GST_TIMEVAL_TO_TIME (timeval) - sys_clock->absolute_start;
}
GST_UNLOCK (clock);
}
static void
gst_system_clock_set_time (GstClock *clock, GstClockTime time)
{
GTimeVal timeval;
GstSystemClock *sys_clock = GST_SYSTEM_CLOCK (clock);
g_get_current_time (&timeval);
GST_LOCK (clock);
sys_clock->absolute_start = GST_TIMEVAL_TO_TIME (timeval) - time;
sys_clock->current_time = time;
GST_UNLOCK (clock);
}
static void
gst_system_clock_reset (GstClock *clock)
{
gst_system_clock_set_time (clock, 0LL);
}
static GstClockTime
gst_system_clock_get_time (GstClock *clock)
{
GstSystemClock *sys_clock = GST_SYSTEM_CLOCK (clock);
GstClockTime res;
if (!clock->active) {
GST_LOCK (clock);
res = sys_clock->current_time;
}
else {
GTimeVal timeval;
g_get_current_time (&timeval);
GST_LOCK (clock);
res = GST_TIMEVAL_TO_TIME (timeval) - sys_clock->absolute_start;
}
GST_UNLOCK (clock);
return res;
}
static GstClockReturn
gst_system_clock_wait (GstClock *clock, GstClockTime time)
{
GstClockTime target;
GTimeVal timeval;
GCond *cond = g_cond_new ();
GstSystemClock *sys_clock = GST_SYSTEM_CLOCK (clock);
GstClockReturn ret;
GST_LOCK (clock);
target = time + sys_clock->absolute_start;
timeval.tv_usec = target % 1000000;
timeval.tv_sec = target / 1000000;
g_cond_timed_wait (cond, GST_GET_LOCK (clock), &timeval);
GST_UNLOCK (clock);
ret = GST_CLOCK_TIMEOUT;
g_cond_free (cond);
return ret;
}
static guint64
gst_system_clock_get_resolution (GstClock *clock)
{
return 1;
}