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 "gstclock.h"
#define CLASS(clock) GST_CLOCK_CLASS (G_OBJECT_GET_CLASS (clock))
static void gst_clock_class_init (GstClockClass *klass);
static void gst_clock_init (GstClock *clock);
static GstObjectClass *parent_class = NULL;
/* static guint gst_clock_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_clock_get_type (void)
{
static GType clock_type = 0;
if (!clock_type) {
static const GTypeInfo clock_info = {
sizeof (GstObjectClass),
NULL,
NULL,
(GClassInitFunc) gst_clock_class_init,
NULL,
NULL,
sizeof (GstObject),
4,
(GInstanceInitFunc) gst_clock_init,
NULL
};
clock_type = g_type_register_static (GST_TYPE_OBJECT, "GstClock",
&clock_info, G_TYPE_FLAG_ABSTRACT);
}
return clock_type;
}
static void
gst_clock_class_init (GstClockClass *klass)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
gobject_class = (GObjectClass*) klass;
gstobject_class = (GstObjectClass*) klass;
parent_class = g_type_class_ref (GST_TYPE_OBJECT);
}
static void
gst_clock_init (GstClock *clock)
{
clock->speed = 1.0;
clock->active = FALSE;
clock->start_time = 0;
clock->active_mutex = g_mutex_new ();
clock->active_cond = g_cond_new ();
}
void
gst_clock_reset (GstClock *clock)
{
g_return_if_fail (GST_IS_CLOCK (clock));
clock->start_time = 0;
clock->active = FALSE;
if (CLASS (clock)->reset)
CLASS (clock)->reset (clock);
}
void
gst_clock_activate (GstClock *clock, gboolean active)
{
g_return_if_fail (GST_IS_CLOCK (clock));
clock->active = active;
if (CLASS (clock)->activate)
CLASS (clock)->activate (clock, active);
g_mutex_lock (clock->active_mutex);
g_cond_signal (clock->active_cond);
g_mutex_unlock (clock->active_mutex);
}
gboolean
gst_clock_is_active (GstClock *clock)
{
g_return_val_if_fail (GST_IS_CLOCK (clock), FALSE);
return clock->active;
}
void
gst_clock_set_time (GstClock *clock, GstClockTime time)
{
g_return_if_fail (GST_IS_CLOCK (clock));
if (CLASS (clock)->set_time)
CLASS (clock)->set_time (clock, time);
}
GstClockTime
gst_clock_get_time (GstClock *clock)
{
g_return_val_if_fail (GST_IS_CLOCK (clock), 0LL);
if (CLASS (clock)->get_time)
return CLASS (clock)->get_time (clock);
return 0LL;
}
GstClockReturn
gst_clock_wait (GstClock *clock, GstClockTime time)
{
g_return_val_if_fail (GST_IS_CLOCK (clock), GST_CLOCK_STOPPED);
if (!clock->active) {
g_mutex_lock (clock->active_mutex);
g_cond_wait (clock->active_cond, clock->active_mutex);
g_mutex_unlock (clock->active_mutex);
}
if (CLASS (clock)->wait)
return CLASS (clock)->wait (clock, time);
return GST_CLOCK_TIMEOUT;
}
void
gst_clock_set_resolution (GstClock *clock, guint64 resolution)
{
g_return_if_fail (GST_IS_CLOCK (clock));
if (CLASS (clock)->set_resolution)
CLASS (clock)->set_resolution (clock, resolution);
}
guint64
gst_clock_get_resolution (GstClock *clock)
{
g_return_val_if_fail (GST_IS_CLOCK (clock), 0LL);
if (CLASS (clock)->get_resolution)
return CLASS (clock)->get_resolution (clock);
return 0LL;
}