gstreamer/gst/gstclock.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 DEBUG_ENABLED
#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() {
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_IS_SINK(obj)) {
DEBUG("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);
DEBUG("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;
//if (clock->locking) now = 0;
g_mutex_unlock(clock->lock);
//DEBUG("gst_clock: diff with for time %08llu %08lld %08lld %08llu\n", time, now, GST_CLOCK_DIFF(time, now), clock->start_time);
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;
DEBUG("gst_clock: setting start clock %llu\n", clock->start_time);
//clock->locking = TRUE;
g_mutex_unlock(clock->lock);
}
void gst_clock_wait(GstClock *clock, GstClockTime time, GstObject *obj) {
struct timeval tfnow;
GstClockTime now;
GstClockTimeDiff diff;
//DEBUG("gst_clock: requesting clock object 0x%p %08llu %08llu\n", obj, time, clock->current_time);
gettimeofday(&tfnow, (struct timezone *)NULL);
g_mutex_lock(clock->lock);
now = tfnow.tv_sec*1000000LL+tfnow.tv_usec - clock->start_time;
//now = clock->current_time + clock->adjust;
diff = GST_CLOCK_DIFF(time, now);
// if we are not behind wait a bit
DEBUG("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 printf("gst_clock: %s waiting %u %llu %llu %llu seconds\n", gst_element_get_name(GST_ELEMENT(obj)),
(int)tfnow.tv_sec, now, diff, time);
//DEBUG("gst_clock: 0x%p waiting for time %llu %llu %lld %llu\n", obj, time, target, diff, now);
//DEBUG("waiting %d.%08d\n",tfnow.tv_sec, tfnow.tv_usec);
//DEBUG("gst_clock: 0x%p waiting done time %llu \n", obj, time);
}
DEBUG("gst_clock: %s waiting for time %08llu %08llu %08lld done \n", gst_element_get_name(GST_ELEMENT(obj)), time, now, diff);
// clock->current_time = clock->start_time + time;
//gst_clock_set(clock, time);
}