Commit 38b288c6 authored by Wim Taymans's avatar Wim Taymans

A poor mans clock...

Original commit message from CVS:
A poor mans clock...
parent 5b0ba06f
/* 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;
static int num;
/**
* 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);
num =0;
clock->locking = TRUE;
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: registered sink object 0x%p\n", obj);
clock->sinkobjects = g_list_append(clock->sinkobjects, obj);
num++;
}
}
void gst_clock_set(GstClock *clock, GstClockTime time) {
struct timeval tfnow;
GstClockTime target, now;
g_mutex_lock(clock->lock);
gettimeofday(&tfnow, (struct timezone *)NULL);
now = tfnow.tv_sec*1000000+tfnow.tv_usec;
clock->adjust = now - (clock->start_time + time);
clock->current_time = (clock->start_time + time);
//DEBUG("gst_clock: setting clock to %llu %llu %lld\n", (guint64)clock->start_time+time, (guint64)now, (gint64)clock->adjust);
g_mutex_unlock(clock->lock);
}
void gst_clock_reset(GstClock *clock) {
struct timeval tfnow;
gettimeofday(&tfnow, (struct timezone *)NULL);
clock->start_time = tfnow.tv_sec*1000000+tfnow.tv_usec;
clock->current_time = clock->start_time;
clock->adjust = 0LL;
DEBUG("gst_clock: setting start clock %llu\n", clock->start_time);
}
void gst_clock_wait(GstClock *clock, GstClockTime time, GstObject *obj) {
struct timeval tfnow;
GstClockTime target, now;
GstClockTimeDiff diff;
GList *elements;
g_mutex_lock(clock->lock);
elements = clock->sinkobjects;
while (elements && clock->locking) {
if (elements->data == obj) {
DEBUG("gst_clock: registered sink object 0x%p\n", obj);
num--;
if (num) {
DEBUG("gst_clock: 0x%p locked\n", obj);
g_mutex_unlock(clock->lock);
g_mutex_lock(clock->sinkmutex);
g_mutex_lock(clock->lock);
clock->locking = FALSE;
}
else {
DEBUG("gst_clock: unlock all %p\n", obj);
gst_clock_reset(clock);
g_mutex_unlock(clock->sinkmutex);
clock->locking = FALSE;
}
break;
}
elements = g_list_next(elements);
}
target = clock->start_time + time;
gettimeofday(&tfnow, (struct timezone *)NULL);
now = tfnow.tv_sec*1000000+tfnow.tv_usec + clock->adjust;
//now = clock->current_time + clock->adjust;
//DEBUG("gst_clock: 0x%p waiting for time %llu %llu\n", obj, time, target);
diff = GST_CLOCK_DIFF(target, now);
// if we are not behind wait a bit
if (diff > 1000 ) {
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) fprintf(stderr, "gst_clock: waiting %u %llu %llu %llu seconds\n", (int)tfnow.tv_sec, now, diff, target);
g_mutex_unlock(clock->lock);
//DEBUG("gst_clock: 0x%p waiting for time %llu %llu %lld %llu\n", obj, time, target, diff, now);
select(0, NULL, NULL, NULL, &tfnow);
//DEBUG("gst_clock: 0x%p waiting done time %llu %llu\n", obj, time, target);
g_mutex_lock(clock->lock);
}
// clock->current_time = clock->start_time + time;
g_mutex_unlock(clock->lock);
//gst_clock_set(clock, time);
}
/* 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.
*/
#ifndef __GST_CLOCK_H__
#define __GST_CLOCK_H__
#include <gst/gst.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef guint64 GstClockTime;
typedef gint64 GstClockTimeDiff;
#define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((s)-(e))
typedef struct _GstClock GstClock;
struct _GstClock {
gchar *name;
GstClockTime start_time;
GstClockTime current_time;
GstClockTimeDiff adjust;
gboolean locking;
GList *sinkobjects;
GMutex *sinkmutex;
GMutex *lock;
};
GstClock *gst_clock_new(gchar *name);
GstClock *gst_clock_get_system(void);
void gst_clock_register(GstClock *clock, GstObject *obj);
void gst_clock_set(GstClock *clock, GstClockTime time);
void gst_clock_reset(GstClock *clock);
void gst_clock_wait(GstClock *clock, GstClockTime time, GstObject *obj);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __GST_CLOCK_H__ */
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