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139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstclock.c: Clock subsystem for maintaining time sync
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gstossclock.h"
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static void gst_oss_clock_class_init (GstOssClockClass *klass);
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static void gst_oss_clock_init (GstOssClock *clock);
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static GstClockTime gst_oss_clock_get_internal_time (GstClock *clock);
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static GstSystemClockClass *parent_class = NULL;
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/* static guint gst_oss_clock_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_oss_clock_get_type (void)
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{
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static GType clock_type = 0;
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if (!clock_type) {
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static const GTypeInfo clock_info = {
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sizeof (GstOssClockClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_oss_clock_class_init,
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NULL,
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NULL,
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sizeof (GstOssClock),
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4,
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(GInstanceInitFunc) gst_oss_clock_init,
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NULL
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};
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clock_type = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "GstOssClock",
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&clock_info, 0);
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}
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return clock_type;
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}
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static void
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gst_oss_clock_class_init (GstOssClockClass *klass)
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{
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GObjectClass *gobject_class;
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GstObjectClass *gstobject_class;
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GstClockClass *gstclock_class;
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gobject_class = (GObjectClass*) klass;
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gstobject_class = (GstObjectClass*) klass;
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gstclock_class = (GstClockClass*) klass;
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parent_class = g_type_class_ref (GST_TYPE_SYSTEM_CLOCK);
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gstclock_class->get_internal_time = gst_oss_clock_get_internal_time;
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}
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static void
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gst_oss_clock_init (GstOssClock *clock)
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{
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gst_object_set_name (GST_OBJECT (clock), "GstOssClock");
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clock->prev1 = 0;
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clock->prev2 = 0;
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}
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GstOssClock*
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gst_oss_clock_new (gchar *name, GstOssClockGetTimeFunc func, gpointer user_data)
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{
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GstOssClock *oss_clock = GST_OSS_CLOCK (g_object_new (GST_TYPE_OSS_CLOCK, NULL));
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oss_clock->func = func;
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oss_clock->user_data = user_data;
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oss_clock->adjust = 0;
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return oss_clock;
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}
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void
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gst_oss_clock_set_active (GstClock *clock, gboolean active)
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{
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GstOssClock *oss_clock = GST_OSS_CLOCK (clock);
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GTimeVal timeval;
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GstClockTime time;
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GstClockTime osstime;
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g_get_current_time (&timeval);
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time = GST_TIMEVAL_TO_TIME (timeval);
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osstime = oss_clock->func (clock, oss_clock->user_data);
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if (active) {
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oss_clock->adjust = time - osstime;
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}
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else {
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oss_clock->adjust = osstime - time;
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}
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oss_clock->active = active;
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}
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static GstClockTime
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gst_oss_clock_get_internal_time (GstClock *clock)
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{
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GstOssClock *oss_clock = GST_OSS_CLOCK (clock);
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if (oss_clock->active) {
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GstClockTime osstime;
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osstime = oss_clock->func (clock, oss_clock->user_data) + oss_clock->adjust;
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return osstime;
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}
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else {
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GstClockTime time;
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GTimeVal timeval;
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g_get_current_time (&timeval);
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time = GST_TIMEVAL_TO_TIME (timeval);
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return time;
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}
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}
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