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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* Copyright (C) 2009 David Schleef <ds@schleef.org>
*
* gst1394clock.c: Clock for use by IEEE 1394 plugins
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst1394clock.h"
GST_DEBUG_CATEGORY_STATIC (gst_1394_clock_debug);
#define GST_CAT_DEFAULT gst_1394_clock_debug
static void gst_1394_clock_class_init (Gst1394ClockClass * klass);
static void gst_1394_clock_init (Gst1394Clock * clock);
static GstClockTime gst_1394_clock_get_internal_time (GstClock * clock);
static GstSystemClockClass *parent_class = NULL;
/* static guint gst_1394_clock_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_1394_clock_get_type (void)
{
static GType clock_type = 0;
if (!clock_type) {
static const GTypeInfo clock_info = {
sizeof (Gst1394ClockClass),
NULL,
NULL,
(GClassInitFunc) gst_1394_clock_class_init,
NULL,
NULL,
sizeof (Gst1394Clock),
4,
(GInstanceInitFunc) gst_1394_clock_init,
NULL
};
clock_type = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "Gst1394Clock",
&clock_info, 0);
}
return clock_type;
}
static void
gst_1394_clock_class_init (Gst1394ClockClass * klass)
{
GstClockClass *gstclock_class;
gstclock_class = (GstClockClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gstclock_class->get_internal_time = gst_1394_clock_get_internal_time;
GST_DEBUG_CATEGORY_INIT (gst_1394_clock_debug, "1394clock", 0, "1394clock");
}
static void
gst_1394_clock_init (Gst1394Clock * clock)
{
GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);
}
/**
* gst_1394_clock_new:
* @name: the name of the clock
*
* Create a new #Gst1394Clock instance.
*
* Returns: a new #Gst1394Clock
*/
Gst1394Clock *
gst_1394_clock_new (const gchar * name)
{
Gst1394Clock *_1394clock =
GST_1394_CLOCK (g_object_new (GST_TYPE_1394_CLOCK, "name", name, NULL));
return _1394clock;
}
static GstClockTime
gst_1394_clock_get_internal_time (GstClock * clock)
{
Gst1394Clock *_1394clock;
GstClockTime result;
guint32 cycle_timer;
guint64 local_time;
_1394clock = GST_1394_CLOCK_CAST (clock);
if (_1394clock->handle != NULL) {
raw1394_read_cycle_timer (_1394clock->handle, &cycle_timer, &local_time);
if (cycle_timer < _1394clock->cycle_timer_lo) {
GST_LOG_OBJECT (clock, "overflow %u to %u",
_1394clock->cycle_timer_lo, cycle_timer);
_1394clock->cycle_timer_hi++;
}
_1394clock->cycle_timer_lo = cycle_timer;
/* get the seconds from the cycleSeconds counter */
result = (((((guint64) _1394clock->cycle_timer_hi) << 32) |
cycle_timer) >> 25) * GST_SECOND;
/* add the microseconds from the cycleCount counter */
result += (((cycle_timer >> 12) & 0x1fff) * 125) * GST_USECOND;
GST_LOG_OBJECT (clock, "result %" GST_TIME_FORMAT, GST_TIME_ARGS (result));
} else {
result = GST_CLOCK_TIME_NONE;
}
return result;
}
void
gst_1394_clock_set_handle (Gst1394Clock * clock, raw1394handle_t handle)
{
clock->handle = handle;
clock->cycle_timer_lo = 0;
clock->cycle_timer_hi = 0;
}
void
gst_1394_clock_unset_handle (Gst1394Clock * clock)
{
clock->handle = NULL;
}
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