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154 lines
4 KiB
C
154 lines
4 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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* Copyright (C) 2009 David Schleef <ds@schleef.org>
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*
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* gst1394clock.c: Clock for use by IEEE 1394 plugins
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gst1394clock.h"
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GST_DEBUG_CATEGORY_STATIC (gst_1394_clock_debug);
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#define GST_CAT_DEFAULT gst_1394_clock_debug
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static void gst_1394_clock_class_init (Gst1394ClockClass * klass);
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static void gst_1394_clock_init (Gst1394Clock * clock);
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static GstClockTime gst_1394_clock_get_internal_time (GstClock * clock);
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static GstSystemClockClass *parent_class = NULL;
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/* static guint gst_1394_clock_signals[LAST_SIGNAL] = { 0 }; */
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GType
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gst_1394_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 (Gst1394ClockClass),
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NULL,
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NULL,
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(GClassInitFunc) gst_1394_clock_class_init,
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NULL,
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NULL,
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sizeof (Gst1394Clock),
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4,
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(GInstanceInitFunc) gst_1394_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, "Gst1394Clock",
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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_1394_clock_class_init (Gst1394ClockClass * klass)
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{
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GstClockClass *gstclock_class;
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gstclock_class = (GstClockClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gstclock_class->get_internal_time = gst_1394_clock_get_internal_time;
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GST_DEBUG_CATEGORY_INIT (gst_1394_clock_debug, "1394clock", 0, "1394clock");
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}
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static void
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gst_1394_clock_init (Gst1394Clock * clock)
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{
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GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);
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}
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/**
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* gst_1394_clock_new:
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* @name: the name of the clock
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*
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* Create a new #Gst1394Clock instance.
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*
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* Returns: a new #Gst1394Clock
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*/
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Gst1394Clock *
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gst_1394_clock_new (const gchar * name)
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{
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Gst1394Clock *_1394clock =
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GST_1394_CLOCK (g_object_new (GST_TYPE_1394_CLOCK, "name", name, NULL));
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return _1394clock;
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}
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static GstClockTime
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gst_1394_clock_get_internal_time (GstClock * clock)
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{
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Gst1394Clock *_1394clock;
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GstClockTime result;
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guint32 cycle_timer;
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guint64 local_time;
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_1394clock = GST_1394_CLOCK_CAST (clock);
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if (_1394clock->handle != NULL) {
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GST_OBJECT_LOCK (clock);
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raw1394_read_cycle_timer (_1394clock->handle, &cycle_timer, &local_time);
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if (cycle_timer < _1394clock->cycle_timer_lo) {
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GST_LOG_OBJECT (clock, "overflow %u to %u",
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_1394clock->cycle_timer_lo, cycle_timer);
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_1394clock->cycle_timer_hi++;
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}
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_1394clock->cycle_timer_lo = cycle_timer;
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/* get the seconds from the cycleSeconds counter */
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result = (((((guint64) _1394clock->cycle_timer_hi) << 32) |
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cycle_timer) >> 25) * GST_SECOND;
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/* add the microseconds from the cycleCount counter */
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result += (((cycle_timer >> 12) & 0x1fff) * 125) * GST_USECOND;
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GST_LOG_OBJECT (clock, "result %" GST_TIME_FORMAT, GST_TIME_ARGS (result));
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GST_OBJECT_UNLOCK (clock);
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} else {
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result = GST_CLOCK_TIME_NONE;
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}
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return result;
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}
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void
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gst_1394_clock_set_handle (Gst1394Clock * clock, raw1394handle_t handle)
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{
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clock->handle = handle;
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clock->cycle_timer_lo = 0;
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clock->cycle_timer_hi = 0;
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}
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void
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gst_1394_clock_unset_handle (Gst1394Clock * clock)
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{
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clock->handle = NULL;
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}
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