1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (C) 2001 CodeFactory AB
* Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
* Copyright (C) 2001-2002 Andy Wingo <apwingo@eos.ncsu.edu>
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstalsaclock.h"
/* clock functions */
static void gst_alsa_clock_class_init (gpointer g_class, gpointer class_data);
static void gst_alsa_clock_init (GstAlsaClock * clock);
static GstClockTime gst_alsa_clock_get_internal_time (GstClock * clock);
static guint64 gst_alsa_clock_get_resolution (GstClock * clock);
static GstClockEntryStatus gst_alsa_clock_wait (GstClock * clock,
GstClockEntry * entry);
static void gst_alsa_clock_unlock (GstClock * clock, GstClockEntry * entry);
static GstClockClass *clock_parent_class = NULL;
/* static guint gst_alsa_clock_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_alsa_clock_get_type (void)
{
static GType clock_type = 0;
if (!clock_type) {
static const GTypeInfo clock_info = {
sizeof (GstAlsaClockClass),
NULL,
NULL,
gst_alsa_clock_class_init,
NULL,
NULL,
sizeof (GstAlsaClock),
4,
(GInstanceInitFunc) gst_alsa_clock_init,
NULL
};
clock_type = g_type_register_static (GST_TYPE_CLOCK, "GstAlsaClock",
&clock_info, 0);
}
return clock_type;
}
static void
gst_alsa_clock_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstClockClass *gstclock_class;
GstAlsaClockClass *klass;
klass = (GstAlsaClockClass *) g_class;
gobject_class = (GObjectClass *) klass;
gstobject_class = (GstObjectClass *) klass;
gstclock_class = (GstClockClass *) klass;
clock_parent_class = g_type_class_ref (GST_TYPE_CLOCK);
gstclock_class->get_internal_time = gst_alsa_clock_get_internal_time;
gstclock_class->get_resolution = gst_alsa_clock_get_resolution;
gstclock_class->wait = gst_alsa_clock_wait;
gstclock_class->unlock = gst_alsa_clock_unlock;
}
static void
gst_alsa_clock_init (GstAlsaClock * clock)
{
gst_object_set_name (GST_OBJECT (clock), "GstAlsaClock");
clock->start_time = GST_CLOCK_TIME_NONE;
}
GstAlsaClock *
gst_alsa_clock_new (gchar * name, GstAlsaClockGetTimeFunc get_time,
GstAlsa * owner)
{
GstAlsaClock *alsa_clock =
GST_ALSA_CLOCK (g_object_new (GST_TYPE_ALSA_CLOCK, NULL));
g_assert (alsa_clock);
alsa_clock->get_time = get_time;
alsa_clock->owner = owner;
alsa_clock->adjust = 0;
gst_object_set_name (GST_OBJECT (alsa_clock), name);
gst_object_set_parent (GST_OBJECT (alsa_clock), GST_OBJECT (owner));
return alsa_clock;
}
void
gst_alsa_clock_start (GstAlsaClock * clock)
{
g_assert (!GST_CLOCK_TIME_IS_VALID (clock->start_time));
if (clock->owner->format) {
clock->start_time = gst_clock_get_event_time (GST_CLOCK (clock))
- clock->get_time (clock->owner);
} else {
clock->start_time = gst_clock_get_event_time (GST_CLOCK (clock));
}
}
void
gst_alsa_clock_stop (GstAlsaClock * clock)
{
GTimeVal timeval;
g_get_current_time (&timeval);
g_assert (GST_CLOCK_TIME_IS_VALID (clock->start_time));
clock->adjust +=
GST_TIMEVAL_TO_TIME (timeval) -
gst_clock_get_event_time (GST_CLOCK (clock));
clock->start_time = GST_CLOCK_TIME_NONE;
}
static GstClockTime
gst_alsa_clock_get_internal_time (GstClock * clock)
{
GstAlsaClock *alsa_clock = GST_ALSA_CLOCK (clock);
if (GST_CLOCK_TIME_IS_VALID (alsa_clock->start_time)) {
return alsa_clock->get_time (alsa_clock->owner) + alsa_clock->start_time;
} else {
GTimeVal timeval;
g_get_current_time (&timeval);
return GST_TIMEVAL_TO_TIME (timeval) + alsa_clock->adjust;
}
}
static guint64
gst_alsa_clock_get_resolution (GstClock * clock)
{
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
if (this->owner->format) {
return GST_SECOND / this->owner->format->rate;
} else {
/* FIXME: is there an "unknown" value? We just return the sysclock's time by default */
return 1 * GST_USECOND;
}
}
static GstClockEntryStatus
gst_alsa_clock_wait (GstClock * clock, GstClockEntry * entry)
{
GstClockTime target, entry_time;
GstClockTimeDiff diff;
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
entry_time = gst_alsa_clock_get_internal_time (clock);
diff = GST_CLOCK_ENTRY_TIME (entry) - gst_clock_get_time (clock);
if (diff < 0)
return GST_CLOCK_ENTRY_EARLY;
if (diff > clock->max_diff) {
GST_INFO_OBJECT (this,
"GstAlsaClock: abnormal clock request diff: %" G_GINT64_FORMAT ") >"
" %" G_GINT64_FORMAT, diff, clock->max_diff);
return GST_CLOCK_ENTRY_EARLY;
}
target = entry_time + diff;
GST_DEBUG_OBJECT (this, "real_target %" G_GUINT64_FORMAT
" target %" G_GUINT64_FORMAT
" now %" G_GUINT64_FORMAT,
target, GST_CLOCK_ENTRY_TIME (entry), entry_time);
while (gst_alsa_clock_get_internal_time (clock) < target &&
this->last_unlock < entry_time) {
g_usleep (gst_alsa_clock_get_resolution (clock) * G_USEC_PER_SEC /
GST_SECOND);
}
return entry->status;
}
static void
gst_alsa_clock_unlock (GstClock * clock, GstClockEntry * entry)
{
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
this->last_unlock = this->get_time (this->owner);
}
|
