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
|
/* G-Streamer generic V4L element - generic V4L overlay handling
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* 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.
*/
//#define DEBUG
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <string.h>
#include <errno.h>
#include "v4l_calls.h"
/******************************************************
* gst_v4l_set_overlay():
* calls v4l-conf
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_overlay (GstV4lElement *v4lelement,
gchar *display)
{
gchar *buff;
#ifdef DEBUG
fprintf(stderr, "V4L: gst_v4l_set_overlay(), display = \'%s\'\n", display);
#endif
GST_V4L_CHECK_NOT_OPEN(v4lelement);
/* start v4l-conf */
buff = g_strdup_printf("v4l-conf -q -c %s -d %s",
v4lelement->videodev?v4lelement->videodev:"/dev/video", display);
switch (system(buff))
{
case -1:
gst_element_error(GST_ELEMENT(v4lelement),
"Could not start v4l-conf: %s", sys_errlist[errno]);
g_free(buff);
return FALSE;
case 0:
break;
default:
gst_element_error(GST_ELEMENT(v4lelement),
"v4l-conf failed to run correctly: %s", sys_errlist[errno]);
g_free(buff);
return FALSE;
}
g_free(buff);
return TRUE;
}
/******************************************************
* gst_v4l_set_vwin():
* does the VIDIOCSVWIN ioctl()
* return value: TRUE on success, FALSE on error
******************************************************/
static gboolean
gst_v4l_set_vwin (GstV4lElement *v4lelement)
{
if (ioctl(v4lelement->video_fd, VIDIOCSWIN, &(v4lelement->vwin)) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Failed to set the video window: %s",
sys_errlist[errno]);
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_window():
* sets the window where to display the video overlay
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_window (GstV4lElement *v4lelement,
gint x, gint y,
gint w, gint h)
{
#ifdef DEBUG
fprintf(stderr, "V4L: gst_v4l_set_window(), position (x,y/wxh) = %d,%d/%dx%d\n",
x, y, w, h);
#endif
GST_V4L_CHECK_OVERLAY(v4lelement);
v4lelement->vwin.clipcount = 0;
v4lelement->vwin.x = x;
v4lelement->vwin.y = y;
v4lelement->vwin.width = w;
v4lelement->vwin.height = h;
v4lelement->vwin.flags = 0;
return gst_v4l_set_vwin(v4lelement);
}
/******************************************************
* gst_v4l_set_clips():
* sets video overlay clips
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_set_clips (GstV4lElement *v4lelement,
struct video_clip *clips,
gint num_clips)
{
#ifdef DEBUG
fprintf(stderr, "V4L: gst_v4l_set_clips()\n");
#endif
GST_V4L_CHECK_OPEN(v4lelement);
GST_V4L_CHECK_OVERLAY(v4lelement);
if (!(v4lelement->vcap.type & VID_TYPE_CLIPPING))
{
gst_element_error(GST_ELEMENT(v4lelement),
"Device \'%s\' doesn't do clipping",
v4lelement->videodev?v4lelement->videodev:"/dev/video");
return FALSE;
}
v4lelement->vwin.clips = clips;
v4lelement->vwin.clipcount = num_clips;
return gst_v4l_set_vwin(v4lelement);
}
/******************************************************
* gst_v4l_set_overlay():
* enables/disables actual video overlay display
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l_enable_overlay (GstV4lElement *v4lelement,
gboolean enable)
{
gint doit = enable?1:0;
#ifdef DEBUG
fprintf(stderr, "V4L: gst_v4l_enable_overlay(), enable = %s\n",
enable?"true":"false");
#endif
GST_V4L_CHECK_OPEN(v4lelement);
GST_V4L_CHECK_OVERLAY(v4lelement);
if (ioctl(v4lelement->video_fd, VIDIOCCAPTURE, &doit) < 0)
{
gst_element_error(GST_ELEMENT(v4lelement),
"Failed to %s overlay display: %s",
enable?"enable":"disable", sys_errlist[errno]);
return FALSE;
}
return TRUE;
}
|
