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
|
/* G-Streamer generic V4L2 element - generic V4L2 overlay handling
* Copyright (C) 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#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 "v4l2_calls.h"
#define DEBUG(format, args...) \
GST_DEBUG_ELEMENT(GST_CAT_PLUGIN_INFO, \
GST_ELEMENT(v4l2element), \
"V4L2-overlay: " format, ##args)
/******************************************************
* gst_v4l2_set_display():
* calls v4l-conf
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_display (GstV4l2Element *v4l2element,
const gchar *display)
{
gchar *buff;
DEBUG("trying to set overlay to '%s'", display);
/* start v4l-conf */
buff = g_strdup_printf("v4l-conf -q -c %s -d %s",
v4l2element->device?v4l2element->device:"/dev/video", display);
switch (system(buff)) {
case -1:
gst_element_error(GST_ELEMENT(v4l2element),
"Could not start v4l-conf: %s", strerror(errno));
g_free(buff);
return FALSE;
case 0:
break;
default:
gst_element_error(GST_ELEMENT(v4l2element),
"v4l-conf failed to run correctly: %s", strerror(errno));
g_free(buff);
return FALSE;
}
g_free(buff);
return TRUE;
}
/******************************************************
* gst_v4l2_set_window():
* sets the window where to display the video overlay
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_set_window (GstV4l2Element *v4l2element,
gint x,
gint y,
gint w,
gint h,
struct v4l2_clip *clips,
gint num_clips)
{
struct v4l2_window vwin;
DEBUG("trying to set video window to %dx%d,%d,%d", x,y,w,h);
GST_V4L2_CHECK_OVERLAY(v4l2element);
GST_V4L2_CHECK_OPEN(v4l2element);
vwin.clipcount = 0;
vwin.x = x;
vwin.y = y;
vwin.width = w;
vwin.height = h;
vwin.clips = clips;
vwin.clipcount = num_clips;
if (ioctl(v4l2element->video_fd, VIDIOC_S_WIN, &vwin) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to set the video window on device %s: %s",
v4l2element->device, strerror(errno));
return FALSE;
}
return TRUE;
}
/******************************************************
* gst_v4l_set_overlay():
* enables/disables actual video overlay display
* return value: TRUE on success, FALSE on error
******************************************************/
gboolean
gst_v4l2_enable_overlay (GstV4l2Element *v4l2element,
gboolean enable)
{
gint doit = enable?1:0;
DEBUG("trying to %s overlay display", enable?"enable":"disable");
GST_V4L2_CHECK_OPEN(v4l2element);
GST_V4L2_CHECK_OVERLAY(v4l2element);
if (ioctl(v4l2element->video_fd, VIDIOC_PREVIEW, &doit) < 0) {
gst_element_error(GST_ELEMENT(v4l2element),
"Failed to %s overlay display for device %s: %s",
enable?"enable":"disable", v4l2element->device, strerror(errno));
return FALSE;
}
return TRUE;
}
|
