-
-
Notifications
You must be signed in to change notification settings - Fork 24.6k
Expand file tree
/
Copy pathcamera_linux.cpp
More file actions
188 lines (159 loc) · 5.87 KB
/
camera_linux.cpp
File metadata and controls
188 lines (159 loc) · 5.87 KB
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
/**************************************************************************/
/* camera_linux.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "camera_linux.h"
#include "camera_feed_linux.h"
#include <dirent.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
void CameraLinux::camera_thread_func(void *p_camera_linux) {
if (p_camera_linux) {
CameraLinux *camera_linux = (CameraLinux *)p_camera_linux;
camera_linux->_update_devices();
}
}
void CameraLinux::_update_devices() {
while (!exit_flag.is_set()) {
{
MutexLock lock(camera_mutex);
for (int i = feeds.size() - 1; i >= 0; i--) {
Ref<CameraFeedLinux> feed = (Ref<CameraFeedLinux>)feeds[i];
if (feed.is_null()) {
continue;
}
String device_name = feed->get_device_name();
if (!_is_active(device_name)) {
remove_feed(feed);
}
}
struct dirent **devices;
int count = scandir("/dev", &devices, nullptr, alphasort);
if (count != -1) {
for (int i = 0; i < count; i++) {
struct dirent *device = devices[i];
if (strncmp(device->d_name, "video", 5) == 0) {
String device_name = String("/dev/") + String(device->d_name);
if (!_has_device(device_name)) {
_add_device(device_name);
}
}
free(device);
}
}
free(devices);
}
call_deferred("emit_signal", SNAME(CameraServer::feeds_updated_signal_name));
usleep(1000000);
}
}
bool CameraLinux::_has_device(const String &p_device_name) {
for (int i = 0; i < feeds.size(); i++) {
Ref<CameraFeedLinux> feed = (Ref<CameraFeedLinux>)feeds[i];
if (feed.is_null()) {
continue;
}
if (feed->get_device_name() == p_device_name) {
return true;
}
}
return false;
}
void CameraLinux::_add_device(const String &p_device_name) {
int file_descriptor = _open_device(p_device_name);
if (file_descriptor != -1) {
if (_is_video_capture_device(file_descriptor)) {
Ref<CameraFeedLinux> feed = memnew(CameraFeedLinux(p_device_name));
add_feed(feed);
}
}
close(file_descriptor);
}
int CameraLinux::_open_device(const String &p_device_name) {
struct stat s;
if (stat(p_device_name.ascii().get_data(), &s) == -1) {
return -1;
}
if (!S_ISCHR(s.st_mode)) {
return -1;
}
return open(p_device_name.ascii().get_data(), O_RDWR | O_NONBLOCK, 0);
}
// TODO any cheaper/cleaner way to check if file descriptor is invalid?
bool CameraLinux::_is_active(const String &p_device_name) {
struct v4l2_capability capability;
bool result = false;
int file_descriptor = _open_device(p_device_name);
if (file_descriptor != -1 && ioctl(file_descriptor, VIDIOC_QUERYCAP, &capability) != -1) {
result = true;
}
close(file_descriptor);
return result;
}
bool CameraLinux::_is_video_capture_device(int p_file_descriptor) {
struct v4l2_capability capability;
if (ioctl(p_file_descriptor, VIDIOC_QUERYCAP, &capability) == -1) {
return false;
}
if (!(capability.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
return false;
}
if (!(capability.capabilities & V4L2_CAP_STREAMING)) {
return false;
}
return _can_query_format(p_file_descriptor, V4L2_BUF_TYPE_VIDEO_CAPTURE);
}
bool CameraLinux::_can_query_format(int p_file_descriptor, int p_type) {
struct v4l2_format format;
memset(&format, 0, sizeof(format));
format.type = p_type;
return ioctl(p_file_descriptor, VIDIOC_G_FMT, &format) != -1;
}
inline void CameraLinux::set_monitoring_feeds(bool p_monitoring_feeds) {
if (p_monitoring_feeds == monitoring_feeds) {
return;
}
CameraServer::set_monitoring_feeds(p_monitoring_feeds);
if (p_monitoring_feeds) {
exit_flag.clear();
camera_thread.start(CameraLinux::camera_thread_func, this);
} else {
exit_flag.set();
if (camera_thread.is_started()) {
camera_thread.wait_to_finish();
}
}
}
CameraLinux::~CameraLinux() {
exit_flag.set();
if (camera_thread.is_started()) {
camera_thread.wait_to_finish();
}
}