blob: 895658805b4788728fb36a1749a0f6e3ea8c4d62 (
plain)
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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_videodevice.h - V4L2 Video Device
*/
#ifndef __LIBCAMERA_V4L2_VIDEODEVICE_H__
#define __LIBCAMERA_V4L2_VIDEODEVICE_H__
#include <atomic>
#include <string>
#include <vector>
#include <linux/videodev2.h>
#include <libcamera/geometry.h>
#include <libcamera/signal.h>
#include "formats.h"
#include "log.h"
namespace libcamera {
class Buffer;
class BufferPool;
class EventNotifier;
class MediaDevice;
class MediaEntity;
struct V4L2Capability final : v4l2_capability {
const char *driver() const
{
return reinterpret_cast<const char *>(v4l2_capability::driver);
}
const char *card() const
{
return reinterpret_cast<const char *>(v4l2_capability::card);
}
const char *bus_info() const
{
return reinterpret_cast<const char *>(v4l2_capability::bus_info);
}
unsigned int device_caps() const
{
return capabilities & V4L2_CAP_DEVICE_CAPS
? v4l2_capability::device_caps
: v4l2_capability::capabilities;
}
bool isMultiplanar() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isCapture() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_META_CAPTURE);
}
bool isOutput() const
{
return device_caps() & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE |
V4L2_CAP_META_OUTPUT);
}
bool isVideo() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isMeta() const
{
return device_caps() & (V4L2_CAP_META_CAPTURE |
V4L2_CAP_META_OUTPUT);
}
bool isVideoCapture() const
{
return isVideo() && isCapture();
}
bool isVideoOutput() const
{
return isVideo() && isOutput();
}
bool isMetaCapture() const
{
return isMeta() && isCapture();
}
bool isMetaOutput() const
{
return isMeta() && isOutput();
}
bool hasStreaming() const
{
return device_caps() & V4L2_CAP_STREAMING;
}
};
class V4L2DeviceFormat
{
public:
uint32_t fourcc;
Size size;
struct {
uint32_t size;
uint32_t bpl;
} planes[3];
unsigned int planesCount;
const std::string toString() const;
};
class V4L2VideoDevice : protected Loggable
{
public:
explicit V4L2VideoDevice(const std::string &deviceNode);
explicit V4L2VideoDevice(const MediaEntity *entity);
V4L2VideoDevice(const V4L2VideoDevice &) = delete;
~V4L2VideoDevice();
V4L2VideoDevice &operator=(const V4L2VideoDevice &) = delete;
int open();
bool isOpen() const;
void close();
const char *driverName() const { return caps_.driver(); }
const char *deviceName() const { return caps_.card(); }
const char *busName() const { return caps_.bus_info(); }
const std::string &deviceNode() const { return deviceNode_; }
int getFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
ImageFormats formats();
int exportBuffers(BufferPool *pool);
int importBuffers(BufferPool *pool);
int releaseBuffers();
int queueBuffer(Buffer *buffer);
Signal<Buffer *> bufferReady;
int streamOn();
int streamOff();
static V4L2VideoDevice *fromEntityName(const MediaDevice *media,
const std::string &entity);
protected:
std::string logPrefix() const;
private:
int getFormatMeta(V4L2DeviceFormat *format);
int setFormatMeta(V4L2DeviceFormat *format);
int getFormatMultiplane(V4L2DeviceFormat *format);
int setFormatMultiplane(V4L2DeviceFormat *format);
int getFormatSingleplane(V4L2DeviceFormat *format);
int setFormatSingleplane(V4L2DeviceFormat *format);
int requestBuffers(unsigned int count);
int createPlane(Buffer *buffer, unsigned int plane,
unsigned int length);
std::vector<unsigned int> enumPixelformats();
std::vector<SizeRange> enumSizes(unsigned int pixelFormat);
Buffer *dequeueBuffer();
void bufferAvailable(EventNotifier *notifier);
std::string deviceNode_;
int fd_;
V4L2Capability caps_;
enum v4l2_buf_type bufferType_;
enum v4l2_memory memoryType_;
BufferPool *bufferPool_;
std::atomic<unsigned int> queuedBuffersCount_;
EventNotifier *fdEvent_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_V4L2_VIDEODEVICE_H__ */
|
