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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_videodevice.h - V4L2 Video Device
*/
#ifndef __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
#define __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
#include <array>
#include <atomic>
#include <memory>
#include <stdint.h>
#include <string>
#include <vector>
#include <linux/videodev2.h>
#include <libcamera/base/class.h>
#include <libcamera/base/log.h>
#include <libcamera/base/signal.h>
#include <libcamera/framebuffer.h>
#include <libcamera/geometry.h>
#include <libcamera/pixel_format.h>
#include "libcamera/internal/formats.h"
#include "libcamera/internal/v4l2_device.h"
#include "libcamera/internal/v4l2_pixelformat.h"
namespace libcamera {
class EventNotifier;
class FileDescriptor;
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 |
V4L2_CAP_VIDEO_M2M_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 isM2M() const
{
return device_caps() & (V4L2_CAP_VIDEO_M2M |
V4L2_CAP_VIDEO_M2M_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 V4L2BufferCache
{
public:
V4L2BufferCache(unsigned int numEntries);
V4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
~V4L2BufferCache();
int get(const FrameBuffer &buffer);
void put(unsigned int index);
private:
class Entry
{
public:
Entry();
Entry(bool free, uint64_t lastUsed, const FrameBuffer &buffer);
bool operator==(const FrameBuffer &buffer) const;
bool free_;
uint64_t lastUsed_;
private:
struct Plane {
Plane(const FrameBuffer::Plane &plane)
: fd(plane.fd.fd()), length(plane.length)
{
}
int fd;
unsigned int length;
};
std::vector<Plane> planes_;
};
std::atomic<uint64_t> lastUsedCounter_;
std::vector<Entry> cache_;
/* \todo Expose the miss counter through an instrumentation API. */
unsigned int missCounter_;
};
class V4L2DeviceFormat
{
public:
struct Plane {
uint32_t size = 0;
uint32_t bpl = 0;
};
V4L2PixelFormat fourcc;
Size size;
std::array<Plane, 3> planes;
unsigned int planesCount = 0;
const std::string toString() const;
};
class V4L2VideoDevice : public V4L2Device
{
public:
using Formats = std::map<V4L2PixelFormat, std::vector<SizeRange>>;
explicit V4L2VideoDevice(const std::string &deviceNode);
explicit V4L2VideoDevice(const MediaEntity *entity);
~V4L2VideoDevice();
int open();
int open(int handle, enum v4l2_buf_type type);
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 V4L2Capability &caps() const { return caps_; }
int getFormat(V4L2DeviceFormat *format);
int tryFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
Formats formats(uint32_t code = 0);
int setSelection(unsigned int target, Rectangle *rect);
int allocateBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
int exportBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
int importBuffers(unsigned int count);
int releaseBuffers();
int queueBuffer(FrameBuffer *buffer);
Signal<FrameBuffer *> bufferReady;
int streamOn();
int streamOff();
static std::unique_ptr<V4L2VideoDevice>
fromEntityName(const MediaDevice *media, const std::string &entity);
V4L2PixelFormat toV4L2PixelFormat(const PixelFormat &pixelFormat);
protected:
std::string logPrefix() const override;
private:
LIBCAMERA_DISABLE_COPY(V4L2VideoDevice)
int getFormatMeta(V4L2DeviceFormat *format);
int trySetFormatMeta(V4L2DeviceFormat *format, bool set);
int getFormatMultiplane(V4L2DeviceFormat *format);
int trySetFormatMultiplane(V4L2DeviceFormat *format, bool set);
int getFormatSingleplane(V4L2DeviceFormat *format);
int trySetFormatSingleplane(V4L2DeviceFormat *format, bool set);
std::vector<V4L2PixelFormat> enumPixelformats(uint32_t code);
std::vector<SizeRange> enumSizes(V4L2PixelFormat pixelFormat);
int requestBuffers(unsigned int count, enum v4l2_memory memoryType);
int createBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
std::unique_ptr<FrameBuffer> createBuffer(unsigned int index);
FileDescriptor exportDmabufFd(unsigned int index, unsigned int plane);
void bufferAvailable(EventNotifier *notifier);
FrameBuffer *dequeueBuffer();
V4L2Capability caps_;
enum v4l2_buf_type bufferType_;
enum v4l2_memory memoryType_;
V4L2BufferCache *cache_;
std::map<unsigned int, FrameBuffer *> queuedBuffers_;
EventNotifier *fdBufferNotifier_;
bool streaming_;
};
class V4L2M2MDevice
{
public:
V4L2M2MDevice(const std::string &deviceNode);
~V4L2M2MDevice();
int open();
void close();
V4L2VideoDevice *output() { return output_; }
V4L2VideoDevice *capture() { return capture_; }
private:
std::string deviceNode_;
V4L2VideoDevice *output_;
V4L2VideoDevice *capture_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__ */
|
