summaryrefslogtreecommitdiff
path: root/utils/kmscapture.cpp
blob: f215a655c9acda482edeedacd084a760af704353 (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
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
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
#include <linux/videodev2.h>
#include <cstdio>
#include <string.h>
#include <poll.h>
#include <fcntl.h>
#include <unistd.h>
#include <fstream>
#include <sys/ioctl.h>
#include <xf86drm.h>
#include <glob.h>

#include <kms++/kms++.h>
#include <kms++util/kms++util.h>

#define CAMERA_BUF_QUEUE_SIZE	3
#define MAX_CAMERA		9

using namespace std;
using namespace kms;

enum class BufferProvider {
	DRM,
	V4L2,
};

class CameraPipeline
{
public:
	CameraPipeline(int cam_fd, Card& card, Crtc* crtc, Plane* plane, uint32_t x, uint32_t y,
		       uint32_t iw, uint32_t ih, PixelFormat pixfmt,
		       BufferProvider buffer_provider);
	~CameraPipeline();

	CameraPipeline(const CameraPipeline& other) = delete;
	CameraPipeline& operator=(const CameraPipeline& other) = delete;

	void show_next_frame(AtomicReq &req);
	int fd() const { return m_fd; }
	void start_streaming();
private:
	DmabufFramebuffer* GetDmabufFrameBuffer(Card& card, uint32_t i, PixelFormat pixfmt);
	int m_fd;	/* camera file descriptor */
	Crtc* m_crtc;
	Plane* m_plane;
	BufferProvider m_buffer_provider;
	vector<Framebuffer*> m_fb;
	int m_prev_fb_index;
	uint32_t m_in_width, m_in_height; /* camera capture resolution */
	/* image properties for display */
	uint32_t m_out_width, m_out_height;
	uint32_t m_out_x, m_out_y;
};

static int buffer_export(int v4lfd, enum v4l2_buf_type bt, uint32_t index, int *dmafd)
{
	struct v4l2_exportbuffer expbuf;

	memset(&expbuf, 0, sizeof(expbuf));
	expbuf.type = bt;
	expbuf.index = index;
	if (ioctl(v4lfd, VIDIOC_EXPBUF, &expbuf) == -1) {
		perror("VIDIOC_EXPBUF");
		return -1;
	}

	*dmafd = expbuf.fd;

	return 0;
}

DmabufFramebuffer* CameraPipeline::GetDmabufFrameBuffer(Card& card, uint32_t i, PixelFormat pixfmt)
{
	int r, dmafd;

	r = buffer_export(m_fd, V4L2_BUF_TYPE_VIDEO_CAPTURE, i, &dmafd);
	ASSERT(r == 0);

	const PixelFormatInfo& format_info = get_pixel_format_info(pixfmt);
	ASSERT(format_info.num_planes == 1);

	vector<int> fds { dmafd };
	vector<uint32_t> pitches { m_in_width * (format_info.planes[0].bitspp / 8) };
	vector<uint32_t> offsets { 0 };

	return new DmabufFramebuffer(card, m_in_width, m_in_height, pixfmt,
				  fds, pitches, offsets);
}

bool inline better_size(struct v4l2_frmsize_discrete* v4ldisc,
			uint32_t iw, uint32_t ih,
			uint32_t best_w, uint32_t best_h)
{
	if (v4ldisc->width <= iw && v4ldisc->height <= ih &&
	    (v4ldisc->width >= best_w || v4ldisc->height >= best_h))
		return true;

	return false;
}

CameraPipeline::CameraPipeline(int cam_fd, Card& card, Crtc *crtc, Plane* plane, uint32_t x, uint32_t y,
			       uint32_t iw, uint32_t ih, PixelFormat pixfmt,
			       BufferProvider buffer_provider)
	: m_fd(cam_fd), m_crtc(crtc), m_buffer_provider(buffer_provider), m_prev_fb_index(-1)
{

	int r;
	uint32_t best_w = 320;
	uint32_t best_h = 240;

	struct v4l2_frmsizeenum v4lfrms = { };
	v4lfrms.pixel_format = (uint32_t)pixfmt;
	while (ioctl(m_fd, VIDIOC_ENUM_FRAMESIZES, &v4lfrms) == 0) {
		if (v4lfrms.type != V4L2_FRMSIZE_TYPE_DISCRETE) {
			v4lfrms.index++;
			continue;
		}

		if (v4lfrms.discrete.width > iw || v4lfrms.discrete.height > ih) {
			//skip
		} else if (v4lfrms.discrete.width == iw && v4lfrms.discrete.height == ih) {
			// Exact match
			best_w = v4lfrms.discrete.width;
			best_h = v4lfrms.discrete.height;
			break;
		} else if (v4lfrms.discrete.width >= best_w || v4lfrms.discrete.height >= ih) {
			best_w = v4lfrms.discrete.width;
			best_h = v4lfrms.discrete.height;
		}

		v4lfrms.index++;
	};

	m_out_width = m_in_width = best_w;
	m_out_height = m_in_height = best_h;
	/* Move it to the middle of the requested area */
	m_out_x = x + iw / 2 - m_out_width / 2;
	m_out_y = y + ih / 2 - m_out_height / 2;

	printf("Capture: %ux%u\n", best_w, best_h);

	struct v4l2_format v4lfmt = { };
	v4lfmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	r = ioctl(m_fd, VIDIOC_G_FMT, &v4lfmt);
	ASSERT(r == 0);

	v4lfmt.fmt.pix.pixelformat = (uint32_t)pixfmt;
	v4lfmt.fmt.pix.width = m_in_width;
	v4lfmt.fmt.pix.height = m_in_height;

	r = ioctl(m_fd, VIDIOC_S_FMT, &v4lfmt);
	ASSERT(r == 0);

	uint32_t v4l_mem;

	if (m_buffer_provider == BufferProvider::V4L2)
		v4l_mem = V4L2_MEMORY_MMAP;
	else
		v4l_mem = V4L2_MEMORY_DMABUF;

	struct v4l2_requestbuffers v4lreqbuf = { };
	v4lreqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	v4lreqbuf.memory = v4l_mem;
	v4lreqbuf.count = CAMERA_BUF_QUEUE_SIZE;
	r = ioctl(m_fd, VIDIOC_REQBUFS, &v4lreqbuf);
	ASSERT(r == 0);
	ASSERT(v4lreqbuf.count == CAMERA_BUF_QUEUE_SIZE);

	struct v4l2_buffer v4lbuf = { };
	v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	v4lbuf.memory = v4l_mem;

	for (unsigned i = 0; i < CAMERA_BUF_QUEUE_SIZE; i++) {
		Framebuffer *fb;

		if (m_buffer_provider == BufferProvider::V4L2)
			fb = GetDmabufFrameBuffer(card, i, pixfmt);
		else
			fb = new DumbFramebuffer(card, m_in_width,
						 m_in_height, pixfmt);

		v4lbuf.index = i;
		if (m_buffer_provider == BufferProvider::DRM)
			v4lbuf.m.fd = fb->prime_fd(0);
		r = ioctl(m_fd, VIDIOC_QBUF, &v4lbuf);
		ASSERT(r == 0);

		m_fb.push_back(fb);
	}

	m_plane = plane;

	// Do initial plane setup with first fb, so that we only need to
	// set the FB when page flipping
	AtomicReq req(card);

	Framebuffer *fb = m_fb[0];

	req.add(m_plane, "CRTC_ID", m_crtc->id());
	req.add(m_plane, "FB_ID", fb->id());

	req.add(m_plane, "CRTC_X", m_out_x);
	req.add(m_plane, "CRTC_Y", m_out_y);
	req.add(m_plane, "CRTC_W", m_out_width);
	req.add(m_plane, "CRTC_H", m_out_height);

	req.add(m_plane, "SRC_X", 0);
	req.add(m_plane, "SRC_Y", 0);
	req.add(m_plane, "SRC_W", m_in_width << 16);
	req.add(m_plane, "SRC_H", m_in_height << 16);

	r = req.commit_sync();
	FAIL_IF(r, "initial plane setup failed");
}

CameraPipeline::~CameraPipeline()
{
	for (unsigned i = 0; i < m_fb.size(); i++)
		delete m_fb[i];

	::close(m_fd);
}

void CameraPipeline::start_streaming()
{
	enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;

	int r = ioctl(m_fd, VIDIOC_STREAMON, &type);
	FAIL_IF(r, "Failed to enable camera stream: %d", r);
}

void CameraPipeline::show_next_frame(AtomicReq& req)
{
	int r;
	uint32_t v4l_mem;

	if (m_buffer_provider == BufferProvider::V4L2)
		v4l_mem = V4L2_MEMORY_MMAP;
	else
		v4l_mem = V4L2_MEMORY_DMABUF;

	struct v4l2_buffer v4l2buf = { };
	v4l2buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	v4l2buf.memory = v4l_mem;
	r = ioctl(m_fd, VIDIOC_DQBUF, &v4l2buf);
	if (r != 0) {
		printf("VIDIOC_DQBUF ioctl failed with %d\n", errno);
		return;
	}

	unsigned fb_index = v4l2buf.index;

	Framebuffer *fb = m_fb[fb_index];

	req.add(m_plane, "FB_ID", fb->id());

	if (m_prev_fb_index >= 0) {
		memset(&v4l2buf, 0, sizeof(v4l2buf));
		v4l2buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
		v4l2buf.memory = v4l_mem;
		v4l2buf.index = m_prev_fb_index;
		if (m_buffer_provider == BufferProvider::DRM)
			v4l2buf.m.fd = m_fb[m_prev_fb_index]->prime_fd(0);
		r = ioctl(m_fd, VIDIOC_QBUF, &v4l2buf);
		ASSERT(r == 0);

	}

	m_prev_fb_index = fb_index;
}

static bool is_capture_dev(int fd)
{
	struct v4l2_capability cap = { };
	int r = ioctl(fd, VIDIOC_QUERYCAP, &cap);
	ASSERT(r == 0);
	return cap.capabilities & V4L2_CAP_VIDEO_CAPTURE;
}

std::vector<std::string> glob(const std::string& pat)
{
	glob_t glob_result;
	glob(pat.c_str(), 0, NULL, &glob_result);
	vector<string> ret;
	for(unsigned i = 0; i < glob_result.gl_pathc; ++i)
		ret.push_back(string(glob_result.gl_pathv[i]));
	globfree(&glob_result);
	return ret;
}

static const char* usage_str =
		"Usage: kmscapture [OPTIONS]\n\n"
		"Options:\n"
		"  -s, --single                Single camera mode. Open only /dev/video0\n"
		"      --buffer-type=<drm|v4l> Use DRM or V4L provided buffers. Default: DRM\n"
		"  -h, --help                  Print this help\n"
		;

int main(int argc, char** argv)
{
	BufferProvider buffer_provider = BufferProvider::DRM;
	bool single_cam = false;

	OptionSet optionset = {
		Option("s|single", [&]()
		{
			single_cam = true;
		}),
		Option("|buffer-type=", [&](string s)
		{
			if (s == "v4l")
				buffer_provider = BufferProvider::V4L2;
			else if (s == "drm")
				buffer_provider = BufferProvider::DRM;
			else
				FAIL("Invalid buffer provider: %s", s.c_str());
		}),
		Option("h|help", [&]()
		{
			puts(usage_str);
			exit(-1);
		}),
	};

	optionset.parse(argc, argv);

	if (optionset.params().size() > 0) {
		puts(usage_str);
		exit(-1);
	}

	auto pixfmt = PixelFormat::YUYV;

	Card card;

	auto conn = card.get_first_connected_connector();
	auto crtc = conn->get_current_crtc();
	printf("Display: %dx%d\n", crtc->width(), crtc->height());
	printf("Buffer provider: %s\n", buffer_provider == BufferProvider::V4L2? "V4L" : "DRM");

	vector<int> camera_fds;

	for (string vidpath : glob("/dev/video*")) {
		int fd = ::open(vidpath.c_str(), O_RDWR | O_NONBLOCK);

		if (fd < 0)
			continue;

		if (!is_capture_dev(fd)) {
			close(fd);
			continue;
		}

		camera_fds.push_back(fd);
		printf("Using %s\n", vidpath.c_str());

		if (single_cam)
			break;
	}

	FAIL_IF(camera_fds.size() == 0, "No cameras found");

	vector<Plane*> available_planes;
	for (Plane* p : crtc->get_possible_planes()) {
		if (p->plane_type() != PlaneType::Overlay)
			continue;

		if (!p->supports_format(pixfmt))
			continue;

		available_planes.push_back(p);
	}

	FAIL_IF(available_planes.size() < camera_fds.size(), "Not enough video planes for cameras");

	uint32_t plane_w = crtc->width() / camera_fds.size();
	vector<CameraPipeline*> cameras;

	for (unsigned i = 0; i < camera_fds.size(); ++i) {
		int cam_fd = camera_fds[i];
		Plane* plane = available_planes[i];

		auto cam = new CameraPipeline(cam_fd, card, crtc, plane, i * plane_w, 0,
					      plane_w, crtc->height(), pixfmt, buffer_provider);
		cameras.push_back(cam);
	}

	unsigned nr_cameras = cameras.size();

	vector<pollfd> fds(nr_cameras + 1);

	for (unsigned i = 0; i < nr_cameras; i++) {
		fds[i].fd = cameras[i]->fd();
		fds[i].events =  POLLIN;
	}
	fds[nr_cameras].fd = 0;
	fds[nr_cameras].events =  POLLIN;

	for (auto cam : cameras)
		cam->start_streaming();

	while (true) {
		int r = poll(fds.data(), nr_cameras + 1, -1);
		ASSERT(r > 0);

		if (fds[nr_cameras].revents != 0)
			break;

		AtomicReq req(card);

		for (unsigned i = 0; i < nr_cameras; i++) {
			if (!fds[i].revents)
				continue;
			cameras[i]->show_next_frame(req);
			fds[i].revents = 0;
		}

		r = req.test();
		FAIL_IF(r, "Atomic commit failed: %d", r);

		req.commit_sync();
	}

	for (auto cam : cameras)
		delete cam;
}