summaryrefslogtreecommitdiffstats
path: root/v4l2-mfc-encoder/v4l_dev.c
blob: 7a062f290e437bd7eacf89ca850accb89e8046e9 (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
/*
 * mfc codec encoding example application
 * Andrzej Hajda <a.hajda@samsung.com>
 *
 * V4L I/O device implementation.
 *
 * Copyright 2012 Samsung Electronics Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/mman.h>

#include "io_dev.h"
#include "v4l_dev.h"
#include "mfc.h"

enum v4l2_memory io_type_to_memory(enum io_type type)
{
	switch (type) {
	case IO_USERPTR: return V4L2_MEMORY_USERPTR;
	case IO_MMAP: return V4L2_MEMORY_MMAP;
	default: return 0;
	}
}

int is_buf_type(enum io_type type)
{
	return (type == IO_USERPTR) || (type == IO_MMAP);
}

enum v4l2_buf_type io_dir_to_type(enum io_dir dir)
{
	switch (dir) {
	case DIR_IN: return V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
	case DIR_OUT: return V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
	default: return 0;
	}
}

/* switch on/off streaming on v4l device */
int v4l_stream_set(struct io_dev *dev, int op)
{
	int ret;
	int buf_type;

	if (dev->io[DIR_IN].type != IO_NONE) {
		buf_type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
		ret = ioctl(dev->fd, op ? VIDIOC_STREAMON : VIDIOC_STREAMOFF,
								&buf_type);
		if (ret != 0) {
			err("Cannot %s stream on fd=%d:0",
					op ? "start" : "stop", dev->fd);
			return -1;
		}

		dev->io[DIR_IN].state = op ? FS_BUSY : FS_END;

		dbg("Stream %s on fd=%d:0", op ? "started" : "stopped",
								dev->fd);
	}

	if (dev->io[DIR_OUT].type != IO_NONE) {
		buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
		ret = ioctl(dev->fd, op ? VIDIOC_STREAMON : VIDIOC_STREAMOFF,
								&buf_type);
		if (ret != 0) {
			err("Cannot %s stream on fd=%d:1",
					op ? "start" : "stop", dev->fd);
			return -1;
		}

		dev->io[DIR_OUT].state = op ? FS_BUSY : FS_END;

		dbg("Stream %s on fd=%d:1", op ? "started" : "stopped",
								dev->fd);
	}

	return 0;
}

int v4l_req_bufs(struct io_dev *dev, enum io_dir dir, int nelem)
{
	int ret;
	struct v4l2_requestbuffers reqbuf;

	memzero(reqbuf);
	reqbuf.count = nelem;
	reqbuf.type = io_dir_to_type(dir);
	reqbuf.memory = io_type_to_memory(dev->io[dir].type);

	ret = ioctl(dev->fd, VIDIOC_REQBUFS, &reqbuf);
	if (ret != 0) {
		err("Failed to request %d buffers for device %d:%d)", nelem,
							dev->fd, dir);
		return -1;
	}

	dbg("Succesfully requested %d buffers for device %d:%d", nelem,
								dev->fd, dir);

	return reqbuf.count;
}

/* dequeue v4l buffer, adjust io_port fields, stop stream when needed,
   set end state when counter reaches limit,
   set limit on out port if in port is stopped */
int v4l_deq_buf(struct io_dev *dev, enum io_dir dir)
{
	struct v4l2_plane planes[MFC_MAX_PLANES];
	struct v4l2_buffer buf;
	int ret;
	int idx;
	struct dev_buffers *bufs;
	int i;

	bufs = dev->io[dir].bufs;

	memzero(buf);

	buf.type = io_dir_to_type(dir);
	buf.memory = io_type_to_memory(dev->io[dir].type);
	buf.m.planes = planes;
	buf.length = MFC_MAX_PLANES;

	ret = ioctl(dev->fd, VIDIOC_DQBUF, &buf);
	if (ret != 0) {
		dbg("Dequeue buffer error for %d:%d", dev->fd, dir);
		return -1;
	} else
		dbg("Dequeued %d/%d buffer(flags=%02X,s=%d) from %d:%d",
					buf.index, bufs->count, buf.flags,
					buf.m.planes[0].bytesused, dev->fd,
					dir);

	idx = buf.index;

	for (i = 0; i < bufs->nplanes; ++i)
		bufs->bytesused[idx * bufs->nplanes + i] =
						buf.m.planes[i].bytesused;

	--dev->io[dir].nbufs;

	++dev->io[dir].counter;

	if (dev->io[dir].limit && dev->io[dir].limit <= dev->io[dir].counter) {
		dev->io[dir].state = FS_END;
		if (dev->io[DIR_OUT - dir].type == IO_NONE ||
					dev->io[DIR_OUT - dir].state == FS_END)
			v4l_stream_set(dev, 0);
		dbg("End on %d:%d", dev->fd, dir);
	} else {
		dev->io[dir].state = FS_BUSY;
	}

	if (dir == DIR_IN && dev->io[DIR_IN].state == FS_END
						&& !dev->io[DIR_OUT].limit)
		dev->io[DIR_OUT].limit = dev->io[DIR_IN].counter;

	return idx;
}

/* enqueue buffer, start stream when needed */
int v4l_enq_buf(struct io_dev *dev, enum io_dir dir, int idx)
{
	struct v4l2_plane planes[MFC_MAX_PLANES];
	struct v4l2_buffer buf;
	int i;
	int ret;
	struct dev_buffers *bufs;

	bufs = dev->io[dir].bufs;

	memzero(buf);

	buf.type = io_dir_to_type(dir);
	buf.memory = io_type_to_memory(dev->io[dir].type);
	buf.index = idx;
	buf.m.planes = planes;
	buf.length = bufs->nplanes;
	for (i = 0; i < bufs->nplanes; ++i) {
		planes[i].bytesused = bufs->bytesused[idx * bufs->nplanes + i];
		planes[i].length = bufs->lengths[i];
		planes[i].m.userptr = (unsigned long)bufs->addr[
						idx * bufs->nplanes + i];
	}

	ret = ioctl(dev->fd, VIDIOC_QBUF, &buf);
	if (ret != 0) {
		err("Error %d enq buffer %d/%d to %d:%d", errno, idx,
						bufs->count, dev->fd, dir);
		return -1;
	} else {
		dbg("Enqueued buffer %d/%d to %d:%d", idx, bufs->count,
								dev->fd, dir);
	}

	++dev->io[dir].nbufs;

	if (dev->io[dir].state == FS_OFF)
		if (dir == DIR_IN || dev->io[DIR_IN].type == IO_NONE)
			v4l_stream_set(dev, 1);

	if (dir == DIR_IN && dev->io[dir].limit && dev->io[dir].limit
				<= dev->io[dir].counter + dev->io[dir].nbufs) {
		struct v4l2_encoder_cmd cmd;
		memset(&cmd, 0, sizeof cmd);
		cmd.cmd = V4L2_ENC_CMD_STOP;
		ret = ioctl(dev->fd, VIDIOC_ENCODER_CMD, &cmd);
		dbg("EOS sent to %d:%d, ret=%d", dev->fd, dir, ret);
	}

	return 0;
}

int v4l_deq_event(struct io_dev *dev)
{
	struct v4l2_event ev;
	int ret;

	memzero(ev);
	ret = ioctl(dev->fd, VIDIOC_DQEVENT, &ev);
	if (ret != 0)
		return ret;

	switch (ev.type) {
	case V4L2_EVENT_EOS:
		dev->io[DIR_OUT].state = FS_END;
		dbg("EOS event received on %d", dev->fd);
	}

	dev->event = 0;

	return 0;
}

/* set format on dst device according to src device */
int v4l_copy_fmt(struct io_dev *src, enum io_dir sdir,
		 struct io_dev *dst, enum io_dir ddir)
{
	struct v4l2_format sfmt;
	struct v4l2_format dfmt;
	int ret;

	memzero(sfmt);
	sfmt.type = io_dir_to_type(sdir);
	ret = ioctl(src->fd, VIDIOC_G_FMT, &sfmt);
	if (ret != 0) {
		err("Failed to get format");
		return -1;
	}

	dfmt = sfmt;
	dfmt.type = io_dir_to_type(ddir);
	ret = ioctl(dst->fd, VIDIOC_S_FMT, &dfmt);
	if (ret != 0) {
		err("Failed to set format");
		return -1;
	}

	err("sfmt(type=%d,size=%dx%d,fmt=%.4s,npl=%d,sizes=%d,%d,bpls=%d,%d)",
	    sfmt.type, sfmt.fmt.pix_mp.width, sfmt.fmt.pix_mp.height,
	    (char *)&sfmt.fmt.pix_mp.pixelformat, sfmt.fmt.pix_mp.num_planes,
	    sfmt.fmt.pix_mp.plane_fmt[0].sizeimage,
	    sfmt.fmt.pix_mp.plane_fmt[1].sizeimage,
	    sfmt.fmt.pix_mp.plane_fmt[0].bytesperline,
	    sfmt.fmt.pix_mp.plane_fmt[1].bytesperline);
	err("dfmt(type=%d,size=%dx%d,fmt=%.4s,npl=%d,sizes=%d,%d,bpls=%d,%d)",
	    dfmt.type, dfmt.fmt.pix_mp.width, dfmt.fmt.pix_mp.height,
	    (char *)&dfmt.fmt.pix_mp.pixelformat, dfmt.fmt.pix_mp.num_planes,
	    dfmt.fmt.pix_mp.plane_fmt[0].sizeimage,
	    dfmt.fmt.pix_mp.plane_fmt[1].sizeimage,
	    dfmt.fmt.pix_mp.plane_fmt[0].bytesperline,
	    dfmt.fmt.pix_mp.plane_fmt[1].bytesperline);

	return 0;
}

int v4l_destroy(struct io_dev *dev)
{
	if (dev->io[DIR_IN].type == IO_MMAP)
		dev_bufs_destroy(dev->io[DIR_IN].bufs);

	if (dev->io[DIR_OUT].type == IO_MMAP)
		dev_bufs_destroy(dev->io[DIR_OUT].bufs);

	if (dev->fd >= 0)
		close(dev->fd);

	free(dev);

	return 0;
}

/* requests mmap buffers from device with proper port type, mmap them
   and initialize struct dev_buffers
*/
int dev_bufs_create(struct io_dev *in, struct io_dev *out, int nelem)
{
	enum io_dir dir;
	struct io_dev *master, *slave;
	struct v4l2_buffer qbuf;
	int ret;
	int n, i;
	struct dev_buffers *bufs;
	struct v4l2_plane planes[MFC_MAX_PLANES];

	if (in->io[DIR_OUT].type == IO_MMAP) {
		master = in;
		slave = out;
		dir = DIR_OUT;
	} else if (out->io[DIR_IN].type == IO_MMAP) {
		master = out;
		slave = in;
		dir = DIR_IN;
	} else {
		err("At least one device must have MMAP buffers.");
		return -1;
	}

	nelem = master->ops->req_bufs(master, dir, nelem);
	if (nelem < 0)
		return -1;

	nelem = slave->ops->req_bufs(slave, DIR_OUT - dir, nelem);
	if (nelem < 0)
		return -1;

	bufs = malloc(sizeof(struct dev_buffers));
	in->io[DIR_OUT].bufs = bufs;
	out->io[DIR_IN].bufs = bufs;

	bufs->count = nelem;

	memzero(qbuf);
	qbuf.type = io_dir_to_type(dir);
	qbuf.memory = V4L2_MEMORY_MMAP;
	qbuf.m.planes = planes;
	qbuf.length = MFC_MAX_PLANES;

	for (n = 0; n < nelem; ++n) {
		qbuf.index = n;
		ret = ioctl(master->fd, VIDIOC_QUERYBUF, &qbuf);
		if (ret != 0) {
			err("QUERYBUF failed");
			return -1;
		}

		if (n == 0) {
			for (i = 0; i < qbuf.length; ++i)
				if (qbuf.m.planes[i].length == 0)
					break;
			bufs->nplanes = i;
			bufs->lengths = malloc(bufs->nplanes
						* sizeof(*bufs->lengths));
			for (i = 0; i < bufs->nplanes; ++i)
				bufs->lengths[i] = qbuf.m.planes[i].length;

			bufs->bytesused = malloc(nelem * bufs->nplanes
						* sizeof(*bufs->bytesused));
			bufs->addr = malloc(nelem * bufs->nplanes
						* sizeof(*bufs->addr));
		}

		for (i = 0; i < bufs->nplanes; ++i) {
			bufs->addr[n * bufs->nplanes + i] = mmap(NULL,
						qbuf.m.planes[i].length,
						PROT_READ | PROT_WRITE,
						MAP_SHARED, master->fd,
						qbuf.m.planes[i].m.mem_offset);
			if (bufs->addr[n * bufs->nplanes + i] == MAP_FAILED) {
				err("Failed mmap buffer %d for %d:%d", n,
							master->fd, dir);
				return -1;
			}
		}
		ret = in->ops->enq_buf(in, DIR_OUT, n);
		if (ret < 0)
			return -1;
	}

	return 0;
}

int dev_bufs_destroy(struct dev_buffers *bufs)
{
	free(bufs->addr);
	free(bufs->bytesused);
	free(bufs->lengths);
	free(bufs);

	return 0;
}

struct io_dev_ops v4l_dev_ops = { .req_bufs = v4l_req_bufs,
				  .enq_buf = v4l_enq_buf,
				  .deq_buf = v4l_deq_buf,
				  .deq_event = v4l_deq_event,
				  .destroy = v4l_destroy
				};

Privacy Policy