aboutsummaryrefslogtreecommitdiffstats
path: root/lib/libv4l-mplane/libv4l-mplane.c
blob: 5659dd57bfe7bb61f17cd7025c146b5e4f970f7c (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
/*
 *             (C) 2012 Mauro Carvalho Chehab
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335  USA
 */

#include <config.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/syscall.h>

#include <linux/videodev2.h>

#include "libv4l-plugin.h"

#define SYS_IOCTL(fd, cmd, arg) \
	syscall(SYS_ioctl, (int)(fd), (unsigned long)(cmd), (void *)(arg))
#define SYS_READ(fd, buf, len) \
	syscall(SYS_read, (int)(fd), (void *)(buf), (size_t)(len));
#define SYS_WRITE(fd, buf, len) \
	syscall(SYS_write, (int)(fd), (const void *)(buf), (size_t)(len));


#if HAVE_VISIBILITY
#define PLUGIN_PUBLIC __attribute__ ((visibility("default")))
#else
#define PLUGIN_PUBLIC
#endif

struct mplane_plugin {
	union {
		struct {
			unsigned int		mplane_capture : 1;
			unsigned int		mplane_output  : 1;
		};
		unsigned int mplane;
	};
};

#define SIMPLE_CONVERT_IOCTL(fd, cmd, arg, __struc) ({		\
	int __ret;						\
	struct __struc *req = arg;				\
	uint32_t type = req->type;				\
	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||	\
	    type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {	\
		errno = EINVAL;					\
		__ret = -1;					\
	} else {						\
		req->type = convert_type(type);			\
		__ret = SYS_IOCTL(fd, cmd, arg);		\
		req->type = type;				\
	}							\
	__ret;							\
	})

static void *plugin_init(int fd)
{
	struct v4l2_capability cap;
	int ret;
	struct mplane_plugin plugin, *ret_plugin;

	memset(&plugin, 0, sizeof(plugin));

	/* Check if device needs mplane plugin */
	memset(&cap, 0, sizeof(cap));
	ret = SYS_IOCTL(fd, VIDIOC_QUERYCAP, &cap);
	if (ret) {
		perror("Failed to query video capabilities");
		return NULL;
	}

	if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) &&
	    (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE))
		plugin.mplane_capture = 1;

	if (!(cap.capabilities & V4L2_CAP_VIDEO_OUTPUT) &&
	    (cap.capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE))
		plugin.mplane_output = 1;

	/* Device doesn't need it. return NULL to disable the plugin */
	if (!plugin.mplane)
		return NULL;

	/* Allocate and initialize private data */
	ret_plugin = calloc(1, sizeof(*ret_plugin));
	if (!ret_plugin) {
		perror("Couldn't allocate memory for plugin");
		return NULL;
	}
	*ret_plugin = plugin;

	printf("Using mplane plugin for %s%s\n",
	       plugin.mplane_capture ? "capture " : "",
	       plugin.mplane_output ? "output " : "");

	return ret_plugin;
}

static void plugin_close(void *dev_ops_priv) {
	if (dev_ops_priv == NULL)
		return;

	free(dev_ops_priv);
}

static int querycap_ioctl(int fd, unsigned long int cmd,
			  struct v4l2_capability *arg)
{
	struct v4l2_capability *cap = arg;
	int ret;
	
	ret = SYS_IOCTL(fd, cmd, cap);
	if (ret)
		return ret;

	/* Report mplane as normal caps */
	if (cap->capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE)
		cap->capabilities |= V4L2_CAP_VIDEO_CAPTURE;

	if (cap->capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE)
		cap->capabilities |= V4L2_CAP_VIDEO_OUTPUT;

	if (cap->device_caps & V4L2_CAP_VIDEO_CAPTURE_MPLANE)
		cap->device_caps |= V4L2_CAP_VIDEO_CAPTURE;

	if (cap->device_caps & V4L2_CAP_VIDEO_OUTPUT_MPLANE)
		cap->device_caps |= V4L2_CAP_VIDEO_OUTPUT;

	/*
	 * Don't report mplane caps, as this will be handled via
	 * this plugin
	 */
	cap->capabilities &= ~(V4L2_CAP_VIDEO_OUTPUT_MPLANE |
			       V4L2_CAP_VIDEO_CAPTURE_MPLANE);
	cap->device_caps &= ~(V4L2_CAP_VIDEO_OUTPUT_MPLANE |
			      V4L2_CAP_VIDEO_CAPTURE_MPLANE);

	return 0;
}

static int convert_type(int type)
{
	switch (type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		return V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		return V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
	default:
		return type;
	}
}

static int try_set_fmt_ioctl(int fd, unsigned long int cmd,
			     struct v4l2_format *arg)
{
	struct v4l2_format fmt = { 0 };
	struct v4l2_format *org = arg;
	int ret;

	switch (arg->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
		errno = EINVAL;
		return -1;
	default:
		return SYS_IOCTL(fd, cmd, arg);
	}

	fmt.fmt.pix_mp.width = org->fmt.pix.width;
	fmt.fmt.pix_mp.height = org->fmt.pix.height;
	fmt.fmt.pix_mp.pixelformat = org->fmt.pix.pixelformat;
	fmt.fmt.pix_mp.field = org->fmt.pix.field;
	fmt.fmt.pix_mp.colorspace = org->fmt.pix.colorspace;
	fmt.fmt.pix_mp.num_planes = 1;
	fmt.fmt.pix_mp.plane_fmt[0].bytesperline = org->fmt.pix.bytesperline;
	fmt.fmt.pix_mp.plane_fmt[0].sizeimage = org->fmt.pix.sizeimage;

	ret = SYS_IOCTL(fd, cmd, &fmt);
	if (ret)
		return ret;

	org->fmt.pix.width = fmt.fmt.pix_mp.width;
	org->fmt.pix.height = fmt.fmt.pix_mp.height;
	org->fmt.pix.pixelformat = fmt.fmt.pix_mp.pixelformat;
	org->fmt.pix.field = fmt.fmt.pix_mp.field;
	org->fmt.pix.colorspace = fmt.fmt.pix_mp.colorspace;
	org->fmt.pix.bytesperline = fmt.fmt.pix_mp.plane_fmt[0].bytesperline;
	org->fmt.pix.sizeimage = fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
	org->fmt.pix.priv = 0;

	return 0;
}

static int create_bufs_ioctl(int fd, unsigned long int cmd,
			     struct v4l2_create_buffers *arg)
{
	struct v4l2_create_buffers cbufs = { 0 };
	struct v4l2_format *fmt = &cbufs.format;
	struct v4l2_format *org = &arg->format;
	int ret;

	switch (arg->format.type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		fmt->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
		errno = EINVAL;
		return -1;
	default:
		return SYS_IOCTL(fd, cmd, arg);
	}

	cbufs.index = arg->index;
	cbufs.count = arg->count;
	cbufs.memory = arg->memory;
	fmt->fmt.pix_mp.width = org->fmt.pix.width;
	fmt->fmt.pix_mp.height = org->fmt.pix.height;
	fmt->fmt.pix_mp.pixelformat = org->fmt.pix.pixelformat;
	fmt->fmt.pix_mp.field = org->fmt.pix.field;
	fmt->fmt.pix_mp.colorspace = org->fmt.pix.colorspace;
	fmt->fmt.pix_mp.num_planes = 1;
	fmt->fmt.pix_mp.plane_fmt[0].bytesperline = org->fmt.pix.bytesperline;
	fmt->fmt.pix_mp.plane_fmt[0].sizeimage = org->fmt.pix.sizeimage;

	ret = SYS_IOCTL(fd, cmd, &cbufs);

	arg->index = cbufs.index;
	arg->count = cbufs.count;
	org->fmt.pix.width = fmt->fmt.pix_mp.width;
	org->fmt.pix.height = fmt->fmt.pix_mp.height;
	org->fmt.pix.pixelformat = fmt->fmt.pix_mp.pixelformat;
	org->fmt.pix.field = fmt->fmt.pix_mp.field;
	org->fmt.pix.colorspace = fmt->fmt.pix_mp.colorspace;
	org->fmt.pix.bytesperline = fmt->fmt.pix_mp.plane_fmt[0].bytesperline;
	org->fmt.pix.sizeimage = fmt->fmt.pix_mp.plane_fmt[0].sizeimage;

	return ret;
}

static int get_fmt_ioctl(int fd, unsigned long int cmd, struct v4l2_format *arg)
{
	struct v4l2_format fmt = { 0 };
	struct v4l2_format *org = arg;
	int ret;

	switch (arg->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
		fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
		break;
	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
		errno = EINVAL;
		return -1;
	default:
		return SYS_IOCTL(fd, cmd, arg);
	}

	ret = SYS_IOCTL(fd, cmd, &fmt);
	if (ret)
		return ret;

	org->fmt.pix.width = fmt.fmt.pix_mp.width;
	org->fmt.pix.height = fmt.fmt.pix_mp.height;
	org->fmt.pix.pixelformat = fmt.fmt.pix_mp.pixelformat;
	org->fmt.pix.field = fmt.fmt.pix_mp.field;
	org->fmt.pix.colorspace = fmt.fmt.pix_mp.colorspace;
	org->fmt.pix.bytesperline = fmt.fmt.pix_mp.plane_fmt[0].bytesperline;
	org->fmt.pix.sizeimage = fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
	org->fmt.pix.priv = 0;

	/*
	 * If the device doesn't support just one plane, there's
	 * nothing we can do, except return an error condition.
	 */
	if (fmt.fmt.pix_mp.num_planes > 1) {
		errno = EINVAL;
		return -1;
	}

	return ret;
}

static int buf_ioctl(int fd, unsigned long int cmd, struct v4l2_buffer *arg)
{
	struct v4l2_buffer buf = *arg;
	struct v4l2_plane plane = { 0 };
	int ret;

	if (arg->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
	    arg->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
		errno = EINVAL;
		return -1;
	}

	buf.type = convert_type(arg->type);

	if (buf.type == arg->type)
		return SYS_IOCTL(fd, cmd, &buf);

	memcpy(&plane.m, &arg->m, sizeof(plane.m));
	plane.length = arg->length;
	plane.bytesused = arg->bytesused;
	
	buf.m.planes = &plane;
	buf.length = 1;

	ret = SYS_IOCTL(fd, cmd, &buf);

	arg->index = buf.index;
	arg->memory = buf.memory;
	arg->flags = buf.flags;
	arg->field = buf.field;
	arg->timestamp = buf.timestamp;
	arg->timecode = buf.timecode;
	arg->sequence = buf.sequence;

	arg->length = plane.length;
	arg->bytesused = plane.bytesused;
	memcpy(&arg->m, &plane.m, sizeof(arg->m));

	return ret;
}

static int plugin_ioctl(void *dev_ops_priv, int fd,
			unsigned long int cmd, void *arg)
{
	switch (cmd) {
	case VIDIOC_QUERYCAP:
		return querycap_ioctl(fd, cmd, arg);
	case VIDIOC_TRY_FMT:
	case VIDIOC_S_FMT:
		return try_set_fmt_ioctl(fd, cmd, arg);
	case VIDIOC_G_FMT:
		return get_fmt_ioctl(fd, cmd, arg);
	case VIDIOC_ENUM_FMT:
		return SIMPLE_CONVERT_IOCTL(fd, cmd, arg, v4l2_fmtdesc);
	case VIDIOC_S_PARM:
	case VIDIOC_G_PARM:
		return SIMPLE_CONVERT_IOCTL(fd, cmd, arg, v4l2_streamparm);
	case VIDIOC_QBUF:
	case VIDIOC_DQBUF:
	case VIDIOC_QUERYBUF:
	case VIDIOC_PREPARE_BUF:
		return buf_ioctl(fd, cmd, arg);
	case VIDIOC_CREATE_BUFS:
		return create_bufs_ioctl(fd, cmd, arg);
	case VIDIOC_REQBUFS:
		return SIMPLE_CONVERT_IOCTL(fd, cmd, arg, v4l2_requestbuffers);
	case VIDIOC_STREAMON:
	case VIDIOC_STREAMOFF:
	{
		int type = *(int *)arg;

		if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
		    type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
			errno = EINVAL;
			return -1;
		}
		type = convert_type(type);

		return SYS_IOCTL(fd, cmd, &type);
	}
	/* CASE VIDIOC_EXPBUF: */
	default:
		return SYS_IOCTL(fd, cmd, arg);
	}
}

static ssize_t plugin_read(void *dev_ops_priv, int fd, void *buf, size_t len)
{
	return SYS_READ(fd, buf, len);
}

static ssize_t plugin_write(void *dev_ops_priv, int fd, const void *buf,
                         size_t len)
{
	return SYS_WRITE(fd, buf, len);
}

PLUGIN_PUBLIC const struct libv4l_dev_ops libv4l2_plugin = {
	.init = &plugin_init,
	.close = &plugin_close,
	.ioctl = &plugin_ioctl,
	.read = &plugin_read,
	.write = &plugin_write,
};

Privacy Policy