Restore the possibility to link liba52 instead of dlopening.
[libav.git] / libavformat / v4l2.c
CommitLineData
0a7b514f
LA
1/*
2 * Video4Linux2 grab interface
3 * Copyright (c) 2000,2001 Fabrice Bellard.
4 * Copyright (c) 2006 Luca Abeni.
5 *
6 * Part of this file is based on the V4L2 video capture example
7 * (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
8 *
9 * Thanks to Michael Niedermayer for providing the mapping between
10 * V4L2_PIX_FMT_* and PIX_FMT_*
11 *
12 *
b78e7197
DB
13 * This file is part of FFmpeg.
14 *
15 * FFmpeg is free software; you can redistribute it and/or
0a7b514f
LA
16 * modify it under the terms of the GNU Lesser General Public
17 * License as published by the Free Software Foundation; either
b78e7197 18 * version 2.1 of the License, or (at your option) any later version.
0a7b514f 19 *
b78e7197 20 * FFmpeg is distributed in the hope that it will be useful,
0a7b514f
LA
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * Lesser General Public License for more details.
24 *
25 * You should have received a copy of the GNU Lesser General Public
b78e7197 26 * License along with FFmpeg; if not, write to the Free Software
0a7b514f
LA
27 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 */
29#include "avformat.h"
30#include <unistd.h>
31#include <fcntl.h>
32#include <sys/ioctl.h>
33#include <sys/mman.h>
34#include <sys/time.h>
f743a062
LA
35#include <asm/types.h>
36#include <linux/videodev2.h>
0a7b514f
LA
37#include <time.h>
38
39static const int desired_video_buffers = 256;
40
41enum io_method {
42 io_read,
43 io_mmap,
44 io_userptr
45};
46
47struct video_data {
48 int fd;
49 int frame_format; /* V4L2_PIX_FMT_* */
50 enum io_method io_method;
51 int width, height;
52 int frame_rate;
53 int frame_rate_base;
54 int frame_size;
55 int top_field_first;
56
57 int buffers;
58 void **buf_start;
59 unsigned int *buf_len;
60};
61
62struct fmt_map {
63 enum PixelFormat ff_fmt;
64 int32_t v4l2_fmt;
65};
66
67static struct fmt_map fmt_conversion_table[] = {
68 {
69 .ff_fmt = PIX_FMT_YUV420P,
70 .v4l2_fmt = V4L2_PIX_FMT_YUV420,
71 },
72 {
73 .ff_fmt = PIX_FMT_YUV422P,
74 .v4l2_fmt = V4L2_PIX_FMT_YUV422P,
75 },
76 {
71e445fc 77 .ff_fmt = PIX_FMT_YUYV422,
0a7b514f
LA
78 .v4l2_fmt = V4L2_PIX_FMT_YUYV,
79 },
80 {
81 .ff_fmt = PIX_FMT_UYVY422,
82 .v4l2_fmt = V4L2_PIX_FMT_UYVY,
83 },
84 {
85 .ff_fmt = PIX_FMT_YUV411P,
86 .v4l2_fmt = V4L2_PIX_FMT_YUV411P,
87 },
88 {
89 .ff_fmt = PIX_FMT_YUV410P,
90 .v4l2_fmt = V4L2_PIX_FMT_YUV410,
91 },
92 {
93 .ff_fmt = PIX_FMT_BGR24,
94 .v4l2_fmt = V4L2_PIX_FMT_BGR24,
95 },
96 {
97 .ff_fmt = PIX_FMT_RGB24,
98 .v4l2_fmt = V4L2_PIX_FMT_RGB24,
99 },
100 /*
101 {
71e445fc 102 .ff_fmt = PIX_FMT_RGB32,
0a7b514f
LA
103 .v4l2_fmt = V4L2_PIX_FMT_BGR32,
104 },
105 */
106 {
107 .ff_fmt = PIX_FMT_GRAY8,
108 .v4l2_fmt = V4L2_PIX_FMT_GREY,
109 },
110};
111
112static int device_open(const char *devname, uint32_t *capabilities)
113{
114 struct v4l2_capability cap;
115 int fd;
116 int res;
117
118 fd = open(devname, O_RDWR /*| O_NONBLOCK*/, 0);
119 if (fd < 0) {
120 av_log(NULL, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
121 devname, strerror(errno));
122
123 return -1;
124 }
125
126 res = ioctl(fd, VIDIOC_QUERYCAP, &cap);
c16601bb
AB
127 // ENOIOCTLCMD definition only availble on __KERNEL__
128 if (res < 0 && errno == 515)
129 {
130 av_log(NULL, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n");
2b63c222 131 close(fd);
c16601bb
AB
132
133 return -1;
134 }
0a7b514f
LA
135 if (res < 0) {
136 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
137 strerror(errno));
2b63c222 138 close(fd);
0a7b514f
LA
139
140 return -1;
141 }
142 if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
143 av_log(NULL, AV_LOG_ERROR, "Not a video capture device\n");
2b63c222 144 close(fd);
0a7b514f
LA
145
146 return -1;
147 }
148 *capabilities = cap.capabilities;
149
150 return fd;
151}
152
24300af4 153static int device_init(int fd, int *width, int *height, int pix_fmt)
0a7b514f
LA
154{
155 struct v4l2_format fmt;
24300af4 156 int res;
0a7b514f
LA
157
158 memset(&fmt, 0, sizeof(struct v4l2_format));
159 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
24300af4
LA
160 fmt.fmt.pix.width = *width;
161 fmt.fmt.pix.height = *height;
0a7b514f
LA
162 fmt.fmt.pix.pixelformat = pix_fmt;
163 fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
24300af4
LA
164 res = ioctl(fd, VIDIOC_S_FMT, &fmt);
165 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
166 av_log(NULL, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
167 *width = fmt.fmt.pix.width;
168 *height = fmt.fmt.pix.height;
169 }
170
171 return res;
0a7b514f
LA
172}
173
174static int first_field(int fd)
175{
176 int res;
177 v4l2_std_id std;
178
179 res = ioctl(fd, VIDIOC_G_STD, &std);
180 if (res < 0) {
181 return 0;
182 }
183 if (std & V4L2_STD_NTSC) {
184 return 0;
185 }
186
187 return 1;
188}
189
190static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt)
191{
192 int i;
193
194 for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) {
195 if (fmt_conversion_table[i].ff_fmt == pix_fmt) {
196 return fmt_conversion_table[i].v4l2_fmt;
197 }
198 }
199
200 return 0;
201}
202
203static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt)
204{
205 int i;
206
207 for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) {
208 if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) {
209 return fmt_conversion_table[i].ff_fmt;
210 }
211 }
212
213 return -1;
214}
215
216static int mmap_init(struct video_data *s)
217{
218 struct v4l2_requestbuffers req;
219 int i, res;
220
221 memset(&req, 0, sizeof(struct v4l2_requestbuffers));
222 req.count = desired_video_buffers;
223 req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
224 req.memory = V4L2_MEMORY_MMAP;
225 res = ioctl (s->fd, VIDIOC_REQBUFS, &req);
226 if (res < 0) {
227 if (errno == EINVAL) {
228 av_log(NULL, AV_LOG_ERROR, "Device does not support mmap\n");
229 } else {
230 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
231 }
232
233 return -1;
234 }
235
236 if (req.count < 2) {
237 av_log(NULL, AV_LOG_ERROR, "Insufficient buffer memory\n");
238
239 return -1;
240 }
241 s->buffers = req.count;
242 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
243 if (s->buf_start == NULL) {
244 av_log(NULL, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
245
246 return -1;
247 }
248 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
249 if (s->buf_len == NULL) {
250 av_log(NULL, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
251 av_free(s->buf_start);
252
253 return -1;
254 }
255
256 for (i = 0; i < req.count; i++) {
257 struct v4l2_buffer buf;
258
259 memset(&buf, 0, sizeof(struct v4l2_buffer));
260 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
261 buf.memory = V4L2_MEMORY_MMAP;
262 buf.index = i;
263 res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf);
264 if (res < 0) {
265 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
266
267 return -1;
268 }
269
270 s->buf_len[i] = buf.length;
271 if (s->buf_len[i] < s->frame_size) {
272 av_log(NULL, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size);
273
274 return -1;
275 }
276 s->buf_start[i] = mmap (NULL, buf.length,
277 PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset);
278 if (s->buf_start[i] == MAP_FAILED) {
279 av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
280
281 return -1;
282 }
283 }
284
285 return 0;
286}
287
288static int read_init(struct video_data *s)
289{
290 return -1;
291}
292
293static int mmap_read_frame(struct video_data *s, void *frame, int64_t *ts)
294{
295 struct v4l2_buffer buf;
296 int res;
297
298 memset(&buf, 0, sizeof(struct v4l2_buffer));
299 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
300 buf.memory = V4L2_MEMORY_MMAP;
301
302 /* FIXME: Some special treatment might be needed in case of loss of signal... */
303 while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 &&
304 ((errno == EAGAIN) || (errno == EINTR)));
305 if (res < 0) {
306 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
307
308 return -1;
309 }
310 assert (buf.index < s->buffers);
7c7e7464
LA
311 if (buf.bytesused != s->frame_size) {
312 av_log(NULL, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size);
313
314 return -1;
315 }
316
0a7b514f
LA
317 /* Image is at s->buff_start[buf.index] */
318 memcpy(frame, s->buf_start[buf.index], buf.bytesused);
8da9266c 319 *ts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
0a7b514f
LA
320
321 res = ioctl (s->fd, VIDIOC_QBUF, &buf);
322 if (res < 0) {
323 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
324
325 return -1;
326 }
327
328 return s->buf_len[buf.index];
329}
330
331static int read_frame(struct video_data *s, void *frame, int64_t *ts)
332{
333 return -1;
334}
335
336static int mmap_start(struct video_data *s)
337{
338 enum v4l2_buf_type type;
339 int i, res;
340
341 for (i = 0; i < s->buffers; i++) {
342 struct v4l2_buffer buf;
343
344 memset(&buf, 0, sizeof(struct v4l2_buffer));
345 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
346 buf.memory = V4L2_MEMORY_MMAP;
347 buf.index = i;
348
349 res = ioctl (s->fd, VIDIOC_QBUF, &buf);
350 if (res < 0) {
351 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
352
353 return -1;
354 }
355 }
356
357 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
358 res = ioctl (s->fd, VIDIOC_STREAMON, &type);
359 if (res < 0) {
360 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
361
362 return -1;
363 }
364
365 return 0;
366}
367
368static void mmap_close(struct video_data *s)
369{
370 enum v4l2_buf_type type;
371 int i;
372
373 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
374 /* We do not check for the result, because we could
375 * not do anything about it anyway...
376 */
377 ioctl(s->fd, VIDIOC_STREAMOFF, &type);
378 for (i = 0; i < s->buffers; i++) {
379 munmap(s->buf_start[i], s->buf_len[i]);
380 }
381 av_free(s->buf_start);
382 av_free(s->buf_len);
383}
384
385static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
386{
387 struct video_data *s = s1->priv_data;
388 AVStream *st;
389 int width, height;
390 int res, frame_rate, frame_rate_base;
391 uint32_t desired_format, capabilities;
392 const char *video_device;
393
c04c3282 394 if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
0a7b514f
LA
395 av_log(s1, AV_LOG_ERROR, "Missing/Wrong parameters\n");
396
397 return -1;
398 }
399
400 width = ap->width;
401 height = ap->height;
402 frame_rate = ap->time_base.den;
403 frame_rate_base = ap->time_base.num;
404
405 if((unsigned)width > 32767 || (unsigned)height > 32767) {
406 av_log(s1, AV_LOG_ERROR, "Wrong size %dx%d\n", width, height);
407
408 return -1;
409 }
410
411 st = av_new_stream(s1, 0);
412 if (!st) {
413 return -ENOMEM;
414 }
415 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
416
417 s->width = width;
418 s->height = height;
419 s->frame_rate = frame_rate;
420 s->frame_rate_base = frame_rate_base;
421
422 video_device = ap->device;
423 if (!video_device) {
424 video_device = "/dev/video";
425 }
426 capabilities = 0;
427 s->fd = device_open(video_device, &capabilities);
428 if (s->fd < 0) {
429 av_free(st);
430
431 return AVERROR_IO;
432 }
60023e32 433 av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
0a7b514f
LA
434
435 desired_format = fmt_ff2v4l(ap->pix_fmt);
24300af4 436 if (desired_format == 0 || (device_init(s->fd, &width, &height, desired_format) < 0)) {
0a7b514f
LA
437 int i, done;
438
439 done = 0; i = 0;
440 while (!done) {
441 desired_format = fmt_conversion_table[i].v4l2_fmt;
24300af4 442 if (device_init(s->fd, &width, &height, desired_format) < 0) {
0a7b514f
LA
443 desired_format = 0;
444 i++;
445 } else {
446 done = 1;
447 }
448 if (i == sizeof(fmt_conversion_table) / sizeof(struct fmt_map)) {
449 done = 1;
450 }
451 }
452 }
453 if (desired_format == 0) {
454 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n");
455 close(s->fd);
456 av_free(st);
457
458 return AVERROR_IO;
459 }
460 s->frame_format = desired_format;
461
462 st->codec->pix_fmt = fmt_v4l2ff(desired_format);
463 s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height);
464 if (capabilities & V4L2_CAP_STREAMING) {
465 s->io_method = io_mmap;
466 res = mmap_init(s);
eaddc471
BA
467 if (res == 0) {
468 res = mmap_start(s);
469 }
0a7b514f
LA
470 } else {
471 s->io_method = io_read;
472 res = read_init(s);
473 }
474 if (res < 0) {
475 close(s->fd);
476 av_free(st);
477
478 return AVERROR_IO;
479 }
480 s->top_field_first = first_field(s->fd);
481
482 st->codec->codec_type = CODEC_TYPE_VIDEO;
483 st->codec->codec_id = CODEC_ID_RAWVIDEO;
484 st->codec->width = width;
485 st->codec->height = height;
486 st->codec->time_base.den = frame_rate;
487 st->codec->time_base.num = frame_rate_base;
488 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
489
490 return 0;
491}
492
493static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
494{
495 struct video_data *s = s1->priv_data;
496 int res;
497
498 if (av_new_packet(pkt, s->frame_size) < 0)
499 return AVERROR_IO;
500
501 if (s->io_method == io_mmap) {
502 res = mmap_read_frame(s, pkt->data, &pkt->pts);
503 } else if (s->io_method == io_read) {
504 res = read_frame(s, pkt->data, &pkt->pts);
505 } else {
506 return AVERROR_IO;
507 }
508 if (res < 0) {
509 return AVERROR_IO;
510 }
511
512 if (s1->streams[0]->codec->coded_frame) {
513 s1->streams[0]->codec->coded_frame->interlaced_frame = 1;
514 s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first;
515 }
516
517 return s->frame_size;
518}
519
520static int v4l2_read_close(AVFormatContext *s1)
521{
522 struct video_data *s = s1->priv_data;
523
524 if (s->io_method == io_mmap) {
525 mmap_close(s);
526 }
527
528 close(s->fd);
529 return 0;
530}
531
ff70e601 532AVInputFormat v4l2_demuxer = {
0a7b514f
LA
533 "video4linux2",
534 "video grab",
535 sizeof(struct video_data),
536 NULL,
537 v4l2_read_header,
538 v4l2_read_packet,
539 v4l2_read_close,
540 .flags = AVFMT_NOFILE,
541};