FFmpeg  4.4.4
v4l2.c
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1 /*
2  * Copyright (c) 2000,2001 Fabrice Bellard
3  * Copyright (c) 2006 Luca Abeni
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Video4Linux2 grab interface
25  *
26  * Part of this file is based on the V4L2 video capture example
27  * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html)
28  *
29  * Thanks to Michael Niedermayer for providing the mapping between
30  * V4L2_PIX_FMT_* and AV_PIX_FMT_*
31  */
32 
33 #include <stdatomic.h>
34 
35 #include "v4l2-common.h"
36 #include <dirent.h>
37 
38 #if CONFIG_LIBV4L2
39 #include <libv4l2.h>
40 #endif
41 
42 static const int desired_video_buffers = 256;
43 
44 #define V4L_ALLFORMATS 3
45 #define V4L_RAWFORMATS 1
46 #define V4L_COMPFORMATS 2
47 
48 /**
49  * Return timestamps to the user exactly as returned by the kernel
50  */
51 #define V4L_TS_DEFAULT 0
52 /**
53  * Autodetect the kind of timestamps returned by the kernel and convert to
54  * absolute (wall clock) timestamps.
55  */
56 #define V4L_TS_ABS 1
57 /**
58  * Assume kernel timestamps are from the monotonic clock and convert to
59  * absolute timestamps.
60  */
61 #define V4L_TS_MONO2ABS 2
62 
63 /**
64  * Once the kind of timestamps returned by the kernel have been detected,
65  * the value of the timefilter (NULL or not) determines whether a conversion
66  * takes place.
67  */
68 #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
69 
70 struct video_data {
71  AVClass *class;
72  int fd;
73  int pixelformat; /* V4L2_PIX_FMT_* */
74  int width, height;
78  int ts_mode;
80  int64_t last_time_m;
81 
82  int buffers;
84  void **buf_start;
85  unsigned int *buf_len;
86  char *standard;
87  v4l2_std_id std_id;
88  int channel;
89  char *pixel_format; /**< Set by a private option. */
90  int list_format; /**< Set by a private option. */
91  int list_standard; /**< Set by a private option. */
92  char *framerate; /**< Set by a private option. */
93 
95  int (*open_f)(const char *file, int oflag, ...);
96  int (*close_f)(int fd);
97  int (*dup_f)(int fd);
98 #ifdef __GLIBC__
99  int (*ioctl_f)(int fd, unsigned long int request, ...);
100 #else
101  int (*ioctl_f)(int fd, int request, ...);
102 #endif
103  ssize_t (*read_f)(int fd, void *buffer, size_t n);
104  void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset);
105  int (*munmap_f)(void *_start, size_t length);
106 };
107 
108 struct buff_data {
109  struct video_data *s;
110  int index;
111 };
112 
113 static int device_open(AVFormatContext *ctx, const char* device_path)
114 {
115  struct video_data *s = ctx->priv_data;
116  struct v4l2_capability cap;
117  int fd;
118  int err;
119  int flags = O_RDWR;
120 
121 #define SET_WRAPPERS(prefix) do { \
122  s->open_f = prefix ## open; \
123  s->close_f = prefix ## close; \
124  s->dup_f = prefix ## dup; \
125  s->ioctl_f = prefix ## ioctl; \
126  s->read_f = prefix ## read; \
127  s->mmap_f = prefix ## mmap; \
128  s->munmap_f = prefix ## munmap; \
129 } while (0)
130 
131  if (s->use_libv4l2) {
132 #if CONFIG_LIBV4L2
133  SET_WRAPPERS(v4l2_);
134 #else
135  av_log(ctx, AV_LOG_ERROR, "libavdevice is not built with libv4l2 support.\n");
136  return AVERROR(EINVAL);
137 #endif
138  } else {
139  SET_WRAPPERS();
140  }
141 
142 #define v4l2_open s->open_f
143 #define v4l2_close s->close_f
144 #define v4l2_dup s->dup_f
145 #define v4l2_ioctl s->ioctl_f
146 #define v4l2_read s->read_f
147 #define v4l2_mmap s->mmap_f
148 #define v4l2_munmap s->munmap_f
149 
150  if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
151  flags |= O_NONBLOCK;
152  }
153 
154  fd = v4l2_open(device_path, flags, 0);
155  if (fd < 0) {
156  err = AVERROR(errno);
157  av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
158  device_path, av_err2str(err));
159  return err;
160  }
161 
162  if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
163  err = AVERROR(errno);
164  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
165  av_err2str(err));
166  goto fail;
167  }
168 
169  av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
170  fd, cap.capabilities);
171 
172  if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
173  av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
174  err = AVERROR(ENODEV);
175  goto fail;
176  }
177 
178  if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
180  "The device does not support the streaming I/O method.\n");
181  err = AVERROR(ENOSYS);
182  goto fail;
183  }
184 
185  return fd;
186 
187 fail:
188  v4l2_close(fd);
189  return err;
190 }
191 
192 static int device_init(AVFormatContext *ctx, int *width, int *height,
193  uint32_t pixelformat)
194 {
195  struct video_data *s = ctx->priv_data;
196  struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
197  int res = 0;
198 
199  fmt.fmt.pix.width = *width;
200  fmt.fmt.pix.height = *height;
201  fmt.fmt.pix.pixelformat = pixelformat;
202  fmt.fmt.pix.field = V4L2_FIELD_ANY;
203 
204  /* Some drivers will fail and return EINVAL when the pixelformat
205  is not supported (even if type field is valid and supported) */
206  if (v4l2_ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0)
207  res = AVERROR(errno);
208 
209  if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
211  "The V4L2 driver changed the video from %dx%d to %dx%d\n",
212  *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
213  *width = fmt.fmt.pix.width;
214  *height = fmt.fmt.pix.height;
215  }
216 
217  if (pixelformat != fmt.fmt.pix.pixelformat) {
219  "The V4L2 driver changed the pixel format "
220  "from 0x%08X to 0x%08X\n",
221  pixelformat, fmt.fmt.pix.pixelformat);
222  res = AVERROR(EINVAL);
223  }
224 
225  if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
227  "The V4L2 driver is using the interlaced mode\n");
228  s->interlaced = 1;
229  }
230 
231  return res;
232 }
233 
234 static int first_field(const struct video_data *s)
235 {
236  int res;
237  v4l2_std_id std;
238 
239  res = v4l2_ioctl(s->fd, VIDIOC_G_STD, &std);
240  if (res < 0)
241  return 0;
242  if (std & V4L2_STD_NTSC)
243  return 0;
244 
245  return 1;
246 }
247 
248 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
249 static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat)
250 {
251  const struct video_data *s = ctx->priv_data;
252  struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
253 
254  while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
255  switch (vfse.type) {
256  case V4L2_FRMSIZE_TYPE_DISCRETE:
257  av_log(ctx, AV_LOG_INFO, " %ux%u",
258  vfse.discrete.width, vfse.discrete.height);
259  break;
260  case V4L2_FRMSIZE_TYPE_CONTINUOUS:
261  case V4L2_FRMSIZE_TYPE_STEPWISE:
262  av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
263  vfse.stepwise.min_width,
264  vfse.stepwise.max_width,
265  vfse.stepwise.step_width,
266  vfse.stepwise.min_height,
267  vfse.stepwise.max_height,
268  vfse.stepwise.step_height);
269  }
270  vfse.index++;
271  }
272 }
273 #endif
274 
276 {
277  const struct video_data *s = ctx->priv_data;
278  struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
279 
280  while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) {
281  enum AVCodecID codec_id = ff_fmt_v4l2codec(vfd.pixelformat);
282  enum AVPixelFormat pix_fmt = ff_fmt_v4l2ff(vfd.pixelformat, codec_id);
283 
284  vfd.index++;
285 
286  if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
287  type & V4L_RAWFORMATS) {
288  const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
289  av_log(ctx, AV_LOG_INFO, "Raw : %11s : %20s :",
290  fmt_name ? fmt_name : "Unsupported",
291  vfd.description);
292  } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
293  type & V4L_COMPFORMATS) {
295  av_log(ctx, AV_LOG_INFO, "Compressed: %11s : %20s :",
296  desc ? desc->name : "Unsupported",
297  vfd.description);
298  } else {
299  continue;
300  }
301 
302 #ifdef V4L2_FMT_FLAG_EMULATED
303  if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
304  av_log(ctx, AV_LOG_INFO, " Emulated :");
305 #endif
306 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
307  list_framesizes(ctx, vfd.pixelformat);
308 #endif
309  av_log(ctx, AV_LOG_INFO, "\n");
310  }
311 }
312 
314 {
315  int ret;
316  struct video_data *s = ctx->priv_data;
317  struct v4l2_standard standard;
318 
319  if (s->std_id == 0)
320  return;
321 
322  for (standard.index = 0; ; standard.index++) {
323  if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
324  ret = AVERROR(errno);
325  if (ret == AVERROR(EINVAL)) {
326  break;
327  } else {
328  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
329  return;
330  }
331  }
332  av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n",
333  standard.index, (uint64_t)standard.id, standard.name);
334  }
335 }
336 
338 {
339  int i, res;
340  struct video_data *s = ctx->priv_data;
341  struct v4l2_requestbuffers req = {
342  .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
343  .count = desired_video_buffers,
344  .memory = V4L2_MEMORY_MMAP
345  };
346 
347  if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
348  res = AVERROR(errno);
349  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
350  return res;
351  }
352 
353  if (req.count < 2) {
354  av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
355  return AVERROR(ENOMEM);
356  }
357  s->buffers = req.count;
358  s->buf_start = av_malloc_array(s->buffers, sizeof(void *));
359  if (!s->buf_start) {
360  av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
361  return AVERROR(ENOMEM);
362  }
363  s->buf_len = av_malloc_array(s->buffers, sizeof(unsigned int));
364  if (!s->buf_len) {
365  av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
366  av_freep(&s->buf_start);
367  return AVERROR(ENOMEM);
368  }
369 
370  for (i = 0; i < req.count; i++) {
371  struct v4l2_buffer buf = {
372  .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
373  .index = i,
374  .memory = V4L2_MEMORY_MMAP
375  };
376  if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
377  res = AVERROR(errno);
378  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
379  return res;
380  }
381 
382  s->buf_len[i] = buf.length;
383  if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
385  "buf_len[%d] = %d < expected frame size %d\n",
386  i, s->buf_len[i], s->frame_size);
387  return AVERROR(ENOMEM);
388  }
389  s->buf_start[i] = v4l2_mmap(NULL, buf.length,
390  PROT_READ | PROT_WRITE, MAP_SHARED,
391  s->fd, buf.m.offset);
392 
393  if (s->buf_start[i] == MAP_FAILED) {
394  res = AVERROR(errno);
395  av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
396  return res;
397  }
398  }
399 
400  return 0;
401 }
402 
403 static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
404 {
405  int res = 0;
406 
407  if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) {
408  res = AVERROR(errno);
409  av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
410  } else {
411  atomic_fetch_add(&s->buffers_queued, 1);
412  }
413 
414  return res;
415 }
416 
417 static void mmap_release_buffer(void *opaque, uint8_t *data)
418 {
419  struct v4l2_buffer buf = { 0 };
420  struct buff_data *buf_descriptor = opaque;
421  struct video_data *s = buf_descriptor->s;
422 
423  buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
424  buf.memory = V4L2_MEMORY_MMAP;
425  buf.index = buf_descriptor->index;
426  av_free(buf_descriptor);
427 
428  enqueue_buffer(s, &buf);
429 }
430 
431 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
432 static int64_t av_gettime_monotonic(void)
433 {
434  return av_gettime_relative();
435 }
436 #endif
437 
439 {
440  struct video_data *s = ctx->priv_data;
441  int64_t now;
442 
443  now = av_gettime();
444  if (s->ts_mode == V4L_TS_ABS &&
445  ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
446  av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
447  s->ts_mode = V4L_TS_CONVERT_READY;
448  return 0;
449  }
450 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
451  if (ctx->streams[0]->avg_frame_rate.num) {
452  now = av_gettime_monotonic();
453  if (s->ts_mode == V4L_TS_MONO2ABS ||
454  (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
455  AVRational tb = {AV_TIME_BASE, 1};
456  int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
457  av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
458  /* microseconds instead of seconds, MHz instead of Hz */
459  s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
460  if (!s->timefilter)
461  return AVERROR(ENOMEM);
462  s->ts_mode = V4L_TS_CONVERT_READY;
463  return 0;
464  }
465  }
466 #endif
467  av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
468  return AVERROR(EIO);
469 }
470 
471 static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
472 {
473  struct video_data *s = ctx->priv_data;
474 
475  if (s->ts_mode) {
476  int r = init_convert_timestamp(ctx, *ts);
477  if (r < 0)
478  return r;
479  }
480 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
481  if (s->timefilter) {
482  int64_t nowa = av_gettime();
483  int64_t nowm = av_gettime_monotonic();
484  ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
485  s->last_time_m = nowm;
486  *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
487  }
488 #endif
489  return 0;
490 }
491 
493 {
494  struct video_data *s = ctx->priv_data;
495  struct v4l2_buffer buf = {
496  .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
497  .memory = V4L2_MEMORY_MMAP
498  };
499  struct timeval buf_ts;
500  int res;
501 
502  pkt->size = 0;
503 
504  /* FIXME: Some special treatment might be needed in case of loss of signal... */
505  while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
506  if (res < 0) {
507  if (errno == EAGAIN)
508  return AVERROR(EAGAIN);
509 
510  res = AVERROR(errno);
511  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
512  av_err2str(res));
513  return res;
514  }
515 
516  buf_ts = buf.timestamp;
517 
518  if (buf.index >= s->buffers) {
519  av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
520  return AVERROR(EINVAL);
521  }
522  atomic_fetch_add(&s->buffers_queued, -1);
523  // always keep at least one buffer queued
524  av_assert0(atomic_load(&s->buffers_queued) >= 1);
525 
526 #ifdef V4L2_BUF_FLAG_ERROR
527  if (buf.flags & V4L2_BUF_FLAG_ERROR) {
529  "Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
530  buf.bytesused);
531  buf.bytesused = 0;
532  } else
533 #endif
534  {
535  /* CPIA is a compressed format and we don't know the exact number of bytes
536  * used by a frame, so set it here as the driver announces it. */
538  s->frame_size = buf.bytesused;
539 
540  if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
542  "Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
543  buf.bytesused, s->frame_size, buf.flags);
544  buf.bytesused = 0;
545  }
546  }
547 
548  /* Image is at s->buff_start[buf.index] */
549  if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
550  /* when we start getting low on queued buffers, fall back on copying data */
551  res = av_new_packet(pkt, buf.bytesused);
552  if (res < 0) {
553  av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
554  enqueue_buffer(s, &buf);
555  return res;
556  }
557  memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
558 
559  res = enqueue_buffer(s, &buf);
560  if (res) {
562  return res;
563  }
564  } else {
565  struct buff_data *buf_descriptor;
566 
567  pkt->data = s->buf_start[buf.index];
568  pkt->size = buf.bytesused;
569 
570  buf_descriptor = av_malloc(sizeof(struct buff_data));
571  if (!buf_descriptor) {
572  /* Something went wrong... Since av_malloc() failed, we cannot even
573  * allocate a buffer for memcpying into it
574  */
575  av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
576  enqueue_buffer(s, &buf);
577 
578  return AVERROR(ENOMEM);
579  }
580  buf_descriptor->index = buf.index;
581  buf_descriptor->s = s;
582 
584  buf_descriptor, 0);
585  if (!pkt->buf) {
586  av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
587  enqueue_buffer(s, &buf);
588  av_freep(&buf_descriptor);
589  return AVERROR(ENOMEM);
590  }
591  }
592  pkt->pts = buf_ts.tv_sec * INT64_C(1000000) + buf_ts.tv_usec;
594 
595  return pkt->size;
596 }
597 
599 {
600  struct video_data *s = ctx->priv_data;
601  enum v4l2_buf_type type;
602  int i, res;
603 
604  for (i = 0; i < s->buffers; i++) {
605  struct v4l2_buffer buf = {
606  .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
607  .index = i,
608  .memory = V4L2_MEMORY_MMAP
609  };
610 
611  if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
612  res = AVERROR(errno);
613  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
614  av_err2str(res));
615  return res;
616  }
617  }
618  atomic_store(&s->buffers_queued, s->buffers);
619 
620  type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
621  if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
622  res = AVERROR(errno);
623  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
624  av_err2str(res));
625  return res;
626  }
627 
628  return 0;
629 }
630 
631 static void mmap_close(struct video_data *s)
632 {
633  enum v4l2_buf_type type;
634  int i;
635 
636  type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
637  /* We do not check for the result, because we could
638  * not do anything about it anyway...
639  */
640  v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
641  for (i = 0; i < s->buffers; i++) {
642  v4l2_munmap(s->buf_start[i], s->buf_len[i]);
643  }
644  av_freep(&s->buf_start);
645  av_freep(&s->buf_len);
646 }
647 
649 {
650  struct video_data *s = ctx->priv_data;
651  struct v4l2_standard standard = { 0 };
652  struct v4l2_streamparm streamparm = { 0 };
653  struct v4l2_fract *tpf;
654  AVRational framerate_q = { 0 };
655  int i, ret;
656 
657  if (s->framerate &&
658  (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
659  av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
660  s->framerate);
661  return ret;
662  }
663 
664  if (s->standard) {
665  if (s->std_id) {
666  ret = 0;
667  av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
668  /* set tv standard */
669  for (i = 0; ; i++) {
670  standard.index = i;
671  if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
672  ret = AVERROR(errno);
673  break;
674  }
675  if (!av_strcasecmp(standard.name, s->standard))
676  break;
677  }
678  if (ret < 0) {
679  av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
680  return ret;
681  }
682 
683  if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
684  ret = AVERROR(errno);
685  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
686  return ret;
687  }
688  } else {
690  "This device does not support any standard\n");
691  }
692  }
693 
694  /* get standard */
695  if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
696  tpf = &standard.frameperiod;
697  for (i = 0; ; i++) {
698  standard.index = i;
699  if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
700  ret = AVERROR(errno);
701  if (ret == AVERROR(EINVAL)
702 #ifdef ENODATA
703  || ret == AVERROR(ENODATA)
704 #endif
705  ) {
706  tpf = &streamparm.parm.capture.timeperframe;
707  break;
708  }
709  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
710  return ret;
711  }
712  if (standard.id == s->std_id) {
714  "Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
715  standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
716  break;
717  }
718  }
719  } else {
720  tpf = &streamparm.parm.capture.timeperframe;
721  }
722 
723  streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
724  if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
725  ret = AVERROR(errno);
726  av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
727  } else if (framerate_q.num && framerate_q.den) {
728  if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
729  tpf = &streamparm.parm.capture.timeperframe;
730 
731  av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
732  framerate_q.den, framerate_q.num);
733  tpf->numerator = framerate_q.den;
734  tpf->denominator = framerate_q.num;
735 
736  if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
737  ret = AVERROR(errno);
738  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n",
739  av_err2str(ret));
740  return ret;
741  }
742 
743  if (framerate_q.num != tpf->denominator ||
744  framerate_q.den != tpf->numerator) {
746  "The driver changed the time per frame from "
747  "%d/%d to %d/%d\n",
748  framerate_q.den, framerate_q.num,
749  tpf->numerator, tpf->denominator);
750  }
751  } else {
753  "The driver does not permit changing the time per frame\n");
754  }
755  }
756  if (tpf->denominator > 0 && tpf->numerator > 0) {
757  ctx->streams[0]->avg_frame_rate.num = tpf->denominator;
758  ctx->streams[0]->avg_frame_rate.den = tpf->numerator;
760  } else
761  av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n");
762 
763  return 0;
764 }
765 
767  enum AVPixelFormat pix_fmt,
768  int *width,
769  int *height,
770  uint32_t *desired_format,
771  enum AVCodecID *codec_id)
772 {
773  int ret, i;
774 
775  *desired_format = ff_fmt_ff2v4l(pix_fmt, ctx->video_codec_id);
776 
777  if (*desired_format) {
778  ret = device_init(ctx, width, height, *desired_format);
779  if (ret < 0) {
780  *desired_format = 0;
781  if (ret != AVERROR(EINVAL))
782  return ret;
783  }
784  }
785 
786  if (!*desired_format) {
790  av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
792  (char *)av_x_if_null(av_get_pix_fmt_name(ff_fmt_conversion_table[i].ff_fmt), "none"));
793 
794  *desired_format = ff_fmt_conversion_table[i].v4l2_fmt;
795  ret = device_init(ctx, width, height, *desired_format);
796  if (ret >= 0)
797  break;
798  else if (ret != AVERROR(EINVAL))
799  return ret;
800  *desired_format = 0;
801  }
802  }
803 
804  if (*desired_format == 0) {
805  av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for "
806  "codec '%s' (id %d), pixel format '%s' (id %d)\n",
808  (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
809  ret = AVERROR(EINVAL);
810  }
811  }
812 
813  *codec_id = ff_fmt_v4l2codec(*desired_format);
814  if (*codec_id == AV_CODEC_ID_NONE)
815  av_assert0(ret == AVERROR(EINVAL));
816  return ret;
817 }
818 
819 static int v4l2_read_probe(const AVProbeData *p)
820 {
821  if (av_strstart(p->filename, "/dev/video", NULL))
822  return AVPROBE_SCORE_MAX - 1;
823  return 0;
824 }
825 
827 {
828  struct video_data *s = ctx->priv_data;
829  AVStream *st;
830  int res = 0;
831  uint32_t desired_format;
834  struct v4l2_input input = { 0 };
835 
837  if (!st)
838  return AVERROR(ENOMEM);
839 
840 #if CONFIG_LIBV4L2
841  /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
842  and errors will get sent to stderr */
843  if (s->use_libv4l2)
844  v4l2_log_file = fopen("/dev/null", "w");
845 #endif
846 
847  s->fd = device_open(ctx, ctx->url);
848  if (s->fd < 0)
849  return s->fd;
850 
851  if (s->channel != -1) {
852  /* set video input */
853  av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
854  if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
855  res = AVERROR(errno);
856  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
857  goto fail;
858  }
859  } else {
860  /* get current video input */
861  if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
862  res = AVERROR(errno);
863  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
864  goto fail;
865  }
866  }
867 
868  /* enum input */
869  input.index = s->channel;
870  if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
871  res = AVERROR(errno);
872  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
873  goto fail;
874  }
875  s->std_id = input.std;
876  av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
877  s->channel, input.name, (uint64_t)input.std);
878 
879  if (s->list_format) {
880  list_formats(ctx, s->list_format);
881  res = AVERROR_EXIT;
882  goto fail;
883  }
884 
885  if (s->list_standard) {
887  res = AVERROR_EXIT;
888  goto fail;
889  }
890 
891  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
892 
893  if (s->pixel_format) {
894  const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(s->pixel_format);
895 
896  if (desc)
897  ctx->video_codec_id = desc->id;
898 
899  pix_fmt = av_get_pix_fmt(s->pixel_format);
900 
901  if (pix_fmt == AV_PIX_FMT_NONE && !desc) {
902  av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n",
903  s->pixel_format);
904 
905  res = AVERROR(EINVAL);
906  goto fail;
907  }
908  }
909 
910  if (!s->width && !s->height) {
911  struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
912 
914  "Querying the device for the current frame size\n");
915  if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
916  res = AVERROR(errno);
917  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
918  av_err2str(res));
919  goto fail;
920  }
921 
922  s->width = fmt.fmt.pix.width;
923  s->height = fmt.fmt.pix.height;
925  "Setting frame size to %dx%d\n", s->width, s->height);
926  }
927 
928  res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
929  if (res < 0)
930  goto fail;
931 
932  /* If no pixel_format was specified, the codec_id was not known up
933  * until now. Set video_codec_id in the context, as codec_id will
934  * not be available outside this function
935  */
938 
939  if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0)
940  goto fail;
941 
942  s->pixelformat = desired_format;
943 
944  if ((res = v4l2_set_parameters(ctx)) < 0)
945  goto fail;
946 
947  st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
948  if (st->codecpar->format != AV_PIX_FMT_NONE)
949  s->frame_size = av_image_get_buffer_size(st->codecpar->format,
950  s->width, s->height, 1);
951 
952  if ((res = mmap_init(ctx)) ||
953  (res = mmap_start(ctx)) < 0)
954  goto fail;
955 
956  s->top_field_first = first_field(s);
957 
959  st->codecpar->codec_id = codec_id;
961  st->codecpar->codec_tag =
963  else if (codec_id == AV_CODEC_ID_H264) {
965  }
966  if (desired_format == V4L2_PIX_FMT_YVU420)
967  st->codecpar->codec_tag = MKTAG('Y', 'V', '1', '2');
968  else if (desired_format == V4L2_PIX_FMT_YVU410)
969  st->codecpar->codec_tag = MKTAG('Y', 'V', 'U', '9');
970  st->codecpar->width = s->width;
971  st->codecpar->height = s->height;
972  if (st->avg_frame_rate.den)
973  st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
974 
975  return 0;
976 
977 fail:
978  v4l2_close(s->fd);
979  return res;
980 }
981 
983 {
984 #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
986  struct video_data *s = ctx->priv_data;
989 #endif
990  int res;
991 
992  if ((res = mmap_read_frame(ctx, pkt)) < 0) {
993  return res;
994  }
995 
996 #if FF_API_CODED_FRAME && FF_API_LAVF_AVCTX
998  if (frame && s->interlaced) {
999  frame->interlaced_frame = 1;
1000  frame->top_field_first = s->top_field_first;
1001  }
1003 #endif
1004 
1005  return pkt->size;
1006 }
1007 
1009 {
1010  struct video_data *s = ctx->priv_data;
1011 
1012  if (atomic_load(&s->buffers_queued) != s->buffers)
1013  av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
1014  "close.\n");
1015 
1016  mmap_close(s);
1017 
1018  v4l2_close(s->fd);
1019  return 0;
1020 }
1021 
1022 static int v4l2_is_v4l_dev(const char *name)
1023 {
1024  return !strncmp(name, "video", 5) ||
1025  !strncmp(name, "radio", 5) ||
1026  !strncmp(name, "vbi", 3) ||
1027  !strncmp(name, "v4l-subdev", 10);
1028 }
1029 
1031 {
1032  struct video_data *s = ctx->priv_data;
1033  DIR *dir;
1034  struct dirent *entry;
1035  AVDeviceInfo *device = NULL;
1036  struct v4l2_capability cap;
1037  int ret = 0;
1038 
1039  if (!device_list)
1040  return AVERROR(EINVAL);
1041 
1042  dir = opendir("/dev");
1043  if (!dir) {
1044  ret = AVERROR(errno);
1045  av_log(ctx, AV_LOG_ERROR, "Couldn't open the directory: %s\n", av_err2str(ret));
1046  return ret;
1047  }
1048  while ((entry = readdir(dir))) {
1049  char device_name[256];
1050 
1051  if (!v4l2_is_v4l_dev(entry->d_name))
1052  continue;
1053 
1054  snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
1055  if ((s->fd = device_open(ctx, device_name)) < 0)
1056  continue;
1057 
1058  if (v4l2_ioctl(s->fd, VIDIOC_QUERYCAP, &cap) < 0) {
1059  ret = AVERROR(errno);
1060  av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", av_err2str(ret));
1061  goto fail;
1062  }
1063 
1064  device = av_mallocz(sizeof(AVDeviceInfo));
1065  if (!device) {
1066  ret = AVERROR(ENOMEM);
1067  goto fail;
1068  }
1069  device->device_name = av_strdup(device_name);
1070  device->device_description = av_strdup(cap.card);
1071  if (!device->device_name || !device->device_description) {
1072  ret = AVERROR(ENOMEM);
1073  goto fail;
1074  }
1075 
1076  if ((ret = av_dynarray_add_nofree(&device_list->devices,
1077  &device_list->nb_devices, device)) < 0)
1078  goto fail;
1079 
1080  v4l2_close(s->fd);
1081  s->fd = -1;
1082  continue;
1083 
1084  fail:
1085  if (device) {
1086  av_freep(&device->device_name);
1087  av_freep(&device->device_description);
1088  av_freep(&device);
1089  }
1090  if (s->fd >= 0)
1091  v4l2_close(s->fd);
1092  s->fd = -1;
1093  break;
1094  }
1095  closedir(dir);
1096  return ret;
1097 }
1098 
1099 #define OFFSET(x) offsetof(struct video_data, x)
1100 #define DEC AV_OPT_FLAG_DECODING_PARAM
1101 
1102 static const AVOption options[] = {
1103  { "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
1104  { "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
1105  { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
1106  { "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1107  { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1108  { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1109 
1110  { "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
1111  { "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
1112  { "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
1113  { "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
1114 
1115  { "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, "list_standards" },
1116  { "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, "list_standards" },
1117 
1118  { "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" },
1119  { "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" },
1120  { "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" },
1121  { "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, "timestamps" },
1122  { "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
1123  { "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1124  { NULL },
1125 };
1126 
1127 static const AVClass v4l2_class = {
1128  .class_name = "V4L2 indev",
1129  .item_name = av_default_item_name,
1130  .option = options,
1131  .version = LIBAVUTIL_VERSION_INT,
1133 };
1134 
1136  .name = "video4linux2,v4l2",
1137  .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
1138  .priv_data_size = sizeof(struct video_data),
1140  .read_header = v4l2_read_header,
1141  .read_packet = v4l2_read_packet,
1142  .read_close = v4l2_read_close,
1143  .get_device_list = v4l2_get_device_list,
1144  .flags = AVFMT_NOFILE,
1145  .priv_class = &v4l2_class,
1146 };
uint8_t
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVFMT_FLAG_NONBLOCK
Do not block when reading packets from input.
Definition: avformat.h:1366
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
@ AVSTREAM_PARSE_FULL_ONCE
full parsing and repack of the first frame only, only implemented for H.264 currently
Definition: avformat.h:797
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
#define fail()
Definition: checkasm.h:133
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define FFMAX(a, b)
Definition: common.h:103
#define NULL
Definition: coverity.c:32
static enum AVPixelFormat pix_fmt
static AVFrame * frame
#define atomic_store(object, desired)
Definition: stdatomic.h:85
intptr_t atomic_int
Definition: stdatomic.h:55
#define atomic_load(object)
Definition: stdatomic.h:93
channel
Use these values when setting the channel map with ebur128_set_channel().
Definition: ebur128.h:39
int
#define atomic_fetch_add(object, operand)
Definition: stdatomic.h:131
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_BOOL
Definition: opt.h:242
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
Definition: codec_desc.c:3516
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:477
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3501
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
@ AV_CODEC_ID_H264
Definition: codec_id.h:76
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_CPIA
Definition: codec_id.h:260
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt,...
Definition: raw.c:305
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
AVBufferRef * av_buffer_create(uint8_t *data, buffer_size_t size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:29
#define AVERROR_EXIT
Immediate exit was requested; the called function should not be restarted.
Definition: error.h:56
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:119
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
#define AV_LOG_VERBOSE
Detailed information.
Definition: log.h:210
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
static double av_q2d(AVRational a)
Convert an AVRational to a double.
Definition: rational.h:104
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int av_dynarray_add_nofree(void *tab_ptr, int *nb_ptr, void *elem)
Add an element to a dynamic array.
Definition: mem.c:296
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:308
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters.
Definition: imgutils.c:466
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:317
int av_strcasecmp(const char *a, const char *b)
Locale-independent case-insensitive compare.
Definition: avstring.c:215
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
cl_device_type type
int i
Definition: input.c:407
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4945
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:83
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:84
const char * desc
Definition: libsvtav1.c:79
@ AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
Definition: log.h:42
const char data[16]
Definition: mxf.c:142
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:179
enum AVPixelFormat av_get_pix_fmt(const char *name)
Return the pixel format corresponding to name.
Definition: pixdesc.c:2501
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Definition: pixdesc.c:2489
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
const char * name
Definition: qsvenc.c:46
#define tb
Definition: regdef.h:68
static char buffer[20]
Definition: seek.c:32
#define snprintf
Definition: snprintf.h:34
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:1764
This struct describes the properties of a single codec described by an AVCodecID.
Definition: codec_desc.h:38
int width
Video only.
Definition: codec_par.h:126
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
List of devices.
Definition: avdevice.h:465
int nb_devices
number of autodetected devices
Definition: avdevice.h:467
AVDeviceInfo ** devices
list of autodetected devices
Definition: avdevice.h:466
Structure describes basic parameters of the device.
Definition: avdevice.h:457
char * device_description
human friendly name
Definition: avdevice.h:459
char * device_name
device name, format depends on device
Definition: avdevice.h:458
Format I/O context.
Definition: avformat.h:1232
int flags
Flags modifying the (de)muxer behaviour.
Definition: avformat.h:1363
char * url
input or output URL.
Definition: avformat.h:1328
enum AVCodecID video_codec_id
Forced video codec_id.
Definition: avformat.h:1420
void * priv_data
Format private data.
Definition: avformat.h:1260
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1300
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
int top_field_first
If the content is interlaced, is top field displayed first.
Definition: frame.h:470
int interlaced_frame
The content of the picture is interlaced.
Definition: frame.h:465
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
AVOption.
Definition: opt.h:248
This structure stores compressed data.
Definition: packet.h:346
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:352
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
const char * filename
Definition: avformat.h:442
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
attribute_deprecated AVCodecContext * codec
Definition: avformat.h:886
enum AVStreamParseType need_parsing
Definition: avformat.h:1081
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1015
Opaque type representing a time filter state.
Definition: timefilter.c:30
int index
Definition: v4l2.c:110
struct video_data * s
Definition: v4l2.c:109
enum AVCodecID codec_id
Definition: v4l2-common.h:51
uint32_t v4l2_fmt
Definition: v4l2-common.h:52
v4l2_std_id std_id
Definition: v4l2.c:87
char * standard
Definition: v4l2.c:86
int channel
Definition: v4l2.c:88
int width
Definition: v4l2.c:74
int height
Definition: v4l2.c:74
char * framerate
Set by a private option.
Definition: v4l2.c:92
int list_standard
Set by a private option.
Definition: v4l2.c:91
int buffers
Definition: v4l2.c:82
int ts_mode
Definition: v4l2.c:78
int frame_size
Definition: v4l2.c:75
unsigned int * buf_len
Definition: v4l2.c:85
char * pixel_format
Set by a private option.
Definition: v4l2.c:89
int(* munmap_f)(void *_start, size_t length)
Definition: v4l2.c:105
ssize_t(* read_f)(int fd, void *buffer, size_t n)
Definition: v4l2.c:103
atomic_int buffers_queued
Definition: v4l2.c:83
void ** buf_start
Definition: v4l2.c:84
int(* ioctl_f)(int fd, int request,...)
Definition: v4l2.c:101
int interlaced
Definition: v4l2.c:76
TimeFilter * timefilter
Definition: v4l2.c:79
int(* open_f)(const char *file, int oflag,...)
Definition: v4l2.c:95
int64_t last_time_m
Definition: v4l2.c:80
int top_field_first
Definition: v4l2.c:77
int use_libv4l2
Definition: v4l2.c:94
int(* close_f)(int fd)
Definition: v4l2.c:96
int(* dup_f)(int fd)
Definition: v4l2.c:97
int pixelformat
Definition: v4l2.c:73
int fd
Definition: v4l2.c:72
int list_format
Set by a private option.
Definition: v4l2.c:90
#define av_free(p)
#define av_malloc_array(a, b)
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
int framerate
Definition: h264_levels.c:65
AVPacket * pkt
Definition: movenc.c:59
AVFormatContext * ctx
Definition: movenc.c:48
#define height
#define width
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
double ff_timefilter_eval(TimeFilter *self, double delta)
Evaluate the filter at a specified time.
Definition: timefilter.c:88
double ff_timefilter_update(TimeFilter *self, double system_time, double period)
Update the filter.
Definition: timefilter.c:72
TimeFilter * ff_timefilter_new(double time_base, double period, double bandwidth)
Create a new Delay Locked Loop time filter.
Definition: timefilter.c:46
const struct fmt_map ff_fmt_conversion_table[]
Definition: v4l2-common.c:21
enum AVCodecID ff_fmt_v4l2codec(uint32_t v4l2_fmt)
Definition: v4l2-common.c:103
enum AVPixelFormat ff_fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id)
Definition: v4l2-common.c:89
uint32_t ff_fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id)
Definition: v4l2-common.c:73
static int device_try_init(AVFormatContext *ctx, enum AVPixelFormat pix_fmt, int *width, int *height, uint32_t *desired_format, enum AVCodecID *codec_id)
Definition: v4l2.c:766
static int mmap_start(AVFormatContext *ctx)
Definition: v4l2.c:598
#define SET_WRAPPERS(prefix)
#define v4l2_munmap
#define V4L_TS_MONO2ABS
Assume kernel timestamps are from the monotonic clock and convert to absolute timestamps.
Definition: v4l2.c:61
static void mmap_release_buffer(void *opaque, uint8_t *data)
Definition: v4l2.c:417
static const int desired_video_buffers
Definition: v4l2.c:42
#define V4L_RAWFORMATS
Definition: v4l2.c:45
static const AVOption options[]
Definition: v4l2.c:1102
static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
Definition: v4l2.c:438
static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
Definition: v4l2.c:471
static int v4l2_is_v4l_dev(const char *name)
Definition: v4l2.c:1022
static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_list)
Definition: v4l2.c:1030
#define v4l2_open
static const AVClass v4l2_class
Definition: v4l2.c:1127
static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
Definition: v4l2.c:403
static int mmap_init(AVFormatContext *ctx)
Definition: v4l2.c:337
#define v4l2_close
#define v4l2_mmap
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
Definition: v4l2.c:492
static int v4l2_read_close(AVFormatContext *ctx)
Definition: v4l2.c:1008
#define V4L_ALLFORMATS
Definition: v4l2.c:44
static void list_standards(AVFormatContext *ctx)
Definition: v4l2.c:313
static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: v4l2.c:982
#define V4L_TS_ABS
Autodetect the kind of timestamps returned by the kernel and convert to absolute (wall clock) timesta...
Definition: v4l2.c:56
static int first_field(const struct video_data *s)
Definition: v4l2.c:234
static void list_formats(AVFormatContext *ctx, int type)
Definition: v4l2.c:275
#define V4L_TS_DEFAULT
Return timestamps to the user exactly as returned by the kernel.
Definition: v4l2.c:51
static int v4l2_read_probe(const AVProbeData *p)
Definition: v4l2.c:819
#define V4L_COMPFORMATS
Definition: v4l2.c:46
#define V4L_TS_CONVERT_READY
Once the kind of timestamps returned by the kernel have been detected, the value of the timefilter (N...
Definition: v4l2.c:68
#define OFFSET(x)
Definition: v4l2.c:1099
static int v4l2_read_header(AVFormatContext *ctx)
Definition: v4l2.c:826
static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t pixelformat)
Definition: v4l2.c:192
static int v4l2_set_parameters(AVFormatContext *ctx)
Definition: v4l2.c:648
#define v4l2_ioctl
AVInputFormat ff_v4l2_demuxer
Definition: v4l2.c:1135
static void mmap_close(struct video_data *s)
Definition: v4l2.c:631
static int device_open(AVFormatContext *ctx, const char *device_path)
Definition: v4l2.c:113
#define DEC
Definition: v4l2.c:1100
enum AVCodecID codec_id
Definition: vaapi_decode.c:369
const char * r
Definition: vf_curves.c:116
static const uint8_t offset[127][2]
Definition: vf_spp.c:107