FFmpeg coverage

Line	Branch	Exec	Source
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 "libavutil/avassert.h"
36			#include "libavutil/avstring.h"
37			#include "libavutil/imgutils.h"
38			#include "libavutil/mem.h"
39			#include "libavutil/parseutils.h"
40			#include "libavutil/pixdesc.h"
41			#include "libavutil/time.h"
42			#include "libavcodec/avcodec.h"
43			#include "libavcodec/codec_desc.h"
44			#include "libavformat/demux.h"
45			#include "libavformat/internal.h"
46			#include "avdevice.h"
47			#include "timefilter.h"
48			#include "v4l2-common.h"
49			#include <dirent.h>
50
51			#if CONFIG_LIBV4L2
52			#include <libv4l2.h>
53			#endif
54
55			static const int desired_video_buffers = 256;
56
57			#define V4L_ALLFORMATS 3
58			#define V4L_RAWFORMATS 1
59			#define V4L_COMPFORMATS 2
60
61			/**
62			* Return timestamps to the user exactly as returned by the kernel
63			*/
64			#define V4L_TS_DEFAULT 0
65			/**
66			* Autodetect the kind of timestamps returned by the kernel and convert to
67			* absolute (wall clock) timestamps.
68			*/
69			#define V4L_TS_ABS 1
70			/**
71			* Assume kernel timestamps are from the monotonic clock and convert to
72			* absolute timestamps.
73			*/
74			#define V4L_TS_MONO2ABS 2
75
76			/**
77			* Once the kind of timestamps returned by the kernel have been detected,
78			* the value of the timefilter (NULL or not) determines whether a conversion
79			* takes place.
80			*/
81			#define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
82
83			struct video_data {
84			AVClass *class;
85			int fd;
86			int pixelformat; /* V4L2_PIX_FMT_* */
87			int width, height;
88			int frame_size;
89			int interlaced;
90			int top_field_first;
91			int ts_mode;
92			TimeFilter *timefilter;
93			int64_t last_time_m;
94
95			int multiplanar;
96			enum v4l2_buf_type buf_type;
97
98			int buffers;
99			atomic_int buffers_queued;
100			void **buf_start;
101			unsigned int *buf_len;
102			char *standard;
103			v4l2_std_id std_id;
104			int channel;
105			char *pixel_format; /**< Set by a private option. */
106			int list_format; /**< Set by a private option. */
107			int list_standard; /**< Set by a private option. */
108			char *framerate; /**< Set by a private option. */
109
110			int use_libv4l2;
111			int (*open_f)(const char *file, int oflag, ...);
112			int (*close_f)(int fd);
113			int (*dup_f)(int fd);
114			#if defined(__sun) || defined(__BIONIC__) || defined(__musl__) /* POSIX-like */
115			int (*ioctl_f)(int fd, int request, ...);
116			#else
117			int (*ioctl_f)(int fd, unsigned long int request, ...);
118			#endif
119			ssize_t (*read_f)(int fd, void *buffer, size_t n);
120			void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset);
121			int (*munmap_f)(void *_start, size_t length);
122			};
123
124			struct buff_data {
125			struct video_data *s;
126			int index;
127			};
128
129		✗	static int device_open(AVFormatContext *ctx, const char* device_path)
130			{
131		✗	struct video_data *s = ctx->priv_data;
132			struct v4l2_capability cap;
133			int fd;
134			int err;
135		✗	int flags = O_RDWR;
136
137			#define SET_WRAPPERS(prefix) do { \
138			s->open_f = prefix ## open; \
139			s->close_f = prefix ## close; \
140			s->dup_f = prefix ## dup; \
141			s->ioctl_f = prefix ## ioctl; \
142			s->read_f = prefix ## read; \
143			s->mmap_f = prefix ## mmap; \
144			s->munmap_f = prefix ## munmap; \
145			} while (0)
146
147		✗	if (s->use_libv4l2) {
148			#if CONFIG_LIBV4L2
149			SET_WRAPPERS(v4l2_);
150			#else
151		✗	av_log(ctx, AV_LOG_ERROR, "libavdevice is not built with libv4l2 support.\n");
152		✗	return AVERROR(EINVAL);
153			#endif
154			} else {
155		✗	SET_WRAPPERS();
156			}
157
158			#define v4l2_open s->open_f
159			#define v4l2_close s->close_f
160			#define v4l2_dup s->dup_f
161			#define v4l2_ioctl s->ioctl_f
162			#define v4l2_read s->read_f
163			#define v4l2_mmap s->mmap_f
164			#define v4l2_munmap s->munmap_f
165
166		✗	if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
167		✗	flags |= O_NONBLOCK;
168			}
169
170		✗	fd = v4l2_open(device_path, flags, 0);
171		✗	if (fd < 0) {
172		✗	err = AVERROR(errno);
173		✗	av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
174		✗	device_path, av_err2str(err));
175		✗	return err;
176			}
177
178		✗	if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
179		✗	err = AVERROR(errno);
180		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
181		✗	av_err2str(err));
182		✗	goto fail;
183			}
184
185		✗	av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
186			fd, cap.capabilities);
187
188		✗	if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
189		✗	s->multiplanar = 0;
190		✗	s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
191		✗	} else if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) {
192		✗	s->multiplanar = 1;
193		✗	s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
194			} else {
195		✗	av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
196		✗	err = AVERROR(ENODEV);
197		✗	goto fail;
198			}
199
200		✗	if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
201		✗	av_log(ctx, AV_LOG_ERROR,
202			"The device does not support the streaming I/O method.\n");
203		✗	err = AVERROR(ENOSYS);
204		✗	goto fail;
205			}
206
207		✗	return fd;
208
209		✗	fail:
210		✗	v4l2_close(fd);
211		✗	return err;
212			}
213
214		✗	static int device_init(AVFormatContext *ctx, int *width, int *height,
215			uint32_t pixelformat)
216			{
217		✗	struct video_data *s = ctx->priv_data;
218		✗	struct v4l2_format fmt = { .type = s->buf_type };
219		✗	int res = 0;
220
221		✗	fmt.fmt.pix.width = *width;
222		✗	fmt.fmt.pix.height = *height;
223		✗	fmt.fmt.pix.pixelformat = pixelformat;
224		✗	fmt.fmt.pix.field = V4L2_FIELD_ANY;
225
226			/* Some drivers will fail and return EINVAL when the pixelformat
227			is not supported (even if type field is valid and supported) */
228		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0)
229		✗	res = AVERROR(errno);
230
231		✗	if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
232		✗	av_log(ctx, AV_LOG_INFO,
233			"The V4L2 driver changed the video from %dx%d to %dx%d\n",
234			*width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
235		✗	*width = fmt.fmt.pix.width;
236		✗	*height = fmt.fmt.pix.height;
237			}
238
239		✗	if (pixelformat != fmt.fmt.pix.pixelformat) {
240		✗	av_log(ctx, AV_LOG_DEBUG,
241			"The V4L2 driver changed the pixel format "
242			"from 0x%08X to 0x%08X\n",
243			pixelformat, fmt.fmt.pix.pixelformat);
244		✗	res = AVERROR(EINVAL);
245			}
246
247		✗	if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
248		✗	av_log(ctx, AV_LOG_DEBUG,
249			"The V4L2 driver is using the interlaced mode\n");
250		✗	s->interlaced = 1;
251			}
252
253		✗	return res;
254			}
255
256		✗	static int first_field(const struct video_data *s)
257			{
258			int res;
259			v4l2_std_id std;
260
261		✗	res = v4l2_ioctl(s->fd, VIDIOC_G_STD, &std);
262		✗	if (res < 0)
263		✗	return 0;
264		✗	if (std & V4L2_STD_NTSC)
265		✗	return 0;
266
267		✗	return 1;
268			}
269
270			#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
271		✗	static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat)
272			{
273		✗	const struct video_data *s = ctx->priv_data;
274		✗	struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
275
276		✗	while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
277		✗	switch (vfse.type) {
278		✗	case V4L2_FRMSIZE_TYPE_DISCRETE:
279		✗	av_log(ctx, AV_LOG_INFO, " %ux%u",
280			vfse.discrete.width, vfse.discrete.height);
281		✗	break;
282		✗	case V4L2_FRMSIZE_TYPE_CONTINUOUS:
283			case V4L2_FRMSIZE_TYPE_STEPWISE:
284		✗	av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
285			vfse.stepwise.min_width,
286			vfse.stepwise.max_width,
287			vfse.stepwise.step_width,
288			vfse.stepwise.min_height,
289			vfse.stepwise.max_height,
290			vfse.stepwise.step_height);
291			}
292		✗	vfse.index++;
293			}
294		✗	}
295			#endif
296
297		✗	static void list_formats(AVFormatContext *ctx, int type)
298			{
299		✗	const struct video_data *s = ctx->priv_data;
300		✗	struct v4l2_fmtdesc vfd = { .type = s->buf_type };
301
302		✗	while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) {
303		✗	enum AVCodecID codec_id = ff_fmt_v4l2codec(vfd.pixelformat);
304		✗	enum AVPixelFormat pix_fmt = ff_fmt_v4l2ff(vfd.pixelformat, codec_id);
305
306		✗	vfd.index++;
307
308		✗	if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
309		✗	type & V4L_RAWFORMATS) {
310		✗	const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
311		✗	av_log(ctx, AV_LOG_INFO, "Raw : %11s : %20s :",
312			fmt_name ? fmt_name : "Unsupported",
313			vfd.description);
314		✗	} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
315		✗	type & V4L_COMPFORMATS) {
316		✗	const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
317		✗	av_log(ctx, AV_LOG_INFO, "Compressed: %11s : %20s :",
318			desc ? desc->name : "Unsupported",
319			vfd.description);
320			} else {
321		✗	continue;
322			}
323
324			#ifdef V4L2_FMT_FLAG_EMULATED
325		✗	if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
326		✗	av_log(ctx, AV_LOG_INFO, " Emulated :");
327			#endif
328			#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
329		✗	list_framesizes(ctx, vfd.pixelformat);
330			#endif
331		✗	av_log(ctx, AV_LOG_INFO, "\n");
332			}
333		✗	}
334
335		✗	static void list_standards(AVFormatContext *ctx)
336			{
337			int ret;
338		✗	struct video_data *s = ctx->priv_data;
339			struct v4l2_standard standard;
340
341		✗	if (s->std_id == 0)
342		✗	return;
343
344		✗	for (standard.index = 0; ; standard.index++) {
345		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
346		✗	ret = AVERROR(errno);
347		✗	if (ret == AVERROR(EINVAL)) {
348		✗	break;
349			} else {
350		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
351		✗	return;
352			}
353			}
354		✗	av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n",
355		✗	standard.index, (uint64_t)standard.id, standard.name);
356			}
357			}
358
359		✗	static int mmap_init(AVFormatContext *ctx)
360			{
361			int i, res;
362		✗	struct video_data *s = ctx->priv_data;
363		✗	struct v4l2_requestbuffers req = {
364		✗	.type = s->buf_type,
365			.count = desired_video_buffers,
366			.memory = V4L2_MEMORY_MMAP
367			};
368
369		✗	if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
370		✗	res = AVERROR(errno);
371		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
372		✗	return res;
373			}
374
375		✗	if (req.count < 2) {
376		✗	av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
377		✗	return AVERROR(ENOMEM);
378			}
379		✗	s->buffers = req.count;
380		✗	s->buf_start = av_malloc_array(s->buffers, sizeof(void *));
381		✗	if (!s->buf_start) {
382		✗	av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
383		✗	return AVERROR(ENOMEM);
384			}
385		✗	s->buf_len = av_malloc_array(s->buffers, sizeof(unsigned int));
386		✗	if (!s->buf_len) {
387		✗	av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
388		✗	av_freep(&s->buf_start);
389		✗	return AVERROR(ENOMEM);
390			}
391
392		✗	for (i = 0; i < req.count; i++) {
393			unsigned int buf_length, buf_offset;
394			struct v4l2_plane planes[VIDEO_MAX_PLANES];
395		✗	struct v4l2_buffer buf = {
396		✗	.type = s->buf_type,
397			.index = i,
398			.memory = V4L2_MEMORY_MMAP,
399		✗	.m.planes = s->multiplanar ? planes : NULL,
400		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
401			};
402		✗	if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
403		✗	res = AVERROR(errno);
404		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
405		✗	return res;
406			}
407
408		✗	if (s->multiplanar) {
409		✗	if (buf.length != 1) {
410		✗	av_log(ctx, AV_LOG_ERROR, "multiplanar only supported when buf.length == 1\n");
411		✗	return AVERROR_PATCHWELCOME;
412			}
413		✗	buf_length = buf.m.planes[0].length;
414		✗	buf_offset = buf.m.planes[0].m.mem_offset;
415			} else {
416		✗	buf_length = buf.length;
417		✗	buf_offset = buf.m.offset;
418			}
419
420		✗	s->buf_len[i] = buf_length;
421		✗	if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
422		✗	av_log(ctx, AV_LOG_ERROR,
423			"buf_len[%d] = %d < expected frame size %d\n",
424		✗	i, s->buf_len[i], s->frame_size);
425		✗	return AVERROR(ENOMEM);
426			}
427		✗	s->buf_start[i] = v4l2_mmap(NULL, buf_length,
428			PROT_READ | PROT_WRITE, MAP_SHARED,
429			s->fd, buf_offset);
430
431		✗	if (s->buf_start[i] == MAP_FAILED) {
432		✗	res = AVERROR(errno);
433		✗	av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
434		✗	return res;
435			}
436			}
437
438		✗	return 0;
439			}
440
441		✗	static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
442			{
443		✗	int res = 0;
444
445		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) {
446		✗	res = AVERROR(errno);
447		✗	av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
448			} else {
449		✗	atomic_fetch_add(&s->buffers_queued, 1);
450			}
451
452		✗	return res;
453			}
454
455		✗	static void mmap_release_buffer(void *opaque, uint8_t *data)
456			{
457			struct v4l2_plane planes[VIDEO_MAX_PLANES];
458		✗	struct v4l2_buffer buf = { 0 };
459		✗	struct buff_data *buf_descriptor = opaque;
460		✗	struct video_data *s = buf_descriptor->s;
461
462		✗	buf.type = s->buf_type;
463		✗	buf.memory = V4L2_MEMORY_MMAP;
464		✗	buf.index = buf_descriptor->index;
465		✗	buf.m.planes = s->multiplanar ? planes : NULL;
466		✗	buf.length = s->multiplanar ? VIDEO_MAX_PLANES : 0;
467		✗	av_free(buf_descriptor);
468
469		✗	enqueue_buffer(s, &buf);
470		✗	}
471
472			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
473		✗	static int64_t av_gettime_monotonic(void)
474			{
475		✗	return av_gettime_relative();
476			}
477			#endif
478
479		✗	static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
480			{
481		✗	struct video_data *s = ctx->priv_data;
482			int64_t now;
483
484		✗	now = av_gettime();
485		✗	if (s->ts_mode == V4L_TS_ABS &&
486		✗	ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
487		✗	av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
488		✗	s->ts_mode = V4L_TS_CONVERT_READY;
489		✗	return 0;
490			}
491			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
492		✗	if (ctx->streams[0]->avg_frame_rate.num) {
493		✗	now = av_gettime_monotonic();
494		✗	if (s->ts_mode == V4L_TS_MONO2ABS ||
495		✗	(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
496		✗	AVRational tb = {AV_TIME_BASE, 1};
497		✗	int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
498		✗	av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
499			/* microseconds instead of seconds, MHz instead of Hz */
500		✗	s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
501		✗	if (!s->timefilter)
502		✗	return AVERROR(ENOMEM);
503		✗	s->ts_mode = V4L_TS_CONVERT_READY;
504		✗	return 0;
505			}
506			}
507			#endif
508		✗	av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
509		✗	return AVERROR(EIO);
510			}
511
512		✗	static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
513			{
514		✗	struct video_data *s = ctx->priv_data;
515
516		✗	if (s->ts_mode) {
517		✗	int r = init_convert_timestamp(ctx, *ts);
518		✗	if (r < 0)
519		✗	return r;
520			}
521			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
522		✗	if (s->timefilter) {
523		✗	int64_t nowa = av_gettime();
524		✗	int64_t nowm = av_gettime_monotonic();
525		✗	ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
526		✗	s->last_time_m = nowm;
527		✗	*ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
528			}
529			#endif
530		✗	return 0;
531			}
532
533		✗	static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
534			{
535		✗	struct video_data *s = ctx->priv_data;
536			struct v4l2_plane planes[VIDEO_MAX_PLANES];
537		✗	struct v4l2_buffer buf = {
538		✗	.type = s->buf_type,
539			.memory = V4L2_MEMORY_MMAP,
540		✗	.m.planes = s->multiplanar ? planes : NULL,
541		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
542			};
543			struct timeval buf_ts;
544			unsigned int bytesused;
545			int res;
546
547		✗	pkt->size = 0;
548
549			/* FIXME: Some special treatment might be needed in case of loss of signal... */
550		✗	while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
551		✗	if (res < 0) {
552		✗	if (errno == EAGAIN)
553		✗	return AVERROR(EAGAIN);
554
555		✗	res = AVERROR(errno);
556		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
557		✗	av_err2str(res));
558		✗	return res;
559			}
560
561		✗	buf_ts = buf.timestamp;
562
563		✗	if (buf.index >= s->buffers) {
564		✗	av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
565		✗	return AVERROR(EINVAL);
566			}
567		✗	atomic_fetch_add(&s->buffers_queued, -1);
568			// always keep at least one buffer queued
569		✗	av_assert0(atomic_load(&s->buffers_queued) >= 1);
570
571		✗	bytesused = s->multiplanar ? buf.m.planes[0].bytesused : buf.bytesused;
572
573			#ifdef V4L2_BUF_FLAG_ERROR
574		✗	if (buf.flags & V4L2_BUF_FLAG_ERROR) {
575		✗	av_log(ctx, AV_LOG_WARNING,
576			"Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
577			bytesused);
578		✗	bytesused = 0;
579			} else
580			#endif
581			{
582			/* CPIA is a compressed format and we don't know the exact number of bytes
583			* used by a frame, so set it here as the driver announces it. */
584		✗	if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
585		✗	s->frame_size = bytesused;
586
587		✗	if (s->frame_size > 0 && bytesused != s->frame_size) {
588		✗	av_log(ctx, AV_LOG_WARNING,
589			"Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
590			bytesused, s->frame_size, buf.flags);
591		✗	bytesused = 0;
592			}
593			}
594
595			/* Image is at s->buff_start[buf.index] */
596		✗	if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
597			/* when we start getting low on queued buffers, fall back on copying data */
598		✗	res = av_new_packet(pkt, bytesused);
599		✗	if (res < 0) {
600		✗	av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
601		✗	enqueue_buffer(s, &buf);
602		✗	return res;
603			}
604		✗	memcpy(pkt->data, s->buf_start[buf.index], bytesused);
605
606		✗	res = enqueue_buffer(s, &buf);
607		✗	if (res) {
608		✗	av_packet_unref(pkt);
609		✗	return res;
610			}
611			} else {
612			struct buff_data *buf_descriptor;
613
614		✗	pkt->data = s->buf_start[buf.index];
615		✗	pkt->size = bytesused;
616
617		✗	buf_descriptor = av_malloc(sizeof(struct buff_data));
618		✗	if (!buf_descriptor) {
619			/* Something went wrong... Since av_malloc() failed, we cannot even
620			* allocate a buffer for memcpying into it
621			*/
622		✗	av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
623		✗	enqueue_buffer(s, &buf);
624
625		✗	return AVERROR(ENOMEM);
626			}
627		✗	buf_descriptor->index = buf.index;
628		✗	buf_descriptor->s = s;
629
630		✗	pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
631			buf_descriptor, 0);
632		✗	if (!pkt->buf) {
633		✗	av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
634		✗	enqueue_buffer(s, &buf);
635		✗	av_freep(&buf_descriptor);
636		✗	return AVERROR(ENOMEM);
637			}
638			}
639		✗	pkt->pts = buf_ts.tv_sec * INT64_C(1000000) + buf_ts.tv_usec;
640		✗	convert_timestamp(ctx, &pkt->pts);
641
642		✗	return pkt->size;
643			}
644
645		✗	static int mmap_start(AVFormatContext *ctx)
646			{
647		✗	struct video_data *s = ctx->priv_data;
648			enum v4l2_buf_type type;
649			int i, res;
650
651		✗	for (i = 0; i < s->buffers; i++) {
652			struct v4l2_plane planes[VIDEO_MAX_PLANES];
653		✗	struct v4l2_buffer buf = {
654		✗	.type = s->buf_type,
655			.index = i,
656			.memory = V4L2_MEMORY_MMAP,
657		✗	.m.planes = s->multiplanar ? planes : NULL,
658		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
659			};
660
661		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
662		✗	res = AVERROR(errno);
663		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
664		✗	av_err2str(res));
665		✗	return res;
666			}
667			}
668		✗	atomic_store(&s->buffers_queued, s->buffers);
669
670		✗	type = s->buf_type;
671		✗	if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
672		✗	res = AVERROR(errno);
673		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
674		✗	av_err2str(res));
675		✗	return res;
676			}
677
678		✗	return 0;
679			}
680
681		✗	static void mmap_close(struct video_data *s)
682			{
683			enum v4l2_buf_type type;
684			int i;
685
686		✗	type = s->buf_type;
687			/* We do not check for the result, because we could
688			* not do anything about it anyway...
689			*/
690		✗	v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
691		✗	for (i = 0; i < s->buffers; i++) {
692		✗	v4l2_munmap(s->buf_start[i], s->buf_len[i]);
693			}
694		✗	av_freep(&s->buf_start);
695		✗	av_freep(&s->buf_len);
696		✗	}
697
698		✗	static int v4l2_set_parameters(AVFormatContext *ctx)
699			{
700		✗	struct video_data *s = ctx->priv_data;
701		✗	struct v4l2_standard standard = { 0 };
702		✗	struct v4l2_streamparm streamparm = { 0 };
703			struct v4l2_fract *tpf;
704		✗	AVRational framerate_q = { 0 };
705			int i, ret;
706
707		✗	if (s->framerate &&
708		✗	(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
709		✗	av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
710			s->framerate);
711		✗	return ret;
712			}
713
714		✗	if (s->standard) {
715		✗	if (s->std_id) {
716		✗	ret = 0;
717		✗	av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
718			/* set tv standard */
719		✗	for (i = 0; ; i++) {
720		✗	standard.index = i;
721		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
722		✗	ret = AVERROR(errno);
723		✗	break;
724			}
725		✗	if (!av_strcasecmp(standard.name, s->standard))
726		✗	break;
727			}
728		✗	if (ret < 0) {
729		✗	av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
730		✗	return ret;
731			}
732
733		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
734		✗	ret = AVERROR(errno);
735		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
736		✗	return ret;
737			}
738			} else {
739		✗	av_log(ctx, AV_LOG_WARNING,
740			"This device does not support any standard\n");
741			}
742			}
743
744			/* get standard */
745		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
746		✗	tpf = &standard.frameperiod;
747		✗	for (i = 0; ; i++) {
748		✗	standard.index = i;
749		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
750		✗	ret = AVERROR(errno);
751		✗	if (ret == AVERROR(EINVAL)
752			#ifdef ENODATA
753		✗	|| ret == AVERROR(ENODATA)
754			#endif
755			) {
756		✗	tpf = &streamparm.parm.capture.timeperframe;
757		✗	break;
758			}
759		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
760		✗	return ret;
761			}
762		✗	if (standard.id == s->std_id) {
763		✗	av_log(ctx, AV_LOG_DEBUG,
764			"Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
765		✗	standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
766		✗	break;
767			}
768			}
769			} else {
770		✗	tpf = &streamparm.parm.capture.timeperframe;
771			}
772
773		✗	streamparm.type = s->buf_type;
774		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
775		✗	ret = AVERROR(errno);
776		✗	av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
777		✗	} else if (framerate_q.num && framerate_q.den) {
778		✗	if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
779		✗	tpf = &streamparm.parm.capture.timeperframe;
780
781		✗	av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
782			framerate_q.den, framerate_q.num);
783		✗	tpf->numerator = framerate_q.den;
784		✗	tpf->denominator = framerate_q.num;
785
786		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
787		✗	ret = AVERROR(errno);
788		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n",
789		✗	av_err2str(ret));
790		✗	return ret;
791			}
792
793		✗	if (framerate_q.num != tpf->denominator ||
794		✗	framerate_q.den != tpf->numerator) {
795		✗	av_log(ctx, AV_LOG_INFO,
796			"The driver changed the time per frame from "
797			"%d/%d to %d/%d\n",
798			framerate_q.den, framerate_q.num,
799			tpf->numerator, tpf->denominator);
800			}
801			} else {
802		✗	av_log(ctx, AV_LOG_WARNING,
803			"The driver does not permit changing the time per frame\n");
804			}
805			}
806		✗	if (tpf->denominator > 0 && tpf->numerator > 0) {
807		✗	ctx->streams[0]->avg_frame_rate.num = tpf->denominator;
808		✗	ctx->streams[0]->avg_frame_rate.den = tpf->numerator;
809		✗	ctx->streams[0]->r_frame_rate = ctx->streams[0]->avg_frame_rate;
810			} else
811		✗	av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n");
812
813		✗	return 0;
814			}
815
816		✗	static int device_try_init(AVFormatContext *ctx,
817			enum AVPixelFormat pix_fmt,
818			int *width,
819			int *height,
820			uint32_t *desired_format,
821			enum AVCodecID *codec_id)
822			{
823			int ret, i;
824
825		✗	*desired_format = ff_fmt_ff2v4l(pix_fmt, ctx->video_codec_id);
826
827		✗	if (*desired_format) {
828		✗	ret = device_init(ctx, width, height, *desired_format);
829		✗	if (ret < 0) {
830		✗	*desired_format = 0;
831		✗	if (ret != AVERROR(EINVAL))
832		✗	return ret;
833			}
834			}
835
836		✗	if (!*desired_format) {
837		✗	for (i = 0; ff_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) {
838		✗	if (ctx->video_codec_id == AV_CODEC_ID_NONE ||
839		✗	ff_fmt_conversion_table[i].codec_id == ctx->video_codec_id) {
840		✗	av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
841		✗	avcodec_get_name(ff_fmt_conversion_table[i].codec_id),
842		✗	(char *)av_x_if_null(av_get_pix_fmt_name(ff_fmt_conversion_table[i].ff_fmt), "none"));
843
844		✗	*desired_format = ff_fmt_conversion_table[i].v4l2_fmt;
845		✗	ret = device_init(ctx, width, height, *desired_format);
846		✗	if (ret >= 0)
847		✗	break;
848		✗	else if (ret != AVERROR(EINVAL))
849		✗	return ret;
850		✗	*desired_format = 0;
851			}
852			}
853
854		✗	if (*desired_format == 0) {
855		✗	av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for "
856			"codec '%s' (id %d), pixel format '%s' (id %d)\n",
857		✗	avcodec_get_name(ctx->video_codec_id), ctx->video_codec_id,
858		✗	(char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
859		✗	ret = AVERROR(EINVAL);
860			}
861			}
862
863		✗	*codec_id = ff_fmt_v4l2codec(*desired_format);
864		✗	if (*codec_id == AV_CODEC_ID_NONE)
865		✗	av_assert0(ret == AVERROR(EINVAL));
866		✗	return ret;
867			}
868
869		3682	static int v4l2_read_probe(const AVProbeData *p)
870			{
871	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 3682 times.	3682	if (av_strstart(p->filename, "/dev/video", NULL))
872		✗	return AVPROBE_SCORE_MAX - 1;
873		3682	return 0;
874			}
875
876		✗	static int v4l2_read_header(AVFormatContext *ctx)
877			{
878		✗	struct video_data *s = ctx->priv_data;
879			AVStream *st;
880		✗	int res = 0;
881			uint32_t desired_format;
882		✗	enum AVCodecID codec_id = AV_CODEC_ID_NONE;
883		✗	enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
884		✗	struct v4l2_input input = { 0 };
885
886		✗	st = avformat_new_stream(ctx, NULL);
887		✗	if (!st)
888		✗	return AVERROR(ENOMEM);
889
890			#if CONFIG_LIBV4L2
891			/* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
892			and errors will get sent to stderr */
893			if (s->use_libv4l2)
894			v4l2_log_file = fopen("/dev/null", "w");
895			#endif
896
897		✗	s->fd = device_open(ctx, ctx->url);
898		✗	if (s->fd < 0)
899		✗	return s->fd;
900
901		✗	if (s->channel != -1) {
902			/* set video input */
903		✗	av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
904		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
905		✗	res = AVERROR(errno);
906		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
907		✗	goto fail;
908			}
909			} else {
910			/* get current video input */
911		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
912		✗	res = AVERROR(errno);
913		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
914		✗	goto fail;
915			}
916			}
917
918			/* enum input */
919		✗	input.index = s->channel;
920		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
921		✗	res = AVERROR(errno);
922		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
923		✗	goto fail;
924			}
925		✗	s->std_id = input.std;
926		✗	av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
927		✗	s->channel, input.name, (uint64_t)input.std);
928
929		✗	if (s->list_format) {
930		✗	list_formats(ctx, s->list_format);
931		✗	res = AVERROR_EXIT;
932		✗	goto fail;
933			}
934
935		✗	if (s->list_standard) {
936		✗	list_standards(ctx);
937		✗	res = AVERROR_EXIT;
938		✗	goto fail;
939			}
940
941		✗	avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
942
943		✗	if (s->pixel_format) {
944		✗	const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(s->pixel_format);
945
946		✗	if (desc)
947		✗	ctx->video_codec_id = desc->id;
948
949		✗	pix_fmt = av_get_pix_fmt(s->pixel_format);
950
951		✗	if (pix_fmt == AV_PIX_FMT_NONE && !desc) {
952		✗	av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n",
953			s->pixel_format);
954
955		✗	res = AVERROR(EINVAL);
956		✗	goto fail;
957			}
958			}
959
960		✗	if (!s->width && !s->height) {
961		✗	struct v4l2_format fmt = { .type = s->buf_type };
962
963		✗	av_log(ctx, AV_LOG_VERBOSE,
964			"Querying the device for the current frame size\n");
965		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
966		✗	res = AVERROR(errno);
967		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
968		✗	av_err2str(res));
969		✗	goto fail;
970			}
971
972		✗	s->width = fmt.fmt.pix.width;
973		✗	s->height = fmt.fmt.pix.height;
974		✗	av_log(ctx, AV_LOG_VERBOSE,
975			"Setting frame size to %dx%d\n", s->width, s->height);
976			}
977
978		✗	res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
979		✗	if (res < 0)
980		✗	goto fail;
981
982			/* If no pixel_format was specified, the codec_id was not known up
983			* until now. Set video_codec_id in the context, as codec_id will
984			* not be available outside this function
985			*/
986		✗	if (codec_id != AV_CODEC_ID_NONE && ctx->video_codec_id == AV_CODEC_ID_NONE)
987		✗	ctx->video_codec_id = codec_id;
988
989		✗	if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0)
990		✗	goto fail;
991
992		✗	s->pixelformat = desired_format;
993
994		✗	if ((res = v4l2_set_parameters(ctx)) < 0)
995		✗	goto fail;
996
997		✗	st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
998		✗	if (st->codecpar->format != AV_PIX_FMT_NONE)
999		✗	s->frame_size = av_image_get_buffer_size(st->codecpar->format,
1000			s->width, s->height, 1);
1001
1002		✗	if ((res = mmap_init(ctx)) ||
1003		✗	(res = mmap_start(ctx)) < 0)
1004		✗	goto fail;
1005
1006		✗	s->top_field_first = first_field(s);
1007
1008		✗	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
1009		✗	st->codecpar->codec_id = codec_id;
1010		✗	if (codec_id == AV_CODEC_ID_RAWVIDEO)
1011		✗	st->codecpar->codec_tag =
1012		✗	avcodec_pix_fmt_to_codec_tag(st->codecpar->format);
1013		✗	else if (codec_id == AV_CODEC_ID_H264) {
1014		✗	avpriv_stream_set_need_parsing(st, AVSTREAM_PARSE_FULL_ONCE);
1015			}
1016		✗	if (desired_format == V4L2_PIX_FMT_YVU420)
1017		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', '1', '2');
1018		✗	else if (desired_format == V4L2_PIX_FMT_YVU410)
1019		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', 'U', '9');
1020		✗	st->codecpar->width = s->width;
1021		✗	st->codecpar->height = s->height;
1022		✗	if (st->avg_frame_rate.den)
1023		✗	st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
1024
1025		✗	return 0;
1026
1027		✗	fail:
1028		✗	v4l2_close(s->fd);
1029		✗	return res;
1030			}
1031
1032		✗	static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt)
1033			{
1034			int res;
1035
1036		✗	if ((res = mmap_read_frame(ctx, pkt)) < 0) {
1037		✗	return res;
1038			}
1039
1040		✗	return pkt->size;
1041			}
1042
1043		✗	static int v4l2_read_close(AVFormatContext *ctx)
1044			{
1045		✗	struct video_data *s = ctx->priv_data;
1046
1047		✗	if (atomic_load(&s->buffers_queued) != s->buffers)
1048		✗	av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
1049			"close.\n");
1050
1051		✗	mmap_close(s);
1052
1053		✗	ff_timefilter_destroy(s->timefilter);
1054		✗	v4l2_close(s->fd);
1055		✗	return 0;
1056			}
1057
1058		✗	static int v4l2_is_v4l_dev(const char *name)
1059			{
1060		✗	return !strncmp(name, "video", 5) ||
1061		✗	!strncmp(name, "radio", 5) ||
1062		✗	!strncmp(name, "vbi", 3) ||
1063		✗	!strncmp(name, "v4l-subdev", 10);
1064			}
1065
1066		✗	static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_list)
1067			{
1068		✗	struct video_data *s = ctx->priv_data;
1069			DIR *dir;
1070			struct dirent *entry;
1071		✗	int ret = 0;
1072
1073		✗	if (!device_list)
1074		✗	return AVERROR(EINVAL);
1075
1076		✗	dir = opendir("/dev");
1077		✗	if (!dir) {
1078		✗	ret = AVERROR(errno);
1079		✗	av_log(ctx, AV_LOG_ERROR, "Couldn't open the directory: %s\n", av_err2str(ret));
1080		✗	return ret;
1081			}
1082		✗	while ((entry = readdir(dir))) {
1083		✗	AVDeviceInfo *device = NULL;
1084			struct v4l2_capability cap;
1085		✗	int fd = -1, size;
1086			char device_name[256];
1087
1088		✗	if (!v4l2_is_v4l_dev(entry->d_name))
1089		✗	continue;
1090
1091		✗	size = snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
1092		✗	if (size >= sizeof(device_name)) {
1093		✗	av_log(ctx, AV_LOG_ERROR, "Device name too long.\n");
1094		✗	ret = AVERROR(ENOSYS);
1095		✗	break;
1096			}
1097
1098		✗	if ((fd = device_open(ctx, device_name)) < 0)
1099		✗	continue;
1100
1101		✗	if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
1102		✗	ret = AVERROR(errno);
1103		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", av_err2str(ret));
1104		✗	goto fail;
1105			}
1106
1107		✗	device = av_mallocz(sizeof(AVDeviceInfo));
1108		✗	if (!device) {
1109		✗	ret = AVERROR(ENOMEM);
1110		✗	goto fail;
1111			}
1112		✗	device->device_name = av_strdup(device_name);
1113		✗	device->device_description = av_strdup(cap.card);
1114		✗	if (!device->device_name || !device->device_description) {
1115		✗	ret = AVERROR(ENOMEM);
1116		✗	goto fail;
1117			}
1118
1119		✗	if ((ret = av_dynarray_add_nofree(&device_list->devices,
1120			&device_list->nb_devices, device)) < 0)
1121		✗	goto fail;
1122
1123		✗	v4l2_close(fd);
1124		✗	continue;
1125
1126		✗	fail:
1127		✗	if (device) {
1128		✗	av_freep(&device->device_name);
1129		✗	av_freep(&device->device_description);
1130		✗	av_freep(&device);
1131			}
1132		✗	v4l2_close(fd);
1133		✗	break;
1134			}
1135		✗	closedir(dir);
1136		✗	return ret;
1137			}
1138
1139			#define OFFSET(x) offsetof(struct video_data, x)
1140			#define DEC AV_OPT_FLAG_DECODING_PARAM
1141
1142			static const AVOption options[] = {
1143			{ "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
1144			{ "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
1145			{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
1146			{ "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1147			{ "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1148			{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1149
1150			{ "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, .unit = "list_formats" },
1151			{ "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1152			{ "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1153			{ "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1154
1155			{ "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, .unit = "list_standards" },
1156			{ "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, .unit = "list_standards" },
1157
1158			{ "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1159			{ "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1160			{ "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, .unit = "timestamps" },
1161			{ "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, .unit = "timestamps" },
1162			{ "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, .unit = "timestamps" },
1163			{ "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1164			{ NULL },
1165			};
1166
1167			static const AVClass v4l2_class = {
1168			.class_name = "V4L2 indev",
1169			.item_name = av_default_item_name,
1170			.option = options,
1171			.version = LIBAVUTIL_VERSION_INT,
1172			.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
1173			};
1174
1175			const FFInputFormat ff_v4l2_demuxer = {
1176			.p.name = "video4linux2,v4l2",
1177			.p.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
1178			.p.flags = AVFMT_NOFILE,
1179			.p.priv_class = &v4l2_class,
1180			.priv_data_size = sizeof(struct video_data),
1181			.read_probe = v4l2_read_probe,
1182			.read_header = v4l2_read_header,
1183			.read_packet = v4l2_read_packet,
1184			.read_close = v4l2_read_close,
1185			.get_device_list = v4l2_get_device_list,
1186			};
1187