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 buf_data {
84			void *start;
85			unsigned int len;
86			};
87
88			struct video_data {
89			AVClass *class;
90			int fd;
91			int pixelformat; /* V4L2_PIX_FMT_* */
92			int width, height;
93			int frame_size;
94			int interlaced;
95			int top_field_first;
96			int ts_mode;
97			TimeFilter *timefilter;
98			int64_t last_time_m;
99
100			int multiplanar;
101			enum v4l2_buf_type buf_type;
102
103			int buffers;
104			atomic_int buffers_queued;
105			struct buf_data *buf_data;
106			char *standard;
107			v4l2_std_id std_id;
108			int channel;
109			char *pixel_format; /**< Set by a private option. */
110			int list_format; /**< Set by a private option. */
111			int list_standard; /**< Set by a private option. */
112			char *framerate; /**< Set by a private option. */
113
114			int use_libv4l2;
115			int (*open_f)(const char *file, int oflag, ...);
116			int (*close_f)(int fd);
117			int (*dup_f)(int fd);
118			#if HAVE_IOCTL_POSIX
119			int (*ioctl_f)(int fd, int request, ...);
120			#else
121			int (*ioctl_f)(int fd, unsigned long int request, ...);
122			#endif
123			ssize_t (*read_f)(int fd, void *buffer, size_t n);
124			void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset);
125			int (*munmap_f)(void *_start, size_t length);
126			};
127
128			struct buf_desc {
129			struct video_data *s;
130			int index;
131			};
132
133		✗	static int device_open(AVFormatContext *ctx, const char* device_path)
134			{
135		✗	struct video_data *s = ctx->priv_data;
136			struct v4l2_capability cap;
137			int fd;
138			int err;
139		✗	int flags = O_RDWR;
140
141			#define SET_WRAPPERS(prefix) do { \
142			s->open_f = prefix ## open; \
143			s->close_f = prefix ## close; \
144			s->dup_f = prefix ## dup; \
145			s->ioctl_f = prefix ## ioctl; \
146			s->read_f = prefix ## read; \
147			s->mmap_f = prefix ## mmap; \
148			s->munmap_f = prefix ## munmap; \
149			} while (0)
150
151		✗	if (s->use_libv4l2) {
152			#if CONFIG_LIBV4L2
153			SET_WRAPPERS(v4l2_);
154			#else
155		✗	av_log(ctx, AV_LOG_ERROR, "libavdevice is not built with libv4l2 support.\n");
156		✗	return AVERROR(EINVAL);
157			#endif
158			} else {
159		✗	SET_WRAPPERS();
160			}
161
162			#define v4l2_open s->open_f
163			#define v4l2_close s->close_f
164			#define v4l2_dup s->dup_f
165			#define v4l2_ioctl s->ioctl_f
166			#define v4l2_read s->read_f
167			#define v4l2_mmap s->mmap_f
168			#define v4l2_munmap s->munmap_f
169
170		✗	if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
171		✗	flags |= O_NONBLOCK;
172			}
173
174		✗	fd = v4l2_open(device_path, flags, 0);
175		✗	if (fd < 0) {
176		✗	err = AVERROR(errno);
177		✗	av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
178		✗	device_path, av_err2str(err));
179		✗	return err;
180			}
181
182		✗	if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
183		✗	err = AVERROR(errno);
184		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
185		✗	av_err2str(err));
186		✗	goto fail;
187			}
188
189		✗	av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
190			fd, cap.capabilities);
191
192		✗	if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
193		✗	s->multiplanar = 0;
194		✗	s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
195		✗	} else if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) {
196		✗	s->multiplanar = 1;
197		✗	s->buf_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
198			} else {
199		✗	av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
200		✗	err = AVERROR(ENODEV);
201		✗	goto fail;
202			}
203
204		✗	if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
205		✗	av_log(ctx, AV_LOG_ERROR,
206			"The device does not support the streaming I/O method.\n");
207		✗	err = AVERROR(ENOSYS);
208		✗	goto fail;
209			}
210
211		✗	return fd;
212
213		✗	fail:
214		✗	v4l2_close(fd);
215		✗	return err;
216			}
217
218		✗	static int device_init(AVFormatContext *ctx, int *width, int *height,
219			uint32_t pixelformat)
220			{
221		✗	struct video_data *s = ctx->priv_data;
222		✗	struct v4l2_format fmt = { .type = s->buf_type };
223		✗	int res = 0;
224
225		✗	fmt.fmt.pix.width = *width;
226		✗	fmt.fmt.pix.height = *height;
227		✗	fmt.fmt.pix.pixelformat = pixelformat;
228		✗	fmt.fmt.pix.field = V4L2_FIELD_ANY;
229
230			/* Some drivers will fail and return EINVAL when the pixelformat
231			is not supported (even if type field is valid and supported) */
232		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0)
233		✗	res = AVERROR(errno);
234
235		✗	if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
236		✗	av_log(ctx, AV_LOG_INFO,
237			"The V4L2 driver changed the video from %dx%d to %dx%d\n",
238			*width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
239		✗	*width = fmt.fmt.pix.width;
240		✗	*height = fmt.fmt.pix.height;
241			}
242
243		✗	if (pixelformat != fmt.fmt.pix.pixelformat) {
244		✗	av_log(ctx, AV_LOG_DEBUG,
245			"The V4L2 driver changed the pixel format "
246			"from 0x%08X to 0x%08X\n",
247			pixelformat, fmt.fmt.pix.pixelformat);
248		✗	res = AVERROR(EINVAL);
249			}
250
251		✗	if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
252		✗	av_log(ctx, AV_LOG_DEBUG,
253			"The V4L2 driver is using the interlaced mode\n");
254		✗	s->interlaced = 1;
255			}
256
257		✗	return res;
258			}
259
260		✗	static int first_field(const struct video_data *s)
261			{
262			int res;
263			v4l2_std_id std;
264
265		✗	res = v4l2_ioctl(s->fd, VIDIOC_G_STD, &std);
266		✗	if (res < 0)
267		✗	return 0;
268		✗	if (std & V4L2_STD_NTSC)
269		✗	return 0;
270
271		✗	return 1;
272			}
273
274			#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
275		✗	static void list_framesizes(AVFormatContext *ctx, uint32_t pixelformat)
276			{
277		✗	const struct video_data *s = ctx->priv_data;
278		✗	struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
279
280		✗	while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
281		✗	switch (vfse.type) {
282		✗	case V4L2_FRMSIZE_TYPE_DISCRETE:
283		✗	av_log(ctx, AV_LOG_INFO, " %ux%u",
284			vfse.discrete.width, vfse.discrete.height);
285		✗	break;
286		✗	case V4L2_FRMSIZE_TYPE_CONTINUOUS:
287			case V4L2_FRMSIZE_TYPE_STEPWISE:
288		✗	av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
289			vfse.stepwise.min_width,
290			vfse.stepwise.max_width,
291			vfse.stepwise.step_width,
292			vfse.stepwise.min_height,
293			vfse.stepwise.max_height,
294			vfse.stepwise.step_height);
295			}
296		✗	vfse.index++;
297			}
298		✗	}
299			#endif
300
301		✗	static void list_formats(AVFormatContext *ctx, int type)
302			{
303		✗	const struct video_data *s = ctx->priv_data;
304		✗	struct v4l2_fmtdesc vfd = { .type = s->buf_type };
305
306		✗	while(!v4l2_ioctl(s->fd, VIDIOC_ENUM_FMT, &vfd)) {
307		✗	enum AVCodecID codec_id = ff_fmt_v4l2codec(vfd.pixelformat);
308		✗	enum AVPixelFormat pix_fmt = ff_fmt_v4l2ff(vfd.pixelformat, codec_id);
309
310		✗	vfd.index++;
311
312		✗	if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
313		✗	type & V4L_RAWFORMATS) {
314		✗	const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
315		✗	av_log(ctx, AV_LOG_INFO, "Raw : %11s : %20s :",
316			fmt_name ? fmt_name : "Unsupported",
317			vfd.description);
318		✗	} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
319		✗	type & V4L_COMPFORMATS) {
320		✗	const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
321		✗	av_log(ctx, AV_LOG_INFO, "Compressed: %11s : %20s :",
322			desc ? desc->name : "Unsupported",
323			vfd.description);
324			} else {
325		✗	continue;
326			}
327
328			#ifdef V4L2_FMT_FLAG_EMULATED
329		✗	if (vfd.flags & V4L2_FMT_FLAG_EMULATED)
330		✗	av_log(ctx, AV_LOG_INFO, " Emulated :");
331			#endif
332			#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
333		✗	list_framesizes(ctx, vfd.pixelformat);
334			#endif
335		✗	av_log(ctx, AV_LOG_INFO, "\n");
336			}
337		✗	}
338
339		✗	static void list_standards(AVFormatContext *ctx)
340			{
341			int ret;
342		✗	struct video_data *s = ctx->priv_data;
343			struct v4l2_standard standard;
344
345		✗	if (s->std_id == 0)
346		✗	return;
347
348		✗	for (standard.index = 0; ; standard.index++) {
349		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
350		✗	ret = AVERROR(errno);
351		✗	if (ret == AVERROR(EINVAL)) {
352		✗	break;
353			} else {
354		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
355		✗	return;
356			}
357			}
358		✗	av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n",
359		✗	standard.index, (uint64_t)standard.id, standard.name);
360			}
361			}
362
363		✗	static void mmap_free(struct video_data *s, int n)
364			{
365		✗	for (int i = 0; i < n; i++)
366		✗	v4l2_munmap(s->buf_data[i].start, s->buf_data[i].len);
367		✗	av_freep(&s->buf_data);
368		✗	}
369
370		✗	static int mmap_init(AVFormatContext *ctx)
371			{
372			int i, res;
373		✗	struct video_data *s = ctx->priv_data;
374		✗	struct v4l2_requestbuffers req = {
375		✗	.type = s->buf_type,
376			.count = desired_video_buffers,
377			.memory = V4L2_MEMORY_MMAP
378			};
379
380		✗	if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
381		✗	res = AVERROR(errno);
382		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
383		✗	return res;
384			}
385
386		✗	if (req.count < 2) {
387		✗	av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
388		✗	return AVERROR(ENOMEM);
389			}
390		✗	s->buffers = req.count;
391		✗	s->buf_data = av_malloc_array(s->buffers, sizeof(struct buf_data));
392		✗	if (!s->buf_data) {
393		✗	av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer data\n");
394		✗	return AVERROR(ENOMEM);
395			}
396
397		✗	for (i = 0; i < req.count; i++) {
398			unsigned int buf_length, buf_offset;
399			struct v4l2_plane planes[VIDEO_MAX_PLANES];
400		✗	struct v4l2_buffer buf = {
401		✗	.type = s->buf_type,
402			.index = i,
403			.memory = V4L2_MEMORY_MMAP,
404		✗	.m.planes = s->multiplanar ? planes : NULL,
405		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
406			};
407		✗	if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
408		✗	res = AVERROR(errno);
409		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
410		✗	goto fail;
411			}
412
413		✗	if (s->multiplanar) {
414		✗	if (buf.length != 1) {
415		✗	av_log(ctx, AV_LOG_ERROR, "multiplanar only supported when buf.length == 1\n");
416		✗	res = AVERROR_PATCHWELCOME;
417		✗	goto fail;
418			}
419		✗	buf_length = buf.m.planes[0].length;
420		✗	buf_offset = buf.m.planes[0].m.mem_offset;
421			} else {
422		✗	buf_length = buf.length;
423		✗	buf_offset = buf.m.offset;
424			}
425
426		✗	s->buf_data[i].len = buf_length;
427		✗	if (s->frame_size > 0 && s->buf_data[i].len < s->frame_size) {
428		✗	av_log(ctx, AV_LOG_ERROR,
429			"buf_data[%d].len = %d < expected frame size %d\n",
430			i, buf_length, s->frame_size);
431		✗	res = AVERROR(ENOMEM);
432		✗	goto fail;
433			}
434		✗	s->buf_data[i].start = v4l2_mmap(NULL, buf_length,
435			PROT_READ | PROT_WRITE, MAP_SHARED,
436			s->fd, buf_offset);
437
438		✗	if (s->buf_data[i].start == MAP_FAILED) {
439		✗	res = AVERROR(errno);
440		✗	av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
441		✗	goto fail;
442			}
443			}
444
445		✗	return 0;
446
447		✗	fail:
448		✗	mmap_free(s, i);
449		✗	return res;
450			}
451
452		✗	static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
453			{
454		✗	int res = 0;
455
456		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) {
457		✗	res = AVERROR(errno);
458		✗	av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
459			} else {
460		✗	atomic_fetch_add(&s->buffers_queued, 1);
461			}
462
463		✗	return res;
464			}
465
466		✗	static void mmap_release_buffer(void *opaque, uint8_t *data)
467			{
468			struct v4l2_plane planes[VIDEO_MAX_PLANES];
469		✗	struct v4l2_buffer buf = { 0 };
470		✗	struct buf_desc *buf_descriptor = opaque;
471		✗	struct video_data *s = buf_descriptor->s;
472
473		✗	buf.type = s->buf_type;
474		✗	buf.memory = V4L2_MEMORY_MMAP;
475		✗	buf.index = buf_descriptor->index;
476		✗	buf.m.planes = s->multiplanar ? planes : NULL;
477		✗	buf.length = s->multiplanar ? VIDEO_MAX_PLANES : 0;
478		✗	av_free(buf_descriptor);
479
480		✗	enqueue_buffer(s, &buf);
481		✗	}
482
483			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
484		✗	static int64_t av_gettime_monotonic(void)
485			{
486		✗	return av_gettime_relative();
487			}
488			#endif
489
490		✗	static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
491			{
492		✗	struct video_data *s = ctx->priv_data;
493			int64_t now;
494
495		✗	now = av_gettime();
496		✗	if (s->ts_mode == V4L_TS_ABS &&
497		✗	ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
498		✗	av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
499		✗	s->ts_mode = V4L_TS_CONVERT_READY;
500		✗	return 0;
501			}
502			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
503		✗	if (ctx->streams[0]->avg_frame_rate.num) {
504		✗	now = av_gettime_monotonic();
505		✗	if (s->ts_mode == V4L_TS_MONO2ABS ||
506		✗	(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
507		✗	AVRational tb = {AV_TIME_BASE, 1};
508		✗	int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
509		✗	av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
510			/* microseconds instead of seconds, MHz instead of Hz */
511		✗	s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
512		✗	if (!s->timefilter)
513		✗	return AVERROR(ENOMEM);
514		✗	s->ts_mode = V4L_TS_CONVERT_READY;
515		✗	return 0;
516			}
517			}
518			#endif
519		✗	av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
520		✗	return AVERROR(EIO);
521			}
522
523		✗	static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
524			{
525		✗	struct video_data *s = ctx->priv_data;
526
527		✗	if (s->ts_mode) {
528		✗	int r = init_convert_timestamp(ctx, *ts);
529		✗	if (r < 0)
530		✗	return r;
531			}
532			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
533		✗	if (s->timefilter) {
534		✗	int64_t nowa = av_gettime();
535		✗	int64_t nowm = av_gettime_monotonic();
536		✗	ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
537		✗	s->last_time_m = nowm;
538		✗	*ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
539			}
540			#endif
541		✗	return 0;
542			}
543
544		✗	static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
545			{
546		✗	struct video_data *s = ctx->priv_data;
547			struct v4l2_plane planes[VIDEO_MAX_PLANES];
548		✗	struct v4l2_buffer buf = {
549		✗	.type = s->buf_type,
550			.memory = V4L2_MEMORY_MMAP,
551		✗	.m.planes = s->multiplanar ? planes : NULL,
552		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
553			};
554			struct timeval buf_ts;
555			unsigned int bytesused;
556			int res;
557
558		✗	pkt->size = 0;
559
560			/* FIXME: Some special treatment might be needed in case of loss of signal... */
561		✗	while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
562		✗	if (res < 0) {
563		✗	if (errno == EAGAIN)
564		✗	return AVERROR(EAGAIN);
565
566		✗	res = AVERROR(errno);
567		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
568		✗	av_err2str(res));
569		✗	return res;
570			}
571
572		✗	buf_ts = buf.timestamp;
573
574		✗	if (buf.index >= s->buffers) {
575		✗	av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
576		✗	return AVERROR(EINVAL);
577			}
578		✗	atomic_fetch_add(&s->buffers_queued, -1);
579			// always keep at least one buffer queued
580		✗	av_assert0(atomic_load(&s->buffers_queued) >= 1);
581
582		✗	bytesused = s->multiplanar ? buf.m.planes[0].bytesused : buf.bytesused;
583
584			#ifdef V4L2_BUF_FLAG_ERROR
585		✗	if (buf.flags & V4L2_BUF_FLAG_ERROR) {
586		✗	av_log(ctx, AV_LOG_WARNING,
587			"Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
588			bytesused);
589		✗	bytesused = 0;
590			} else
591			#endif
592			{
593			/* CPIA is a compressed format and we don't know the exact number of bytes
594			* used by a frame, so set it here as the driver announces it. */
595		✗	if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
596		✗	s->frame_size = bytesused;
597
598		✗	if (s->frame_size > 0 && bytesused != s->frame_size) {
599		✗	av_log(ctx, AV_LOG_WARNING,
600			"Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
601			bytesused, s->frame_size, buf.flags);
602		✗	bytesused = 0;
603			}
604			}
605
606			/* Image is at s->buf_data[buf.index].start */
607		✗	if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
608			/* when we start getting low on queued buffers, fall back on copying data */
609		✗	res = av_new_packet(pkt, bytesused);
610		✗	if (res < 0) {
611		✗	av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
612		✗	enqueue_buffer(s, &buf);
613		✗	return res;
614			}
615		✗	memcpy(pkt->data, s->buf_data[buf.index].start, bytesused);
616
617		✗	res = enqueue_buffer(s, &buf);
618		✗	if (res) {
619		✗	av_packet_unref(pkt);
620		✗	return res;
621			}
622			} else {
623			struct buf_desc *buf_descriptor;
624
625		✗	pkt->data = s->buf_data[buf.index].start;
626		✗	pkt->size = bytesused;
627
628		✗	buf_descriptor = av_malloc(sizeof(struct buf_desc));
629		✗	if (!buf_descriptor) {
630			/* Something went wrong... Since av_malloc() failed, we cannot even
631			* allocate a buffer for memcpying into it
632			*/
633		✗	av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
634		✗	enqueue_buffer(s, &buf);
635
636		✗	return AVERROR(ENOMEM);
637			}
638		✗	buf_descriptor->index = buf.index;
639		✗	buf_descriptor->s = s;
640
641		✗	pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
642			buf_descriptor, 0);
643		✗	if (!pkt->buf) {
644		✗	av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
645		✗	enqueue_buffer(s, &buf);
646		✗	av_freep(&buf_descriptor);
647		✗	return AVERROR(ENOMEM);
648			}
649			}
650		✗	pkt->pts = buf_ts.tv_sec * INT64_C(1000000) + buf_ts.tv_usec;
651		✗	convert_timestamp(ctx, &pkt->pts);
652
653		✗	return pkt->size;
654			}
655
656		✗	static int mmap_start(AVFormatContext *ctx)
657			{
658		✗	struct video_data *s = ctx->priv_data;
659			enum v4l2_buf_type type;
660			int i, res;
661
662		✗	for (i = 0; i < s->buffers; i++) {
663			struct v4l2_plane planes[VIDEO_MAX_PLANES];
664		✗	struct v4l2_buffer buf = {
665		✗	.type = s->buf_type,
666			.index = i,
667			.memory = V4L2_MEMORY_MMAP,
668		✗	.m.planes = s->multiplanar ? planes : NULL,
669		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
670			};
671
672		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
673		✗	res = AVERROR(errno);
674		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
675		✗	av_err2str(res));
676		✗	return res;
677			}
678			}
679		✗	atomic_store(&s->buffers_queued, s->buffers);
680
681		✗	type = s->buf_type;
682		✗	if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
683		✗	res = AVERROR(errno);
684		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
685		✗	av_err2str(res));
686		✗	return res;
687			}
688
689		✗	return 0;
690			}
691
692		✗	static void mmap_close(struct video_data *s)
693			{
694			enum v4l2_buf_type type;
695
696		✗	type = s->buf_type;
697			/* We do not check for the result, because we could
698			* not do anything about it anyway...
699			*/
700		✗	v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
701		✗	mmap_free(s, s->buffers);
702		✗	}
703
704		✗	static int v4l2_set_parameters(AVFormatContext *ctx)
705			{
706		✗	struct video_data *s = ctx->priv_data;
707		✗	struct v4l2_standard standard = { 0 };
708		✗	struct v4l2_streamparm streamparm = { 0 };
709			struct v4l2_fract *tpf;
710		✗	AVRational framerate_q = { 0 };
711			int i, ret;
712
713		✗	if (s->framerate &&
714		✗	(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
715		✗	av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
716			s->framerate);
717		✗	return ret;
718			}
719
720		✗	if (s->standard) {
721		✗	if (s->std_id) {
722		✗	ret = 0;
723		✗	av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
724			/* set tv standard */
725		✗	for (i = 0; ; i++) {
726		✗	standard.index = i;
727		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
728		✗	ret = AVERROR(errno);
729		✗	break;
730			}
731		✗	if (!av_strcasecmp(standard.name, s->standard))
732		✗	break;
733			}
734		✗	if (ret < 0) {
735		✗	av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
736		✗	return ret;
737			}
738
739		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
740		✗	ret = AVERROR(errno);
741		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
742		✗	return ret;
743			}
744			} else {
745		✗	av_log(ctx, AV_LOG_WARNING,
746			"This device does not support any standard\n");
747			}
748			}
749
750			/* get standard */
751		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
752		✗	tpf = &standard.frameperiod;
753		✗	for (i = 0; ; i++) {
754		✗	standard.index = i;
755		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
756		✗	ret = AVERROR(errno);
757		✗	if (ret == AVERROR(EINVAL)
758			#ifdef ENODATA
759		✗	|| ret == AVERROR(ENODATA)
760			#endif
761			) {
762		✗	tpf = &streamparm.parm.capture.timeperframe;
763		✗	break;
764			}
765		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
766		✗	return ret;
767			}
768		✗	if (standard.id == s->std_id) {
769		✗	av_log(ctx, AV_LOG_DEBUG,
770			"Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
771		✗	standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
772		✗	break;
773			}
774			}
775			} else {
776		✗	tpf = &streamparm.parm.capture.timeperframe;
777			}
778
779		✗	streamparm.type = s->buf_type;
780		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
781		✗	ret = AVERROR(errno);
782		✗	av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
783		✗	} else if (framerate_q.num && framerate_q.den) {
784		✗	if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
785		✗	tpf = &streamparm.parm.capture.timeperframe;
786
787		✗	av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
788			framerate_q.den, framerate_q.num);
789		✗	tpf->numerator = framerate_q.den;
790		✗	tpf->denominator = framerate_q.num;
791
792		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
793		✗	ret = AVERROR(errno);
794		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n",
795		✗	av_err2str(ret));
796		✗	return ret;
797			}
798
799		✗	if (framerate_q.num != tpf->denominator ||
800		✗	framerate_q.den != tpf->numerator) {
801		✗	av_log(ctx, AV_LOG_INFO,
802			"The driver changed the time per frame from "
803			"%d/%d to %d/%d\n",
804			framerate_q.den, framerate_q.num,
805			tpf->numerator, tpf->denominator);
806			}
807			} else {
808		✗	av_log(ctx, AV_LOG_WARNING,
809			"The driver does not permit changing the time per frame\n");
810			}
811			}
812		✗	if (tpf->denominator > 0 && tpf->numerator > 0) {
813		✗	ctx->streams[0]->avg_frame_rate.num = tpf->denominator;
814		✗	ctx->streams[0]->avg_frame_rate.den = tpf->numerator;
815		✗	ctx->streams[0]->r_frame_rate = ctx->streams[0]->avg_frame_rate;
816			} else
817		✗	av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n");
818
819		✗	return 0;
820			}
821
822		✗	static int device_try_init(AVFormatContext *ctx,
823			enum AVPixelFormat pix_fmt,
824			int *width,
825			int *height,
826			uint32_t *desired_format,
827			enum AVCodecID *codec_id)
828			{
829			int ret, i;
830
831		✗	*desired_format = ff_fmt_ff2v4l(pix_fmt, ctx->video_codec_id);
832
833		✗	if (*desired_format) {
834		✗	ret = device_init(ctx, width, height, *desired_format);
835		✗	if (ret < 0) {
836		✗	*desired_format = 0;
837		✗	if (ret != AVERROR(EINVAL))
838		✗	return ret;
839			}
840			}
841
842		✗	if (!*desired_format) {
843		✗	for (i = 0; ff_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) {
844		✗	if (ctx->video_codec_id == AV_CODEC_ID_NONE ||
845		✗	ff_fmt_conversion_table[i].codec_id == ctx->video_codec_id) {
846		✗	av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
847		✗	avcodec_get_name(ff_fmt_conversion_table[i].codec_id),
848		✗	(char *)av_x_if_null(av_get_pix_fmt_name(ff_fmt_conversion_table[i].ff_fmt), "none"));
849
850		✗	*desired_format = ff_fmt_conversion_table[i].v4l2_fmt;
851		✗	ret = device_init(ctx, width, height, *desired_format);
852		✗	if (ret >= 0)
853		✗	break;
854		✗	else if (ret != AVERROR(EINVAL))
855		✗	return ret;
856		✗	*desired_format = 0;
857			}
858			}
859
860		✗	if (*desired_format == 0) {
861		✗	av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for "
862			"codec '%s' (id %d), pixel format '%s' (id %d)\n",
863		✗	avcodec_get_name(ctx->video_codec_id), ctx->video_codec_id,
864		✗	(char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
865		✗	ret = AVERROR(EINVAL);
866			}
867			}
868
869		✗	*codec_id = ff_fmt_v4l2codec(*desired_format);
870		✗	if (*codec_id == AV_CODEC_ID_NONE)
871		✗	av_assert0(ret == AVERROR(EINVAL));
872		✗	return ret;
873			}
874
875		4150	static int v4l2_read_probe(const AVProbeData *p)
876			{
877	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 4150 times.	4150	if (av_strstart(p->filename, "/dev/video", NULL))
878		✗	return AVPROBE_SCORE_MAX - 1;
879		4150	return 0;
880			}
881
882		✗	static int v4l2_read_header(AVFormatContext *ctx)
883			{
884		✗	struct video_data *s = ctx->priv_data;
885			AVStream *st;
886		✗	int res = 0;
887			uint32_t desired_format;
888		✗	enum AVCodecID codec_id = AV_CODEC_ID_NONE;
889		✗	enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
890		✗	struct v4l2_input input = { 0 };
891
892		✗	st = avformat_new_stream(ctx, NULL);
893		✗	if (!st)
894		✗	return AVERROR(ENOMEM);
895
896			#if CONFIG_LIBV4L2
897			/* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
898			and errors will get sent to stderr */
899			if (s->use_libv4l2)
900			v4l2_log_file = fopen("/dev/null", "w");
901			#endif
902
903		✗	s->fd = device_open(ctx, ctx->url);
904		✗	if (s->fd < 0)
905		✗	return s->fd;
906
907		✗	if (s->channel != -1) {
908			/* set video input */
909		✗	av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
910		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
911		✗	res = AVERROR(errno);
912		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
913		✗	goto fail;
914			}
915			} else {
916			/* get current video input */
917		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
918		✗	res = AVERROR(errno);
919		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
920		✗	goto fail;
921			}
922			}
923
924			/* enum input */
925		✗	input.index = s->channel;
926		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
927		✗	res = AVERROR(errno);
928		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
929		✗	goto fail;
930			}
931		✗	s->std_id = input.std;
932		✗	av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
933		✗	s->channel, input.name, (uint64_t)input.std);
934
935		✗	if (s->list_format) {
936		✗	list_formats(ctx, s->list_format);
937		✗	res = AVERROR_EXIT;
938		✗	goto fail;
939			}
940
941		✗	if (s->list_standard) {
942		✗	list_standards(ctx);
943		✗	res = AVERROR_EXIT;
944		✗	goto fail;
945			}
946
947		✗	avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
948
949		✗	if (s->pixel_format) {
950		✗	const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(s->pixel_format);
951
952		✗	if (desc)
953		✗	ctx->video_codec_id = desc->id;
954
955		✗	pix_fmt = av_get_pix_fmt(s->pixel_format);
956
957		✗	if (pix_fmt == AV_PIX_FMT_NONE && !desc) {
958		✗	av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n",
959			s->pixel_format);
960
961		✗	res = AVERROR(EINVAL);
962		✗	goto fail;
963			}
964			}
965
966		✗	if (!s->width && !s->height) {
967		✗	struct v4l2_format fmt = { .type = s->buf_type };
968
969		✗	av_log(ctx, AV_LOG_VERBOSE,
970			"Querying the device for the current frame size\n");
971		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
972		✗	res = AVERROR(errno);
973		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
974		✗	av_err2str(res));
975		✗	goto fail;
976			}
977
978		✗	s->width = fmt.fmt.pix.width;
979		✗	s->height = fmt.fmt.pix.height;
980		✗	av_log(ctx, AV_LOG_VERBOSE,
981			"Setting frame size to %dx%d\n", s->width, s->height);
982			}
983
984		✗	res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
985		✗	if (res < 0)
986		✗	goto fail;
987
988			/* If no pixel_format was specified, the codec_id was not known up
989			* until now. Set video_codec_id in the context, as codec_id will
990			* not be available outside this function
991			*/
992		✗	if (codec_id != AV_CODEC_ID_NONE && ctx->video_codec_id == AV_CODEC_ID_NONE)
993		✗	ctx->video_codec_id = codec_id;
994
995		✗	if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0)
996		✗	goto fail;
997
998		✗	s->pixelformat = desired_format;
999
1000		✗	if ((res = v4l2_set_parameters(ctx)) < 0)
1001		✗	goto fail;
1002
1003		✗	st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
1004		✗	if (st->codecpar->format != AV_PIX_FMT_NONE)
1005		✗	s->frame_size = av_image_get_buffer_size(st->codecpar->format,
1006			s->width, s->height, 1);
1007
1008		✗	if ((res = mmap_init(ctx)) ||
1009		✗	(res = mmap_start(ctx)) < 0)
1010		✗	goto fail;
1011
1012		✗	s->top_field_first = first_field(s);
1013
1014		✗	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
1015		✗	st->codecpar->codec_id = codec_id;
1016		✗	if (codec_id == AV_CODEC_ID_RAWVIDEO)
1017		✗	st->codecpar->codec_tag =
1018		✗	avcodec_pix_fmt_to_codec_tag(st->codecpar->format);
1019		✗	else if (codec_id == AV_CODEC_ID_H264) {
1020		✗	avpriv_stream_set_need_parsing(st, AVSTREAM_PARSE_FULL_ONCE);
1021			}
1022		✗	if (desired_format == V4L2_PIX_FMT_YVU420)
1023		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', '1', '2');
1024		✗	else if (desired_format == V4L2_PIX_FMT_YVU410)
1025		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', 'U', '9');
1026		✗	st->codecpar->width = s->width;
1027		✗	st->codecpar->height = s->height;
1028		✗	if (st->avg_frame_rate.den)
1029		✗	st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
1030
1031		✗	return 0;
1032
1033		✗	fail:
1034		✗	v4l2_close(s->fd);
1035		✗	return res;
1036			}
1037
1038		✗	static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt)
1039			{
1040			int res;
1041
1042		✗	if ((res = mmap_read_frame(ctx, pkt)) < 0) {
1043		✗	return res;
1044			}
1045
1046		✗	return pkt->size;
1047			}
1048
1049		✗	static int v4l2_read_close(AVFormatContext *ctx)
1050			{
1051		✗	struct video_data *s = ctx->priv_data;
1052
1053		✗	if (atomic_load(&s->buffers_queued) != s->buffers)
1054		✗	av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
1055			"close.\n");
1056
1057		✗	mmap_close(s);
1058
1059		✗	ff_timefilter_destroy(s->timefilter);
1060		✗	v4l2_close(s->fd);
1061		✗	return 0;
1062			}
1063
1064		✗	static int v4l2_is_v4l_dev(const char *name)
1065			{
1066		✗	return !strncmp(name, "video", 5) ||
1067		✗	!strncmp(name, "radio", 5) ||
1068		✗	!strncmp(name, "vbi", 3) ||
1069		✗	!strncmp(name, "v4l-subdev", 10);
1070			}
1071
1072		✗	static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_list)
1073			{
1074		✗	struct video_data *s = ctx->priv_data;
1075			DIR *dir;
1076			struct dirent *entry;
1077		✗	int ret = 0;
1078
1079		✗	if (!device_list)
1080		✗	return AVERROR(EINVAL);
1081
1082		✗	dir = opendir("/dev");
1083		✗	if (!dir) {
1084		✗	ret = AVERROR(errno);
1085		✗	av_log(ctx, AV_LOG_ERROR, "Couldn't open the directory: %s\n", av_err2str(ret));
1086		✗	return ret;
1087			}
1088		✗	while ((entry = readdir(dir))) {
1089		✗	AVDeviceInfo *device = NULL;
1090			struct v4l2_capability cap;
1091		✗	int fd = -1, size;
1092			char device_name[256];
1093
1094		✗	if (!v4l2_is_v4l_dev(entry->d_name))
1095		✗	continue;
1096
1097		✗	size = snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
1098		✗	if (size >= sizeof(device_name)) {
1099		✗	av_log(ctx, AV_LOG_ERROR, "Device name too long.\n");
1100		✗	ret = AVERROR(ENOSYS);
1101		✗	break;
1102			}
1103
1104		✗	if ((fd = device_open(ctx, device_name)) < 0)
1105		✗	continue;
1106
1107		✗	if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
1108		✗	ret = AVERROR(errno);
1109		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", av_err2str(ret));
1110		✗	goto fail;
1111			}
1112
1113		✗	device = av_mallocz(sizeof(AVDeviceInfo));
1114		✗	if (!device) {
1115		✗	ret = AVERROR(ENOMEM);
1116		✗	goto fail;
1117			}
1118		✗	device->device_name = av_strdup(device_name);
1119		✗	device->device_description = av_strdup(cap.card);
1120		✗	if (!device->device_name || !device->device_description) {
1121		✗	ret = AVERROR(ENOMEM);
1122		✗	goto fail;
1123			}
1124
1125		✗	if ((ret = av_dynarray_add_nofree(&device_list->devices,
1126			&device_list->nb_devices, device)) < 0)
1127		✗	goto fail;
1128
1129		✗	v4l2_close(fd);
1130		✗	continue;
1131
1132		✗	fail:
1133		✗	if (device) {
1134		✗	av_freep(&device->device_name);
1135		✗	av_freep(&device->device_description);
1136		✗	av_freep(&device);
1137			}
1138		✗	v4l2_close(fd);
1139		✗	break;
1140			}
1141		✗	closedir(dir);
1142		✗	return ret;
1143			}
1144
1145			#define OFFSET(x) offsetof(struct video_data, x)
1146			#define DEC AV_OPT_FLAG_DECODING_PARAM
1147
1148			static const AVOption options[] = {
1149			{ "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
1150			{ "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
1151			{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
1152			{ "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1153			{ "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1154			{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1155
1156			{ "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, .unit = "list_formats" },
1157			{ "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1158			{ "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1159			{ "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1160
1161			{ "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, .unit = "list_standards" },
1162			{ "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, .unit = "list_standards" },
1163
1164			{ "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1165			{ "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1166			{ "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, .unit = "timestamps" },
1167			{ "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, .unit = "timestamps" },
1168			{ "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, .unit = "timestamps" },
1169			{ "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1170			{ NULL },
1171			};
1172
1173			static const AVClass v4l2_class = {
1174			.class_name = "V4L2 indev",
1175			.item_name = av_default_item_name,
1176			.option = options,
1177			.version = LIBAVUTIL_VERSION_INT,
1178			.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
1179			};
1180
1181			const FFInputFormat ff_v4l2_demuxer = {
1182			.p.name = "video4linux2,v4l2",
1183			.p.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
1184			.p.flags = AVFMT_NOFILE,
1185			.p.priv_class = &v4l2_class,
1186			.priv_data_size = sizeof(struct video_data),
1187			.read_probe = v4l2_read_probe,
1188			.read_header = v4l2_read_header,
1189			.read_packet = v4l2_read_packet,
1190			.read_close = v4l2_read_close,
1191			.get_device_list = v4l2_get_device_list,
1192			};
1193