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		✗	while (--n > 0) {
366		✗	v4l2_munmap(s->buf_data[n].start, s->buf_data[n].len);
367			}
368		✗	av_freep(&s->buf_data);
369		✗	}
370
371		✗	static int mmap_init(AVFormatContext *ctx)
372			{
373			int i, res;
374		✗	struct video_data *s = ctx->priv_data;
375		✗	struct v4l2_requestbuffers req = {
376		✗	.type = s->buf_type,
377			.count = desired_video_buffers,
378			.memory = V4L2_MEMORY_MMAP
379			};
380
381		✗	if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) {
382		✗	res = AVERROR(errno);
383		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res));
384		✗	return res;
385			}
386
387		✗	if (req.count < 2) {
388		✗	av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
389		✗	return AVERROR(ENOMEM);
390			}
391		✗	s->buffers = req.count;
392		✗	s->buf_data = av_malloc_array(s->buffers, sizeof(struct buf_data));
393		✗	if (!s->buf_data) {
394		✗	av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer data\n");
395		✗	return AVERROR(ENOMEM);
396			}
397
398		✗	for (i = 0; i < req.count; i++) {
399			unsigned int buf_length, buf_offset;
400			struct v4l2_plane planes[VIDEO_MAX_PLANES];
401		✗	struct v4l2_buffer buf = {
402		✗	.type = s->buf_type,
403			.index = i,
404			.memory = V4L2_MEMORY_MMAP,
405		✗	.m.planes = s->multiplanar ? planes : NULL,
406		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
407			};
408		✗	if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) {
409		✗	res = AVERROR(errno);
410		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res));
411		✗	goto fail;
412			}
413
414		✗	if (s->multiplanar) {
415		✗	if (buf.length != 1) {
416		✗	av_log(ctx, AV_LOG_ERROR, "multiplanar only supported when buf.length == 1\n");
417		✗	res = AVERROR_PATCHWELCOME;
418		✗	goto fail;
419			}
420		✗	buf_length = buf.m.planes[0].length;
421		✗	buf_offset = buf.m.planes[0].m.mem_offset;
422			} else {
423		✗	buf_length = buf.length;
424		✗	buf_offset = buf.m.offset;
425			}
426
427		✗	s->buf_data[i].len = buf_length;
428		✗	if (s->frame_size > 0 && s->buf_data[i].len < s->frame_size) {
429		✗	av_log(ctx, AV_LOG_ERROR,
430			"buf_data[%d].len = %d < expected frame size %d\n",
431			i, buf_length, s->frame_size);
432		✗	res = AVERROR(ENOMEM);
433		✗	goto fail;
434			}
435		✗	s->buf_data[i].start = v4l2_mmap(NULL, buf_length,
436			PROT_READ | PROT_WRITE, MAP_SHARED,
437			s->fd, buf_offset);
438
439		✗	if (s->buf_data[i].start == MAP_FAILED) {
440		✗	res = AVERROR(errno);
441		✗	av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res));
442		✗	goto fail;
443			}
444			}
445
446		✗	return 0;
447
448		✗	fail:
449		✗	mmap_free(s, i);
450		✗	return res;
451			}
452
453		✗	static int enqueue_buffer(struct video_data *s, struct v4l2_buffer *buf)
454			{
455		✗	int res = 0;
456
457		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, buf) < 0) {
458		✗	res = AVERROR(errno);
459		✗	av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res));
460			} else {
461		✗	atomic_fetch_add(&s->buffers_queued, 1);
462			}
463
464		✗	return res;
465			}
466
467		✗	static void mmap_release_buffer(void *opaque, uint8_t *data)
468			{
469			struct v4l2_plane planes[VIDEO_MAX_PLANES];
470		✗	struct v4l2_buffer buf = { 0 };
471		✗	struct buf_desc *buf_descriptor = opaque;
472		✗	struct video_data *s = buf_descriptor->s;
473
474		✗	buf.type = s->buf_type;
475		✗	buf.memory = V4L2_MEMORY_MMAP;
476		✗	buf.index = buf_descriptor->index;
477		✗	buf.m.planes = s->multiplanar ? planes : NULL;
478		✗	buf.length = s->multiplanar ? VIDEO_MAX_PLANES : 0;
479		✗	av_free(buf_descriptor);
480
481		✗	enqueue_buffer(s, &buf);
482		✗	}
483
484			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
485		✗	static int64_t av_gettime_monotonic(void)
486			{
487		✗	return av_gettime_relative();
488			}
489			#endif
490
491		✗	static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
492			{
493		✗	struct video_data *s = ctx->priv_data;
494			int64_t now;
495
496		✗	now = av_gettime();
497		✗	if (s->ts_mode == V4L_TS_ABS &&
498		✗	ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
499		✗	av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
500		✗	s->ts_mode = V4L_TS_CONVERT_READY;
501		✗	return 0;
502			}
503			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
504		✗	if (ctx->streams[0]->avg_frame_rate.num) {
505		✗	now = av_gettime_monotonic();
506		✗	if (s->ts_mode == V4L_TS_MONO2ABS ||
507		✗	(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
508		✗	AVRational tb = {AV_TIME_BASE, 1};
509		✗	int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate);
510		✗	av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
511			/* microseconds instead of seconds, MHz instead of Hz */
512		✗	s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
513		✗	if (!s->timefilter)
514		✗	return AVERROR(ENOMEM);
515		✗	s->ts_mode = V4L_TS_CONVERT_READY;
516		✗	return 0;
517			}
518			}
519			#endif
520		✗	av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
521		✗	return AVERROR(EIO);
522			}
523
524		✗	static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
525			{
526		✗	struct video_data *s = ctx->priv_data;
527
528		✗	if (s->ts_mode) {
529		✗	int r = init_convert_timestamp(ctx, *ts);
530		✗	if (r < 0)
531		✗	return r;
532			}
533			#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
534		✗	if (s->timefilter) {
535		✗	int64_t nowa = av_gettime();
536		✗	int64_t nowm = av_gettime_monotonic();
537		✗	ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
538		✗	s->last_time_m = nowm;
539		✗	*ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
540			}
541			#endif
542		✗	return 0;
543			}
544
545		✗	static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
546			{
547		✗	struct video_data *s = ctx->priv_data;
548			struct v4l2_plane planes[VIDEO_MAX_PLANES];
549		✗	struct v4l2_buffer buf = {
550		✗	.type = s->buf_type,
551			.memory = V4L2_MEMORY_MMAP,
552		✗	.m.planes = s->multiplanar ? planes : NULL,
553		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
554			};
555			struct timeval buf_ts;
556			unsigned int bytesused;
557			int res;
558
559		✗	pkt->size = 0;
560
561			/* FIXME: Some special treatment might be needed in case of loss of signal... */
562		✗	while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
563		✗	if (res < 0) {
564		✗	if (errno == EAGAIN)
565		✗	return AVERROR(EAGAIN);
566
567		✗	res = AVERROR(errno);
568		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
569		✗	av_err2str(res));
570		✗	return res;
571			}
572
573		✗	buf_ts = buf.timestamp;
574
575		✗	if (buf.index >= s->buffers) {
576		✗	av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
577		✗	return AVERROR(EINVAL);
578			}
579		✗	atomic_fetch_add(&s->buffers_queued, -1);
580			// always keep at least one buffer queued
581		✗	av_assert0(atomic_load(&s->buffers_queued) >= 1);
582
583		✗	bytesused = s->multiplanar ? buf.m.planes[0].bytesused : buf.bytesused;
584
585			#ifdef V4L2_BUF_FLAG_ERROR
586		✗	if (buf.flags & V4L2_BUF_FLAG_ERROR) {
587		✗	av_log(ctx, AV_LOG_WARNING,
588			"Dequeued v4l2 buffer contains corrupted data (%d bytes).\n",
589			bytesused);
590		✗	bytesused = 0;
591			} else
592			#endif
593			{
594			/* CPIA is a compressed format and we don't know the exact number of bytes
595			* used by a frame, so set it here as the driver announces it. */
596		✗	if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
597		✗	s->frame_size = bytesused;
598
599		✗	if (s->frame_size > 0 && bytesused != s->frame_size) {
600		✗	av_log(ctx, AV_LOG_WARNING,
601			"Dequeued v4l2 buffer contains %d bytes, but %d were expected. Flags: 0x%08X.\n",
602			bytesused, s->frame_size, buf.flags);
603		✗	bytesused = 0;
604			}
605			}
606
607			/* Image is at s->buf_data[buf.index].start */
608		✗	if (atomic_load(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
609			/* when we start getting low on queued buffers, fall back on copying data */
610		✗	res = av_new_packet(pkt, bytesused);
611		✗	if (res < 0) {
612		✗	av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
613		✗	enqueue_buffer(s, &buf);
614		✗	return res;
615			}
616		✗	memcpy(pkt->data, s->buf_data[buf.index].start, bytesused);
617
618		✗	res = enqueue_buffer(s, &buf);
619		✗	if (res) {
620		✗	av_packet_unref(pkt);
621		✗	return res;
622			}
623			} else {
624			struct buf_desc *buf_descriptor;
625
626		✗	pkt->data = s->buf_data[buf.index].start;
627		✗	pkt->size = bytesused;
628
629		✗	buf_descriptor = av_malloc(sizeof(struct buf_desc));
630		✗	if (!buf_descriptor) {
631			/* Something went wrong... Since av_malloc() failed, we cannot even
632			* allocate a buffer for memcpying into it
633			*/
634		✗	av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
635		✗	enqueue_buffer(s, &buf);
636
637		✗	return AVERROR(ENOMEM);
638			}
639		✗	buf_descriptor->index = buf.index;
640		✗	buf_descriptor->s = s;
641
642		✗	pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
643			buf_descriptor, 0);
644		✗	if (!pkt->buf) {
645		✗	av_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n");
646		✗	enqueue_buffer(s, &buf);
647		✗	av_freep(&buf_descriptor);
648		✗	return AVERROR(ENOMEM);
649			}
650			}
651		✗	pkt->pts = buf_ts.tv_sec * INT64_C(1000000) + buf_ts.tv_usec;
652		✗	convert_timestamp(ctx, &pkt->pts);
653
654		✗	return pkt->size;
655			}
656
657		✗	static int mmap_start(AVFormatContext *ctx)
658			{
659		✗	struct video_data *s = ctx->priv_data;
660			enum v4l2_buf_type type;
661			int i, res;
662
663		✗	for (i = 0; i < s->buffers; i++) {
664			struct v4l2_plane planes[VIDEO_MAX_PLANES];
665		✗	struct v4l2_buffer buf = {
666		✗	.type = s->buf_type,
667			.index = i,
668			.memory = V4L2_MEMORY_MMAP,
669		✗	.m.planes = s->multiplanar ? planes : NULL,
670		✗	.length = s->multiplanar ? VIDEO_MAX_PLANES : 0,
671			};
672
673		✗	if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) {
674		✗	res = AVERROR(errno);
675		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
676		✗	av_err2str(res));
677		✗	return res;
678			}
679			}
680		✗	atomic_store(&s->buffers_queued, s->buffers);
681
682		✗	type = s->buf_type;
683		✗	if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) {
684		✗	res = AVERROR(errno);
685		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
686		✗	av_err2str(res));
687		✗	return res;
688			}
689
690		✗	return 0;
691			}
692
693		✗	static void mmap_close(struct video_data *s)
694			{
695			enum v4l2_buf_type type;
696
697		✗	type = s->buf_type;
698			/* We do not check for the result, because we could
699			* not do anything about it anyway...
700			*/
701		✗	v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
702		✗	mmap_free(s, s->buffers);
703		✗	}
704
705		✗	static int v4l2_set_parameters(AVFormatContext *ctx)
706			{
707		✗	struct video_data *s = ctx->priv_data;
708		✗	struct v4l2_standard standard = { 0 };
709		✗	struct v4l2_streamparm streamparm = { 0 };
710			struct v4l2_fract *tpf;
711		✗	AVRational framerate_q = { 0 };
712			int i, ret;
713
714		✗	if (s->framerate &&
715		✗	(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
716		✗	av_log(ctx, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
717			s->framerate);
718		✗	return ret;
719			}
720
721		✗	if (s->standard) {
722		✗	if (s->std_id) {
723		✗	ret = 0;
724		✗	av_log(ctx, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard);
725			/* set tv standard */
726		✗	for (i = 0; ; i++) {
727		✗	standard.index = i;
728		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
729		✗	ret = AVERROR(errno);
730		✗	break;
731			}
732		✗	if (!av_strcasecmp(standard.name, s->standard))
733		✗	break;
734			}
735		✗	if (ret < 0) {
736		✗	av_log(ctx, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard);
737		✗	return ret;
738			}
739
740		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
741		✗	ret = AVERROR(errno);
742		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret));
743		✗	return ret;
744			}
745			} else {
746		✗	av_log(ctx, AV_LOG_WARNING,
747			"This device does not support any standard\n");
748			}
749			}
750
751			/* get standard */
752		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) {
753		✗	tpf = &standard.frameperiod;
754		✗	for (i = 0; ; i++) {
755		✗	standard.index = i;
756		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) {
757		✗	ret = AVERROR(errno);
758		✗	if (ret == AVERROR(EINVAL)
759			#ifdef ENODATA
760		✗	|| ret == AVERROR(ENODATA)
761			#endif
762			) {
763		✗	tpf = &streamparm.parm.capture.timeperframe;
764		✗	break;
765			}
766		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret));
767		✗	return ret;
768			}
769		✗	if (standard.id == s->std_id) {
770		✗	av_log(ctx, AV_LOG_DEBUG,
771			"Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n",
772		✗	standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator);
773		✗	break;
774			}
775			}
776			} else {
777		✗	tpf = &streamparm.parm.capture.timeperframe;
778			}
779
780		✗	streamparm.type = s->buf_type;
781		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) {
782		✗	ret = AVERROR(errno);
783		✗	av_log(ctx, AV_LOG_WARNING, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret));
784		✗	} else if (framerate_q.num && framerate_q.den) {
785		✗	if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) {
786		✗	tpf = &streamparm.parm.capture.timeperframe;
787
788		✗	av_log(ctx, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
789			framerate_q.den, framerate_q.num);
790		✗	tpf->numerator = framerate_q.den;
791		✗	tpf->denominator = framerate_q.num;
792
793		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) {
794		✗	ret = AVERROR(errno);
795		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n",
796		✗	av_err2str(ret));
797		✗	return ret;
798			}
799
800		✗	if (framerate_q.num != tpf->denominator ||
801		✗	framerate_q.den != tpf->numerator) {
802		✗	av_log(ctx, AV_LOG_INFO,
803			"The driver changed the time per frame from "
804			"%d/%d to %d/%d\n",
805			framerate_q.den, framerate_q.num,
806			tpf->numerator, tpf->denominator);
807			}
808			} else {
809		✗	av_log(ctx, AV_LOG_WARNING,
810			"The driver does not permit changing the time per frame\n");
811			}
812			}
813		✗	if (tpf->denominator > 0 && tpf->numerator > 0) {
814		✗	ctx->streams[0]->avg_frame_rate.num = tpf->denominator;
815		✗	ctx->streams[0]->avg_frame_rate.den = tpf->numerator;
816		✗	ctx->streams[0]->r_frame_rate = ctx->streams[0]->avg_frame_rate;
817			} else
818		✗	av_log(ctx, AV_LOG_WARNING, "Time per frame unknown\n");
819
820		✗	return 0;
821			}
822
823		✗	static int device_try_init(AVFormatContext *ctx,
824			enum AVPixelFormat pix_fmt,
825			int *width,
826			int *height,
827			uint32_t *desired_format,
828			enum AVCodecID *codec_id)
829			{
830			int ret, i;
831
832		✗	*desired_format = ff_fmt_ff2v4l(pix_fmt, ctx->video_codec_id);
833
834		✗	if (*desired_format) {
835		✗	ret = device_init(ctx, width, height, *desired_format);
836		✗	if (ret < 0) {
837		✗	*desired_format = 0;
838		✗	if (ret != AVERROR(EINVAL))
839		✗	return ret;
840			}
841			}
842
843		✗	if (!*desired_format) {
844		✗	for (i = 0; ff_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) {
845		✗	if (ctx->video_codec_id == AV_CODEC_ID_NONE ||
846		✗	ff_fmt_conversion_table[i].codec_id == ctx->video_codec_id) {
847		✗	av_log(ctx, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
848		✗	avcodec_get_name(ff_fmt_conversion_table[i].codec_id),
849		✗	(char *)av_x_if_null(av_get_pix_fmt_name(ff_fmt_conversion_table[i].ff_fmt), "none"));
850
851		✗	*desired_format = ff_fmt_conversion_table[i].v4l2_fmt;
852		✗	ret = device_init(ctx, width, height, *desired_format);
853		✗	if (ret >= 0)
854		✗	break;
855		✗	else if (ret != AVERROR(EINVAL))
856		✗	return ret;
857		✗	*desired_format = 0;
858			}
859			}
860
861		✗	if (*desired_format == 0) {
862		✗	av_log(ctx, AV_LOG_ERROR, "Cannot find a proper format for "
863			"codec '%s' (id %d), pixel format '%s' (id %d)\n",
864		✗	avcodec_get_name(ctx->video_codec_id), ctx->video_codec_id,
865		✗	(char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
866		✗	ret = AVERROR(EINVAL);
867			}
868			}
869
870		✗	*codec_id = ff_fmt_v4l2codec(*desired_format);
871		✗	if (*codec_id == AV_CODEC_ID_NONE)
872		✗	av_assert0(ret == AVERROR(EINVAL));
873		✗	return ret;
874			}
875
876		3836	static int v4l2_read_probe(const AVProbeData *p)
877			{
878	1/2 ✗ Branch 1 not taken. ✓ Branch 2 taken 3836 times.	3836	if (av_strstart(p->filename, "/dev/video", NULL))
879		✗	return AVPROBE_SCORE_MAX - 1;
880		3836	return 0;
881			}
882
883		✗	static int v4l2_read_header(AVFormatContext *ctx)
884			{
885		✗	struct video_data *s = ctx->priv_data;
886			AVStream *st;
887		✗	int res = 0;
888			uint32_t desired_format;
889		✗	enum AVCodecID codec_id = AV_CODEC_ID_NONE;
890		✗	enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
891		✗	struct v4l2_input input = { 0 };
892
893		✗	st = avformat_new_stream(ctx, NULL);
894		✗	if (!st)
895		✗	return AVERROR(ENOMEM);
896
897			#if CONFIG_LIBV4L2
898			/* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
899			and errors will get sent to stderr */
900			if (s->use_libv4l2)
901			v4l2_log_file = fopen("/dev/null", "w");
902			#endif
903
904		✗	s->fd = device_open(ctx, ctx->url);
905		✗	if (s->fd < 0)
906		✗	return s->fd;
907
908		✗	if (s->channel != -1) {
909			/* set video input */
910		✗	av_log(ctx, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
911		✗	if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
912		✗	res = AVERROR(errno);
913		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res));
914		✗	goto fail;
915			}
916			} else {
917			/* get current video input */
918		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) {
919		✗	res = AVERROR(errno);
920		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res));
921		✗	goto fail;
922			}
923			}
924
925			/* enum input */
926		✗	input.index = s->channel;
927		✗	if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
928		✗	res = AVERROR(errno);
929		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res));
930		✗	goto fail;
931			}
932		✗	s->std_id = input.std;
933		✗	av_log(ctx, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n",
934		✗	s->channel, input.name, (uint64_t)input.std);
935
936		✗	if (s->list_format) {
937		✗	list_formats(ctx, s->list_format);
938		✗	res = AVERROR_EXIT;
939		✗	goto fail;
940			}
941
942		✗	if (s->list_standard) {
943		✗	list_standards(ctx);
944		✗	res = AVERROR_EXIT;
945		✗	goto fail;
946			}
947
948		✗	avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
949
950		✗	if (s->pixel_format) {
951		✗	const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(s->pixel_format);
952
953		✗	if (desc)
954		✗	ctx->video_codec_id = desc->id;
955
956		✗	pix_fmt = av_get_pix_fmt(s->pixel_format);
957
958		✗	if (pix_fmt == AV_PIX_FMT_NONE && !desc) {
959		✗	av_log(ctx, AV_LOG_ERROR, "No such input format: %s.\n",
960			s->pixel_format);
961
962		✗	res = AVERROR(EINVAL);
963		✗	goto fail;
964			}
965			}
966
967		✗	if (!s->width && !s->height) {
968		✗	struct v4l2_format fmt = { .type = s->buf_type };
969
970		✗	av_log(ctx, AV_LOG_VERBOSE,
971			"Querying the device for the current frame size\n");
972		✗	if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
973		✗	res = AVERROR(errno);
974		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
975		✗	av_err2str(res));
976		✗	goto fail;
977			}
978
979		✗	s->width = fmt.fmt.pix.width;
980		✗	s->height = fmt.fmt.pix.height;
981		✗	av_log(ctx, AV_LOG_VERBOSE,
982			"Setting frame size to %dx%d\n", s->width, s->height);
983			}
984
985		✗	res = device_try_init(ctx, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
986		✗	if (res < 0)
987		✗	goto fail;
988
989			/* If no pixel_format was specified, the codec_id was not known up
990			* until now. Set video_codec_id in the context, as codec_id will
991			* not be available outside this function
992			*/
993		✗	if (codec_id != AV_CODEC_ID_NONE && ctx->video_codec_id == AV_CODEC_ID_NONE)
994		✗	ctx->video_codec_id = codec_id;
995
996		✗	if ((res = av_image_check_size(s->width, s->height, 0, ctx)) < 0)
997		✗	goto fail;
998
999		✗	s->pixelformat = desired_format;
1000
1001		✗	if ((res = v4l2_set_parameters(ctx)) < 0)
1002		✗	goto fail;
1003
1004		✗	st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
1005		✗	if (st->codecpar->format != AV_PIX_FMT_NONE)
1006		✗	s->frame_size = av_image_get_buffer_size(st->codecpar->format,
1007			s->width, s->height, 1);
1008
1009		✗	if ((res = mmap_init(ctx)) ||
1010		✗	(res = mmap_start(ctx)) < 0)
1011		✗	goto fail;
1012
1013		✗	s->top_field_first = first_field(s);
1014
1015		✗	st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
1016		✗	st->codecpar->codec_id = codec_id;
1017		✗	if (codec_id == AV_CODEC_ID_RAWVIDEO)
1018		✗	st->codecpar->codec_tag =
1019		✗	avcodec_pix_fmt_to_codec_tag(st->codecpar->format);
1020		✗	else if (codec_id == AV_CODEC_ID_H264) {
1021		✗	avpriv_stream_set_need_parsing(st, AVSTREAM_PARSE_FULL_ONCE);
1022			}
1023		✗	if (desired_format == V4L2_PIX_FMT_YVU420)
1024		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', '1', '2');
1025		✗	else if (desired_format == V4L2_PIX_FMT_YVU410)
1026		✗	st->codecpar->codec_tag = MKTAG('Y', 'V', 'U', '9');
1027		✗	st->codecpar->width = s->width;
1028		✗	st->codecpar->height = s->height;
1029		✗	if (st->avg_frame_rate.den)
1030		✗	st->codecpar->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
1031
1032		✗	return 0;
1033
1034		✗	fail:
1035		✗	v4l2_close(s->fd);
1036		✗	return res;
1037			}
1038
1039		✗	static int v4l2_read_packet(AVFormatContext *ctx, AVPacket *pkt)
1040			{
1041			int res;
1042
1043		✗	if ((res = mmap_read_frame(ctx, pkt)) < 0) {
1044		✗	return res;
1045			}
1046
1047		✗	return pkt->size;
1048			}
1049
1050		✗	static int v4l2_read_close(AVFormatContext *ctx)
1051			{
1052		✗	struct video_data *s = ctx->priv_data;
1053
1054		✗	if (atomic_load(&s->buffers_queued) != s->buffers)
1055		✗	av_log(ctx, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
1056			"close.\n");
1057
1058		✗	mmap_close(s);
1059
1060		✗	ff_timefilter_destroy(s->timefilter);
1061		✗	v4l2_close(s->fd);
1062		✗	return 0;
1063			}
1064
1065		✗	static int v4l2_is_v4l_dev(const char *name)
1066			{
1067		✗	return !strncmp(name, "video", 5) ||
1068		✗	!strncmp(name, "radio", 5) ||
1069		✗	!strncmp(name, "vbi", 3) ||
1070		✗	!strncmp(name, "v4l-subdev", 10);
1071			}
1072
1073		✗	static int v4l2_get_device_list(AVFormatContext *ctx, AVDeviceInfoList *device_list)
1074			{
1075		✗	struct video_data *s = ctx->priv_data;
1076			DIR *dir;
1077			struct dirent *entry;
1078		✗	int ret = 0;
1079
1080		✗	if (!device_list)
1081		✗	return AVERROR(EINVAL);
1082
1083		✗	dir = opendir("/dev");
1084		✗	if (!dir) {
1085		✗	ret = AVERROR(errno);
1086		✗	av_log(ctx, AV_LOG_ERROR, "Couldn't open the directory: %s\n", av_err2str(ret));
1087		✗	return ret;
1088			}
1089		✗	while ((entry = readdir(dir))) {
1090		✗	AVDeviceInfo *device = NULL;
1091			struct v4l2_capability cap;
1092		✗	int fd = -1, size;
1093			char device_name[256];
1094
1095		✗	if (!v4l2_is_v4l_dev(entry->d_name))
1096		✗	continue;
1097
1098		✗	size = snprintf(device_name, sizeof(device_name), "/dev/%s", entry->d_name);
1099		✗	if (size >= sizeof(device_name)) {
1100		✗	av_log(ctx, AV_LOG_ERROR, "Device name too long.\n");
1101		✗	ret = AVERROR(ENOSYS);
1102		✗	break;
1103			}
1104
1105		✗	if ((fd = device_open(ctx, device_name)) < 0)
1106		✗	continue;
1107
1108		✗	if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
1109		✗	ret = AVERROR(errno);
1110		✗	av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", av_err2str(ret));
1111		✗	goto fail;
1112			}
1113
1114		✗	device = av_mallocz(sizeof(AVDeviceInfo));
1115		✗	if (!device) {
1116		✗	ret = AVERROR(ENOMEM);
1117		✗	goto fail;
1118			}
1119		✗	device->device_name = av_strdup(device_name);
1120		✗	device->device_description = av_strdup(cap.card);
1121		✗	if (!device->device_name || !device->device_description) {
1122		✗	ret = AVERROR(ENOMEM);
1123		✗	goto fail;
1124			}
1125
1126		✗	if ((ret = av_dynarray_add_nofree(&device_list->devices,
1127			&device_list->nb_devices, device)) < 0)
1128		✗	goto fail;
1129
1130		✗	v4l2_close(fd);
1131		✗	continue;
1132
1133		✗	fail:
1134		✗	if (device) {
1135		✗	av_freep(&device->device_name);
1136		✗	av_freep(&device->device_description);
1137		✗	av_freep(&device);
1138			}
1139		✗	v4l2_close(fd);
1140		✗	break;
1141			}
1142		✗	closedir(dir);
1143		✗	return ret;
1144			}
1145
1146			#define OFFSET(x) offsetof(struct video_data, x)
1147			#define DEC AV_OPT_FLAG_DECODING_PARAM
1148
1149			static const AVOption options[] = {
1150			{ "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
1151			{ "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC },
1152			{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
1153			{ "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1154			{ "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1155			{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
1156
1157			{ "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, .unit = "list_formats" },
1158			{ "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1159			{ "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1160			{ "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, .unit = "list_formats" },
1161
1162			{ "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, .unit = "list_standards" },
1163			{ "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, .unit = "list_standards" },
1164
1165			{ "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1166			{ "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, .unit = "timestamps" },
1167			{ "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, .unit = "timestamps" },
1168			{ "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, .unit = "timestamps" },
1169			{ "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, .unit = "timestamps" },
1170			{ "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
1171			{ NULL },
1172			};
1173
1174			static const AVClass v4l2_class = {
1175			.class_name = "V4L2 indev",
1176			.item_name = av_default_item_name,
1177			.option = options,
1178			.version = LIBAVUTIL_VERSION_INT,
1179			.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
1180			};
1181
1182			const FFInputFormat ff_v4l2_demuxer = {
1183			.p.name = "video4linux2,v4l2",
1184			.p.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
1185			.p.flags = AVFMT_NOFILE,
1186			.p.priv_class = &v4l2_class,
1187			.priv_data_size = sizeof(struct video_data),
1188			.read_probe = v4l2_read_probe,
1189			.read_header = v4l2_read_header,
1190			.read_packet = v4l2_read_packet,
1191			.read_close = v4l2_read_close,
1192			.get_device_list = v4l2_get_device_list,
1193			};
1194