2 * Copyright (c) 2000,2001 Fabrice Bellard
3 * Copyright (c) 2006 Luca Abeni
5 * This file is part of FFmpeg.
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.
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.
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
24 * Video4Linux2 grab interface
26 * Part of this file is based on the V4L2 video capture example
27 * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html)
29 * Thanks to Michael Niedermayer for providing the mapping between
30 * V4L2_PIX_FMT_* and AV_PIX_FMT_*
33 #include "v4l2-common.h"
39 static const int desired_video_buffers
= 256;
41 #define V4L_ALLFORMATS 3
42 #define V4L_RAWFORMATS 1
43 #define V4L_COMPFORMATS 2
46 * Return timestamps to the user exactly as returned by the kernel
48 #define V4L_TS_DEFAULT 0
50 * Autodetect the kind of timestamps returned by the kernel and convert to
51 * absolute (wall clock) timestamps.
55 * Assume kernel timestamps are from the monotonic clock and convert to
56 * absolute timestamps.
58 #define V4L_TS_MONO2ABS 2
61 * Once the kind of timestamps returned by the kernel have been detected,
62 * the value of the timefilter (NULL or not) determines whether a conversion
65 #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
70 int frame_format
; /* V4L2_PIX_FMT_* */
76 TimeFilter
*timefilter
;
80 volatile int buffers_queued
;
82 unsigned int *buf_len
;
86 char *pixel_format
; /**< Set by a private option. */
87 int list_format
; /**< Set by a private option. */
88 int list_standard
; /**< Set by a private option. */
89 char *framerate
; /**< Set by a private option. */
92 int (*open_f
)(const char *file
, int oflag
, ...);
93 int (*close_f
)(int fd
);
95 int (*ioctl_f
)(int fd
, unsigned long int request
, ...);
96 ssize_t (*read_f
)(int fd
, void *buffer
, size_t n
);
97 void *(*mmap_f
)(void *start
, size_t length
, int prot
, int flags
, int fd
, int64_t offset
);
98 int (*munmap_f
)(void *_start
, size_t length
);
102 struct video_data
*s
;
106 static int device_open(AVFormatContext
*ctx
)
108 struct video_data
*s
= ctx
->priv_data
;
109 struct v4l2_capability cap
;
114 #define SET_WRAPPERS(prefix) do { \
115 s->open_f = prefix ## open; \
116 s->close_f = prefix ## close; \
117 s->dup_f = prefix ## dup; \
118 s->ioctl_f = prefix ## ioctl; \
119 s->read_f = prefix ## read; \
120 s->mmap_f = prefix ## mmap; \
121 s->munmap_f = prefix ## munmap; \
124 if (s
->use_libv4l2
) {
128 av_log(ctx
, AV_LOG_ERROR
, "libavdevice is not build with libv4l2 support.\n");
129 return AVERROR(EINVAL
);
135 #define v4l2_open s->open_f
136 #define v4l2_close s->close_f
137 #define v4l2_dup s->dup_f
138 #define v4l2_ioctl s->ioctl_f
139 #define v4l2_read s->read_f
140 #define v4l2_mmap s->mmap_f
141 #define v4l2_munmap s->munmap_f
143 if (ctx
->flags
& AVFMT_FLAG_NONBLOCK
) {
147 fd
= v4l2_open(ctx
->filename
, flags
, 0);
149 ret
= AVERROR(errno
);
150 av_log(ctx
, AV_LOG_ERROR
, "Cannot open video device %s: %s\n",
151 ctx
->filename
, av_err2str(ret
));
155 if (v4l2_ioctl(fd
, VIDIOC_QUERYCAP
, &cap
) < 0) {
156 ret
= AVERROR(errno
);
157 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_QUERYCAP): %s\n",
162 av_log(ctx
, AV_LOG_VERBOSE
, "fd:%d capabilities:%x\n",
163 fd
, cap
.capabilities
);
165 if (!(cap
.capabilities
& V4L2_CAP_VIDEO_CAPTURE
)) {
166 av_log(ctx
, AV_LOG_ERROR
, "Not a video capture device.\n");
167 ret
= AVERROR(ENODEV
);
171 if (!(cap
.capabilities
& V4L2_CAP_STREAMING
)) {
172 av_log(ctx
, AV_LOG_ERROR
,
173 "The device does not support the streaming I/O method.\n");
174 ret
= AVERROR(ENOSYS
);
185 static int device_init(AVFormatContext
*ctx
, int *width
, int *height
,
188 struct video_data
*s
= ctx
->priv_data
;
189 struct v4l2_format fmt
= { .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
};
190 struct v4l2_pix_format
*pix
= &fmt
.fmt
.pix
;
194 pix
->height
= *height
;
195 pix
->pixelformat
= pix_fmt
;
196 pix
->field
= V4L2_FIELD_ANY
;
198 if (v4l2_ioctl(s
->fd
, VIDIOC_S_FMT
, &fmt
) < 0)
199 res
= AVERROR(errno
);
201 if ((*width
!= fmt
.fmt
.pix
.width
) || (*height
!= fmt
.fmt
.pix
.height
)) {
202 av_log(ctx
, AV_LOG_INFO
,
203 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
204 *width
, *height
, fmt
.fmt
.pix
.width
, fmt
.fmt
.pix
.height
);
205 *width
= fmt
.fmt
.pix
.width
;
206 *height
= fmt
.fmt
.pix
.height
;
209 if (pix_fmt
!= fmt
.fmt
.pix
.pixelformat
) {
210 av_log(ctx
, AV_LOG_DEBUG
,
211 "The V4L2 driver changed the pixel format "
212 "from 0x%08X to 0x%08X\n",
213 pix_fmt
, fmt
.fmt
.pix
.pixelformat
);
214 res
= AVERROR(EINVAL
);
217 if (fmt
.fmt
.pix
.field
== V4L2_FIELD_INTERLACED
) {
218 av_log(ctx
, AV_LOG_DEBUG
,
219 "The V4L2 driver is using the interlaced mode\n");
226 static int first_field(const struct video_data
*s
)
231 res
= v4l2_ioctl(s
->fd
, VIDIOC_G_STD
, &std
);
234 if (std
& V4L2_STD_NTSC
)
240 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
241 static void list_framesizes(AVFormatContext
*ctx
, uint32_t pixelformat
)
243 const struct video_data
*s
= ctx
->priv_data
;
244 struct v4l2_frmsizeenum vfse
= { .pixel_format
= pixelformat
};
246 while(!v4l2_ioctl(s
->fd
, VIDIOC_ENUM_FRAMESIZES
, &vfse
)) {
248 case V4L2_FRMSIZE_TYPE_DISCRETE
:
249 av_log(ctx
, AV_LOG_INFO
, " %ux%u",
250 vfse
.discrete
.width
, vfse
.discrete
.height
);
252 case V4L2_FRMSIZE_TYPE_CONTINUOUS
:
253 case V4L2_FRMSIZE_TYPE_STEPWISE
:
254 av_log(ctx
, AV_LOG_INFO
, " {%u-%u, %u}x{%u-%u, %u}",
255 vfse
.stepwise
.min_width
,
256 vfse
.stepwise
.max_width
,
257 vfse
.stepwise
.step_width
,
258 vfse
.stepwise
.min_height
,
259 vfse
.stepwise
.max_height
,
260 vfse
.stepwise
.step_height
);
267 static void list_formats(AVFormatContext
*ctx
, int type
)
269 const struct video_data
*s
= ctx
->priv_data
;
270 struct v4l2_fmtdesc vfd
= { .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
};
272 while(!v4l2_ioctl(s
->fd
, VIDIOC_ENUM_FMT
, &vfd
)) {
273 enum AVCodecID codec_id
= avpriv_fmt_v4l2codec(vfd
.pixelformat
);
274 enum AVPixelFormat pix_fmt
= avpriv_fmt_v4l2ff(vfd
.pixelformat
, codec_id
);
278 if (!(vfd
.flags
& V4L2_FMT_FLAG_COMPRESSED
) &&
279 type
& V4L_RAWFORMATS
) {
280 const char *fmt_name
= av_get_pix_fmt_name(pix_fmt
);
281 av_log(ctx
, AV_LOG_INFO
, "Raw : %9s : %20s :",
282 fmt_name
? fmt_name
: "Unsupported",
284 } else if (vfd
.flags
& V4L2_FMT_FLAG_COMPRESSED
&&
285 type
& V4L_COMPFORMATS
) {
286 AVCodec
*codec
= avcodec_find_decoder(codec_id
);
287 av_log(ctx
, AV_LOG_INFO
, "Compressed: %9s : %20s :",
288 codec
? codec
->name
: "Unsupported",
294 #ifdef V4L2_FMT_FLAG_EMULATED
295 if (vfd
.flags
& V4L2_FMT_FLAG_EMULATED
)
296 av_log(ctx
, AV_LOG_INFO
, " Emulated :");
298 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
299 list_framesizes(ctx
, vfd
.pixelformat
);
301 av_log(ctx
, AV_LOG_INFO
, "\n");
305 static void list_standards(AVFormatContext
*ctx
)
308 struct video_data
*s
= ctx
->priv_data
;
309 struct v4l2_standard standard
;
314 for (standard
.index
= 0; ; standard
.index
++) {
315 if (v4l2_ioctl(s
->fd
, VIDIOC_ENUMSTD
, &standard
) < 0) {
316 ret
= AVERROR(errno
);
317 if (ret
== AVERROR(EINVAL
)) {
320 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret
));
324 av_log(ctx
, AV_LOG_INFO
, "%2d, %16"PRIx64
", %s\n",
325 standard
.index
, (uint64_t)standard
.id
, standard
.name
);
329 static int mmap_init(AVFormatContext
*ctx
)
332 struct video_data
*s
= ctx
->priv_data
;
333 struct v4l2_requestbuffers req
= {
334 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
335 .count
= desired_video_buffers
,
336 .memory
= V4L2_MEMORY_MMAP
339 if (v4l2_ioctl(s
->fd
, VIDIOC_REQBUFS
, &req
) < 0) {
340 res
= AVERROR(errno
);
341 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res
));
346 av_log(ctx
, AV_LOG_ERROR
, "Insufficient buffer memory\n");
347 return AVERROR(ENOMEM
);
349 s
->buffers
= req
.count
;
350 s
->buf_start
= av_malloc_array(s
->buffers
, sizeof(void *));
352 av_log(ctx
, AV_LOG_ERROR
, "Cannot allocate buffer pointers\n");
353 return AVERROR(ENOMEM
);
355 s
->buf_len
= av_malloc_array(s
->buffers
, sizeof(unsigned int));
357 av_log(ctx
, AV_LOG_ERROR
, "Cannot allocate buffer sizes\n");
358 av_free(s
->buf_start
);
359 return AVERROR(ENOMEM
);
362 for (i
= 0; i
< req
.count
; i
++) {
363 struct v4l2_buffer buf
= {
364 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
366 .memory
= V4L2_MEMORY_MMAP
368 if (v4l2_ioctl(s
->fd
, VIDIOC_QUERYBUF
, &buf
) < 0) {
369 res
= AVERROR(errno
);
370 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res
));
374 s
->buf_len
[i
] = buf
.length
;
375 if (s
->frame_size
> 0 && s
->buf_len
[i
] < s
->frame_size
) {
376 av_log(ctx
, AV_LOG_ERROR
,
377 "buf_len[%d] = %d < expected frame size %d\n",
378 i
, s
->buf_len
[i
], s
->frame_size
);
379 return AVERROR(ENOMEM
);
381 s
->buf_start
[i
] = v4l2_mmap(NULL
, buf
.length
,
382 PROT_READ
| PROT_WRITE
, MAP_SHARED
,
383 s
->fd
, buf
.m
.offset
);
385 if (s
->buf_start
[i
] == MAP_FAILED
) {
386 res
= AVERROR(errno
);
387 av_log(ctx
, AV_LOG_ERROR
, "mmap: %s\n", av_err2str(res
));
395 #if FF_API_DESTRUCT_PACKET
396 static void dummy_release_buffer(AVPacket
*pkt
)
402 static int enqueue_buffer(struct video_data
*s
, struct v4l2_buffer
*buf
)
406 if (v4l2_ioctl(s
->fd
, VIDIOC_QBUF
, buf
) < 0) {
407 res
= AVERROR(errno
);
408 av_log(NULL
, AV_LOG_ERROR
, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res
));
410 avpriv_atomic_int_add_and_fetch(&s
->buffers_queued
, 1);
416 static void mmap_release_buffer(void *opaque
, uint8_t *data
)
418 struct v4l2_buffer buf
= { 0 };
419 struct buff_data
*buf_descriptor
= opaque
;
420 struct video_data
*s
= buf_descriptor
->s
;
422 buf
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
423 buf
.memory
= V4L2_MEMORY_MMAP
;
424 buf
.index
= buf_descriptor
->index
;
425 av_free(buf_descriptor
);
427 enqueue_buffer(s
, &buf
);
430 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
431 static int64_t av_gettime_monotonic(void)
433 return av_gettime_relative();
437 static int init_convert_timestamp(AVFormatContext
*ctx
, int64_t ts
)
439 struct video_data
*s
= ctx
->priv_data
;
443 if (s
->ts_mode
== V4L_TS_ABS
&&
444 ts
<= now
+ 1 * AV_TIME_BASE
&& ts
>= now
- 10 * AV_TIME_BASE
) {
445 av_log(ctx
, AV_LOG_INFO
, "Detected absolute timestamps\n");
446 s
->ts_mode
= V4L_TS_CONVERT_READY
;
449 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
450 if (ctx
->streams
[0]->avg_frame_rate
.num
) {
451 now
= av_gettime_monotonic();
452 if (s
->ts_mode
== V4L_TS_MONO2ABS
||
453 (ts
<= now
+ 1 * AV_TIME_BASE
&& ts
>= now
- 10 * AV_TIME_BASE
)) {
454 AVRational tb
= {AV_TIME_BASE
, 1};
455 int64_t period
= av_rescale_q(1, tb
, ctx
->streams
[0]->avg_frame_rate
);
456 av_log(ctx
, AV_LOG_INFO
, "Detected monotonic timestamps, converting\n");
457 /* microseconds instead of seconds, MHz instead of Hz */
458 s
->timefilter
= ff_timefilter_new(1, period
, 1.0E-6);
460 return AVERROR(ENOMEM
);
461 s
->ts_mode
= V4L_TS_CONVERT_READY
;
466 av_log(ctx
, AV_LOG_ERROR
, "Unknown timestamps\n");
470 static int convert_timestamp(AVFormatContext
*ctx
, int64_t *ts
)
472 struct video_data
*s
= ctx
->priv_data
;
475 int r
= init_convert_timestamp(ctx
, *ts
);
479 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
481 int64_t nowa
= av_gettime();
482 int64_t nowm
= av_gettime_monotonic();
483 ff_timefilter_update(s
->timefilter
, nowa
, nowm
- s
->last_time_m
);
484 s
->last_time_m
= nowm
;
485 *ts
= ff_timefilter_eval(s
->timefilter
, *ts
- nowm
);
491 static int mmap_read_frame(AVFormatContext
*ctx
, AVPacket
*pkt
)
493 struct video_data
*s
= ctx
->priv_data
;
494 struct v4l2_buffer buf
= {
495 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
496 .memory
= V4L2_MEMORY_MMAP
500 /* FIXME: Some special treatment might be needed in case of loss of signal... */
501 while ((res
= v4l2_ioctl(s
->fd
, VIDIOC_DQBUF
, &buf
)) < 0 && (errno
== EINTR
));
503 if (errno
== EAGAIN
) {
505 return AVERROR(EAGAIN
);
507 res
= AVERROR(errno
);
508 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res
));
512 if (buf
.index
>= s
->buffers
) {
513 av_log(ctx
, AV_LOG_ERROR
, "Invalid buffer index received.\n");
514 return AVERROR(EINVAL
);
516 avpriv_atomic_int_add_and_fetch(&s
->buffers_queued
, -1);
517 // always keep at least one buffer queued
518 av_assert0(avpriv_atomic_int_get(&s
->buffers_queued
) >= 1);
520 /* CPIA is a compressed format and we don't know the exact number of bytes
521 * used by a frame, so set it here as the driver announces it.
523 if (ctx
->video_codec_id
== AV_CODEC_ID_CPIA
)
524 s
->frame_size
= buf
.bytesused
;
526 if (s
->frame_size
> 0 && buf
.bytesused
!= s
->frame_size
) {
527 av_log(ctx
, AV_LOG_ERROR
,
528 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
529 buf
.bytesused
, s
->frame_size
);
530 enqueue_buffer(s
, &buf
);
531 return AVERROR_INVALIDDATA
;
534 /* Image is at s->buff_start[buf.index] */
535 if (avpriv_atomic_int_get(&s
->buffers_queued
) == FFMAX(s
->buffers
/ 8, 1)) {
536 /* when we start getting low on queued buffers, fall back on copying data */
537 res
= av_new_packet(pkt
, buf
.bytesused
);
539 av_log(ctx
, AV_LOG_ERROR
, "Error allocating a packet.\n");
540 enqueue_buffer(s
, &buf
);
543 memcpy(pkt
->data
, s
->buf_start
[buf
.index
], buf
.bytesused
);
545 res
= enqueue_buffer(s
, &buf
);
551 struct buff_data
*buf_descriptor
;
553 pkt
->data
= s
->buf_start
[buf
.index
];
554 pkt
->size
= buf
.bytesused
;
555 #if FF_API_DESTRUCT_PACKET
556 FF_DISABLE_DEPRECATION_WARNINGS
557 pkt
->destruct
= dummy_release_buffer
;
558 FF_ENABLE_DEPRECATION_WARNINGS
561 buf_descriptor
= av_malloc(sizeof(struct buff_data
));
562 if (!buf_descriptor
) {
563 /* Something went wrong... Since av_malloc() failed, we cannot even
564 * allocate a buffer for memcpying into it
566 av_log(ctx
, AV_LOG_ERROR
, "Failed to allocate a buffer descriptor\n");
567 enqueue_buffer(s
, &buf
);
569 return AVERROR(ENOMEM
);
571 buf_descriptor
->index
= buf
.index
;
572 buf_descriptor
->s
= s
;
574 pkt
->buf
= av_buffer_create(pkt
->data
, pkt
->size
, mmap_release_buffer
,
577 av_log(ctx
, AV_LOG_ERROR
, "Failed to create a buffer\n");
578 enqueue_buffer(s
, &buf
);
579 av_freep(&buf_descriptor
);
580 return AVERROR(ENOMEM
);
583 pkt
->pts
= buf
.timestamp
.tv_sec
* INT64_C(1000000) + buf
.timestamp
.tv_usec
;
584 convert_timestamp(ctx
, &pkt
->pts
);
586 return s
->buf_len
[buf
.index
];
589 static int mmap_start(AVFormatContext
*ctx
)
591 struct video_data
*s
= ctx
->priv_data
;
592 enum v4l2_buf_type type
;
595 for (i
= 0; i
< s
->buffers
; i
++) {
596 struct v4l2_buffer buf
= {
597 .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
,
599 .memory
= V4L2_MEMORY_MMAP
602 if (v4l2_ioctl(s
->fd
, VIDIOC_QBUF
, &buf
) < 0) {
603 res
= AVERROR(errno
);
604 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res
));
608 s
->buffers_queued
= s
->buffers
;
610 type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
611 if (v4l2_ioctl(s
->fd
, VIDIOC_STREAMON
, &type
) < 0) {
612 res
= AVERROR(errno
);
613 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res
));
620 static void mmap_close(struct video_data
*s
)
622 enum v4l2_buf_type type
;
625 type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
626 /* We do not check for the result, because we could
627 * not do anything about it anyway...
629 v4l2_ioctl(s
->fd
, VIDIOC_STREAMOFF
, &type
);
630 for (i
= 0; i
< s
->buffers
; i
++) {
631 v4l2_munmap(s
->buf_start
[i
], s
->buf_len
[i
]);
633 av_free(s
->buf_start
);
637 static int v4l2_set_parameters(AVFormatContext
*ctx
)
639 struct video_data
*s
= ctx
->priv_data
;
640 struct v4l2_standard standard
= { 0 };
641 struct v4l2_streamparm streamparm
= { 0 };
642 struct v4l2_fract
*tpf
;
643 AVRational framerate_q
= { 0 };
647 (ret
= av_parse_video_rate(&framerate_q
, s
->framerate
)) < 0) {
648 av_log(ctx
, AV_LOG_ERROR
, "Could not parse framerate '%s'.\n",
656 av_log(ctx
, AV_LOG_DEBUG
, "Setting standard: %s\n", s
->standard
);
657 /* set tv standard */
660 if (v4l2_ioctl(s
->fd
, VIDIOC_ENUMSTD
, &standard
) < 0) {
661 ret
= AVERROR(errno
);
664 if (!av_strcasecmp(standard
.name
, s
->standard
))
668 av_log(ctx
, AV_LOG_ERROR
, "Unknown or unsupported standard '%s'\n", s
->standard
);
672 if (v4l2_ioctl(s
->fd
, VIDIOC_S_STD
, &standard
.id
) < 0) {
673 ret
= AVERROR(errno
);
674 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret
));
678 av_log(ctx
, AV_LOG_WARNING
,
679 "This device does not support any standard\n");
684 if (v4l2_ioctl(s
->fd
, VIDIOC_G_STD
, &s
->std_id
) == 0) {
685 tpf
= &standard
.frameperiod
;
688 if (v4l2_ioctl(s
->fd
, VIDIOC_ENUMSTD
, &standard
) < 0) {
689 ret
= AVERROR(errno
);
690 if (ret
== AVERROR(EINVAL
)
692 || ret
== AVERROR(ENODATA
)
695 tpf
= &streamparm
.parm
.capture
.timeperframe
;
698 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret
));
701 if (standard
.id
== s
->std_id
) {
702 av_log(ctx
, AV_LOG_DEBUG
,
703 "Current standard: %s, id: %"PRIx64
", frameperiod: %d/%d\n",
704 standard
.name
, (uint64_t)standard
.id
, tpf
->numerator
, tpf
->denominator
);
709 tpf
= &streamparm
.parm
.capture
.timeperframe
;
712 streamparm
.type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
;
713 if (v4l2_ioctl(s
->fd
, VIDIOC_G_PARM
, &streamparm
) < 0) {
714 ret
= AVERROR(errno
);
715 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret
));
719 if (framerate_q
.num
&& framerate_q
.den
) {
720 if (streamparm
.parm
.capture
.capability
& V4L2_CAP_TIMEPERFRAME
) {
721 tpf
= &streamparm
.parm
.capture
.timeperframe
;
723 av_log(ctx
, AV_LOG_DEBUG
, "Setting time per frame to %d/%d\n",
724 framerate_q
.den
, framerate_q
.num
);
725 tpf
->numerator
= framerate_q
.den
;
726 tpf
->denominator
= framerate_q
.num
;
728 if (v4l2_ioctl(s
->fd
, VIDIOC_S_PARM
, &streamparm
) < 0) {
729 ret
= AVERROR(errno
);
730 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret
));
734 if (framerate_q
.num
!= tpf
->denominator
||
735 framerate_q
.den
!= tpf
->numerator
) {
736 av_log(ctx
, AV_LOG_INFO
,
737 "The driver changed the time per frame from "
739 framerate_q
.den
, framerate_q
.num
,
740 tpf
->numerator
, tpf
->denominator
);
743 av_log(ctx
, AV_LOG_WARNING
,
744 "The driver does not allow to change time per frame\n");
747 if (tpf
->denominator
> 0 && tpf
->numerator
> 0) {
748 ctx
->streams
[0]->avg_frame_rate
.num
= tpf
->denominator
;
749 ctx
->streams
[0]->avg_frame_rate
.den
= tpf
->numerator
;
750 ctx
->streams
[0]->r_frame_rate
= ctx
->streams
[0]->avg_frame_rate
;
752 av_log(ctx
, AV_LOG_WARNING
, "Time per frame unknown\n");
757 static int device_try_init(AVFormatContext
*ctx
,
758 enum AVPixelFormat pix_fmt
,
761 uint32_t *desired_format
,
762 enum AVCodecID
*codec_id
)
766 *desired_format
= avpriv_fmt_ff2v4l(pix_fmt
, ctx
->video_codec_id
);
768 if (*desired_format
) {
769 ret
= device_init(ctx
, width
, height
, *desired_format
);
772 if (ret
!= AVERROR(EINVAL
))
777 if (!*desired_format
) {
778 for (i
= 0; avpriv_fmt_conversion_table
[i
].codec_id
!= AV_CODEC_ID_NONE
; i
++) {
779 if (ctx
->video_codec_id
== AV_CODEC_ID_NONE
||
780 avpriv_fmt_conversion_table
[i
].codec_id
== ctx
->video_codec_id
) {
781 av_log(ctx
, AV_LOG_DEBUG
, "Trying to set codec:%s pix_fmt:%s\n",
782 avcodec_get_name(avpriv_fmt_conversion_table
[i
].codec_id
),
783 (char *)av_x_if_null(av_get_pix_fmt_name(avpriv_fmt_conversion_table
[i
].ff_fmt
), "none"));
785 *desired_format
= avpriv_fmt_conversion_table
[i
].v4l2_fmt
;
786 ret
= device_init(ctx
, width
, height
, *desired_format
);
789 else if (ret
!= AVERROR(EINVAL
))
795 if (*desired_format
== 0) {
796 av_log(ctx
, AV_LOG_ERROR
, "Cannot find a proper format for "
797 "codec '%s' (id %d), pixel format '%s' (id %d)\n",
798 avcodec_get_name(ctx
->video_codec_id
), ctx
->video_codec_id
,
799 (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt
), "none"), pix_fmt
);
800 ret
= AVERROR(EINVAL
);
804 *codec_id
= avpriv_fmt_v4l2codec(*desired_format
);
805 av_assert0(*codec_id
!= AV_CODEC_ID_NONE
);
809 static int v4l2_read_header(AVFormatContext
*ctx
)
811 struct video_data
*s
= ctx
->priv_data
;
814 uint32_t desired_format
;
815 enum AVCodecID codec_id
= AV_CODEC_ID_NONE
;
816 enum AVPixelFormat pix_fmt
= AV_PIX_FMT_NONE
;
817 struct v4l2_input input
= { 0 };
819 st
= avformat_new_stream(ctx
, NULL
);
821 return AVERROR(ENOMEM
);
824 /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL
825 and errors will get sent to stderr */
827 v4l2_log_file
= fopen("/dev/null", "w");
830 s
->fd
= device_open(ctx
);
834 if (s
->channel
!= -1) {
835 /* set video input */
836 av_log(ctx
, AV_LOG_DEBUG
, "Selecting input_channel: %d\n", s
->channel
);
837 if (v4l2_ioctl(s
->fd
, VIDIOC_S_INPUT
, &s
->channel
) < 0) {
838 res
= AVERROR(errno
);
839 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res
));
843 /* get current video input */
844 if (v4l2_ioctl(s
->fd
, VIDIOC_G_INPUT
, &s
->channel
) < 0) {
845 res
= AVERROR(errno
);
846 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res
));
852 input
.index
= s
->channel
;
853 if (v4l2_ioctl(s
->fd
, VIDIOC_ENUMINPUT
, &input
) < 0) {
854 res
= AVERROR(errno
);
855 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res
));
858 s
->std_id
= input
.std
;
859 av_log(ctx
, AV_LOG_DEBUG
, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64
"\n",
860 s
->channel
, input
.name
, (uint64_t)input
.std
);
862 if (s
->list_format
) {
863 list_formats(ctx
, s
->list_format
);
868 if (s
->list_standard
) {
874 avpriv_set_pts_info(st
, 64, 1, 1000000); /* 64 bits pts in us */
876 if ((res
= v4l2_set_parameters(ctx
)) < 0)
879 if (s
->pixel_format
) {
880 AVCodec
*codec
= avcodec_find_decoder_by_name(s
->pixel_format
);
883 ctx
->video_codec_id
= codec
->id
;
885 pix_fmt
= av_get_pix_fmt(s
->pixel_format
);
887 if (pix_fmt
== AV_PIX_FMT_NONE
&& !codec
) {
888 av_log(ctx
, AV_LOG_ERROR
, "No such input format: %s.\n",
891 res
= AVERROR(EINVAL
);
896 if (!s
->width
&& !s
->height
) {
897 struct v4l2_format fmt
= { .type
= V4L2_BUF_TYPE_VIDEO_CAPTURE
};
899 av_log(ctx
, AV_LOG_VERBOSE
,
900 "Querying the device for the current frame size\n");
901 if (v4l2_ioctl(s
->fd
, VIDIOC_G_FMT
, &fmt
) < 0) {
902 res
= AVERROR(errno
);
903 av_log(ctx
, AV_LOG_ERROR
, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res
));
907 s
->width
= fmt
.fmt
.pix
.width
;
908 s
->height
= fmt
.fmt
.pix
.height
;
909 av_log(ctx
, AV_LOG_VERBOSE
,
910 "Setting frame size to %dx%d\n", s
->width
, s
->height
);
913 res
= device_try_init(ctx
, pix_fmt
, &s
->width
, &s
->height
, &desired_format
, &codec_id
);
917 /* If no pixel_format was specified, the codec_id was not known up
918 * until now. Set video_codec_id in the context, as codec_id will
919 * not be available outside this function
921 if (codec_id
!= AV_CODEC_ID_NONE
&& ctx
->video_codec_id
== AV_CODEC_ID_NONE
)
922 ctx
->video_codec_id
= codec_id
;
924 if ((res
= av_image_check_size(s
->width
, s
->height
, 0, ctx
)) < 0)
927 s
->frame_format
= desired_format
;
929 st
->codec
->pix_fmt
= avpriv_fmt_v4l2ff(desired_format
, codec_id
);
931 avpicture_get_size(st
->codec
->pix_fmt
, s
->width
, s
->height
);
933 if ((res
= mmap_init(ctx
)) ||
934 (res
= mmap_start(ctx
)) < 0)
937 s
->top_field_first
= first_field(s
);
939 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
940 st
->codec
->codec_id
= codec_id
;
941 if (codec_id
== AV_CODEC_ID_RAWVIDEO
)
942 st
->codec
->codec_tag
=
943 avcodec_pix_fmt_to_codec_tag(st
->codec
->pix_fmt
);
944 else if (codec_id
== AV_CODEC_ID_H264
) {
945 st
->need_parsing
= AVSTREAM_PARSE_HEADERS
;
947 if (desired_format
== V4L2_PIX_FMT_YVU420
)
948 st
->codec
->codec_tag
= MKTAG('Y', 'V', '1', '2');
949 else if (desired_format
== V4L2_PIX_FMT_YVU410
)
950 st
->codec
->codec_tag
= MKTAG('Y', 'V', 'U', '9');
951 st
->codec
->width
= s
->width
;
952 st
->codec
->height
= s
->height
;
953 if (st
->avg_frame_rate
.den
)
954 st
->codec
->bit_rate
= s
->frame_size
* av_q2d(st
->avg_frame_rate
) * 8;
963 static int v4l2_read_packet(AVFormatContext
*ctx
, AVPacket
*pkt
)
965 struct video_data
*s
= ctx
->priv_data
;
966 AVFrame
*frame
= ctx
->streams
[0]->codec
->coded_frame
;
970 if ((res
= mmap_read_frame(ctx
, pkt
)) < 0) {
974 if (frame
&& s
->interlaced
) {
975 frame
->interlaced_frame
= 1;
976 frame
->top_field_first
= s
->top_field_first
;
982 static int v4l2_read_close(AVFormatContext
*ctx
)
984 struct video_data
*s
= ctx
->priv_data
;
986 if (avpriv_atomic_int_get(&s
->buffers_queued
) != s
->buffers
)
987 av_log(ctx
, AV_LOG_WARNING
, "Some buffers are still owned by the caller on "
996 #define OFFSET(x) offsetof(struct video_data, x)
997 #define DEC AV_OPT_FLAG_DECODING_PARAM
999 static const AVOption options
[] = {
1000 { "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard
), AV_OPT_TYPE_STRING
, {.str
= NULL
}, 0, 0, DEC
},
1001 { "channel", "set TV channel, used only by frame grabber", OFFSET(channel
), AV_OPT_TYPE_INT
, {.i64
= -1 }, -1, INT_MAX
, DEC
},
1002 { "video_size", "set frame size", OFFSET(width
), AV_OPT_TYPE_IMAGE_SIZE
, {.str
= NULL
}, 0, 0, DEC
},
1003 { "pixel_format", "set preferred pixel format", OFFSET(pixel_format
), AV_OPT_TYPE_STRING
, {.str
= NULL
}, 0, 0, DEC
},
1004 { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format
), AV_OPT_TYPE_STRING
, {.str
= NULL
}, 0, 0, DEC
},
1005 { "framerate", "set frame rate", OFFSET(framerate
), AV_OPT_TYPE_STRING
, {.str
= NULL
}, 0, 0, DEC
},
1007 { "list_formats", "list available formats and exit", OFFSET(list_format
), AV_OPT_TYPE_INT
, {.i64
= 0 }, 0, INT_MAX
, DEC
, "list_formats" },
1008 { "all", "show all available formats", OFFSET(list_format
), AV_OPT_TYPE_CONST
, {.i64
= V4L_ALLFORMATS
}, 0, INT_MAX
, DEC
, "list_formats" },
1009 { "raw", "show only non-compressed formats", OFFSET(list_format
), AV_OPT_TYPE_CONST
, {.i64
= V4L_RAWFORMATS
}, 0, INT_MAX
, DEC
, "list_formats" },
1010 { "compressed", "show only compressed formats", OFFSET(list_format
), AV_OPT_TYPE_CONST
, {.i64
= V4L_COMPFORMATS
}, 0, INT_MAX
, DEC
, "list_formats" },
1012 { "list_standards", "list supported standards and exit", OFFSET(list_standard
), AV_OPT_TYPE_INT
, {.i64
= 0 }, 0, 1, DEC
, "list_standards" },
1013 { "all", "show all supported standards", OFFSET(list_standard
), AV_OPT_TYPE_CONST
, {.i64
= 1 }, 0, 0, DEC
, "list_standards" },
1015 { "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode
), AV_OPT_TYPE_INT
, {.i64
= 0 }, 0, 2, DEC
, "timestamps" },
1016 { "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode
), AV_OPT_TYPE_INT
, {.i64
= 0 }, 0, 2, DEC
, "timestamps" },
1017 { "default", "use timestamps from the kernel", OFFSET(ts_mode
), AV_OPT_TYPE_CONST
, {.i64
= V4L_TS_DEFAULT
}, 0, 2, DEC
, "timestamps" },
1018 { "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode
), AV_OPT_TYPE_CONST
, {.i64
= V4L_TS_ABS
}, 0, 2, DEC
, "timestamps" },
1019 { "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode
), AV_OPT_TYPE_CONST
, {.i64
= V4L_TS_MONO2ABS
}, 0, 2, DEC
, "timestamps" },
1020 { "use_libv4l2", "use libv4l2 (v4l-utils) conversion functions", OFFSET(use_libv4l2
), AV_OPT_TYPE_INT
, {.i64
= 0}, 0, 1, DEC
},
1024 static const AVClass v4l2_class
= {
1025 .class_name
= "V4L2 indev",
1026 .item_name
= av_default_item_name
,
1028 .version
= LIBAVUTIL_VERSION_INT
,
1029 .category
= AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
,
1032 AVInputFormat ff_v4l2_demuxer
= {
1033 .name
= "video4linux2,v4l2",
1034 .long_name
= NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
1035 .priv_data_size
= sizeof(struct video_data
),
1036 .read_header
= v4l2_read_header
,
1037 .read_packet
= v4l2_read_packet
,
1038 .read_close
= v4l2_read_close
,
1039 .flags
= AVFMT_NOFILE
,
1040 .priv_class
= &v4l2_class
,