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://v4l2spec.bytesex.org/v4l2spec/capture.c)
29 * Thanks to Michael Niedermayer for providing the mapping between
30 * V4L2_PIX_FMT_* and PIX_FMT_*
33 #undef __STRICT_ANSI__ //workaround due to broken kernel headers
35 #include "libavformat/internal.h"
38 #include <sys/ioctl.h>
41 #if HAVE_SYS_VIDEOIO_H
42 #include <sys/videoio.h>
45 #include <asm/types.h>
47 #include <linux/videodev2.h>
50 #include "libavutil/imgutils.h"
51 #include "libavutil/log.h"
52 #include "libavutil/opt.h"
54 #include "libavutil/parseutils.h"
55 #include "libavutil/pixdesc.h"
56 #include "libavutil/avstring.h"
61 #define v4l2_open open
62 #define v4l2_close close
64 #define v4l2_ioctl ioctl
65 #define v4l2_read read
66 #define v4l2_mmap mmap
67 #define v4l2_munmap munmap
70 static const int desired_video_buffers = 256;
72 #define V4L_ALLFORMATS 3
73 #define V4L_RAWFORMATS 1
74 #define V4L_COMPFORMATS 2
79 int frame_format; /* V4L2_PIX_FMT_* */
87 unsigned int *buf_len;
90 char *video_size; /**< String describing video size,
91 set by a private option. */
92 char *pixel_format; /**< Set by a private option. */
93 int list_format; /**< Set by a private option. */
94 char *framerate; /**< Set by a private option. */
103 enum PixelFormat ff_fmt;
104 enum CodecID codec_id;
108 static struct fmt_map fmt_conversion_table[] = {
109 //ff_fmt codec_id v4l2_fmt
110 { PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
111 { PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420 },
112 { PIX_FMT_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
113 { PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
114 { PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
115 { PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
116 { PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
117 { PIX_FMT_RGB555LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
118 { PIX_FMT_RGB555BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X },
119 { PIX_FMT_RGB565LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
120 { PIX_FMT_RGB565BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X },
121 { PIX_FMT_BGR24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
122 { PIX_FMT_RGB24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
123 { PIX_FMT_BGR0, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
124 { PIX_FMT_0RGB, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 },
125 { PIX_FMT_GRAY8, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
126 { PIX_FMT_NV12, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
127 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
128 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
131 static int device_open(AVFormatContext *ctx)
133 struct v4l2_capability cap;
141 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
145 fd = v4l2_open(ctx->filename, flags, 0);
149 av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
150 ctx->filename, strerror(err));
155 fd_libv4l = v4l2_fd_open(fd, 0);
157 err = AVERROR(errno);
158 av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n",
159 ctx->filename, strerror(errno));
165 res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap);
168 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
174 av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
175 fd, cap.capabilities);
177 if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
178 av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
184 if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
185 av_log(ctx, AV_LOG_ERROR,
186 "The device does not support the streaming I/O method.\n");
199 static int device_init(AVFormatContext *ctx, int *width, int *height,
202 struct video_data *s = ctx->priv_data;
204 struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
205 struct v4l2_pix_format *pix = &fmt.fmt.pix;
210 pix->height = *height;
211 pix->pixelformat = pix_fmt;
212 pix->field = V4L2_FIELD_ANY;
214 res = v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt);
216 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
217 av_log(ctx, AV_LOG_INFO,
218 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
219 *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
220 *width = fmt.fmt.pix.width;
221 *height = fmt.fmt.pix.height;
224 if (pix_fmt != fmt.fmt.pix.pixelformat) {
225 av_log(ctx, AV_LOG_DEBUG,
226 "The V4L2 driver changed the pixel format "
227 "from 0x%08X to 0x%08X\n",
228 pix_fmt, fmt.fmt.pix.pixelformat);
232 if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
233 av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
240 static int first_field(int fd)
245 res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
249 if (std & V4L2_STD_NTSC) {
256 static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
260 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
261 if ((codec_id == CODEC_ID_NONE ||
262 fmt_conversion_table[i].codec_id == codec_id) &&
263 (pix_fmt == PIX_FMT_NONE ||
264 fmt_conversion_table[i].ff_fmt == pix_fmt)) {
265 return fmt_conversion_table[i].v4l2_fmt;
272 static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
276 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
277 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
278 fmt_conversion_table[i].codec_id == codec_id) {
279 return fmt_conversion_table[i].ff_fmt;
286 static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
290 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
291 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
292 return fmt_conversion_table[i].codec_id;
296 return CODEC_ID_NONE;
299 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
300 static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
302 struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
304 while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
306 case V4L2_FRMSIZE_TYPE_DISCRETE:
307 av_log(ctx, AV_LOG_INFO, " %ux%u",
308 vfse.discrete.width, vfse.discrete.height);
310 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
311 case V4L2_FRMSIZE_TYPE_STEPWISE:
312 av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
313 vfse.stepwise.min_width,
314 vfse.stepwise.max_width,
315 vfse.stepwise.step_width,
316 vfse.stepwise.min_height,
317 vfse.stepwise.max_height,
318 vfse.stepwise.step_height);
325 static void list_formats(AVFormatContext *ctx, int fd, int type)
327 struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
329 while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
330 enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
331 enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
335 if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
336 type & V4L_RAWFORMATS) {
337 const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
338 av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
339 fmt_name ? fmt_name : "Unsupported",
341 } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
342 type & V4L_COMPFORMATS) {
343 AVCodec *codec = avcodec_find_encoder(codec_id);
344 av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
345 codec ? codec->name : "Unsupported",
351 #ifdef V4L2_FMT_FLAG_EMULATED
352 if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
353 av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
357 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
358 list_framesizes(ctx, fd, vfd.pixelformat);
360 av_log(ctx, AV_LOG_INFO, "\n");
364 static int mmap_init(AVFormatContext *ctx)
367 struct video_data *s = ctx->priv_data;
368 struct v4l2_requestbuffers req = {
369 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
370 .count = desired_video_buffers,
371 .memory = V4L2_MEMORY_MMAP
374 res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req);
376 if (errno == EINVAL) {
377 av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
379 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
381 return AVERROR(errno);
385 av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
386 return AVERROR(ENOMEM);
388 s->buffers = req.count;
389 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
390 if (s->buf_start == NULL) {
391 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
392 return AVERROR(ENOMEM);
394 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
395 if (s->buf_len == NULL) {
396 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
397 av_free(s->buf_start);
398 return AVERROR(ENOMEM);
401 for (i = 0; i < req.count; i++) {
402 struct v4l2_buffer buf = {
403 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
405 .memory = V4L2_MEMORY_MMAP
407 res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
409 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
410 return AVERROR(errno);
413 s->buf_len[i] = buf.length;
414 if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
415 av_log(ctx, AV_LOG_ERROR,
416 "Buffer len [%d] = %d != %d\n",
417 i, s->buf_len[i], s->frame_size);
421 s->buf_start[i] = v4l2_mmap(NULL, buf.length,
422 PROT_READ | PROT_WRITE, MAP_SHARED,
423 s->fd, buf.m.offset);
425 if (s->buf_start[i] == MAP_FAILED) {
426 av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
427 return AVERROR(errno);
434 static void mmap_release_buffer(AVPacket *pkt)
436 struct v4l2_buffer buf = { 0 };
438 struct buff_data *buf_descriptor = pkt->priv;
440 if (pkt->data == NULL)
443 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
444 buf.memory = V4L2_MEMORY_MMAP;
445 buf.index = buf_descriptor->index;
446 fd = buf_descriptor->fd;
447 av_free(buf_descriptor);
449 res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf);
451 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
458 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
460 struct video_data *s = ctx->priv_data;
461 struct v4l2_buffer buf = {
462 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
463 .memory = V4L2_MEMORY_MMAP
465 struct buff_data *buf_descriptor;
468 /* FIXME: Some special treatment might be needed in case of loss of signal... */
469 while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
471 if (errno == EAGAIN) {
473 return AVERROR(EAGAIN);
475 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
478 return AVERROR(errno);
480 assert(buf.index < s->buffers);
481 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
482 av_log(ctx, AV_LOG_ERROR,
483 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
484 buf.bytesused, s->frame_size);
486 return AVERROR_INVALIDDATA;
489 /* Image is at s->buff_start[buf.index] */
490 pkt->data= s->buf_start[buf.index];
491 pkt->size = buf.bytesused;
492 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
493 pkt->destruct = mmap_release_buffer;
494 buf_descriptor = av_malloc(sizeof(struct buff_data));
495 if (buf_descriptor == NULL) {
496 /* Something went wrong... Since av_malloc() failed, we cannot even
497 * allocate a buffer for memcopying into it
499 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
500 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
502 return AVERROR(ENOMEM);
504 buf_descriptor->fd = s->fd;
505 buf_descriptor->index = buf.index;
506 pkt->priv = buf_descriptor;
508 return s->buf_len[buf.index];
511 static int mmap_start(AVFormatContext *ctx)
513 struct video_data *s = ctx->priv_data;
514 enum v4l2_buf_type type;
517 for (i = 0; i < s->buffers; i++) {
518 struct v4l2_buffer buf = {
519 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
521 .memory = V4L2_MEMORY_MMAP
524 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
526 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
529 return AVERROR(errno);
533 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
534 res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type);
536 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
539 return AVERROR(errno);
545 static void mmap_close(struct video_data *s)
547 enum v4l2_buf_type type;
550 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
551 /* We do not check for the result, because we could
552 * not do anything about it anyway...
554 v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
555 for (i = 0; i < s->buffers; i++) {
556 v4l2_munmap(s->buf_start[i], s->buf_len[i]);
558 av_free(s->buf_start);
562 static int v4l2_set_parameters(AVFormatContext *s1)
564 struct video_data *s = s1->priv_data;
565 struct v4l2_input input = { 0 };
566 struct v4l2_standard standard = { 0 };
567 struct v4l2_streamparm streamparm = { 0 };
568 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
569 AVRational framerate_q = { 0 };
572 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
575 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
576 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
581 /* set tv video input */
582 input.index = s->channel;
583 if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
584 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
588 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
589 s->channel, input.name);
590 if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
591 av_log(s1, AV_LOG_ERROR,
592 "The V4L2 driver ioctl set input(%d) failed\n",
598 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
600 /* set tv standard */
603 ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
604 if (ret < 0 || !av_strcasecmp(standard.name, s->standard))
608 av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard);
612 av_log(s1, AV_LOG_DEBUG,
613 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
614 s->standard, (uint64_t)standard.id);
615 if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
616 av_log(s1, AV_LOG_ERROR,
617 "The V4L2 driver ioctl set standard(%s) failed\n",
623 if (framerate_q.num && framerate_q.den) {
624 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
625 framerate_q.den, framerate_q.num);
626 tpf->numerator = framerate_q.den;
627 tpf->denominator = framerate_q.num;
629 if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
630 av_log(s1, AV_LOG_ERROR,
631 "ioctl set time per frame(%d/%d) failed\n",
632 framerate_q.den, framerate_q.num);
636 if (framerate_q.num != tpf->denominator ||
637 framerate_q.den != tpf->numerator) {
638 av_log(s1, AV_LOG_INFO,
639 "The driver changed the time per frame from "
641 framerate_q.den, framerate_q.num,
642 tpf->numerator, tpf->denominator);
645 if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
646 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
648 return AVERROR(errno);
651 s1->streams[0]->codec->time_base.den = tpf->denominator;
652 s1->streams[0]->codec->time_base.num = tpf->numerator;
657 static uint32_t device_try_init(AVFormatContext *s1,
658 enum PixelFormat pix_fmt,
661 enum CodecID *codec_id)
663 uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
665 if (desired_format == 0 ||
666 device_init(s1, width, height, desired_format) < 0) {
670 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
671 if (s1->video_codec_id == CODEC_ID_NONE ||
672 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
673 desired_format = fmt_conversion_table[i].v4l2_fmt;
674 if (device_init(s1, width, height, desired_format) >= 0) {
682 if (desired_format != 0) {
683 *codec_id = fmt_v4l2codec(desired_format);
684 assert(*codec_id != CODEC_ID_NONE);
687 return desired_format;
690 static int v4l2_read_header(AVFormatContext *s1)
692 struct video_data *s = s1->priv_data;
695 uint32_t desired_format;
696 enum CodecID codec_id;
697 enum PixelFormat pix_fmt = PIX_FMT_NONE;
699 st = avformat_new_stream(s1, NULL);
701 res = AVERROR(ENOMEM);
705 s->fd = device_open(s1);
711 if (s->list_format) {
712 list_formats(s1, s->fd, s->list_format);
717 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
720 (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
721 av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
726 if (s->pixel_format) {
727 AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
730 s1->video_codec_id = codec->id;
732 pix_fmt = av_get_pix_fmt(s->pixel_format);
734 if (pix_fmt == PIX_FMT_NONE && !codec) {
735 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
738 res = AVERROR(EINVAL);
743 if (!s->width && !s->height) {
744 struct v4l2_format fmt;
746 av_log(s1, AV_LOG_VERBOSE,
747 "Querying the device for the current frame size\n");
748 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
749 if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
750 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
752 res = AVERROR(errno);
756 s->width = fmt.fmt.pix.width;
757 s->height = fmt.fmt.pix.height;
758 av_log(s1, AV_LOG_VERBOSE,
759 "Setting frame size to %dx%d\n", s->width, s->height);
762 desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
764 if (desired_format == 0) {
765 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
766 "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
772 if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
775 s->frame_format = desired_format;
777 if ((res = v4l2_set_parameters(s1)) < 0)
780 st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
782 avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
784 if ((res = mmap_init(s1)) ||
785 (res = mmap_start(s1)) < 0) {
790 s->top_field_first = first_field(s->fd);
792 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
793 st->codec->codec_id = codec_id;
794 if (codec_id == CODEC_ID_RAWVIDEO)
795 st->codec->codec_tag =
796 avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
797 if (desired_format == V4L2_PIX_FMT_YVU420)
798 st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
799 st->codec->width = s->width;
800 st->codec->height = s->height;
801 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
807 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
809 struct video_data *s = s1->priv_data;
810 AVFrame *frame = s1->streams[0]->codec->coded_frame;
814 if ((res = mmap_read_frame(s1, pkt)) < 0) {
818 if (frame && s->interlaced) {
819 frame->interlaced_frame = 1;
820 frame->top_field_first = s->top_field_first;
826 static int v4l2_read_close(AVFormatContext *s1)
828 struct video_data *s = s1->priv_data;
836 #define OFFSET(x) offsetof(struct video_data, x)
837 #define DEC AV_OPT_FLAG_DECODING_PARAM
839 static const AVOption options[] = {
840 { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
841 { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC },
842 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
843 { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
844 { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
845 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
846 { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
847 { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
848 { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
849 { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
853 static const AVClass v4l2_class = {
854 .class_name = "V4L2 indev",
855 .item_name = av_default_item_name,
857 .version = LIBAVUTIL_VERSION_INT,
860 AVInputFormat ff_v4l2_demuxer = {
861 .name = "video4linux2,v4l2",
862 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
863 .priv_data_size = sizeof(struct video_data),
864 .read_header = v4l2_read_header,
865 .read_packet = v4l2_read_packet,
866 .read_close = v4l2_read_close,
867 .flags = AVFMT_NOFILE,
868 .priv_class = &v4l2_class,