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_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
112 { PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
113 { PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
114 { PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
115 { PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
116 { PIX_FMT_RGB555, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
117 { PIX_FMT_RGB565, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
118 { PIX_FMT_BGR24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
119 { PIX_FMT_RGB24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
120 { PIX_FMT_BGRA, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
121 { PIX_FMT_GRAY8, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
122 { PIX_FMT_NV12, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
123 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
124 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
127 static int device_open(AVFormatContext *ctx)
129 struct v4l2_capability cap;
137 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
141 fd = v4l2_open(ctx->filename, flags, 0);
145 av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
146 ctx->filename, strerror(err));
151 fd_libv4l = v4l2_fd_open(fd, 0);
153 err = AVERROR(errno);
154 av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n",
155 ctx->filename, strerror(errno));
161 res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap);
164 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
170 av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
171 fd, cap.capabilities);
173 if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
174 av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
180 if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
181 av_log(ctx, AV_LOG_ERROR,
182 "The device does not support the streaming I/O method.\n");
195 static int device_init(AVFormatContext *ctx, int *width, int *height,
198 struct video_data *s = ctx->priv_data;
200 struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
201 struct v4l2_pix_format *pix = &fmt.fmt.pix;
206 pix->height = *height;
207 pix->pixelformat = pix_fmt;
208 pix->field = V4L2_FIELD_ANY;
210 res = v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt);
212 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
213 av_log(ctx, AV_LOG_INFO,
214 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
215 *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
216 *width = fmt.fmt.pix.width;
217 *height = fmt.fmt.pix.height;
220 if (pix_fmt != fmt.fmt.pix.pixelformat) {
221 av_log(ctx, AV_LOG_DEBUG,
222 "The V4L2 driver changed the pixel format "
223 "from 0x%08X to 0x%08X\n",
224 pix_fmt, fmt.fmt.pix.pixelformat);
228 if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
229 av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
236 static int first_field(int fd)
241 res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
245 if (std & V4L2_STD_NTSC) {
252 static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
256 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
257 if ((codec_id == CODEC_ID_NONE ||
258 fmt_conversion_table[i].codec_id == codec_id) &&
259 (pix_fmt == PIX_FMT_NONE ||
260 fmt_conversion_table[i].ff_fmt == pix_fmt)) {
261 return fmt_conversion_table[i].v4l2_fmt;
268 static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
272 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
273 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
274 fmt_conversion_table[i].codec_id == codec_id) {
275 return fmt_conversion_table[i].ff_fmt;
282 static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
286 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
287 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
288 return fmt_conversion_table[i].codec_id;
292 return CODEC_ID_NONE;
295 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
296 static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
298 struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
300 while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
302 case V4L2_FRMSIZE_TYPE_DISCRETE:
303 av_log(ctx, AV_LOG_INFO, " %ux%u",
304 vfse.discrete.width, vfse.discrete.height);
306 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
307 case V4L2_FRMSIZE_TYPE_STEPWISE:
308 av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
309 vfse.stepwise.min_width,
310 vfse.stepwise.max_width,
311 vfse.stepwise.step_width,
312 vfse.stepwise.min_height,
313 vfse.stepwise.max_height,
314 vfse.stepwise.step_height);
321 static void list_formats(AVFormatContext *ctx, int fd, int type)
323 struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
325 while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
326 enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
327 enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
331 if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
332 type & V4L_RAWFORMATS) {
333 const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
334 av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
335 fmt_name ? fmt_name : "Unsupported",
337 } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
338 type & V4L_COMPFORMATS) {
339 AVCodec *codec = avcodec_find_encoder(codec_id);
340 av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
341 codec ? codec->name : "Unsupported",
347 #ifdef V4L2_FMT_FLAG_EMULATED
348 if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
349 av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
353 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
354 list_framesizes(ctx, fd, vfd.pixelformat);
356 av_log(ctx, AV_LOG_INFO, "\n");
360 static int mmap_init(AVFormatContext *ctx)
363 struct video_data *s = ctx->priv_data;
364 struct v4l2_requestbuffers req = {
365 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
366 .count = desired_video_buffers,
367 .memory = V4L2_MEMORY_MMAP
370 res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req);
372 if (errno == EINVAL) {
373 av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
375 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
377 return AVERROR(errno);
381 av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
382 return AVERROR(ENOMEM);
384 s->buffers = req.count;
385 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
386 if (s->buf_start == NULL) {
387 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
388 return AVERROR(ENOMEM);
390 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
391 if (s->buf_len == NULL) {
392 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
393 av_free(s->buf_start);
394 return AVERROR(ENOMEM);
397 for (i = 0; i < req.count; i++) {
398 struct v4l2_buffer buf = {
399 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
401 .memory = V4L2_MEMORY_MMAP
403 res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
405 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
406 return AVERROR(errno);
409 s->buf_len[i] = buf.length;
410 if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
411 av_log(ctx, AV_LOG_ERROR,
412 "Buffer len [%d] = %d != %d\n",
413 i, s->buf_len[i], s->frame_size);
417 s->buf_start[i] = v4l2_mmap(NULL, buf.length,
418 PROT_READ | PROT_WRITE, MAP_SHARED,
419 s->fd, buf.m.offset);
421 if (s->buf_start[i] == MAP_FAILED) {
422 av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
423 return AVERROR(errno);
430 static void mmap_release_buffer(AVPacket *pkt)
432 struct v4l2_buffer buf = { 0 };
434 struct buff_data *buf_descriptor = pkt->priv;
436 if (pkt->data == NULL)
439 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
440 buf.memory = V4L2_MEMORY_MMAP;
441 buf.index = buf_descriptor->index;
442 fd = buf_descriptor->fd;
443 av_free(buf_descriptor);
445 res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf);
447 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
454 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
456 struct video_data *s = ctx->priv_data;
457 struct v4l2_buffer buf = {
458 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
459 .memory = V4L2_MEMORY_MMAP
461 struct buff_data *buf_descriptor;
464 /* FIXME: Some special treatment might be needed in case of loss of signal... */
465 while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
467 if (errno == EAGAIN) {
469 return AVERROR(EAGAIN);
471 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
474 return AVERROR(errno);
476 assert(buf.index < s->buffers);
477 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
478 av_log(ctx, AV_LOG_ERROR,
479 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
480 buf.bytesused, s->frame_size);
482 return AVERROR_INVALIDDATA;
485 /* Image is at s->buff_start[buf.index] */
486 pkt->data= s->buf_start[buf.index];
487 pkt->size = buf.bytesused;
488 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
489 pkt->destruct = mmap_release_buffer;
490 buf_descriptor = av_malloc(sizeof(struct buff_data));
491 if (buf_descriptor == NULL) {
492 /* Something went wrong... Since av_malloc() failed, we cannot even
493 * allocate a buffer for memcopying into it
495 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
496 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
498 return AVERROR(ENOMEM);
500 buf_descriptor->fd = s->fd;
501 buf_descriptor->index = buf.index;
502 pkt->priv = buf_descriptor;
504 return s->buf_len[buf.index];
507 static int mmap_start(AVFormatContext *ctx)
509 struct video_data *s = ctx->priv_data;
510 enum v4l2_buf_type type;
513 for (i = 0; i < s->buffers; i++) {
514 struct v4l2_buffer buf = {
515 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
517 .memory = V4L2_MEMORY_MMAP
520 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
522 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
525 return AVERROR(errno);
529 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
530 res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type);
532 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
535 return AVERROR(errno);
541 static void mmap_close(struct video_data *s)
543 enum v4l2_buf_type type;
546 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
547 /* We do not check for the result, because we could
548 * not do anything about it anyway...
550 v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
551 for (i = 0; i < s->buffers; i++) {
552 v4l2_munmap(s->buf_start[i], s->buf_len[i]);
554 av_free(s->buf_start);
558 static int v4l2_set_parameters(AVFormatContext *s1)
560 struct video_data *s = s1->priv_data;
561 struct v4l2_input input = { 0 };
562 struct v4l2_standard standard = { 0 };
563 struct v4l2_streamparm streamparm = { 0 };
564 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
565 AVRational framerate_q = { 0 };
568 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
571 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
572 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
577 /* set tv video input */
578 input.index = s->channel;
579 if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
580 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
584 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
585 s->channel, input.name);
586 if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
587 av_log(s1, AV_LOG_ERROR,
588 "The V4L2 driver ioctl set input(%d) failed\n",
594 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
596 /* set tv standard */
599 ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
600 if (ret < 0 || !av_strcasecmp(standard.name, s->standard))
604 av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard);
608 av_log(s1, AV_LOG_DEBUG,
609 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
610 s->standard, (uint64_t)standard.id);
611 if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
612 av_log(s1, AV_LOG_ERROR,
613 "The V4L2 driver ioctl set standard(%s) failed\n",
619 if (framerate_q.num && framerate_q.den) {
620 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
621 framerate_q.den, framerate_q.num);
622 tpf->numerator = framerate_q.den;
623 tpf->denominator = framerate_q.num;
625 if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
626 av_log(s1, AV_LOG_ERROR,
627 "ioctl set time per frame(%d/%d) failed\n",
628 framerate_q.den, framerate_q.num);
632 if (framerate_q.num != tpf->denominator ||
633 framerate_q.den != tpf->numerator) {
634 av_log(s1, AV_LOG_INFO,
635 "The driver changed the time per frame from "
637 framerate_q.den, framerate_q.num,
638 tpf->numerator, tpf->denominator);
641 if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
642 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
644 return AVERROR(errno);
647 s1->streams[0]->codec->time_base.den = tpf->denominator;
648 s1->streams[0]->codec->time_base.num = tpf->numerator;
653 static uint32_t device_try_init(AVFormatContext *s1,
654 enum PixelFormat pix_fmt,
657 enum CodecID *codec_id)
659 uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
661 if (desired_format == 0 ||
662 device_init(s1, width, height, desired_format) < 0) {
666 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
667 if (s1->video_codec_id == CODEC_ID_NONE ||
668 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
669 desired_format = fmt_conversion_table[i].v4l2_fmt;
670 if (device_init(s1, width, height, desired_format) >= 0) {
678 if (desired_format != 0) {
679 *codec_id = fmt_v4l2codec(desired_format);
680 assert(*codec_id != CODEC_ID_NONE);
683 return desired_format;
686 static int v4l2_read_header(AVFormatContext *s1)
688 struct video_data *s = s1->priv_data;
691 uint32_t desired_format;
692 enum CodecID codec_id;
693 enum PixelFormat pix_fmt = PIX_FMT_NONE;
695 st = avformat_new_stream(s1, NULL);
697 res = AVERROR(ENOMEM);
701 s->fd = device_open(s1);
707 if (s->list_format) {
708 list_formats(s1, s->fd, s->list_format);
713 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
716 (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
717 av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
722 if (s->pixel_format) {
723 AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
726 s1->video_codec_id = codec->id;
728 pix_fmt = av_get_pix_fmt(s->pixel_format);
730 if (pix_fmt == PIX_FMT_NONE && !codec) {
731 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
734 res = AVERROR(EINVAL);
739 if (!s->width && !s->height) {
740 struct v4l2_format fmt;
742 av_log(s1, AV_LOG_VERBOSE,
743 "Querying the device for the current frame size\n");
744 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
745 if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
746 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
748 res = AVERROR(errno);
752 s->width = fmt.fmt.pix.width;
753 s->height = fmt.fmt.pix.height;
754 av_log(s1, AV_LOG_VERBOSE,
755 "Setting frame size to %dx%d\n", s->width, s->height);
758 desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
760 if (desired_format == 0) {
761 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
762 "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
768 if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
771 s->frame_format = desired_format;
773 if ((res = v4l2_set_parameters(s1)) < 0)
776 st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
778 avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
780 if ((res = mmap_init(s1)) ||
781 (res = mmap_start(s1)) < 0) {
786 s->top_field_first = first_field(s->fd);
788 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
789 st->codec->codec_id = codec_id;
790 if (codec_id == CODEC_ID_RAWVIDEO)
791 st->codec->codec_tag =
792 avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
793 st->codec->width = s->width;
794 st->codec->height = s->height;
795 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
801 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
803 struct video_data *s = s1->priv_data;
804 AVFrame *frame = s1->streams[0]->codec->coded_frame;
808 if ((res = mmap_read_frame(s1, pkt)) < 0) {
812 if (frame && s->interlaced) {
813 frame->interlaced_frame = 1;
814 frame->top_field_first = s->top_field_first;
820 static int v4l2_read_close(AVFormatContext *s1)
822 struct video_data *s = s1->priv_data;
830 #define OFFSET(x) offsetof(struct video_data, x)
831 #define DEC AV_OPT_FLAG_DECODING_PARAM
833 static const AVOption options[] = {
834 { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
835 { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC },
836 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
837 { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
838 { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
839 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
840 { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
841 { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
842 { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
843 { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
847 static const AVClass v4l2_class = {
848 .class_name = "V4L2 indev",
849 .item_name = av_default_item_name,
851 .version = LIBAVUTIL_VERSION_INT,
854 AVInputFormat ff_v4l2_demuxer = {
855 .name = "video4linux2,v4l2",
856 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
857 .priv_data_size = sizeof(struct video_data),
858 .read_header = v4l2_read_header,
859 .read_packet = v4l2_read_packet,
860 .read_close = v4l2_read_close,
861 .flags = AVFMT_NOFILE,
862 .priv_class = &v4l2_class,