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>
49 #include "libavutil/imgutils.h"
50 #include "libavutil/log.h"
51 #include "libavutil/opt.h"
53 #include "timefilter.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
77 * Return timestamps to the user exactly as returned by the kernel
79 #define V4L_TS_DEFAULT 0
81 * Autodetect the kind of timestamps returned by the kernel and convert to
82 * absolute (wall clock) timestamps.
86 * Assume kernel timestamps are from the monotonic clock and convert to
87 * absolute timestamps.
89 #define V4L_TS_MONO2ABS 2
92 * Once the kind of timestamps returned by the kernel have been detected,
93 * the value of the timefilter (NULL or not) determines whether a conversion
96 #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
101 int frame_format; /* V4L2_PIX_FMT_* */
107 TimeFilter *timefilter;
112 unsigned int *buf_len;
115 char *pixel_format; /**< Set by a private option. */
116 int list_format; /**< Set by a private option. */
117 char *framerate; /**< Set by a private option. */
126 enum PixelFormat ff_fmt;
127 enum CodecID codec_id;
131 static struct fmt_map fmt_conversion_table[] = {
132 //ff_fmt codec_id v4l2_fmt
133 { PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
134 { PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420 },
135 { PIX_FMT_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
136 { PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
137 { PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
138 { PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
139 { PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
140 { PIX_FMT_RGB555LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
141 { PIX_FMT_RGB555BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X },
142 { PIX_FMT_RGB565LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
143 { PIX_FMT_RGB565BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X },
144 { PIX_FMT_BGR24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
145 { PIX_FMT_RGB24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
146 { PIX_FMT_BGR0, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
147 { PIX_FMT_0RGB, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 },
148 { PIX_FMT_GRAY8, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
149 { PIX_FMT_NV12, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
150 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
151 { PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
154 static int device_open(AVFormatContext *ctx)
156 struct v4l2_capability cap;
164 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
168 fd = v4l2_open(ctx->filename, flags, 0);
172 av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
173 ctx->filename, strerror(err));
178 fd_libv4l = v4l2_fd_open(fd, 0);
180 err = AVERROR(errno);
181 av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n",
182 ctx->filename, strerror(errno));
188 res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap);
191 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
197 av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
198 fd, cap.capabilities);
200 if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
201 av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
207 if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
208 av_log(ctx, AV_LOG_ERROR,
209 "The device does not support the streaming I/O method.\n");
222 static int device_init(AVFormatContext *ctx, int *width, int *height,
225 struct video_data *s = ctx->priv_data;
227 struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
228 struct v4l2_pix_format *pix = &fmt.fmt.pix;
233 pix->height = *height;
234 pix->pixelformat = pix_fmt;
235 pix->field = V4L2_FIELD_ANY;
237 res = v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt);
239 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
240 av_log(ctx, AV_LOG_INFO,
241 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
242 *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
243 *width = fmt.fmt.pix.width;
244 *height = fmt.fmt.pix.height;
247 if (pix_fmt != fmt.fmt.pix.pixelformat) {
248 av_log(ctx, AV_LOG_DEBUG,
249 "The V4L2 driver changed the pixel format "
250 "from 0x%08X to 0x%08X\n",
251 pix_fmt, fmt.fmt.pix.pixelformat);
255 if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
256 av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
263 static int first_field(int fd)
268 res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
272 if (std & V4L2_STD_NTSC) {
279 static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
283 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
284 if ((codec_id == CODEC_ID_NONE ||
285 fmt_conversion_table[i].codec_id == codec_id) &&
286 (pix_fmt == PIX_FMT_NONE ||
287 fmt_conversion_table[i].ff_fmt == pix_fmt)) {
288 return fmt_conversion_table[i].v4l2_fmt;
295 static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
299 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
300 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
301 fmt_conversion_table[i].codec_id == codec_id) {
302 return fmt_conversion_table[i].ff_fmt;
309 static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
313 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
314 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
315 return fmt_conversion_table[i].codec_id;
319 return CODEC_ID_NONE;
322 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
323 static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
325 struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
327 while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
329 case V4L2_FRMSIZE_TYPE_DISCRETE:
330 av_log(ctx, AV_LOG_INFO, " %ux%u",
331 vfse.discrete.width, vfse.discrete.height);
333 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
334 case V4L2_FRMSIZE_TYPE_STEPWISE:
335 av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
336 vfse.stepwise.min_width,
337 vfse.stepwise.max_width,
338 vfse.stepwise.step_width,
339 vfse.stepwise.min_height,
340 vfse.stepwise.max_height,
341 vfse.stepwise.step_height);
348 static void list_formats(AVFormatContext *ctx, int fd, int type)
350 struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
352 while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
353 enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
354 enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
358 if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
359 type & V4L_RAWFORMATS) {
360 const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
361 av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
362 fmt_name ? fmt_name : "Unsupported",
364 } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
365 type & V4L_COMPFORMATS) {
366 AVCodec *codec = avcodec_find_encoder(codec_id);
367 av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
368 codec ? codec->name : "Unsupported",
374 #ifdef V4L2_FMT_FLAG_EMULATED
375 if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
376 av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
380 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
381 list_framesizes(ctx, fd, vfd.pixelformat);
383 av_log(ctx, AV_LOG_INFO, "\n");
387 static int mmap_init(AVFormatContext *ctx)
390 struct video_data *s = ctx->priv_data;
391 struct v4l2_requestbuffers req = {
392 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
393 .count = desired_video_buffers,
394 .memory = V4L2_MEMORY_MMAP
397 res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req);
399 if (errno == EINVAL) {
400 av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
402 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
404 return AVERROR(errno);
408 av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
409 return AVERROR(ENOMEM);
411 s->buffers = req.count;
412 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
413 if (s->buf_start == NULL) {
414 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
415 return AVERROR(ENOMEM);
417 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
418 if (s->buf_len == NULL) {
419 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
420 av_free(s->buf_start);
421 return AVERROR(ENOMEM);
424 for (i = 0; i < req.count; i++) {
425 struct v4l2_buffer buf = {
426 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
428 .memory = V4L2_MEMORY_MMAP
430 res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
432 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
433 return AVERROR(errno);
436 s->buf_len[i] = buf.length;
437 if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
438 av_log(ctx, AV_LOG_ERROR,
439 "Buffer len [%d] = %d != %d\n",
440 i, s->buf_len[i], s->frame_size);
444 s->buf_start[i] = v4l2_mmap(NULL, buf.length,
445 PROT_READ | PROT_WRITE, MAP_SHARED,
446 s->fd, buf.m.offset);
448 if (s->buf_start[i] == MAP_FAILED) {
449 av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
450 return AVERROR(errno);
457 static void mmap_release_buffer(AVPacket *pkt)
459 struct v4l2_buffer buf = { 0 };
461 struct buff_data *buf_descriptor = pkt->priv;
463 if (pkt->data == NULL)
466 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
467 buf.memory = V4L2_MEMORY_MMAP;
468 buf.index = buf_descriptor->index;
469 fd = buf_descriptor->fd;
470 av_free(buf_descriptor);
472 res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf);
474 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
481 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
482 static int64_t av_gettime_monotonic(void)
486 clock_gettime(CLOCK_MONOTONIC, &tv);
487 return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
491 static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
493 struct video_data *s = ctx->priv_data;
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;
503 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
504 now = av_gettime_monotonic();
505 if (s->ts_mode == V4L_TS_MONO2ABS ||
506 (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
507 int64_t period = av_rescale_q(1, ctx->streams[0]->codec->time_base,
509 av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
510 /* microseconds instead of seconds, MHz instead of Hz */
511 s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
512 s->ts_mode = V4L_TS_CONVERT_READY;
516 av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
520 static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
522 struct video_data *s = ctx->priv_data;
525 int r = init_convert_timestamp(ctx, *ts);
529 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
531 int64_t nowa = av_gettime();
532 int64_t nowm = av_gettime_monotonic();
533 ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
534 s->last_time_m = nowm;
535 *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
541 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
543 struct video_data *s = ctx->priv_data;
544 struct v4l2_buffer buf = {
545 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
546 .memory = V4L2_MEMORY_MMAP
548 struct buff_data *buf_descriptor;
551 /* FIXME: Some special treatment might be needed in case of loss of signal... */
552 while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
554 if (errno == EAGAIN) {
556 return AVERROR(EAGAIN);
558 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
561 return AVERROR(errno);
563 assert(buf.index < s->buffers);
564 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
565 av_log(ctx, AV_LOG_ERROR,
566 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
567 buf.bytesused, s->frame_size);
569 return AVERROR_INVALIDDATA;
572 /* Image is at s->buff_start[buf.index] */
573 pkt->data= s->buf_start[buf.index];
574 pkt->size = buf.bytesused;
575 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
576 res = convert_timestamp(ctx, &pkt->pts);
579 pkt->destruct = mmap_release_buffer;
580 buf_descriptor = av_malloc(sizeof(struct buff_data));
581 if (buf_descriptor == NULL) {
582 /* Something went wrong... Since av_malloc() failed, we cannot even
583 * allocate a buffer for memcopying into it
585 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
586 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
588 return AVERROR(ENOMEM);
590 buf_descriptor->fd = s->fd;
591 buf_descriptor->index = buf.index;
592 pkt->priv = buf_descriptor;
594 return s->buf_len[buf.index];
597 static int mmap_start(AVFormatContext *ctx)
599 struct video_data *s = ctx->priv_data;
600 enum v4l2_buf_type type;
603 for (i = 0; i < s->buffers; i++) {
604 struct v4l2_buffer buf = {
605 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
607 .memory = V4L2_MEMORY_MMAP
610 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
612 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
615 return AVERROR(errno);
619 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
620 res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type);
622 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
625 return AVERROR(errno);
631 static void mmap_close(struct video_data *s)
633 enum v4l2_buf_type type;
636 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
637 /* We do not check for the result, because we could
638 * not do anything about it anyway...
640 v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
641 for (i = 0; i < s->buffers; i++) {
642 v4l2_munmap(s->buf_start[i], s->buf_len[i]);
644 av_free(s->buf_start);
648 static int v4l2_set_parameters(AVFormatContext *s1)
650 struct video_data *s = s1->priv_data;
651 struct v4l2_input input = { 0 };
652 struct v4l2_standard standard = { 0 };
653 struct v4l2_streamparm streamparm = { 0 };
654 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
655 AVRational framerate_q = { 0 };
658 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
661 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
662 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
667 /* set tv video input */
668 input.index = s->channel;
669 if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
670 av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n");
674 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n",
675 s->channel, input.name);
676 if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) {
677 av_log(s1, AV_LOG_ERROR,
678 "The V4L2 driver ioctl set input(%d) failed\n",
684 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
686 /* set tv standard */
689 ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
690 if (ret < 0 || !av_strcasecmp(standard.name, s->standard))
694 av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard);
698 av_log(s1, AV_LOG_DEBUG,
699 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
700 s->standard, (uint64_t)standard.id);
701 if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
702 av_log(s1, AV_LOG_ERROR,
703 "The V4L2 driver ioctl set standard(%s) failed\n",
709 if (framerate_q.num && framerate_q.den) {
710 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
711 framerate_q.den, framerate_q.num);
712 tpf->numerator = framerate_q.den;
713 tpf->denominator = framerate_q.num;
715 if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
716 av_log(s1, AV_LOG_ERROR,
717 "ioctl set time per frame(%d/%d) failed\n",
718 framerate_q.den, framerate_q.num);
722 if (framerate_q.num != tpf->denominator ||
723 framerate_q.den != tpf->numerator) {
724 av_log(s1, AV_LOG_INFO,
725 "The driver changed the time per frame from "
727 framerate_q.den, framerate_q.num,
728 tpf->numerator, tpf->denominator);
731 if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
732 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
734 return AVERROR(errno);
737 s1->streams[0]->codec->time_base.den = tpf->denominator;
738 s1->streams[0]->codec->time_base.num = tpf->numerator;
743 static uint32_t device_try_init(AVFormatContext *s1,
744 enum PixelFormat pix_fmt,
747 enum CodecID *codec_id)
749 uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
751 if (desired_format == 0 ||
752 device_init(s1, width, height, desired_format) < 0) {
756 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
757 if (s1->video_codec_id == CODEC_ID_NONE ||
758 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
759 desired_format = fmt_conversion_table[i].v4l2_fmt;
760 if (device_init(s1, width, height, desired_format) >= 0) {
768 if (desired_format != 0) {
769 *codec_id = fmt_v4l2codec(desired_format);
770 assert(*codec_id != CODEC_ID_NONE);
773 return desired_format;
776 static int v4l2_read_header(AVFormatContext *s1)
778 struct video_data *s = s1->priv_data;
781 uint32_t desired_format;
782 enum CodecID codec_id;
783 enum PixelFormat pix_fmt = PIX_FMT_NONE;
785 st = avformat_new_stream(s1, NULL);
787 res = AVERROR(ENOMEM);
791 s->fd = device_open(s1);
797 if (s->list_format) {
798 list_formats(s1, s->fd, s->list_format);
803 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
805 if (s->pixel_format) {
806 AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
809 s1->video_codec_id = codec->id;
811 pix_fmt = av_get_pix_fmt(s->pixel_format);
813 if (pix_fmt == PIX_FMT_NONE && !codec) {
814 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
817 res = AVERROR(EINVAL);
822 if (!s->width && !s->height) {
823 struct v4l2_format fmt;
825 av_log(s1, AV_LOG_VERBOSE,
826 "Querying the device for the current frame size\n");
827 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
828 if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
829 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
831 res = AVERROR(errno);
835 s->width = fmt.fmt.pix.width;
836 s->height = fmt.fmt.pix.height;
837 av_log(s1, AV_LOG_VERBOSE,
838 "Setting frame size to %dx%d\n", s->width, s->height);
841 desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height,
843 if (desired_format == 0) {
844 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
845 "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
851 if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
854 s->frame_format = desired_format;
856 if ((res = v4l2_set_parameters(s1)) < 0)
859 st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
861 avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
863 if ((res = mmap_init(s1)) ||
864 (res = mmap_start(s1)) < 0) {
869 s->top_field_first = first_field(s->fd);
871 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
872 st->codec->codec_id = codec_id;
873 if (codec_id == CODEC_ID_RAWVIDEO)
874 st->codec->codec_tag =
875 avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
876 if (desired_format == V4L2_PIX_FMT_YVU420)
877 st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
878 st->codec->width = s->width;
879 st->codec->height = s->height;
880 st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
886 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
888 struct video_data *s = s1->priv_data;
889 AVFrame *frame = s1->streams[0]->codec->coded_frame;
893 if ((res = mmap_read_frame(s1, pkt)) < 0) {
897 if (frame && s->interlaced) {
898 frame->interlaced_frame = 1;
899 frame->top_field_first = s->top_field_first;
905 static int v4l2_read_close(AVFormatContext *s1)
907 struct video_data *s = s1->priv_data;
915 #define OFFSET(x) offsetof(struct video_data, x)
916 #define DEC AV_OPT_FLAG_DECODING_PARAM
918 static const AVOption options[] = {
919 { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
920 { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC },
921 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
922 { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
923 { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
924 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
925 { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" },
926 { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
927 { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
928 { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
929 { "timestamps", "Kind of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, DEC, "timestamps" },
930 { "default", "Use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" },
931 { "abs", "Use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_ABS }, 0, 2, DEC, "timestamps" },
932 { "mono2abs", "Force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
933 { "ts", "Kind of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, DEC, "timestamps" },
937 static const AVClass v4l2_class = {
938 .class_name = "V4L2 indev",
939 .item_name = av_default_item_name,
941 .version = LIBAVUTIL_VERSION_INT,
944 AVInputFormat ff_v4l2_demuxer = {
945 .name = "video4linux2,v4l2",
946 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
947 .priv_data_size = sizeof(struct video_data),
948 .read_header = v4l2_read_header,
949 .read_packet = v4l2_read_packet,
950 .read_close = v4l2_read_close,
951 .flags = AVFMT_NOFILE,
952 .priv_class = &v4l2_class,