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 #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/avassert.h"
50 #include "libavutil/imgutils.h"
51 #include "libavutil/log.h"
52 #include "libavutil/opt.h"
54 #include "timefilter.h"
55 #include "libavutil/parseutils.h"
56 #include "libavutil/pixdesc.h"
57 #include "libavutil/avstring.h"
62 #define v4l2_open open
63 #define v4l2_close close
65 #define v4l2_ioctl ioctl
66 #define v4l2_read read
67 #define v4l2_mmap mmap
68 #define v4l2_munmap munmap
71 static const int desired_video_buffers = 256;
73 #define V4L_ALLFORMATS 3
74 #define V4L_RAWFORMATS 1
75 #define V4L_COMPFORMATS 2
78 * Return timestamps to the user exactly as returned by the kernel
80 #define V4L_TS_DEFAULT 0
82 * Autodetect the kind of timestamps returned by the kernel and convert to
83 * absolute (wall clock) timestamps.
87 * Assume kernel timestamps are from the monotonic clock and convert to
88 * absolute timestamps.
90 #define V4L_TS_MONO2ABS 2
93 * Once the kind of timestamps returned by the kernel have been detected,
94 * the value of the timefilter (NULL or not) determines whether a conversion
97 #define V4L_TS_CONVERT_READY V4L_TS_DEFAULT
102 int frame_format; /* V4L2_PIX_FMT_* */
108 TimeFilter *timefilter;
113 unsigned int *buf_len;
117 char *pixel_format; /**< Set by a private option. */
118 int list_format; /**< Set by a private option. */
119 char *framerate; /**< Set by a private option. */
128 enum AVPixelFormat ff_fmt;
129 enum AVCodecID codec_id;
133 static struct fmt_map fmt_conversion_table[] = {
134 //ff_fmt codec_id v4l2_fmt
135 { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
136 { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420 },
137 { AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
138 { AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
139 { AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
140 { AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
141 { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
142 { AV_PIX_FMT_RGB555LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
143 { AV_PIX_FMT_RGB555BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X },
144 { AV_PIX_FMT_RGB565LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
145 { AV_PIX_FMT_RGB565BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X },
146 { AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
147 { AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
148 { AV_PIX_FMT_BGR0, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
149 { AV_PIX_FMT_0RGB, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 },
150 { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
151 { AV_PIX_FMT_NV12, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
152 { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
153 { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
154 #ifdef V4L2_PIX_FMT_H264
155 { AV_PIX_FMT_NONE, AV_CODEC_ID_H264, V4L2_PIX_FMT_H264 },
157 #ifdef V4L2_PIX_FMT_CPIA1
158 { AV_PIX_FMT_NONE, AV_CODEC_ID_CPIA, V4L2_PIX_FMT_CPIA1 },
162 static int device_open(AVFormatContext *ctx)
164 struct v4l2_capability cap;
169 if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
173 fd = v4l2_open(ctx->filename, flags, 0);
177 av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n",
178 ctx->filename, strerror(err));
183 res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap);
186 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
192 av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n",
193 fd, cap.capabilities);
195 if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
196 av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
202 if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
203 av_log(ctx, AV_LOG_ERROR,
204 "The device does not support the streaming I/O method.\n");
217 static int device_init(AVFormatContext *ctx, int *width, int *height,
220 struct video_data *s = ctx->priv_data;
222 struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
223 struct v4l2_pix_format *pix = &fmt.fmt.pix;
228 pix->height = *height;
229 pix->pixelformat = pix_fmt;
230 pix->field = V4L2_FIELD_ANY;
232 if (v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt) < 0)
233 res = AVERROR(errno);
235 if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) {
236 av_log(ctx, AV_LOG_INFO,
237 "The V4L2 driver changed the video from %dx%d to %dx%d\n",
238 *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height);
239 *width = fmt.fmt.pix.width;
240 *height = fmt.fmt.pix.height;
243 if (pix_fmt != fmt.fmt.pix.pixelformat) {
244 av_log(ctx, AV_LOG_DEBUG,
245 "The V4L2 driver changed the pixel format "
246 "from 0x%08X to 0x%08X\n",
247 pix_fmt, fmt.fmt.pix.pixelformat);
248 res = AVERROR(EINVAL);
251 if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
252 av_log(ctx, AV_LOG_DEBUG,
253 "The V4L2 driver is using the interlaced mode\n");
260 static int first_field(int fd)
265 res = v4l2_ioctl(fd, VIDIOC_G_STD, &std);
269 if (std & V4L2_STD_NTSC) {
276 static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id)
280 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
281 if ((codec_id == AV_CODEC_ID_NONE ||
282 fmt_conversion_table[i].codec_id == codec_id) &&
283 (pix_fmt == AV_PIX_FMT_NONE ||
284 fmt_conversion_table[i].ff_fmt == pix_fmt)) {
285 return fmt_conversion_table[i].v4l2_fmt;
292 static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id)
296 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
297 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt &&
298 fmt_conversion_table[i].codec_id == codec_id) {
299 return fmt_conversion_table[i].ff_fmt;
303 return AV_PIX_FMT_NONE;
306 static enum AVCodecID fmt_v4l2codec(uint32_t v4l2_fmt)
310 for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
311 if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) {
312 return fmt_conversion_table[i].codec_id;
316 return AV_CODEC_ID_NONE;
319 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
320 static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
322 struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
324 while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
326 case V4L2_FRMSIZE_TYPE_DISCRETE:
327 av_log(ctx, AV_LOG_INFO, " %ux%u",
328 vfse.discrete.width, vfse.discrete.height);
330 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
331 case V4L2_FRMSIZE_TYPE_STEPWISE:
332 av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
333 vfse.stepwise.min_width,
334 vfse.stepwise.max_width,
335 vfse.stepwise.step_width,
336 vfse.stepwise.min_height,
337 vfse.stepwise.max_height,
338 vfse.stepwise.step_height);
345 static void list_formats(AVFormatContext *ctx, int fd, int type)
347 struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
349 while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
350 enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
351 enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
355 if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
356 type & V4L_RAWFORMATS) {
357 const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
358 av_log(ctx, AV_LOG_INFO, "Raw : %9s : %20s :",
359 fmt_name ? fmt_name : "Unsupported",
361 } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
362 type & V4L_COMPFORMATS) {
363 AVCodec *codec = avcodec_find_decoder(codec_id);
364 av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :",
365 codec ? codec->name : "Unsupported",
371 #ifdef V4L2_FMT_FLAG_EMULATED
372 if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
373 av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
377 #if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
378 list_framesizes(ctx, fd, vfd.pixelformat);
380 av_log(ctx, AV_LOG_INFO, "\n");
384 static int mmap_init(AVFormatContext *ctx)
387 struct video_data *s = ctx->priv_data;
388 struct v4l2_requestbuffers req = {
389 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
390 .count = desired_video_buffers,
391 .memory = V4L2_MEMORY_MMAP
394 res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req);
396 if (errno == EINVAL) {
397 av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n");
399 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n");
401 return AVERROR(errno);
405 av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
406 return AVERROR(ENOMEM);
408 s->buffers = req.count;
409 s->buf_start = av_malloc(sizeof(void *) * s->buffers);
410 if (s->buf_start == NULL) {
411 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
412 return AVERROR(ENOMEM);
414 s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
415 if (s->buf_len == NULL) {
416 av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
417 av_free(s->buf_start);
418 return AVERROR(ENOMEM);
421 for (i = 0; i < req.count; i++) {
422 struct v4l2_buffer buf = {
423 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
425 .memory = V4L2_MEMORY_MMAP
427 res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
429 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
430 return AVERROR(errno);
433 s->buf_len[i] = buf.length;
434 if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) {
435 av_log(ctx, AV_LOG_ERROR,
436 "Buffer len [%d] = %d != %d\n",
437 i, s->buf_len[i], s->frame_size);
441 s->buf_start[i] = v4l2_mmap(NULL, buf.length,
442 PROT_READ | PROT_WRITE, MAP_SHARED,
443 s->fd, buf.m.offset);
445 if (s->buf_start[i] == MAP_FAILED) {
446 av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
447 return AVERROR(errno);
454 static void mmap_release_buffer(AVPacket *pkt)
456 struct v4l2_buffer buf = { 0 };
458 struct buff_data *buf_descriptor = pkt->priv;
460 if (pkt->data == NULL)
463 buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
464 buf.memory = V4L2_MEMORY_MMAP;
465 buf.index = buf_descriptor->index;
466 fd = buf_descriptor->fd;
467 av_free(buf_descriptor);
469 res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf);
471 av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
478 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
479 static int64_t av_gettime_monotonic(void)
483 clock_gettime(CLOCK_MONOTONIC, &tv);
484 return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000;
488 static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts)
490 struct video_data *s = ctx->priv_data;
494 if (s->ts_mode == V4L_TS_ABS &&
495 ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) {
496 av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n");
497 s->ts_mode = V4L_TS_CONVERT_READY;
500 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
501 now = av_gettime_monotonic();
502 if (s->ts_mode == V4L_TS_MONO2ABS ||
503 (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) {
504 int64_t period = av_rescale_q(1, AV_TIME_BASE_Q,
505 ctx->streams[0]->avg_frame_rate);
506 av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n");
507 /* microseconds instead of seconds, MHz instead of Hz */
508 s->timefilter = ff_timefilter_new(1, period, 1.0E-6);
509 s->ts_mode = V4L_TS_CONVERT_READY;
513 av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n");
517 static int convert_timestamp(AVFormatContext *ctx, int64_t *ts)
519 struct video_data *s = ctx->priv_data;
522 int r = init_convert_timestamp(ctx, *ts);
526 #if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC)
528 int64_t nowa = av_gettime();
529 int64_t nowm = av_gettime_monotonic();
530 ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m);
531 s->last_time_m = nowm;
532 *ts = ff_timefilter_eval(s->timefilter, *ts - nowm);
538 static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
540 struct video_data *s = ctx->priv_data;
541 struct v4l2_buffer buf = {
542 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
543 .memory = V4L2_MEMORY_MMAP
545 struct buff_data *buf_descriptor;
548 /* FIXME: Some special treatment might be needed in case of loss of signal... */
549 while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR));
551 if (errno == EAGAIN) {
553 return AVERROR(EAGAIN);
555 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
558 return AVERROR(errno);
561 if (buf.index >= s->buffers) {
562 av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
563 return AVERROR(EINVAL);
566 /* CPIA is a compressed format and we don't know the exact number of bytes
567 * used by a frame, so set it here as the driver announces it.
569 if (ctx->video_codec_id == AV_CODEC_ID_CPIA)
570 s->frame_size = buf.bytesused;
572 if (s->frame_size > 0 && buf.bytesused != s->frame_size) {
573 av_log(ctx, AV_LOG_ERROR,
574 "The v4l2 frame is %d bytes, but %d bytes are expected\n",
575 buf.bytesused, s->frame_size);
577 return AVERROR_INVALIDDATA;
580 /* Image is at s->buff_start[buf.index] */
581 pkt->data= s->buf_start[buf.index];
582 pkt->size = buf.bytesused;
583 pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
584 res = convert_timestamp(ctx, &pkt->pts);
587 pkt->destruct = mmap_release_buffer;
588 buf_descriptor = av_malloc(sizeof(struct buff_data));
589 if (buf_descriptor == NULL) {
590 /* Something went wrong... Since av_malloc() failed, we cannot even
591 * allocate a buffer for memcopying into it
593 av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
594 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
596 return AVERROR(ENOMEM);
598 buf_descriptor->fd = s->fd;
599 buf_descriptor->index = buf.index;
600 pkt->priv = buf_descriptor;
602 return s->buf_len[buf.index];
605 static int mmap_start(AVFormatContext *ctx)
607 struct video_data *s = ctx->priv_data;
608 enum v4l2_buf_type type;
611 for (i = 0; i < s->buffers; i++) {
612 struct v4l2_buffer buf = {
613 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
615 .memory = V4L2_MEMORY_MMAP
618 res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf);
620 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
623 return AVERROR(errno);
627 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
628 res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type);
630 av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
633 return AVERROR(errno);
639 static void mmap_close(struct video_data *s)
641 enum v4l2_buf_type type;
644 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
645 /* We do not check for the result, because we could
646 * not do anything about it anyway...
648 v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type);
649 for (i = 0; i < s->buffers; i++) {
650 v4l2_munmap(s->buf_start[i], s->buf_len[i]);
652 av_free(s->buf_start);
656 static int v4l2_set_parameters(AVFormatContext *s1)
658 struct video_data *s = s1->priv_data;
659 struct v4l2_standard standard = { 0 };
660 struct v4l2_streamparm streamparm = { 0 };
661 struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe;
662 AVRational framerate_q = { 0 };
665 streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
668 (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) {
669 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n",
675 av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
677 /* set tv standard */
680 ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard);
681 if (ret < 0 || !av_strcasecmp(standard.name, s->standard))
685 av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard);
689 av_log(s1, AV_LOG_DEBUG,
690 "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
691 s->standard, (uint64_t)standard.id);
692 if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) {
693 av_log(s1, AV_LOG_ERROR,
694 "The V4L2 driver ioctl set standard(%s) failed\n",
700 if (framerate_q.num && framerate_q.den) {
701 av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n",
702 framerate_q.den, framerate_q.num);
703 tpf->numerator = framerate_q.den;
704 tpf->denominator = framerate_q.num;
706 if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) {
707 av_log(s1, AV_LOG_ERROR,
708 "ioctl set time per frame(%d/%d) failed\n",
709 framerate_q.den, framerate_q.num);
713 if (framerate_q.num != tpf->denominator ||
714 framerate_q.den != tpf->numerator) {
715 av_log(s1, AV_LOG_INFO,
716 "The driver changed the time per frame from "
718 framerate_q.den, framerate_q.num,
719 tpf->numerator, tpf->denominator);
722 if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
723 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
725 return AVERROR(errno);
728 s1->streams[0]->avg_frame_rate.num = tpf->denominator;
729 s1->streams[0]->avg_frame_rate.den = tpf->numerator;
734 static int device_try_init(AVFormatContext *s1,
735 enum AVPixelFormat pix_fmt,
738 uint32_t *desired_format,
739 enum AVCodecID *codec_id)
743 *desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id);
745 if (*desired_format) {
746 ret = device_init(s1, width, height, *desired_format);
749 if (ret != AVERROR(EINVAL))
754 if (!*desired_format) {
755 for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
756 if (s1->video_codec_id == AV_CODEC_ID_NONE ||
757 fmt_conversion_table[i].codec_id == s1->video_codec_id) {
758 av_log(s1, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n",
759 avcodec_get_name(fmt_conversion_table[i].codec_id),
760 (char *)av_x_if_null(av_get_pix_fmt_name(fmt_conversion_table[i].ff_fmt), "none"));
762 *desired_format = fmt_conversion_table[i].v4l2_fmt;
763 ret = device_init(s1, width, height, *desired_format);
766 else if (ret != AVERROR(EINVAL))
772 if (*desired_format == 0) {
773 av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for "
774 "codec '%s' (id %d), pixel format '%s' (id %d)\n",
775 avcodec_get_name(s1->video_codec_id), s1->video_codec_id,
776 (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt);
777 ret = AVERROR(EINVAL);
781 *codec_id = fmt_v4l2codec(*desired_format);
782 av_assert0(*codec_id != AV_CODEC_ID_NONE);
786 static int v4l2_read_header(AVFormatContext *s1)
788 struct video_data *s = s1->priv_data;
791 uint32_t desired_format;
792 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
793 enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
794 struct v4l2_input input = { 0 };
796 st = avformat_new_stream(s1, NULL);
798 return AVERROR(ENOMEM);
800 s->fd = device_open(s1);
804 /* set tv video input */
805 av_log(s1, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel);
806 if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) {
808 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", strerror(errno));
812 input.index = s->channel;
813 if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) {
815 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", strerror(errno));
818 s->std_id = input.std;
819 av_log(s1, AV_LOG_DEBUG, "input_channel: %d, input_name: %s\n",
820 s->channel, input.name);
822 if (s->list_format) {
823 list_formats(s1, s->fd, s->list_format);
827 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
829 if (s->pixel_format) {
830 AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
833 s1->video_codec_id = codec->id;
835 pix_fmt = av_get_pix_fmt(s->pixel_format);
837 if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
838 av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
841 return AVERROR(EINVAL);
845 if (!s->width && !s->height) {
846 struct v4l2_format fmt;
848 av_log(s1, AV_LOG_VERBOSE,
849 "Querying the device for the current frame size\n");
850 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
851 if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
852 av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
854 return AVERROR(errno);
857 s->width = fmt.fmt.pix.width;
858 s->height = fmt.fmt.pix.height;
859 av_log(s1, AV_LOG_VERBOSE,
860 "Setting frame size to %dx%d\n", s->width, s->height);
863 res = device_try_init(s1, pix_fmt, &s->width, &s->height, &desired_format, &codec_id);
869 /* If no pixel_format was specified, the codec_id was not known up
870 * until now. Set video_codec_id in the context, as codec_id will
871 * not be available outside this function
873 if (codec_id != AV_CODEC_ID_NONE && s1->video_codec_id == AV_CODEC_ID_NONE)
874 s1->video_codec_id = codec_id;
876 if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0)
879 s->frame_format = desired_format;
881 if ((res = v4l2_set_parameters(s1)) < 0)
884 st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
886 avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
888 if ((res = mmap_init(s1)) ||
889 (res = mmap_start(s1)) < 0) {
894 s->top_field_first = first_field(s->fd);
896 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
897 st->codec->codec_id = codec_id;
898 if (codec_id == AV_CODEC_ID_RAWVIDEO)
899 st->codec->codec_tag =
900 avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
901 if (desired_format == V4L2_PIX_FMT_YVU420)
902 st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
903 st->codec->width = s->width;
904 st->codec->height = s->height;
905 st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
910 static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
912 struct video_data *s = s1->priv_data;
913 AVFrame *frame = s1->streams[0]->codec->coded_frame;
917 if ((res = mmap_read_frame(s1, pkt)) < 0) {
921 if (frame && s->interlaced) {
922 frame->interlaced_frame = 1;
923 frame->top_field_first = s->top_field_first;
929 static int v4l2_read_close(AVFormatContext *s1)
931 struct video_data *s = s1->priv_data;
939 #define OFFSET(x) offsetof(struct video_data, x)
940 #define DEC AV_OPT_FLAG_DECODING_PARAM
942 static const AVOption options[] = {
943 { "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC },
944 { "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC },
945 { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
946 { "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
947 { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
948 { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
950 { "list_formats", "list available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
951 { "all", "show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
952 { "raw", "show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
953 { "compressed", "show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
955 { "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" },
956 { "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" },
957 { "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" },
958 { "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, "timestamps" },
959 { "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" },
964 static const AVClass v4l2_class = {
965 .class_name = "V4L2 indev",
966 .item_name = av_default_item_name,
968 .version = LIBAVUTIL_VERSION_INT,
971 AVInputFormat ff_v4l2_demuxer = {
972 .name = "video4linux2,v4l2",
973 .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"),
974 .priv_data_size = sizeof(struct video_data),
975 .read_header = v4l2_read_header,
976 .read_packet = v4l2_read_packet,
977 .read_close = v4l2_read_close,
978 .flags = AVFMT_NOFILE,
979 .priv_class = &v4l2_class,