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/*
* Linux video grab interface |
406792e7 |
* Copyright (c) 2000,2001 Fabrice Bellard |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#undef __STRICT_ANSI__ //workaround due to broken kernel headers |
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#include "config.h" |
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#include "libavutil/rational.h" |
245976da |
#include "libavformat/avformat.h"
#include "libavcodec/dsputil.h" |
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#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h> |
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#define _LINUX_TIME_H 1
#include <linux/videodev.h> |
608d0dee |
#include <time.h> |
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#include <strings.h> |
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typedef struct {
int fd;
int frame_format; /* see VIDEO_PALETTE_xxx */
int use_mmap; |
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AVRational time_base; |
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int64_t time_frame; |
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int frame_size; |
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struct video_capability video_cap;
struct video_audio audio_saved; |
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struct video_window video_win; |
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uint8_t *video_buf; |
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struct video_mbuf gb_buffers;
struct video_mmap gb_buf;
int gb_frame; |
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} VideoData;
|
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static const struct { |
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int palette;
int depth;
enum PixelFormat pix_fmt;
} video_formats [] = {
{.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = PIX_FMT_YUV420P },
{.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 }, |
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{.palette = VIDEO_PALETTE_UYVY, .depth = 16, .pix_fmt = PIX_FMT_UYVY422 },
{.palette = VIDEO_PALETTE_YUYV, .depth = 16, .pix_fmt = PIX_FMT_YUYV422 }, |
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/* NOTE: v4l uses BGR24, not RGB24 */
{.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = PIX_FMT_BGR24 }, |
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{.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = PIX_FMT_BGR565 }, |
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{.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = PIX_FMT_GRAY8 },
};
|
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static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap) |
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{ |
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VideoData *s = s1->priv_data; |
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AVStream *st; |
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int video_fd; |
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int desired_palette, desired_depth; |
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struct video_tuner tuner; |
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struct video_audio audio; |
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struct video_picture pict; |
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int j; |
37d3e066 |
int vformat_num = FF_ARRAY_ELEMS(video_formats); |
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|
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if (ap->time_base.den <= 0) {
av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den); |
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return -1; |
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} |
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s->time_base = ap->time_base; |
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|
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s->video_win.width = ap->width;
s->video_win.height = ap->height; |
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|
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st = av_new_stream(s1, 0);
if (!st) |
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return AVERROR(ENOMEM); |
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av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
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|
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video_fd = open(s1->filename, O_RDWR); |
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if (video_fd < 0) { |
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av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno)); |
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goto fail; |
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} |
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|
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if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) { |
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av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno)); |
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goto fail;
}
|
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if (!(s->video_cap.type & VID_TYPE_CAPTURE)) { |
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av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n"); |
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goto fail;
} |
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|
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/* no values set, autodetect them */
if (s->video_win.width <= 0 || s->video_win.height <= 0) {
if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
goto fail;
}
}
|
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if(avcodec_check_dimensions(s1, s->video_win.width, s->video_win.height) < 0)
return -1;
|
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desired_palette = -1; |
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desired_depth = -1; |
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for (j = 0; j < vformat_num; j++) {
if (ap->pix_fmt == video_formats[j].pix_fmt) {
desired_palette = video_formats[j].palette;
desired_depth = video_formats[j].depth;
break;
} |
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} |
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/* set tv standard */
if (ap->standard && !ioctl(video_fd, VIDIOCGTUNER, &tuner)) { |
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if (!strcasecmp(ap->standard, "pal"))
tuner.mode = VIDEO_MODE_PAL;
else if (!strcasecmp(ap->standard, "secam"))
tuner.mode = VIDEO_MODE_SECAM;
else
tuner.mode = VIDEO_MODE_NTSC;
ioctl(video_fd, VIDIOCSTUNER, &tuner); |
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} |
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|
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/* unmute audio */ |
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audio.audio = 0; |
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ioctl(video_fd, VIDIOCGAUDIO, &audio); |
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memcpy(&s->audio_saved, &audio, sizeof(audio)); |
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audio.flags &= ~VIDEO_AUDIO_MUTE;
ioctl(video_fd, VIDIOCSAUDIO, &audio);
|
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ioctl(video_fd, VIDIOCGPICT, &pict);
#if 0
printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
pict.colour,
pict.hue,
pict.brightness,
pict.contrast,
pict.whiteness);
#endif
/* try to choose a suitable video format */
pict.palette = desired_palette; |
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pict.depth= desired_depth; |
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if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) { |
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for (j = 0; j < vformat_num; j++) {
pict.palette = video_formats[j].palette;
pict.depth = video_formats[j].depth;
if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
break; |
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} |
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if (j >= vformat_num)
goto fail1; |
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}
|
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if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) { |
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/* try to use read based access */
int val;
|
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s->video_win.x = 0;
s->video_win.y = 0;
s->video_win.chromakey = -1;
s->video_win.flags = 0; |
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|
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if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
goto fail;
} |
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s->frame_format = pict.palette;
val = 1; |
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if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
goto fail;
} |
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|
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s->time_frame = av_gettime() * s->time_base.den / s->time_base.num; |
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s->use_mmap = 0;
} else { |
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s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0); |
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if ((unsigned char*)-1 == s->video_buf) { |
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s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0); |
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if ((unsigned char*)-1 == s->video_buf) { |
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av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno)); |
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goto fail;
} |
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} |
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s->gb_frame = 0; |
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s->time_frame = av_gettime() * s->time_base.den / s->time_base.num; |
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|
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/* start to grab the first frame */ |
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s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames; |
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s->gb_buf.height = s->video_win.height;
s->gb_buf.width = s->video_win.width; |
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s->gb_buf.format = pict.palette;
|
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if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) { |
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if (errno != EAGAIN) {
fail1: |
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av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno)); |
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} else { |
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av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n"); |
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}
goto fail;
} |
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for (j = 1; j < s->gb_buffers.frames; j++) {
s->gb_buf.frame = j;
ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
} |
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s->frame_format = s->gb_buf.format; |
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s->use_mmap = 1;
}
|
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for (j = 0; j < vformat_num; j++) {
if (s->frame_format == video_formats[j].palette) { |
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s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8; |
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st->codec->pix_fmt = video_formats[j].pix_fmt;
break;
} |
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} |
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if (j >= vformat_num)
goto fail;
|
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s->fd = video_fd; |
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|
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st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = CODEC_ID_RAWVIDEO; |
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st->codec->width = s->video_win.width;
st->codec->height = s->video_win.height; |
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st->codec->time_base = s->time_base; |
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st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8; |
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|
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return 0;
fail: |
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if (video_fd >= 0)
close(video_fd); |
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return AVERROR(EIO); |
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}
|
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static int v4l_mm_read_picture(VideoData *s, uint8_t *buf) |
de6d9b64 |
{ |
0c1a9eda |
uint8_t *ptr; |
de6d9b64 |
|
7aae3168 |
while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
(errno == EAGAIN || errno == EINTR));
ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
memcpy(buf, ptr, s->frame_size);
|
4606ac8d |
/* Setup to capture the next frame */ |
7aae3168 |
s->gb_buf.frame = s->gb_frame; |
8949367e |
if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) { |
28c66901 |
if (errno == EAGAIN) |
bc874dae |
av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n"); |
28c66901 |
else |
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av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno)); |
6f3e0b21 |
return AVERROR(EIO); |
de6d9b64 |
} |
4606ac8d |
/* This is now the grabbing frame */ |
7aae3168 |
s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames; |
4606ac8d |
|
4972b26f |
return s->frame_size; |
de6d9b64 |
}
|
4972b26f |
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt) |
de6d9b64 |
{ |
4972b26f |
VideoData *s = s1->priv_data; |
0c1a9eda |
int64_t curtime, delay; |
4972b26f |
struct timespec ts; |
4606ac8d |
/* Calculate the time of the next frame */ |
8da9266c |
s->time_frame += INT64_C(1000000); |
de6d9b64 |
/* wait based on the frame rate */ |
45dd5c69 |
for(;;) { |
a11bf0bd |
curtime = av_gettime(); |
9580ba26 |
delay = s->time_frame * s->time_base.num / s->time_base.den - curtime; |
4606ac8d |
if (delay <= 0) { |
9580ba26 |
if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) { |
4606ac8d |
/* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */ |
8da9266c |
s->time_frame += INT64_C(1000000); |
4606ac8d |
} |
4972b26f |
break; |
115329f1 |
} |
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ts.tv_sec = delay / 1000000;
ts.tv_nsec = (delay % 1000000) * 1000;
nanosleep(&ts, NULL);
}
if (av_new_packet(pkt, s->frame_size) < 0) |
6f3e0b21 |
return AVERROR(EIO); |
de6d9b64 |
|
0a7b514f |
pkt->pts = curtime; |
45dd5c69 |
|
de6d9b64 |
/* read one frame */ |
3ab64e46 |
if (s->use_mmap) { |
4972b26f |
return v4l_mm_read_picture(s, pkt->data); |
de6d9b64 |
} else { |
4972b26f |
if (read(s->fd, pkt->data, pkt->size) != pkt->size) |
6f3e0b21 |
return AVERROR(EIO); |
4972b26f |
return s->frame_size; |
de6d9b64 |
}
}
|
4972b26f |
static int grab_read_close(AVFormatContext *s1) |
de6d9b64 |
{ |
4972b26f |
VideoData *s = s1->priv_data; |
e61efa24 |
if (s->use_mmap) |
8949367e |
munmap(s->video_buf, s->gb_buffers.size); |
e61efa24 |
|
8949367e |
/* mute audio. we must force it because the BTTV driver does not
return its state correctly */
s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved); |
5a56c87c |
|
de6d9b64 |
close(s->fd);
return 0;
}
|
fd484da7 |
AVInputFormat v4l_demuxer = { |
8aa3ee32 |
"video4linux", |
df2a3f27 |
NULL_IF_CONFIG_SMALL("Video4Linux device grab"), |
c9a65ca8 |
sizeof(VideoData), |
4972b26f |
NULL,
grab_read_header,
grab_read_packet,
grab_read_close, |
bb76a117 |
.flags = AVFMT_NOFILE, |
de6d9b64 |
}; |