mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-27 13:30:45 +00:00
322 lines
8.0 KiB
C
322 lines
8.0 KiB
C
/*
|
|
* Linux video grab interface
|
|
* Copyright (c) 2000,2001 Gerard Lantau.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <linux/videodev.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <errno.h>
|
|
#include <sys/time.h>
|
|
|
|
#include "avformat.h"
|
|
|
|
typedef struct {
|
|
int fd;
|
|
int frame_format; /* see VIDEO_PALETTE_xxx */
|
|
int use_mmap;
|
|
int width, height;
|
|
float rate;
|
|
INT64 time_frame;
|
|
} VideoData;
|
|
|
|
const char *v4l_device = "/dev/video";
|
|
|
|
/* XXX: move all that to the context */
|
|
|
|
static struct video_capability video_cap;
|
|
static UINT8 *video_buf;
|
|
static struct video_mbuf gb_buffers;
|
|
static struct video_mmap gb_buf;
|
|
static struct video_audio audio;
|
|
static int gb_frame = 0;
|
|
|
|
static int v4l_init(URLContext *h)
|
|
{
|
|
VideoData *s = h->priv_data;
|
|
int width, height;
|
|
int ret;
|
|
int video_fd, frame_size;
|
|
|
|
width = s->width;
|
|
height = s->height;
|
|
|
|
video_fd = open(v4l_device, O_RDWR);
|
|
if (video_fd < 0) {
|
|
perror(v4l_device);
|
|
return -EIO;
|
|
}
|
|
|
|
if (ioctl(video_fd,VIDIOCGCAP,&video_cap) < 0) {
|
|
perror("VIDIOCGCAP");
|
|
goto fail;
|
|
}
|
|
|
|
if (!(video_cap.type & VID_TYPE_CAPTURE)) {
|
|
fprintf(stderr, "Fatal: grab device does not handle capture\n");
|
|
goto fail;
|
|
}
|
|
|
|
/* unmute audio */
|
|
ioctl(video_fd, VIDIOCGAUDIO, &audio);
|
|
audio.flags &= ~VIDEO_AUDIO_MUTE;
|
|
ioctl(video_fd, VIDIOCSAUDIO, &audio);
|
|
|
|
ret = ioctl(video_fd,VIDIOCGMBUF,&gb_buffers);
|
|
if (ret < 0) {
|
|
/* try to use read based access */
|
|
struct video_window win;
|
|
struct video_picture pict;
|
|
int val;
|
|
|
|
win.x = 0;
|
|
win.y = 0;
|
|
win.width = width;
|
|
win.height = height;
|
|
win.chromakey = -1;
|
|
win.flags = 0;
|
|
|
|
ioctl(video_fd, VIDIOCSWIN, &win);
|
|
|
|
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=VIDEO_PALETTE_YUV420P;
|
|
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
|
|
if (ret < 0) {
|
|
pict.palette=VIDEO_PALETTE_YUV422;
|
|
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
|
|
if (ret < 0) {
|
|
pict.palette=VIDEO_PALETTE_RGB24;
|
|
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
|
|
if (ret < 0)
|
|
goto fail1;
|
|
}
|
|
}
|
|
|
|
s->frame_format = pict.palette;
|
|
|
|
val = 1;
|
|
ioctl(video_fd, VIDIOCCAPTURE, &val);
|
|
|
|
s->time_frame = gettime();
|
|
s->use_mmap = 0;
|
|
} else {
|
|
video_buf = mmap(0,gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,video_fd,0);
|
|
if ((unsigned char*)-1 == video_buf) {
|
|
perror("mmap");
|
|
goto fail;
|
|
}
|
|
gb_frame = 0;
|
|
s->time_frame = gettime();
|
|
|
|
/* start to grab the first frame */
|
|
gb_buf.frame = 1 - gb_frame;
|
|
gb_buf.height = height;
|
|
gb_buf.width = width;
|
|
gb_buf.format = VIDEO_PALETTE_YUV420P;
|
|
|
|
ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
|
|
if (ret < 0 && errno != EAGAIN) {
|
|
/* try YUV422 */
|
|
gb_buf.format = VIDEO_PALETTE_YUV422;
|
|
|
|
ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
|
|
if (ret < 0 && errno != EAGAIN) {
|
|
/* try RGB24 */
|
|
gb_buf.format = VIDEO_PALETTE_RGB24;
|
|
ret = ioctl(video_fd, VIDIOCMCAPTURE, &gb_buf);
|
|
}
|
|
}
|
|
if (ret < 0) {
|
|
if (errno != EAGAIN) {
|
|
fail1:
|
|
fprintf(stderr, "Fatal: grab device does not support suitable format\n");
|
|
} else {
|
|
fprintf(stderr,"Fatal: grab device does not receive any video signal\n");
|
|
}
|
|
goto fail;
|
|
}
|
|
s->frame_format = gb_buf.format;
|
|
s->use_mmap = 1;
|
|
}
|
|
|
|
switch(s->frame_format) {
|
|
case VIDEO_PALETTE_YUV420P:
|
|
frame_size = (width * height * 3) / 2;
|
|
break;
|
|
case VIDEO_PALETTE_YUV422:
|
|
frame_size = width * height * 2;
|
|
break;
|
|
case VIDEO_PALETTE_RGB24:
|
|
frame_size = width * height * 3;
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
s->fd = video_fd;
|
|
h->packet_size = frame_size;
|
|
return 0;
|
|
fail:
|
|
close(video_fd);
|
|
return -EIO;
|
|
}
|
|
|
|
static int v4l_mm_read_picture(URLContext *h, UINT8 *buf)
|
|
{
|
|
VideoData *s = h->priv_data;
|
|
UINT8 *ptr;
|
|
|
|
gb_buf.frame = gb_frame;
|
|
if (ioctl(s->fd, VIDIOCMCAPTURE, &gb_buf) < 0) {
|
|
if (errno == EAGAIN)
|
|
fprintf(stderr,"Cannot Sync\n");
|
|
else
|
|
perror("VIDIOCMCAPTURE");
|
|
return -EIO;
|
|
}
|
|
gb_frame = 1 - gb_frame;
|
|
|
|
while (ioctl(s->fd, VIDIOCSYNC, &gb_frame) < 0 &&
|
|
(errno == EAGAIN || errno == EINTR));
|
|
|
|
ptr = video_buf + gb_buffers.offsets[gb_frame];
|
|
memcpy(buf, ptr, h->packet_size);
|
|
return h->packet_size;
|
|
}
|
|
|
|
/* note: we support only one picture read at a time */
|
|
static int video_read(URLContext *h, UINT8 *buf, int size)
|
|
{
|
|
VideoData *s = h->priv_data;
|
|
INT64 curtime;
|
|
|
|
if (size != h->packet_size)
|
|
return -EINVAL;
|
|
|
|
/* wait based on the frame rate */
|
|
s->time_frame += (int)(1000000 / s->rate);
|
|
do {
|
|
curtime = gettime();
|
|
} while (curtime < s->time_frame);
|
|
|
|
/* read one frame */
|
|
if (s->use_mmap) {
|
|
return v4l_mm_read_picture(h, buf);
|
|
} else {
|
|
if (read(s->fd, buf, size) != size)
|
|
return -EIO;
|
|
return h->packet_size;
|
|
}
|
|
}
|
|
|
|
static int video_get_format(URLContext *h, URLFormat *f)
|
|
{
|
|
VideoData *s = h->priv_data;
|
|
|
|
f->width = s->width;
|
|
f->height = s->height;
|
|
f->frame_rate = (int)(s->rate * FRAME_RATE_BASE);
|
|
strcpy(f->format_name, "rawvideo");
|
|
|
|
switch(s->frame_format) {
|
|
case VIDEO_PALETTE_YUV420P:
|
|
f->pix_fmt = PIX_FMT_YUV420P;
|
|
break;
|
|
case VIDEO_PALETTE_YUV422:
|
|
f->pix_fmt = PIX_FMT_YUV422;
|
|
break;
|
|
case VIDEO_PALETTE_RGB24:
|
|
f->pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* URI syntax: 'video:width,height,rate'
|
|
*/
|
|
static int video_open(URLContext *h, const char *uri, int flags)
|
|
{
|
|
VideoData *s;
|
|
const char *p;
|
|
int width, height;
|
|
int ret;
|
|
float rate;
|
|
|
|
/* extract parameters */
|
|
p = uri;
|
|
strstart(p, "video:", &p);
|
|
width = strtol(p, (char **)&p, 0);
|
|
if (width <= 0)
|
|
return -EINVAL;
|
|
if (*p == ',')
|
|
p++;
|
|
height = strtol(p, (char **)&p, 0);
|
|
if (height <= 0)
|
|
return -EINVAL;
|
|
if (*p == ',')
|
|
p++;
|
|
rate = strtod(p, (char **)&p);
|
|
if (rate <= 0)
|
|
return -EINVAL;
|
|
|
|
s = malloc(sizeof(VideoData));
|
|
if (!s)
|
|
return -ENOMEM;
|
|
h->priv_data = s;
|
|
h->is_streamed = 1;
|
|
s->width = width;
|
|
s->height = height;
|
|
s->rate = rate;
|
|
ret = v4l_init(h);
|
|
if (ret)
|
|
free(s);
|
|
return ret;
|
|
}
|
|
|
|
static int video_close(URLContext *h)
|
|
{
|
|
VideoData *s = h->priv_data;
|
|
|
|
close(s->fd);
|
|
free(s);
|
|
return 0;
|
|
}
|
|
|
|
URLProtocol video_protocol = {
|
|
"video",
|
|
video_open,
|
|
video_read,
|
|
NULL,
|
|
NULL, /* seek */
|
|
video_close,
|
|
video_get_format,
|
|
};
|