/*
* FreeBSD video grab interface
* Copyright (c) 2002 Steve O'Hara-Smith
* based on
* Linux video grab interface
* Copyright (c) 2000,2001 Gerard Lantau.
* and
* simple_grab.c Copyright (c) 1999 Roger Hardiman
*
* GPL virus inherited:
*
* 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 "avformat.h"
#include <machine/ioctl_meteor.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <signal.h>
typedef struct {
int fd;
int tuner_fd;
int frame_format; /* see VIDEO_PALETTE_xxx */
int width, height;
int frame_rate;
int frame_size;
} VideoData;
const char *video_device = "/dev/bktr0";
#define GRABBER_SETTLE_TIME 3
#define PAL 1
#define NTSC 2
/* PAL is 768 x 576. NTSC is 640 x 480 */
#define PAL_HEIGHT 576
#define NTSC_HEIGHT 480
#ifndef VIDEO_FORMAT
#define VIDEO_FORMAT NTSC
#endif
#ifndef VIDEO_INPUT
#define VIDEO_INPUT METEOR_INPUT_DEV0;
#endif
static UINT8 *video_buf;
static int signal_expected = 0;
static int unexpected_signals = 0;
static void catchsignal(int signal)
{
if (!signal_expected) unexpected_signals++;
signal_expected = 0;
return;
}
static int bktr_init(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
int width, height;
int video_fd;
int format = VIDEO_FORMAT;
struct meteor_geomet geo;
int c;
struct sigaction act,old;
memset(&act,0,sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_handler = catchsignal;
sigaction(SIGUSR1,&act,&old);
sigaction(SIGALRM,&act,&old);
width = s->width;
height = s->height;
s->tuner_fd = open ("/dev/tuner0", O_RDWR);
if (s->tuner_fd < 0) {
perror("Warning: Tuner not opened continuing");
}
video_fd = open(video_device, O_RDWR);
if (video_fd < 0) {
perror(video_device);
return -EIO;
}
s->fd=video_fd;
geo.rows = height;
geo.columns = width;
geo.frames = 1;
geo.oformat = METEOR_GEO_YUV_PACKED;
if ((format == PAL) && (height <= (PAL_HEIGHT/2)))
geo.oformat |= METEOR_GEO_EVEN_ONLY;
if ((format == NTSC) && (height <= (NTSC_HEIGHT/2)))
geo.oformat |= METEOR_GEO_EVEN_ONLY;
if (ioctl(video_fd, METEORSETGEO, &geo) < 0) {
perror ("METEORSETGEO");
return -EIO;
}
switch (format) {
case PAL: c = METEOR_FMT_PAL; break;
case NTSC: c = METEOR_FMT_NTSC; break;
default: c = METEOR_FMT_PAL; break;
}
if (ioctl(video_fd, METEORSFMT, &c) < 0) {
perror ("METEORSFMT");
return -EIO;
}
c = VIDEO_INPUT;
if (ioctl(video_fd, METEORSINPUT, &c) < 0) {
perror ("METEORSINPUT");
return -EIO;
}
video_buf = mmap((caddr_t)0, width*height*2, PROT_READ, MAP_SHARED,
video_fd, (off_t) 0);
if (video_buf == MAP_FAILED) {
perror ("mmap");
return -EIO;
}
c = METEOR_CAP_CONTINOUS;
ioctl(s->fd, METEORCAPTUR, &c);
c = SIGUSR1;
signal_expected = 1;
ioctl (s->fd, METEORSSIGNAL, &c);
return 0;
}
static void bf_yuv422_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
UINT8 *src, int width, int height)
{
int x, y;
UINT8 *p = src;
for(y=0;y<height;y+=2) {
for(x=0;x<width;x+=2) {
lum[0] = p[1];
cb[0] = p[0];
lum[1] = p[3];
cr[0] = p[2];
p += 4;
lum += 2;
cb++;
cr++;
}
for(x=0;x<width;x+=2) {
lum[0] = p[1];
lum[1] = p[3];
p += 4;
lum += 2;
}
}
}
/* note: we support only one picture read at a time */
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
VideoData *s = s1->priv_data;
int size, halfsize;
sigset_t msig;
UINT8 *lum, *cb, *cr;
size = s->width * s->height;
halfsize = size << 1;
if (av_new_packet(pkt, size + halfsize) < 0)
return -EIO;
if (unexpected_signals > 0) {
unexpected_signals--;
} else {
signal_expected = 1;
sigemptyset (&msig);
sigsuspend (&msig);
}
if (unexpected_signals & 1) {
bzero (pkt->data, size + halfsize);
} else {
lum = pkt->data;
cb = lum + size;
cr = cb + size/4;
bf_yuv422_to_yuv420p (lum, cb, cr, video_buf, s->width, s->height);
}
return size + halfsize;
}
static int grab_read_header (AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
AVStream *st;
int width, height;
int frame_rate;
if (!ap || ap->width <= 0 || ap->height <= 0 || ap->frame_rate <= 0)
return -1;
width = ap->width;
height = ap->height;
frame_rate = ap->frame_rate;
st = av_new_stream(s1, 0);
if (!st)
return -ENOMEM;
s1->priv_data = s;
s1->nb_streams = 1;
s1->streams[0] = st;
s->width = width;
s->height = height;
s->frame_rate = frame_rate;
s->frame_size = width*height*2;
st->codec.pix_fmt = PIX_FMT_YUV420P;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.width = width;
st->codec.height = height;
st->codec.frame_rate = frame_rate;
return bktr_init(s1, ap);
}
static int grab_read_close (AVFormatContext *s1)
{
VideoData *s = s1->priv_data;
int c = METEOR_CAP_STOP_CONT;
ioctl(s->fd, METEORCAPTUR, &c);
close(s->fd);
close(s->tuner_fd);
free(s);
return 0;
}
AVInputFormat video_grab_device_format = {
"video_grab_device",
"video grab",
sizeof(VideoData),
NULL,
grab_read_header,
grab_read_packet,
grab_read_close,
flags: AVFMT_NOFILE,
};
int video_grab_init(void)
{
av_register_input_format(&video_grab_device_format);
return 0;
}
