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ffmpeg/libavformat/grab_bktr.c

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/*
* *BSD 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
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#if defined(__FreeBSD__)
# if __FreeBSD__ >= 502100
# include <dev/bktr/ioctl_meteor.h>
# include <dev/bktr/ioctl_bt848.h>
# else
# include <machine/ioctl_meteor.h>
# include <machine/ioctl_bt848.h>
# endif
#elif defined(__FreeBSD_kernel__)
# include <dev/bktr/ioctl_meteor.h>
# include <dev/bktr/ioctl_bt848.h>
#elif defined(__DragonFly__)
# include <dev/video/meteor/ioctl_meteor.h>
# include <dev/video/bktr/ioctl_bt848.h>
#else
# include <dev/ic/bt8xx.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <signal.h>
typedef struct {
int video_fd;
int tuner_fd;
int width, height;
int frame_rate;
int frame_rate_base;
u_int64_t per_frame;
} VideoData;
#define PAL 1
#define PALBDGHI 1
#define NTSC 2
#define NTSCM 2
#define SECAM 3
#define PALN 4
#define PALM 5
#define NTSCJ 6
/* PAL is 768 x 576. NTSC is 640 x 480 */
#define PAL_HEIGHT 576
#define SECAM_HEIGHT 576
#define NTSC_HEIGHT 480
#ifndef VIDEO_FORMAT
#define VIDEO_FORMAT NTSC
#endif
static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
METEOR_DEV3, METEOR_DEV_SVIDEO };
uint8_t *video_buf;
size_t video_buf_size;
u_int64_t last_frame_time;
volatile sig_atomic_t nsignals;
static void catchsignal(int signal)
{
nsignals++;
return;
}
static int bktr_init(const char *video_device, int width, int height,
int format, int *video_fd, int *tuner_fd, int idev, double frequency)
{
struct meteor_geomet geo;
int h_max;
long ioctl_frequency;
char *arg;
int c;
struct sigaction act, old;
if (idev < 0 || idev > 4)
{
arg = getenv ("BKTR_DEV");
if (arg)
idev = atoi (arg);
if (idev < 0 || idev > 4)
idev = 1;
}
if (format < 1 || format > 6)
{
arg = getenv ("BKTR_FORMAT");
if (arg)
format = atoi (arg);
if (format < 1 || format > 6)
format = VIDEO_FORMAT;
}
if (frequency <= 0)
{
arg = getenv ("BKTR_FREQUENCY");
if (arg)
frequency = atof (arg);
if (frequency <= 0)
frequency = 0.0;
}
memset(&act, 0, sizeof(act));
sigemptyset(&act.sa_mask);
act.sa_handler = catchsignal;
sigaction(SIGUSR1, &act, &old);
*tuner_fd = open("/dev/tuner0", O_RDONLY);
if (*tuner_fd < 0)
perror("Warning: Tuner not opened, continuing");
*video_fd = open(video_device, O_RDONLY);
if (*video_fd < 0) {
perror(video_device);
return -1;
}
geo.rows = height;
geo.columns = width;
geo.frames = 1;
geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
switch (format) {
case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
}
if (height <= h_max / 2)
geo.oformat |= METEOR_GEO_EVEN_ONLY;
if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
perror("METEORSETGEO");
return -1;
}
if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
perror("BT848SFMT");
return -1;
}
c = bktr_dev[idev];
if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
perror("METEORSINPUT");
return -1;
}
video_buf_size = width * height * 12 / 8;
video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
if (video_buf == MAP_FAILED) {
perror("mmap");
return -1;
}
if (frequency != 0.0) {
ioctl_frequency = (unsigned long)(frequency*16);
if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
perror("TVTUNER_SETFREQ");
}
c = AUDIO_UNMUTE;
if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
perror("TVTUNER_SAUDIO");
c = METEOR_CAP_CONTINOUS;
ioctl(*video_fd, METEORCAPTUR, &c);
c = SIGUSR1;
ioctl(*video_fd, METEORSSIGNAL, &c);
return 0;
}
static void bktr_getframe(u_int64_t per_frame)
{
u_int64_t curtime;
curtime = av_gettime();
if (!last_frame_time
|| ((last_frame_time + per_frame) > curtime)) {
if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
if (!nsignals)
av_log(NULL, AV_LOG_INFO,
"SLEPT NO signals - %d microseconds late\n",
(int)(av_gettime() - last_frame_time - per_frame));
}
}
nsignals = 0;
last_frame_time = curtime;
}
/* note: we support only one picture read at a time */
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
VideoData *s = s1->priv_data;
if (av_new_packet(pkt, video_buf_size) < 0)
return -EIO;
bktr_getframe(s->per_frame);
pkt->pts = av_gettime();
memcpy(pkt->data, video_buf, video_buf_size);
return video_buf_size;
}
static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
{
VideoData *s = s1->priv_data;
AVStream *st;
int width, height;
int frame_rate;
int frame_rate_base;
int format = -1;
const char *video_device;
if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
return -1;
width = ap->width;
height = ap->height;
frame_rate = ap->time_base.den;
frame_rate_base = ap->time_base.num;
video_device = ap->device;
if (!video_device)
video_device = "/dev/bktr0";
st = av_new_stream(s1, 0);
if (!st)
return -ENOMEM;
av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
s->width = width;
s->height = height;
s->frame_rate = frame_rate;
s->frame_rate_base = frame_rate_base;
s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->pix_fmt = PIX_FMT_YUV420P;
st->codec->codec_id = CODEC_ID_RAWVIDEO;
st->codec->width = width;
st->codec->height = height;
st->codec->time_base.den = frame_rate;
st->codec->time_base.num = frame_rate_base;
if (ap->standard) {
if (!strcasecmp(ap->standard, "pal"))
format = PAL;
else if (!strcasecmp(ap->standard, "secam"))
format = SECAM;
else if (!strcasecmp(ap->standard, "ntsc"))
format = NTSC;
}
if (bktr_init(video_device, width, height, format,
&(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
return -EIO;
nsignals = 0;
last_frame_time = 0;
return 0;
}
static int grab_read_close(AVFormatContext *s1)
{
VideoData *s = s1->priv_data;
int c;
c = METEOR_CAP_STOP_CONT;
ioctl(s->video_fd, METEORCAPTUR, &c);
close(s->video_fd);
c = AUDIO_MUTE;
ioctl(s->tuner_fd, BT848_SAUDIO, &c);
close(s->tuner_fd);
munmap((caddr_t)video_buf, video_buf_size);
return 0;
}
AVInputFormat video_grab_device_demuxer = {
"bktr",
"video grab",
sizeof(VideoData),
NULL,
grab_read_header,
grab_read_packet,
grab_read_close,
.flags = AVFMT_NOFILE,
};
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