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FFmpeg/libavdevice/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 Fabrice Bellard
* and
* simple_grab.c Copyright (c) 1999 Roger Hardiman
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavformat/internal.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
# include <dev/bktr/ioctl_meteor.h>
# include <dev/bktr/ioctl_bt848.h>
#elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
# include <machine/ioctl_meteor.h>
# include <machine/ioctl_bt848.h>
#elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
# include <dev/video/meteor/ioctl_meteor.h>
# include <dev/video/bktr/ioctl_bt848.h>
#elif HAVE_DEV_IC_BT8XX_H
# 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>
#include <stdint.h>
#include "avdevice.h"
typedef struct VideoData {
AVClass *class;
int video_fd;
int tuner_fd;
int width, height;
uint64_t per_frame;
int standard;
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char *framerate; /**< Set by a private option. */
} 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 const int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
METEOR_DEV3, METEOR_DEV_SVIDEO };
uint8_t *video_buf;
size_t video_buf_size;
uint64_t last_frame_time;
volatile sig_atomic_t nsignals;
static void catchsignal(int signal)
{
nsignals++;
return;
}
static av_cold 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;
int ret;
char errbuf[128];
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 = avpriv_open("/dev/tuner0", O_RDONLY);
if (*tuner_fd < 0)
av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
*video_fd = avpriv_open(video_device, O_RDONLY);
if (*video_fd < 0) {
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, errbuf);
return ret;
}
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) {
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", errbuf);
return ret;
}
if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", errbuf);
return ret;
}
c = bktr_dev[idev];
if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", errbuf);
return ret;
}
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) {
ret = AVERROR(errno);
av_strerror(ret, errbuf, sizeof(errbuf));
av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", errbuf);
return ret;
}
if (frequency != 0.0) {
ioctl_frequency = (unsigned long)(frequency*16);
if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
}
c = AUDIO_UNMUTE;
if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
c = METEOR_CAP_CONTINOUS;
ioctl(*video_fd, METEORCAPTUR, &c);
c = SIGUSR1;
ioctl(*video_fd, METEORSSIGNAL, &c);
return 0;
}
static void bktr_getframe(uint64_t per_frame)
{
uint64_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 AVERROR(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)
{
VideoData *s = s1->priv_data;
AVStream *st;
AVRational framerate;
int ret = 0;
if (!s->framerate)
switch (s->standard) {
case PAL: s->framerate = av_strdup("pal"); break;
case NTSC: s->framerate = av_strdup("ntsc"); break;
case SECAM: s->framerate = av_strdup("25"); break;
default:
av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
ret = AVERROR(EINVAL);
goto out;
}
if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
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goto out;
}
st = avformat_new_stream(s1, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto out;
}
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->format = AV_PIX_FMT_YUV420P;
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
st->codecpar->width = s->width;
st->codecpar->height = s->height;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->avg_frame_rate = framerate;
if (bktr_init(s1->url, s->width, s->height, s->standard,
&s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
ret = AVERROR(EIO);
goto out;
}
nsignals = 0;
last_frame_time = 0;
out:
return ret;
}
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;
}
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#define OFFSET(x) offsetof(VideoData, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
{ "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
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{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
{ NULL },
};
static const AVClass bktr_class = {
.class_name = "BKTR grab interface",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
};
AVInputFormat ff_bktr_demuxer = {
.name = "bktr",
.long_name = NULL_IF_CONFIG_SMALL("video grab"),
.priv_data_size = sizeof(VideoData),
.read_header = grab_read_header,
.read_packet = grab_read_packet,
.read_close = grab_read_close,
.flags = AVFMT_NOFILE,
.priv_class = &bktr_class,
};