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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 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"

#include "libavutil/parseutils.h"

#include "libavutil/time.h"

#if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H

# include 

# include 

#elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H

# include 

# include 

#elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H

# include 

# include 

#elif HAVE_DEV_IC_BT8XX_H

# include 

#endif

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include "avdevice.h"

typedef struct {

    AVClass *class;

    int video_fd;

    int tuner_fd;

    int width, height;

    uint64_t per_frame;

    int standard;

    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 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 = { {0} }, 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;

    }

    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) {

        av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));

        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) {

        av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));

        return -1;

    }

    if (ioctl(*video_fd, BT848SFMT, &c) < 0) {

        av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));

        return -1;

    }

    c = bktr_dev[idev];

    if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {

        av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));

        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) {

        av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));

        return -1;

    }

    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);

        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;

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codec->pix_fmt = AV_PIX_FMT_YUV420P;

    st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;

    st->codec->width = s->width;

    st->codec->height = s->height;

    st->codec->time_base.den = framerate.num;

    st->codec->time_base.num = framerate.den;

    if (bktr_init(s1->filename, 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;

}

#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" },

    { "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,

};

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,

};