/*
  * *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/log.h"
 #include "libavutil/opt.h"

 #include "libavutil/parseutils.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 {

     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 = 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 = 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 = 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,

 };