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  1. /*
  2.  * *BSD video grab interface
  3.  * Copyright (c) 2002 Steve O'Hara-Smith
  4.  * based on
  5.  *           Linux video grab interface
  6.  *           Copyright (c) 2000,2001 Gerard Lantau
  7.  * and
  8.  *           simple_grab.c Copyright (c) 1999 Roger Hardiman
  9.  *
  10.  * This file is part of FFmpeg.
  11.  *
  12.  * FFmpeg is free software; you can redistribute it and/or
  13.  * modify it under the terms of the GNU Lesser General Public
  14.  * License as published by the Free Software Foundation; either
  15.  * version 2.1 of the License, or (at your option) any later version.
  16.  *
  17.  * FFmpeg is distributed in the hope that it will be useful,
  18.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20.  * Lesser General Public License for more details.
  21.  *
  22.  * You should have received a copy of the GNU Lesser General Public
  23.  * License along with FFmpeg; if not, write to the Free Software
  24.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  25.  */
  26.  
  27. #include "libavformat/internal.h"
  28. #include "libavutil/internal.h"
  29. #include "libavutil/log.h"
  30. #include "libavutil/opt.h"
  31. #include "libavutil/parseutils.h"
  32. #include "libavutil/time.h"
  33. #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
  34. # include <dev/bktr/ioctl_meteor.h>
  35. # include <dev/bktr/ioctl_bt848.h>
  36. #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
  37. # include <machine/ioctl_meteor.h>
  38. # include <machine/ioctl_bt848.h>
  39. #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
  40. # include <dev/video/meteor/ioctl_meteor.h>
  41. # include <dev/video/bktr/ioctl_bt848.h>
  42. #elif HAVE_DEV_IC_BT8XX_H
  43. # include <dev/ic/bt8xx.h>
  44. #endif
  45. #include <unistd.h>
  46. #include <fcntl.h>
  47. #include <sys/ioctl.h>
  48. #include <sys/mman.h>
  49. #include <sys/time.h>
  50. #include <signal.h>
  51. #include <stdint.h>
  52. #include "avdevice.h"
  53.  
  54. typedef struct {
  55.     AVClass *class;
  56.     int video_fd;
  57.     int tuner_fd;
  58.     int width, height;
  59.     uint64_t per_frame;
  60.     int standard;
  61.     char *framerate;  /**< Set by a private option. */
  62. } VideoData;
  63.  
  64.  
  65. #define PAL 1
  66. #define PALBDGHI 1
  67. #define NTSC 2
  68. #define NTSCM 2
  69. #define SECAM 3
  70. #define PALN 4
  71. #define PALM 5
  72. #define NTSCJ 6
  73.  
  74. /* PAL is 768 x 576. NTSC is 640 x 480 */
  75. #define PAL_HEIGHT 576
  76. #define SECAM_HEIGHT 576
  77. #define NTSC_HEIGHT 480
  78.  
  79. #ifndef VIDEO_FORMAT
  80. #define VIDEO_FORMAT NTSC
  81. #endif
  82.  
  83. static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
  84.     METEOR_DEV3, METEOR_DEV_SVIDEO };
  85.  
  86. uint8_t *video_buf;
  87. size_t video_buf_size;
  88. uint64_t last_frame_time;
  89. volatile sig_atomic_t nsignals;
  90.  
  91.  
  92. static void catchsignal(int signal)
  93. {
  94.     nsignals++;
  95.     return;
  96. }
  97.  
  98. static av_cold int bktr_init(const char *video_device, int width, int height,
  99.     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
  100. {
  101.     struct meteor_geomet geo;
  102.     int h_max;
  103.     long ioctl_frequency;
  104.     char *arg;
  105.     int c;
  106.     struct sigaction act = { {0} }, old;
  107.  
  108.     if (idev < 0 || idev > 4)
  109.     {
  110.         arg = getenv ("BKTR_DEV");
  111.         if (arg)
  112.             idev = atoi (arg);
  113.         if (idev < 0 || idev > 4)
  114.             idev = 1;
  115.     }
  116.  
  117.     if (format < 1 || format > 6)
  118.     {
  119.         arg = getenv ("BKTR_FORMAT");
  120.         if (arg)
  121.             format = atoi (arg);
  122.         if (format < 1 || format > 6)
  123.             format = VIDEO_FORMAT;
  124.     }
  125.  
  126.     if (frequency <= 0)
  127.     {
  128.         arg = getenv ("BKTR_FREQUENCY");
  129.         if (arg)
  130.             frequency = atof (arg);
  131.         if (frequency <= 0)
  132.             frequency = 0.0;
  133.     }
  134.  
  135.     sigemptyset(&act.sa_mask);
  136.     act.sa_handler = catchsignal;
  137.     sigaction(SIGUSR1, &act, &old);
  138.  
  139.     *tuner_fd = avpriv_open("/dev/tuner0", O_RDONLY);
  140.     if (*tuner_fd < 0)
  141.         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
  142.  
  143.     *video_fd = avpriv_open(video_device, O_RDONLY);
  144.     if (*video_fd < 0) {
  145.         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
  146.         return -1;
  147.     }
  148.  
  149.     geo.rows = height;
  150.     geo.columns = width;
  151.     geo.frames = 1;
  152.     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
  153.  
  154.     switch (format) {
  155.     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
  156.     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
  157.     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
  158.     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
  159.     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
  160.     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
  161.     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
  162.     }
  163.  
  164.     if (height <= h_max / 2)
  165.         geo.oformat |= METEOR_GEO_EVEN_ONLY;
  166.  
  167.     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
  168.         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
  169.         return -1;
  170.     }
  171.  
  172.     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
  173.         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
  174.         return -1;
  175.     }
  176.  
  177.     c = bktr_dev[idev];
  178.     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
  179.         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
  180.         return -1;
  181.     }
  182.  
  183.     video_buf_size = width * height * 12 / 8;
  184.  
  185.     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
  186.         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
  187.     if (video_buf == MAP_FAILED) {
  188.         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
  189.         return -1;
  190.     }
  191.  
  192.     if (frequency != 0.0) {
  193.         ioctl_frequency  = (unsigned long)(frequency*16);
  194.         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
  195.             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
  196.     }
  197.  
  198.     c = AUDIO_UNMUTE;
  199.     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
  200.         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
  201.  
  202.     c = METEOR_CAP_CONTINOUS;
  203.     ioctl(*video_fd, METEORCAPTUR, &c);
  204.  
  205.     c = SIGUSR1;
  206.     ioctl(*video_fd, METEORSSIGNAL, &c);
  207.  
  208.     return 0;
  209. }
  210.  
  211. static void bktr_getframe(uint64_t per_frame)
  212. {
  213.     uint64_t curtime;
  214.  
  215.     curtime = av_gettime();
  216.     if (!last_frame_time
  217.         || ((last_frame_time + per_frame) > curtime)) {
  218.         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
  219.             if (!nsignals)
  220.                 av_log(NULL, AV_LOG_INFO,
  221.                        "SLEPT NO signals - %d microseconds late\n",
  222.                        (int)(av_gettime() - last_frame_time - per_frame));
  223.         }
  224.     }
  225.     nsignals = 0;
  226.     last_frame_time = curtime;
  227. }
  228.  
  229.  
  230. /* note: we support only one picture read at a time */
  231. static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
  232. {
  233.     VideoData *s = s1->priv_data;
  234.  
  235.     if (av_new_packet(pkt, video_buf_size) < 0)
  236.         return AVERROR(EIO);
  237.  
  238.     bktr_getframe(s->per_frame);
  239.  
  240.     pkt->pts = av_gettime();
  241.     memcpy(pkt->data, video_buf, video_buf_size);
  242.  
  243.     return video_buf_size;
  244. }
  245.  
  246. static int grab_read_header(AVFormatContext *s1)
  247. {
  248.     VideoData *s = s1->priv_data;
  249.     AVStream *st;
  250.     AVRational framerate;
  251.     int ret = 0;
  252.  
  253.     if (!s->framerate)
  254.         switch (s->standard) {
  255.         case PAL:   s->framerate = av_strdup("pal");  break;
  256.         case NTSC:  s->framerate = av_strdup("ntsc"); break;
  257.         case SECAM: s->framerate = av_strdup("25");   break;
  258.         default:
  259.             av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
  260.             ret = AVERROR(EINVAL);
  261.             goto out;
  262.         }
  263.     if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
  264.         av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
  265.         goto out;
  266.     }
  267.  
  268.     st = avformat_new_stream(s1, NULL);
  269.     if (!st) {
  270.         ret = AVERROR(ENOMEM);
  271.         goto out;
  272.     }
  273.     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
  274.  
  275.     s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
  276.  
  277.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  278.     st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
  279.     st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
  280.     st->codec->width = s->width;
  281.     st->codec->height = s->height;
  282.     st->codec->time_base.den = framerate.num;
  283.     st->codec->time_base.num = framerate.den;
  284.  
  285.  
  286.     if (bktr_init(s1->filename, s->width, s->height, s->standard,
  287.                   &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
  288.         ret = AVERROR(EIO);
  289.         goto out;
  290.     }
  291.  
  292.     nsignals = 0;
  293.     last_frame_time = 0;
  294.  
  295. out:
  296.     return ret;
  297. }
  298.  
  299. static int grab_read_close(AVFormatContext *s1)
  300. {
  301.     VideoData *s = s1->priv_data;
  302.     int c;
  303.  
  304.     c = METEOR_CAP_STOP_CONT;
  305.     ioctl(s->video_fd, METEORCAPTUR, &c);
  306.     close(s->video_fd);
  307.  
  308.     c = AUDIO_MUTE;
  309.     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
  310.     close(s->tuner_fd);
  311.  
  312.     munmap((caddr_t)video_buf, video_buf_size);
  313.  
  314.     return 0;
  315. }
  316.  
  317. #define OFFSET(x) offsetof(VideoData, x)
  318. #define DEC AV_OPT_FLAG_DECODING_PARAM
  319. static const AVOption options[] = {
  320.     { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  321.     { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  322.     { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  323.     { "SECAM",    "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  324.     { "PALN",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  325.     { "PALM",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  326.     { "NTSCJ",    "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
  327.     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
  328.     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
  329.     { NULL },
  330. };
  331.  
  332. static const AVClass bktr_class = {
  333.     .class_name = "BKTR grab interface",
  334.     .item_name  = av_default_item_name,
  335.     .option     = options,
  336.     .version    = LIBAVUTIL_VERSION_INT,
  337. };
  338.  
  339. AVInputFormat ff_bktr_demuxer = {
  340.     .name           = "bktr",
  341.     .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
  342.     .priv_data_size = sizeof(VideoData),
  343.     .read_header    = grab_read_header,
  344.     .read_packet    = grab_read_packet,
  345.     .read_close     = grab_read_close,
  346.     .flags          = AVFMT_NOFILE,
  347.     .priv_class     = &bktr_class,
  348. };
  349.