ffmpeg/libavdevice/bktr.c

   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 Fabrice Bellard
   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 VideoData {
  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 const 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     .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
 338 };
 339
 340 AVInputFormat ff_bktr_demuxer = {
 341     .name           = "bktr",
 342     .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
 343     .priv_data_size = sizeof(VideoData),
 344     .read_header    = grab_read_header,
 345     .read_packet    = grab_read_packet,
 346     .read_close     = grab_read_close,
 347     .flags          = AVFMT_NOFILE,
 348     .priv_class     = &bktr_class,
 349 };