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 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 #define _BSD_SOURCE 1
  28 #include "libavformat/avformat.h"
  29 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
  30 # include <dev/bktr/ioctl_meteor.h>
  31 # include <dev/bktr/ioctl_bt848.h>
  32 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
  33 # include <machine/ioctl_meteor.h>
  34 # include <machine/ioctl_bt848.h>
  35 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_METEOR_IOCTL_BT848_H
  36 # include <dev/video/meteor/ioctl_meteor.h>
  37 # include <dev/video/bktr/ioctl_bt848.h>
  38 #elif HAVE_DEV_IC_BT8XX_H
  39 # include <dev/ic/bt8xx.h>
  40 #endif
  41 #include <unistd.h>
  42 #include <fcntl.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/mman.h>
  45 #include <sys/time.h>
  46 #include <signal.h>
  47
  48 typedef struct {
  49     int video_fd;
  50     int tuner_fd;
  51     int width, height;
  52     int frame_rate;
  53     int frame_rate_base;
  54     u_int64_t per_frame;
  55 } VideoData;
  56
  57
  58 #define PAL 1
  59 #define PALBDGHI 1
  60 #define NTSC 2
  61 #define NTSCM 2
  62 #define SECAM 3
  63 #define PALN 4
  64 #define PALM 5
  65 #define NTSCJ 6
  66
  67 /* PAL is 768 x 576. NTSC is 640 x 480 */
  68 #define PAL_HEIGHT 576
  69 #define SECAM_HEIGHT 576
  70 #define NTSC_HEIGHT 480
  71
  72 #ifndef VIDEO_FORMAT
  73 #define VIDEO_FORMAT NTSC
  74 #endif
  75
  76 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
  77     METEOR_DEV3, METEOR_DEV_SVIDEO };
  78
  79 uint8_t *video_buf;
  80 size_t video_buf_size;
  81 u_int64_t last_frame_time;
  82 volatile sig_atomic_t nsignals;
  83
  84
  85 static void catchsignal(int signal)
  86 {
  87     nsignals++;
  88     return;
  89 }
  90
  91 static int bktr_init(const char *video_device, int width, int height,
  92     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
  93 {
  94     struct meteor_geomet geo;
  95     int h_max;
  96     long ioctl_frequency;
  97     char *arg;
  98     int c;
  99     struct sigaction act, old;
 100
 101     if (idev < 0 || idev > 4)
 102     {
 103         arg = getenv ("BKTR_DEV");
 104         if (arg)
 105             idev = atoi (arg);
 106         if (idev < 0 || idev > 4)
 107             idev = 1;
 108     }
 109
 110     if (format < 1 || format > 6)
 111     {
 112         arg = getenv ("BKTR_FORMAT");
 113         if (arg)
 114             format = atoi (arg);
 115         if (format < 1 || format > 6)
 116             format = VIDEO_FORMAT;
 117     }
 118
 119     if (frequency <= 0)
 120     {
 121         arg = getenv ("BKTR_FREQUENCY");
 122         if (arg)
 123             frequency = atof (arg);
 124         if (frequency <= 0)
 125             frequency = 0.0;
 126     }
 127
 128     memset(&act, 0, sizeof(act));
 129     sigemptyset(&act.sa_mask);
 130     act.sa_handler = catchsignal;
 131     sigaction(SIGUSR1, &act, &old);
 132
 133     *tuner_fd = open("/dev/tuner0", O_RDONLY);
 134     if (*tuner_fd < 0)
 135         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
 136
 137     *video_fd = open(video_device, O_RDONLY);
 138     if (*video_fd < 0) {
 139         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
 140         return -1;
 141     }
 142
 143     geo.rows = height;
 144     geo.columns = width;
 145     geo.frames = 1;
 146     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
 147
 148     switch (format) {
 149     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
 150     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
 151     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
 152     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
 153     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
 154     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
 155     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
 156     }
 157
 158     if (height <= h_max / 2)
 159         geo.oformat |= METEOR_GEO_EVEN_ONLY;
 160
 161     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
 162         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
 163         return -1;
 164     }
 165
 166     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
 167         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
 168         return -1;
 169     }
 170
 171     c = bktr_dev[idev];
 172     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
 173         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
 174         return -1;
 175     }
 176
 177     video_buf_size = width * height * 12 / 8;
 178
 179     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
 180         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
 181     if (video_buf == MAP_FAILED) {
 182         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
 183         return -1;
 184     }
 185
 186     if (frequency != 0.0) {
 187         ioctl_frequency  = (unsigned long)(frequency*16);
 188         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
 189             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
 190     }
 191
 192     c = AUDIO_UNMUTE;
 193     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
 194         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
 195
 196     c = METEOR_CAP_CONTINOUS;
 197     ioctl(*video_fd, METEORCAPTUR, &c);
 198
 199     c = SIGUSR1;
 200     ioctl(*video_fd, METEORSSIGNAL, &c);
 201
 202     return 0;
 203 }
 204
 205 static void bktr_getframe(u_int64_t per_frame)
 206 {
 207     u_int64_t curtime;
 208
 209     curtime = av_gettime();
 210     if (!last_frame_time
 211         || ((last_frame_time + per_frame) > curtime)) {
 212         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
 213             if (!nsignals)
 214                 av_log(NULL, AV_LOG_INFO,
 215                        "SLEPT NO signals - %d microseconds late\n",
 216                        (int)(av_gettime() - last_frame_time - per_frame));
 217         }
 218     }
 219     nsignals = 0;
 220     last_frame_time = curtime;
 221 }
 222
 223
 224 /* note: we support only one picture read at a time */
 225 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
 226 {
 227     VideoData *s = s1->priv_data;
 228
 229     if (av_new_packet(pkt, video_buf_size) < 0)
 230         return AVERROR(EIO);
 231
 232     bktr_getframe(s->per_frame);
 233
 234     pkt->pts = av_gettime();
 235     memcpy(pkt->data, video_buf, video_buf_size);
 236
 237     return video_buf_size;
 238 }
 239
 240 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
 241 {
 242     VideoData *s = s1->priv_data;
 243     AVStream *st;
 244     int width, height;
 245     int frame_rate;
 246     int frame_rate_base;
 247     int format = -1;
 248
 249     if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
 250         return -1;
 251
 252     width = ap->width;
 253     height = ap->height;
 254     frame_rate = ap->time_base.den;
 255     frame_rate_base = ap->time_base.num;
 256
 257     st = av_new_stream(s1, 0);
 258     if (!st)
 259         return AVERROR(ENOMEM);
 260     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
 261
 262     s->width = width;
 263     s->height = height;
 264     s->frame_rate = frame_rate;
 265     s->frame_rate_base = frame_rate_base;
 266     s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
 267
 268     st->codec->codec_type = CODEC_TYPE_VIDEO;
 269     st->codec->pix_fmt = PIX_FMT_YUV420P;
 270     st->codec->codec_id = CODEC_ID_RAWVIDEO;
 271     st->codec->width = width;
 272     st->codec->height = height;
 273     st->codec->time_base.den = frame_rate;
 274     st->codec->time_base.num = frame_rate_base;
 275
 276     if (ap->standard) {
 277         if (!strcasecmp(ap->standard, "pal"))
 278             format = PAL;
 279         else if (!strcasecmp(ap->standard, "secam"))
 280             format = SECAM;
 281         else if (!strcasecmp(ap->standard, "ntsc"))
 282             format = NTSC;
 283     }
 284
 285     if (bktr_init(s1->filename, width, height, format,
 286             &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
 287         return AVERROR(EIO);
 288
 289     nsignals = 0;
 290     last_frame_time = 0;
 291
 292     return 0;
 293 }
 294
 295 static int grab_read_close(AVFormatContext *s1)
 296 {
 297     VideoData *s = s1->priv_data;
 298     int c;
 299
 300     c = METEOR_CAP_STOP_CONT;
 301     ioctl(s->video_fd, METEORCAPTUR, &c);
 302     close(s->video_fd);
 303
 304     c = AUDIO_MUTE;
 305     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
 306     close(s->tuner_fd);
 307
 308     munmap((caddr_t)video_buf, video_buf_size);
 309
 310     return 0;
 311 }
 312
 313 AVInputFormat bktr_demuxer = {
 314     "bktr",
 315     NULL_IF_CONFIG_SMALL("video grab"),
 316     sizeof(VideoData),
 317     NULL,
 318     grab_read_header,
 319     grab_read_packet,
 320     grab_read_close,
 321     .flags = AVFMT_NOFILE,
 322 };