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