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_BKTR_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 #include <strings.h>
  48
  49 typedef struct {
  50     int video_fd;
  51     int tuner_fd;
  52     int width, height;
  53     int frame_rate;
  54     int frame_rate_base;
  55     u_int64_t per_frame;
  56 } VideoData;
  57
  58
  59 #define PAL 1
  60 #define PALBDGHI 1
  61 #define NTSC 2
  62 #define NTSCM 2
  63 #define SECAM 3
  64 #define PALN 4
  65 #define PALM 5
  66 #define NTSCJ 6
  67
  68 /* PAL is 768 x 576. NTSC is 640 x 480 */
  69 #define PAL_HEIGHT 576
  70 #define SECAM_HEIGHT 576
  71 #define NTSC_HEIGHT 480
  72
  73 #ifndef VIDEO_FORMAT
  74 #define VIDEO_FORMAT NTSC
  75 #endif
  76
  77 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
  78     METEOR_DEV3, METEOR_DEV_SVIDEO };
  79
  80 uint8_t *video_buf;
  81 size_t video_buf_size;
  82 u_int64_t last_frame_time;
  83 volatile sig_atomic_t nsignals;
  84
  85
  86 static void catchsignal(int signal)
  87 {
  88     nsignals++;
  89     return;
  90 }
  91
  92 static int bktr_init(const char *video_device, int width, int height,
  93     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
  94 {
  95     struct meteor_geomet geo;
  96     int h_max;
  97     long ioctl_frequency;
  98     char *arg;
  99     int c;
 100     struct sigaction act, old;
 101
 102     if (idev < 0 || idev > 4)
 103     {
 104         arg = getenv ("BKTR_DEV");
 105         if (arg)
 106             idev = atoi (arg);
 107         if (idev < 0 || idev > 4)
 108             idev = 1;
 109     }
 110
 111     if (format < 1 || format > 6)
 112     {
 113         arg = getenv ("BKTR_FORMAT");
 114         if (arg)
 115             format = atoi (arg);
 116         if (format < 1 || format > 6)
 117             format = VIDEO_FORMAT;
 118     }
 119
 120     if (frequency <= 0)
 121     {
 122         arg = getenv ("BKTR_FREQUENCY");
 123         if (arg)
 124             frequency = atof (arg);
 125         if (frequency <= 0)
 126             frequency = 0.0;
 127     }
 128
 129     memset(&act, 0, sizeof(act));
 130     sigemptyset(&act.sa_mask);
 131     act.sa_handler = catchsignal;
 132     sigaction(SIGUSR1, &act, &old);
 133
 134     *tuner_fd = open("/dev/tuner0", O_RDONLY);
 135     if (*tuner_fd < 0)
 136         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
 137
 138     *video_fd = open(video_device, O_RDONLY);
 139     if (*video_fd < 0) {
 140         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
 141         return -1;
 142     }
 143
 144     geo.rows = height;
 145     geo.columns = width;
 146     geo.frames = 1;
 147     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
 148
 149     switch (format) {
 150     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
 151     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
 152     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
 153     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
 154     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
 155     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
 156     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
 157     }
 158
 159     if (height <= h_max / 2)
 160         geo.oformat |= METEOR_GEO_EVEN_ONLY;
 161
 162     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
 163         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
 164         return -1;
 165     }
 166
 167     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
 168         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
 169         return -1;
 170     }
 171
 172     c = bktr_dev[idev];
 173     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
 174         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
 175         return -1;
 176     }
 177
 178     video_buf_size = width * height * 12 / 8;
 179
 180     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
 181         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
 182     if (video_buf == MAP_FAILED) {
 183         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
 184         return -1;
 185     }
 186
 187     if (frequency != 0.0) {
 188         ioctl_frequency  = (unsigned long)(frequency*16);
 189         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
 190             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
 191     }
 192
 193     c = AUDIO_UNMUTE;
 194     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
 195         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
 196
 197     c = METEOR_CAP_CONTINOUS;
 198     ioctl(*video_fd, METEORCAPTUR, &c);
 199
 200     c = SIGUSR1;
 201     ioctl(*video_fd, METEORSSIGNAL, &c);
 202
 203     return 0;
 204 }
 205
 206 static void bktr_getframe(u_int64_t per_frame)
 207 {
 208     u_int64_t curtime;
 209
 210     curtime = av_gettime();
 211     if (!last_frame_time
 212         || ((last_frame_time + per_frame) > curtime)) {
 213         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
 214             if (!nsignals)
 215                 av_log(NULL, AV_LOG_INFO,
 216                        "SLEPT NO signals - %d microseconds late\n",
 217                        (int)(av_gettime() - last_frame_time - per_frame));
 218         }
 219     }
 220     nsignals = 0;
 221     last_frame_time = curtime;
 222 }
 223
 224
 225 /* note: we support only one picture read at a time */
 226 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
 227 {
 228     VideoData *s = s1->priv_data;
 229
 230     if (av_new_packet(pkt, video_buf_size) < 0)
 231         return AVERROR(EIO);
 232
 233     bktr_getframe(s->per_frame);
 234
 235     pkt->pts = av_gettime();
 236     memcpy(pkt->data, video_buf, video_buf_size);
 237
 238     return video_buf_size;
 239 }
 240
 241 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
 242 {
 243     VideoData *s = s1->priv_data;
 244     AVStream *st;
 245     int width, height;
 246     int frame_rate;
 247     int frame_rate_base;
 248     int format = -1;
 249
 250     if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
 251         return -1;
 252
 253     width = ap->width;
 254     height = ap->height;
 255     frame_rate = ap->time_base.den;
 256     frame_rate_base = ap->time_base.num;
 257
 258     st = av_new_stream(s1, 0);
 259     if (!st)
 260         return AVERROR(ENOMEM);
 261     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
 262
 263     s->width = width;
 264     s->height = height;
 265     s->frame_rate = frame_rate;
 266     s->frame_rate_base = frame_rate_base;
 267     s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
 268
 269     st->codec->codec_type = CODEC_TYPE_VIDEO;
 270     st->codec->pix_fmt = PIX_FMT_YUV420P;
 271     st->codec->codec_id = CODEC_ID_RAWVIDEO;
 272     st->codec->width = width;
 273     st->codec->height = height;
 274     st->codec->time_base.den = frame_rate;
 275     st->codec->time_base.num = frame_rate_base;
 276
 277     if (ap->standard) {
 278         if (!strcasecmp(ap->standard, "pal"))
 279             format = PAL;
 280         else if (!strcasecmp(ap->standard, "secam"))
 281             format = SECAM;
 282         else if (!strcasecmp(ap->standard, "ntsc"))
 283             format = NTSC;
 284     }
 285
 286     if (bktr_init(s1->filename, width, height, format,
 287             &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
 288         return AVERROR(EIO);
 289
 290     nsignals = 0;
 291     last_frame_time = 0;
 292
 293     return 0;
 294 }
 295
 296 static int grab_read_close(AVFormatContext *s1)
 297 {
 298     VideoData *s = s1->priv_data;
 299     int c;
 300
 301     c = METEOR_CAP_STOP_CONT;
 302     ioctl(s->video_fd, METEORCAPTUR, &c);
 303     close(s->video_fd);
 304
 305     c = AUDIO_MUTE;
 306     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
 307     close(s->tuner_fd);
 308
 309     munmap((caddr_t)video_buf, video_buf_size);
 310
 311     return 0;
 312 }
 313
 314 AVInputFormat bktr_demuxer = {
 315     "bktr",
 316     NULL_IF_CONFIG_SMALL("video grab"),
 317     sizeof(VideoData),
 318     NULL,
 319     grab_read_header,
 320     grab_read_packet,
 321     grab_read_close,
 322     .flags = AVFMT_NOFILE,
 323 };