FFmpeg: libavdevice/bktr.c Source File

00001 /*
00002  * *BSD video grab interface
00003  * Copyright (c) 2002 Steve O'Hara-Smith
00004  * based on
00005  *           Linux video grab interface
00006  *           Copyright (c) 2000,2001 Gerard Lantau
00007  * and
00008  *           simple_grab.c Copyright (c) 1999 Roger Hardiman
00009  *
00010  * This file is part of FFmpeg.
00011  *
00012  * FFmpeg is free software; you can redistribute it and/or
00013  * modify it under the terms of the GNU Lesser General Public
00014  * License as published by the Free Software Foundation; either
00015  * version 2.1 of the License, or (at your option) any later version.
00016  *
00017  * FFmpeg is distributed in the hope that it will be useful,
00018  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00019  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020  * Lesser General Public License for more details.
00021  *
00022  * You should have received a copy of the GNU Lesser General Public
00023  * License along with FFmpeg; if not, write to the Free Software
00024  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00025  */
00026 
00027 #include "libavformat/internal.h"
00028 #include "libavutil/log.h"
00029 #include "libavutil/opt.h"
00030 #include "libavutil/parseutils.h"
00031 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
00032 # include <dev/bktr/ioctl_meteor.h>
00033 # include <dev/bktr/ioctl_bt848.h>
00034 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
00035 # include <machine/ioctl_meteor.h>
00036 # include <machine/ioctl_bt848.h>
00037 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
00038 # include <dev/video/meteor/ioctl_meteor.h>
00039 # include <dev/video/bktr/ioctl_bt848.h>
00040 #elif HAVE_DEV_IC_BT8XX_H
00041 # include <dev/ic/bt8xx.h>
00042 #endif
00043 #include <unistd.h>
00044 #include <fcntl.h>
00045 #include <sys/ioctl.h>
00046 #include <sys/mman.h>
00047 #include <sys/time.h>
00048 #include <signal.h>
00049 #include <stdint.h>
00050 #include "avdevice.h"
00051 
00052 typedef struct {
00053     AVClass *class;
00054     int video_fd;
00055     int tuner_fd;
00056     int width, height;
00057     uint64_t per_frame;
00058     int standard;
00059     char *video_size; 
00060     char *framerate;  
00061 } VideoData;
00062 
00063 
00064 #define PAL 1
00065 #define PALBDGHI 1
00066 #define NTSC 2
00067 #define NTSCM 2
00068 #define SECAM 3
00069 #define PALN 4
00070 #define PALM 5
00071 #define NTSCJ 6
00072 
00073 /* PAL is 768 x 576. NTSC is 640 x 480 */
00074 #define PAL_HEIGHT 576
00075 #define SECAM_HEIGHT 576
00076 #define NTSC_HEIGHT 480
00077 
00078 #ifndef VIDEO_FORMAT
00079 #define VIDEO_FORMAT NTSC
00080 #endif
00081 
00082 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
00083     METEOR_DEV3, METEOR_DEV_SVIDEO };
00084 
00085 uint8_t *video_buf;
00086 size_t video_buf_size;
00087 uint64_t last_frame_time;
00088 volatile sig_atomic_t nsignals;
00089 
00090 
00091 static void catchsignal(int signal)
00092 {
00093     nsignals++;
00094     return;
00095 }
00096 
00097 static av_cold int bktr_init(const char *video_device, int width, int height,
00098     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
00099 {
00100     struct meteor_geomet geo;
00101     int h_max;
00102     long ioctl_frequency;
00103     char *arg;
00104     int c;
00105     struct sigaction act, old;
00106 
00107     if (idev < 0 || idev > 4)
00108     {
00109         arg = getenv ("BKTR_DEV");
00110         if (arg)
00111             idev = atoi (arg);
00112         if (idev < 0 || idev > 4)
00113             idev = 1;
00114     }
00115 
00116     if (format < 1 || format > 6)
00117     {
00118         arg = getenv ("BKTR_FORMAT");
00119         if (arg)
00120             format = atoi (arg);
00121         if (format < 1 || format > 6)
00122             format = VIDEO_FORMAT;
00123     }
00124 
00125     if (frequency <= 0)
00126     {
00127         arg = getenv ("BKTR_FREQUENCY");
00128         if (arg)
00129             frequency = atof (arg);
00130         if (frequency <= 0)
00131             frequency = 0.0;
00132     }
00133 
00134     memset(&act, 0, sizeof(act));
00135     sigemptyset(&act.sa_mask);
00136     act.sa_handler = catchsignal;
00137     sigaction(SIGUSR1, &act, &old);
00138 
00139     *tuner_fd = open("/dev/tuner0", O_RDONLY);
00140     if (*tuner_fd < 0)
00141         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
00142 
00143     *video_fd = open(video_device, O_RDONLY);
00144     if (*video_fd < 0) {
00145         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
00146         return -1;
00147     }
00148 
00149     geo.rows = height;
00150     geo.columns = width;
00151     geo.frames = 1;
00152     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
00153 
00154     switch (format) {
00155     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00156     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
00157     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
00158     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
00159     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
00160     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
00161     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00162     }
00163 
00164     if (height <= h_max / 2)
00165         geo.oformat |= METEOR_GEO_EVEN_ONLY;
00166 
00167     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
00168         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
00169         return -1;
00170     }
00171 
00172     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
00173         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
00174         return -1;
00175     }
00176 
00177     c = bktr_dev[idev];
00178     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
00179         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
00180         return -1;
00181     }
00182 
00183     video_buf_size = width * height * 12 / 8;
00184 
00185     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
00186         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
00187     if (video_buf == MAP_FAILED) {
00188         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
00189         return -1;
00190     }
00191 
00192     if (frequency != 0.0) {
00193         ioctl_frequency  = (unsigned long)(frequency*16);
00194         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
00195             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
00196     }
00197 
00198     c = AUDIO_UNMUTE;
00199     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
00200         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
00201 
00202     c = METEOR_CAP_CONTINOUS;
00203     ioctl(*video_fd, METEORCAPTUR, &c);
00204 
00205     c = SIGUSR1;
00206     ioctl(*video_fd, METEORSSIGNAL, &c);
00207 
00208     return 0;
00209 }
00210 
00211 static void bktr_getframe(uint64_t per_frame)
00212 {
00213     uint64_t curtime;
00214 
00215     curtime = av_gettime();
00216     if (!last_frame_time
00217         || ((last_frame_time + per_frame) > curtime)) {
00218         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
00219             if (!nsignals)
00220                 av_log(NULL, AV_LOG_INFO,
00221                        "SLEPT NO signals - %d microseconds late\n",
00222                        (int)(av_gettime() - last_frame_time - per_frame));
00223         }
00224     }
00225     nsignals = 0;
00226     last_frame_time = curtime;
00227 }
00228 
00229 
00230 /* note: we support only one picture read at a time */
00231 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
00232 {
00233     VideoData *s = s1->priv_data;
00234 
00235     if (av_new_packet(pkt, video_buf_size) < 0)
00236         return AVERROR(EIO);
00237 
00238     bktr_getframe(s->per_frame);
00239 
00240     pkt->pts = av_gettime();
00241     memcpy(pkt->data, video_buf, video_buf_size);
00242 
00243     return video_buf_size;
00244 }
00245 
00246 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
00247 {
00248     VideoData *s = s1->priv_data;
00249     AVStream *st;
00250     int width, height;
00251     AVRational framerate;
00252     int ret = 0;
00253 
00254     if ((ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
00255         av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
00256         goto out;
00257     }
00258 
00259     if (!s->framerate)
00260         switch (s->standard) {
00261         case PAL:   s->framerate = av_strdup("pal");  break;
00262         case NTSC:  s->framerate = av_strdup("ntsc"); break;
00263         case SECAM: s->framerate = av_strdup("25");   break;
00264         default:
00265             av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
00266             ret = AVERROR(EINVAL);
00267             goto out;
00268         }
00269     if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
00270         av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
00271         goto out;
00272     }
00273 
00274     st = avformat_new_stream(s1, NULL);
00275     if (!st) {
00276         ret = AVERROR(ENOMEM);
00277         goto out;
00278     }
00279     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
00280 
00281     s->width = width;
00282     s->height = height;
00283     s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
00284 
00285     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00286     st->codec->pix_fmt = PIX_FMT_YUV420P;
00287     st->codec->codec_id = CODEC_ID_RAWVIDEO;
00288     st->codec->width = width;
00289     st->codec->height = height;
00290     st->codec->time_base.den = framerate.num;
00291     st->codec->time_base.num = framerate.den;
00292 
00293 
00294     if (bktr_init(s1->filename, width, height, s->standard,
00295             &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0) {
00296         ret = AVERROR(EIO);
00297         goto out;
00298     }
00299 
00300     nsignals = 0;
00301     last_frame_time = 0;
00302 
00303 out:
00304     return ret;
00305 }
00306 
00307 static int grab_read_close(AVFormatContext *s1)
00308 {
00309     VideoData *s = s1->priv_data;
00310     int c;
00311 
00312     c = METEOR_CAP_STOP_CONT;
00313     ioctl(s->video_fd, METEORCAPTUR, &c);
00314     close(s->video_fd);
00315 
00316     c = AUDIO_MUTE;
00317     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
00318     close(s->tuner_fd);
00319 
00320     munmap((caddr_t)video_buf, video_buf_size);
00321 
00322     return 0;
00323 }
00324 
00325 #define OFFSET(x) offsetof(VideoData, x)
00326 #define DEC AV_OPT_FLAG_DECODING_PARAM
00327 static const AVOption options[] = {
00328     { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.dbl = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00329     { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.dbl = PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00330     { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00331     { "SECAM",    "", 0, AV_OPT_TYPE_CONST, {.dbl = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00332     { "PALN",     "", 0, AV_OPT_TYPE_CONST, {.dbl = PALN},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00333     { "PALM",     "", 0, AV_OPT_TYPE_CONST, {.dbl = PALM},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00334     { "NTSCJ",    "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00335     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga"}, 0, 0, DEC },
00336     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
00337     { NULL },
00338 };
00339 
00340 static const AVClass bktr_class = {
00341     .class_name = "BKTR grab interface",
00342     .item_name  = av_default_item_name,
00343     .option     = options,
00344     .version    = LIBAVUTIL_VERSION_INT,
00345 };
00346 
00347 AVInputFormat ff_bktr_demuxer = {
00348     .name           = "bktr",
00349     .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
00350     .priv_data_size = sizeof(VideoData),
00351     .read_header    = grab_read_header,
00352     .read_packet    = grab_read_packet,
00353     .read_close     = grab_read_close,
00354     .flags          = AVFMT_NOFILE,
00355     .priv_class     = &bktr_class,
00356 };