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libavdevice/bktr.c

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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 #define _BSD_SOURCE 1
00028 #include "libavformat/avformat.h"
00029 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
00030 # include <dev/bktr/ioctl_meteor.h>
00031 # include <dev/bktr/ioctl_bt848.h>
00032 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
00033 # include <machine/ioctl_meteor.h>
00034 # include <machine/ioctl_bt848.h>
00035 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_METEOR_IOCTL_BT848_H
00036 # include <dev/video/meteor/ioctl_meteor.h>
00037 # include <dev/video/bktr/ioctl_bt848.h>
00038 #elif HAVE_DEV_IC_BT8XX_H
00039 # include <dev/ic/bt8xx.h>
00040 #endif
00041 #include <unistd.h>
00042 #include <fcntl.h>
00043 #include <sys/ioctl.h>
00044 #include <sys/mman.h>
00045 #include <sys/time.h>
00046 #include <signal.h>
00047 
00048 typedef struct {
00049     int video_fd;
00050     int tuner_fd;
00051     int width, height;
00052     int frame_rate;
00053     int frame_rate_base;
00054     u_int64_t per_frame;
00055 } VideoData;
00056 
00057 
00058 #define PAL 1
00059 #define PALBDGHI 1
00060 #define NTSC 2
00061 #define NTSCM 2
00062 #define SECAM 3
00063 #define PALN 4
00064 #define PALM 5
00065 #define NTSCJ 6
00066 
00067 /* PAL is 768 x 576. NTSC is 640 x 480 */
00068 #define PAL_HEIGHT 576
00069 #define SECAM_HEIGHT 576
00070 #define NTSC_HEIGHT 480
00071 
00072 #ifndef VIDEO_FORMAT
00073 #define VIDEO_FORMAT NTSC
00074 #endif
00075 
00076 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
00077     METEOR_DEV3, METEOR_DEV_SVIDEO };
00078 
00079 uint8_t *video_buf;
00080 size_t video_buf_size;
00081 u_int64_t last_frame_time;
00082 volatile sig_atomic_t nsignals;
00083 
00084 
00085 static void catchsignal(int signal)
00086 {
00087     nsignals++;
00088     return;
00089 }
00090 
00091 static int bktr_init(const char *video_device, int width, int height,
00092     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
00093 {
00094     struct meteor_geomet geo;
00095     int h_max;
00096     long ioctl_frequency;
00097     char *arg;
00098     int c;
00099     struct sigaction act, old;
00100 
00101     if (idev < 0 || idev > 4)
00102     {
00103         arg = getenv ("BKTR_DEV");
00104         if (arg)
00105             idev = atoi (arg);
00106         if (idev < 0 || idev > 4)
00107             idev = 1;
00108     }
00109 
00110     if (format < 1 || format > 6)
00111     {
00112         arg = getenv ("BKTR_FORMAT");
00113         if (arg)
00114             format = atoi (arg);
00115         if (format < 1 || format > 6)
00116             format = VIDEO_FORMAT;
00117     }
00118 
00119     if (frequency <= 0)
00120     {
00121         arg = getenv ("BKTR_FREQUENCY");
00122         if (arg)
00123             frequency = atof (arg);
00124         if (frequency <= 0)
00125             frequency = 0.0;
00126     }
00127 
00128     memset(&act, 0, sizeof(act));
00129     sigemptyset(&act.sa_mask);
00130     act.sa_handler = catchsignal;
00131     sigaction(SIGUSR1, &act, &old);
00132 
00133     *tuner_fd = open("/dev/tuner0", O_RDONLY);
00134     if (*tuner_fd < 0)
00135         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
00136 
00137     *video_fd = open(video_device, O_RDONLY);
00138     if (*video_fd < 0) {
00139         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
00140         return -1;
00141     }
00142 
00143     geo.rows = height;
00144     geo.columns = width;
00145     geo.frames = 1;
00146     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
00147 
00148     switch (format) {
00149     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00150     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
00151     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
00152     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
00153     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
00154     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
00155     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00156     }
00157 
00158     if (height <= h_max / 2)
00159         geo.oformat |= METEOR_GEO_EVEN_ONLY;
00160 
00161     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
00162         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
00163         return -1;
00164     }
00165 
00166     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
00167         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
00168         return -1;
00169     }
00170 
00171     c = bktr_dev[idev];
00172     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
00173         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
00174         return -1;
00175     }
00176 
00177     video_buf_size = width * height * 12 / 8;
00178 
00179     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
00180         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
00181     if (video_buf == MAP_FAILED) {
00182         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
00183         return -1;
00184     }
00185 
00186     if (frequency != 0.0) {
00187         ioctl_frequency  = (unsigned long)(frequency*16);
00188         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
00189             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
00190     }
00191 
00192     c = AUDIO_UNMUTE;
00193     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
00194         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
00195 
00196     c = METEOR_CAP_CONTINOUS;
00197     ioctl(*video_fd, METEORCAPTUR, &c);
00198 
00199     c = SIGUSR1;
00200     ioctl(*video_fd, METEORSSIGNAL, &c);
00201 
00202     return 0;
00203 }
00204 
00205 static void bktr_getframe(u_int64_t per_frame)
00206 {
00207     u_int64_t curtime;
00208 
00209     curtime = av_gettime();
00210     if (!last_frame_time
00211         || ((last_frame_time + per_frame) > curtime)) {
00212         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
00213             if (!nsignals)
00214                 av_log(NULL, AV_LOG_INFO,
00215                        "SLEPT NO signals - %d microseconds late\n",
00216                        (int)(av_gettime() - last_frame_time - per_frame));
00217         }
00218     }
00219     nsignals = 0;
00220     last_frame_time = curtime;
00221 }
00222 
00223 
00224 /* note: we support only one picture read at a time */
00225 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
00226 {
00227     VideoData *s = s1->priv_data;
00228 
00229     if (av_new_packet(pkt, video_buf_size) < 0)
00230         return AVERROR(EIO);
00231 
00232     bktr_getframe(s->per_frame);
00233 
00234     pkt->pts = av_gettime();
00235     memcpy(pkt->data, video_buf, video_buf_size);
00236 
00237     return video_buf_size;
00238 }
00239 
00240 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
00241 {
00242     VideoData *s = s1->priv_data;
00243     AVStream *st;
00244     int width, height;
00245     int frame_rate;
00246     int frame_rate_base;
00247     int format = -1;
00248 
00249     if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
00250         return -1;
00251 
00252     width = ap->width;
00253     height = ap->height;
00254     frame_rate = ap->time_base.den;
00255     frame_rate_base = ap->time_base.num;
00256 
00257     st = av_new_stream(s1, 0);
00258     if (!st)
00259         return AVERROR(ENOMEM);
00260     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
00261 
00262     s->width = width;
00263     s->height = height;
00264     s->frame_rate = frame_rate;
00265     s->frame_rate_base = frame_rate_base;
00266     s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
00267 
00268     st->codec->codec_type = CODEC_TYPE_VIDEO;
00269     st->codec->pix_fmt = PIX_FMT_YUV420P;
00270     st->codec->codec_id = CODEC_ID_RAWVIDEO;
00271     st->codec->width = width;
00272     st->codec->height = height;
00273     st->codec->time_base.den = frame_rate;
00274     st->codec->time_base.num = frame_rate_base;
00275 
00276     if (ap->standard) {
00277         if (!strcasecmp(ap->standard, "pal"))
00278             format = PAL;
00279         else if (!strcasecmp(ap->standard, "secam"))
00280             format = SECAM;
00281         else if (!strcasecmp(ap->standard, "ntsc"))
00282             format = NTSC;
00283     }
00284 
00285     if (bktr_init(s1->filename, width, height, format,
00286             &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
00287         return AVERROR(EIO);
00288 
00289     nsignals = 0;
00290     last_frame_time = 0;
00291 
00292     return 0;
00293 }
00294 
00295 static int grab_read_close(AVFormatContext *s1)
00296 {
00297     VideoData *s = s1->priv_data;
00298     int c;
00299 
00300     c = METEOR_CAP_STOP_CONT;
00301     ioctl(s->video_fd, METEORCAPTUR, &c);
00302     close(s->video_fd);
00303 
00304     c = AUDIO_MUTE;
00305     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
00306     close(s->tuner_fd);
00307 
00308     munmap((caddr_t)video_buf, video_buf_size);
00309 
00310     return 0;
00311 }
00312 
00313 AVInputFormat bktr_demuxer = {
00314     "bktr",
00315     NULL_IF_CONFIG_SMALL("video grab"),
00316     sizeof(VideoData),
00317     NULL,
00318     grab_read_header,
00319     grab_read_packet,
00320     grab_read_close,
00321     .flags = AVFMT_NOFILE,
00322 };

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