• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavdevice/bktr.c

Go to the documentation of this 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 #define _BSD_SOURCE 1
00028 #define _NETBSD_SOURCE
00029 
00030 #include "libavformat/avformat.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 <strings.h>
00051 
00052 typedef struct {
00053     int video_fd;
00054     int tuner_fd;
00055     int width, height;
00056     int frame_rate;
00057     int frame_rate_base;
00058     uint64_t per_frame;
00059 } VideoData;
00060 
00061 
00062 #define PAL 1
00063 #define PALBDGHI 1
00064 #define NTSC 2
00065 #define NTSCM 2
00066 #define SECAM 3
00067 #define PALN 4
00068 #define PALM 5
00069 #define NTSCJ 6
00070 
00071 /* PAL is 768 x 576. NTSC is 640 x 480 */
00072 #define PAL_HEIGHT 576
00073 #define SECAM_HEIGHT 576
00074 #define NTSC_HEIGHT 480
00075 
00076 #ifndef VIDEO_FORMAT
00077 #define VIDEO_FORMAT NTSC
00078 #endif
00079 
00080 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
00081     METEOR_DEV3, METEOR_DEV_SVIDEO };
00082 
00083 uint8_t *video_buf;
00084 size_t video_buf_size;
00085 uint64_t last_frame_time;
00086 volatile sig_atomic_t nsignals;
00087 
00088 
00089 static void catchsignal(int signal)
00090 {
00091     nsignals++;
00092     return;
00093 }
00094 
00095 static av_cold int bktr_init(const char *video_device, int width, int height,
00096     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
00097 {
00098     struct meteor_geomet geo;
00099     int h_max;
00100     long ioctl_frequency;
00101     char *arg;
00102     int c;
00103     struct sigaction act, old;
00104 
00105     if (idev < 0 || idev > 4)
00106     {
00107         arg = getenv ("BKTR_DEV");
00108         if (arg)
00109             idev = atoi (arg);
00110         if (idev < 0 || idev > 4)
00111             idev = 1;
00112     }
00113 
00114     if (format < 1 || format > 6)
00115     {
00116         arg = getenv ("BKTR_FORMAT");
00117         if (arg)
00118             format = atoi (arg);
00119         if (format < 1 || format > 6)
00120             format = VIDEO_FORMAT;
00121     }
00122 
00123     if (frequency <= 0)
00124     {
00125         arg = getenv ("BKTR_FREQUENCY");
00126         if (arg)
00127             frequency = atof (arg);
00128         if (frequency <= 0)
00129             frequency = 0.0;
00130     }
00131 
00132     memset(&act, 0, sizeof(act));
00133     sigemptyset(&act.sa_mask);
00134     act.sa_handler = catchsignal;
00135     sigaction(SIGUSR1, &act, &old);
00136 
00137     *tuner_fd = open("/dev/tuner0", O_RDONLY);
00138     if (*tuner_fd < 0)
00139         av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
00140 
00141     *video_fd = open(video_device, O_RDONLY);
00142     if (*video_fd < 0) {
00143         av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
00144         return -1;
00145     }
00146 
00147     geo.rows = height;
00148     geo.columns = width;
00149     geo.frames = 1;
00150     geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
00151 
00152     switch (format) {
00153     case PAL:   h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00154     case PALN:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALN;     break;
00155     case PALM:  h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALM;     break;
00156     case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM;    break;
00157     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
00158     case NTSCJ: h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCJ;    break;
00159     default:    h_max = PAL_HEIGHT;   c = BT848_IFORM_F_PALBDGHI; break;
00160     }
00161 
00162     if (height <= h_max / 2)
00163         geo.oformat |= METEOR_GEO_EVEN_ONLY;
00164 
00165     if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
00166         av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
00167         return -1;
00168     }
00169 
00170     if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
00171         av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
00172         return -1;
00173     }
00174 
00175     c = bktr_dev[idev];
00176     if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
00177         av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
00178         return -1;
00179     }
00180 
00181     video_buf_size = width * height * 12 / 8;
00182 
00183     video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
00184         PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
00185     if (video_buf == MAP_FAILED) {
00186         av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
00187         return -1;
00188     }
00189 
00190     if (frequency != 0.0) {
00191         ioctl_frequency  = (unsigned long)(frequency*16);
00192         if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
00193             av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
00194     }
00195 
00196     c = AUDIO_UNMUTE;
00197     if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
00198         av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
00199 
00200     c = METEOR_CAP_CONTINOUS;
00201     ioctl(*video_fd, METEORCAPTUR, &c);
00202 
00203     c = SIGUSR1;
00204     ioctl(*video_fd, METEORSSIGNAL, &c);
00205 
00206     return 0;
00207 }
00208 
00209 static void bktr_getframe(uint64_t per_frame)
00210 {
00211     uint64_t curtime;
00212 
00213     curtime = av_gettime();
00214     if (!last_frame_time
00215         || ((last_frame_time + per_frame) > curtime)) {
00216         if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
00217             if (!nsignals)
00218                 av_log(NULL, AV_LOG_INFO,
00219                        "SLEPT NO signals - %d microseconds late\n",
00220                        (int)(av_gettime() - last_frame_time - per_frame));
00221         }
00222     }
00223     nsignals = 0;
00224     last_frame_time = curtime;
00225 }
00226 
00227 
00228 /* note: we support only one picture read at a time */
00229 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
00230 {
00231     VideoData *s = s1->priv_data;
00232 
00233     if (av_new_packet(pkt, video_buf_size) < 0)
00234         return AVERROR(EIO);
00235 
00236     bktr_getframe(s->per_frame);
00237 
00238     pkt->pts = av_gettime();
00239     memcpy(pkt->data, video_buf, video_buf_size);
00240 
00241     return video_buf_size;
00242 }
00243 
00244 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
00245 {
00246     VideoData *s = s1->priv_data;
00247     AVStream *st;
00248     int width, height;
00249     int frame_rate;
00250     int frame_rate_base;
00251     int format = -1;
00252 
00253     if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
00254         return -1;
00255 
00256     width = ap->width;
00257     height = ap->height;
00258     frame_rate = ap->time_base.den;
00259     frame_rate_base = ap->time_base.num;
00260 
00261     st = av_new_stream(s1, 0);
00262     if (!st)
00263         return AVERROR(ENOMEM);
00264     av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
00265 
00266     s->width = width;
00267     s->height = height;
00268     s->frame_rate = frame_rate;
00269     s->frame_rate_base = frame_rate_base;
00270     s->per_frame = ((uint64_t)1000000 * s->frame_rate_base) / s->frame_rate;
00271 
00272     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00273     st->codec->pix_fmt = PIX_FMT_YUV420P;
00274     st->codec->codec_id = CODEC_ID_RAWVIDEO;
00275     st->codec->width = width;
00276     st->codec->height = height;
00277     st->codec->time_base.den = frame_rate;
00278     st->codec->time_base.num = frame_rate_base;
00279 
00280     if (ap->standard) {
00281         if (!strcasecmp(ap->standard, "pal"))
00282             format = PAL;
00283         else if (!strcasecmp(ap->standard, "secam"))
00284             format = SECAM;
00285         else if (!strcasecmp(ap->standard, "ntsc"))
00286             format = NTSC;
00287     }
00288 
00289     if (bktr_init(s1->filename, width, height, format,
00290             &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
00291         return AVERROR(EIO);
00292 
00293     nsignals = 0;
00294     last_frame_time = 0;
00295 
00296     return 0;
00297 }
00298 
00299 static int grab_read_close(AVFormatContext *s1)
00300 {
00301     VideoData *s = s1->priv_data;
00302     int c;
00303 
00304     c = METEOR_CAP_STOP_CONT;
00305     ioctl(s->video_fd, METEORCAPTUR, &c);
00306     close(s->video_fd);
00307 
00308     c = AUDIO_MUTE;
00309     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
00310     close(s->tuner_fd);
00311 
00312     munmap((caddr_t)video_buf, video_buf_size);
00313 
00314     return 0;
00315 }
00316 
00317 AVInputFormat bktr_demuxer = {
00318     "bktr",
00319     NULL_IF_CONFIG_SMALL("video grab"),
00320     sizeof(VideoData),
00321     NULL,
00322     grab_read_header,
00323     grab_read_packet,
00324     grab_read_close,
00325     .flags = AVFMT_NOFILE,
00326 };

Generated on Fri Sep 16 2011 17:17:47 for FFmpeg by  doxygen 1.7.1