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 *framerate;  
00060 } VideoData;
00061 
00062 
00063 #define PAL 1
00064 #define PALBDGHI 1
00065 #define NTSC 2
00066 #define NTSCM 2
00067 #define SECAM 3
00068 #define PALN 4
00069 #define PALM 5
00070 #define NTSCJ 6
00071 
00072 /* PAL is 768 x 576. NTSC is 640 x 480 */
00073 #define PAL_HEIGHT 576
00074 #define SECAM_HEIGHT 576
00075 #define NTSC_HEIGHT 480
00076 
00077 #ifndef VIDEO_FORMAT
00078 #define VIDEO_FORMAT NTSC
00079 #endif
00080 
00081 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
00082     METEOR_DEV3, METEOR_DEV_SVIDEO };
00083 
00084 uint8_t *video_buf;
00085 size_t video_buf_size;
00086 uint64_t last_frame_time;
00087 volatile sig_atomic_t nsignals;
00088 
00089 
00090 static void catchsignal(int signal)
00091 {
00092     nsignals++;
00093     return;
00094 }
00095 
00096 static av_cold int bktr_init(const char *video_device, int width, int height,
00097     int format, int *video_fd, int *tuner_fd, int idev, double frequency)
00098 {
00099     struct meteor_geomet geo;
00100     int h_max;
00101     long ioctl_frequency;
00102     char *arg;
00103     int c;
00104     struct sigaction act = { 0 }, old;
00105 
00106     if (idev < 0 || idev > 4)
00107     {
00108         arg = getenv ("BKTR_DEV");
00109         if (arg)
00110             idev = atoi (arg);
00111         if (idev < 0 || idev > 4)
00112             idev = 1;
00113     }
00114 
00115     if (format < 1 || format > 6)
00116     {
00117         arg = getenv ("BKTR_FORMAT");
00118         if (arg)
00119             format = atoi (arg);
00120         if (format < 1 || format > 6)
00121             format = VIDEO_FORMAT;
00122     }
00123 
00124     if (frequency <= 0)
00125     {
00126         arg = getenv ("BKTR_FREQUENCY");
00127         if (arg)
00128             frequency = atof (arg);
00129         if (frequency <= 0)
00130             frequency = 0.0;
00131     }
00132 
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)
00245 {
00246     VideoData *s = s1->priv_data;
00247     AVStream *st;
00248     AVRational framerate;
00249     int ret = 0;
00250 
00251     if (!s->framerate)
00252         switch (s->standard) {
00253         case PAL:   s->framerate = av_strdup("pal");  break;
00254         case NTSC:  s->framerate = av_strdup("ntsc"); break;
00255         case SECAM: s->framerate = av_strdup("25");   break;
00256         default:
00257             av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
00258             ret = AVERROR(EINVAL);
00259             goto out;
00260         }
00261     if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
00262         av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
00263         goto out;
00264     }
00265 
00266     st = avformat_new_stream(s1, NULL);
00267     if (!st) {
00268         ret = AVERROR(ENOMEM);
00269         goto out;
00270     }
00271     avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
00272 
00273     s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
00274 
00275     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00276     st->codec->pix_fmt = PIX_FMT_YUV420P;
00277     st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
00278     st->codec->width = s->width;
00279     st->codec->height = s->height;
00280     st->codec->time_base.den = framerate.num;
00281     st->codec->time_base.num = framerate.den;
00282 
00283 
00284     if (bktr_init(s1->filename, s->width, s->height, s->standard,
00285                   &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
00286         ret = AVERROR(EIO);
00287         goto out;
00288     }
00289 
00290     nsignals = 0;
00291     last_frame_time = 0;
00292 
00293 out:
00294     return ret;
00295 }
00296 
00297 static int grab_read_close(AVFormatContext *s1)
00298 {
00299     VideoData *s = s1->priv_data;
00300     int c;
00301 
00302     c = METEOR_CAP_STOP_CONT;
00303     ioctl(s->video_fd, METEORCAPTUR, &c);
00304     close(s->video_fd);
00305 
00306     c = AUDIO_MUTE;
00307     ioctl(s->tuner_fd, BT848_SAUDIO, &c);
00308     close(s->tuner_fd);
00309 
00310     munmap((caddr_t)video_buf, video_buf_size);
00311 
00312     return 0;
00313 }
00314 
00315 #define OFFSET(x) offsetof(VideoData, x)
00316 #define DEC AV_OPT_FLAG_DECODING_PARAM
00317 static const AVOption options[] = {
00318     { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00319     { "PAL",      "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL},   0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00320     { "NTSC",     "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00321     { "SECAM",    "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00322     { "PALN",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00323     { "PALM",     "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM},  0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00324     { "NTSCJ",    "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
00325     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
00326     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
00327     { NULL },
00328 };
00329 
00330 static const AVClass bktr_class = {
00331     .class_name = "BKTR grab interface",
00332     .item_name  = av_default_item_name,
00333     .option     = options,
00334     .version    = LIBAVUTIL_VERSION_INT,
00335 };
00336 
00337 AVInputFormat ff_bktr_demuxer = {
00338     .name           = "bktr",
00339     .long_name      = NULL_IF_CONFIG_SMALL("video grab"),
00340     .priv_data_size = sizeof(VideoData),
00341     .read_header    = grab_read_header,
00342     .read_packet    = grab_read_packet,
00343     .read_close     = grab_read_close,
00344     .flags          = AVFMT_NOFILE,
00345     .priv_class     = &bktr_class,
00346 };