2 * *BSD video grab interface
3 * Copyright (c) 2002 Steve O'Hara-Smith
5 * Linux video grab interface
6 * Copyright (c) 2000,2001 Gerard Lantau
8 * simple_grab.c Copyright (c) 1999 Roger Hardiman
10 * This file is part of Libav.
12 * Libav 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.
17 * Libav 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.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with Libav; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavformat/avformat.h"
28 #include "libavutil/log.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
31 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
32 # include <dev/bktr/ioctl_meteor.h>
33 # include <dev/bktr/ioctl_bt848.h>
34 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
35 # include <machine/ioctl_meteor.h>
36 # include <machine/ioctl_bt848.h>
37 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
38 # include <dev/video/meteor/ioctl_meteor.h>
39 # include <dev/video/bktr/ioctl_bt848.h>
40 #elif HAVE_DEV_IC_BT8XX_H
41 # include <dev/ic/bt8xx.h>
45 #include <sys/ioctl.h>
59 char *video_size; /**< String describing video size, set by a private option. */
60 char *framerate; /**< Set by a private option. */
73 /* PAL is 768 x 576. NTSC is 640 x 480 */
74 #define PAL_HEIGHT 576
75 #define SECAM_HEIGHT 576
76 #define NTSC_HEIGHT 480
79 #define VIDEO_FORMAT NTSC
82 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
83 METEOR_DEV3, METEOR_DEV_SVIDEO };
86 size_t video_buf_size;
87 uint64_t last_frame_time;
88 volatile sig_atomic_t nsignals;
91 static void catchsignal(int signal)
97 static av_cold int bktr_init(const char *video_device, int width, int height,
98 int format, int *video_fd, int *tuner_fd, int idev, double frequency)
100 struct meteor_geomet geo;
102 long ioctl_frequency;
105 struct sigaction act, old;
107 if (idev < 0 || idev > 4)
109 arg = getenv ("BKTR_DEV");
112 if (idev < 0 || idev > 4)
116 if (format < 1 || format > 6)
118 arg = getenv ("BKTR_FORMAT");
121 if (format < 1 || format > 6)
122 format = VIDEO_FORMAT;
127 arg = getenv ("BKTR_FREQUENCY");
129 frequency = atof (arg);
134 memset(&act, 0, sizeof(act));
135 sigemptyset(&act.sa_mask);
136 act.sa_handler = catchsignal;
137 sigaction(SIGUSR1, &act, &old);
139 *tuner_fd = open("/dev/tuner0", O_RDONLY);
141 av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
143 *video_fd = open(video_device, O_RDONLY);
145 av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
152 geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
155 case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
156 case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
157 case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
158 case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
159 case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
160 case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
161 default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
164 if (height <= h_max / 2)
165 geo.oformat |= METEOR_GEO_EVEN_ONLY;
167 if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
168 av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
172 if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
173 av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
178 if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
179 av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
183 video_buf_size = width * height * 12 / 8;
185 video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
186 PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
187 if (video_buf == MAP_FAILED) {
188 av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
192 if (frequency != 0.0) {
193 ioctl_frequency = (unsigned long)(frequency*16);
194 if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
195 av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
199 if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
200 av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
202 c = METEOR_CAP_CONTINOUS;
203 ioctl(*video_fd, METEORCAPTUR, &c);
206 ioctl(*video_fd, METEORSSIGNAL, &c);
211 static void bktr_getframe(uint64_t per_frame)
215 curtime = av_gettime();
217 || ((last_frame_time + per_frame) > curtime)) {
218 if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
220 av_log(NULL, AV_LOG_INFO,
221 "SLEPT NO signals - %d microseconds late\n",
222 (int)(av_gettime() - last_frame_time - per_frame));
226 last_frame_time = curtime;
230 /* note: we support only one picture read at a time */
231 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
233 VideoData *s = s1->priv_data;
235 if (av_new_packet(pkt, video_buf_size) < 0)
238 bktr_getframe(s->per_frame);
240 pkt->pts = av_gettime();
241 memcpy(pkt->data, video_buf, video_buf_size);
243 return video_buf_size;
246 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
248 VideoData *s = s1->priv_data;
251 AVRational framerate;
254 if ((ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
255 av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
260 switch (s->standard) {
261 case PAL: s->framerate = av_strdup("pal"); break;
262 case NTSC: s->framerate = av_strdup("ntsc"); break;
263 case SECAM: s->framerate = av_strdup("25"); break;
265 av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
266 ret = AVERROR(EINVAL);
269 if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
270 av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
274 st = avformat_new_stream(s1, NULL);
276 ret = AVERROR(ENOMEM);
279 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
283 s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
285 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
286 st->codec->pix_fmt = PIX_FMT_YUV420P;
287 st->codec->codec_id = CODEC_ID_RAWVIDEO;
288 st->codec->width = width;
289 st->codec->height = height;
290 st->codec->time_base.den = framerate.num;
291 st->codec->time_base.num = framerate.den;
294 if (bktr_init(s1->filename, width, height, s->standard,
295 &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0) {
307 static int grab_read_close(AVFormatContext *s1)
309 VideoData *s = s1->priv_data;
312 c = METEOR_CAP_STOP_CONT;
313 ioctl(s->video_fd, METEORCAPTUR, &c);
317 ioctl(s->tuner_fd, BT848_SAUDIO, &c);
320 munmap((caddr_t)video_buf, video_buf_size);
325 #define OFFSET(x) offsetof(VideoData, x)
326 #define DEC AV_OPT_FLAG_DECODING_PARAM
327 static const AVOption options[] = {
328 { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.dbl = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
329 { "PAL", "", 0, AV_OPT_TYPE_CONST, {.dbl = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
330 { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
331 { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.dbl = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
332 { "PALN", "", 0, AV_OPT_TYPE_CONST, {.dbl = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
333 { "PALM", "", 0, AV_OPT_TYPE_CONST, {.dbl = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
334 { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.dbl = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
335 { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga"}, 0, 0, DEC },
336 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
340 static const AVClass bktr_class = {
341 .class_name = "BKTR grab interface",
342 .item_name = av_default_item_name,
344 .version = LIBAVUTIL_VERSION_INT,
347 AVInputFormat ff_bktr_demuxer = {
349 .long_name = NULL_IF_CONFIG_SMALL("video grab"),
350 .priv_data_size = sizeof(VideoData),
351 .read_header = grab_read_header,
352 .read_packet = grab_read_packet,
353 .read_close = grab_read_close,
354 .flags = AVFMT_NOFILE,
355 .priv_class = &bktr_class,