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bktr.c
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1 /*
2  * *BSD video grab interface
3  * Copyright (c) 2002 Steve O'Hara-Smith
4  * based on
5  * Linux video grab interface
6  * Copyright (c) 2000,2001 Gerard Lantau
7  * and
8  * simple_grab.c Copyright (c) 1999 Roger Hardiman
9  *
10  * This file is part of FFmpeg.
11  *
12  * FFmpeg 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.
16  *
17  * FFmpeg 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.
21  *
22  * You should have received a copy of the GNU Lesser General Public
23  * License along with FFmpeg; if not, write to the Free Software
24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25  */
26 
27 #include "libavformat/internal.h"
28 #include "libavutil/log.h"
29 #include "libavutil/opt.h"
30 #include "libavutil/parseutils.h"
31 #include "libavutil/time.h"
32 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
33 # include <dev/bktr/ioctl_meteor.h>
34 # include <dev/bktr/ioctl_bt848.h>
35 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
36 # include <machine/ioctl_meteor.h>
37 # include <machine/ioctl_bt848.h>
38 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
39 # include <dev/video/meteor/ioctl_meteor.h>
40 # include <dev/video/bktr/ioctl_bt848.h>
41 #elif HAVE_DEV_IC_BT8XX_H
42 # include <dev/ic/bt8xx.h>
43 #endif
44 #include <unistd.h>
45 #include <fcntl.h>
46 #include <sys/ioctl.h>
47 #include <sys/mman.h>
48 #include <sys/time.h>
49 #include <signal.h>
50 #include <stdint.h>
51 #include "avdevice.h"
52 
53 typedef struct {
54  AVClass *class;
55  int video_fd;
56  int tuner_fd;
57  int width, height;
58  uint64_t per_frame;
59  int standard;
60  char *framerate; /**< Set by a private option. */
61 } VideoData;
62 
63 
64 #define PAL 1
65 #define PALBDGHI 1
66 #define NTSC 2
67 #define NTSCM 2
68 #define SECAM 3
69 #define PALN 4
70 #define PALM 5
71 #define NTSCJ 6
72 
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
77 
78 #ifndef VIDEO_FORMAT
79 #define VIDEO_FORMAT NTSC
80 #endif
81 
82 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
83  METEOR_DEV3, METEOR_DEV_SVIDEO };
84 
87 uint64_t last_frame_time;
88 volatile sig_atomic_t nsignals;
89 
90 
91 static void catchsignal(int signal)
92 {
93  nsignals++;
94  return;
95 }
96 
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)
99 {
100  struct meteor_geomet geo;
101  int h_max;
102  long ioctl_frequency;
103  char *arg;
104  int c;
105  struct sigaction act = { {0} }, old;
106 
107  if (idev < 0 || idev > 4)
108  {
109  arg = getenv ("BKTR_DEV");
110  if (arg)
111  idev = atoi (arg);
112  if (idev < 0 || idev > 4)
113  idev = 1;
114  }
115 
116  if (format < 1 || format > 6)
117  {
118  arg = getenv ("BKTR_FORMAT");
119  if (arg)
120  format = atoi (arg);
121  if (format < 1 || format > 6)
122  format = VIDEO_FORMAT;
123  }
124 
125  if (frequency <= 0)
126  {
127  arg = getenv ("BKTR_FREQUENCY");
128  if (arg)
129  frequency = atof (arg);
130  if (frequency <= 0)
131  frequency = 0.0;
132  }
133 
134  sigemptyset(&act.sa_mask);
135  act.sa_handler = catchsignal;
136  sigaction(SIGUSR1, &act, &old);
137 
138  *tuner_fd = open("/dev/tuner0", O_RDONLY);
139  if (*tuner_fd < 0)
140  av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
141 
142  *video_fd = open(video_device, O_RDONLY);
143  if (*video_fd < 0) {
144  av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
145  return -1;
146  }
147 
148  geo.rows = height;
149  geo.columns = width;
150  geo.frames = 1;
151  geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
152 
153  switch (format) {
154  case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
155  case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
156  case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
157  case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
158  case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
159  case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
160  default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
161  }
162 
163  if (height <= h_max / 2)
164  geo.oformat |= METEOR_GEO_EVEN_ONLY;
165 
166  if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
167  av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
168  return -1;
169  }
170 
171  if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
172  av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
173  return -1;
174  }
175 
176  c = bktr_dev[idev];
177  if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
178  av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
179  return -1;
180  }
181 
182  video_buf_size = width * height * 12 / 8;
183 
184  video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
185  PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
186  if (video_buf == MAP_FAILED) {
187  av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
188  return -1;
189  }
190 
191  if (frequency != 0.0) {
192  ioctl_frequency = (unsigned long)(frequency*16);
193  if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
194  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
195  }
196 
197  c = AUDIO_UNMUTE;
198  if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
199  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
200 
201  c = METEOR_CAP_CONTINOUS;
202  ioctl(*video_fd, METEORCAPTUR, &c);
203 
204  c = SIGUSR1;
205  ioctl(*video_fd, METEORSSIGNAL, &c);
206 
207  return 0;
208 }
209 
210 static void bktr_getframe(uint64_t per_frame)
211 {
212  uint64_t curtime;
213 
214  curtime = av_gettime();
215  if (!last_frame_time
216  || ((last_frame_time + per_frame) > curtime)) {
217  if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
218  if (!nsignals)
219  av_log(NULL, AV_LOG_INFO,
220  "SLEPT NO signals - %d microseconds late\n",
221  (int)(av_gettime() - last_frame_time - per_frame));
222  }
223  }
224  nsignals = 0;
225  last_frame_time = curtime;
226 }
227 
228 
229 /* note: we support only one picture read at a time */
231 {
232  VideoData *s = s1->priv_data;
233 
234  if (av_new_packet(pkt, video_buf_size) < 0)
235  return AVERROR(EIO);
236 
238 
239  pkt->pts = av_gettime();
240  memcpy(pkt->data, video_buf, video_buf_size);
241 
242  return video_buf_size;
243 }
244 
246 {
247  VideoData *s = s1->priv_data;
248  AVStream *st;
249  AVRational framerate;
250  int ret = 0;
251 
252  if (!s->framerate)
253  switch (s->standard) {
254  case PAL: s->framerate = av_strdup("pal"); break;
255  case NTSC: s->framerate = av_strdup("ntsc"); break;
256  case SECAM: s->framerate = av_strdup("25"); break;
257  default:
258  av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
259  ret = AVERROR(EINVAL);
260  goto out;
261  }
262  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
263  av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
264  goto out;
265  }
266 
267  st = avformat_new_stream(s1, NULL);
268  if (!st) {
269  ret = AVERROR(ENOMEM);
270  goto out;
271  }
272  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
273 
274  s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
275 
279  st->codec->width = s->width;
280  st->codec->height = s->height;
281  st->codec->time_base.den = framerate.num;
282  st->codec->time_base.num = framerate.den;
283 
284 
285  if (bktr_init(s1->filename, s->width, s->height, s->standard,
286  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
287  ret = AVERROR(EIO);
288  goto out;
289  }
290 
291  nsignals = 0;
292  last_frame_time = 0;
293 
294 out:
295  return ret;
296 }
297 
299 {
300  VideoData *s = s1->priv_data;
301  int c;
302 
303  c = METEOR_CAP_STOP_CONT;
304  ioctl(s->video_fd, METEORCAPTUR, &c);
305  close(s->video_fd);
306 
307  c = AUDIO_MUTE;
308  ioctl(s->tuner_fd, BT848_SAUDIO, &c);
309  close(s->tuner_fd);
310 
311  munmap((caddr_t)video_buf, video_buf_size);
312 
313  return 0;
314 }
315 
316 #define OFFSET(x) offsetof(VideoData, x)
317 #define DEC AV_OPT_FLAG_DECODING_PARAM
318 static const AVOption options[] = {
319  { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
320  { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
321  { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
322  { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
323  { "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
324  { "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
325  { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
326  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
327  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
328  { NULL },
329 };
330 
331 static const AVClass bktr_class = {
332  .class_name = "BKTR grab interface",
333  .item_name = av_default_item_name,
334  .option = options,
335  .version = LIBAVUTIL_VERSION_INT,
336 };
337 
339  .name = "bktr",
340  .long_name = NULL_IF_CONFIG_SMALL("video grab"),
341  .priv_data_size = sizeof(VideoData),
345  .flags = AVFMT_NOFILE,
346  .priv_class = &bktr_class,
347 };