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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/internal.h"
29 #include "libavutil/log.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/time.h"
33 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
34 # include <dev/bktr/ioctl_meteor.h>
35 # include <dev/bktr/ioctl_bt848.h>
36 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
37 # include <machine/ioctl_meteor.h>
38 # include <machine/ioctl_bt848.h>
39 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
40 # include <dev/video/meteor/ioctl_meteor.h>
41 # include <dev/video/bktr/ioctl_bt848.h>
42 #elif HAVE_DEV_IC_BT8XX_H
43 # include <dev/ic/bt8xx.h>
44 #endif
45 #include <unistd.h>
46 #include <fcntl.h>
47 #include <sys/ioctl.h>
48 #include <sys/mman.h>
49 #include <sys/time.h>
50 #include <signal.h>
51 #include <stdint.h>
52 #include "avdevice.h"
53 
54 typedef struct VideoData {
55  AVClass *class;
56  int video_fd;
57  int tuner_fd;
58  int width, height;
59  uint64_t per_frame;
60  int standard;
61  char *framerate; /**< Set by a private option. */
62 } VideoData;
63 
64 
65 #define PAL 1
66 #define PALBDGHI 1
67 #define NTSC 2
68 #define NTSCM 2
69 #define SECAM 3
70 #define PALN 4
71 #define PALM 5
72 #define NTSCJ 6
73 
74 /* PAL is 768 x 576. NTSC is 640 x 480 */
75 #define PAL_HEIGHT 576
76 #define SECAM_HEIGHT 576
77 #define NTSC_HEIGHT 480
78 
79 #ifndef VIDEO_FORMAT
80 #define VIDEO_FORMAT NTSC
81 #endif
82 
83 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
84  METEOR_DEV3, METEOR_DEV_SVIDEO };
85 
88 uint64_t last_frame_time;
89 volatile sig_atomic_t nsignals;
90 
91 
92 static void catchsignal(int signal)
93 {
94  nsignals++;
95  return;
96 }
97 
98 static av_cold int bktr_init(const char *video_device, int width, int height,
99  int format, int *video_fd, int *tuner_fd, int idev, double frequency)
100 {
101  struct meteor_geomet geo;
102  int h_max;
103  long ioctl_frequency;
104  char *arg;
105  int c;
106  struct sigaction act = { {0} }, old;
107 
108  if (idev < 0 || idev > 4)
109  {
110  arg = getenv ("BKTR_DEV");
111  if (arg)
112  idev = atoi (arg);
113  if (idev < 0 || idev > 4)
114  idev = 1;
115  }
116 
117  if (format < 1 || format > 6)
118  {
119  arg = getenv ("BKTR_FORMAT");
120  if (arg)
121  format = atoi (arg);
122  if (format < 1 || format > 6)
123  format = VIDEO_FORMAT;
124  }
125 
126  if (frequency <= 0)
127  {
128  arg = getenv ("BKTR_FREQUENCY");
129  if (arg)
130  frequency = atof (arg);
131  if (frequency <= 0)
132  frequency = 0.0;
133  }
134 
135  sigemptyset(&act.sa_mask);
136  act.sa_handler = catchsignal;
137  sigaction(SIGUSR1, &act, &old);
138 
139  *tuner_fd = avpriv_open("/dev/tuner0", O_RDONLY);
140  if (*tuner_fd < 0)
141  av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
142 
143  *video_fd = avpriv_open(video_device, O_RDONLY);
144  if (*video_fd < 0) {
145  av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
146  return -1;
147  }
148 
149  geo.rows = height;
150  geo.columns = width;
151  geo.frames = 1;
152  geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
153 
154  switch (format) {
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;
162  }
163 
164  if (height <= h_max / 2)
165  geo.oformat |= METEOR_GEO_EVEN_ONLY;
166 
167  if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
168  av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
169  return -1;
170  }
171 
172  if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
173  av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
174  return -1;
175  }
176 
177  c = bktr_dev[idev];
178  if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
179  av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
180  return -1;
181  }
182 
183  video_buf_size = width * height * 12 / 8;
184 
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));
189  return -1;
190  }
191 
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));
196  }
197 
198  c = AUDIO_UNMUTE;
199  if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
200  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
201 
202  c = METEOR_CAP_CONTINOUS;
203  ioctl(*video_fd, METEORCAPTUR, &c);
204 
205  c = SIGUSR1;
206  ioctl(*video_fd, METEORSSIGNAL, &c);
207 
208  return 0;
209 }
210 
211 static void bktr_getframe(uint64_t per_frame)
212 {
213  uint64_t curtime;
214 
215  curtime = av_gettime();
216  if (!last_frame_time
217  || ((last_frame_time + per_frame) > curtime)) {
218  if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
219  if (!nsignals)
220  av_log(NULL, AV_LOG_INFO,
221  "SLEPT NO signals - %d microseconds late\n",
222  (int)(av_gettime() - last_frame_time - per_frame));
223  }
224  }
225  nsignals = 0;
226  last_frame_time = curtime;
227 }
228 
229 
230 /* note: we support only one picture read at a time */
232 {
233  VideoData *s = s1->priv_data;
234 
235  if (av_new_packet(pkt, video_buf_size) < 0)
236  return AVERROR(EIO);
237 
239 
240  pkt->pts = av_gettime();
241  memcpy(pkt->data, video_buf, video_buf_size);
242 
243  return video_buf_size;
244 }
245 
247 {
248  VideoData *s = s1->priv_data;
249  AVStream *st;
250  AVRational framerate;
251  int ret = 0;
252 
253  if (!s->framerate)
254  switch (s->standard) {
255  case PAL: s->framerate = av_strdup("pal"); break;
256  case NTSC: s->framerate = av_strdup("ntsc"); break;
257  case SECAM: s->framerate = av_strdup("25"); break;
258  default:
259  av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
260  ret = AVERROR(EINVAL);
261  goto out;
262  }
263  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
264  av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
265  goto out;
266  }
267 
268  st = avformat_new_stream(s1, NULL);
269  if (!st) {
270  ret = AVERROR(ENOMEM);
271  goto out;
272  }
273  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
274 
275  s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
276 
280  st->codec->width = s->width;
281  st->codec->height = s->height;
282  st->codec->time_base.den = framerate.num;
283  st->codec->time_base.num = framerate.den;
284 
285 
286  if (bktr_init(s1->filename, s->width, s->height, s->standard,
287  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
288  ret = AVERROR(EIO);
289  goto out;
290  }
291 
292  nsignals = 0;
293  last_frame_time = 0;
294 
295 out:
296  return ret;
297 }
298 
300 {
301  VideoData *s = s1->priv_data;
302  int c;
303 
304  c = METEOR_CAP_STOP_CONT;
305  ioctl(s->video_fd, METEORCAPTUR, &c);
306  close(s->video_fd);
307 
308  c = AUDIO_MUTE;
309  ioctl(s->tuner_fd, BT848_SAUDIO, &c);
310  close(s->tuner_fd);
311 
312  munmap((caddr_t)video_buf, video_buf_size);
313 
314  return 0;
315 }
316 
317 #define OFFSET(x) offsetof(VideoData, x)
318 #define DEC AV_OPT_FLAG_DECODING_PARAM
319 static const AVOption options[] = {
320  { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
321  { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
322  { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
323  { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
324  { "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
325  { "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
326  { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
327  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
328  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
329  { NULL },
330 };
331 
332 static const AVClass bktr_class = {
333  .class_name = "BKTR grab interface",
334  .item_name = av_default_item_name,
335  .option = options,
336  .version = LIBAVUTIL_VERSION_INT,
338 };
339 
341  .name = "bktr",
342  .long_name = NULL_IF_CONFIG_SMALL("video grab"),
343  .priv_data_size = sizeof(VideoData),
347  .flags = AVFMT_NOFILE,
348  .priv_class = &bktr_class,
349 };