Libav
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 Libav.
11  *
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.
16  *
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.
21  *
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
25  */
26 
27 #include "libavformat/avformat.h"
28 #include "libavformat/internal.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/log.h"
31 #include "libavutil/opt.h"
32 #include "libavutil/parseutils.h"
33 #include "libavutil/time.h"
34 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H
35 # include <dev/bktr/ioctl_meteor.h>
36 # include <dev/bktr/ioctl_bt848.h>
37 #elif HAVE_MACHINE_IOCTL_METEOR_H && HAVE_MACHINE_IOCTL_BT848_H
38 # include <machine/ioctl_meteor.h>
39 # include <machine/ioctl_bt848.h>
40 #elif HAVE_DEV_VIDEO_METEOR_IOCTL_METEOR_H && HAVE_DEV_VIDEO_BKTR_IOCTL_BT848_H
41 # include <dev/video/meteor/ioctl_meteor.h>
42 # include <dev/video/bktr/ioctl_bt848.h>
43 #elif HAVE_DEV_IC_BT8XX_H
44 # include <dev/ic/bt8xx.h>
45 #endif
46 #include <unistd.h>
47 #include <fcntl.h>
48 #include <sys/ioctl.h>
49 #include <sys/mman.h>
50 #include <sys/time.h>
51 #include <signal.h>
52 #include <stdint.h>
53 
54 typedef struct {
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 *video_size;
62  char *framerate;
63 } VideoData;
64 
65 
66 #define PAL 1
67 #define PALBDGHI 1
68 #define NTSC 2
69 #define NTSCM 2
70 #define SECAM 3
71 #define PALN 4
72 #define PALM 5
73 #define NTSCJ 6
74 
75 /* PAL is 768 x 576. NTSC is 640 x 480 */
76 #define PAL_HEIGHT 576
77 #define SECAM_HEIGHT 576
78 #define NTSC_HEIGHT 480
79 
80 #ifndef VIDEO_FORMAT
81 #define VIDEO_FORMAT NTSC
82 #endif
83 
84 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
85  METEOR_DEV3, METEOR_DEV_SVIDEO };
86 
89 uint64_t last_frame_time;
90 volatile sig_atomic_t nsignals;
91 
92 
93 static void catchsignal(int signal)
94 {
95  nsignals++;
96  return;
97 }
98 
99 static av_cold int bktr_init(const char *video_device, int width, int height,
100  int format, int *video_fd, int *tuner_fd, int idev, double frequency)
101 {
102  struct meteor_geomet geo;
103  int h_max;
104  long ioctl_frequency;
105  char *arg;
106  int c;
107  struct sigaction act = { 0 }, old;
108 
109  if (idev < 0 || idev > 4)
110  {
111  arg = getenv ("BKTR_DEV");
112  if (arg)
113  idev = atoi (arg);
114  if (idev < 0 || idev > 4)
115  idev = 1;
116  }
117 
118  if (format < 1 || format > 6)
119  {
120  arg = getenv ("BKTR_FORMAT");
121  if (arg)
122  format = atoi (arg);
123  if (format < 1 || format > 6)
124  format = VIDEO_FORMAT;
125  }
126 
127  if (frequency <= 0)
128  {
129  arg = getenv ("BKTR_FREQUENCY");
130  if (arg)
131  frequency = atof (arg);
132  if (frequency <= 0)
133  frequency = 0.0;
134  }
135 
136  sigemptyset(&act.sa_mask);
137  act.sa_handler = catchsignal;
138  sigaction(SIGUSR1, &act, &old);
139 
140  *tuner_fd = avpriv_open("/dev/tuner0", O_RDONLY);
141  if (*tuner_fd < 0)
142  av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
143 
144  *video_fd = avpriv_open(video_device, O_RDONLY);
145  if (*video_fd < 0) {
146  av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, strerror(errno));
147  return -1;
148  }
149 
150  geo.rows = height;
151  geo.columns = width;
152  geo.frames = 1;
153  geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
154 
155  switch (format) {
156  case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
157  case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
158  case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
159  case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
160  case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
161  case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
162  default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
163  }
164 
165  if (height <= h_max / 2)
166  geo.oformat |= METEOR_GEO_EVEN_ONLY;
167 
168  if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
169  av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", strerror(errno));
170  return -1;
171  }
172 
173  if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
174  av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", strerror(errno));
175  return -1;
176  }
177 
178  c = bktr_dev[idev];
179  if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
180  av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", strerror(errno));
181  return -1;
182  }
183 
184  video_buf_size = width * height * 12 / 8;
185 
186  video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
187  PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
188  if (video_buf == MAP_FAILED) {
189  av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
190  return -1;
191  }
192 
193  if (frequency != 0.0) {
194  ioctl_frequency = (unsigned long)(frequency*16);
195  if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
196  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
197  }
198 
199  c = AUDIO_UNMUTE;
200  if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
201  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
202 
203  c = METEOR_CAP_CONTINOUS;
204  ioctl(*video_fd, METEORCAPTUR, &c);
205 
206  c = SIGUSR1;
207  ioctl(*video_fd, METEORSSIGNAL, &c);
208 
209  return 0;
210 }
211 
212 static void bktr_getframe(uint64_t per_frame)
213 {
214  uint64_t curtime;
215 
216  curtime = av_gettime();
217  if (!last_frame_time
218  || ((last_frame_time + per_frame) > curtime)) {
219  if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
220  if (!nsignals)
222  "SLEPT NO signals - %d microseconds late\n",
223  (int)(av_gettime() - last_frame_time - per_frame));
224  }
225  }
226  nsignals = 0;
227  last_frame_time = curtime;
228 }
229 
230 
231 /* note: we support only one picture read at a time */
233 {
234  VideoData *s = s1->priv_data;
235 
236  if (av_new_packet(pkt, video_buf_size) < 0)
237  return AVERROR(EIO);
238 
240 
241  pkt->pts = av_gettime();
242  memcpy(pkt->data, video_buf, video_buf_size);
243 
244  return video_buf_size;
245 }
246 
248 {
249  VideoData *s = s1->priv_data;
250  AVStream *st;
251  int width, height;
252  AVRational framerate;
253  int ret = 0;
254 
255  if ((ret = av_parse_video_size(&width, &height, s->video_size)) < 0) {
256  av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", s->video_size);
257  goto out;
258  }
259 
260  if (!s->framerate)
261  switch (s->standard) {
262  case PAL: s->framerate = av_strdup("pal"); break;
263  case NTSC: s->framerate = av_strdup("ntsc"); break;
264  case SECAM: s->framerate = av_strdup("25"); break;
265  default:
266  av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
267  ret = AVERROR(EINVAL);
268  goto out;
269  }
270  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
271  av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
272  goto out;
273  }
274 
275  st = avformat_new_stream(s1, NULL);
276  if (!st) {
277  ret = AVERROR(ENOMEM);
278  goto out;
279  }
280  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
281 
282  s->width = width;
283  s->height = height;
284  s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
285 
289  st->codec->width = width;
290  st->codec->height = height;
291  st->codec->time_base.den = framerate.num;
292  st->codec->time_base.num = framerate.den;
293 
294 
295  if (bktr_init(s1->filename, width, height, s->standard,
296  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
297  ret = AVERROR(EIO);
298  goto out;
299  }
300 
301  nsignals = 0;
302  last_frame_time = 0;
303 
304 out:
305  return ret;
306 }
307 
309 {
310  VideoData *s = s1->priv_data;
311  int c;
312 
313  c = METEOR_CAP_STOP_CONT;
314  ioctl(s->video_fd, METEORCAPTUR, &c);
315  close(s->video_fd);
316 
317  c = AUDIO_MUTE;
318  ioctl(s->tuner_fd, BT848_SAUDIO, &c);
319  close(s->tuner_fd);
320 
321  munmap((caddr_t)video_buf, video_buf_size);
322 
323  return 0;
324 }
325 
326 #define OFFSET(x) offsetof(VideoData, x)
327 #define DEC AV_OPT_FLAG_DECODING_PARAM
328 static const AVOption options[] = {
329  { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
330  { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
331  { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
332  { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
333  { "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
334  { "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
335  { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
336  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = "vga"}, 0, 0, DEC },
337  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
338  { NULL },
339 };
340 
341 static const AVClass bktr_class = {
342  .class_name = "BKTR grab interface",
343  .item_name = av_default_item_name,
344  .option = options,
345  .version = LIBAVUTIL_VERSION_INT,
346 };
347 
349  .name = "bktr",
350  .long_name = NULL_IF_CONFIG_SMALL("video grab"),
351  .priv_data_size = sizeof(VideoData),
355  .flags = AVFMT_NOFILE,
356  .priv_class = &bktr_class,
357 };