2145994905f9654e2fea6ef088b8cf2d7ed26f8c
[libav.git] / libavformat / grab_bktr.c
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 #include "avformat.h"
27 #if defined(__FreeBSD__)
28 # if __FreeBSD__ >= 502100
29 # include <dev/bktr/ioctl_meteor.h>
30 # include <dev/bktr/ioctl_bt848.h>
31 # else
32 # include <machine/ioctl_meteor.h>
33 # include <machine/ioctl_bt848.h>
34 # endif
35 #elif defined(__FreeBSD_kernel__)
36 # include <dev/bktr/ioctl_meteor.h>
37 # include <dev/bktr/ioctl_bt848.h>
38 #elif defined(__DragonFly__)
39 # include <dev/video/meteor/ioctl_meteor.h>
40 # include <dev/video/bktr/ioctl_bt848.h>
41 #else
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
51 typedef struct {
52 int video_fd;
53 int tuner_fd;
54 int width, height;
55 int frame_rate;
56 int frame_rate_base;
57 u_int64_t per_frame;
58 } VideoData;
59
60
61 #define PAL 1
62 #define PALBDGHI 1
63 #define NTSC 2
64 #define NTSCM 2
65 #define SECAM 3
66 #define PALN 4
67 #define PALM 5
68 #define NTSCJ 6
69
70 /* PAL is 768 x 576. NTSC is 640 x 480 */
71 #define PAL_HEIGHT 576
72 #define SECAM_HEIGHT 576
73 #define NTSC_HEIGHT 480
74
75 #ifndef VIDEO_FORMAT
76 #define VIDEO_FORMAT NTSC
77 #endif
78
79 static int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
80 METEOR_DEV3, METEOR_DEV_SVIDEO };
81
82 uint8_t *video_buf;
83 size_t video_buf_size;
84 u_int64_t last_frame_time;
85 volatile sig_atomic_t nsignals;
86
87
88 static void catchsignal(int signal)
89 {
90 nsignals++;
91 return;
92 }
93
94 static int bktr_init(const char *video_device, int width, int height,
95 int format, int *video_fd, int *tuner_fd, int idev, double frequency)
96 {
97 struct meteor_geomet geo;
98 int h_max;
99 long ioctl_frequency;
100 char *arg;
101 int c;
102 struct sigaction act, old;
103
104 if (idev < 0 || idev > 4)
105 {
106 arg = getenv ("BKTR_DEV");
107 if (arg)
108 idev = atoi (arg);
109 if (idev < 0 || idev > 4)
110 idev = 1;
111 }
112
113 if (format < 1 || format > 6)
114 {
115 arg = getenv ("BKTR_FORMAT");
116 if (arg)
117 format = atoi (arg);
118 if (format < 1 || format > 6)
119 format = VIDEO_FORMAT;
120 }
121
122 if (frequency <= 0)
123 {
124 arg = getenv ("BKTR_FREQUENCY");
125 if (arg)
126 frequency = atof (arg);
127 if (frequency <= 0)
128 frequency = 0.0;
129 }
130
131 memset(&act, 0, sizeof(act));
132 sigemptyset(&act.sa_mask);
133 act.sa_handler = catchsignal;
134 sigaction(SIGUSR1, &act, &old);
135
136 *tuner_fd = open("/dev/tuner0", O_RDONLY);
137 if (*tuner_fd < 0)
138 perror("Warning: Tuner not opened, continuing");
139
140 *video_fd = open(video_device, O_RDONLY);
141 if (*video_fd < 0) {
142 perror(video_device);
143 return -1;
144 }
145
146 geo.rows = height;
147 geo.columns = width;
148 geo.frames = 1;
149 geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
150
151 switch (format) {
152 case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
153 case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
154 case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
155 case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
156 case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
157 case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
158 default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
159 }
160
161 if (height <= h_max / 2)
162 geo.oformat |= METEOR_GEO_EVEN_ONLY;
163
164 if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
165 perror("METEORSETGEO");
166 return -1;
167 }
168
169 if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
170 perror("BT848SFMT");
171 return -1;
172 }
173
174 c = bktr_dev[idev];
175 if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
176 perror("METEORSINPUT");
177 return -1;
178 }
179
180 video_buf_size = width * height * 12 / 8;
181
182 video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
183 PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
184 if (video_buf == MAP_FAILED) {
185 perror("mmap");
186 return -1;
187 }
188
189 if (frequency != 0.0) {
190 ioctl_frequency = (unsigned long)(frequency*16);
191 if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
192 perror("TVTUNER_SETFREQ");
193 }
194
195 c = AUDIO_UNMUTE;
196 if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
197 perror("TVTUNER_SAUDIO");
198
199 c = METEOR_CAP_CONTINOUS;
200 ioctl(*video_fd, METEORCAPTUR, &c);
201
202 c = SIGUSR1;
203 ioctl(*video_fd, METEORSSIGNAL, &c);
204
205 return 0;
206 }
207
208 static void bktr_getframe(u_int64_t per_frame)
209 {
210 u_int64_t curtime;
211
212 curtime = av_gettime();
213 if (!last_frame_time
214 || ((last_frame_time + per_frame) > curtime)) {
215 if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
216 if (!nsignals)
217 av_log(NULL, AV_LOG_INFO,
218 "SLEPT NO signals - %d microseconds late\n",
219 (int)(av_gettime() - last_frame_time - per_frame));
220 }
221 }
222 nsignals = 0;
223 last_frame_time = curtime;
224 }
225
226
227 /* note: we support only one picture read at a time */
228 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
229 {
230 VideoData *s = s1->priv_data;
231
232 if (av_new_packet(pkt, video_buf_size) < 0)
233 return -EIO;
234
235 bktr_getframe(s->per_frame);
236
237 pkt->pts = av_gettime();
238 memcpy(pkt->data, video_buf, video_buf_size);
239
240 return video_buf_size;
241 }
242
243 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
244 {
245 VideoData *s = s1->priv_data;
246 AVStream *st;
247 int width, height;
248 int frame_rate;
249 int frame_rate_base;
250 int format = -1;
251 const char *video_device;
252
253 if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0)
254 return -1;
255
256 width = ap->width;
257 height = ap->height;
258 frame_rate = ap->time_base.den;
259 frame_rate_base = ap->time_base.num;
260
261 video_device = ap->device;
262 if (!video_device)
263 video_device = "/dev/bktr0";
264
265 st = av_new_stream(s1, 0);
266 if (!st)
267 return -ENOMEM;
268 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
269
270 s->width = width;
271 s->height = height;
272 s->frame_rate = frame_rate;
273 s->frame_rate_base = frame_rate_base;
274 s->per_frame = ((u_int64_t)1000000 * s->frame_rate_base) / s->frame_rate;
275
276 st->codec->codec_type = CODEC_TYPE_VIDEO;
277 st->codec->pix_fmt = PIX_FMT_YUV420P;
278 st->codec->codec_id = CODEC_ID_RAWVIDEO;
279 st->codec->width = width;
280 st->codec->height = height;
281 st->codec->time_base.den = frame_rate;
282 st->codec->time_base.num = frame_rate_base;
283
284 if (ap->standard) {
285 if (!strcasecmp(ap->standard, "pal"))
286 format = PAL;
287 else if (!strcasecmp(ap->standard, "secam"))
288 format = SECAM;
289 else if (!strcasecmp(ap->standard, "ntsc"))
290 format = NTSC;
291 }
292
293 if (bktr_init(video_device, width, height, format,
294 &(s->video_fd), &(s->tuner_fd), -1, 0.0) < 0)
295 return -EIO;
296
297 nsignals = 0;
298 last_frame_time = 0;
299
300 return 0;
301 }
302
303 static int grab_read_close(AVFormatContext *s1)
304 {
305 VideoData *s = s1->priv_data;
306 int c;
307
308 c = METEOR_CAP_STOP_CONT;
309 ioctl(s->video_fd, METEORCAPTUR, &c);
310 close(s->video_fd);
311
312 c = AUDIO_MUTE;
313 ioctl(s->tuner_fd, BT848_SAUDIO, &c);
314 close(s->tuner_fd);
315
316 munmap((caddr_t)video_buf, video_buf_size);
317
318 return 0;
319 }
320
321 AVInputFormat video_grab_device_demuxer = {
322 "bktr",
323 "video grab",
324 sizeof(VideoData),
325 NULL,
326 grab_read_header,
327 grab_read_packet,
328 grab_read_close,
329 .flags = AVFMT_NOFILE,
330 };