FFmpeg
bktr.c
Go to the documentation of this file.
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 Fabrice Bellard
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/file_open.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 #include "avdevice.h"
54 
55 typedef struct VideoData {
56  AVClass *class;
57  int video_fd;
58  int tuner_fd;
59  int width, height;
60  uint64_t per_frame;
61  int standard;
62  char *framerate; /**< Set by a private option. */
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 const int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
85  METEOR_DEV3, METEOR_DEV_SVIDEO };
86 
87 uint8_t *video_buf;
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, old;
108  int ret;
109  char errbuf[128];
110 
111  if (idev < 0 || idev > 4)
112  {
113  arg = getenv ("BKTR_DEV");
114  if (arg)
115  idev = atoi (arg);
116  if (idev < 0 || idev > 4)
117  idev = 1;
118  }
119 
120  if (format < 1 || format > 6)
121  {
122  arg = getenv ("BKTR_FORMAT");
123  if (arg)
124  format = atoi (arg);
125  if (format < 1 || format > 6)
127  }
128 
129  if (frequency <= 0)
130  {
131  arg = getenv ("BKTR_FREQUENCY");
132  if (arg)
133  frequency = atof (arg);
134  if (frequency <= 0)
135  frequency = 0.0;
136  }
137 
138  memset(&act, 0, sizeof(act));
139  sigemptyset(&act.sa_mask);
140  act.sa_handler = catchsignal;
141  sigaction(SIGUSR1, &act, &old);
142 
143  *tuner_fd = avpriv_open("/dev/tuner0", O_RDONLY);
144  if (*tuner_fd < 0)
145  av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
146 
147  *video_fd = avpriv_open(video_device, O_RDONLY);
148  if (*video_fd < 0) {
149  ret = AVERROR(errno);
150  av_strerror(ret, errbuf, sizeof(errbuf));
151  av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, errbuf);
152  return ret;
153  }
154 
155  geo.rows = height;
156  geo.columns = width;
157  geo.frames = 1;
158  geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
159 
160  switch (format) {
161  case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
162  case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
163  case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
164  case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
165  case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
166  case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
167  default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
168  }
169 
170  if (height <= h_max / 2)
171  geo.oformat |= METEOR_GEO_EVEN_ONLY;
172 
173  if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
174  ret = AVERROR(errno);
175  av_strerror(ret, errbuf, sizeof(errbuf));
176  av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", errbuf);
177  return ret;
178  }
179 
180  if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
181  ret = AVERROR(errno);
182  av_strerror(ret, errbuf, sizeof(errbuf));
183  av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", errbuf);
184  return ret;
185  }
186 
187  c = bktr_dev[idev];
188  if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
189  ret = AVERROR(errno);
190  av_strerror(ret, errbuf, sizeof(errbuf));
191  av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", errbuf);
192  return ret;
193  }
194 
195  video_buf_size = width * height * 12 / 8;
196 
197  video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
198  PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
199  if (video_buf == MAP_FAILED) {
200  ret = AVERROR(errno);
201  av_strerror(ret, errbuf, sizeof(errbuf));
202  av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", errbuf);
203  return ret;
204  }
205 
206  if (frequency != 0.0) {
207  ioctl_frequency = (unsigned long)(frequency*16);
208  if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
209  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
210  }
211 
212  c = AUDIO_UNMUTE;
213  if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
214  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
215 
216  c = METEOR_CAP_CONTINOUS;
217  ioctl(*video_fd, METEORCAPTUR, &c);
218 
219  c = SIGUSR1;
220  ioctl(*video_fd, METEORSSIGNAL, &c);
221 
222  return 0;
223 }
224 
225 static void bktr_getframe(uint64_t per_frame)
226 {
227  uint64_t curtime;
228 
229  curtime = av_gettime_relative();
230  if (!last_frame_time
231  || ((last_frame_time + per_frame) > curtime)) {
232  if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
233  if (!nsignals)
235  "SLEPT NO signals - %d microseconds late\n",
236  (int)(av_gettime_relative() - last_frame_time - per_frame));
237  }
238  }
239  nsignals = 0;
240  last_frame_time = curtime;
241 }
242 
243 
244 /* note: we support only one picture read at a time */
246 {
247  VideoData *s = s1->priv_data;
248 
249  if (av_new_packet(pkt, video_buf_size) < 0)
250  return AVERROR(EIO);
251 
252  bktr_getframe(s->per_frame);
253 
254  pkt->pts = av_gettime();
255  memcpy(pkt->data, video_buf, video_buf_size);
256 
257  return video_buf_size;
258 }
259 
261 {
262  VideoData *s = s1->priv_data;
263  AVStream *st;
265  int ret = 0;
266 
267  if (!s->framerate)
268  switch (s->standard) {
269  case PAL: s->framerate = av_strdup("pal"); break;
270  case NTSC: s->framerate = av_strdup("ntsc"); break;
271  case SECAM: s->framerate = av_strdup("25"); break;
272  default:
273  av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
274  ret = AVERROR(EINVAL);
275  goto out;
276  }
277  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
278  av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
279  goto out;
280  }
281 
282  st = avformat_new_stream(s1, NULL);
283  if (!st) {
284  ret = AVERROR(ENOMEM);
285  goto out;
286  }
287  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
288 
289  s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
290 
294  st->codecpar->width = s->width;
295  st->codecpar->height = s->height;
297 
298  if (bktr_init(s1->url, s->width, s->height, s->standard,
299  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
300  ret = AVERROR(EIO);
301  goto out;
302  }
303 
304  nsignals = 0;
305  last_frame_time = 0;
306 
307 out:
308  return ret;
309 }
310 
312 {
313  VideoData *s = s1->priv_data;
314  int c;
315 
316  c = METEOR_CAP_STOP_CONT;
317  ioctl(s->video_fd, METEORCAPTUR, &c);
318  close(s->video_fd);
319 
320  c = AUDIO_MUTE;
321  ioctl(s->tuner_fd, BT848_SAUDIO, &c);
322  close(s->tuner_fd);
323 
324  munmap((caddr_t)video_buf, video_buf_size);
325 
326  return 0;
327 }
328 
329 #define OFFSET(x) offsetof(VideoData, x)
330 #define DEC AV_OPT_FLAG_DECODING_PARAM
331 static const AVOption options[] = {
332  { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
333  { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
334  { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
335  { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
336  { "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
337  { "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
338  { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
339  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
340  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
341  { NULL },
342 };
343 
344 static const AVClass bktr_class = {
345  .class_name = "BKTR grab indev",
346  .item_name = av_default_item_name,
347  .option = options,
348  .version = LIBAVUTIL_VERSION_INT,
350 };
351 
353  .name = "bktr",
354  .long_name = NULL_IF_CONFIG_SMALL("video grab"),
355  .priv_data_size = sizeof(VideoData),
359  .flags = AVFMT_NOFILE,
360  .priv_class = &bktr_class,
361 };
bktr_class
static const AVClass bktr_class
Definition: bktr.c:344
av_gettime_relative
int64_t av_gettime_relative(void)
Get the current time in microseconds since some unspecified starting point.
Definition: time.c:56
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:237
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
options
static const AVOption options[]
Definition: bktr.c:331
out
FILE * out
Definition: movenc.c:54
OFFSET
#define OFFSET(x)
Definition: bktr.c:329
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:65
PALM
#define PALM
Definition: bktr.c:72
NTSC_HEIGHT
#define NTSC_HEIGHT
Definition: bktr.c:78
AVPacket::data
uint8_t * data
Definition: packet.h:374
AVOption
AVOption.
Definition: opt.h:251
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:1028
last_frame_time
uint64_t last_frame_time
Definition: bktr.c:89
VideoData::tuner_fd
int tuner_fd
Definition: bktr.c:58
framerate
int framerate
Definition: h264_levels.c:65
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:763
av_strerror
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:108
bktr_init
static av_cold int bktr_init(const char *video_device, int width, int height, int format, int *video_fd, int *tuner_fd, int idev, double frequency)
Definition: bktr.c:99
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:143
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:656
av_cold
#define av_cold
Definition: attributes.h:90
SECAM
#define SECAM
Definition: bktr.c:70
NTSCJ
#define NTSCJ
Definition: bktr.c:73
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:256
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:97
avpriv_open
int avpriv_open(const char *filename, int flags,...)
A wrapper for open() setting O_CLOEXEC.
Definition: file_open.c:67
PALN
#define PALN
Definition: bktr.c:71
format
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:128
s1
#define s1
Definition: regdef.h:38
VIDEO_FORMAT
#define VIDEO_FORMAT
Definition: bktr.c:81
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
bktr_dev
static const int bktr_dev[]
Definition: bktr.c:84
file_open.h
grab_read_packet
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: bktr.c:245
arg
const char * arg
Definition: jacosubdec.c:67
ff_bktr_demuxer
const AVInputFormat ff_bktr_demuxer
Definition: bktr.c:352
AVFormatContext
Format I/O context.
Definition: avformat.h:1216
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:540
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
parseutils.h
time.h
AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
@ AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
Definition: log.h:41
VideoData::per_frame
uint64_t per_frame
Definition: bktr.c:60
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
grab_read_header
static int grab_read_header(AVFormatContext *s1)
Definition: bktr.c:260
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:115
video_buf
uint8_t * video_buf
Definition: bktr.c:87
PAL
#define PAL
Definition: bktr.c:66
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:470
VideoData::height
int height
Definition: bktr.c:59
avdevice.h
height
#define height
NTSC
#define NTSC
Definition: bktr.c:68
VideoData
Definition: bktr.c:55
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
av_parse_video_rate
int av_parse_video_rate(AVRational *rate, const char *arg)
Parse str and store the detected values in *rate.
Definition: parseutils.c:181
VideoData::framerate
char * framerate
Set by a private option.
Definition: bktr.c:62
log.h
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:129
video_buf_size
size_t video_buf_size
Definition: bktr.c:88
VideoData::standard
int standard
Definition: bktr.c:61
AV_OPT_FLAG_DECODING_PARAM
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Definition: opt.h:282
bktr_getframe
static void bktr_getframe(uint64_t per_frame)
Definition: bktr.c:225
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:948
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:71
VideoData::width
int width
Definition: bktr.c:59
PAL_HEIGHT
#define PAL_HEIGHT
Definition: bktr.c:76
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
catchsignal
static void catchsignal(int signal)
Definition: bktr.c:93
VideoData::video_fd
int video_fd
Definition: bktr.c:57
av_gettime
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
DEC
#define DEC
Definition: bktr.c:330
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::format
int format
Definition: codec_par.h:86
grab_read_close
static int grab_read_close(AVFormatContext *s1)
Definition: bktr.c:311
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AVPacket
This structure stores compressed data.
Definition: packet.h:351
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
SECAM_HEIGHT
#define SECAM_HEIGHT
Definition: bktr.c:77
nsignals
volatile sig_atomic_t nsignals
Definition: bktr.c:90
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:234