FFmpeg
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 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/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 const int bktr_dev[] = { METEOR_DEV0, METEOR_DEV1, METEOR_DEV2,
84  METEOR_DEV3, METEOR_DEV_SVIDEO };
85 
86 uint8_t *video_buf;
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, old;
107  int ret;
108  char errbuf[128];
109 
110  if (idev < 0 || idev > 4)
111  {
112  arg = getenv ("BKTR_DEV");
113  if (arg)
114  idev = atoi (arg);
115  if (idev < 0 || idev > 4)
116  idev = 1;
117  }
118 
119  if (format < 1 || format > 6)
120  {
121  arg = getenv ("BKTR_FORMAT");
122  if (arg)
123  format = atoi (arg);
124  if (format < 1 || format > 6)
126  }
127 
128  if (frequency <= 0)
129  {
130  arg = getenv ("BKTR_FREQUENCY");
131  if (arg)
132  frequency = atof (arg);
133  if (frequency <= 0)
134  frequency = 0.0;
135  }
136 
137  memset(&act, 0, sizeof(act));
138  sigemptyset(&act.sa_mask);
139  act.sa_handler = catchsignal;
140  sigaction(SIGUSR1, &act, &old);
141 
142  *tuner_fd = avpriv_open("/dev/tuner0", O_RDONLY);
143  if (*tuner_fd < 0)
144  av_log(NULL, AV_LOG_ERROR, "Warning. Tuner not opened, continuing: %s\n", strerror(errno));
145 
146  *video_fd = avpriv_open(video_device, O_RDONLY);
147  if (*video_fd < 0) {
148  ret = AVERROR(errno);
149  av_strerror(ret, errbuf, sizeof(errbuf));
150  av_log(NULL, AV_LOG_ERROR, "%s: %s\n", video_device, errbuf);
151  return ret;
152  }
153 
154  geo.rows = height;
155  geo.columns = width;
156  geo.frames = 1;
157  geo.oformat = METEOR_GEO_YUV_422 | METEOR_GEO_YUV_12;
158 
159  switch (format) {
160  case PAL: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
161  case PALN: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALN; break;
162  case PALM: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALM; break;
163  case SECAM: h_max = SECAM_HEIGHT; c = BT848_IFORM_F_SECAM; break;
164  case NTSC: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCM; break;
165  case NTSCJ: h_max = NTSC_HEIGHT; c = BT848_IFORM_F_NTSCJ; break;
166  default: h_max = PAL_HEIGHT; c = BT848_IFORM_F_PALBDGHI; break;
167  }
168 
169  if (height <= h_max / 2)
170  geo.oformat |= METEOR_GEO_EVEN_ONLY;
171 
172  if (ioctl(*video_fd, METEORSETGEO, &geo) < 0) {
173  ret = AVERROR(errno);
174  av_strerror(ret, errbuf, sizeof(errbuf));
175  av_log(NULL, AV_LOG_ERROR, "METEORSETGEO: %s\n", errbuf);
176  return ret;
177  }
178 
179  if (ioctl(*video_fd, BT848SFMT, &c) < 0) {
180  ret = AVERROR(errno);
181  av_strerror(ret, errbuf, sizeof(errbuf));
182  av_log(NULL, AV_LOG_ERROR, "BT848SFMT: %s\n", errbuf);
183  return ret;
184  }
185 
186  c = bktr_dev[idev];
187  if (ioctl(*video_fd, METEORSINPUT, &c) < 0) {
188  ret = AVERROR(errno);
189  av_strerror(ret, errbuf, sizeof(errbuf));
190  av_log(NULL, AV_LOG_ERROR, "METEORSINPUT: %s\n", errbuf);
191  return ret;
192  }
193 
194  video_buf_size = width * height * 12 / 8;
195 
196  video_buf = (uint8_t *)mmap((caddr_t)0, video_buf_size,
197  PROT_READ, MAP_SHARED, *video_fd, (off_t)0);
198  if (video_buf == MAP_FAILED) {
199  ret = AVERROR(errno);
200  av_strerror(ret, errbuf, sizeof(errbuf));
201  av_log(NULL, AV_LOG_ERROR, "mmap: %s\n", errbuf);
202  return ret;
203  }
204 
205  if (frequency != 0.0) {
206  ioctl_frequency = (unsigned long)(frequency*16);
207  if (ioctl(*tuner_fd, TVTUNER_SETFREQ, &ioctl_frequency) < 0)
208  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SETFREQ: %s\n", strerror(errno));
209  }
210 
211  c = AUDIO_UNMUTE;
212  if (ioctl(*tuner_fd, BT848_SAUDIO, &c) < 0)
213  av_log(NULL, AV_LOG_ERROR, "TVTUNER_SAUDIO: %s\n", strerror(errno));
214 
215  c = METEOR_CAP_CONTINOUS;
216  ioctl(*video_fd, METEORCAPTUR, &c);
217 
218  c = SIGUSR1;
219  ioctl(*video_fd, METEORSSIGNAL, &c);
220 
221  return 0;
222 }
223 
224 static void bktr_getframe(uint64_t per_frame)
225 {
226  uint64_t curtime;
227 
228  curtime = av_gettime_relative();
229  if (!last_frame_time
230  || ((last_frame_time + per_frame) > curtime)) {
231  if (!usleep(last_frame_time + per_frame + per_frame / 8 - curtime)) {
232  if (!nsignals)
234  "SLEPT NO signals - %d microseconds late\n",
235  (int)(av_gettime_relative() - last_frame_time - per_frame));
236  }
237  }
238  nsignals = 0;
239  last_frame_time = curtime;
240 }
241 
242 
243 /* note: we support only one picture read at a time */
245 {
246  VideoData *s = s1->priv_data;
247 
248  if (av_new_packet(pkt, video_buf_size) < 0)
249  return AVERROR(EIO);
250 
251  bktr_getframe(s->per_frame);
252 
253  pkt->pts = av_gettime();
254  memcpy(pkt->data, video_buf, video_buf_size);
255 
256  return video_buf_size;
257 }
258 
260 {
261  VideoData *s = s1->priv_data;
262  AVStream *st;
264  int ret = 0;
265 
266  if (!s->framerate)
267  switch (s->standard) {
268  case PAL: s->framerate = av_strdup("pal"); break;
269  case NTSC: s->framerate = av_strdup("ntsc"); break;
270  case SECAM: s->framerate = av_strdup("25"); break;
271  default:
272  av_log(s1, AV_LOG_ERROR, "Unknown standard.\n");
273  ret = AVERROR(EINVAL);
274  goto out;
275  }
276  if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) {
277  av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", s->framerate);
278  goto out;
279  }
280 
281  st = avformat_new_stream(s1, NULL);
282  if (!st) {
283  ret = AVERROR(ENOMEM);
284  goto out;
285  }
286  avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in use */
287 
288  s->per_frame = ((uint64_t)1000000 * framerate.den) / framerate.num;
289 
293  st->codecpar->width = s->width;
294  st->codecpar->height = s->height;
296 
297  if (bktr_init(s1->url, s->width, s->height, s->standard,
298  &s->video_fd, &s->tuner_fd, -1, 0.0) < 0) {
299  ret = AVERROR(EIO);
300  goto out;
301  }
302 
303  nsignals = 0;
304  last_frame_time = 0;
305 
306 out:
307  return ret;
308 }
309 
311 {
312  VideoData *s = s1->priv_data;
313  int c;
314 
315  c = METEOR_CAP_STOP_CONT;
316  ioctl(s->video_fd, METEORCAPTUR, &c);
317  close(s->video_fd);
318 
319  c = AUDIO_MUTE;
320  ioctl(s->tuner_fd, BT848_SAUDIO, &c);
321  close(s->tuner_fd);
322 
323  munmap((caddr_t)video_buf, video_buf_size);
324 
325  return 0;
326 }
327 
328 #define OFFSET(x) offsetof(VideoData, x)
329 #define DEC AV_OPT_FLAG_DECODING_PARAM
330 static const AVOption options[] = {
331  { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_FORMAT}, PAL, NTSCJ, AV_OPT_FLAG_DECODING_PARAM, "standard" },
332  { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
333  { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
334  { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
335  { "PALN", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALN}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
336  { "PALM", "", 0, AV_OPT_TYPE_CONST, {.i64 = PALM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
337  { "NTSCJ", "", 0, AV_OPT_TYPE_CONST, {.i64 = NTSCJ}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
338  { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = "vga"}, 0, 0, DEC },
339  { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
340  { NULL },
341 };
342 
343 static const AVClass bktr_class = {
344  .class_name = "BKTR grab indev",
345  .item_name = av_default_item_name,
346  .option = options,
347  .version = LIBAVUTIL_VERSION_INT,
349 };
350 
352  .name = "bktr",
353  .long_name = NULL_IF_CONFIG_SMALL("video grab"),
354  .priv_data_size = sizeof(VideoData),
358  .flags = AVFMT_NOFILE,
359  .priv_class = &bktr_class,
360 };
bktr_class
static const AVClass bktr_class
Definition: bktr.c:343
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: utils.c:4375
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
options
static const AVOption options[]
Definition: bktr.c:330
out
FILE * out
Definition: movenc.c:54
OFFSET
#define OFFSET(x)
Definition: bktr.c:328
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:63
PALM
#define PALM
Definition: bktr.c:71
NTSC_HEIGHT
#define NTSC_HEIGHT
Definition: bktr.c:77
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVOption
AVOption.
Definition: opt.h:247
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:914
last_frame_time
uint64_t last_frame_time
Definition: bktr.c:88
VideoData::tuner_fd
int tuner_fd
Definition: bktr.c:57
framerate
int framerate
Definition: h264_levels.c:65
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:105
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:98
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
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:626
av_cold
#define av_cold
Definition: attributes.h:90
SECAM
#define SECAM
Definition: bktr.c:69
NTSCJ
#define NTSCJ
Definition: bktr.c:72
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:257
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:99
avpriv_open
int avpriv_open(const char *filename, int flags,...)
A wrapper for open() setting O_CLOEXEC.
Definition: file_open.c:66
PALN
#define PALN
Definition: bktr.c:70
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
s1
#define s1
Definition: regdef.h:38
VIDEO_FORMAT
#define VIDEO_FORMAT
Definition: bktr.c:80
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:83
grab_read_packet
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: bktr.c:244
arg
const char * arg
Definition: jacosubdec.c:67
ff_bktr_demuxer
const AVInputFormat ff_bktr_demuxer
Definition: bktr.c:351
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
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:234
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
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:59
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:259
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:116
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4800
video_buf
uint8_t * video_buf
Definition: bktr.c:86
PAL
#define PAL
Definition: bktr.c:65
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:463
VideoData::height
int height
Definition: bktr.c:58
avdevice.h
height
#define height
NTSC
#define NTSC
Definition: bktr.c:67
VideoData
Definition: bktr.c:54
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:179
VideoData::framerate
char * framerate
Set by a private option.
Definition: bktr.c:61
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:366
internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:127
video_buf_size
size_t video_buf_size
Definition: bktr.c:87
VideoData::standard
int standard
Definition: bktr.c:60
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:278
bktr_getframe
static void bktr_getframe(uint64_t per_frame)
Definition: bktr.c:224
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:847
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:58
PAL_HEIGHT
#define PAL_HEIGHT
Definition: bktr.c:75
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
catchsignal
static void catchsignal(int signal)
Definition: bktr.c:92
VideoData::video_fd
int video_fd
Definition: bktr.c:56
av_gettime
int64_t av_gettime(void)
Get the current time in microseconds.
Definition: time.c:39
DEC
#define DEC
Definition: bktr.c:329
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:259
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::format
int format
Definition: codec_par.h:84
grab_read_close
static int grab_read_close(AVFormatContext *s1)
Definition: bktr.c:310
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
format
fg outputs[0] format
Definition: ffmpeg_filter.c:175
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
SECAM_HEIGHT
#define SECAM_HEIGHT
Definition: bktr.c:76
nsignals
volatile sig_atomic_t nsignals
Definition: bktr.c:89
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:228
AV_OPT_TYPE_CONST
@ AV_OPT_TYPE_CONST
Definition: opt.h:233