1 |
=head1 NAME |
2 |
|
3 |
Linux::DVB - interface to (some parts of) the Linux DVB API |
4 |
|
5 |
=head1 SYNOPSIS |
6 |
|
7 |
use Linux::DVB; |
8 |
|
9 |
=head1 DESCRIPTION |
10 |
|
11 |
This module provides an interface to the Linux DVB API. It is a straightforward |
12 |
translation of the C API. You should read the Linux DVB API description to make |
13 |
any sense of this module. It can be found here: |
14 |
|
15 |
http://www.linuxtv.org/docs/dvbapi/dvbapi.html |
16 |
|
17 |
All constants from F<frontend.h> and F<demux.h> are exported by their C |
18 |
name and by default. |
19 |
|
20 |
Noteworthy differences to the C API: unions and sub-structs are usually |
21 |
translated into flat perl hashes, i.e C<struct.u.qam.symbol_rate> |
22 |
becomes C<< $struct->{symbol_rate} >>. |
23 |
|
24 |
Noteworthy limitations of this module include: No interface to the video, |
25 |
audio and net devices. If you need this functionality bug the author. |
26 |
|
27 |
=cut |
28 |
|
29 |
package Linux::DVB; |
30 |
|
31 |
use Fcntl (); |
32 |
|
33 |
BEGIN { |
34 |
$VERSION = '1.0'; |
35 |
@ISA = qw(Exporter); |
36 |
|
37 |
require XSLoader; |
38 |
XSLoader::load __PACKAGE__, $VERSION; |
39 |
|
40 |
require Exporter; |
41 |
|
42 |
my %consts = &_consts; |
43 |
my $consts; |
44 |
while (my ($k, $v) = each %consts) { |
45 |
push @EXPORT, $k; |
46 |
$consts .= "sub $k(){$v}\n"; |
47 |
} |
48 |
eval $consts; |
49 |
} |
50 |
|
51 |
sub new { |
52 |
my ($class, $path, $mode) = @_; |
53 |
|
54 |
my $self = bless { path => $path, mode => $mode }, $class; |
55 |
sysopen $self->{fh}, $path, $mode | &Fcntl::O_NONBLOCK |
56 |
or die "$path: $!"; |
57 |
$self->{fd} = fileno $self->{fh}; |
58 |
|
59 |
$self; |
60 |
} |
61 |
|
62 |
sub fh { $_[0]{fh} } |
63 |
sub fd { $_[0]{fd} } |
64 |
|
65 |
sub blocking { |
66 |
fcntl $_[0]{fh}, &Fcntl::F_SETFL, $_[1] ? 0 : &Fcntl::O_NONBLOCK; |
67 |
} |
68 |
|
69 |
package Linux::DVB::Frontend; |
70 |
|
71 |
@ISA = qw(Linux::DVB); |
72 |
|
73 |
=head1 Linux::DVB::Frontend CLASS |
74 |
|
75 |
=head2 SYNOPSIS |
76 |
|
77 |
my $fe = new Linux::DVB::Frontend $path, $writable; |
78 |
|
79 |
my $fe = new Linux::DVB::Frontend |
80 |
"/dev/dvb/adapter0/frontend0", 1; |
81 |
|
82 |
$fe->fh; # filehandle |
83 |
$fe->fd; # fileno |
84 |
$fe->blocking (0); # or 1 |
85 |
|
86 |
$fe->{name} |
87 |
$fe->{type} |
88 |
$fe->frontend_info->{name} |
89 |
|
90 |
$fe->status & FE_HAS_LOCK |
91 |
print $fe->ber, $fe->snr, $fe->signal_strength, $fe->uncorrected; |
92 |
|
93 |
my $tune = $fe->parameters; |
94 |
$tune->{frequency}; |
95 |
$tune->{symbol_rate}; |
96 |
|
97 |
=over 4 |
98 |
|
99 |
=cut |
100 |
|
101 |
sub new { |
102 |
my ($class, $path, $mode) = @_; |
103 |
my $self = $class->SUPER::new ($path, $mode ? &Fcntl::O_RDWR : &Fcntl::O_RDONLY); |
104 |
|
105 |
%$self = ( %$self, %{ $self->frontend_info } ); |
106 |
|
107 |
$self; |
108 |
} |
109 |
|
110 |
=item $fe->set (parameter => value, ...) |
111 |
|
112 |
Sets frontend parameters. All values are stuffed into the |
113 |
C<dvb_frontend_parameters> structure without conversion and passed to |
114 |
FE_SET_FRONTEND. |
115 |
|
116 |
Returns true on success. |
117 |
|
118 |
All modes: |
119 |
|
120 |
frequency => |
121 |
inversion => |
122 |
|
123 |
QPSK frontends: |
124 |
|
125 |
symbol_rate => |
126 |
fec_inner => |
127 |
|
128 |
QAM frontends: |
129 |
|
130 |
symbol_rate => |
131 |
modulation => |
132 |
|
133 |
QFDM frontends: |
134 |
|
135 |
bandwidth => |
136 |
code_rate_HP => |
137 |
code_rate_LP => |
138 |
constellation => |
139 |
transmission_mode => |
140 |
|
141 |
=cut |
142 |
|
143 |
sub set { |
144 |
my ($self) = shift; |
145 |
_set $self->{fd}, { @_ }, $self->{type} |
146 |
} |
147 |
|
148 |
=item $fe->parameters |
149 |
|
150 |
Calls FE_GET_FRONTEND and returns a hash reference that contains the same keys |
151 |
as given to the C<set> method. |
152 |
|
153 |
Example: |
154 |
|
155 |
Data::Dumper::Dumper $fe->get |
156 |
|
157 |
{ |
158 |
frequency => 426000000, # 426 Mhz |
159 |
inversion => 0, # INVERSION_OFF |
160 |
symbol_rate => 6900000, # 6.9 MB/s |
161 |
modulation => 3, # QAM_64 |
162 |
} |
163 |
|
164 |
=cut |
165 |
|
166 |
sub parameters { _get ($_[0]{fd}, $_[0]{type}) } |
167 |
sub get { _get ($_[0]{fd}, $_[0]{type}) } # unannounced alias |
168 |
sub event { _event ($_[0]{fd}, $_[0]{type}) } |
169 |
|
170 |
=item $ok = $fe->diseqc_reset_overload |
171 |
|
172 |
If the bus has been automatically powered off due to power overload, this |
173 |
call restores the power to the bus. The call requires read/write access |
174 |
to the device. This call has no effect if the device is manually powered |
175 |
off. Not all DVB adapters support this call. |
176 |
|
177 |
=item $ok = $fe->diseqc_voltage (13|18) |
178 |
|
179 |
Set the DiSEqC voltage to either 13 or 18 volts. |
180 |
|
181 |
=item $ok = $fe->diseqc_tone (1|0) |
182 |
|
183 |
Enables (1) or disables (0) the DiSEqC continuous 22khz tone generation. |
184 |
|
185 |
=item $ok = $fe->diseqc_send_burst (0|1) |
186 |
|
187 |
Sends a 22KHz tone burst of type SEC_MINI_A (0) or SEC_MINI_B (1). |
188 |
|
189 |
=item $ok = $fe->diseqc_cmd ($command) |
190 |
|
191 |
Sends a DiSEqC command. |
192 |
|
193 |
=item $reply = $fe->diseqc_reply ($timeout) |
194 |
|
195 |
Receives a reply to a DiSEqC 2.0 command (or undef). |
196 |
|
197 |
=cut |
198 |
|
199 |
package Linux::DVB::Demux; |
200 |
|
201 |
@ISA = qw(Linux::DVB); |
202 |
|
203 |
=back |
204 |
|
205 |
=head1 Linux::DVB::Demux CLASS |
206 |
|
207 |
=head2 SYNOPSIS |
208 |
|
209 |
my $dmx = new Linux::DVB::Demux |
210 |
"/dev/dvb/adapter0/demux0"; |
211 |
|
212 |
$fe->fh; # filehandle |
213 |
$fe->fd; # fileno |
214 |
$fe->blocking (1); # non-blocking is default |
215 |
|
216 |
$dmx->buffer (16384); |
217 |
$dmx->sct_filter ($pid, "filter", "mask", $timeout=0, $flags=DMX_CHECK_CRC); |
218 |
$dmx->pes_filter ($pid, $input, $output, $type, $flags=0); |
219 |
$dmx->start; |
220 |
$dmx->stop; |
221 |
|
222 |
=over 4 |
223 |
|
224 |
=cut |
225 |
|
226 |
sub new { |
227 |
my ($class, $path) = @_; |
228 |
my $self = $class->SUPER::new ($path, &Fcntl::O_RDWR); |
229 |
|
230 |
$self; |
231 |
} |
232 |
|
233 |
sub start { _start ($_[0]{fd}) } |
234 |
sub stop { _stop ($_[0]{fd}) } |
235 |
|
236 |
sub sct_filter { _filter ($_[0]{fd}, @_[1, 2, 3, 4, 5]) } |
237 |
sub pes_filter { _pes_filter ($_[0]{fd}, @_[1, 2, 3, 4, 5]) } |
238 |
sub buffer { _buffer ($_[0]{fd}, $_[1]) } |
239 |
|
240 |
package Linux::DVB::Decode; |
241 |
|
242 |
=back |
243 |
|
244 |
=head1 Linux::DVB::Decode CLASS |
245 |
|
246 |
=head2 SYNOPSIS |
247 |
|
248 |
$si_decoded_hashref = Linux::DVB::Decode::si $section_data; |
249 |
|
250 |
=over 4 |
251 |
|
252 |
=cut |
253 |
|
254 |
=item $hashref = Linux::DVB::Decode::si $section_data |
255 |
|
256 |
Tries to parse the string inside C<$section_data> as an SI table and |
257 |
return it as a hash reference. Only the first SI table will be returned |
258 |
as hash reference, and the C<$section_data> will be modified in-place by |
259 |
removing the table data. |
260 |
|
261 |
The way to use this function is to append new data to your |
262 |
C<$section_data> and then call C<Linux::DVB::Decode::si> in a loop until |
263 |
it returns C<undef>. Please ntoe, however, that the Linux DVB API will |
264 |
return only one table at a time from sysread, so you can safely assume |
265 |
that every sysread will return exactly one (or zero in case of errors) SI |
266 |
table. |
267 |
|
268 |
Here is an example of what to expect: |
269 |
|
270 |
{ |
271 |
'segment_last_section_number' => 112, |
272 |
'table_id' => 81, |
273 |
'service_id' => 28129, |
274 |
'original_network_id' => 1, |
275 |
'section_syntax_indicator' => 1, |
276 |
'current_next_indicator' => 1, |
277 |
'events' => [ |
278 |
{ |
279 |
'running_status' => 0, |
280 |
'start_time_hms' => 2097152, |
281 |
'event_id' => 39505, |
282 |
'free_CA_mode' => 0, |
283 |
'start_time_mjd' => 53470, |
284 |
'descriptors' => [ |
285 |
{ |
286 |
'event_name' => 'Nachrichten', |
287 |
'text' => '', |
288 |
'ISO_639_language_code' => 'deu', |
289 |
'type' => 77 |
290 |
}, |
291 |
{ |
292 |
'programme_identification_label' => 337280, |
293 |
'type' => 105 |
294 |
}, |
295 |
{ |
296 |
'raw_data' => '22:0010.04#00', |
297 |
'type' => 130 |
298 |
} |
299 |
], |
300 |
'duration' => 1280 |
301 |
}, |
302 |
{ |
303 |
'running_status' => 0, |
304 |
'start_time_hms' => 2098432, |
305 |
'event_id' => 39506, |
306 |
'free_CA_mode' => 0, |
307 |
'start_time_mjd' => 53470, |
308 |
'descriptors' => [ |
309 |
{ |
310 |
'event_name' => 'SR 1 - Nachtwerk', |
311 |
'text' => '', |
312 |
'ISO_639_language_code' => 'deu', |
313 |
'type' => 77 |
314 |
}, |
315 |
{ |
316 |
'programme_identification_label' => 337285, |
317 |
'type' => 105 |
318 |
}, |
319 |
{ |
320 |
'raw_data' => '22:0510.04#00', |
321 |
'type' => 130 |
322 |
} |
323 |
], |
324 |
'duration' => 87296 |
325 |
} |
326 |
], |
327 |
'last_table_id' => 81, |
328 |
'section_number' => 112, |
329 |
'last_section_number' => 176, |
330 |
'version_number' => 31, |
331 |
'transport_stream_id' => 1101 |
332 |
} |
333 |
|
334 |
|
335 |
=item $text = Linux::DVB::Decode::text $data |
336 |
|
337 |
Converts text found in DVB si tables into perl text. Only iso-8859-1..-11 |
338 |
and UTF-16 is supported, other encodings (big5 etc. is not. Bug me if you |
339 |
need this). |
340 |
|
341 |
=cut |
342 |
|
343 |
sub text($) { |
344 |
use Encode; |
345 |
|
346 |
for ($_[0]) { |
347 |
s/^([\x01-\x0b])// and $_ = decode sprintf ("iso-8859-%d", 4 + ord $1), $_; |
348 |
# 10 - pardon you??? |
349 |
s/^\x11// and $_ = decode "utf16-be", $_; |
350 |
# 12 ksc5601, DB |
351 |
# 13 db2312, DB |
352 |
# 14 big5(?), DB |
353 |
s/\x8a/\n/g; |
354 |
#s/([\x00-\x09\x0b-\x1f\x80-\x9f])/sprintf "{%02x}", ord $1/ge; |
355 |
s/([\x00-\x09\x0b-\x1f\x80-\x9f])//ge; |
356 |
} |
357 |
} |
358 |
|
359 |
=item %Linux::DVB::Decode::nibble_to_genre |
360 |
|
361 |
A two-level hash mapping genre nibbles to genres, e.g. |
362 |
|
363 |
$Linux::DVB::Decode::nibble_to_genre{7}{6} |
364 |
=> 'film/cinema' |
365 |
|
366 |
=cut |
367 |
|
368 |
our %nibble_to_genre = ( |
369 |
0x1 => { |
370 |
0x0 => 'Movie/Drama (general)', |
371 |
0x1 => 'Movie - detective/thriller', |
372 |
0x2 => 'Movie - adventure/western/war', |
373 |
0x3 => 'Movie - science fiction/fantasy/horror', |
374 |
0x4 => 'Movie - comedy', |
375 |
0x5 => 'Movie - soap/melodrama/folkloric', |
376 |
0x6 => 'Movie - romance', |
377 |
0x7 => 'Movie - serious/classical/religious/historical movie/drama', |
378 |
0x8 => 'Movie - adult movie/drama', |
379 |
}, |
380 |
0x2 => { |
381 |
0x0 => 'News/Current Affairs (general)', |
382 |
0x1 => 'news/weather report', |
383 |
0x2 => 'news magazine', |
384 |
0x3 => 'documentary', |
385 |
0x4 => 'discussion/interview/debate', |
386 |
}, |
387 |
0x3 => { |
388 |
0x0 => 'Show/Game Show (general)', |
389 |
0x1 => 'game show/quiz/contest', |
390 |
0x2 => 'variety show', |
391 |
0x3 => 'talk show', |
392 |
}, |
393 |
0x4 => { |
394 |
0x0 => 'Sports (general)', |
395 |
0x1 => 'special events (Olympic Games, World Cup etc.)', |
396 |
0x2 => 'sports magazines', |
397 |
0x3 => 'football/soccer', |
398 |
0x4 => 'tennis/squash', |
399 |
0x5 => 'team sports (excluding football)', |
400 |
0x6 => 'athletics', |
401 |
0x7 => 'motor sport', |
402 |
0x8 => 'water sport', |
403 |
0x9 => 'winter sports', |
404 |
0xA => 'equestrian', |
405 |
0xB => 'martial sports', |
406 |
}, |
407 |
0x5 => { |
408 |
0x0 => 'Childrens/Youth (general)', |
409 |
0x1 => "pre-school children's programmes", |
410 |
0x2 => 'entertainment programmes for 6 to 14', |
411 |
0x3 => 'entertainment programmes for 10 to 16', |
412 |
0x4 => 'informational/educational/school programmes', |
413 |
0x5 => 'cartoons/puppets', |
414 |
}, |
415 |
0x6 => { |
416 |
0x0 => 'Music/Ballet/Dance (general)', |
417 |
0x1 => 'rock/pop', |
418 |
0x2 => 'serious music or classical music', |
419 |
0x3 => 'folk/traditional music', |
420 |
0x4 => 'jazz', |
421 |
0x5 => 'musical/opera', |
422 |
0x6 => 'ballet', |
423 |
}, |
424 |
0x7 => { |
425 |
0x0 => 'Arts/Culture (without music, general)', |
426 |
0x1 => 'performing arts', |
427 |
0x2 => 'fine arts', |
428 |
0x3 => 'religion', |
429 |
0x4 => 'popular culture/traditional arts', |
430 |
0x5 => 'literature', |
431 |
0x6 => 'film/cinema', |
432 |
0x7 => 'experimental film/video', |
433 |
0x8 => 'broadcasting/press', |
434 |
0x9 => 'new media', |
435 |
0xA => 'arts/culture magazines', |
436 |
0xB => 'fashion', |
437 |
}, |
438 |
0x8 => { |
439 |
0x0 => 'Social/Policical/Economics (general)', |
440 |
0x1 => 'magazines/reports/documentary', |
441 |
0x2 => 'economics/social advisory', |
442 |
0x3 => 'remarkable people', |
443 |
}, |
444 |
0x9 => { |
445 |
0x0 => 'Education/Science/Factual (general)', |
446 |
0x1 => 'nature/animals/environment', |
447 |
0x2 => 'technology/natural sciences', |
448 |
0x3 => 'medicine/physiology/psychology', |
449 |
0x4 => 'foreign countries/expeditions', |
450 |
0x5 => 'social/spiritual sciences', |
451 |
0x6 => 'further education', |
452 |
0x7 => 'languages', |
453 |
}, |
454 |
0xA => { |
455 |
0x0 => 'Leisure/Hobbies (general)', |
456 |
0x1 => 'tourism/travel', |
457 |
0x2 => 'handicraft', |
458 |
0x3 => 'motoring', |
459 |
0x4 => 'fitness & health', |
460 |
0x5 => 'cooking', |
461 |
0x6 => 'advertizement/shopping', |
462 |
0x7 => 'gardening', |
463 |
}, |
464 |
0xB => { |
465 |
0x0 => '(original language)', |
466 |
0x1 => '(black & white)', |
467 |
0x2 => '(unpublished)', |
468 |
0x3 => '(live broadcast)', |
469 |
}, |
470 |
); |
471 |
|
472 |
=item ($sec,$min,$hour) = Linux::DVB::Decode::time $hms |
473 |
|
474 |
=item ($mday,$mon,$year) = Linux::DVB::Decode::date $mjd |
475 |
|
476 |
=item ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::datetime $mjd, $hms |
477 |
|
478 |
=item $sec = Linux::DVB::Decode::time_linear $hms |
479 |
|
480 |
=item $sec = Linux::DVB::Decode::datetime_linear $mjd, $hms |
481 |
|
482 |
Break down a "DVB time" (modified julian date + bcd encoded seconds) into |
483 |
it's components (non-C<_linear>) or into a seconds count (C<_linear> |
484 |
variants) since the epoch (C<datetime_linear>) or the start of the day |
485 |
(C<time_linear>). |
486 |
|
487 |
The format of the returns value of the date and datetime functions is |
488 |
I<not> compatible with C<Time::Local>. Use the C<_linear> functions |
489 |
instead. |
490 |
|
491 |
Example: |
492 |
|
493 |
my $time = Linux::DVB::Decode::datetime_linear $mjd, $hms |
494 |
printf "Starts at %s\n", |
495 |
POSIX::strftime "%Y-%m-%d %H:%M:%S", |
496 |
localtime $time; |
497 |
|
498 |
=cut |
499 |
|
500 |
sub time($) { |
501 |
my ($time) = @_; |
502 |
|
503 |
# Time is in UTC, 24 bit, every nibble one digit in BCD from right to left |
504 |
my $hour = sprintf "%02x", ($time >> 16) & 0xFF; |
505 |
my $minute = sprintf "%02x", ($time >> 8) & 0xFF; |
506 |
my $second = sprintf "%02x", ($time ) & 0xFF; |
507 |
|
508 |
($second, $minute, $hour) |
509 |
} |
510 |
|
511 |
sub date($) { |
512 |
my ($mjd) = @_; |
513 |
|
514 |
# Date is given in Modified Julian Date |
515 |
# Decoding routines taken from ANNEX C, ETSI EN 300 468 (DVB SI) |
516 |
my $y_ = int (($mjd - 15078.2) / 365.25); |
517 |
my $m_ = int (($mjd - 14956.1 - int ($y_ * 365.25)) / 30.6001); |
518 |
my $day = $mjd - 14956 - int ($y_ * 365.25) - int ($m_ * 30.6001); |
519 |
my $k = $m_ == 14 or $m_ == 15 ? 1 : 0; |
520 |
my $year = $y_ + $k + 1900; |
521 |
my $month = $m_ - 1 - $k * 12; |
522 |
|
523 |
($day, $month, $year) |
524 |
} |
525 |
|
526 |
sub datetime($$) { |
527 |
(Linux::DVB::Decode::time $_[1], date $_[0]) |
528 |
} |
529 |
|
530 |
sub time_linear($) { |
531 |
my ($s, $m, $h) = Linux::DVB::Decode::time $_[0]; |
532 |
|
533 |
(($h * 60) + $m * 60) + $s |
534 |
} |
535 |
|
536 |
sub datetime_linear($$) { |
537 |
my ($sec, $min, $hour, $mday, $mon, $year) = |
538 |
Linux::DVB::Decode::datetime $_[0], $_[1]; |
539 |
|
540 |
require Time::Local; |
541 |
Time::Local::timegm ($sec, $min, $hour, $mday, $mon - 1, $year) |
542 |
} |
543 |
|
544 |
=back |
545 |
|
546 |
=head1 AUTHORS |
547 |
|
548 |
Marc Lehmann <schmorp@schmorp.de>, http://home.schmorp.de/ |
549 |
Magnus Schmidt, eMail at http://www.27b-6.de/email.php |
550 |
|
551 |
=cut |
552 |
|
553 |
1 |