| 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 way to set the |
| 25 |
frequency or diseqc. No interface to the video, audio and net devices. |
| 26 |
If you need this functionality bug the author. |
| 27 |
|
| 28 |
=cut |
| 29 |
|
| 30 |
package Linux::DVB; |
| 31 |
|
| 32 |
use Fcntl (); |
| 33 |
|
| 34 |
BEGIN { |
| 35 |
$VERSION = '0.4'; |
| 36 |
@ISA = qw(Exporter); |
| 37 |
|
| 38 |
require XSLoader; |
| 39 |
XSLoader::load __PACKAGE__, $VERSION; |
| 40 |
|
| 41 |
require Exporter; |
| 42 |
|
| 43 |
my %consts = &_consts; |
| 44 |
my $consts; |
| 45 |
while (my ($k, $v) = each %consts) { |
| 46 |
push @EXPORT, $k; |
| 47 |
$consts .= "sub $k(){$v}\n"; |
| 48 |
} |
| 49 |
eval $consts; |
| 50 |
} |
| 51 |
|
| 52 |
sub new { |
| 53 |
my ($class, $path, $mode) = @_; |
| 54 |
|
| 55 |
my $self = bless { path => $path, mode => $mode }, $class; |
| 56 |
sysopen $self->{fh}, $path, $mode | &Fcntl::O_NONBLOCK |
| 57 |
or die "$path: $!"; |
| 58 |
$self->{fd} = fileno $self->{fh}; |
| 59 |
|
| 60 |
$self; |
| 61 |
} |
| 62 |
|
| 63 |
sub fh { $_[0]{fh} } |
| 64 |
sub fd { $_[0]{fd} } |
| 65 |
|
| 66 |
sub blocking { |
| 67 |
fcntl $_[0]{fh}, &Fcntl::F_SETFL, $_[1] ? 0 : &Fcntl::O_NONBLOCK; |
| 68 |
} |
| 69 |
|
| 70 |
package Linux::DVB::Frontend; |
| 71 |
|
| 72 |
@ISA = qw(Linux::DVB); |
| 73 |
|
| 74 |
=head1 Linux::DVB::Frontend CLASS |
| 75 |
|
| 76 |
=head2 SYNOPSIS |
| 77 |
|
| 78 |
my $fe = new Linux::DVB::Frontend $path, $writable; |
| 79 |
|
| 80 |
my $fe = new Linux::DVB::Frontend |
| 81 |
"/dev/dvb/adapter0/frontend0", 1; |
| 82 |
|
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$fe->fh; # filehandle |
| 84 |
$fe->fd; # fileno |
| 85 |
$fe->blocking (0); # or 1 |
| 86 |
|
| 87 |
$fe->{name} |
| 88 |
$fe->{type} |
| 89 |
$fe->frontend_info->{name} |
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|
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$fe->status & FE_HAS_LOCK |
| 92 |
print $fe->ber, $fe->snr, $fe->signal_strength, $fe->uncorrected; |
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|
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my $tune = $fe->parameters; |
| 95 |
$tune->{frequency}; |
| 96 |
$tune->{symbol_rate}; |
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|
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=over 4 |
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|
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=cut |
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|
| 102 |
sub new { |
| 103 |
my ($class, $path, $mode) = @_; |
| 104 |
my $self = $class->SUPER::new ($path, $mode ? &Fcntl::O_RDWR : &Fcntl::O_RDONLY); |
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|
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%$self = ( %$self, %{ $self->frontend_info } ); |
| 107 |
|
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$self; |
| 109 |
} |
| 110 |
|
| 111 |
sub frontend_info { _frontend_info ($_[0]{fd}) } |
| 112 |
sub status { _read_status ($_[0]{fd}) } |
| 113 |
sub ber { _read_ber ($_[0]{fd}) } |
| 114 |
sub snr { _snr ($_[0]{fd}) } |
| 115 |
sub signal_strength { _signal_strength ($_[0]{fd}) } |
| 116 |
sub uncorrected { _uncorrected ($_[0]{fd}) } |
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|
| 118 |
=item $fe->set (parameter => value, ...) |
| 119 |
|
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Sets frontend parameters. All values are stuffed into the |
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C<dvb_frontend_parameters> structure without conversion and passed to |
| 122 |
FE_SET_FRONTEND. |
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|
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Returns true on success. |
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|
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All modes: |
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|
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frequency => |
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inversion => |
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|
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QPSK frontends: |
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|
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symbol_rate => |
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fec_inner => |
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|
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QAM frontends: |
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|
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symbol_rate => |
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modulation => |
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|
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QFDM frontends: |
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|
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bandwidth => |
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code_rate_HP => |
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code_rate_LP => |
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constellation => |
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transmission_mode => |
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|
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=cut |
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|
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sub set { |
| 152 |
my ($self) = shift; |
| 153 |
_set $self->{fd}, { @_ }, $self->{type} |
| 154 |
} |
| 155 |
|
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=item $fe->parameters |
| 157 |
|
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Calls FE_GET_FRONTEND and returns a hash reference that contains the same keys |
| 159 |
as given to the C<set> method. |
| 160 |
|
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Example: |
| 162 |
|
| 163 |
Data::Dumper::Dumper $fe->get |
| 164 |
|
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{ |
| 166 |
frequency => 426000000, # 426 Mhz |
| 167 |
inversion => 0, # INVERSION_OFF |
| 168 |
symbol_rate => 6900000, # 6.9 MB/s |
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modulation => 3, # QAM_64 |
| 170 |
} |
| 171 |
|
| 172 |
=cut |
| 173 |
|
| 174 |
sub parameters { _get ($_[0]{fd}, $_[0]{type}) } |
| 175 |
sub get { _get ($_[0]{fd}, $_[0]{type}) } # unannounced alias |
| 176 |
sub event { _event ($_[0]{fd}, $_[0]{type}) } |
| 177 |
|
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package Linux::DVB::Demux; |
| 179 |
|
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@ISA = qw(Linux::DVB); |
| 181 |
|
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=back |
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|
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=head1 Linux::DVB::Demux CLASS |
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|
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=head2 SYNOPSIS |
| 187 |
|
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my $dmx = new Linux::DVB::Demux |
| 189 |
"/dev/dvb/adapter0/demux0"; |
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|
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$fe->fh; # filehandle |
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$fe->fd; # fileno |
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$fe->blocking (1); # non-blocking is default |
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|
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$dmx->buffer (16384); |
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$dmx->sct_filter ($pid, "filter", "mask", $timeout=0, $flags=DMX_CHECK_CRC); |
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$dmx->pes_filter ($pid, $input, $output, $type, $flags=0); |
| 198 |
$dmx->start; |
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$dmx->stop; |
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|
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=over 4 |
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|
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=cut |
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|
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sub new { |
| 206 |
my ($class, $path) = @_; |
| 207 |
my $self = $class->SUPER::new ($path, &Fcntl::O_RDWR); |
| 208 |
|
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$self; |
| 210 |
} |
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|
| 212 |
sub start { _start ($_[0]{fd}) } |
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sub stop { _stop ($_[0]{fd}) } |
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|
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sub sct_filter { _filter ($_[0]{fd}, @_[1, 2, 3, 4, 5]) } |
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sub pes_filter { _pes_filter ($_[0]{fd}, @_[1, 2, 3, 4, 5]) } |
| 217 |
sub buffer { _buffer ($_[0]{fd}, $_[1]) } |
| 218 |
|
| 219 |
package Linux::DVB::Decode; |
| 220 |
|
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=back |
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|
| 223 |
=head1 Linux::DVB::Decode CLASS |
| 224 |
|
| 225 |
=head2 SYNOPSIS |
| 226 |
|
| 227 |
$si_decoded_hashref = Linux::DVB::Decode::si $section_data; |
| 228 |
|
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=over 4 |
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|
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=cut |
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|
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=item $hashref = Linux::DVB::Decode::si $section_data |
| 234 |
|
| 235 |
Tries to parse the string inside C<$section_data> as an SI table and |
| 236 |
return it as a hash reference. Only the first SI table will be returned |
| 237 |
as hash reference, and the C<$section_data> will be modified in-place by |
| 238 |
removing the table data. |
| 239 |
|
| 240 |
The way to use this function is to append new data to your |
| 241 |
C<$section_data> and then call C<Linux::DVB::Decode::si> in a loop until |
| 242 |
it returns C<undef>. Please ntoe, however, that the Linux DVB API will |
| 243 |
return only one table at a time from sysread, so you can safely assume |
| 244 |
that every sysread will return exactly one (or zero in case of errors) SI |
| 245 |
table. |
| 246 |
|
| 247 |
Here is an example of what to expect: |
| 248 |
|
| 249 |
{ |
| 250 |
'segment_last_section_number' => 112, |
| 251 |
'table_id' => 81, |
| 252 |
'service_id' => 28129, |
| 253 |
'original_network_id' => 1, |
| 254 |
'section_syntax_indicator' => 1, |
| 255 |
'current_next_indicator' => 1, |
| 256 |
'events' => [ |
| 257 |
{ |
| 258 |
'running_status' => 0, |
| 259 |
'start_time_hms' => 2097152, |
| 260 |
'event_id' => 39505, |
| 261 |
'free_CA_mode' => 0, |
| 262 |
'start_time_mjd' => 53470, |
| 263 |
'descriptors' => [ |
| 264 |
{ |
| 265 |
'event_name' => 'Nachrichten', |
| 266 |
'text' => '', |
| 267 |
'ISO_639_language_code' => 'deu', |
| 268 |
'type' => 77 |
| 269 |
}, |
| 270 |
{ |
| 271 |
'programme_identification_label' => 337280, |
| 272 |
'type' => 105 |
| 273 |
}, |
| 274 |
{ |
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'raw_data' => '22:0010.04#00', |
| 276 |
'type' => 130 |
| 277 |
} |
| 278 |
], |
| 279 |
'duration' => 1280 |
| 280 |
}, |
| 281 |
{ |
| 282 |
'running_status' => 0, |
| 283 |
'start_time_hms' => 2098432, |
| 284 |
'event_id' => 39506, |
| 285 |
'free_CA_mode' => 0, |
| 286 |
'start_time_mjd' => 53470, |
| 287 |
'descriptors' => [ |
| 288 |
{ |
| 289 |
'event_name' => 'SR 1 - Nachtwerk', |
| 290 |
'text' => '', |
| 291 |
'ISO_639_language_code' => 'deu', |
| 292 |
'type' => 77 |
| 293 |
}, |
| 294 |
{ |
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'programme_identification_label' => 337285, |
| 296 |
'type' => 105 |
| 297 |
}, |
| 298 |
{ |
| 299 |
'raw_data' => '22:0510.04#00', |
| 300 |
'type' => 130 |
| 301 |
} |
| 302 |
], |
| 303 |
'duration' => 87296 |
| 304 |
} |
| 305 |
], |
| 306 |
'last_table_id' => 81, |
| 307 |
'section_number' => 112, |
| 308 |
'last_section_number' => 176, |
| 309 |
'version_number' => 31, |
| 310 |
'transport_stream_id' => 1101 |
| 311 |
} |
| 312 |
|
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|
| 314 |
=item $text = Linux::DVB::Decode::text $data |
| 315 |
|
| 316 |
Converts text found in DVB si tables into perl text. Only iso-8859-1..-11 |
| 317 |
and UTF-16 is supported, other encodings (big5 etc. is not. Bug me if you |
| 318 |
need this). |
| 319 |
|
| 320 |
=cut |
| 321 |
|
| 322 |
sub text($) { |
| 323 |
use Encode; |
| 324 |
|
| 325 |
for ($_[0]) { |
| 326 |
s/^([\x01-\x0b])// and $_ = decode sprintf ("iso-8859-%d", 4 + ord $1), $_; |
| 327 |
# 10 - pardon you??? |
| 328 |
s/^\x11// and $_ = decode "utf16-be", $_; |
| 329 |
# 12 ksc5601, DB |
| 330 |
# 13 db2312, DB |
| 331 |
# 14 big5(?), DB |
| 332 |
s/\x8a/\n/g; |
| 333 |
#s/([\x00-\x09\x0b-\x1f\x80-\x9f])/sprintf "{%02x}", ord $1/ge; |
| 334 |
s/([\x00-\x09\x0b-\x1f\x80-\x9f])//ge; |
| 335 |
} |
| 336 |
} |
| 337 |
|
| 338 |
=item %Linux::DVB::Decode::nibble_to_genre |
| 339 |
|
| 340 |
A two-level hash mapping genre nibbles to genres, e.g. |
| 341 |
|
| 342 |
$Linux::DVB::Decode::nibble_to_genre{7}{6} |
| 343 |
=> 'film/cinema' |
| 344 |
|
| 345 |
=cut |
| 346 |
|
| 347 |
our %nibble_to_genre = ( |
| 348 |
0x1 => { |
| 349 |
0x0 => 'Movie/Drama (general)', |
| 350 |
0x1 => 'Movie - detective/thriller', |
| 351 |
0x2 => 'Movie - adventure/western/war', |
| 352 |
0x3 => 'Movie - science fiction/fantasy/horror', |
| 353 |
0x4 => 'Movie - comedy', |
| 354 |
0x5 => 'Movie - soap/melodrama/folkloric', |
| 355 |
0x6 => 'Movie - romance', |
| 356 |
0x7 => 'Movie - serious/classical/religious/historical movie/drama', |
| 357 |
0x8 => 'Movie - adult movie/drama', |
| 358 |
}, |
| 359 |
0x2 => { |
| 360 |
0x0 => 'News/Current Affairs (general)', |
| 361 |
0x1 => 'news/weather report', |
| 362 |
0x2 => 'news magazine', |
| 363 |
0x3 => 'documentary', |
| 364 |
0x4 => 'discussion/interview/debate', |
| 365 |
}, |
| 366 |
0x3 => { |
| 367 |
0x0 => 'Show/Game Show (general)', |
| 368 |
0x1 => 'game show/quiz/contest', |
| 369 |
0x2 => 'variety show', |
| 370 |
0x3 => 'talk show', |
| 371 |
}, |
| 372 |
0x4 => { |
| 373 |
0x0 => 'Sports (general)', |
| 374 |
0x1 => 'special events (Olympic Games, World Cup etc.)', |
| 375 |
0x2 => 'sports magazines', |
| 376 |
0x3 => 'football/soccer', |
| 377 |
0x4 => 'tennis/squash', |
| 378 |
0x5 => 'team sports (excluding football)', |
| 379 |
0x6 => 'athletics', |
| 380 |
0x7 => 'motor sport', |
| 381 |
0x8 => 'water sport', |
| 382 |
0x9 => 'winter sports', |
| 383 |
0xA => 'equestrian', |
| 384 |
0xB => 'martial sports', |
| 385 |
}, |
| 386 |
0x5 => { |
| 387 |
0x0 => 'Childrens/Youth (general)', |
| 388 |
0x1 => "pre-school children's programmes", |
| 389 |
0x2 => 'entertainment programmes for 6 to 14', |
| 390 |
0x3 => 'entertainment programmes for 10 to 16', |
| 391 |
0x4 => 'informational/educational/school programmes', |
| 392 |
0x5 => 'cartoons/puppets', |
| 393 |
}, |
| 394 |
0x6 => { |
| 395 |
0x0 => 'Music/Ballet/Dance (general)', |
| 396 |
0x1 => 'rock/pop', |
| 397 |
0x2 => 'serious music or classical music', |
| 398 |
0x3 => 'folk/traditional music', |
| 399 |
0x4 => 'jazz', |
| 400 |
0x5 => 'musical/opera', |
| 401 |
0x6 => 'ballet', |
| 402 |
}, |
| 403 |
0x7 => { |
| 404 |
0x0 => 'Arts/Culture (without music, general)', |
| 405 |
0x1 => 'performing arts', |
| 406 |
0x2 => 'fine arts', |
| 407 |
0x3 => 'religion', |
| 408 |
0x4 => 'popular culture/traditional arts', |
| 409 |
0x5 => 'literature', |
| 410 |
0x6 => 'film/cinema', |
| 411 |
0x7 => 'experimental film/video', |
| 412 |
0x8 => 'broadcasting/press', |
| 413 |
0x9 => 'new media', |
| 414 |
0xA => 'arts/culture magazines', |
| 415 |
0xB => 'fashion', |
| 416 |
}, |
| 417 |
0x8 => { |
| 418 |
0x0 => 'Social/Policical/Economics (general)', |
| 419 |
0x1 => 'magazines/reports/documentary', |
| 420 |
0x2 => 'economics/social advisory', |
| 421 |
0x3 => 'remarkable people', |
| 422 |
}, |
| 423 |
0x9 => { |
| 424 |
0x0 => 'Education/Science/Factual (general)', |
| 425 |
0x1 => 'nature/animals/environment', |
| 426 |
0x2 => 'technology/natural sciences', |
| 427 |
0x3 => 'medicine/physiology/psychology', |
| 428 |
0x4 => 'foreign countries/expeditions', |
| 429 |
0x5 => 'social/spiritual sciences', |
| 430 |
0x6 => 'further education', |
| 431 |
0x7 => 'languages', |
| 432 |
}, |
| 433 |
0xA => { |
| 434 |
0x0 => 'Leisure/Hobbies (general)', |
| 435 |
0x1 => 'tourism/travel', |
| 436 |
0x2 => 'handicraft', |
| 437 |
0x3 => 'motoring', |
| 438 |
0x4 => 'fitness & health', |
| 439 |
0x5 => 'cooking', |
| 440 |
0x6 => 'advertizement/shopping', |
| 441 |
0x7 => 'gardening', |
| 442 |
}, |
| 443 |
0xB => { |
| 444 |
0x0 => '(original language)', |
| 445 |
0x1 => '(black & white)', |
| 446 |
0x2 => '(unpublished)', |
| 447 |
0x3 => '(live broadcast)', |
| 448 |
}, |
| 449 |
); |
| 450 |
|
| 451 |
=item ($sec,$min,$hour) = Linux::DVB::Decode::time $hms |
| 452 |
|
| 453 |
=item ($mday,$mon,$year) = Linux::DVB::Decode::date $mjd |
| 454 |
|
| 455 |
=item ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::datetime $mjd, $hms |
| 456 |
|
| 457 |
=item $sec = Linux::DVB::Decode::time_linear $hms |
| 458 |
|
| 459 |
=item $sec = Linux::DVB::Decode::datetime_linear $mjd, $hms |
| 460 |
|
| 461 |
Break down a "DVB time" (modified julian date + bcd encoded seconds) into |
| 462 |
it's components (non-C<_linear>) or into a seconds count (C<_linear> |
| 463 |
variants) since the epoch (C<datetime_linear>) or the start of the day |
| 464 |
(C<time_linear>). |
| 465 |
|
| 466 |
The format of the returns value of the date and datetime functions is |
| 467 |
I<not> compatible with C<Time::Local>. Use the C<_linear> functions |
| 468 |
instead. |
| 469 |
|
| 470 |
Example: |
| 471 |
|
| 472 |
my $time = Linux::DVB::Decode::datetime_linear $mjd, $hms |
| 473 |
printf "Starts at %s\n", |
| 474 |
POSIX::strftime "%Y-%m-%d %H:%M:%S", |
| 475 |
localtime $time; |
| 476 |
|
| 477 |
=cut |
| 478 |
|
| 479 |
sub time($) { |
| 480 |
my ($time) = @_; |
| 481 |
|
| 482 |
# Time is in UTC, 24 bit, every nibble one digit in BCD from right to left |
| 483 |
my $hour = sprintf "%02x", ($time >> 16) & 0xFF; |
| 484 |
my $minute = sprintf "%02x", ($time >> 8) & 0xFF; |
| 485 |
my $second = sprintf "%02x", ($time ) & 0xFF; |
| 486 |
|
| 487 |
($second, $minute, $hour) |
| 488 |
} |
| 489 |
|
| 490 |
sub date($) { |
| 491 |
my ($mjd) = @_; |
| 492 |
|
| 493 |
# Date is given in Modified Julian Date |
| 494 |
# Decoding routines taken from ANNEX C, ETSI EN 300 468 (DVB SI) |
| 495 |
my $y_ = int (($mjd - 15078.2) / 365.25); |
| 496 |
my $m_ = int (($mjd - 14956.1 - int ($y_ * 365.25)) / 30.6001); |
| 497 |
my $day = $mjd - 14956 - int ($y_ * 365.25) - int ($m_ * 30.6001); |
| 498 |
my $k = $m_ == 14 or $m_ == 15 ? 1 : 0; |
| 499 |
my $year = $y_ + $k + 1900; |
| 500 |
my $month = $m_ - 1 - $k * 12; |
| 501 |
|
| 502 |
($day, $month, $year) |
| 503 |
} |
| 504 |
|
| 505 |
sub datetime($$) { |
| 506 |
(Linux::DVB::Decode::time $_[1], date $_[0]) |
| 507 |
} |
| 508 |
|
| 509 |
sub time_linear($) { |
| 510 |
my ($s, $m, $h) = Linux::DVB::Decode::time $_[0]; |
| 511 |
|
| 512 |
(($h * 60) + $m * 60) + $s |
| 513 |
} |
| 514 |
|
| 515 |
sub datetime_linear($$) { |
| 516 |
my ($sec, $min, $hour, $mday, $mon, $year) = |
| 517 |
Linux::DVB::Decode::datetime $_[0], $_[1]; |
| 518 |
|
| 519 |
require Time::Local; |
| 520 |
Time::Local::timegm ($sec, $min, $hour, $mday, $mon - 1, $year) |
| 521 |
} |
| 522 |
|
| 523 |
=back |
| 524 |
|
| 525 |
=head1 AUTHORS |
| 526 |
|
| 527 |
Marc Lehmann <schmorp@schmorp.de>, http://home.schmorp.de/ |
| 528 |
Magnus Schmidt, eMail at http://www.27b-6.de/email.php |
| 529 |
|
| 530 |
=cut |
| 531 |
|
| 532 |
1 |
