| 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 = '0.2'; |
| 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) = @_; |
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|
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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 $self->{fh}; |
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|
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$self; |
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} |
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|
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sub fh { $_[0]{fh} } |
| 64 |
sub fd { $_[0]{fd} } |
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|
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sub blocking { |
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fcntl $_[0]{fh}, &Fcntl::F_SETFL, $_[1] ? 0 : &Fcntl::O_NONBLOCK; |
| 68 |
} |
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|
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package Linux::DVB::Frontend; |
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|
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@ISA = qw(Linux::DVB); |
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|
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=head1 Linux::DVB::Frontend CLASS |
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|
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=head2 SYNOPSIS |
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|
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my $fe = new Linux::DVB::Frontend $path, $writable; |
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|
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my $fe = new Linux::DVB::Frontend |
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"/dev/dvb/adapter0/frontend0", 1; |
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|
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$fe->fh; # filehandle |
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$fe->fd; # fileno |
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$fe->blocking (0); # or 1 |
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|
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$fe->{name} |
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$fe->{type} |
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$fe->frontend_info->{name} |
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|
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$fe->status & FE_HAS_LOCK |
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print $fe->ber, $fe->snr, $fe->signal_strength, $fe->uncorrected; |
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|
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my $tune = $fe->parameters; |
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$tune->{frequency}; |
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$tune->{symbol_rate}; |
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|
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=over 4 |
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|
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=cut |
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|
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sub new { |
| 103 |
my ($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, %{ $self->frontend_info } ); |
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|
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$self; |
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} |
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|
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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}) } |
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sub signal_strength { _signal_strength ($_[0]{fd}) } |
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sub uncorrected { _uncorrected ($_[0]{fd}) } |
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|
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=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 |
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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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fec_inner => |
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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 { |
| 153 |
my ($self) = shift; |
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_set $self->{fd}, { @_ }, $self->{type} |
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} |
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|
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=item $fe->parameters |
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|
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Calls FE_GET_FRONTEND and returns a hash reference that contains the same keys |
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as given to the C<set> method. |
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|
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Example: |
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|
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Data::Dumper::Dumper $fe->get |
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|
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{ |
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frequency => 426000000, # 426 Mhz |
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inversion => 0, # INVERSION_OFF |
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symbol_rate => 6900000, # 6.9 MB/s |
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fec_inner => 0, # FEC_NONE |
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modulation => 3, # QAM_64 |
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} |
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|
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=cut |
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|
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sub parameters { _get ($_[0]{fd}, $_[0]{type}) } |
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sub get { _get ($_[0]{fd}, $_[0]{type}) } # unannounced alias |
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sub event { _event ($_[0]{fd}, $_[0]{type}) } |
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|
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package Linux::DVB::Demux; |
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|
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@ISA = qw(Linux::DVB); |
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|
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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 |
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|
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my $dmx = new Linux::DVB::Demux |
| 191 |
"/dev/dvb/adapter0/demux0"; |
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|
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$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, $flags=0); |
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$dmx->start; |
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$dmx->stop; |
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|
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=over 4 |
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|
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=cut |
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|
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sub new { |
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my ($class, $path) = @_; |
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my $self = $class->SUPER::new ($path, &Fcntl::O_RDWR); |
| 210 |
|
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$self; |
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} |
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|
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sub start { _start ($_[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 ($_[0]{fd}, @_[1, 2, 3, 4, 5]) } |
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sub buffer { _buffer ($_[0]{fd}, $_[1]) } |
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|
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package Linux::DVB::Decode; |
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|
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=back |
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|
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=head1 Linux::DVB::Decode CLASS |
| 226 |
|
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=head2 SYNOPSIS |
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|
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$si_decoded_hashref = Linux::DVB::Decode::si $section_data; |
| 230 |
|
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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 $section_data |
| 236 |
|
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Tries to parse the string inside C<$section_data> as an SI table and |
| 238 |
return it as a hash reference. Only the first SI table will be returned |
| 239 |
as hash reference, and the C<$section_data> will be modified in-place by |
| 240 |
removing the table data. |
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|
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The way to use this function is to append new data to your |
| 243 |
C<$section_data> and then call C<Linux::DVB::Decode::si> in a loop until |
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it returns C<undef>. Please ntoe, however, that the Linux DVB API will |
| 245 |
return only one table at a time from sysread, so you can safely assume |
| 246 |
that every sysread will return exactly one (or zero in case of errors) SI |
| 247 |
table. |
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|
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Here is an example of what to expect: |
| 250 |
|
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{ |
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'segment_last_section_number' => 112, |
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'table_id' => 81, |
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'service_id' => 28129, |
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'original_network_id' => 1, |
| 256 |
'section_syntax_indicator' => 1, |
| 257 |
'current_next_indicator' => 1, |
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'events' => [ |
| 259 |
{ |
| 260 |
'running_status' => 0, |
| 261 |
'start_time_hms' => 2097152, |
| 262 |
'event_id' => 39505, |
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'free_CA_mode' => 0, |
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'start_time_mjd' => 53470, |
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'descriptors' => [ |
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{ |
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'event_name' => 'Nachrichten', |
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'text' => '', |
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'ISO_639_language_code' => 'deu', |
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'type' => 77 |
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}, |
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{ |
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'programme_identification_label' => 337280, |
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'type' => 105 |
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}, |
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{ |
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'raw_data' => '22:0010.04#00', |
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'type' => 130 |
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} |
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], |
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'duration' => 1280 |
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}, |
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{ |
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'running_status' => 0, |
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'start_time_hms' => 2098432, |
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'event_id' => 39506, |
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'free_CA_mode' => 0, |
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'start_time_mjd' => 53470, |
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'descriptors' => [ |
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{ |
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'event_name' => 'SR 1 - Nachtwerk', |
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'text' => '', |
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'ISO_639_language_code' => 'deu', |
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'type' => 77 |
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}, |
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{ |
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'programme_identification_label' => 337285, |
| 298 |
'type' => 105 |
| 299 |
}, |
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{ |
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'raw_data' => '22:0510.04#00', |
| 302 |
'type' => 130 |
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} |
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], |
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'duration' => 87296 |
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} |
| 307 |
], |
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'last_table_id' => 81, |
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'section_number' => 112, |
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'last_section_number' => 176, |
| 311 |
'version_number' => 31, |
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'transport_stream_id' => 1101 |
| 313 |
} |
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|
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|
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=item $text = Linux::DVB::Decode::text $data |
| 317 |
|
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Converts text found in DVB si tables into perl text. Only iso-8859-1..-11 |
| 319 |
and UTF-16 is supported, other encodings (big5 etc. is not. Bug me if you |
| 320 |
need this). |
| 321 |
|
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=cut |
| 323 |
|
| 324 |
sub text($) { |
| 325 |
use Encode; |
| 326 |
|
| 327 |
for ($_[0]) { |
| 328 |
s/^([\x01-\x0b])// and $_ = decode sprintf ("iso-8859-%d", 4 + ord $1), $_; |
| 329 |
# 10 - pardon you??? |
| 330 |
s/^\x11// and $_ = decode "utf16-be", $_; |
| 331 |
# 12 ksc5601, DB |
| 332 |
# 13 db2312, DB |
| 333 |
# 14 big5(?), DB |
| 334 |
s/\x8a/\n/g; |
| 335 |
#s/([\x00-\x09\x0b-\x1f\x80-\x9f])/sprintf "{%02x}", ord $1/ge; |
| 336 |
s/([\x00-\x09\x0b-\x1f\x80-\x9f])//ge; |
| 337 |
} |
| 338 |
} |
| 339 |
|
| 340 |
=item %Linux::DVB::Decode::nibble_to_genre |
| 341 |
|
| 342 |
A two-level hash mapping genre nibbles to genres, e.g. |
| 343 |
|
| 344 |
$Linux::DVB::Decode::nibble_to_genre{7}{6} |
| 345 |
=> 'film/cinema' |
| 346 |
|
| 347 |
=cut |
| 348 |
|
| 349 |
our %nibble_to_genre = ( |
| 350 |
0x1 => { |
| 351 |
0x0 => 'Movie / Drama', |
| 352 |
0x1 => 'Movie - detective/thriller', |
| 353 |
0x2 => 'Movie - adventure/western/war', |
| 354 |
0x3 => 'Movie - science fiction/fantasy/horror', |
| 355 |
0x4 => 'Movie - comedy', |
| 356 |
0x5 => 'Movie - soap/melodrama/folkloric', |
| 357 |
0x6 => 'Movie - romance', |
| 358 |
0x7 => 'Movie - serious/classical/religious/historical movie/drama', |
| 359 |
0x8 => 'Movie - adult movie/drama', |
| 360 |
}, |
| 361 |
0x2 => { |
| 362 |
0x0 => 'News / Current Affairs', |
| 363 |
0x1 => 'news/weather report', |
| 364 |
0x2 => 'news magazine', |
| 365 |
0x3 => 'documentary', |
| 366 |
0x4 => 'discussion/interview/debate', |
| 367 |
}, |
| 368 |
0x3 => { |
| 369 |
0x0 => 'Show / Game Show', |
| 370 |
0x1 => 'game show/quiz/contest', |
| 371 |
0x2 => 'variety show', |
| 372 |
0x3 => 'talk show', |
| 373 |
}, |
| 374 |
0x4 => { |
| 375 |
0x0 => 'Sports', |
| 376 |
0x1 => 'special events (Olympic Games, World Cup etc.)', |
| 377 |
0x2 => 'sports magazines', |
| 378 |
0x3 => 'football/soccer', |
| 379 |
0x4 => 'tennis/squash', |
| 380 |
0x5 => 'team sports (excluding football)', |
| 381 |
0x6 => 'athletics', |
| 382 |
0x7 => 'motor sport', |
| 383 |
0x8 => 'water sport', |
| 384 |
0x9 => 'winter sports', |
| 385 |
0xA => 'equestrian', |
| 386 |
0xB => 'martial sports', |
| 387 |
}, |
| 388 |
0x5 => { |
| 389 |
0x0 => 'Childrens / Youth', |
| 390 |
0x1 => "pre-school children's programmes", |
| 391 |
0x2 => 'entertainment programmes for 6 to 14', |
| 392 |
0x3 => 'entertainment programmes for 10 to 16', |
| 393 |
0x4 => 'informational/educational/school programmes', |
| 394 |
0x5 => 'cartoons/puppets', |
| 395 |
}, |
| 396 |
0x6 => { |
| 397 |
0x0 => 'Music / Ballet / Dance', |
| 398 |
0x1 => 'rock/pop', |
| 399 |
0x2 => 'serious music/classical music', |
| 400 |
0x3 => 'folk/traditional music', |
| 401 |
0x4 => 'jazz', |
| 402 |
0x5 => 'musical/opera', |
| 403 |
0x6 => 'ballet', |
| 404 |
}, |
| 405 |
0x7 => { |
| 406 |
0x0 => 'Arts / Culture', |
| 407 |
0x1 => 'performing arts', |
| 408 |
0x2 => 'fine arts', |
| 409 |
0x3 => 'religion', |
| 410 |
0x4 => 'popular culture/traditional arts', |
| 411 |
0x5 => 'literature', |
| 412 |
0x6 => 'film/cinema', |
| 413 |
0x7 => 'experimental film/video', |
| 414 |
0x8 => 'broadcasting/press', |
| 415 |
0x9 => 'new media', |
| 416 |
0xA => 'arts/culture magazines', |
| 417 |
0xB => 'fashion', |
| 418 |
}, |
| 419 |
0x8 => { |
| 420 |
0x0 => 'Social / Policical / Economics', |
| 421 |
0x1 => 'magazines/reports/documentary', |
| 422 |
0x2 => 'economics/social advisory', |
| 423 |
0x3 => 'remarkable people', |
| 424 |
}, |
| 425 |
0x9 => { |
| 426 |
0x0 => 'Education / Science / Factual', |
| 427 |
0x1 => 'nature/animals/environment', |
| 428 |
0x2 => 'technology/natural sciences', |
| 429 |
0x3 => 'medicine/physiology/psychology', |
| 430 |
0x4 => 'foreign countries/expeditions', |
| 431 |
0x5 => 'social/spiritual sciences', |
| 432 |
0x6 => 'further education', |
| 433 |
0x7 => 'languages', |
| 434 |
}, |
| 435 |
0xA => { |
| 436 |
0x0 => 'Leisure / Hobbies', |
| 437 |
0x1 => 'tourism/travel', |
| 438 |
0x2 => 'handicraft', |
| 439 |
0x3 => 'motoring', |
| 440 |
0x4 => 'fitness & health', |
| 441 |
0x5 => 'cooking', |
| 442 |
0x6 => 'advertizement/shopping', |
| 443 |
0x7 => 'gardening', |
| 444 |
}, |
| 445 |
0xB => { |
| 446 |
0x0 => 'Original Language', |
| 447 |
0x1 => 'black & white', |
| 448 |
0x2 => 'unpublished', |
| 449 |
0x3 => 'live broadcast', |
| 450 |
}, |
| 451 |
); |
| 452 |
|
| 453 |
=item ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::time $mjd, $time |
| 454 |
|
| 455 |
Break down a "DVB time" (modified julian date + bcd encoded seconds) into |
| 456 |
it's components in UTC (i.e. use Time::Local::timegm to convert to UNIX |
| 457 |
time). |
| 458 |
|
| 459 |
=cut |
| 460 |
|
| 461 |
sub time($$) { |
| 462 |
my ($mjd, $time) = @_; |
| 463 |
|
| 464 |
# Date is given in Modified Julian Date |
| 465 |
# Decoding routines taken from ANNEX C, ETSI EN 300 468 (DVB SI) |
| 466 |
my $y_ = int ($mjd - 15078.2) / 365.25; |
| 467 |
my $m_ = int (($mjd - 14956.1 - int ($y_ * 365.25)) / 30.6001); |
| 468 |
my $day = $mjd - 14956 - int ($y_ * 365.25) - int ($m_ * 30.6001); |
| 469 |
my $k = $m_ == 14 or $m_ == 15 ? 1 : 0; |
| 470 |
my $year = $y_ + $k + 1900; |
| 471 |
my $month = $m_ - 1 - $k * 12; |
| 472 |
|
| 473 |
# Time is in UTC, 24 bit, every nibble one digit in BCD from right to left |
| 474 |
my $hour = sprintf "%02x", ($time >> 16) & 0xFF; |
| 475 |
my $minute = sprintf "%02x", ($time >> 8) & 0xFF; |
| 476 |
my $second = sprintf "%02x", ($time ) & 0xFF; |
| 477 |
|
| 478 |
return ($second, $minute, $hour, $day, $month, $year); |
| 479 |
} |
| 480 |
|
| 481 |
=back |
| 482 |
|
| 483 |
=head1 AUTHORS |
| 484 |
|
| 485 |
Marc Lehmann <schmorp@schmorp.de>, http://home.schmorp.de/ |
| 486 |
Magnus Schmidt, eMail at http://www.27b-6.de/email.php |
| 487 |
|
| 488 |
=cut |
| 489 |
|
| 490 |
1 |
