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=head1 NAME |
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|
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Linux::DVB - interface to (some parts of) the Linux DVB API |
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|
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=head1 SYNOPSIS |
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|
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use Linux::DVB; |
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|
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=head1 DESCRIPTION |
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|
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This module provides an interface to the Linux DVB API. It is a straightforward |
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translation of the C API. You should read the Linux DVB API description to make |
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any sense of this module. It can be found here: |
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|
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http://www.linuxtv.org/docs/dvbapi/dvbapi.html |
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|
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All constants from F<frontend.h> and F<demux.h> are exported by their C |
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name and by default. |
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|
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Noteworthy differences to the C API: unions and sub-structs are usually |
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translated into flat perl hashes, i.e C<struct.u.qam.symbol_rate> |
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becomes C<< $struct->{symbol_rate} >>. |
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|
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Noteworthy limitations of this module include: no way to set the |
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frequency or diseqc. No interface to the video, audio and net devices. |
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If you need this functionality bug the author. |
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|
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=cut |
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|
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package Linux::DVB; |
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|
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use Fcntl (); |
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|
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BEGIN { |
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$VERSION = '0.3'; |
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@ISA = qw(Exporter); |
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|
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require XSLoader; |
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XSLoader::load __PACKAGE__, $VERSION; |
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|
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require Exporter; |
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|
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my %consts = &_consts; |
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my $consts; |
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while (my ($k, $v) = each %consts) { |
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push @EXPORT, $k; |
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$consts .= "sub $k(){$v}\n"; |
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} |
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eval $consts; |
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} |
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|
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sub new { |
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my ($class, $path, $mode) = @_; |
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|
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my $self = bless { path => $path, mode => $mode }, $class; |
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sysopen $self->{fh}, $path, $mode | &Fcntl::O_NONBLOCK |
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or die "$path: $!"; |
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$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} } |
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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; |
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} |
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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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$tune->{symbol_rate}; |
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|
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=over 4 |
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|
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=cut |
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|
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sub new { |
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my ($class, $path, $mode) = @_; |
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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 ($_[0]{fd}) } |
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sub status { _read_status ($_[0]{fd}) } |
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sub ber { _read_ber ($_[0]{fd}) } |
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sub snr { _snr ($_[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, ...) |
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|
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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 { |
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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 $dmx = new Linux::DVB::Demux |
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"/dev/dvb/adapter0/demux0"; |
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|
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$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); |
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|
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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}, $_[1]) } |
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|
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package Linux::DVB::Decode; |
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|
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=back |
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|
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=head1 Linux::DVB::Decode CLASS |
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|
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=head2 SYNOPSIS |
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|
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$si_decoded_hashref = Linux::DVB::Decode::si $section_data; |
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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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=item $hashref = Linux::DVB::Decode::si $section_data |
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|
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Tries to parse the string inside C<$section_data> as an SI table and |
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return it as a hash reference. Only the first SI table will be returned |
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as hash reference, and the C<$section_data> will be modified in-place by |
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removing the table data. |
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|
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The way to use this function is to append new data to your |
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C<$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 |
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return only one table at a time from sysread, so you can safely assume |
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that every sysread will return exactly one (or zero in case of errors) SI |
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table. |
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|
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Here is an example of what to expect: |
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|
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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, |
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'section_syntax_indicator' => 1, |
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'current_next_indicator' => 1, |
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'events' => [ |
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{ |
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'running_status' => 0, |
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'start_time_hms' => 2097152, |
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'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, |
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'type' => 105 |
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}, |
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{ |
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'raw_data' => '22:0510.04#00', |
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'type' => 130 |
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} |
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], |
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'duration' => 87296 |
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} |
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], |
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'last_table_id' => 81, |
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'section_number' => 112, |
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'last_section_number' => 176, |
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'version_number' => 31, |
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'transport_stream_id' => 1101 |
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} |
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|
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|
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=item $text = Linux::DVB::Decode::text $data |
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|
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Converts text found in DVB si tables into perl text. Only iso-8859-1..-11 |
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and UTF-16 is supported, other encodings (big5 etc. is not. Bug me if you |
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need this). |
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|
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=cut |
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|
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sub text($) { |
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use Encode; |
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|
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for ($_[0]) { |
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s/^([\x01-\x0b])// and $_ = decode sprintf ("iso-8859-%d", 4 + ord $1), $_; |
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# 10 - pardon you??? |
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s/^\x11// and $_ = decode "utf16-be", $_; |
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# 12 ksc5601, DB |
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# 13 db2312, DB |
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# 14 big5(?), DB |
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s/\x8a/\n/g; |
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#s/([\x00-\x09\x0b-\x1f\x80-\x9f])/sprintf "{%02x}", ord $1/ge; |
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s/([\x00-\x09\x0b-\x1f\x80-\x9f])//ge; |
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} |
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} |
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|
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=item %Linux::DVB::Decode::nibble_to_genre |
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|
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A two-level hash mapping genre nibbles to genres, e.g. |
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|
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$Linux::DVB::Decode::nibble_to_genre{7}{6} |
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=> 'film/cinema' |
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|
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=cut |
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|
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our %nibble_to_genre = ( |
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0x1 => { |
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0x0 => 'Movie / Drama', |
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0x1 => 'Movie - detective/thriller', |
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0x2 => 'Movie - adventure/western/war', |
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0x3 => 'Movie - science fiction/fantasy/horror', |
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0x4 => 'Movie - comedy', |
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0x5 => 'Movie - soap/melodrama/folkloric', |
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0x6 => 'Movie - romance', |
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0x7 => 'Movie - serious/classical/religious/historical movie/drama', |
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0x8 => 'Movie - adult movie/drama', |
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}, |
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0x2 => { |
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0x0 => 'News / Current Affairs', |
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0x1 => 'news/weather report', |
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0x2 => 'news magazine', |
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0x3 => 'documentary', |
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0x4 => 'discussion/interview/debate', |
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}, |
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0x3 => { |
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0x0 => 'Show / Game Show', |
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0x1 => 'game show/quiz/contest', |
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0x2 => 'variety show', |
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0x3 => 'talk show', |
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}, |
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0x4 => { |
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0x0 => 'Sports', |
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0x1 => 'special events (Olympic Games, World Cup etc.)', |
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0x2 => 'sports magazines', |
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0x3 => 'football/soccer', |
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0x4 => 'tennis/squash', |
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0x5 => 'team sports (excluding football)', |
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0x6 => 'athletics', |
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0x7 => 'motor sport', |
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0x8 => 'water sport', |
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0x9 => 'winter sports', |
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0xA => 'equestrian', |
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0xB => 'martial sports', |
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}, |
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0x5 => { |
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0x0 => 'Childrens / Youth', |
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0x1 => "pre-school children's programmes", |
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0x2 => 'entertainment programmes for 6 to 14', |
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0x3 => 'entertainment programmes for 10 to 16', |
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0x4 => 'informational/educational/school programmes', |
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0x5 => 'cartoons/puppets', |
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}, |
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0x6 => { |
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0x0 => 'Music / Ballet / Dance', |
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0x1 => 'rock/pop', |
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0x2 => 'serious music/classical music', |
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0x3 => 'folk/traditional music', |
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0x4 => 'jazz', |
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0x5 => 'musical/opera', |
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0x6 => 'ballet', |
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}, |
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0x7 => { |
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0x0 => 'Arts / Culture', |
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0x1 => 'performing arts', |
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0x2 => 'fine arts', |
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0x3 => 'religion', |
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0x4 => 'popular culture/traditional arts', |
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0x5 => 'literature', |
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0x6 => 'film/cinema', |
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0x7 => 'experimental film/video', |
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0x8 => 'broadcasting/press', |
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0x9 => 'new media', |
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0xA => 'arts/culture magazines', |
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0xB => 'fashion', |
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}, |
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0x8 => { |
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0x0 => 'Social / Policical / Economics', |
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0x1 => 'magazines/reports/documentary', |
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0x2 => 'economics/social advisory', |
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0x3 => 'remarkable people', |
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}, |
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0x9 => { |
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0x0 => 'Education / Science / Factual', |
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0x1 => 'nature/animals/environment', |
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0x2 => 'technology/natural sciences', |
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0x3 => 'medicine/physiology/psychology', |
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0x4 => 'foreign countries/expeditions', |
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0x5 => 'social/spiritual sciences', |
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0x6 => 'further education', |
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0x7 => 'languages', |
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}, |
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0xA => { |
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0x0 => 'Leisure / Hobbies', |
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0x1 => 'tourism/travel', |
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0x2 => 'handicraft', |
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0x3 => 'motoring', |
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0x4 => 'fitness & health', |
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0x5 => 'cooking', |
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0x6 => 'advertizement/shopping', |
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0x7 => 'gardening', |
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}, |
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0xB => { |
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0x0 => 'Original Language', |
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0x1 => 'black & white', |
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0x2 => 'unpublished', |
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0x3 => 'live broadcast', |
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}, |
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); |
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|
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=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 |