Linux::DVB - interface to (some parts of) the Linux DVB API
use Linux::DVB;
This module provides an interface to the Linux DVB API. It is a straightforward translation of the C API. You should read the Linux DVB API description to make any sense of this module. It can be found here:
http://www.linuxtv.org/docs/dvbapi/dvbapi.html
All constants from frontend.h and demux.h are exported by their C name and by default.
Noteworthy differences to the C API: unions and sub-structs are usually translated into flat perl hashes, i.e struct.u.qam.symbol_rate becomes $struct->{symbol_rate}.
struct.u.qam.symbol_rate
$struct->{symbol_rate}
Noteworthy limitations of this module include: No interface to the video, audio and net devices. If you need this functionality bug the author.
my $fe = new Linux::DVB::Frontend $path, $writable; my $fe = new Linux::DVB::Frontend "/dev/dvb/adapter0/frontend0", 1; $fe->fh; # filehandle $fe->fd; # fileno $fe->blocking (0); # or 1 $fe->{name} $fe->{type} $fe->frontend_info->{name} $fe->status & FE_HAS_LOCK print $fe->ber, $fe->snr, $fe->signal_strength, $fe->uncorrected; my $tune = $fe->parameters; $tune->{frequency}; $tune->{symbol_rate};
Sets frontend parameters. All values are stuffed into the dvb_frontend_parameters structure without conversion and passed to FE_SET_FRONTEND.
dvb_frontend_parameters
Returns true on success.
All modes:
frequency => inversion =>
QPSK frontends:
symbol_rate => fec_inner =>
QAM frontends:
symbol_rate => modulation =>
QFDM frontends:
bandwidth => code_rate_HP => code_rate_LP => constellation => transmission_mode =>
Calls FE_GET_FRONTEND and returns a hash reference that contains the same keys as given to the set method.
set
Example:
Data::Dumper::Dumper $fe->get { frequency => 426000000, # 426 Mhz inversion => 0, # INVERSION_OFF symbol_rate => 6900000, # 6.9 MB/s modulation => 3, # QAM_64 }
If the bus has been automatically powered off due to power overload, this call restores the power to the bus. The call requires read/write access to the device. This call has no effect if the device is manually powered off. Not all DVB adapters support this call.
Set the DiSEqC voltage to either 13 or 18 volts.
Enables (1) or disables (0) the DiSEqC continuous 22khz tone generation.
Sends a 22KHz tone burst of type SEC_MINI_A (0) or SEC_MINI_B (1).
Sends a DiSEqC command ($command is 3 to 6 bytes of binary data).
Receives a reply to a DiSEqC 2.0 command and returns it as a binary octet string 0..4 bytes in length (or undef in the error case).
undef
my $dmx = new Linux::DVB::Demux "/dev/dvb/adapter0/demux0"; $fe->fh; # filehandle $fe->fd; # fileno $fe->blocking (1); # non-blocking is default $dmx->buffer (16384); $dmx->sct_filter ($pid, "filter", "mask", $timeout=0, $flags=DMX_CHECK_CRC); $dmx->pes_filter ($pid, $input, $output, $type, $flags=0); $dmx->start; $dmx->stop;
$si_decoded_hashref = Linux::DVB::Decode::si $section_data;
Tries to parse the string inside $section_data as an SI table and return it as a hash reference. Only the first SI table will be returned as hash reference, and the $section_data will be modified in-place by removing the table data.
$section_data
The way to use this function is to append new data to your $section_data and then call Linux::DVB::Decode::si in a loop until it returns undef. Please ntoe, however, that the Linux DVB API will return only one table at a time from sysread, so you can safely assume that every sysread will return exactly one (or zero in case of errors) SI table.
Linux::DVB::Decode::si
Here is an example of what to expect:
{ 'segment_last_section_number' => 112, 'table_id' => 81, 'service_id' => 28129, 'original_network_id' => 1, 'section_syntax_indicator' => 1, 'current_next_indicator' => 1, 'events' => [ { 'running_status' => 0, 'start_time_hms' => 2097152, 'event_id' => 39505, 'free_CA_mode' => 0, 'start_time_mjd' => 53470, 'descriptors' => [ { 'event_name' => 'Nachrichten', 'text' => '', 'ISO_639_language_code' => 'deu', 'type' => 77 }, { 'programme_identification_label' => 337280, 'type' => 105 }, { 'raw_data' => '22:0010.04#00', 'type' => 130 } ], 'duration' => 1280 }, { 'running_status' => 0, 'start_time_hms' => 2098432, 'event_id' => 39506, 'free_CA_mode' => 0, 'start_time_mjd' => 53470, 'descriptors' => [ { 'event_name' => 'SR 1 - Nachtwerk', 'text' => '', 'ISO_639_language_code' => 'deu', 'type' => 77 }, { 'programme_identification_label' => 337285, 'type' => 105 }, { 'raw_data' => '22:0510.04#00', 'type' => 130 } ], 'duration' => 87296 } ], 'last_table_id' => 81, 'section_number' => 112, 'last_section_number' => 176, 'version_number' => 31, 'transport_stream_id' => 1101 }
Converts text found in DVB si tables into perl text. Only iso-8859-1..-11 and UTF-16 is supported, other encodings (big5 etc. is not. Bug me if you need this).
A two-level hash mapping genre nibbles to genres, e.g.
$Linux::DVB::Decode::nibble_to_genre{7}{6} => 'film/cinema'
Break down a "DVB time" (modified julian date + bcd encoded seconds) into it's components (non-_linear) or into a seconds count (_linear variants) since the epoch (datetime_linear) or the start of the day (time_linear).
_linear
datetime_linear
time_linear
The format of the returns value of the date and datetime functions is not compatible with Time::Local. Use the _linear functions instead.
Time::Local
my $time = Linux::DVB::Decode::datetime_linear $mjd, $hms printf "Starts at %s\n", POSIX::strftime "%Y-%m-%d %H:%M:%S", localtime $time;
Marc Lehmann <schmorp@schmorp.de>, http://home.schmorp.de/ Magnus Schmidt, eMail at http://www.27b-6.de/email.php
To install Linux::DVB, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Linux::DVB
CPAN shell
perl -MCPAN -e shell install Linux::DVB
For more information on module installation, please visit the detailed CPAN module installation guide.