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README

NAME
    Linux::DVB - interface to (some parts of) the Linux DVB API

SYNOPSIS
     use Linux::DVB;

DESCRIPTION
    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}".

    Noteworthy limitations of this module include: No interface to the
    video, audio and net devices. If you need this functionality bug the
    author.

Linux::DVB::Frontend CLASS
  SYNOPSIS
     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};

    $fe->set (parameter => value, ...)
        Sets frontend parameters. All values are stuffed into the
        "dvb_frontend_parameters" structure without conversion and passed to
        FE_SET_FRONTEND.

        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 =>

    $fe->parameters
        Calls FE_GET_FRONTEND and returns a hash reference that contains the
        same keys as given to the "set" method.

        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
          }

    $ok = $fe->diseqc_reset_overload
        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.

    $ok = $fe->diseqc_voltage (13|18)
        Set the DiSEqC voltage to either 13 or 18 volts.

    $ok = $fe->diseqc_tone (1|0)
        Enables (1) or disables (0) the DiSEqC continuous 22khz tone
        generation.

    $ok = $fe->diseqc_send_burst (0|1)
        Sends a 22KHz tone burst of type SEC_MINI_A (0) or SEC_MINI_B (1).

    $ok = $fe->diseqc_cmd ($command)
        Sends a DiSEqC command ($command is 3 to 6 bytes of binary data).

    $reply = $fe->diseqc_reply ($timeout)
        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).

Linux::DVB::Demux CLASS
  SYNOPSIS
     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;

Linux::DVB::Decode CLASS
  SYNOPSIS
       $si_decoded_hashref = Linux::DVB::Decode::si $section_data;

    $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.

        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.

        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
          }

    $text = Linux::DVB::Decode::text $data
        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).

    %Linux::DVB::Decode::nibble_to_genre
        A two-level hash mapping genre nibbles to genres, e.g.

           $Linux::DVB::Decode::nibble_to_genre{7}{6}
           => 'film/cinema'

    ($sec,$min,$hour) = Linux::DVB::Decode::time $hms
    ($mday,$mon,$year) = Linux::DVB::Decode::date $mjd
    ($sec,$min,$hour,$mday,$mon,$year) = Linux::DVB::Decode::datetime $mjd,
    $hms
    $sec = Linux::DVB::Decode::time_linear $hms
    $sec = Linux::DVB::Decode::datetime_linear $mjd, $hms
        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").

        The format of the returns value of the date and datetime functions
        is *not* compatible with "Time::Local". Use the "_linear" functions
        instead.

        Example:

           my $time = Linux::DVB::Decode::datetime_linear $mjd, $hms
           printf "Starts at %s\n",
              POSIX::strftime "%Y-%m-%d %H:%M:%S",
                 localtime $time;

AUTHORS
     Marc Lehmann <schmorp@schmorp.de>, http://home.schmorp.de/
     Magnus Schmidt, eMail at http://www.27b-6.de/email.php

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