#!/usr/bin/perl
use strict ;
use File::Basename ;
use Pod::Usage ;
use Getopt::Long qw/:config no_ignore_case/ ;

++$! ;

# Script illustrating the use of the Linux::DVB::DVBT package for recording channels

use Linux::DVB::DVBT ;

our $VERSION = "1.000" ;

	my ($help, $man, $DEBUG, $VERBOSE, $config, $adap) ;
	GetOptions('v|verbose=s' => \$VERBOSE,
			   'debug=s' => \$DEBUG,
			   'h|help' => \$help,
			   'man' => \$man,
			   'cfg=s' => \$config,
			   'a|adap|dvb=i' => \$adap,
			   ) or pod2usage(2) ;


    pod2usage(1) if $help;
    pod2usage(-verbose => 2) if $man;
    pod2usage("$0: No arguments given.")  if (@ARGV == 0) ;
    pod2usage("$0: No filename given.")  if (@ARGV <= 1) ;
    pod2usage("$0: No duration given.")  if (@ARGV <= 2) ;

	Linux::DVB::DVBT->debug($DEBUG) ;
	Linux::DVB::DVBT->verbose($VERBOSE) ;

	## Create dvb. 
	## NOTE: With default object settings, the application will
	## die on *any* error, so there is no error checking in this script
	##
	my $dvb = Linux::DVB::DVBT->new(
		'adapter_num' 	=> $adap,
	) ;
	
	$dvb->config_path($config) if $config ;
	
	my ($channel, $file, $duration) = @ARGV ;

	## Convert duration to seconds
	my $seconds = Linux::DVB::DVBT::Utils::timesec2secs($duration) ;
	
	## Select the channel
	$dvb->select_channel($channel) ;
	
	## Add si tables
	add_si_tables($dvb, $channel, $seconds) ;
	
	## Record using ffmpeg
	my ($name, $dir) = (fileparse($file, '\..*'))[0,1] ;
	my $dev = $dvb->dvr_name ;
	system("ffmpeg -i $dev -vcodec copy -acodec copy -async 1 -t $duration -y '$dir/$name.mpeg'")==0 or die "Error: failed to record : $!" ;

	exit 0 ;

#--------------------------------------------------------------------------------------------------------------------
# ffmpeg now needs this extra SI table information. The follwoing code is pulled out from DVBT.pm....
#
sub add_si_tables
{
	my ($dvb, $file, $seconds) = @_ ;
	
	## Set up the multiplex info for this single file

	# get entry for this file (or create it)
	my $href = $dvb->_multiplex_file_href($file) ;
	
	# set time
	$href->{'duration'} = $seconds ;
	
	# set total length
	$dvb->{_multiplex_info}{'duration'} = $seconds ;
			
	# set demux filter info
	push @{$href->{'demux'}}, @{$dvb->{_demux_filters}};

	# get tsid
	my $frontend_href = $dvb->frontend_params() ;
	my $tsid = $frontend_href->{'tsid'} ;
	
	## Add in SI tables (if required) to the multiplex info
	my $error = $dvb->_add_required_si($tsid) ;
	
	## ensure pid lists match the demux list
	$dvb->_update_multiplex_info($tsid) ;

}

#=================================================================================
# END
#=================================================================================
__END__

=head1 OBSOLETE

This script just got a lot more complicated because ffmpeg now needs the SI tables to be
able to decode the transport stream correctly. I would B<STRONGLY> advise you use one of 
the other recording scripts. This script will no longer be supported.

=head1 NAME

dvbt-ffrec - Record a program to file

=head1 SYNOPSIS

dvbt-ffrec [options] channel filename duration

Options:

       -debug level         set debug level
       -verbose level       set verbosity level
       -help                brief help message
       -man                 full documentation
       -a <num>             Use adapter <num>
       
=head1 OPTIONS

=over 8

=item B<-help>

Print a brief help message and exits.

=item B<-man>

Prints the manual page and exits.

=item B<-verbose>

Set verbosity level. Higher values show more information.

=item B<-debug>

Set debug level. Higher levels show more debugging information (only really of any interest to developers!)

=item B<-a>

Specify which adapter number to use


=back

=head1 DESCRIPTION

Script that uses the perl Linux::DVB::DVBT package to provide DVB-T adapter functions.

This script differs from B<dvbt-record> in that it illustrates the use of the DVR device by using it as an input
to ffmpeg. Here, ffmpeg is used to take the raw transport stream data and encapsulate it into an mpeg file.

Obviously, ffmpeg needs to be installed on the system for this script to work!

Specify the channel name to record, the filename of the recorded file (which may include a directory path
and the directories will be created as needed), and the duration of the recording. Note that the filename will be converted
to end with .mpeg extension.

The duration may be specified either as an integer number of minutes, or in HH:MM format (for hours & minutes), or in
HH:MM:SS format (for hours, minutes, seconds).

The program uses a "fuzzy" search to match the specified channel name with the name broadcast by the network.
The case of the name is not important, and neither is whitespace. The search also checks for both numeric and
name instances of a number (e.g. "1" and "one").

For example, the following are all equivalent and match with the broadcast channel name "BBC ONE":

    bbc1
    BbC One
    b b c    1  


For full details of the DVBT functions, please see:

   perldoc Linux::DVB::DVBT
 
=cut