#
# -*- Perl -*-
# ogg.pl (C) 2006 alexander@oelzant.priv.at 
# using code from mp3.pl which is ...
# Copyright (C) 2002 Luc@2113.ch ,
#               2002 2113.ch ,  
#               2003-2004 Namazu Project All rights reserved ,
#     This is free software with ABSOLUTELY NO WARRANTY.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either versions 2, or (at your option)
#  any later version.
# 
#  This program is distributed in the hope that it will be useful
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#  02111-1307, USA
#
#  This file must be encoded in EUC-JP encoding
#

package ogg;
use strict;

require 'util.pl';
require 'gfilter.pl';

my $rpmpath = undef;

sub mediatype() {
    return ('application/ogg');
}

sub status() {
    return 'yes';
}

sub recursive() {
    return 0;
}

sub pre_codeconv() {
    return 0;
}

sub post_codeconv () {
    return 0;
}

sub add_magic ($) {
    my ($magic) = @_;
    $magic->addMagicEntry("0\tstring\tOggS\tapplication/ogg");
    return;
}

sub filter($$$$$) {
    my $data1 = "";
    my $data2 = "";
    my ($orig_cfile, $contref, $weighted_str, $headings, $fields)
      = @_;
    my $cfile = defined $orig_cfile ? $$orig_cfile : '';

    my $header = substr($$contref, 0, 4);
    if ($cfile =~ /(\d\d\d\d-\d\d-\d\d)_(\d\d)_(\d\d)_(.*).ogg/) {
	    my $title=$3;
	    $title =~ s/_/ /g;
	    $data1 .= "Date: $1\n";
	    $data1 .= "Time: $2:$3\n";
	    $data1 .= "Title: $4\n";
    } else {
	    $data1 .= "Title: $cfile\n";
    }
    unless ($header =~ /OggS/) {
	util::vprint("Couldn't find OggS tag\n");
	$$contref=$data1;
	return undef;
    }

    util::vprint("Processing ogg file ...\n");
    my ($i,$len,$tot,$lacing,$ilacing,$offset,$status);
    $tot=length($$contref);
    $i=0;
    # an ogg page has a 27 byte header 
    # (3rd byte of the 7th word is the number of packets)
    # and the text information is in the first vorbis stream packet
    # of the second page ...
    # so we have to skip one ogg page, ...
    # the \xXXvorbis packet we want has \xXX type 3 :)
    my $info=0; # marker for info pack
    OGGS: 
    while (($i+27 < $tot) && substr($$contref, $i, 4) =~ /OggS/ && (($lacing)=unpack("C",substr($$contref, $i+26,1)))) {
	$status="page with $lacing packets at $i: ";
	$ilacing=0;
	$i+=27;
	$offset=$i+$lacing;
	while (($offset < $tot) && $ilacing < $lacing) {
		$len=unpack("C",substr($$contref, $i+$ilacing,1));
		$ilacing++;
		my $packet=substr($$contref, $offset, $len);
		if ($packet =~ /^\x03vorbis/ || $info == 1) {
			$status .= "I$len";
			$info=1;
			$data2 .= $packet;
			if ($len < 255) {
				print "\n";
				last OGGS;
			}
		} else {
			$status .= "_$len";
		}
		#my $packet=substr($$contref, $offset, $len);
		$offset+=$len;
	}
	util::vprint("$status\n");
	$i=$offset;
    }
    util::vprint("$status\n");
 #   $len=unpack("I",substr($$contref, $i, 4)))) {
    # the data packet consists of 7 bytes header, 1 byte encoder info,
    # 4 bytes network order "number of items" and a list of 
    #   4 bytes network order length, data
    if ($data2) {
	    my $item;
	    my $title="";
	    $i=7;
	    $len=unpack("V",substr($data2, $i, 4));
	    $i+=4;
	    $data1 .= "Encoder: " . substr($data2, $i, $len) . "\n";
	    $i+=$len;
	    my $items=unpack("V",substr($data2, $i, 4));
	    print "header: $len, number of items: $items\n";
	    $i+=4;
	    while ($items-- && defined($len=unpack("V",substr($data2, $i, 4)))) {
	            $i+=4;
		    my $item=substr($data2, $i, $len);
		    $item =~ s/=/: /;
		    if ($item =~ /^next:/) {
		    	$title="$item\n";
			$title =~ s/^next/title/;
		    } elsif ($item =~ /^title:/) {
		    	$title="$item\n";
		    } elsif ($item =~ /^:/) {
		    	$title.="Comment$item\n";
		    } else {
			    $data1 .= "$item\n";
		    }
		    $i+=$len;
	    }
	    
	    $data1=$title.$data1;
	    print $data1;
    } else {
	    $data1 .= (substr($$contref,0,1000));
	    $data1 =~ s/[^[:print:]]/ /msg;
	    $data1 =~ s/  / /g;
    }
    
    codeconv::toeuc(\$data1);
    $$contref = $data1;
    return undef;
    # TODO: there should probably be some kind of weighting function
    # like the one in the mp3 filter

}

sub get_title($$$) {
    my ($content, $weighted_str, $fields) = @_;

    if ($content =~ /Songname: (.*)/) {
	my $tmp = $1;
	$fields->{'title'} = $tmp;
    }else {
        $content =~ /Filename: (.*)/;
	my $tmp = $1;
	$fields->{'title'} = $tmp;
    }
    my $weight = $conf::Weight{'html'}->{'title'};
    $$weighted_str .= "\x7f$weight\x7f$fields->{'title'}\x7f/$weight\x7f\n";

}

sub get_author($$) {
    my ($content, $fields) = @_;

    if ($content =~ /Artist: (.*)/) {
	my $tmp = $1;
	$fields->{'author'} = $tmp;
    }
}

sub get_album($$) {
    my ($content, $fields) = @_;

    if ($content =~ /Album: (.*)/) {
	my $tmp = $1;
	$fields->{'album'} = $tmp;
    }
}

sub get_summary($$) {
    my ($content, $fields) = @_;
    $fields->{'summary'} = $content;
}

1;