source: gs2-extensions/music-ir/trunk/perllib/plugins/MusicIRPlugin.pm@ 22430

###########################################################################
#
# MusicIRPlugin.pm -- for augmenting audio/midi files with Music IR 
#                     features and tags
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# 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 version 2 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################

package MusicIRPlugin;

use BasePlugin;
use jAudioExtractor;

use strict;
no strict 'refs'; # allow filehandles to be variables and viceversa
no strict 'subs';

use gsprintf 'gsprintf';

sub BEGIN {
    @MusicIRPlugin::ISA = ('BasePlugin', 'jAudioExtractor');
}

my $arguments =
    [ 
      { 'name' => "compute_mir_features",
    'desc' => "{BasePlugin.compute_mir_features}",
    'type' => "enum",
    'list' => [{'name' => "true",  'desc' => "{common.true}"},
           {'name' => "false", 'desc' => "{common.false}"}],
    'deft' => "false",
    'reqd' => "no" },
      { 'name' => "process_exp",
    'desc' => "{BasePlugin.process_exp}",
    'type' => "regexp",
    'deft' => &get_default_process_exp(),
    'reqd' => "no" }
      ];

my $options = { 'name'     => "MusicIRPlugin",
        'desc'     => "{MusicIRPlugin.desc}",
        'abstract' => "no",
        'inherits' => "yes",
        'args'     => $arguments };



sub new {
    my ($class) = shift (@_);
    my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
    push(@$pluginlist, $class);

    push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
    push(@{$hashArgOptLists->{"OptList"}},$options);

    
    my $jac_self = new jAudioExtractor($pluginlist, $inputargs, $hashArgOptLists);
    my $base_self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);

    my $self = BasePlugin::merge_inheritance($jac_self,$base_self);

    return bless $self, $class;
}

sub get_default_process_exp {
    my $self = shift (@_);
    
    return q^(?i)(\.mp3|\.wave?|\.aif[fc]?|\.au|\.snd|\.og[ga])$^; 
}

sub begin {
    my $self = shift (@_);
    my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;

    $self->SUPER::begin(@_);
    $self->jAudioExtractor::begin(@_);
}



# do plugin specific processing of doc_obj
sub process {
    my $self = shift (@_);
    my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;


    my $outhandle = $self->{'outhandle'};
    my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);

    if ($self->{'compute_mir_features'} eq "true")
    {
    my $utf8_filename_no_path = $self->filepath_to_utf8($filename_no_path);
    my $url_encoded_filename = &util::rename_file($utf8_filename_no_path, $self->{'file_rename_method'});
    
    my $features_filename = $self->compute_features($filename_full_path);
    my ($features_ext) = ($features_filename =~ m/\.([^.]+)$/);

    my $top_section = $doc_obj->get_top_section();
    
    my $mime_type = ($features_ext eq "arff") ? "text/plain" : "text/xml";
    $doc_obj->associate_file($features_filename, "jaudio.$features_ext", 
                 $mime_type, $top_section);

    }

    #we have no text - adds dummy text and NoText metadata
    $self->add_dummy_text($doc_obj, $doc_obj->get_top_section());

    return 1;

}


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