[16659] | 1 | ###########################################################################
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| 2 | #
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| 3 | # AudioPlugin.pm -- Plugin for MP3 files (MPEG audio layer 3).
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| 4 | #
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| 5 | # A component of the Greenstone digital library software from the New
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| 6 | # Zealand Digital Library Project at the University of Waikato, New
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| 7 | # Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2001 New Zealand Digital Library Project
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| 10 | #
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| 11 | # This program is free software; you can redistribute it and/or modify
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| 12 | # it under the terms of the GNU General Public License as published by
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| 13 | # the Free Software Foundation; either version 2 of the License, or
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| 14 | # (at your option) any later version.
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| 15 | #
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| 16 | # This program is distributed in the hope that it will be useful, but
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| 17 | # WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | # General Public License for more details.
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| 20 | #
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| 21 | # You should have received a copy of the GNU General Public License
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| 22 | # along with this program; if not, write to the Free Software
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| 23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 24 | #
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| 25 | ###########################################################################
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| 26 |
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| 27 |
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| 28 | package AudioPlugin;
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| 29 |
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| 30 | use BasePlugin;
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| 31 | use AudioConverter;
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| 32 |
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| 33 | use strict;
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| 34 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 35 | ###no strict 'subs';
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| 36 |
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| 37 | sub BEGIN {
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| 38 | @AudioPlugin::ISA = ('BasePlugin', 'AudioConverter');
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| 39 | }
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| 40 |
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| 41 | my $arguments =
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| 42 | [ { 'name' => "process_exp",
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| 43 | 'desc' => "{BasePlugin.process_exp}",
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| 44 | 'type' => "regexp",
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| 45 | 'deft' => &get_default_process_exp(),
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| 46 | 'reqd' => "no" } ];
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| 47 |
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| 48 | my $options = { 'name' => "AudioPlugin",
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| 49 | 'desc' => "{AudioPlugin.desc}",
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| 50 | 'abstract' => "no",
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| 51 | 'inherits' => "yes",
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| 52 | 'args' => $arguments };
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| 53 |
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| 54 | sub new {
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| 55 | my ($class) = shift (@_);
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| 56 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 57 | push(@$pluginlist, $class);
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| 58 |
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| 59 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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| 60 | push(@{$hashArgOptLists->{"OptList"}},$options);
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| 61 |
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| 62 | new AudioConverter($pluginlist, $inputargs, $hashArgOptLists);
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| 63 | my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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| 64 |
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| 65 | return bless $self, $class;
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| 66 | }
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| 67 |
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| 68 | sub init {
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| 69 | my $self = shift (@_);
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| 70 | my ($verbosity, $outhandle, $failhandle) = @_;
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| 71 |
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| 72 | $self->SUPER::init(@_);
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| 73 | $self->AudioConverter::init();
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| 74 | }
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| 75 |
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| 76 | sub get_default_process_exp
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| 77 | {
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| 78 | my $self = shift (@_);
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| 79 | if (!defined $self->{'stored_process_re'}) {
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| 80 |
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| 81 | my $static_fallback_re = q^(?i)\.(aif?|au|mp3|ogg|snd|wav)$^;
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| 82 |
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| 83 | if ($self->{'audio_conversion_available'}) {
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| 84 | # Haven't run sox before to see what formats it supports
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| 85 | # => do so now
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| 86 |
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| 87 | my $sox_output = `sox -h`;
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| 88 | my ($output_list) = ($sox_output =~ m/SUPPORTED FILE FORMATS:\s*(.*)$/m);
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| 89 | if (defined $output_list && ($output_list ne "")) {
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| 90 | $output_list =~ s/\s+/,/g;
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| 91 |
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| 92 | $self->{'stored_process_re'} = $output_list;
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| 93 | }
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| 94 | else {
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| 95 | $self->{'stored_process_re'} = $static_fallback_re;
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| 96 | }
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| 97 | }
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| 98 | else {
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| 99 | # Audio format conversion isn't supported, but (as for images)
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| 100 | # source format might very well be OK for inclusion in web
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| 101 | # page produced for document
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| 102 |
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| 103 | $self->{'stored_process_re'} = $static_fallback_re;
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| 104 | }
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| 105 | }
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| 106 |
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| 107 | print STDERR "*** returning: $self->{'stored_process_re'}\n";
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| 108 |
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| 109 | return $self->{'stored_process_re'};
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| 110 |
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| 111 | }
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| 112 |
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| 113 |
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| 114 |
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| 115 | # do plugin specific processing of doc_obj
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| 116 | sub process {
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| 117 | my $self = shift (@_);
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| 118 | # options??
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| 119 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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| 120 |
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| 121 |
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| 122 | my $outhandle = $self->{'outhandle'};
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| 123 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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| 124 |
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| 125 | my $top_section = $doc_obj->get_top_section();
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| 126 |
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| 127 | if ($self->{'audio_conversion_available'} == 1) {
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| 128 | $self->generate_audio($filename_full_path, $filename_no_path, $doc_obj, $top_section); # should we check the return value?
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| 129 | } else {
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| 130 | # do some basic stuff
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| 131 | # associate the audio, fileformat, mimetype, srclink, srcicon
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| 132 | # do this if sox not installed. but also if generate hasn't worked??
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| 133 | }
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| 134 | #we have no text - adds dummy text and NoText metadata
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| 135 | $self->add_dummy_text($doc_obj, $top_section);
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| 136 |
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| 137 |
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| 138 | # *****
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| 139 | # Does the code currently associate the original file with document?
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| 140 | # How about it's MIME type. This might be a bit tricky to work out
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| 141 | # for a dynamically generated list
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| 142 |
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| 143 | return 1;
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| 144 |
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| 145 | }
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| 146 |
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| 147 |
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| 148 |
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| 149 |
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| 150 |
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| 151 | 1;
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| 152 |
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| 153 |
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| 154 |
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| 155 |
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