1 | ###########################################################################
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2 | #
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3 | # OggVorbisPlug.pm -- A plugin for Ogg Vorbis audio files
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4 | #
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5 | # Original code by Christy Kuo
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6 | #
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7 | # A component of the Greenstone digital library software
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8 | # from the New Zealand Digital Library Project at the
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9 | # University of Waikato, New Zealand.
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10 | #
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11 | # Copyright 1999-2004 New Zealand Digital Library Project
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12 | #
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13 | # This program is free software; you can redistribute it and/or modify
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14 | # it under the terms of the GNU General Public License as published by
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15 | # the Free Software Foundation; either version 2 of the License, or
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16 | # (at your option) any later version.
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17 | #
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18 | # This program is distributed in the hope that it will be useful,
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19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 | # GNU General Public License for more details.
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22 | #
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23 | # You should have received a copy of the GNU General Public License
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24 | # along with this program; if not, write to the Free Software
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25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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26 | #
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27 | ###########################################################################
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28 |
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29 | package OggVorbisPlug;
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30 |
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31 |
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32 | use UnknownPlug;
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33 | use Ogg::Vorbis::Header::PurePerl;
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34 |
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35 | use strict;
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36 | no strict 'refs'; # allow filehandles to be variables and viceversa
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37 |
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38 | sub BEGIN {
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39 | @OggVorbisPlug::ISA = ('UnknownPlug');
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40 | }
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41 |
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42 |
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43 | my $arguments =
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44 | [ { 'name' => "process_exp",
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45 | 'desc' => "{BasPlug.process_exp}",
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46 | 'type' => "string",
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47 | 'deft' => &get_default_process_exp(),
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48 | 'reqd' => "no" },
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49 | { 'name' => "add_technical_metadata",
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50 | 'desc' => "{OggVorbisPlug.add_technical_metadata}",
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51 | 'type' => "flag",
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52 | 'deft' => "" } ];
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53 |
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54 | my $options = { 'name' => "OggVorbisPlug",
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55 | 'desc' => "{OggVorbisPlug.desc}",
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56 | 'inherits' => "yes",
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57 | 'abstract' => "no",
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58 | 'args' => $arguments };
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59 |
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60 |
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61 | # This plugin processes exported Ogg Vorbis files with the suffix ".ogg"
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62 | sub get_default_process_exp
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63 | {
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64 | return q^(?i)(\.ogg)$^;
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65 | }
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66 |
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67 |
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68 | sub new
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69 | {
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70 | my ($class) = shift(@_);
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71 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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72 | push(@$pluginlist, $class);
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73 |
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74 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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75 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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76 |
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77 | my $self = new UnknownPlug($pluginlist, $inputargs, $hashArgOptLists);
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78 |
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79 | return bless $self, $class;
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80 | }
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81 |
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82 |
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83 | sub read
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84 | {
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85 | my $self = shift (@_);
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86 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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87 |
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88 | my $outhandle = $self->{'outhandle'};
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89 |
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90 | #check process and block exps, smart block, etc
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91 | my ($block_status,$filename) = $self->read_block(@_);
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92 | return $block_status if ((!defined $block_status) || ($block_status==0));
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93 |
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94 | # Report that we're processing the file
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95 | print STDERR "<Processing n='$file' p='OggVorbisPlug'>\n" if ($gli);
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96 | print $outhandle "OggVorbisPlug: processing $file\n"
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97 | if ($self->{'verbosity'}) > 1;
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98 |
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99 | # file is just the name of the file (need to get rid off any leading directory names)
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100 | $file =~ s/^.*[\/\\]//;
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101 |
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102 | # create a new index document
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103 | my $doc_obj = new doc ($filename, "indexed_doc");
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104 | if ($processor->{'OIDtype'} =~ /^(assigned|dirname)$/) {
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105 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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106 | }
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107 | else {
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108 | $doc_obj->set_OIDtype ("incremental"); # this is done to avoid hashing content of file
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109 | }
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110 | my $section = $doc_obj->get_top_section();
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111 |
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112 | # replace spaces in filename with %20 in url for metadata entry
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113 | my $url = $file;
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114 | $url =~ s/ /%20/g;
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115 | # Source (filename) to be consistent with other plugins
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116 | $doc_obj->add_metadata ($section, "Source", $url);
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117 |
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118 | # Extract metadata
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119 | my $ogg = Ogg::Vorbis::Header::PurePerl->new($filename);
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120 |
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121 | # Comments added to the file
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122 | foreach my $key ($ogg->comment_tags())
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123 | {
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124 | # Convert key to title case
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125 | my $keytc = uc(substr($key, 0, 1)) . substr($key, 1, length($key));
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126 | foreach my $value ($ogg->comment($key))
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127 | {
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128 | if (defined $value && $value ne "") {
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129 | $doc_obj->add_metadata($section, $keytc, $value);
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130 | }
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131 | }
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132 | }
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133 |
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134 | # Technical data (optional)
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135 | if ($self->{'add_technical_metadata'}) {
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136 | foreach my $key (keys %{$ogg->info})
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137 | {
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138 | # Convert key to title case
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139 | my $keytc = uc(substr($key, 0, 1)) . substr($key, 1, length($key));
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140 | my $value = $ogg->info->{$key};
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141 | if (defined $value && $value ne "") {
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142 | $doc_obj->add_metadata($section, $keytc, $value);
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143 | }
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144 | }
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145 | }
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146 |
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147 | # srclink
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148 | $doc_obj->add_metadata ($section, "FileFormat", "OggVorbis");
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149 | $doc_obj->add_metadata ($section, "srclink", "<a href=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[Source]\">");
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150 | $doc_obj->add_metadata ($section, "/srclink", "</a>");
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151 | # srcicon (need to include "iogg.gif" in the greenstone images directory
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152 | $doc_obj->add_metadata ($section, "srcicon", "<img src=\"_httpprefix_/images/iogg.gif\" title=\"Download\" border=0>");
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153 |
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154 | # Add the actual file as an associated file
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155 | $doc_obj->associate_file($filename, $file, "VORBIS", $section);
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156 |
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157 | # Create an empty text string so we don't break downstream plugins
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158 | my $text = &gsprintf::lookup_string("{BasPlug.dummy_text}");
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159 |
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160 | # include any metadata passed in from previous plugins
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161 | $self->extra_metadata ($doc_obj, $section, $metadata);
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162 |
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163 | # do plugin specific processing of doc_obj
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164 | return undef unless defined ($self->process (\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj));
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165 |
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166 | # do any automatic metadata extraction
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167 | $self->auto_extract_metadata($doc_obj);
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168 |
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169 | # add an OID
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170 | $doc_obj->set_OID();
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171 | $doc_obj->add_text($section, $text);
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172 |
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173 | # process the document
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174 | $processor->process($doc_obj);
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175 |
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176 | $self->{'num_processed'}++;
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177 | return 1;
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178 | }
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179 |
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180 |
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181 | 1;
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