1 | ###########################################################################
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2 | #
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3 | # AudioDBPlugin.pm -- for extracting Chroma and Power Log features to work
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4 | # with Queen Marys audioDB
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5 | #
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6 | # A component of the Greenstone digital library software
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7 | # from the New Zealand Digital Library Project at the
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8 | # University of Waikato, New Zealand.
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9 | #
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10 | # Copyright (C) 2011 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful,
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18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | # GNU General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | package AudioDBPlugin;
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29 |
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30 | use BasePlugin;
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31 | use FFTExtractor;
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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 | use gsprintf 'gsprintf';
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38 |
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39 | sub BEGIN {
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40 | @AudioDBPlugin::ISA = ('BasePlugin', 'FFTExtractor');
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41 | }
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42 |
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43 | my $enable_streaming_list =
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44 | [{'name' => "disabled", 'desc' => "Do not create any video file optimised for streaming over the Internet."},
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45 | {'name' => "flv", 'desc' => "Uses the FLV format for streaming media. Better to target old computers."},
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46 | {'name' => "mp4", 'desc' => "Uses the MP4 container with H264 and AAC codecs. Better quality at very low bitrates but more ressources intensive."},
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47 | {'name' => "mp3", 'desc' => "(audio only) Uses MP3 for psuedo streaming."}
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48 | ];
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49 |
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50 | my $streaming_mime_types = { "flv" => "video/flv",
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51 | "mp4" => "video/mp4",
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52 | "mp3" => "audio/mpeg" };
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53 |
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54 | my $arguments =
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55 | [
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56 | { 'name' => "compute_fft_features",
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57 | 'desc' => "{FFTExtractor.compute_fft_features}",
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58 | 'type' => "enum",
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59 | 'list' => [{'name' => "true", 'desc' => "{common.true}"},
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60 | {'name' => "false", 'desc' => "{common.false}"}],
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61 | 'deft' => "false",
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62 | 'reqd' => "no" },
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63 | { 'name' => "process_exp",
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64 | 'desc' => "{BasePlugin.process_exp}",
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65 | 'type' => "regexp",
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66 | 'deft' => &get_default_process_exp(),
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67 | 'reqd' => "no" },
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68 |
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69 | { 'name' => "enable_streaming",
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70 | 'desc' => "{MultimediaPlug.enable_streaming}",
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71 | 'type' => "enum",
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72 | 'list' => $enable_streaming_list,
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73 | 'deft' => "disabled",
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74 | 'reqd' => "no" }
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75 | ];
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76 |
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77 | my $options = { 'name' => "AudioDBPlugin",
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78 | 'desc' => "{AudioDBPlugin.desc}",
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79 | 'abstract' => "no",
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80 | 'inherits' => "yes",
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81 | 'args' => $arguments };
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82 |
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83 |
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84 |
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85 | sub new {
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86 | my ($class) = shift (@_);
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87 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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88 | push(@$pluginlist, $class);
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89 |
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90 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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91 | push(@{$hashArgOptLists->{"OptList"}},$options);
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92 |
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93 |
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94 | my $ffte_self = new FFTExtractor($pluginlist, $inputargs, $hashArgOptLists,1);
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95 | my $base_self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
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96 |
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97 | my $self = BasePlugin::merge_inheritance($ffte_self,$base_self);
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98 |
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99 | return bless $self, $class;
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100 | }
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101 |
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102 | sub get_default_process_exp {
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103 | my $self = shift (@_);
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104 |
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105 | return q^(?i)(\.mp3|\.wave?|\.aif[fc]?|\.au|\.snd|\.og[ga])$^;
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106 | }
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107 |
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108 | sub begin {
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109 | my $self = shift (@_);
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110 | my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;
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111 |
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112 | $self->SUPER::begin(@_);
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113 | $self->FFTExtractor::begin(@_);
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114 | }
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115 |
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116 |
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117 |
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118 | # do plugin specific processing of doc_obj
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119 | sub process {
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120 | my $self = shift (@_);
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121 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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122 |
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123 | my $outhandle = $self->{'outhandle'};
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124 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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125 |
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126 | my $top_section = $doc_obj->get_top_section();
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127 |
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128 | # associate original file
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129 | # if filename ext not .wav convert (optionally cached) to wav
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130 |
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131 | my $wav_filename;
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132 |
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133 | my ($input_ext) = ($filename_full_path =~ m/\.(.*?)$/);
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134 | $input_ext = lc($input_ext);
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135 |
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136 |
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137 | if ($input_ext ne "wav") {
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138 | $wav_filename = $self->convert_audio_format($filename_full_path,"wav");
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139 | }
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140 | else {
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141 | $wav_filename = $filename_full_path;
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142 | }
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143 | $doc_obj->associate_file($wav_filename, "doc.wav", "audio/wav", $top_section);
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144 |
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145 | if ($self->{'enable_streaming'} ne "disabled") {
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146 |
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147 | my $streamable_ext = lc($self->{'enable_streaming'});
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148 | my $streamable_filename;
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149 |
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150 | if ($input_ext ne $streamable_ext) {
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151 | # make streamable version
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152 | $streamable_filename
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153 | = $self->convert_audio_format($filename_full_path,$streamable_ext);
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154 | }
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155 | else {
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156 | $streamable_filename = $filename_full_path;
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157 | }
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158 |
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159 | $doc_obj->associate_file($streamable_filename,
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160 | "doc.$streamable_ext",
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161 | $streaming_mime_types->{$streamable_ext},
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162 | $top_section);
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163 |
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164 | }
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165 |
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166 | #
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167 | # Opportunity here to segment, use beat-tracking ...
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168 | #
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169 |
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170 | if ($self->{'compute_fft_features'} eq "true")
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171 | {
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172 | # compute chroma 12 and associate file
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173 | my $chr12_filename = $self->compute_fft_features($wav_filename,"chroma");
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174 | $doc_obj->associate_file($chr12_filename, "doc.chr12",
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175 | "text/plain", $top_section);
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176 |
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177 | # compute power log and associate file
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178 | my $powerlog_filename = $self->compute_fft_features($wav_filename,"power-log");
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179 | $doc_obj->associate_file($powerlog_filename, "doc.power",
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180 | "text/plain", $top_section);
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181 | }
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182 |
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183 | #we have no text - adds dummy text and NoText metadata
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184 | $self->add_dummy_text($doc_obj, $doc_obj->get_top_section());
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185 |
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186 | return 1;
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187 | }
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188 |
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189 |
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190 |
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191 | 1;
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192 |
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193 |
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194 |
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