root/gs3-extensions/audioDB/trunk/src/perllib/plugins/AudioDBPlugin.pm @ 24399

Revision 24399, 5.6 KB (checked in by davidb, 8 years ago)

Latest round of changes to code, in preparing for demo to Goldsmiths

Line 
1###########################################################################
2#
3# AudioDBPlugin.pm -- for extracting Chroma and Power Log features to work
4#                     with Queen Marys audioDB
5#
6# A component of the Greenstone digital library software
7# from the New Zealand Digital Library Project at the
8# University of Waikato, New Zealand.
9#
10# Copyright (C) 2011 New Zealand Digital Library Project
11#
12# This program is free software; you can redistribute it and/or modify
13# it under the terms of the GNU General Public License as published by
14# the Free Software Foundation; either version 2 of the License, or
15# (at your option) any later version.
16#
17# This program is distributed in the hope that it will be useful,
18# but WITHOUT ANY WARRANTY; without even the implied warranty of
19# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20# GNU General Public License for more details.
21#
22# You should have received a copy of the GNU General Public License
23# along with this program; if not, write to the Free Software
24# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25#
26###########################################################################
27
28package AudioDBPlugin;
29
30use BasePlugin;
31use FFTExtractor;
32
33use strict;
34no strict 'refs'; # allow filehandles to be variables and viceversa
35no strict 'subs';
36
37use gsprintf 'gsprintf';
38
39sub BEGIN {
40    @AudioDBPlugin::ISA = ('BasePlugin', 'FFTExtractor');
41}
42
43my $enable_streaming_list =
44    [{'name' => "disabled", 'desc' => "Do not create any video file optimised for streaming over the Internet."},
45     {'name' => "flv", 'desc' => "Uses the FLV format for streaming media. Better to target old computers."},
46     {'name' => "mp4", 'desc' => "Uses the MP4 container with H264 and AAC codecs. Better quality at very low bitrates but more ressources intensive."},
47     {'name' => "mp3", 'desc' => "(audio only) Uses MP3 for psuedo streaming."}
48     ];
49
50my $streaming_mime_types = { "flv" => "video/flv",
51                 "mp4" => "video/mp4",
52                 "mp3" => "audio/mpeg" };
53
54my $arguments =
55    [
56      { 'name' => "compute_fft_features",
57    'desc' => "{FFTExtractor.compute_fft_features}",
58    'type' => "enum",
59    'list' => [{'name' => "true",  'desc' => "{common.true}"},
60           {'name' => "false", 'desc' => "{common.false}"}],
61    'deft' => "false",
62    'reqd' => "no" },
63      { 'name' => "process_exp",
64    'desc' => "{BasePlugin.process_exp}",
65    'type' => "regexp",
66    'deft' => &get_default_process_exp(),
67    'reqd' => "no" },
68
69      { 'name' => "enable_streaming",
70        'desc' => "{MultimediaPlug.enable_streaming}",
71        'type' => "enum",
72        'list' => $enable_streaming_list,
73    'deft' => "disabled",
74    'reqd' => "no" }
75      ];
76
77my $options = { 'name'     => "AudioDBPlugin",
78        'desc'     => "{AudioDBPlugin.desc}",
79        'abstract' => "no",
80        'inherits' => "yes",
81        'args'     => $arguments };
82
83
84
85sub new {
86    my ($class) = shift (@_);
87    my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
88    push(@$pluginlist, $class);
89
90    push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
91    push(@{$hashArgOptLists->{"OptList"}},$options);
92
93   
94    my $ffte_self = new FFTExtractor($pluginlist, $inputargs, $hashArgOptLists,1);
95    my $base_self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);
96
97    my $self = BasePlugin::merge_inheritance($ffte_self,$base_self);
98
99    return bless $self, $class;
100}
101
102sub get_default_process_exp {
103    my $self = shift (@_);
104   
105    return q^(?i)(\.mp3|\.wave?|\.aif[fc]?|\.au|\.snd|\.og[ga])$^;
106}
107
108sub begin {
109    my $self = shift (@_);
110    my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;
111
112    $self->SUPER::begin(@_);
113    $self->FFTExtractor::begin(@_);
114}
115
116
117
118# do plugin specific processing of doc_obj
119sub process {
120    my $self = shift (@_);
121    my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
122
123    my $outhandle = $self->{'outhandle'};
124    my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
125
126    my $top_section = $doc_obj->get_top_section();
127
128    # associate original file
129    # if filename ext not .wav convert (optionally cached) to wav
130
131    my $wav_filename;
132
133    my ($input_ext) = ($filename_full_path =~ m/\.(.*?)$/);
134    $input_ext = lc($input_ext);
135
136
137    if ($input_ext ne "wav") { 
138    $wav_filename = $self->convert_audio_format($filename_full_path,"wav");
139    }
140    else {
141    $wav_filename = $filename_full_path;
142    }
143    $doc_obj->associate_file($wav_filename, "doc.wav", "audio/wav", $top_section);
144
145    if ($self->{'enable_streaming'} ne "disabled") {
146   
147    my $streamable_ext = lc($self->{'enable_streaming'});
148    my $streamable_filename;
149
150    if ($input_ext ne $streamable_ext) {
151        # make streamable version
152        $streamable_filename
153        = $self->convert_audio_format($filename_full_path,$streamable_ext);
154    }
155    else {
156        $streamable_filename = $filename_full_path;
157    }
158
159    $doc_obj->associate_file($streamable_filename,
160                 "doc.$streamable_ext",
161                 $streaming_mime_types->{$streamable_ext},
162                 $top_section);
163
164    }
165
166    #
167    # Opportunity here to segment, use beat-tracking ...
168    #
169
170    if ($self->{'compute_fft_features'} eq "true")
171    {
172    # compute chroma 12 and associate file
173    my $chr12_filename = $self->compute_fft_features($wav_filename,"chroma");
174    $doc_obj->associate_file($chr12_filename, "doc.chr12",
175                 "text/plain", $top_section);
176
177    # compute power log and associate file
178    my $powerlog_filename = $self->compute_fft_features($wav_filename,"power-log");
179    $doc_obj->associate_file($powerlog_filename, "doc.power",
180                 "text/plain", $top_section);
181    }
182   
183    #we have no text - adds dummy text and NoText metadata
184    $self->add_dummy_text($doc_obj, $doc_obj->get_top_section());
185
186    return 1;
187}
188
189
190
1911;
192
193
194
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