1 | #------------------------------------------------------------------------------
|
---|
2 | # File: AIFF.pm
|
---|
3 | #
|
---|
4 | # Description: Read AIFF meta information
|
---|
5 | #
|
---|
6 | # Revisions: 01/06/2006 - P. Harvey Created
|
---|
7 | # 09/22/2008 - PH Added DjVu support
|
---|
8 | #
|
---|
9 | # References: 1) http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190
|
---|
10 | # 2) http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/
|
---|
11 | # 3) http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
|
---|
12 | #------------------------------------------------------------------------------
|
---|
13 |
|
---|
14 | package Image::ExifTool::AIFF;
|
---|
15 |
|
---|
16 | use strict;
|
---|
17 | use vars qw($VERSION);
|
---|
18 | use Image::ExifTool qw(:DataAccess :Utils);
|
---|
19 | use Image::ExifTool::ID3;
|
---|
20 |
|
---|
21 | $VERSION = '1.03';
|
---|
22 |
|
---|
23 | # information for time/date-based tags (time zero is Jan 1, 1904)
|
---|
24 | my %timeInfo = (
|
---|
25 | Groups => { 2 => 'Time' },
|
---|
26 | ValueConv => 'ConvertUnixTime($val - ((66 * 365 + 17) * 24 * 3600))',
|
---|
27 | PrintConv => '$self->ConvertDateTime($val)',
|
---|
28 | );
|
---|
29 |
|
---|
30 | # AIFF info
|
---|
31 | %Image::ExifTool::AIFF::Main = (
|
---|
32 | GROUPS => { 2 => 'Audio' },
|
---|
33 | NOTES => 'Only the tags decoded by ExifTool are listed in this table.',
|
---|
34 | # FORM => 'Format',
|
---|
35 | FVER => {
|
---|
36 | Name => 'FormatVersion',
|
---|
37 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::FormatVers' },
|
---|
38 | },
|
---|
39 | COMM => {
|
---|
40 | Name => 'Common',
|
---|
41 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Common' },
|
---|
42 | },
|
---|
43 | COMT => {
|
---|
44 | Name => 'Comment',
|
---|
45 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Comment' },
|
---|
46 | },
|
---|
47 | NAME => 'Name',
|
---|
48 | AUTH => { Name => 'Author', Groups => { 2 => 'Author' } },
|
---|
49 | '(c) ' => { Name => 'Copyright', Groups => { 2 => 'Author' } },
|
---|
50 | ANNO => 'Annotation',
|
---|
51 | 'ID3 ' => {
|
---|
52 | Name => 'ID3',
|
---|
53 | SubDirectory => {
|
---|
54 | TagTable => 'Image::ExifTool::ID3::Main',
|
---|
55 | ProcessProc => \&Image::ExifTool::ID3::ProcessID3,
|
---|
56 | },
|
---|
57 | },
|
---|
58 | # SSND => 'SoundData',
|
---|
59 | # MARK => 'Marker',
|
---|
60 | # INST => 'Instrument',
|
---|
61 | # MIDI => 'MidiData',
|
---|
62 | # AESD => 'AudioRecording',
|
---|
63 | # APPL => 'ApplicationSpecific',
|
---|
64 | );
|
---|
65 |
|
---|
66 | %Image::ExifTool::AIFF::Common = (
|
---|
67 | PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
---|
68 | GROUPS => { 2 => 'Audio' },
|
---|
69 | FORMAT => 'int16u',
|
---|
70 | 0 => 'NumChannels',
|
---|
71 | 1 => { Name => 'NumSampleFrames', Format => 'int32u' },
|
---|
72 | 3 => 'SampleSize',
|
---|
73 | 4 => { Name => 'SampleRate', Format => 'extended' }, #3
|
---|
74 | 9 => {
|
---|
75 | Name => 'CompressionType',
|
---|
76 | Format => 'string[4]',
|
---|
77 | PrintConv => {
|
---|
78 | NONE => 'None',
|
---|
79 | ACE2 => 'ACE 2-to-1',
|
---|
80 | ACE8 => 'ACE 8-to-3',
|
---|
81 | MAC3 => 'MAC 3-to-1',
|
---|
82 | MAC6 => 'MAC 6-to-1',
|
---|
83 | sowt => 'Little-endian, no compression',
|
---|
84 | },
|
---|
85 | },
|
---|
86 | );
|
---|
87 |
|
---|
88 | %Image::ExifTool::AIFF::FormatVers = (
|
---|
89 | PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
---|
90 | FORMAT => 'int32u',
|
---|
91 | 0 => { Name => 'FormatVersionTime', %timeInfo },
|
---|
92 | );
|
---|
93 |
|
---|
94 | %Image::ExifTool::AIFF::Comment = (
|
---|
95 | PROCESS_PROC => \&Image::ExifTool::AIFF::ProcessComment,
|
---|
96 | GROUPS => { 2 => 'Audio' },
|
---|
97 | 0 => { Name => 'CommentTime', %timeInfo },
|
---|
98 | 1 => 'MarkerID',
|
---|
99 | 2 => 'Comment',
|
---|
100 | );
|
---|
101 |
|
---|
102 | #------------------------------------------------------------------------------
|
---|
103 | # Process AIFF Comment chunk
|
---|
104 | # Inputs: 0) ExifTool object reference, 1) DirInfo reference, 2) tag table ref
|
---|
105 | # Returns: 1 on success
|
---|
106 | sub ProcessComment($$$)
|
---|
107 | {
|
---|
108 | my ($exifTool, $dirInfo, $tagTablePtr) = @_;
|
---|
109 | my $dataPt = $$dirInfo{DataPt};
|
---|
110 | my $dirLen = $$dirInfo{DirLen};
|
---|
111 | my $verbose = $exifTool->Options('Verbose');
|
---|
112 | return 0 unless $dirLen > 2;
|
---|
113 | my $numComments = unpack('n',$$dataPt);
|
---|
114 | my $pos = 2;
|
---|
115 | my $i;
|
---|
116 | $verbose and $exifTool->VerboseDir('Comment', $numComments);
|
---|
117 | for ($i=0; $i<$numComments; ++$i) {
|
---|
118 | last if $pos + 8 > $dirLen;
|
---|
119 | my ($time, $markerID, $size) = unpack("x${pos}Nnn", $$dataPt);
|
---|
120 | $exifTool->HandleTag($tagTablePtr, 0, $time);
|
---|
121 | $exifTool->HandleTag($tagTablePtr, 1, $markerID) if $markerID;
|
---|
122 | $pos += 8;
|
---|
123 | last if $pos + $size > $dirLen;
|
---|
124 | my $val = substr($$dataPt, $pos, $size);
|
---|
125 | $exifTool->HandleTag($tagTablePtr, 2, $val);
|
---|
126 | ++$size if $size & 0x01; # account for padding byte if necessary
|
---|
127 | $pos += $size;
|
---|
128 | }
|
---|
129 | }
|
---|
130 |
|
---|
131 | #------------------------------------------------------------------------------
|
---|
132 | # Extract information from a AIFF file
|
---|
133 | # Inputs: 0) ExifTool object reference, 1) DirInfo reference
|
---|
134 | # Returns: 1 on success, 0 if this wasn't a valid AIFF file
|
---|
135 | sub ProcessAIFF($$)
|
---|
136 | {
|
---|
137 | my ($exifTool, $dirInfo) = @_;
|
---|
138 | my $raf = $$dirInfo{RAF};
|
---|
139 | my ($buff, $err, $tagTablePtr, $page, $type);
|
---|
140 |
|
---|
141 | # verify this is a valid AIFF file
|
---|
142 | return 0 unless $raf->Read($buff, 12) == 12;
|
---|
143 | my $pos = 12;
|
---|
144 | # check for DjVu image
|
---|
145 | if ($buff =~ /^AT&TFORM/) {
|
---|
146 | # http://www.djvu.org/
|
---|
147 | # http://djvu.sourceforge.net/specs/djvu3changes.txt
|
---|
148 | my $buf2;
|
---|
149 | return 0 unless $raf->Read($buf2, 4) == 4 and $buf2 =~ /^(DJVU|DJVM)/;
|
---|
150 | $pos += 4;
|
---|
151 | $buff = substr($buff, 4) . $buf2;
|
---|
152 | $tagTablePtr = GetTagTable('Image::ExifTool::DjVu::Main');
|
---|
153 | $exifTool->SetFileType('DJVU');
|
---|
154 | # modifiy FileType to indicate a multi-page document
|
---|
155 | $exifTool->{VALUE}->{FileType} .= " (multi-page)" if $buf2 eq 'DJVM';
|
---|
156 | $type = 'DjVu';
|
---|
157 | } else {
|
---|
158 | return 0 unless $buff =~ /^FORM....(AIF(F|C))/s;
|
---|
159 | $exifTool->SetFileType($1);
|
---|
160 | $tagTablePtr = GetTagTable('Image::ExifTool::AIFF::Main');
|
---|
161 | $type = 'AIFF';
|
---|
162 | }
|
---|
163 | SetByteOrder('MM');
|
---|
164 | #
|
---|
165 | # Read through the IFF chunks
|
---|
166 | #
|
---|
167 | for (;;) {
|
---|
168 | $raf->Read($buff, 8) == 8 or last;
|
---|
169 | $pos += 8;
|
---|
170 | my ($tag, $len) = unpack('a4N', $buff);
|
---|
171 | my $tagInfo = $exifTool->GetTagInfo($tagTablePtr, $tag);
|
---|
172 | $exifTool->VPrint(0, "AIFF '$tag' chunk ($len bytes of data):\n");
|
---|
173 | # AIFF chunks are padded to an even number of bytes
|
---|
174 | my $len2 = $len + ($len & 0x01);
|
---|
175 | if ($tagInfo) {
|
---|
176 | if ($$tagInfo{TypeOnly}) {
|
---|
177 | $len = $len2 = 4;
|
---|
178 | $page = ($page || 0) + 1;
|
---|
179 | $exifTool->VPrint(0, $exifTool->{INDENT} . "Page $page:\n");
|
---|
180 | }
|
---|
181 | $raf->Read($buff, $len2) >= $len or $err=1, last;
|
---|
182 | unless ($$tagInfo{SubDirectory} or $$tagInfo{Binary}) {
|
---|
183 | $buff =~ s/\0+$//; # remove trailing nulls
|
---|
184 | }
|
---|
185 | $exifTool->HandleTag($tagTablePtr, $tag, $buff,
|
---|
186 | DataPt => \$buff,
|
---|
187 | DataPos => $pos,
|
---|
188 | Start => 0,
|
---|
189 | Size => $len,
|
---|
190 | );
|
---|
191 | } else {
|
---|
192 | $raf->Seek($len2, 1) or $err=1, last;
|
---|
193 | }
|
---|
194 | $pos += $len2;
|
---|
195 | }
|
---|
196 | $err and $exifTool->Warn("Error reading $type file (corrupted?)");
|
---|
197 | return 1;
|
---|
198 | }
|
---|
199 |
|
---|
200 | 1; # end
|
---|
201 |
|
---|
202 | __END__
|
---|
203 |
|
---|
204 | =head1 NAME
|
---|
205 |
|
---|
206 | Image::ExifTool::AIFF - Read AIFF meta information
|
---|
207 |
|
---|
208 | =head1 SYNOPSIS
|
---|
209 |
|
---|
210 | This module is used by Image::ExifTool
|
---|
211 |
|
---|
212 | =head1 DESCRIPTION
|
---|
213 |
|
---|
214 | This module contains routines required by Image::ExifTool to extract
|
---|
215 | information from AIFF (Audio Interchange File Format) audio files.
|
---|
216 |
|
---|
217 | =head1 AUTHOR
|
---|
218 |
|
---|
219 | Copyright 2003-2011, Phil Harvey (phil at owl.phy.queensu.ca)
|
---|
220 |
|
---|
221 | This library is free software; you can redistribute it and/or modify it
|
---|
222 | under the same terms as Perl itself.
|
---|
223 |
|
---|
224 | =head1 REFERENCES
|
---|
225 |
|
---|
226 | =over 4
|
---|
227 |
|
---|
228 | =item L<http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190>
|
---|
229 |
|
---|
230 | =item L<http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/>
|
---|
231 |
|
---|
232 | =item L<http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/>
|
---|
233 |
|
---|
234 | =back
|
---|
235 |
|
---|
236 | =head1 SEE ALSO
|
---|
237 |
|
---|
238 | L<Image::ExifTool::TagNames/AIFF Tags>,
|
---|
239 | L<Image::ExifTool(3pm)|Image::ExifTool>
|
---|
240 |
|
---|
241 | =cut
|
---|