1 | #------------------------------------------------------------------------------
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2 | # File: AIFF.pm
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3 | #
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4 | # Description: Read AIFF meta information
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5 | #
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6 | # Revisions: 01/06/2006 - P. Harvey Created
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7 | # 09/22/2008 - PH Added DjVu support
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8 | #
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9 | # References: 1) http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190
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10 | # 2) http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/
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11 | # 3) http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
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12 | #------------------------------------------------------------------------------
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13 |
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14 | package Image::ExifTool::AIFF;
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15 |
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16 | use strict;
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17 | use vars qw($VERSION);
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18 | use Image::ExifTool qw(:DataAccess :Utils);
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19 | use Image::ExifTool::ID3;
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20 |
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21 | $VERSION = '1.11';
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22 |
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23 | # information for time/date-based tags (time zero is Jan 1, 1904)
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24 | my %timeInfo = (
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25 | Groups => { 2 => 'Time' },
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26 | ValueConv => 'ConvertUnixTime($val - ((66 * 365 + 17) * 24 * 3600))',
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27 | PrintConv => '$self->ConvertDateTime($val)',
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28 | );
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29 |
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30 | # AIFF info
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31 | %Image::ExifTool::AIFF::Main = (
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32 | GROUPS => { 2 => 'Audio' },
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33 | NOTES => q{
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34 | Tags extracted from Audio Interchange File Format (AIFF) files. See
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35 | L<http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/AIFF.html> for
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36 | the AIFF specification.
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37 | },
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38 | # FORM => 'Format',
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39 | FVER => {
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40 | Name => 'FormatVersion',
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41 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::FormatVers' },
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42 | },
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43 | COMM => {
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44 | Name => 'Common',
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45 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Common' },
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46 | },
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47 | COMT => {
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48 | Name => 'Comment',
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49 | SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Comment' },
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50 | },
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51 | NAME => {
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52 | Name => 'Name',
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53 | ValueConv => '$self->Decode($val, "MacRoman")',
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54 | },
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55 | AUTH => {
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56 | Name => 'Author',
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57 | Groups => { 2 => 'Author' },
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58 | ValueConv => '$self->Decode($val, "MacRoman")',
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59 | },
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60 | '(c) ' => {
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61 | Name => 'Copyright',
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62 | Groups => { 2 => 'Author' },
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63 | ValueConv => '$self->Decode($val, "MacRoman")',
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64 | },
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65 | ANNO => {
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66 | Name => 'Annotation',
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67 | ValueConv => '$self->Decode($val, "MacRoman")',
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68 | },
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69 | 'ID3 ' => {
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70 | Name => 'ID3',
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71 | SubDirectory => {
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72 | TagTable => 'Image::ExifTool::ID3::Main',
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73 | ProcessProc => \&Image::ExifTool::ID3::ProcessID3,
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74 | },
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75 | },
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76 | APPL => 'ApplicationData', # (first 4 bytes are the application signature)
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77 | # SSND => 'SoundData',
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78 | # MARK => 'Marker',
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79 | # INST => 'Instrument',
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80 | # MIDI => 'MidiData',
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81 | # AESD => 'AudioRecording',
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82 | );
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83 |
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84 | %Image::ExifTool::AIFF::Common = (
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85 | PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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86 | GROUPS => { 2 => 'Audio' },
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87 | FORMAT => 'int16u',
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88 | 0 => 'NumChannels',
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89 | 1 => { Name => 'NumSampleFrames', Format => 'int32u' },
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90 | 3 => 'SampleSize',
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91 | 4 => { Name => 'SampleRate', Format => 'extended' }, #3
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92 | 9 => {
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93 | Name => 'CompressionType',
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94 | Format => 'string[4]',
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95 | PrintConv => {
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96 | NONE => 'None',
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97 | ACE2 => 'ACE 2-to-1',
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98 | ACE8 => 'ACE 8-to-3',
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99 | MAC3 => 'MAC 3-to-1',
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100 | MAC6 => 'MAC 6-to-1',
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101 | sowt => 'Little-endian, no compression',
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102 | alaw => 'a-law',
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103 | ALAW => 'A-law',
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104 | ulaw => 'mu-law',
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105 | ULAW => 'Mu-law',
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106 | 'GSM '=> 'GSM',
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107 | G722 => 'G722',
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108 | G726 => 'G726',
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109 | G728 => 'G728',
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110 | },
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111 | },
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112 | 11 => { #PH
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113 | Name => 'CompressorName',
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114 | Format => 'pstring',
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115 | ValueConv => '$self->Decode($val, "MacRoman")',
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116 | },
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117 | );
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118 |
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119 | %Image::ExifTool::AIFF::FormatVers = (
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120 | PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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121 | FORMAT => 'int32u',
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122 | 0 => { Name => 'FormatVersionTime', %timeInfo },
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123 | );
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124 |
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125 | %Image::ExifTool::AIFF::Comment = (
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126 | PROCESS_PROC => \&Image::ExifTool::AIFF::ProcessComment,
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127 | GROUPS => { 2 => 'Audio' },
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128 | 0 => { Name => 'CommentTime', %timeInfo },
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129 | 1 => 'MarkerID',
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130 | 2 => {
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131 | Name => 'Comment',
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132 | ValueConv => '$self->Decode($val, "MacRoman")',
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133 | },
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134 | );
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135 |
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136 | %Image::ExifTool::AIFF::Composite = (
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137 | Duration => {
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138 | Require => {
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139 | 0 => 'AIFF:SampleRate',
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140 | 1 => 'AIFF:NumSampleFrames',
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141 | },
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142 | RawConv => '($val[0] and $val[1]) ? $val[1] / $val[0] : undef',
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143 | PrintConv => 'ConvertDuration($val)',
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144 | },
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145 | );
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146 |
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147 | # add our composite tags
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148 | Image::ExifTool::AddCompositeTags('Image::ExifTool::AIFF');
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149 |
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150 |
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151 | #------------------------------------------------------------------------------
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152 | # Process AIFF Comment chunk
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153 | # Inputs: 0) ExifTool object reference, 1) DirInfo reference, 2) tag table ref
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154 | # Returns: 1 on success
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155 | sub ProcessComment($$$)
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156 | {
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157 | my ($et, $dirInfo, $tagTablePtr) = @_;
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158 | my $dataPt = $$dirInfo{DataPt};
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159 | my $dirLen = $$dirInfo{DirLen};
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160 | my $verbose = $et->Options('Verbose');
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161 | return 0 unless $dirLen > 2;
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162 | my $numComments = unpack('n',$$dataPt);
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163 | my $pos = 2;
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164 | my $i;
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165 | $verbose and $et->VerboseDir('Comment', $numComments);
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166 | for ($i=0; $i<$numComments; ++$i) {
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167 | last if $pos + 8 > $dirLen;
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168 | my ($time, $markerID, $size) = unpack("x${pos}Nnn", $$dataPt);
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169 | $et->HandleTag($tagTablePtr, 0, $time);
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170 | $et->HandleTag($tagTablePtr, 1, $markerID) if $markerID;
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171 | $pos += 8;
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172 | last if $pos + $size > $dirLen;
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173 | my $val = substr($$dataPt, $pos, $size);
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174 | $et->HandleTag($tagTablePtr, 2, $val);
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175 | ++$size if $size & 0x01; # account for padding byte if necessary
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176 | $pos += $size;
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177 | }
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178 | }
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179 |
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180 | #------------------------------------------------------------------------------
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181 | # Extract information from a AIFF file
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182 | # Inputs: 0) ExifTool object reference, 1) DirInfo reference
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183 | # Returns: 1 on success, 0 if this wasn't a valid AIFF file
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184 | sub ProcessAIFF($$)
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185 | {
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186 | my ($et, $dirInfo) = @_;
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187 | my $raf = $$dirInfo{RAF};
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188 | my ($buff, $err, $tagTablePtr, $page, $type, $n);
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189 |
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190 | # verify this is a valid AIFF file
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191 | return 0 unless $raf->Read($buff, 12) == 12;
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192 | my $fast3 = $$et{OPTIONS}{FastScan} && $$et{OPTIONS}{FastScan} == 3;
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193 | my $pos = 12;
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194 | # check for DjVu image
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195 | if ($buff =~ /^AT&TFORM/) {
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196 | # http://www.djvu.org/
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197 | # http://djvu.sourceforge.net/specs/djvu3changes.txt
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198 | my $buf2;
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199 | return 0 unless $raf->Read($buf2, 4) == 4 and $buf2 =~ /^(DJVU|DJVM)/;
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200 | $pos += 4;
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201 | $buff = substr($buff, 4) . $buf2;
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202 | $et->SetFileType('DJVU');
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203 | return 1 if $fast3;
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204 | $tagTablePtr = GetTagTable('Image::ExifTool::DjVu::Main');
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205 | # modify FileType to indicate a multi-page document
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206 | $$et{VALUE}{FileType} .= " (multi-page)" if $buf2 eq 'DJVM';
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207 | $type = 'DjVu';
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208 | } else {
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209 | return 0 unless $buff =~ /^FORM....(AIF(F|C))/s;
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210 | $et->SetFileType($1);
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211 | return 1 if $fast3;
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212 | $tagTablePtr = GetTagTable('Image::ExifTool::AIFF::Main');
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213 | $type = 'AIFF';
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214 | }
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215 | SetByteOrder('MM');
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216 | my $verbose = $et->Options('Verbose');
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217 | #
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218 | # Read through the IFF chunks
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219 | #
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220 | for ($n=0;;++$n) {
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221 | $raf->Read($buff, 8) == 8 or last;
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222 | $pos += 8;
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223 | my ($tag, $len) = unpack('a4N', $buff);
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224 | my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
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225 | $et->VPrint(0, "AIFF '${tag}' chunk ($len bytes of data): ", $raf->Tell(),"\n");
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226 | # AIFF chunks are padded to an even number of bytes
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227 | my $len2 = $len + ($len & 0x01);
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228 | if ($len2 > 100000000) {
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229 | if ($len2 >= 0x80000000 and not $et->Options('LargeFileSupport')) {
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230 | $et->Warn('End of processing at large chunk (LargeFileSupport not enabled)');
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231 | last;
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232 | }
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233 | if ($tagInfo) {
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234 | $et->Warn("Skipping large $$tagInfo{Name} chunk (> 100 MB)");
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235 | undef $tagInfo;
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236 | }
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237 | }
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238 | if ($tagInfo) {
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239 | if ($$tagInfo{TypeOnly}) {
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240 | $len = $len2 = 4;
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241 | $page = ($page || 0) + 1;
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242 | $et->VPrint(0, $$et{INDENT} . "Page $page:\n");
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243 | }
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244 | $raf->Read($buff, $len2) >= $len or $err=1, last;
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245 | unless ($$tagInfo{SubDirectory} or $$tagInfo{Binary}) {
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246 | $buff =~ s/\0+$//; # remove trailing nulls
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247 | }
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248 | $et->HandleTag($tagTablePtr, $tag, $buff,
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249 | DataPt => \$buff,
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250 | DataPos => $pos,
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251 | Start => 0,
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252 | Size => $len,
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253 | );
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254 | } elsif (not $len) {
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255 | next if ++$n < 100;
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256 | $et->Warn('Aborting scan. Too many empty chunks');
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257 | last;
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258 | } elsif ($verbose > 2 and $len2 < 1024000) {
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259 | $raf->Read($buff, $len2) == $len2 or $err = 1, last;
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260 | $et->VerboseDump(\$buff);
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261 | } else {
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262 | $raf->Seek($len2, 1) or $err=1, last;
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263 | }
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264 | $pos += $len2;
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265 | $n = 0;
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266 | }
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267 | $err and $et->Warn("Error reading $type file (corrupted?)");
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268 | return 1;
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269 | }
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270 |
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271 | 1; # end
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272 |
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273 | __END__
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274 |
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275 | =head1 NAME
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276 |
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277 | Image::ExifTool::AIFF - Read AIFF meta information
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278 |
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279 | =head1 SYNOPSIS
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280 |
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281 | This module is used by Image::ExifTool
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282 |
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283 | =head1 DESCRIPTION
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284 |
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285 | This module contains routines required by Image::ExifTool to extract
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286 | information from AIFF (Audio Interchange File Format) audio files.
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287 |
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288 | =head1 AUTHOR
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289 |
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290 | Copyright 2003-2021, Phil Harvey (philharvey66 at gmail.com)
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291 |
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292 | This library is free software; you can redistribute it and/or modify it
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293 | under the same terms as Perl itself.
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294 |
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295 | =head1 REFERENCES
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296 |
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297 | =over 4
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298 |
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299 | =item L<http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190>
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300 |
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301 | =item L<http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/>
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302 |
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303 | =item L<http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/>
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304 |
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305 | =back
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306 |
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307 | =head1 SEE ALSO
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308 |
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309 | L<Image::ExifTool::TagNames/AIFF Tags>,
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310 | L<Image::ExifTool(3pm)|Image::ExifTool>
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311 |
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312 | =cut
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