157 lines
4.1 KiB
Perl
157 lines
4.1 KiB
Perl
#------------------------------------------------------------------------------
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# File: MPC.pm
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#
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# Description: Read Musepack audio meta information
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#
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# Revisions: 11/14/2006 - P. Harvey Created
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#
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# References: 1) http://www.musepack.net/
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#------------------------------------------------------------------------------
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package Image::ExifTool::MPC;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::FLAC;
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$VERSION = '1.01';
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# MPC metadata blocks
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%Image::ExifTool::MPC::Main = (
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PROCESS_PROC => \&Image::ExifTool::FLAC::ProcessBitStream,
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GROUPS => { 2 => 'Audio' },
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NOTES => q{
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Tags used in Musepack (MPC) audio files. ExifTool also extracts ID3 and APE
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information from these files.
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},
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'Bit032-063' => 'TotalFrames',
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'Bit080-081' => {
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Name => 'SampleRate',
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PrintConv => {
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0 => 44100,
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1 => 48000,
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2 => 37800,
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3 => 32000,
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},
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},
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'Bit084-087' => {
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Name => 'Quality',
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PrintConv => {
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1 => 'Unstable/Experimental',
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5 => '0',
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6 => '1',
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7 => '2 (Telephone)',
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8 => '3 (Thumb)',
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9 => '4 (Radio)',
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10 => '5 (Standard)',
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11 => '6 (Xtreme)',
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12 => '7 (Insane)',
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13 => '8 (BrainDead)',
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14 => '9',
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15 => '10',
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},
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},
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'Bit088-093' => 'MaxBand',
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'Bit096-111' => 'ReplayGainTrackPeak',
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'Bit112-127' => 'ReplayGainTrackGain',
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'Bit128-143' => 'ReplayGainAlbumPeak',
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'Bit144-159' => 'ReplayGainAlbumGain',
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'Bit179' => {
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Name => 'FastSeek',
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PrintConv => { 0 => 'No', 1 => 'Yes' },
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},
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'Bit191' => {
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Name => 'Gapless',
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PrintConv => { 0 => 'No', 1 => 'Yes' },
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},
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'Bit216-223' => {
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Name => 'EncoderVersion',
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PrintConv => '$val =~ s/(\d)(\d)(\d)$/$1.$2.$3/; $val',
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},
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);
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#------------------------------------------------------------------------------
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# Extract information from an MPC file
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# - Just looks for MPC trailer if FileType is already set
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# Returns: 1 on success, 0 if this wasn't a valid MPC file
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sub ProcessMPC($$)
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{
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my ($et, $dirInfo) = @_;
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# must first check for leading ID3 information
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unless ($$et{DoneID3}) {
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require Image::ExifTool::ID3;
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Image::ExifTool::ID3::ProcessID3($et, $dirInfo) and return 1;
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}
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my $raf = $$dirInfo{RAF};
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my $buff;
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# check MPC signature
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$raf->Read($buff, 32) == 32 and $buff =~ /^MP\+(.)/s or return 0;
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my $vers = ord($1) & 0x0f;
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$et->SetFileType();
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# extract audio information (currently only from version 7 MPC files)
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if ($vers == 0x07) {
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SetByteOrder('II');
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my $pos = $raf->Tell() - 32;
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if ($et->Options('Verbose')) {
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$et->VPrint(0, "MPC Header (32 bytes):\n");
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$et->VerboseDump(\$buff, DataPos => $pos);
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}
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my $tagTablePtr = GetTagTable('Image::ExifTool::MPC::Main');
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my %dirInfo = ( DataPt => \$buff, DataPos => $pos );
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$et->ProcessDirectory(\%dirInfo, $tagTablePtr);
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} else {
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$et->Warn('Audio info currently not extracted from this version MPC file');
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}
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# process APE trailer if it exists
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require Image::ExifTool::APE;
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Image::ExifTool::APE::ProcessAPE($et, $dirInfo);
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::MPC - Read Musepack audio meta information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to extract meta
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information from Musepack (MPC) audio files.
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=head1 AUTHOR
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Copyright 2003-2018, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://www.musepack.net/>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/MPC Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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