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