123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156 |
- #------------------------------------------------------------------------------
- # 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 2003-2016, 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
|