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Info(3) |
User Contributed Perl Documentation |
Info(3) |
MP3::Info - Manipulate / fetch info from MP3 audio files
#!perl -w
use MP3::Info;
my $file = 'Pearls_Before_Swine.mp3';
set_mp3tag($file, 'Pearls Before Swine', q"77's",
'Sticks and Stones', '1990',
q"(c) 1990 77's LTD.", 'rock & roll');
my $tag = get_mp3tag($file) or die "No TAG info";
$tag->{GENRE} = 'rock';
set_mp3tag($file, $tag);
my $info = get_mp3info($file);
printf "$file length is %d:%d\n", $info->{MM}, $info->{SS};
my $mp3 = new MP3::Info $file;
$mp3->title('Perls Before Swine');
printf "$file length is %s, title is %s\n",
$mp3->time, $mp3->title;
- $mp3 = MP3::Info->new(FILE)
- OOP interface to the rest of the module. The same keys available via
get_mp3info and get_mp3tag are available via the returned object (using
upper case or lower case; but note that all-caps "VERSION" will
return the module version, not the MP3 version).
Passing a value to one of the methods will set the value for
that tag in the MP3 file, if applicable.
- use_mp3_utf8([STATUS])
- Tells MP3::Info to (or not) return TAG info in UTF-8. TRUE is 1, FALSE is
0. Default is TRUE, if available.
Will only be able to turn it on if Encode is available. ID3v2
tags will be converted to UTF-8 according to the encoding specified in
each tag; ID3v1 tags will be assumed Latin-1 and converted to UTF-8.
Function returns status (TRUE/FALSE). If no argument is
supplied, or an unaccepted argument is supplied, function merely returns
status.
This function is not exported by default, but may be exported
with the ":utf8" or
":all" export tag.
- use_winamp_genres()
- Puts WinAmp genres into @mp3_genres and
%mp3_genres (adds 68 additional genres to the
default list of 80). This is a separate function because these are
non-standard genres, but they are included because they are widely used.
You can import the data structures with one of:
use MP3::Info qw(:genres);
use MP3::Info qw(:DEFAULT :genres);
use MP3::Info qw(:all);
- remove_mp3tag (FILE [, VERSION, BUFFER])
- Can remove ID3v1 or ID3v2 tags. VERSION should be
1 for ID3v1 (the default),
2 for ID3v2, and
"ALL" for both.
For ID3v1, removes last 128 bytes from file if those last 128
bytes begin with the text 'TAG'. File will be 128 bytes shorter.
For ID3v2, removes ID3v2 tag. Because an ID3v2 tag is at the
beginning of the file, we rewrite the file after removing the tag data.
The buffer for rewriting the file is 4MB. BUFFER (in bytes) ca change
the buffer size.
Returns the number of bytes removed, or -1 if no tag removed,
or undef if there is an error.
- set_mp3tag (FILE, TITLE, ARTIST, ALBUM, YEAR, COMMENT, GENRE [,
TRACKNUM])
- set_mp3tag (FILE, $HASHREF)
- Adds/changes tag information in an MP3 audio file. Will clobber any
existing information in file.
Fields are TITLE, ARTIST, ALBUM, YEAR, COMMENT, GENRE. All
fields have a 30-byte limit, except for YEAR, which has a four-byte
limit, and GENRE, which is one byte in the file. The GENRE passed in the
function is a case-insensitive text string representing a genre found in
@mp3_genres.
Will accept either a list of values, or a hashref of the type
returned by "get_mp3tag".
If TRACKNUM is present (for ID3v1.1), then the COMMENT field
can only be 28 bytes.
ID3v2 support may come eventually. Note that if you set a tag
on a file with ID3v2, the set tag will be for ID3v1[.1] only, and if you
call "get_mp3tag" on the file, it will
show you the (unchanged) ID3v2 tags, unless you specify ID3v1.
- get_mp3tag (FILE [, VERSION, RAW_V2, APE2])
- Returns hash reference containing tag information in MP3 file. The keys
returned are the same as those supplied for
"set_mp3tag", except in the case of
RAW_V2 being set.
If VERSION is 1, the information is
taken from the ID3v1 tag (if present). If VERSION is
2, the information is taken from the ID3v2 tag
(if present). If VERSION is not supplied, or is false, the ID3v1 tag is
read if present, and then, if present, the ID3v2 tag information will
override any existing ID3v1 tag info.
If RAW_V2 is 1, the raw ID3v2 tag data
is returned, without any manipulation of text encoding. The key name is
the same as the frame ID (ID to name mappings are in the global
%v2_tag_names).
If RAW_V2 is 2, the ID3v2 tag data is
returned, manipulating for Unicode if necessary, etc. It also takes
multiple values for a given key (such as comments) and puts them in an
arrayref.
If APE is 1, an APE tag will be
located before all other tags.
If the ID3v2 version is older than ID3v2.2.0 or newer than
ID3v2.4.0, it will not be read.
Strings returned will be in Latin-1, unless UTF-8 is specified
(use_mp3_utf8), (unless RAW_V2 is 1).
Also returns a TAGVERSION key, containing the ID3 version used
for the returned data (if TAGVERSION argument is
0, may contain two versions).
- get_mp3info (FILE)
- Returns hash reference containing file information for MP3 file. This data
cannot be changed. Returned data:
VERSION MPEG audio version (1, 2, 2.5)
LAYER MPEG layer description (1, 2, 3)
STEREO boolean for audio is in stereo
VBR boolean for variable bitrate
BITRATE bitrate in kbps (average for VBR files)
FREQUENCY frequency in kHz
SIZE bytes in audio stream
OFFSET bytes offset that stream begins
SECS total seconds
MM minutes
SS leftover seconds
MS leftover milliseconds
TIME time in MM:SS
COPYRIGHT boolean for audio is copyrighted
PADDING boolean for MP3 frames are padded
MODE channel mode (0 = stereo, 1 = joint stereo,
2 = dual channel, 3 = single channel)
FRAMES approximate number of frames
FRAME_LENGTH approximate length of a frame
VBR_SCALE VBR scale from VBR header
On error, returns nothing and sets
$@.
If you find a bug, please send me a patch (see the project page in "SEE
ALSO"). If you cannot figure out why it does not work for you, please put
the MP3 file in a place where I can get it (preferably via FTP, or HTTP, or
.Mac iDisk) and send me mail regarding where I can get the file, with a
detailed description of the problem.
If I download the file, after debugging the problem I will not
keep the MP3 file if it is not legal for me to have it. Just let me know if
it is legal for me to keep it or not.
- ID3v2 Support
- Still need to do more for reading tags, such as using Compress::Zlib to
decompress compressed tags. But until I see this in use more, I won't
bother. If something does not work properly with reading, follow the
instructions above for troubleshooting.
ID3v2 writing is coming soon.
- Get data from scalar
- Instead of passing a file spec or filehandle, pass the data itself. Would
take some work, converting the seeks, etc.
- Padding bit ?
- Do something with padding bit.
- Test suite
- Test suite could use a bit of an overhaul and update. Patches very
welcome.
- Revamp getset.t. Test all the various get_mp3tag args.
- Test Unicode.
- Test OOP API.
- Test error handling, check more for missing files, bad MP3s, etc.
- Other VBR
- Right now, only Xing VBR is supported.
Edward Allen, Vittorio Bertola, Michael Blakeley, Per Bolmstedt, Tony Bowden,
Tom Brown, Sergio Camarena, Chris Dawson, Kevin Deane-Freeman, Anthony
DiSante, Luke Drumm, Kyle Farrell, Jeffrey Friedl, brian d foy, Ben
Gertzfield, Brian Goodwin, Andy Grundman, Todd Hanneken, Todd Harris, Woodrow
Hill, Kee Hinckley, Roman Hodek, Ilya Konstantinov, Peter Kovacs, Johann
Lindvall, Alex Marandon, Peter Marschall, michael, Trond Michelsen, Dave
O'Neill, Christoph Oberauer, Jake Palmer, Andrew Phillips, David Reuteler,
John Ruttenberg, Matthew Sachs, scfc_de, Hermann Schwaerzler, Chris Sidi,
Roland Steinbach, Brian S. Stephan, Stuart, Dan Sully, Jeffery Sumler, Predrag
Supurovic, Bogdan Surdu, Pierre-Yves Thoulon, tim, Pass F. B. Travis, Tobias
Wagener, Ronan Waide, Andy Waite, Ken Williams, Ben Winslow, Meng Weng Wong,
Justin Fletcher.
Dan Sully <daniel | at | cpan.org> & Logitech.
Chris Nandor <pudge@pobox.com>, http://pudge.net/
Copyright (c) 2006-2008 Dan Sully & Logitech. All rights reserved.
Copyright (c) 1998-2005 Chris Nandor. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
- Logitech/Slim Devices
-
http://www.slimdevices.com/
- mp3tools
-
http://www.zevils.com/linux/mp3tools/
- mpgtools
-
http://www.dv.co.yu/mpgscript/mpgtools.htm
http://www.dv.co.yu/mpgscript/mpeghdr.htm
- mp3tool
-
http://www.dtek.chalmers.se/~d2linjo/mp3/mp3tool.html
- ID3v2
-
http://www.id3.org/
- Xing Variable Bitrate
-
http://www.xingtech.com/support/partner_developer/mp3/vbr_sdk/
- MP3Ext
-
http://rupert.informatik.uni-stuttgart.de/~mutschml/MP3ext/
- Xmms
-
http://www.xmms.org/
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