Monday, March 6, 2000 Major update to this version is variable bitrate (VBR) support and a name change; it is now MP3::Info. A wrapper module is included so scripts calling MPEG::MP3Info will still work. Included tests don't yet test ID3v2 or VBR support. This archive can always be obtained from: http://www.perl.com/CPAN/authors/id/CNANDOR/ http://www.perl.com/CPAN/modules/by-module/MPEG/ Mac users: The file is a tarred, gzipped file. Use Stuffit Expander or a similar program (like my cpan-mac stuff, also in the CNANDOR directory) to get at the archive. Please let me know how well it does(n't) work, and any changes you'd like to see. Thanks to all of the people who have sent me feedback and ideas. If something you want still remains unimplemented, let me know. #============================================================================ NAME MP3::Info - Manipulate / fetch info from MP3 audio files SYNOPSIS #!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", $info->{MM}, $info->{SS}; DESCRIPTION use_winamp_genres() Puts WinAmp genres into `@mp3_genres' and `%mp3_genres'. 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) Removes last 128 bytes from file if those last 128 bytes begin with the text `TAG'. File will be 128 bytes shorter. Returns undef if no existing TAG found, 1 on successful removal of TAG. 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 will come eventually. get_mp3tag (FILE [, VERSION, RAW_V2]) Returns hash reference containing tag information in MP3 file. Same info as described in `set_mp3tag'. 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, the ID3v1 tag is read if present, and then, if present, the ID3v2 tag information will override any existing ID3v1 tag info. If the ID3v2 version is older than ID3v2.3.0, it will not be read (and a warning will be issued if -w is on). If RAW_V2 is false or not supplied and VERSION is `2', only the tags corresponding to ID3v1 tags are returned, with the same keys in the returned hashref. If RAW_V2 is true and VERSION is `2', `get_mp3tag' will return a hash of tag four-character IDs and their data. Tag IDs and their meanings are in the global hash (not exported) `%v2_tag_names'. my $tag = get_mp3tag('mysong.mp3', 2, 1); # ID3v2, raw ID3v2 tags for (keys %$tag) { printf "%s => %s\n", $MP3::Info::v2_tag_names{$_}, $tag->{$_}; } get_mp3info (FILE) Returns hash reference containing file information for MP3 file. This data cannot be changed. Returned data includes MP3 version (VERSION), total time in minutes (MM) and seconds (SS), boolean for STEREO, MPEG layer (LAYER), BITRATE, MODE, boolean for COPYRIGHT, and FREQUENCY. Variable bitrates not yet supported. See the section on "TODO". TROUBLESHOOTING If you find a bug, please send me a patch. 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) 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 ot keep it or not. TODO ID3v2 Support First go at adding support for reading ID3v2 tags. Still need to do more, such as using Compress::Zlib to decompress compressed tags. But until I see this in use more, I won't bother. I might not be able to support Unicode at all, until Perl supports 16-bit Unicode. If something does not work properly with reading, follow the instructions above for troubleshooting. Still need to add support for writing ID3v2 tags, and work on API a bit. HISTORY v0.80, Monday, March 6, 2000 Better stripping of bad data (after nulls) in ID3 tags (Dave O'Neill) Fixed VERSION in get_mp3info to properly return 2 when appropriate. (Bogdan Surdu) Added VBR support. Average bitrate is returned as BITRATE, and minutes and seconds (MM and SS) should be accurate. (Andy Waite for pointer to MP3Ext) Made time calculation better overall. Made MP3 header validation routines more comprehensive. (Matthew Sachs for pointer to xmms source) Changed name to MP3::Info (with wrapper still named MP3::Info). v0.71, Thursday, July 8, 1999 Several fixes to ID3v2 support unpack unsigned instead of signed, don't bail out after 4096-byte offsets on long ID3v2 headers. Thanks much to Matthew Sachs. v0.70, Saturday, July 3, 1999 Added preliminary ID3v2 reading support in `get_mp3tag'. Thanks much to Tom Brown. v0.64, Thursday, July 1, 1999 Found bug in checking TRACKNUM parameter, used \d instead of \d+. Only gives spurious warnings, doesn't affect anything else. Cleaned up a bit, prepare for impending ID3v2 support. NOTE: truncate() broken in some builds of ActivePerl (517, maybe others). No changes to module to fix problem. (Brian Goodwin) v0.63, Friday, April 30, 1999 Added ID3v1.1 support. (Trond Michelsen, Pass F. B. Travis) Added 255 (\xFF) as default genre. (Andrew Phillips) I think I fixed bug relating to spaces in ID3v2 headers. (Tom Brown) v0.62, Sunday, March 7, 1999 Doc updates. Fix small unnoticable bug where ID3v2 offset is tag size plus 10, not just tag size. Not publickly released. v0.61, Monday, March 1, 1999 Fixed problem of not removing nulls on return from `get_mp3tag' (was using spaces for padding before ... now trailing whitespace and all nulls are removed before returning tag info). Made tests more extensive (more for my own sanity when making all these changes than to make sure it works on other platforms and machines :). v0.60, Sunday, February 28, 1999 Cleaned up a lot of stuff, added more comments, made `get_mp3info' much faster and much more reliable, and added recognition of ID3v2 headers. (Tom Brown) v0.52, Sunday, February 21, 1999 Fixed problem in `get_mp3tag' that changed value of `$_' in caller (Todd Hanneken). v0.51, Saturday, February 20, 1999 Fixed problem with `%winamp_genres' having the wrong numbers (Matthew Sachs). v0.50, Friday, February 19, 1999 Added `remove_mp3tag'. Addeed VERSION to the hash returned by `get_mp3info', and fixed a bug where STEREO was not being set correctly. Export all genre data structures on request. Added `use_winamp_genres' to use WinAmp genres. (Roland Steinbach) Added a `$MPEG::MP3Info::try_harder' (`$MP3::Info::try_harder') variable that will try harder to find the MP3 header in a file. False by default. Can take a long time to fail, but should find most headers at any offsets if set to true. Thanks to Matthew Sachs for his input and fixes, and for mp3tools. v0.20, Saturday, October 17, 1998 Changed name from `MPEG::MP3Tag' to `MPEG::MP3Info', because it does more than just TAG stuff now. Made header stuff even more reliable. Lots of help and testing from Meng Weng Wong again. :-) v0.13, Thursday, October 8, 1998 Had some problems with header verification, got some code from Predrag Supurovic with his mpgtools. Great stuff. Also did some looping to find a header if it is not in the "right" place. I did what I think it is a smart way to do it, since some files have the header as far down as 2 kbytes into the file. First, I look at position 0, then at position 36 (a position where I have found many headers), then I start at 0 again and jump in 128-byte chunks. Once I do that a bunch of times, I go back at the beginning and try at 0 and go ahead in 1-byte chunks for a bunch more times. If you have an MP3 that has the header begin at an odd place like byte 761, then I suggest you strip out the junk before the header begins. :-) v0.12, Friday, October 2, 1998 Added `get_mp3info'. Thanks again to mp3tool source from Johann Lindvall, because I basically stole it straight (after converting it from C to Perl, of course). I did everything I could to find the header info, but if anyone has valid MP3 files that are not recognized, or has suggestions for improvement of the algorithms, let me know. v0.04, Tuesday, September 29, 1998 Changed a few things, replaced a regex with an `unpack'. (Meng Weng Wong) v0.03, Tuesday, September 8, 1998 First public release. THANKS Johann Lindvall, Meng Weng Wong , Predrag Supurovic , Matthew Sachs , Peter Kovacs , Roland Steinbach , Todd Hanneken , Tom Brown , Andrew Phillips , Trond Michelsen , Pass F. B. Travis , Vittorio Bertola , Brian Goodwin , Bogdan Surdu , Andy Waite , Chris Sidi , Luke Drumm , Dave O'Neill , Edward Allen . AUTHOR AND COPYRIGHT Chris Nandor , http://pudge.net/ Copyright (c) 2000 Chris Nandor. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the Artistic License, distributed with Perl. SEE ALSO mp3tools http://www.zevils.com/linux/mp3tools/ mpgtools http://www.dv.co.yu/mp3list/mpgtools.htm http://www.dv.co.yu/mp3list/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/ VERSION v0.80, Monday, March 6, 2000 #============================================================================