MP3SPI is a Java Service Provider Interface that adds MP3
Editor: MP3SPI is a Java Service Provider Interface that adds MP3 (MPEG 1/2/2.5 Layer 1/2/3) audio format support for Java Platform. It supports streaming, ID3v2 frames, Equalizer, .... It is based on JLayer and Tritonus Java libraries.

MP3 support (MPEG 1/2/2.5 Layer 1/2/3). VBR support, ID3v2 frames support.Skip support.Equalizer support.This release targets J2SE 1.3 and 1.4 but it provides audio properties that will be available in J2SE 1.5 :
MpegAudioFormat (BitRate, vbr).
MpegAudioFileFormat (duration, title, author, album, date, copyright, comments).It also provides custom properties :
MpegAudioFileFormat (mp3.version.mpeg, mp3.version.layer, mp3.framerate.fps, mp3.id3tagv2, ...).
DecodedMpegAudioInputStream (mp3.Frame.bitrate, mp3.equalizer, ...) JUnit tests included.CPU usage : ~12% under PIII 1Ghz/Win2K+J2SE 1.4.1
FootPrint : ~10MB under WinNT4/Win2K + J2SE 1.4.1
RIFF/MP3 header support added.
FLAC and MAC headers denied.
Skip bug fixed for 320kbps files.
ID3v2.x support improved :
size computation bug fixed.
mp3.id3tag.publisher (TPUB/TPB) added.
mp3.id3tag.orchestra (TPE2/TP2) added.
mp3.id3tag.length (TLEN/TLE) added.
Mark limit increased. you can free download MP3SPI 1.9.4 now.