waveform processing

Hi all, Not sure if somebody is familiar with this, but here we go. I need to process 20 to 45 minute long music files (mp3, wav and aiff) with different bit rates to a png waveform. You can see the example on soundcloud.com. Is there anything in Java that supports this functionality for the different filetypes? Or does anybody knows a good packages to do this? Any pointers are appreciated! Michael