MP3 amplitude data to XML

I would like someone to develop an application that can be used on Linux which extracts Amplitude data from MP3/Wave files. The script must output amplitude data for every 1/2 second. To extract the amplitude data, it needs to read the MP3 binary data and parse out what’s needed into XML file. An example of a commercial application that does this as one of its functions is FlashAmp ([login to view URL]). However, FlashAmp doesn't run on Linux.