Input sound and determine the amplitude/volume

[Altera_Forum]

Okay, so I'm using the DE2 board and I want to be able to do 2 things. 

1)to either input music from a file or the input jack (blue input jack) 2)and then process it so I can determine the magnitude of the music   Basically what I want is to flash an LED when the amplitude of the music is greater than x. So basically I can then make one of those sound bars or volume bars where more LEDs light up when the sound is loud, but only a few when the sound is soft.   I'm a beginner at this stuff and only know like basic coding statements, and making simple code like counters, adders, and simple state machines so the more detailed you can be the better.   I tried looking at some of the DE2 demos and looking online, but I couldn't figure out how to do the sound input or finding it's amplitude.   Thanks.

[Altera_Forum]

source -> analog amp -> line in of DE2 , formerly calibrated to 0dBfs 

line in -> audio codec -> codec interface core (operncores) -> obtain input data input -> true RMS- meassuring -> sampler -> hold circuit - > monitoring  so you will have to implement a codec interface, the RMS-circiut, the sampler (most probably a FIR type with 10ms) and the hold circiut for monitoring for eye observation, last but not least monitoring can be done with a VGA core instead of LED bars.  my 1920x1024 screen at the bottom of the page: http://www.96khz.org/htm/cyclone3platform.htm It can do both volume monitoring of the master, the group channels and