Extract Wavelength from MP3 as an Image

Question

Are there any good libraries that can help convert an MP3 into an image of its wavelengths (I think that's the proper term). What I'm looking for is a way to generate the wavelengths of MP3s server-side like is done on Souncloud: http://soundcloud.com/smixx/takin-vc-money-money-cash-ipos

What would be the best approach to extact that type of image from an audio file?

Answer 1

This would be the best response from the community: http://andrewfreiday.com/2010/04/29/generating-mp3-waveforms-with-php/

The correct term is WAVEFORM that's what you see @soundcloud. From what I've seen, the PHP script is pretty lightweight and awesome!

BTW: I just realized that the stackoverflow question points to the same PHP code @andrewfreiday

EDIT: Just a FYI, I started playing with node.js for a while now and while I was making a simple MP3 player I started using this packaged for the waveform.

https://www.npmjs.com/package/waveform-data