Getting the Audio Stereo Mixer or Line In Input

[Nikhil Wason]

I wanna make a standalone audio visualization. For that i would need the waveform or the amplitude of samples of the audio being played. Is there ne way in which i can get the waveform or the amplitudes of samples of the media playing on the computer through stereo mixer and/or line-in?? This is similar to the way sound recorder can record ne audio being played by any application on the computer. Pls hlp. -- Nikhil