Use LED strip as a VU-Meter

My Mopidy server is running on a Raspberry Pi and I was wondering of the best way to intercept and alter the audio stream in order to display the peak levels with a LED strip (VU-Meter). Any pointers to this topic are appreciated.

I came accross Ncmpcpp running along Mopidy [1] which includes a visualizer running in the CLI. Would this be a possibility to capture the data there to drive the LEDs?

Another hint I found is to pipe the data into a FiFo/file and do (I assume) additional processing.

[1] Playing Music with Mopidy and Ncmpcpp | Digital Neanderthal

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