This is an OpenGL bars visualization plugin (as seen in XMMS and XBMC/Kodi). It’s adapted from the jack_glbars project by Nedko Arnaudov. glBars works as a JACK standalone and audio plugin (LV2 or VST).

github.com/DISTRHO/glBars
distrho.sourceforge.io/plugins
github.com/DISTRHO/DPF-Plugins