Audio processing

[greglook]

Use Minim (or some equivalent library) to provide audio-processing to the wonderdome. This will ideally provide both beat-detection and very basic frequency power bands via the Fourier transform. This is likely to be performance intensive, so will need lots of tuning.

This component would be another type of input, which would send events like the following:

{:type :audio/beat
 :power 0.8444}

{:type :audio/freq
 :elapsed 138 ; ms
 :power [0.662, 0.328, 0.153, 0.989, ...]}

[greglook]

Looks like someone put 2.2.0 on clojars already: https://clojars.org/ddf.minim

[greglook]

Needs to be fleshed out more, but basic audio input is in! c187014

Next steps:

• Wire it up to the rest of the system during construction.
• Polish the test harness code.
• Experiment with windowing functions in the FFT.
• Experiment with rolling-average power levels rather than instantaneous values.

[greglook]

Two more tasks:

• Install the physical microphone
• Write a tunes mode which responds to audio input as a proof-of-concept