hue_expts.rb

song_to_hue.rb

require 'hue'
require 'waveform'

audio = RubyAudio::Sound.open(source)
length = audio.info.length.to_i
frames = audio.info.frames
sample_period = 1
frames_per_sample = frames / sample_period


frame_samples = []

frames_read = 0
sample = RubyAudio::Buffer.new("float", frames_per_sample, audio.info.channels)
audio.seek 0

while(frames_read = audio.read(sample)) > 0
  frame_samples << rms(sample, audio.info.channels)
end


attrs = frames_samples.map{|f| [(f[0]*65500).to_i,(f[1]*255).to_i]}

c = Hue::Client.new
l = c.lights.first

attrs.length.times do |i|
  l.set_state({hue: attrs[i][0], bri: attrs[i][1], transitiontime: 10})
  sleep(sample_period)
end

puts "Yay!"

def rms(frames, channels=1)
  rms_frame = []
  (0..channels-1).each do |channel|
    rms_frame << channel_rms(frames, channel)
  end
  rms_frame
end

def channel_rms(frames, channel=0)
  Math.sqrt(frames.inject(0.0){ |sum, frame| sum += (frame ? Array(frame)[channel] ** 2 : 0) } / frames.size)
end