A Demonstration of Minim in Ruby-Processing

sounder.rb

# Sounder sounds for class
# Requires an active microphone to pick up anything

require 'ruby-processing'

class MinimTest < Processing::App
  load_library "minim"
  import "ddf.minim"
  import "ddf.minim.analysis"
  
  def setup
    @minim = Minim.new(self)
    @input = @minim.get_line_in
    @fft = FFT.new(@input.left.size, 44100)
    @beat = BeatDetect.new
    @radius = 0
  end
  
  def draw
    background 0
    stroke 255
    draw_beat
    draw_waveform
    draw_frequency
  end
  
  def draw_beat
    @beat.detect @input.left
    @radius = 100 if @beat.is_onset
    @radius *= 0.95
    oval width/2, height/2, @radius, @radius
  end
  
  def draw_waveform
    scale = height / 4
    (@input.buffer_size - 1).times do |i|
      line(i,   scale + @input.left.get(i)*scale, 
           i+1, scale + @input.left.get(i+1) * scale)
    end
  end
  
  def draw_frequency
    @fft.forward @input.left
    scale = width / 50
    50.times do |i|
      @fft.scale_band i, i * 0.35 + 1
      @fft.scale_band i, 0.3
      line i*scale, height, i*scale, height - @fft.get_band(i)*4
    end
  end
end

MinimTest.new :width => 700, :height => 700, :title => "Minim Test"