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Contents
# frozen_string_literal: true
module ColtraneSynth
class Base
attr_reader :device, :buffer
SAMPLE_RATE = 44_000
def self.play(something, duration = 1.0)
new.play(*extract_frequencies(something), duration: duration)
end
def initialize
@device = CoreAudio.default_output_device
end
def play(*freqs, duration: 1.0)
@device = CoreAudio.default_output_device
buffer = @device.output_loop(SAMPLE_RATE)
SAMPLE_RATE.times do |i|
sound = freqs.reduce(0) { |sum, freq| Math.sin(phase(freq) * i) + sum }
buffer[i] = (sound * (0x6AFF / freqs.size)).round
end
buffer.start
sleep duration
buffer.stop
end
private
def self.extract_frequencies(arg)
case arg
when Coltrane::Chord then arg.notes.map { |n| n.frequency.octave(4).to_f }
when Coltrane::PitchClass then arg.frequency.octave(4).to_f
when Coltrane::Voicing then arg.frequencies.map(&:to_f)
end
end
def sine_wave(freq, i)
Math.sin(phase(freq) * i)
end
def phase(freq)
(Math::PI * 2.0 * freq) / SAMPLE_RATE.to_f
end
end
end
Version data entries
23 entries across 23 versions & 1 rubygems