Class: ColtraneSynth::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/coltrane/synth/base.rb

Constant Summary collapse

SAMPLE_RATE = 
44_000

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Base

Returns a new instance of Base.



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# File 'lib/coltrane/synth/base.rb', line 13

def initialize
  @device = CoreAudio.default_output_device
end

Instance Attribute Details

#buffer ⇒ Object (readonly)

Returns the value of attribute buffer.



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# File 'lib/coltrane/synth/base.rb', line 5

def buffer
  @buffer
end

#device ⇒ Object (readonly)

Returns the value of attribute device.



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# File 'lib/coltrane/synth/base.rb', line 5

def device
  @device
end

Class Method Details

.play(something, duration = 1.0) ⇒ Object 



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# File 'lib/coltrane/synth/base.rb', line 9

def self.play(something, duration = 1.0)
  new.play(*extract_frequencies(something), duration: duration)
end

Instance Method Details

#play(*freqs, duration: 1.0) ⇒ Object 



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# File 'lib/coltrane/synth/base.rb', line 17

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