Class: Sidtool::Synth

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(start_frame) ⇒ Synth

Returns a new instance of Synth.



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# File 'lib/sidtool/synth.rb', line 11

def initialize(start_frame)
  @start_frame = start_frame
  @controls = []
end

Instance Attribute Details

#attack ⇒ Object

Returns the value of attribute attack.



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# File 'lib/sidtool/synth.rb', line 5

def attack
  @attack
end

#controls ⇒ Object (readonly)

Returns the value of attribute controls.



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# File 'lib/sidtool/synth.rb', line 9

def controls
  @controls
end

#decay ⇒ Object

Returns the value of attribute decay.



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# File 'lib/sidtool/synth.rb', line 6

def decay
  @decay
end

#release ⇒ Object

Returns the value of attribute release.



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# File 'lib/sidtool/synth.rb', line 8

def release
  @release
end

#start_frame ⇒ Object (readonly)

Returns the value of attribute start_frame.



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# File 'lib/sidtool/synth.rb', line 3

def start_frame
  @start_frame
end

#sustain_length ⇒ Object (readonly)

Returns the value of attribute sustain_length.



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# File 'lib/sidtool/synth.rb', line 7

def sustain_length
  @sustain_length
end

#waveform ⇒ Object

Returns the value of attribute waveform.



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# File 'lib/sidtool/synth.rb', line 4

def waveform
  @waveform
end

Instance Method Details

#frequency=(frequency) ⇒ Object 



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# File 'lib/sidtool/synth.rb', line 16

def frequency=(frequency)
  if @frequency
    previous_midi, current_midi = sid_frequency_to_nearest_midi(@frequency), sid_frequency_to_nearest_midi(frequency)
    @controls << [STATE.current_frame, current_midi] if previous_midi != current_midi
  end
  @frequency = frequency
end

#release! ⇒ Object 



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# File 'lib/sidtool/synth.rb', line 24

def release!
  return if released?

  @released_at = STATE.current_frame
  length_of_attack_decay_sustain = (STATE.current_frame - @start_frame) / FRAMES_PER_SECOND
  if length_of_attack_decay_sustain < @attack
    @attack = length_of_attack_decay_sustain
    @decay, @sustain_length = 0, 0
  elsif length_of_attack_decay_sustain < @attack + @decay
    @decay = length_of_attack_decay_sustain - @attack
    @sustain_length = 0
  else
    @sustain_length = length_of_attack_decay_sustain - @attack - @decay
  end
end

#released? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sidtool/synth.rb', line 40

def released?
  !!@released_at
end

#stop! ⇒ Object 



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# File 'lib/sidtool/synth.rb', line 44

def stop!
  if released?
    @release = [@release, (STATE.current_frame - @released_at) / FRAMES_PER_SECOND].min
  else
    @release = 0
    release!
  end
end

#to_a ⇒ Object 



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# File 'lib/sidtool/synth.rb', line 53

def to_a
  [@start_frame, tone, @waveform, @attack.round(3), @decay.round(3), @sustain_length.round(3), @release.round(3), @controls]
end

#tone ⇒ Object 



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# File 'lib/sidtool/synth.rb', line 57

def tone
  sid_frequency_to_nearest_midi(@frequency)
end