Class: Deftones::Effects::Chebyshev

Inherits:
Core::Effect show all
Includes:
Oversampling
Defined in:
lib/deftones/effect/chebyshev.rb

Constant Summary

Constants included from Oversampling

Oversampling::OVERSAMPLE_FACTORS

Instance Attribute Summary collapse

Attributes included from Oversampling

#oversample

Attributes inherited from Core::Effect

#wet

Instance Method Summary collapse

Methods included from Oversampling

#ensure_oversample_state, #process_oversampled

Methods inherited from Core::Effect

#multichannel_process?, #normalize_channel_output, #process, #process_effect_block

Constructor Details

#initialize(order: 3, oversample: 1, **options) ⇒ Chebyshev

Returns a new instance of Chebyshev.



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# File 'lib/deftones/effect/chebyshev.rb', line 10

def initialize(order: 3, oversample: 1, **options)
  super(**options)
  @order = [order.to_i, 1].max
  self.oversample = oversample
end

Instance Attribute Details

#order ⇒ Object

Returns the value of attribute order.



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# File 'lib/deftones/effect/chebyshev.rb', line 8

def order
  @order
end

Instance Method Details

#chebyshev(value, order) ⇒ Object (private) 



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# File 'lib/deftones/effect/chebyshev.rb', line 24

def chebyshev(value, order)
  return value if order == 1

  previous = value
  current = (2.0 * value * value) - 1.0
  return current if order == 2

  3.upto(order) do
    next_value = (2.0 * value * current) - previous
    previous = current
    current = next_value
  end
  current
end

#process_effect(input_buffer, _num_frames, _start_frame, _cache, channel_index: 0) ⇒ Object (private) 



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# File 'lib/deftones/effect/chebyshev.rb', line 18

def process_effect(input_buffer, _num_frames, _start_frame, _cache, channel_index: 0)
  process_oversampled(input_buffer, channel_index) do |sample|
    chebyshev(sample.clamp(-1.0, 1.0), @order)
  end
end