Class: Deftones::Analysis::FFT

Inherits:
Core::AudioNode show all
Defined in:
lib/deftones/analysis/fft.rb

Instance Attribute Summary

Attributes inherited from Core::AudioNode

#context, #input

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Core::AudioNode

#>>, #attach_destination, #attach_source, #block_time, #chain, #channel_count, #channel_count_mode, #channel_interpretation, #connect, #connected?, #default_input_channels, #default_output_channels, #destination_for_connection, #detach_all_destinations, #detach_destination, #detach_source, #disconnect, #dispose, #disposed?, #fan, #get, #immediate, #input_for_index, #inputs, #mix_source_blocks, #name, #normalize_connection_index, #normalize_output_block, #now, #number_of_inputs, #number_of_outputs, #output, #output_for_connection, #output_for_index, #outputs, #raise_connection_index_error!, #reaches_node?, #render, #render_block, #sample_time, #set, #to_destination, #to_frequency, #to_master, #to_midi, #to_output, #to_s, #to_seconds, #to_ticks, #uses_legacy_render_for_block?, #validate_connectable!, #validate_connection_index!

Constructor Details

#initialize(size: 1024, smoothing: 0.8, return_type: :float, normal_range: false, min_decibels: -100.0,, max_decibels: 0.0, context: Deftones.context) ⇒ FFT

Returns a new instance of FFT.



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# File 'lib/deftones/analysis/fft.rb', line 30

def initialize(size: 1024, smoothing: 0.8, return_type: :float, normal_range: false,
               min_decibels: -100.0, max_decibels: 0.0, context: Deftones.context)
  super(context: context)
  @delegate = Analysis::Analyser.new(
    size: size,
    type: :fft,
    smoothing: smoothing,
    return_type: return_type,
    normal_range: normal_range,
    min_decibels: min_decibels,
    max_decibels: max_decibels,
    context: context
  )
end

Class Method Details

.decibels(samples, floor: -100.0)) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 24

def self.decibels(samples, floor: -100.0)
  magnitudes(samples).map do |magnitude|
    [Deftones.gain_to_db([magnitude, 1.0e-12].max), floor.to_f].max
  end
end

.magnitudes(samples) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 6

def self.magnitudes(samples)
  size = samples.length
  half = size / 2

  Array.new(half) do |bin|
    real = 0.0
    imaginary = 0.0

    samples.each_with_index do |sample, index|
      angle = (2.0 * Math::PI * bin * index) / size
      real += sample * Math.cos(angle)
      imaginary -= sample * Math.sin(angle)
    end

    Math.sqrt((real * real) + (imaginary * imaginary)) / [size, 1].max
  end
end

Instance Method Details

#get_value ⇒ Object Also known as: getValue 



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# File 'lib/deftones/analysis/fft.rb', line 93

def get_value
  @delegate.get_value
end

#max_decibels ⇒ Object Also known as: maxDecibels 



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# File 'lib/deftones/analysis/fft.rb', line 85

def max_decibels
  @delegate.max_decibels
end

#max_decibels=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 89

def max_decibels=(value)
  @delegate.max_decibels = value
end

#maxDecibels=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 115

def maxDecibels=(value)
  self.max_decibels = value
end

#min_decibels ⇒ Object Also known as: minDecibels 



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# File 'lib/deftones/analysis/fft.rb', line 77

def min_decibels
  @delegate.min_decibels
end

#min_decibels=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 81

def min_decibels=(value)
  @delegate.min_decibels = value
end

#minDecibels=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 111

def minDecibels=(value)
  self.min_decibels = value
end

#multichannel_process? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/deftones/analysis/fft.rb', line 123

def multichannel_process?
  true
end

#normal_range ⇒ Object Also known as: normalRange 



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# File 'lib/deftones/analysis/fft.rb', line 69

def normal_range
  @delegate.normal_range
end

#normal_range=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 73

def normal_range=(value)
  @delegate.normal_range = value
end

#normalRange=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 107

def normalRange=(value)
  self.normal_range = value
end

#process(input_buffer, num_frames, start_frame, cache) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 119

def process(input_buffer, num_frames, start_frame, cache)
  @delegate.process(input_buffer, num_frames, start_frame, cache)
end

#return_type ⇒ Object Also known as: returnType 



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# File 'lib/deftones/analysis/fft.rb', line 61

def return_type
  @delegate.return_type
end

#return_type=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 65

def return_type=(value)
  @delegate.return_type = value
end

#returnType=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 103

def returnType=(value)
  self.return_type = value
end

#size ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 45

def size
  @delegate.size
end

#size=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 49

def size=(value)
  @delegate.size = value
end

#smoothing ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 53

def smoothing
  @delegate.smoothing
end

#smoothing=(value) ⇒ Object 



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# File 'lib/deftones/analysis/fft.rb', line 57

def smoothing=(value)
  @delegate.smoothing = value
end