Class: Deftones::Component::Gate

Inherits:
Deftones::Core::AudioNode show all
Defined in:
lib/deftones/component/gate.rb

Instance Attribute Summary collapse

Attributes inherited from Deftones::Core::AudioNode

#context, #input

Instance Method Summary collapse

Methods inherited from Deftones::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(threshold: -40.0,, release: 0.05, context: Deftones.context) ⇒ Gate

Returns a new instance of Gate.



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# File 'lib/deftones/component/gate.rb', line 8

def initialize(threshold: -40.0, release: 0.05, context: Deftones.context)
  super(context: context)
  @threshold = threshold.to_f
  @release = release.to_f
  @gain = []
end

Instance Attribute Details

#release ⇒ Object

Returns the value of attribute release.



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# File 'lib/deftones/component/gate.rb', line 6

def release
  @release
end

#threshold ⇒ Object

Returns the value of attribute threshold.



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# File 'lib/deftones/component/gate.rb', line 6

def threshold
  @threshold
end

Instance Method Details

#ensure_gain_state(channels) ⇒ Object (private) 



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# File 'lib/deftones/component/gate.rb', line 40

def ensure_gain_state(channels)
  required = [channels.to_i, 1].max
  @gain.fill(0.0, @gain.length...required)
end

#gate(sample, channel_index) ⇒ Object (private) 



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# File 'lib/deftones/component/gate.rb', line 30

def gate(sample, channel_index)
  level_db = 20.0 * Math.log10([sample.abs, 1.0e-9].max)
  target = level_db >= @threshold ? 1.0 : 0.0
  smoothing = 1.0 / [(@release * context.sample_rate), 1.0].max
  gain = @gain[channel_index]
  gain += (target - gain) * smoothing
  @gain[channel_index] = gain
  sample * gain
end

#multichannel_process? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/deftones/component/gate.rb', line 15

def multichannel_process?
  true
end

#process(input_block, num_frames, _start_frame, _cache) ⇒ Object 



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# File 'lib/deftones/component/gate.rb', line 19

def process(input_block, num_frames, _start_frame, _cache)
  ensure_gain_state(input_block.channels)
  Core::AudioBlock.from_channel_data(
    input_block.channel_data.each_with_index.map do |channel, channel_index|
      Array.new(num_frames) { |index| gate(channel[index], channel_index) }
    end
  )
end