Class: Deftones::Component::MidSideMerge

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

Constant Summary collapse

SQRT_ONE_HALF = 
Math.sqrt(0.5)

Instance Attribute Summary collapse

Attributes inherited from Deftones::Core::AudioNode

#context

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, #multichannel_process?, #name, #normalize_connection_index, #normalize_output_block, #now, #number_of_inputs, #number_of_outputs, #output_for_connection, #output_for_index, #outputs, #process, #raise_connection_index_error!, #reaches_node?, #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(context: Deftones.context) ⇒ MidSideMerge

Returns a new instance of MidSideMerge.



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# File 'lib/deftones/component/mid_side_merge.rb', line 10

def initialize(context: Deftones.context)
  super(context: context)
  @mid = Core::Gain.new(context: context)
  @side = Core::Gain.new(context: context)
  @input = @mid
  @output = self
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



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

def input
  @input
end

#mid ⇒ Object (readonly)

Returns the value of attribute mid.



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

def mid
  @mid
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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

def output
  @output
end

#side ⇒ Object (readonly)

Returns the value of attribute side.



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

def side
  @side
end

Instance Method Details

#render(num_frames, start_frame = 0, cache = {}) ⇒ Object 



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# File 'lib/deftones/component/mid_side_merge.rb', line 18

def render(num_frames, start_frame = 0, cache = {})
  cache_key = [object_id, start_frame, num_frames]
  return cache.fetch(cache_key).dup if cache.key?(cache_key)

  mid_buffer = @mid.render(num_frames, start_frame, cache)
  side_buffer = @side.render(num_frames, start_frame, cache)

  output_buffer = Array.new(num_frames) do |index|
    left = (mid_buffer[index] + side_buffer[index]) * SQRT_ONE_HALF
    right = (mid_buffer[index] - side_buffer[index]) * SQRT_ONE_HALF
    (left + right) * 0.5
  end

  cache[cache_key] = output_buffer
  output_buffer.dup
end

#render_block(num_frames, start_frame = 0, cache = {}) ⇒ Object 



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# File 'lib/deftones/component/mid_side_merge.rb', line 35

def render_block(num_frames, start_frame = 0, cache = {})
  cache_key = [object_id, :block, start_frame, num_frames]
  return cache.fetch(cache_key).dup if cache.key?(cache_key)

  mid_block = @mid.send(:render_block, num_frames, start_frame, cache)
  side_block = @side.send(:render_block, num_frames, start_frame, cache)
  mid = mid_block.mono
  side = side_block.mono
  output = Core::AudioBlock.from_channel_data([
    Array.new(num_frames) { |index| (mid[index] + side[index]) * SQRT_ONE_HALF },
    Array.new(num_frames) { |index| (mid[index] - side[index]) * SQRT_ONE_HALF }
  ])

  cache[cache_key] = output
  output.dup
end