Class: Deftones::Instrument::MembraneSynth

Inherits:
Core::Instrument show all
Defined in:
lib/deftones/instrument/membrane_synth.rb

Instance Attribute Summary collapse

Attributes inherited from Core::Instrument

#mute, #output, #volume

Attributes inherited from Core::AudioNode

#context, #input

Instance Method Summary collapse

Methods inherited from Core::Instrument

#apply_volume!, #dispose, #get, #input, #mute?, #releaseAll, #release_all, #render, #render_block, #set, #triggerAttack, #triggerAttackRelease, #triggerRelease

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, #multichannel_process?, #name, #normalize_connection_index, #normalize_output_block, #now, #number_of_inputs, #number_of_outputs, #output, #output_for_connection, #output_for_index, #outputs, #process, #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(pitch_decay: 0.05, octaves: 4.0, attack: 0.001, decay: 0.2, sustain: 0.0, release: 0.15, context: Deftones.context, &block) ⇒ MembraneSynth

Returns a new instance of MembraneSynth.



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# File 'lib/deftones/instrument/membrane_synth.rb', line 8

def initialize(pitch_decay: 0.05, octaves: 4.0, attack: 0.001, decay: 0.2,
               sustain: 0.0, release: 0.15, context: Deftones.context, &block)
  super(context: context)
  @pitch_decay = pitch_decay.to_f
  @octaves = octaves.to_f
  @oscillator = Source::Oscillator.new(type: :sine, context: context)
  @envelope = Component::AmplitudeEnvelope.new(
    attack: attack,
    decay: decay,
    sustain: sustain,
    release: release,
    context: context
  )
  @oscillator.start(0.0)
  @oscillator >> @envelope >> @output
  block&.call(self)
end

Instance Attribute Details

#envelope ⇒ Object (readonly)

Returns the value of attribute envelope.



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# File 'lib/deftones/instrument/membrane_synth.rb', line 6

def envelope
  @envelope
end

#oscillator ⇒ Object (readonly)

Returns the value of attribute oscillator.



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# File 'lib/deftones/instrument/membrane_synth.rb', line 6

def oscillator
  @oscillator
end

Instance Method Details

#play(note, duration: "8n", at: nil, velocity: 1.0) ⇒ Object 



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# File 'lib/deftones/instrument/membrane_synth.rb', line 26

def play(note, duration: "8n", at: nil, velocity: 1.0)
  trigger_attack_release(note, duration, at, velocity)
end

#resolve_time(time) ⇒ Object (private) 



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# File 'lib/deftones/instrument/membrane_synth.rb', line 53

def resolve_time(time)
  return context.current_time if time.nil?

  Deftones::Music::Time.parse(time)
end

#trigger_attack(note, time = nil, velocity = 1.0) ⇒ Object 



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# File 'lib/deftones/instrument/membrane_synth.rb', line 30

def trigger_attack(note, time = nil, velocity = 1.0)
  scheduled_time = resolve_time(time)
  base_frequency = Deftones::Music::Note.to_frequency(note)
  @oscillator.frequency.set_value_at_time(base_frequency * (2.0**@octaves), scheduled_time)
  @oscillator.frequency.exponential_ramp_to(base_frequency, @pitch_decay)
  @envelope.trigger_attack(scheduled_time, velocity)
  self
end

#trigger_attack_release(note, duration, time = nil, velocity = 1.0) ⇒ Object 



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# File 'lib/deftones/instrument/membrane_synth.rb', line 44

def trigger_attack_release(note, duration, time = nil, velocity = 1.0)
  scheduled_time = resolve_time(time)
  trigger_attack(note, scheduled_time, velocity)
  trigger_release(scheduled_time + Deftones::Music::Time.parse(duration))
  self
end

#trigger_release(time = nil) ⇒ Object 



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# File 'lib/deftones/instrument/membrane_synth.rb', line 39

def trigger_release(time = nil)
  @envelope.trigger_release(resolve_time(time))
  self
end