Class: AudioStream::Fx::Tremolo

Inherits:
Object
  • Object
show all
Defined in:
lib/audio_stream/fx/tremolo.rb

Instance Method Summary collapse

Constructor Details

#initialize(soundinfo, freq:, depth:) ⇒ Tremolo

Returns a new instance of Tremolo.



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# File 'lib/audio_stream/fx/tremolo.rb', line 4

def initialize(soundinfo, freq:, depth:)
  @samplerate = soundinfo.samplerate
  @freq = freq.to_f
  @depth = depth.to_f
  @phase = 0
end

Instance Method Details

#process(input) ⇒ Object 



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# File 'lib/audio_stream/fx/tremolo.rb', line 11

def process(input)
  window_size = input.window_size
  period = 2 * Math::PI * @freq / @samplerate

  streams = input.streams.map {|stream|
    stream.map.with_index {|f, i|
      f * (1.0 + @depth * Math.sin((i + @phase) * period))
    }
  }
  @phase = (@phase + window_size) % (window_size / period)

  Buffer.new(*streams)
end