class AudioStream::Fx::Tremolo
Public Class Methods
new(soundinfo, freq:, depth:)
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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
Public Instance Methods
process(input)
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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