class AudioStream::Fx::Chorus
Public Class Methods
new(soundinfo, depth: 100, rate: 0.25)
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# File lib/audio_stream/fx/chorus.rb, line 4 def initialize(soundinfo, depth: 100, rate: 0.25) @soundinfo = soundinfo @depth = depth @rate = rate @delaybufs = [ RingBuffer.new(@depth * 3, 0.0), RingBuffer.new(@depth * 3, 0.0) ] @phase = 0 @speed = (2.0 * Math::PI * @rate) / @soundinfo.samplerate end
Public Instance Methods
lerp(start, stop, step)
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# File lib/audio_stream/fx/chorus.rb, line 46 def lerp(start, stop, step) (stop * step) + (start * (1.0 - step)) end
process(input)
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# File lib/audio_stream/fx/chorus.rb, line 19 def process(input) window_size = input.window_size channels = input.channels streams = channels.times.map {|ch| delaybuf = @delaybufs[ch] input.streams[ch].map.with_index {|f, i| tau = @depth * (Math.sin(@speed * (@phase + i)) + 1) t = i - tau m = t.floor delta = t - m wet = delta * delaybuf[i-m+1] + (1.0 - delta) * delaybuf[i-m] f = (f + wet) * 0.5 delaybuf.current = f delaybuf.rotate f } } @phase = (@phase + window_size) % (window_size / @speed) Buffer.new(*streams) end