Class: Synthesizer::Unison

Inherits:
Object
  • Object
show all
Defined in:
lib/synthesizer/unison.rb

Constant Summary collapse

UNI_NUM_MAX = 
16

Instance Method Summary collapse

Constructor Details

#initialize(note_perform, source, phase) ⇒ Unison

Returns a new instance of Unison.



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# File 'lib/synthesizer/unison.rb', line 5

def initialize(note_perform, source, phase)
  synth = note_perform.synth

  @note_perform = note_perform
  @source = source
  @source_contexts = UNI_NUM_MAX.times.map {|i|
    source.generate_context(synth.soundinfo, note_perform,  phase.value)
  }
end

Instance Method Details

#next(uni_num, uni_detune, uni_stereo, volume, pan, tune_semis, tune_cents, sym, sync) ⇒ Object 



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# File 'lib/synthesizer/unison.rb', line 15

def next(uni_num, uni_detune, uni_stereo, volume, pan, tune_semis, tune_cents, sym, sync)
  if uni_num<1.0
    uni_num = 1.0
  elsif UNI_NUM_MAX<uni_num
    uni_num = UNI_NUM_MAX
  end

  if uni_num==1.0
    context = @source_contexts[0]

    l_gain, r_gain = Utils.panning(pan)
    hz = @note_perform.note.hz(semis: tune_semis, cents: tune_cents)

    buffer = @source.next(context, AudioStream::Rate.freq(hz), sym, sync, l_gain, r_gain)
  else
    buffer = uni_num.ceil.times.map {|i|
      context = @source_contexts[i]

      uni_volume = 1.0
      if uni_num<i
        uni_volume = uni_num % 1.0
      end

      sign = i.even? ? 1 : -1
      diff = sign * (i + 1.0) / (uni_num + 1.0)

      detune_cents = uni_detune * diff * 100
      diff_pan = uni_stereo * diff

      l_gain, r_gain = Utils.panning(pan + diff_pan)
      hz = @note_perform.note.hz(semis: tune_semis, cents: tune_cents + detune_cents)

      @source.next(context, AudioStream::Rate.freq(hz), sym, sync, l_gain * uni_volume / uni_num, r_gain * uni_volume / uni_num)
    }.inject(:+)
  end

  AudioStream::Buffer.new(*buffer.streams.map {|stream|
    stream * volume
  })
end