Class: PicoTune::Tune

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, sequence, phrases) ⇒ Tune

Returns a new instance of Tune.



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# File 'lib/picotune.rb', line 148

def initialize name, sequence, phrases
  @name = name
  @sequence = sequence
  @phrases = phrases

  @phrases.each do |p|
    p.tune = self
  end
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/picotune.rb', line 146

def name
  @name
end

#phrases ⇒ Object (readonly)

Returns the value of attribute phrases.



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# File 'lib/picotune.rb', line 146

def phrases
  @phrases
end

#sequence ⇒ Object (readonly)

Returns the value of attribute sequence.



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# File 'lib/picotune.rb', line 146

def sequence
  @sequence
end

Instance Method Details

#buffer ⇒ Object 



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# File 'lib/picotune.rb', line 170

def buffer
  @buffer ||= begin
    tune_buffer_length = @sequence.reduce(0) do |acc, phrase_name|
      acc + @phrases.find { |p| p.name == phrase_name }.buffer_size
    end

    offset = 0
    samples = Array.new(tune_buffer_length) { PicoTune::Sample.new }

    @sequence.each do |phrase_name|
      phrase = @phrases.find { |p| p.name == phrase_name }

      phrase.buffer.each_with_index do |phrase_sample, index|
        tune_sample = samples[offset + index] || PicoTune::Sample.new
        tune_sample.add phrase_sample
        samples[offset + index] = tune_sample
      end

      offset += phrase.buffer_size
    end

    samples
  end
end

#volume_factor_for_simultaneous_melodies ⇒ Object 



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# File 'lib/picotune.rb', line 158

def volume_factor_for_simultaneous_melodies
  max_melodies_in_phrases = 0

  @phrases.each do |phrase|
    if phrase.simultaneous_melodies > max_melodies_in_phrases
      max_melodies_in_phrases = phrase.simultaneous_melodies
    end
  end

  1.0 / max_melodies_in_phrases if max_melodies_in_phrases > 0
end

#wav ⇒ Object 



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# File 'lib/picotune.rb', line 195

def wav
  @wav ||= begin
    wav_format = WaveFile::Format.new :stereo, :float, PicoTune::SAMPLE_RATE
    wav_buffer = WaveFile::Buffer.new buffer.map(&:to_a), wav_format
    name = "#{@name}.wav"

    WaveFile::Writer.new(name, WaveFile::Format.new(:stereo, :pcm_8, PicoTune::SAMPLE_RATE)) do |writer|
      writer.write(wav_buffer)
    end

    name
  end
end