Class: RazyK::Audio::Player

Inherits:
Object
  • Object
show all
Defined in:
lib/razyk/audio/player.rb

Instance Method Summary collapse

Constructor Details

#initialize(tempo: 4) ⇒ Player

Returns a new instance of Player.



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# File 'lib/razyk/audio/player.rb', line 8

def initialize(tempo: 4)
  @tempo = tempo
  @dev = CoreAudio.default_output_device
  @buf = @dev.output_buffer(1024)
  @beat_samples = (@dev.nominal_rate / (@tempo * 4)).floor
  @beat_bufs = Hash.new { |h, k| h[k] = NArray.sint(@beat_samples * (k+1)) }
  @samples = 0
  @queue = Queue.new
  @thread = nil
end

Instance Method Details

#play(length, octave, note) ⇒ Object 



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# File 'lib/razyk/audio/player.rb', line 19

def play(length, octave, note)
  unless (0..8).include?(octave)
    octave = 4
  end
  unless (0..11).include?(note)
    note = 0
  end
  @queue.push([length, octave, note])
  if @thread.nil? or not(@thread.status)
    @thread = Thread.start{ run }
  end
end

#run ⇒ Object 



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# File 'lib/razyk/audio/player.rb', line 37

def run
  begin
    @buf.start
    while (tuple = @queue.pop)
      length, octave, note = tuple
      wav = @beat_bufs[length]
      if octave | note == 0
        wav.fill!(0)
      else
        freq = (440.0 * (2 ** (octave-4))) # An
        freq *= 2 ** ((note-9)/12.0)
        phase = Math::PI * 2 * freq / @dev.nominal_rate
        breath = (@beat_samples * 0.2).round
        eot = wav.size - breath
        eot.times do |j|
          wav[j] = (0.7 * Math.sin(phase*(@samples+j)) * 0x7FFF).round
        end
        breath.times do |j|
          wav[eot+j] = 0
        end
        @samples += wav.size
        @buf << wav
      end
    end
  rescue
    puts $!, $@
  ensure
    @buf.stop
  end
end

#stop ⇒ Object 



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# File 'lib/razyk/audio/player.rb', line 32

def stop
  @queue.push(nil)
  @thread.join if @thread
end