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# File 'lib/mml2wav/wave.rb', line 9
def write(sounds, options={})
output_path = options[:output] || "doremi.wav"
sampling_rate = options[:sampling_rate] || 22050
bpm = options[:bpm] || 120
velocity = 5
octave = 4
default_length = 4.0
format = Format.new(:mono, :pcm_8, sampling_rate)
Writer.new(output_path, format) do |writer|
buffer_format = Format.new(:mono, :float, sampling_rate)
sounds.scan(/T\d+|V\d+|L\d+|[A-G][#+-]?\d*\.?|O\d+|[><]|./i).each do |sound|
base_sec = 60.0 * 4
length = default_length
case sound
when /\AT(\d+)/i
bpm = $1.to_i
when /\AV(\d+)/i
velocity = $1.to_i
when /\AL(\d+)/i
default_length = $1.to_f
when /\A([A-G][#+-]?)(\d+)(\.)?/i
length = $2.to_f
sound = $1
length = default_length / 1.5 if $3
when /\AO(\d+)/i
octave = $1.to_i
when "<"
octave += 1
when ">"
octave -= 1
end
sec = base_sec / length / bpm
amplitude = velocity.to_f / 10
frequency = Scale::FREQUENCIES[sound.downcase]
next unless frequency
frequency *= (2 ** octave)
samples = sine_wave(frequency, sampling_rate, sec, amplitude)
buffer = Buffer.new(samples, buffer_format)
writer.write(buffer)
end
end
end
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