wv.rb

class Waver
  def initialize(filename)
    @filename = File.expand_path(filename)
    @byte_order = []
    @size = File.size @filename
    
    open(@filename).each_byte{|ch|
      @byte_order << ch
    }
  end
  
  def create(output)
    @output = File.expand_path(output)
    open(@output,"w") do |f|
      f.print put_header
      @byte_order.reverse.each do |ch|
        f.print ch.chr
      end
    end
  end
  
  private
  def put_header
    return ["RIFF",36+@size,"WAVE","fmt ",16,1,2,44100,44100*2*16/8,2*16/8,16,"data",@size].pack("a4Va4a4Vv2V2v2a4V")
  end
end

if $0 == __FILE__
  wave = Waver.new(ARGV[0])
  wave.create("out.wav")
end