909 乗っけるやつ

4otf.rb

%w!ubygems scissor/echonest pit open-uri tempfile!.each {|g| require g }

Scissor.logger.level = Logger::DEBUG
Scissor.echonest_api_key = Pit.get('echonest.com', :require => {
    'api_key' => 'your Echo Nest API key'
  })['api_key']

infile, outfile = ARGV

bd = Scissor('http://dl.dropbox.com/u/334064/909BD.wav')
target = Scissor(infile)
result = Scissor.silence(target.duration)

target.beats.each do |beat|
  x = nil

  if bd.duration > beat.duration
    x = bd + Scissor.silence(beat.duration - bd.duration)
  else
    x = bd[0, beat.duration]
  end

  result = result.replace(beat.start, beat.duration, x)
end

Scissor.mix([target, result], outfile, :overwrite => true)