amenizer

amenizer.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

file = Tempfile.new(%w/amen .wav/)
file.write(open('http://dl.dropbox.com/u/334064/amen_lq.wav').read)

amens = Scissor(file.path) / 4
target = Scissor(infile)
result = Scissor.silence(target.duration)

target.bars.each do |bar|
  amen = amens[rand(amens.size)]
  new_bar = amen.stretch((bar.duration / amen.duration) * 100)
  result = result.replace(bar.start - 0.05, bar.duration, new_bar)
end

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