Sniff network for iTunes Store updateNowPlaying requests via ngrep. Expand to do interesting things based on what you're playing.

nowplaying-store.rb

require 'cgi'

match = 'track.updateNowPlaying'

ngrep_command = "ngrep -W byline '#{match}'"

puts "Watching network for iTunes Store now playing previews..."

IO.popen(ngrep_command).each do |line|
  if line.match(/\=#{match}/)
  	nowplaying = CGI::parse(line)

	puts
  	puts "Artist: #{nowplaying["artist"][0]}"
  	puts "Album: #{nowplaying["album"][0]}"
  	puts "Title: #{nowplaying["track"][0]}"
  end
end