A bookmarklet that lets you play DDR on Bandcamp
Go here for instructions and to get the bookmarket.
The game pretty much hijacks Bandcamp's page. Once you click the bookmarklet, it waits for music to start playing. After the music is played, the game takes control of that audio element. It makes a second, silent copy that is used to generate the arrows. The arrows are generated by doing beat detection on the silent copy. Although The beat detection algorithm is really naive and needs work.
###The Bookmarklet
When you click on the bookmarklet, this code is executed:
(function () {
if (window.bandCampRevolution) {
bandCampRevolution(1);
} else {
var cachebuster = Math.round(new Date().getTime() / 1);
var jsCode = document.createElement('script');
jsCode.setAttribute('src', '//rawgit.com/docmarionum1/BandcampRevolution/master/bcr.js?cb=' + cachebuster);
document.body.appendChild(jsCode);
jsCode.onload = function() {bandCampRevolution(1);};
}
}());
bandCampRevolution is a function that takes a single parameter from 0 to 3 representing the difficulty. 1 is normal.