Return file object onComplete

[iforwms]

Is it possible to modify the onComplete function to accept a third argument and return the file object or make it available?

At the moment I'm not sure how I can relate the generated waveform with the file it was created for.

for (var i = 0; i < tracks.files.length; i++) {

    var track = tracks.files[i];
    track.id = i;

    // Generate waveforms
    SoundCloudWaveform.generate(track, {

      onComplete: function(png, pixels) {

        var id = track.id; // Returns the final value of i, not the current iteration

        var canvas = document.createElement('canvas');
        canvas.setAttribute('id', 'canvas' + id);
        document.getElementById('track' + id).appendChild(canvas);
        canvas.setAttribute('class', 'waveform');
        var context = canvas.getContext('2d');

        context.putImageData(pixels, 0, 0);

      }
   }
}