mp3 player with fouriertransformation

mp3fourier.java

import ddf.minim.*;
import ddf.minim.signals.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;

boolean isPlaying = false;

String filename;
AudioOutput out;
AudioPlayer song;
Minim minim;
FFT fft;

void setup()
{
  size(500, 300);

  // init minim and sound playback
  minim = new Minim(this);
  //filename = getFile().getName();
  filename = "sample.mp3";
  song = minim.loadFile(filename);
  out = minim.getLineOut(Minim.STEREO, 2048);

  // fourier transformation
  fft = new FFT(song.bufferSize(), song.sampleRate());
}

void draw()
{
  background(0);

  // show trackname
  stroke(255, 255, 255);
  text("Playing: " + filename, 5, 20);

  // draw amplitude
  stroke(0, 255, 0);
  for (int i = 0; i < song.bufferSize() - 2; i++)
  {
    line(i, 50-song.left.get(i)*90, i+1, 50- song.left.get(i+1)*90);
    line(i, 150-song.right.get(i)*90, i+1, 150- song.right.get(i+1)*90);
  }

  // draw the foureir analysis
  stroke(0, 0, 255);
  fft.forward(song.mix);
  for (int i = 0; i < fft.specSize(); i++)
  {
    line(i, height, i, height - fft.getBand(i)*4);
  }
}

void mousePressed()
{
  if (isPlaying)
  {
    song.pause();
    fft.window(FFT.NONE);
    isPlaying = false;
  }
  else
  {
    song.play();
    fft.window(FFT.HAMMING);
    isPlaying = true;
  }
}

void stop()
{
  minim.stop();
  super.stop();
}