import krister.Ess.*;

AudioChannel myChannel;
FFT myFFT;
int bands = 256;  // Number of FFT frequency bands to calculate


void setup() {
  size(1024, 600);
  
  Ess.start(this);  // Start Ess
  // Load "girl2.aif" into a new AudioChannel, file must be in the "data" folder
  myChannel = new AudioChannel("girl2.aif");
  myChannel.play(Ess.FOREVER);
  myFFT = new FFT(bands *2);  // We want 256 frequency bands, so we pass in 512
}

void draw() {
  background(0);
  // Get spectrum
  myFFT.getSpectrum(myChannel);
  // Draw FFT data
  stroke(255);
  for (int i = 0; i < bands; i++) {
    float x = width - pow(1024, (255.0 -i) / bands);
    float maxY = max(0, myFFT.maxSpectrum[i] * height*2);
    float freY = max(0, myFFT.spectrum[i] * height*2);
    // Draw maximum lines
    stroke(30, 144, 255);
    line(x, height, x, height-maxY);
    // Draw frequency lines
    stroke(100);
    line(x, height, x, height-freY);
  }
}
public void stop() {
  Ess.stop();  // When program stops, stop Ess too
  super.stop();
}