----- Sound Mini Series by Patt Vira ----- 

Name: EP5_p5.FFT - Class Demo 

Video Tutorial: https://youtu.be/8O5aCwdopLo

​

Connect with Patt: @pattvira

https://www.pattvira.com/

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*/

​

let song; 

let fft; 

let waveform = []; let smoothing = 0.8; let bins = 512; 

let spectrum = []; let r = 100;

​

function preload() {

  song = loadSound("Veiil.mp3");

}

​

function setup() {

  createCanvas(bins, 400);

  song.play();

  fft = new p5.FFT(smoothing, bins);

}

​

function draw() {

  background(220);

  waveform = fft.waveform();

  spectrum = fft.analyze();

  let vol = fft.getEnergy(20, 140);

  stroke(255);

  line(0, height/2, width, height/2);

  if (vol > 250) {

    stroke(255, 0, 0);

  } else {

    stroke(0);

  }

  // Frequency Domain

  for (let i=0; i<spectrum.length; i++) {

    let y = map(spectrum[i], 0, 255, 0, height/2);

    line(i, height, i, height - y);

  }

  //Time Domain

  for (let i=0; i<waveform.length; i++) {

    let y = height/4 + map(waveform[i], -1, 1, -r, r);

    ellipse(i, y, 1, 1);

  }

​

}