How to replace audio input from mp3 to microphone

Processing Libraries
1

Hello everyone! I am new in Processing and I could use some help. I have this code that makes use of the Minim library and visualizes a given sound file:

import ddf.minim.*;
import ddf.minim.analysis.*;

Minim minim;
AudioPlayer player;
AudioMetaData meta;
BeatDetect beat;
int  r = 200;
float rad = 700;
void setup()
{
  size(500, 300);
  minim = new Minim(this);
  player = minim.loadFile("song.mp3");
  meta = player.getMetaData();
  beat = new BeatDetect();
  player.loop();
  background(-1);
  noCursor();
}

void draw()
{ 
  float t = map(mouseX, 0, width, 0, 1);
  beat.detect(player.mix);
  fill(#1A1F18, 20);
  noStroke();
  rect(0, 0, width, height);
  translate(width/2, height/2);
  noFill();
  fill(0, 10);
  if (beat.isOnset()) rad = rad*0.0001;
  else rad = 1.70;
  ellipse(0, 0, 0, 0);
  stroke(-1, 500);
  int bsize = player.bufferSize();
  for (int i = 0; i < bsize - 1; i+=500)
    beginShape();
  noFill();
  stroke(0, 50);
  for (int i = 0; i < bsize; i+=130)
  {
    float x2 = (r + player.left.get(i)*1000)*cos(i*2*PI/bsize);
    float y2 = (r + player.left.get(i)*1000)*sin(i*2*PI/bsize);
    vertex(x2/2, y2/2);
    pushStyle();
    stroke(-1);
    strokeWeight(2);
    point(x2, y2/2);
    popStyle();
  }
  endShape();
}

I would like to ask how can the code be changed so that the visualization will actually respond to the user’s microphone in real time (instead of the mp3 file). I found some examples that use the AudioInput In but I messed up (as I am not sure what to change).

Thank you in advance