soundEngine.js

//P5.js, P5Sound.js and P5.dom.js are required to use this code.
let level; //Amplitude level of the program, global variable
let waveform; //Frequency values of the song, global variable

//File input related functions :
let input; //Creates a single file input for our program
let sound; //The sound file

//List of possible frequencies that you can get from the song, range from 0-255
let bass;
let lowMid;
let mid;
let highMid;
let treble;

//Global Variables :
let amplitude;
let frequency;

//Boolean checks
let onOff = true; //On off switch for the program
let soundRecieved = false;
let isPlaying;

//This function takes play in the P5.js setup function
function setupSound()
{
  createCanvas(400,400);
  amplitude = new p5.Amplitude(); //Creates a new amplitude function in the p5.sound file
  frequency = new p5.FFT() //This one measures the frequency of the sound
  amplitude.setInput(sound) //Entering in the variable
  frequency.setInput(sound) //Entering in the variable into

  input = createFileInput(handleFile) //Handle File refers to a function, the createFileInput function is a p5js Dom function

    isPlaying = false;
}

function handleFile(file) //This function handles the audio transfer from the computer to the program and back to the computer. Note : the nature of this function means that it will take a few seconds for the sound file to become available to play through the mousePressed function
{
  if (file.type === 'audio')
    {
        console.log("File recieved")
        sound = loadSound(file.data)
        soundRecieved = true;
        console.log(file)
    }
  else
    {
        console.error("Incorrect file format, please use an audio format")  
    }
}

function drawSound()
{
  level = amplitude.getLevel() //gets the level of the amplitude real time, it's between 1 and 0
  spectrum = frequency.analyze() //This returns an array, this is required at all times

  //List of returned frequencies from p5.sound
  bass = frequency.getEnergy("bass")
  lowMid = frequency.getEnergy("lowMid")
  mid = frequency.getEnergy("mid")
  highMid = frequency.getEnergy("highMid")
  treble = frequency.getEnergy("treble")

  if(soundRecieved)
  {
    playMusic()
  }
}

function playMusic()
{
  let soundLoad = sound.isLoaded();
  if(soundLoad)
  {
    sound.play()
    soundRecieved = false; //This is to make sure
      isPlaying = true;
  }
}