p5.js | getLevel() Function

Last Updated : 17 Jan, 2020

The getLevel() function is an inbuilt function in p5.js library. This function is used to returns a single Amplitude reading at the moment it is called. For continuous readings, you can run in the draw loop.

Syntax:

getLevel(channel)

Note: All the sound-related functions only work when the sound library is included in the head section of the index.html file.

Parameter: This function accepts a single parameter as mentioned above and described below:

channel: This parameter is use to return channel that is Boolean value 0 means left and 1 means right, it is optional.

Below example illustrates the p5.getLevel() function in JavaScript:

function preload(){ 
  sound1 = loadSound('song.mp3'); 
  sound2 = loadSound('pfivesound.mp3'); 
} 
function setup(){ 
  amplitude = new p5.Amplitude(); 
  sound1.play(); 
  sound2.play(); 
  amplitude.setInput(sound2); 
} 
function draw() { 
  background(255); 
  fill(200); 
  let gfg = amplitude.getLevel(); 
  let size = map(gfg, 0, 1, 0, 400); 
  ellipse(width/1, height/1, size*2, size*2); 
} 
function mousePressed(){ 
  sound2.pause(); 
} 
   
function mouseReleased(){ 
  sound2.play(); 
} 