Jacksonkr Jacksonkr - 7 months ago 95
Javascript Question

(Web Audio API) Oscillator node error: cannot call start more than once

When I start my oscillator, stop it, and then start it again; I get the following error:

Uncaught InvalidStateError: Failed to execute 'start' on 'OscillatorNode': cannot call start more than once.

Obviously I could use
to "stop" the audio but that strikes me as poor practice. What's a more efficient way of stopping the oscillator while being able to start it again?

code (jsfiddle)

var ctx = new AudioContext();
var osc = ctx.createOscillator();

osc.frequency.value = 8000;


function startOsc(bool) {
if(bool === undefined) bool = true;

if(bool === true) {
} else {

$(document).ready(function() {
$("#start").click(function() {
$("#stop").click(function() {

Current solution (at time of question): http://jsfiddle.net/xbqbzgt2/2/

Final solution: http://jsfiddle.net/xbqbzgt2/3/


The best solution I've found so far is to keep the SAME audioContext while recreating the oscillator every time you need to use it.


FYI You can only create 6 audioContext objects per browser page lifespan (or at least per my hardware):

Uncaught NotSupportedError: Failed to construct 'AudioContext': The number of hardware contexts provided (6) is greater than or equal to the maximum bound (6).