Bug 175412 – WebAudio does not output sound on iOS without user gesture

• Component: Web Audio
• Status: RESOLVED WONTFIX

[Andrew Morris]

No sound resulting from this code, also no error is thrown:

https://output.jsbin.com/mogudag

'use strict';

const handleError = (e) => {
  const pre = document.createElement('pre');
  pre.style.color = 'red';
  pre.textContent = `Error: ${e}\n.message: ${e.message}\n.stack: ${e.stack}`;
  document.body.appendChild(pre);
};

window.addEventListener('error', ({ error }) => handleError(error));
window.addEventListener('unhandledrejection', ({ reason }) => handleError(reason));

(async () => {
  try {
    await new Promise(resolve => window.addEventListener('load', resolve));
  
    const ctx = new (window.webkitAudioContext || window.AudioContext)();

    const oscNode = ctx.createOscillator();

    oscNode.connect(ctx.destination);
    oscNode.start();
  } catch (e) {
    handleError(e);
  }
})();

[Andrew Morris]

Tested on iPhone with iOS beta 4 and iPad with iOS beta 5.

[Radar WebKit Bug Importer]

<rdar://problem/33818985>

[Alexey Proskuryakov]

Does this start to work for you if triggered from a user interaction (tap?).

[youenn fablet]

For instance, https://output.jsbin.com/yuhobukuji

[Andrew Morris]

Ah it does work with user interaction. Didn't think that kind of restriction applied for web audio. Thanks.