[Webkit-unassigned] [Bug 190410] New: user gesture after few seconds leads to audio context resuming but no sound

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190410

            Bug ID: 190410
           Summary: user gesture after few seconds leads to audio context
                    resuming but no sound
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shortsands.ceo at gmail.com

On Safari 12, I am trying everything I can to get audio to have sound.  It was working on Safari 11, but not on Safari 12.
In the app, calling resume() on the audioContext after a user interaction gets the audio context out of suspended and into running in all cases.  So I am assuming that it is "allowed to start" per Web Audio API.
However, if user interaction is within ~5 seconds of loading the page, sound comes out.  If after 5 seconds, no sound.
Thanks.

    function fixAudioContext() {

      console.log("1: " + audioContext.state);

      return audioContext.resume().then(function() {

        console.log("2: " + audioContext.state);

        var buffer = audioContext.createBuffer(1, 1, 22050);
        var source = audioContext.createBufferSource();
        source.buffer = buffer;
        // Connect to output (speakers)
        source.connect(audioContext.destination);
        // Play sound
        if (source.start) {
          source.start(0);
        } else if (source.play) {
          source.play(0);
        } else if (source.noteOn) {
          source.noteOn(0);
        }

        console.log("3: " + audioContext.state);

        audioContextDeferred.resolve(audioContext.state);
      })
      .catch(function() {
      });
    }

After 5 seconds console still prints, "1: suspended, 2: running, 3: running" but no sound.  The creating buffer stuff is an attempt to play a silent sound to warm up the context.  Honestly just a shot in the dark.

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