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Delayed AudioElement .play() when 'antialias = true' #288

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kevin-quaver opened this issue Oct 11, 2017 · 0 comments
Open

Delayed AudioElement .play() when 'antialias = true' #288

kevin-quaver opened this issue Oct 11, 2017 · 0 comments

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@kevin-quaver
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I have an html button, which I've added to the stage. When I click it to create and play an AudioElement, it works on most devices and systems without a hitch. However, I've noticed on certain iPads, the .play() is delayed significantly (sometimes up to 20 seconds before the audio starts playing). I've narrowed the culprit down to the stage option antialias = true.

The device in question is iPad model MD512LL/A, running v10.3.2.
Removing antialias = true fixes this issue.

Can you think of any reason why this option would affect audio playback on these devices?

Here's the code; I tried to simplify it as much as possible.

index.html

<html>
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
      html, body {
        margin:0;
        padding:0;
        width:100%;
        height:100%;
        overflow:hidden;
      }
    </style>
    <script defer src="main.dart" type="application/dart"></script>
    <script defer src="packages/browser/dart.js"></script>
  </head>

  <body>
      <div id="holder"></div>
  </body>
</html>

main.dart

import 'dart:html' as html;
import 'package:stagexl/stagexl.dart';
import 'dart:async';

html.AudioElement _audio;
StreamSubscription _audioSubscription;

void main() {

  StageOptions options = new StageOptions()
    ..stageAlign = StageAlign.TOP
    ..stageScaleMode = StageScaleMode.SHOW_ALL
    ..inputEventMode = InputEventMode.MouseAndTouch
    ..renderEngine = RenderEngine.WebGL
    ..transparent = true
    ..antialias = true
    ..backgroundColor = Color.Transparent;

  html.CanvasElement canvas = new html.CanvasElement()
    ..style.position = "absolute"
    ..style.width = "100%"
    ..style.height = "100%"
    ..style.margin = "0"
    ..style.padding = "0"
    ..style.overflow = "hidden";

  html.querySelector("body").children.insert(0, canvas);

  Stage stage = new Stage(canvas, width: 500, height: 500, options: options);

  new RenderLoop()..addStage(stage);

  new HtmlObject(html.querySelector("#holder"))..addTo(stage);

  html.ButtonElement playBtn = new html.ButtonElement()
    ..text = "PLAY"
    ..onClick.listen(_handlePlayClicked);

  html.document.querySelector("#holder").children.add(playBtn);
}

void _handlePlayClicked(html.Event event)
{
  html.ButtonElement btn = event.target as html.ButtonElement;
  _audioSubscription?.cancel();
  _audio?.pause();
  if (btn.text == "PLAY")
  {
    _audio = null;

    _audio = new html.AudioElement("http://www.noiseaddicts.com/samples_1w72b820/55.mp3");
    _audioSubscription = _audio.onEnded.listen((_){
      btn.text = "PLAY";
    });
    _audio.play();

    btn.text = "STOP";
  }
  else btn.text = "PLAY";
}
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@kevin-quaver