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The Tor Browser
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test_autoplay_policy_web_audio_notResumePageInvokedSuspendedAudioContext.html (2833B)

      1 <!DOCTYPE HTML>
      2 <html>
      3 <head>
      4  <title>Autoplay policy test : do not resume AudioContext which is suspended by page</title>
      5  <script src="/tests/SimpleTest/SimpleTest.js"></script>
      6  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
      7  <script type="text/javascript" src="manifest.js"></script>
      8 </head>
      9 <body>
     10 <script>
     11 /* import-globals-from ../../../test/manifest.js */
     12 /**
     13 * This test is used to ensure we won't resume AudioContext which is suspended
     14 * by page (it means calling suspend() explicitly) when calling
     15 * `AudioScheduledSourceNode.start()`.
     16 */
     17 
     18 SimpleTest.waitForExplicitFinish();
     19 
     20 (async function testNotResumeUserInvokedSuspendedAudioContext() {
     21  await setupTestPreferences();
     22 
     23  const nodeTypes = ["AudioBufferSourceNode", "ConstantSourceNode", "OscillatorNode"];
     24  for (let nodeType of nodeTypes) {
     25    info(`- create an audio context which should not be allowed to start, it's allowed to be created, but it's forbidden to start -`);
     26    await createAudioContext();
     27 
     28    info(`- explicitly suspend the AudioContext in the page -`);
     29    suspendAudioContext();
     30 
     31    info(`- start an 'AudioScheduledSourceNode', and check that the AudioContext does not start, because it has been explicitly suspended -`);
     32    await createAndStartAudioScheduledSourceNode(nodeType);
     33  }
     34 
     35  SimpleTest.finish();
     36 })();
     37 
     38 /**
     39 * Test utility functions
     40 */
     41 
     42 function setupTestPreferences() {
     43  return SpecialPowers.pushPrefEnv({"set": [
     44    ["media.autoplay.default", SpecialPowers.Ci.nsIAutoplay.BLOCKED],
     45    ["media.autoplay.blocking_policy", 0],
     46    ["media.autoplay.block-event.enabled", true],
     47  ]});
     48 }
     49 
     50 async function createAudioContext() {
     51  /* global ac */
     52  window.ac = new AudioContext();
     53  await once(ac, "blocked");
     54  is(ac.state, "suspended", `AudioContext is blocked.`);
     55 }
     56 
     57 function suspendAudioContext() {
     58  try {
     59    ac.suspend();
     60  } catch(e) {
     61    ok(false, `AudioContext suspend failed!`);
     62  }
     63 }
     64 
     65 async function createAndStartAudioScheduledSourceNode(nodeType) {
     66  let node;
     67  info(`- create ${nodeType} -`);
     68  switch (nodeType) {
     69    case "AudioBufferSourceNode":
     70      node = ac.createBufferSource();
     71      break;
     72    case "ConstantSourceNode":
     73      node = ac.createConstantSource();
     74      break;
     75    case "OscillatorNode":
     76      node = ac.createOscillator();
     77      break;
     78    default:
     79      ok(false, "undefined AudioScheduledSourceNode type");
     80      return;
     81  }
     82  node.connect(ac.destination);
     83 
     84  // activate the document in order to allow autoplay.
     85  SpecialPowers.wrap(document).notifyUserGestureActivation();
     86  node.start();
     87 
     88  await once(ac, "blocked");
     89  is(ac.state, "suspended", `AudioContext should not be resumed.`);
     90 
     91  // reset the activation flag of the document in order not to interfere next test.
     92  SpecialPowers.wrap(document).clearUserGestureActivation();
     93 }
     94 
     95 </script>