test_MediaSource_memory_reporting.html

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<html>

<head>

  <title>MSE: memory reporting</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script type="text/javascript" src="mediasource.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<pre id="test">

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

runWithMSE(async (ms, v) => {

  // Load a webm video and play it.

  await once(ms, "sourceopen");

  const sb = ms.addSourceBuffer("video/webm");

  await fetchAndLoad(sb, "seek", [""], ".webm");

  const p = once(v, "ended");

  ms.endOfStream();

  v.play();

  await p;

  // Test that memory reporting works once we've played a video.

  // Grab a memory report.

  const mgr = SpecialPowers.Cc["@mozilla.org/memory-reporter-manager;1"]

      .getService(SpecialPowers.Ci.nsIMemoryReporterManager);

  let amount;

  const handleReport = (aProcess, aPath, aKind, aUnits, aAmount) => {

    if (aPath == "explicit/media/resources") {

      amount = (amount || 0) + aAmount;

};

  await new Promise(r => mgr.getReports(handleReport, null, r, null, /* anonymized = */ false));

  ok(true, "Yay didn't crash!");

  ok(amount !== undefined, "Got media resources amount");

  ok(amount > 0, "Non-zero amount reported for media resources");

  SimpleTest.finish();

});

</script>

</pre>

</body>

</html>