test_InputBufferIsCleared.html

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<head>

  <title>MSE: input buffer is cleared as expected (bug 1697476)</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" />

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<pre id="test">

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

SimpleTest.waitForExplicitFinish();

// Test bug 1697476 is fixed. We do this by appending a number of segments with

// trailing `skip` boxes. If the bug is fixed, then the data from these appends

// will eventually be cleared from memory. If not fixed, we leak that memory.

runWithMSE(async (ms, v) => {

  await once(ms, "sourceopen");

  const sb = ms.addSourceBuffer("video/mp4");

  await fetchAndLoad(sb, "bipbop/bipbop_video", ["init"], ".mp4");

  // Load ~1mb of media.

  await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");

  // Load ~1mb more media several more times.

  const numberOfAppends = 5;

  for (let i = 1; i < numberOfAppends; ++i) {

    sb.timestampOffset = v.buffered.end(0);

    await fetchAndLoad(sb, "bipbop/bipbop_trailing_skip_box_video", ["1"], ".m4s");

  // Grab a memory report. We'll use this to make sure we're not accumulating

  // too much data in our buffers.

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

      .getService(SpecialPowers.Ci.nsIMemoryReporterManager);

  let amount = 0;

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

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

      amount += 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");

  const sgementSize = 1023860;

  // Set the limit to be equal to the total data we appended. If we're not

  // clearing buffers, we'll have all the data from the appends + some other

  // data, so will fail.

  const limit = sgementSize * numberOfAppends - 1;

  ok(amount < limit, `Should have less than ${limit} bytes of media usage. Got ${amount} bytes.`);

  SimpleTest.finish();

});

</script>

</pre>

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