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<head>
  <title>MSE: data gap detection</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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<body>
<pre id="test">
<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

runWithMSE(async (ms, el) => {
  const threshold = 0.5; // gap threshold in seconds.
  const fuzz = 0.000001; // fuzz when comparing double.

  await once(ms, "sourceopen");
  ok(true, "Receive a sourceopen event");
  const videosb = ms.addSourceBuffer("video/mp4");
  const vchunks = [{start: 0, end: 3.203333}, { start: 3.203333, end: 6.406666}];

  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
  // We will insert a gap of threshold
  videosb.timestampOffset = threshold;
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
  // HTMLMediaElement fires 'waiting' if somebody invokes |play()| before the MDSM
  // has notified it of available data. Make sure that we get 'playing' before
  // we starting waiting for 'waiting'.
  info("Invoking play()");
  let p = once(el, "playing");
  el.play();
  await p;
  await once(el, "waiting");
  // We're waiting for data after the start of the last frame.
  // 0.033333 is the duration of the last frame.
  ok((el.currentTime >= vchunks[1].end - 0.033333 + threshold - fuzz &&
      el.currentTime <= vchunks[1].end + threshold + fuzz),
     `skipped the gap properly: ${el.currentTime} ${vchunks[1].end + threshold}`);
  is(el.buffered.length, 2, "buffered range has right length");
  // Now we test that seeking will succeed despite the gap.
  el.currentTime = el.buffered.end(0) + (threshold / 2);
  await once(el, "seeked");
  // Now we test that we don't pass the gap.
  // Clean up our sourcebuffer by removing all data.
  videosb.timestampOffset = 0;
  videosb.remove(0, Infinity);
  el.currentTime = 0;
  el.pause();
  await once(videosb, "updateend");
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 5), ".m4s");
  // We will insert a gap of threshold + 1ms
  videosb.timestampOffset = threshold + 1 / 1000;
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 9), ".m4s");
  info("Invoking play()");
  p = once(el, "playing");
  el.play();
  await p;
  await once(el, "waiting");
  // We're waiting for data after the start of the last frame.
  // 0.033333 is the duration of the last frame.
  ok((el.currentTime >= vchunks[0].end - 0.033333 - fuzz &&
      el.currentTime <= vchunks[0].end + fuzz),
     `stopped at the gap properly: ${el.currentTime} ${vchunks[0].end}`);
  SimpleTest.finish();
});

</script>
</pre>
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