test_Threshold_mp4.html

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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" />

</head>

<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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</html>