<!DOCTYPE HTML>
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<head>
  <title>MSE: Check that playback only starts once we have data at time = 0</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) => {
  el.controls = true;
  el.addEventListener("loadeddata", () => {
    ok(el.buffered.length, "data is buffered");
    is(el.buffered.start(0), 0, "must fire loadeddata when data has been loaded");
    is(el.currentTime, 0, "must fire loadeddata at start");
  });
  el.addEventListener("playing", () => {
    ok(el.buffered.length, "data is buffered");
    is(el.buffered.start(0), 0, "must fire playing when data has been loaded");
    ok(el.currentTime >= 0, "must have started playback");
  });
  await once(ms, "sourceopen");
  ok(true, "Receive a sourceopen event");
  const videosb = ms.addSourceBuffer("video/mp4");
  is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
  let p = once(el, "loadedmetadata");
  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
  await p;
  videosb.appendWindowStart = 2;
  videosb.appendWindowEnd = 4;
  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
  // Load [2.4, 3.968344). 2.4 as it's the first keyframe after 2s and
  // 3.968344 as the last frame ends after 4s.
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
  is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
  // test that appendWindowEnd did its job.
  ok(el.buffered.start(0) >= 2, "no data can be found prior appendWindowStart");
  ok(el.buffered.end(el.buffered.length - 1) <= 4, "no data can be found beyond appendWindowEnd");
  el.play();
  await once(el, "play");
  videosb.appendWindowStart = 0;
  p = once(el, "playing");
  await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 8), ".m4s");
  await p;
  ok(true, "playing");
  SimpleTest.finish();
});

</script>
</pre>
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