Quelle test_streams_firstframe.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/media/test/test_streams_firstframe.html

<!DOCTYPE HTML>
<html>
<head>
  <title>Test that a non-autoplaying, non-playing element with a MediaStream source triggers canplay and shows a first frame</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="manifest.js"></script>
  <script src="/tests/dom/canvas/test/captureStream_common.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">

async function runTest() {
  const canvas = document.createElement("canvas");
  canvas.getContext("2d");
  const helper = new CaptureStreamTestHelper2D(100, 100);

  const video = document.createElement("video");
  document.body.appendChild(video);

  video.srcObject = canvas.captureStream();
  helper.drawColor(canvas, helper.red);

  await Promise.race([
    new Promise(r => video.oncanplay = r),
    new Promise(r => setTimeout(r, 30000))
      .then(() => Promise.reject(new Error("Canplay timeout"))),
  ]);

  ok(true, "Got \"canplay\"");
  is(video.readyState, video.HAVE_ENOUGH_DATA, "Expected readyState");
  ok(helper.isPixel(helper.getPixel(video), helper.red),
    "First frame is rendered before playing");

  helper.drawColor(canvas, helper.green);
  await helper.pixelMustNotBecome(video, helper.green, {
    time: 1000,
    infoString: "Rendered first frame doesn't change on new frame from source"
  });
  ok(helper.isPixel(helper.getPixel(video), helper.red),
    "First frame is still rendered");

  video.play();
  helper.drawColor(canvas, helper.blue);
  await helper.pixelMustBecome(video, helper.blue, {
    infoString: "New frame gets rendered when playing"
  });

  video.srcObject.getTracks().forEach(t => t.stop());
}

(async function() {
  SimpleTest.waitForExplicitFinish();
  SimpleTest.requestFlakyTimeout("Explicit timeout reasons");
  try {
    await runTest();
  } catch(e) {
    ok(false, e);
  }
  SimpleTest.finish();
})();

</script>
</pre>
</body>
</html>

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