test_streams_individual_pause.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Test for bug 1073406. Pausing a video element should not pause another playing the same stream.</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

  <script type="text/javascript" src="manifest.js"></script>

  <script type="text/javascript" src="gUM_support.js"></script>

</head>

<body>

<video id="video1" autoplay></video>

<video id="video2" autoplay></video>

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

function getVideoImagePixelData(v) {

  const canvas = document.createElement("canvas");

  const ctx = canvas.getContext("2d");

  ctx.drawImage(v, 0, 0);

  const imgData = ctx.getImageData(canvas.width/2, canvas.height/2, 1, 1).data;

  return "r" + imgData[0] +

         "g" + imgData[1] +

         "b" + imgData[2] +

         "a" + imgData[3];

async function startTest() {

  // This test expects fake devices so that the video color will change

  // over time, explicitly request fakes.

  await pushGetUserMediaTestPrefs({fakeAudio: true, fakeVideo: true});

  const stream = await navigator.mediaDevices.getUserMedia({video: true});

  const video1 = document.getElementById('video1');

  const video2 = document.getElementById('video2');

  video1.srcObject = stream;

  video2.srcObject = stream;

  await new Promise(r => video1.onplaying = r);

  video1.pause();

  await new Promise(r => video1.onpause = r);

  const v1PausedImageData = getVideoImagePixelData(video1);

  const v2PausedImageData = getVideoImagePixelData(video2);

  while (getVideoImagePixelData(video2) == v2PausedImageData) {

    info("video2 has not progressed. Waiting.");

    await new Promise(r => video2.ontimeupdate = r);

  // Wait for a while to be sure video1 would have gotten a frame

  // if it is playing.

  for (let i = 3; i != 0; i--) {

    await new Promise(r => video2.ontimeupdate = r);

  info("video2 progressed OK");

  isnot(video1.currentTime, video2.currentTime,

        "v1 and v2 should not be at the same currentTime");

  is(getVideoImagePixelData(video1), v1PausedImageData,

     "video1 video frame should not have updated since video1 paused");

  for (const t of stream.getTracks()) {

    t.stop();

SimpleTest.waitForExplicitFinish();

(async function() {

  try {

    await startTest();

  } catch(error) {

    ok(false, "getUserMedia should not fail, got " + error.name);

  } finally {

    SimpleTest.finish();

})();

</script>

</body>

</html>