test_getUserMedia_bug1223696.html

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<!DOCTYPE HTML>

<html>

<head>

  <script type="application/javascript" src="mediaStreamPlayback.js"></script>

  <script type="application/javascript" src="/tests/dom/canvas/test/captureStream_common.js"></script>

</head>

<body>

<pre id="test">

<script type="application/javascript">

  "use strict";

  createHTML({

    title: "Testing that removeTrack+addTrack of video tracks still render the correct track in a media element",

    bug: "1223696",

    visible: true

});

  runTest(async function() {

    const stream = await getUserMedia({audio:true, video: true});

    info("Test addTrack()ing a video track to an audio-only gUM stream");

    const video = createMediaElement("video", "test_video_track");

    video.srcObject = stream;

    video.play();

    await haveEvent(video, "loadeddata", wait(5000, new Error("Timeout")));

    info("loadeddata");

    const removedTrack = stream.getVideoTracks()[0];

    stream.removeTrack(removedTrack);

    const h = new CaptureStreamTestHelper2D();

    const emitter = new VideoFrameEmitter(h.grey, h.grey);

    emitter.start();

    stream.addTrack(emitter.stream().getVideoTracks()[0]);

    checkMediaStreamContains(stream, [stream.getAudioTracks()[0],

                                      emitter.stream().getVideoTracks()[0]]);

    await h.pixelMustBecome(video, h.grey, {

      threshold: 5,

      infoString: "The canvas track should be rendered by the media element",

});

    emitter.stop();

    for (const t of [removedTrack, ...stream.getAudioTracks()]) {

      t.stop();

});

</script>

</pre>

</body>

</html>