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<head>
<title>A disabled video track is rendered as blackness</title>
<link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/>
<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#introduction">
<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreams-as-media-elements">
</head>
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<p class="instructions">When prompted, accept to share your video stream.</p>
<h1 class="instructions">Description</h1>
<p class="instructions">This test checks that a disabled video track in a
MediaStream is rendered as blackness.</p>
<video id="vid"></video>

<div id='log'></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
var vid = document.getElementById("vid");
var cv = document.createElement("canvas");
var t = async_test("Tests that a disabled video track in a MediaStream is rendered as blackness");
t.step(function() {
  navigator.mediaDevices.getUserMedia({video: true})
    .then(t.step_func(function (stream) {
      if (stream.getVideoTracks()[0].enabled) {
        stream.getVideoTracks()[0].enabled = false;
      }

      var testOnceLoadeddata = t.step_func(function() {
        vid.removeEventListener("loadeddata", testOnceLoadeddata, false);
        cv.width = vid.offsetWidth;
        cv.height = vid.offsetHeight;
        var ctx = cv.getContext("2d");
        ctx.drawImage(vid,0,0);
        var imageData = ctx.getImageData(0, 0, cv.width, cv.height);
        for (var i = 0; i < imageData.data.length; i+=4) {
          assert_equals(imageData.data[i], 0, "No red component in pixel #" + i);
          assert_equals(imageData.data[i + 1], 0, "No green component in pixel #" + i);
          assert_equals(imageData.data[i + 2], 0, "No blue component in pixel #" + i);
          assert_equals(imageData.data[i + 3], 255, "No transparency in pixel #" + i);
        }
        t.done();
      });

      vid.srcObject = stream;
      vid.play();
      vid.addEventListener("loadeddata", testOnceLoadeddata, false);
    }));
});
</script>
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