test_video_stats_resistfingerprinting.html

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Mozilla Bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1369309

Tor Ticket:

https://trac.torproject.org/projects/tor/ticket/15757

-->

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  <meta charset="utf-8">

  <title>Test for Bug 1369309</title>

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

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

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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=682299">Mozilla Bug 1369309</a>

<a target="_blank" href="https://trac.torproject.org/projects/tor/ticket/15757">Tor Ticket 15757</a>

<!-- The main testing script -->

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

  var manager = new MediaTestManager;

  const SPOOFED_FRAMES_PER_SECOND = 30;

  const SPOOFED_DROPPED_RATIO = 0.05;

  const MS_PER_TIME_ATOM = 100; // Not the default anymore, but what we test here.

  // Push the setting of 'privacy.resistFingerprinting' into gTestPrefs, which

  // will be set during MediaTestManager.runTests().

  gTestPrefs.push(

    ["privacy.resistFingerprinting", true],

    ["privacy.resistFingerprinting.reduceTimerPrecision.microseconds", MS_PER_TIME_ATOM * 1000],

    ["privacy.resistFingerprinting.reduceTimerPrecision.jitter", false],

    // We use 240p as the target resolution since 480p is greater than every video

    // source in our test suite, so we need to use 240p here for allowing us to

    // test dropped rate here.

    ["privacy.resistFingerprinting.target_video_res", 240]

);

  var testCases = [

    { name:"seek.webm", type:"video/webm", width:320, height:240, duration:3.966, drop: false },

    { name:"gizmo.mp4", type:"video/mp4", width:560, height:320, duration:5.56, drop: true }

];

  function checkStats(v, shouldDrop) {

    // Rounding the current time to 100ms.

    const secondsPerAtom = MS_PER_TIME_ATOM / 1000;

    const currentTimeAtoms = Math.floor(v.currentTime / secondsPerAtom);

    const currentTime = currentTimeAtoms * secondsPerAtom;

    let dropRate = 0;

    if (shouldDrop) {

      dropRate = SPOOFED_DROPPED_RATIO;

    is(v.mozParsedFrames, parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND, 10),

        "mozParsedFrames should be spoofed if fingerprinting resistance is enabled");

    is(v.mozDecodedFrames, parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND, 10),

        "mozDecodedFrames should be spoofed if fingerprinting resistance is enabled");

    is(v.mozPresentedFrames,

        parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND * (1 - dropRate), 10),

        "mozPresentedFrames should be spoofed if fingerprinting resistance is enabled");

    is(v.mozPaintedFrames,

        parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND * (1 - dropRate), 10),

        "mozPaintedFrames should be spoofed if fingerprinting resistance is enabled");

    is(v.mozFrameDelay, 0.0,

        "mozFrameDelay should be 0.0 if fingerprinting resistance is enabled");

    let playbackQuality = v.getVideoPlaybackQuality();

    is(playbackQuality.totalVideoFrames, parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND, 10),

        "VideoPlaybackQuality.totalVideoFrames should be spoofed if fingerprinting resistance is enabled");

    is(playbackQuality.droppedVideoFrames, parseInt(currentTime * SPOOFED_FRAMES_PER_SECOND * dropRate, 10),

        "VideoPlaybackQuality.droppedVideoFrames should be spoofed if fingerprinting resistance is enabled");

  function startTest(test, token) {

    let v = document.createElement("video");

    v.token = token;

    v.src = test.name;

    manager.started(token);

    once(v, "ended", () => {

      checkStats(v, test.drop);

      removeNodeAndSource(v);

      manager.finished(v.token);

});

    v.play();

  manager.runTests(testCases, startTest);

</script>

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