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https://bugzilla.mozilla.org/show_bug.cgi?id=1022913
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  <title>Test for Bug 1022913</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1022913">Mozilla Bug 1022913</a>
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<div id="content" style="display: none">

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<pre id="test">
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  <script type="application/javascript">

    // Test that if we're doing a fastSeek() forwards that we don't end up
    // seeking backwards. This can happen if the keyframe before the seek
    // target is before the current playback position. We'd prefer to seek to
    // the keyframe after the seek target in this case, but we don't implement
    // this yet (bug 1026330).
    var manager = new MediaTestManager;

    var onSecondSeekComplete = function(event) {
      var v = event.target;
      v.removeEventListener("seeked", onSecondSeekComplete);
      ok(v.currentTime >= v.firstSeekTarget, v.name + " seek never go backwards. time=" + v.currentTime + " firstSeekTarget=" + v.firstSeekTarget + " secondSeekTarget=" + v.secondSeekTarget);
      manager.finished(v.token);
      removeNodeAndSource(v);
    };

    var onFirstSeekComplete = function(event) {
      var v = event.target;
      v.removeEventListener("seeked", onFirstSeekComplete);
      // Seek to 75% of the way between the start and the first keyframe
      // using fastSeek. We then test that the currentTime doesn't drop back
      // to the previous keyframe, currentTime should go forwards.
      v.addEventListener("seeked", onSecondSeekComplete);
      v.secondSeekTarget = v.keyframes[1] * 0.75;
      v.fastSeek(v.secondSeekTarget);
    }

    var onLoadedMetadata = function(event) {
      // Seek to the mid-point between the start and the first keyframe.
      var v = event.target;
      v.removeEventListener("loadedmetadata", onLoadedMetadata);
      v.addEventListener("seeked", onFirstSeekComplete);
      v.firstSeekTarget = v.keyframes[1] * 0.5;
      v.currentTime = v.firstSeekTarget;
    }

    function startTest(test, token) {
      manager.started(token);
      let v = document.createElement("video");
      v.src = test.name;
      v.name = test.name;
      v.preload = "metadata";
      v.token = token;
      v.target = 0;
      v.keyframes = test.keyframes;
      v.keyframeIndex = 0;
      ok(v.keyframes.length >= 2, v.name + " - video should have at least two sync points");
      v.addEventListener("loadedmetadata", onLoadedMetadata);
      document.body.appendChild(v);
    }

    manager.runTests(gFastSeekTests, startTest);

  </script>
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