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  <title>Test for Bug 778077</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=778077">Mozilla Bug 778077</a>
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<pre id="test">
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  <script type="application/javascript">

    /** Test for Bug 778077 - HTMLMediaElement.fastSeek() **/
    // Iterate through a list of keyframe timestamps, and seek to
    // halfway between the keyframe and the keyframe after it.
    var manager = new MediaTestManager;

    function doSeek(v) {
      // fastSeek to half way between this keyframe and the next, or if this is the last
      // keyframe seek to halfway between this keyframe and the end of media.
      var nextKeyFrame = (v.keyframeIndex + 1) < v.keyframes.length ? v.keyframes[v.keyframeIndex + 1] : v.duration;
      v.target = (v.keyframes[v.keyframeIndex] + nextKeyFrame) / 2;
      v.fastSeek(v.target);
      ok(Math.abs(v.currentTime - v.target) < 0.01,
         v.name + " seekTo=" + v.target + " currentTime (" + v.currentTime + ") should be close to seek target initially");
    }

    function onloadedmetadata(event) {
      var v = event.target;
      doSeek(v);
    }

    function onseeked(event) {
      var v = event.target;
      var keyframe = v.keyframes[v.keyframeIndex];

      // Check that the current time ended up roughly after the keyframe.
      // We must be a bit fuzzy here, as the decoder backend may actually
      // seek to the audio sample prior to the keyframe.
      ok(v.currentTime >= keyframe - 0.05,
         v.name + " seekTo=" + v.target + " currentTime (" + v.currentTime +
         ") should be end up roughly after keyframe (" + keyframe + ") after fastSeek");

      ok(v.currentTime <= v.target,
         v.name + " seekTo=" + v.target + " currentTime (" + v.currentTime +
         ") should be end up less than target after fastSeek");

      v.keyframeIndex++
      if (v.keyframeIndex == v.keyframes.length) {
        v.src = "";
        v.remove();
        manager.finished(v.token);
      } else {
        doSeek(v);
      }
    }

    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, v.name + " - video should have at least one sync point");
      v.addEventListener("loadedmetadata", onloadedmetadata);
      v.addEventListener("seeked", onseeked);
      document.body.appendChild(v);
    }

    manager.runTests(gFastSeekTests, startTest);

  </script>
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