test.prototype.start = function()

in 2020/media/sphericalOnCobaltTest.js [107:163]
53 lines of code
9 McCabe index (conditional complexity)

    test.prototype.start = function(runner, video) {
      var self = this;
      var frameRateCount = 0;
      var averageFps = 0;

      if (!util.isCobalt()) {
        runner.fail('Device is not Cobalt.');
      } else if (!checkForMapToMeshSupport()) {
        runner.fail("No map-to-mesh support on Cobalt.");
      }
      if (!isTypeSupported(videoStream))
        runner.fail('Format is not supported.');

      var videoPerfMetrics = new VideoPerformanceMetrics(video);
      if (!videoPerfMetrics.supportsVideoPerformanceMetrics()) {
        runner.fail('UserAgent needs to support ' +
                    '\'video.getVideoPlaybackQuality\' or the combined ' +
                    '\'video.webkitDecodedFrameCount\'' +
                    'and video.webkitDroppedFrameCount to execute this test.');
      }
      setUpStyle(video);
      setupMse(video, runner, videoStream, Media.AAC.AudioNormal);
      video.addEventListener('timeupdate', function onTimeUpdate(e) {
        frameRateCount++;
        averageFps += getFPS();

        if (!video.paused && video.currentTime >= 15) {
          video.removeEventListener('timeupdate', onTimeUpdate);
          video.pause();
          averageFps = averageFps / frameRateCount;
          var droppedFrames = videoPerfMetrics.getDroppedVideoFrames();
          var minFps = Math.min(
              (videoPerfMetrics.getTotalDecodedVideoFrames() - droppedFrames) /
                  video.currentTime,
              averageFps);
          test.prototype.status =
              '(' + droppedFrames.toFixed(2) + ', ' + minFps.toFixed(2) + ')';
          runner.updateStatus();

          if (minFps <= 0) {
            runner.fail('UserAgent was unable to render any frames.');
          }
          // Screen refresh rates are capped at 60 so we shouldn't expect
          // greater than 60 fps perfomance.
          if (videoStream.get('fps') < 56) {
            var threshold = 0.994;
            runner.checkGE(
                minFps, videoStream.get('fps') * threshold, 'Video frame rate');
          } else {
            runner.checkGE(minFps, 56, 'Video frame rate');
          }
          runner.checkLE(droppedFrames, 1, 'Total dropped frames');
          runner.succeed();
        }
      });
      video.play();
    };