test.prototype.onsourceopen = function()

in 2020/media/mseCodecTest.js [842:889]
42 lines of code
4 McCabe index (conditional complexity)

  test.prototype.onsourceopen = function() {
    var runner = this.runner;
    var media = this.video;
    var chain = new FileSource(stream.src, runner.XHRManager, runner.timeouts);
    var sb = this.ms.addSourceBuffer(stream.mimetype);
    var unused_sb = this.ms.addSourceBuffer(unused_stream.mimetype);
    var bufs = [];

    var i = 0;
    // Append order of the segments.
    var appendOrder = [0, 2, 1, 4, 3];
    // Number of segments given the append order, since segments get merged.
    var bufferedLength = [0, 1, 1, 2, 1];

    sb.addEventListener('updateend', function() {
      runner.checkEq(sb.buffered.length, bufferedLength[i],
          'Source buffer number');
      if (i == 1) {
        runner.checkGr(sb.buffered.start(0), 0, 'Range start');
      } else if (i > 0) {
        runner.checkEq(sb.buffered.start(0), 0, 'Range start');
      }

      i++;
      if (i >= bufs.length) {
        runner.succeed();
      } else {
        sb.appendBuffer(bufs[appendOrder[i]]);
      }
    });

    chain.init(0, function(buf) {
      bufs.push(buf);
      chain.pull(function(buf) {
        bufs.push(buf);
        chain.pull(function(buf) {
          bufs.push(buf);
          chain.pull(function(buf) {
            bufs.push(buf);
            chain.pull(function(buf) {
              bufs.push(buf);
              sb.appendBuffer(bufs[0]);
            });
          });
        });
      });
    });
  };