testing/web-platform/tests/media-source/mediasource-redundant-seek.html

   1 <!DOCTYPE html>
   2 <!-- Copyright © 2016 Chromium authors and World Wide Web Consortium, (Massachusetts Institute of Technology, ERCIM, Keio University, Beihang). -->
   3 <html>
   4     <head>
   5         <title>Test MediaSource behavior when receiving multiple seek requests during a pending seek.</title>
   6         <meta name="timeout" content="long">
   7         <script src="/resources/testharness.js"></script>
   8         <script src="/resources/testharnessreport.js"></script>
   9         <script src="mediasource-util.js"></script>
  10     </head>
  11     <body>
  12         <div id="log"></div>
  13         <script>
  14
  15             mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
  16             {
  17                 mediaElement.play();
  18
  19                 // Append all media data for complete playback.
  20                 test.expectEvent(sourceBuffer, 'updateend', 'sourceBuffer end update.');
  21                 test.expectEvent(mediaElement, 'loadedmetadata', 'Reached HAVE_METADATA');
  22                 test.expectEvent(mediaElement, 'playing', 'Playing media.');
  23                 sourceBuffer.appendBuffer(mediaData);
  24
  25                 test.waitForExpectedEvents(function()
  26                 {
  27                     var bufferedRanges = mediaElement.buffered;
  28
  29                     assert_greater_than_equal(mediaElement.duration, 4.0, 'Duration is >= 4.0s');
  30                     assert_equals(bufferedRanges.length, 1, 'Just one buffered range');
  31                     assert_less_than_equal(bufferedRanges.start(0), 1.0, 'Buffered range starts <= 1.0s');
  32                     assert_greater_than_equal(bufferedRanges.end(0), 4.0, 'Buffered range ends >= 4.0s');
  33
  34                     test.expectEvent(mediaElement, 'seeking', 'seeking');
  35                     test.expectEvent(mediaElement, 'timeupdate', 'timeupdate');
  36                     test.expectEvent(mediaElement, 'seeked', 'seeked');
  37
  38                     // Request seeks.
  39                     mediaElement.currentTime = 1.0;
  40
  41                     // This 'ephemeral' seek should be invisible to javascript, except any latency incurred in its processing.
  42                     mediaElement.currentTime = 3.0;
  43
  44                     mediaElement.currentTime = 1.0;
  45
  46                     assert_true(mediaElement.seeking, 'Element is seeking');
  47                     assert_equals(mediaElement.currentTime, 1.0, 'Element time is at last seek time');
  48                 });
  49
  50                 test.waitForExpectedEvents(function()
  51                 {
  52                     // No more seeking or seeked events should occur.
  53                     mediaElement.addEventListener('seeking', test.unreached_func("Unexpected event 'seeking'"));
  54                     mediaElement.addEventListener('seeked', test.unreached_func("Unexpected event 'seeked'"));
  55
  56                     assert_false(mediaElement.seeking, 'Element is not seeking');
  57                     assert_greater_than_equal(mediaElement.currentTime, 1.0, 'Element time is at or after last seek time');
  58                     assert_less_than(mediaElement.currentTime, 3.0, 'Element time is before the ephemeral seek time');
  59
  60                     var timeBeforeWait = mediaElement.currentTime;
  61                     test.waitForCurrentTimeChange(mediaElement, function()
  62                     {
  63                         // Time should have advanced a little, but not yet reached the ephemeral seek time.
  64                         assert_greater_than(mediaElement.currentTime, timeBeforeWait, 'Element time has increased');
  65                         assert_less_than(mediaElement.currentTime, 3.0, 'Element time is still before the ephemeral seek time');
  66                         test.done();
  67                     });
  68                 });
  69             }, 'Test redundant fully prebuffered seek');
  70
  71         </script>
  72     </body>
  73 </html>