<!DOCTYPE html>
<!-- Copyright © 2016 Chromium authors and World Wide Web Consortium, (Massachusetts Institute of Technology, ERCIM, Keio University, Beihang). -->
<html>
    <head>
        <title>SourceBuffer.mode == "sequence" test cases.</title>
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
        <script src="mediasource-util.js"></script>
    </head>
    <body>
        <div id="log"></div>
        <script>
          function mediasource_sequencemode_test(testFunction, description, options)
          {
              return mediasource_testafterdataloaded(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
              {
                  assert_greater_than(segmentInfo.media.length, 3, "at least 3 media segments for supported type");
                  mediaElement.addEventListener("error", test.unreached_func("Unexpected event 'error'"));
                  sourceBuffer.mode = "sequence";
                  assert_equals(sourceBuffer.mode, "sequence", "mode after setting it to \"sequence\"");

                  var initSegment = MediaSourceUtil.extractSegmentData(mediaData, segmentInfo.init);
                  test.expectEvent(sourceBuffer, "updatestart", "initSegment append started.");
                  test.expectEvent(sourceBuffer, "update", "initSegment append success.");
                  test.expectEvent(sourceBuffer, "updateend", "initSegment append ended.");
                  sourceBuffer.appendBuffer(initSegment);
                  test.waitForExpectedEvents(function()
                  {
                      assert_equals(sourceBuffer.timestampOffset, 0, "timestampOffset initially 0");
                      testFunction(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData);
                  });
              }, description, options);
          }

          function append_segment(test, sourceBuffer, mediaData, info, callback)
          {
              var mediaSegment = MediaSourceUtil.extractSegmentData(mediaData, info);
              test.expectEvent(sourceBuffer, "updatestart", "media segment append started.");
              test.expectEvent(sourceBuffer, "update", "media segment append success.");
              test.expectEvent(sourceBuffer, "updateend", "media segment append ended.");
              sourceBuffer.appendBuffer(mediaSegment);
              test.waitForExpectedEvents(callback);
          }

          // Verifies expected times to 3 decimal places before and after mediaSource.endOfStream(),
          // and calls |callback| on success.
          function verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                              expectedTimestampOffset, expectedBufferedRangeStartTime,
                                              expectedBufferedRangeMaxEndTimeBeforeEOS,
                                              expectedBufferedRangeEndTimeAfterEOS,
                                              callback) {
              assert_approx_equals(sourceBuffer.timestampOffset,
                                   expectedTimestampOffset,
                                   0.001,
                                   "expectedTimestampOffset");

              // Prior to EOS, the buffered range end time may not have fully reached the next media
              // segment's timecode (adjusted by any timestampOffset). It should not exceed it though.
              // Therefore, an exact assertBufferedEquals() will not work here.
              assert_greater_than(sourceBuffer.buffered.length, 0, "sourceBuffer.buffered has at least 1 range before EOS");
              assert_approx_equals(sourceBuffer.buffered.start(0),
                                   expectedBufferedRangeStartTime,
                                   0.001,
                                   "sourceBuffer.buffered range begins where expected before EOS");
              assert_less_than_equal(sourceBuffer.buffered.end(0),
                                     expectedBufferedRangeMaxEndTimeBeforeEOS + 0.001,
                                     "sourceBuffer.buffered range ends at or before expected upper bound before EOS");

              test.expectEvent(mediaSource, "sourceended", "mediaSource endOfStream");
              mediaSource.endOfStream();
              test.waitForExpectedEvents(function()
              {
                  assertBufferedEquals(sourceBuffer,
                                       "{ [" + expectedBufferedRangeStartTime.toFixed(3) + ", " + expectedBufferedRangeEndTimeAfterEOS.toFixed(3) + ") }",
                                       "sourceBuffer.buffered after EOS");
                  callback();
              });
          }

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              var offset = Math.min(segmentInfo.media[0].timev, segmentInfo.media[0].timea);
              var expectedStart = Math.max(segmentInfo.media[0].timev, segmentInfo.media[0].timea) - offset;
              var expectedEnd = Math.min(segmentInfo.media[0].endtimev, segmentInfo.media[0].endtimea) - offset;
              var expectedEndEOS = Math.max(segmentInfo.media[0].endtimev, segmentInfo.media[0].endtimea) - offset;
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[0], function()
              {
                  verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                             -offset, expectedStart,
                                             expectedEnd, expectedEndEOS,
                                             test.done);
              });
          }, "Test sequence AppendMode appendBuffer(first media segment)");

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              var offset = Math.min(segmentInfo.media[1].timev, segmentInfo.media[1].timea);
              var expectedStart = Math.max(segmentInfo.media[1].timev, segmentInfo.media[1].timea) - offset;
              var expectedEnd = Math.min(segmentInfo.media[1].endtimev, segmentInfo.media[1].endtimea) - offset;
              var expectedEndEOS = Math.max(segmentInfo.media[1].endtimev, segmentInfo.media[1].endtimea) - offset;
              assert_greater_than(Math.min(segmentInfo.media[1].timev, segmentInfo.media[1].timea), 0,
                                  "segment starts after time 0");
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[1], function()
              {
                  verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                             -offset, expectedStart,
                                             expectedEnd, expectedEndEOS,
                                             test.done);
              });
          }, "Test sequence AppendMode appendBuffer(second media segment)");

          mediasource_sequencemode_test(function(test, mediaElement, mediaSource, segmentInfo, sourceBuffer, mediaData)
          {
              assert_greater_than(Math.min(segmentInfo.media[1].timev, segmentInfo.media[1].timea), 0,
                                  "segment starts after time 0");
              append_segment(test, sourceBuffer, mediaData, segmentInfo.media[1], function()
              {
                  append_segment(test, sourceBuffer, mediaData, segmentInfo.media[0], function()
                  {
                      var firstOffset = Math.min(segmentInfo.media[1].timev, segmentInfo.media[1].timea);
                      var secondOffset = Math.max(segmentInfo.media[1].endtimev, segmentInfo.media[1].endtimea) - firstOffset;
                      var expectedStart = Math.max(segmentInfo.media[1].timev, segmentInfo.media[1].timea) - firstOffset;
                      var expectedEnd = Math.min(segmentInfo.media[0].endtimev, segmentInfo.media[0].endtimea) + secondOffset;
                      var expectedEndEOS = Math.max(segmentInfo.media[0].endtimev, segmentInfo.media[0].endtimea) + secondOffset;
                      // Current timestampOffset should reflect offset required to put media[0]
                      // immediately after media[1]'s highest frame end timestamp (as was adjusted
                      // by an earlier timestampOffset).
                      verify_offset_and_buffered(test, mediaSource, sourceBuffer,
                                                 secondOffset, expectedStart,
                                                 expectedEnd, expectedEndEOS,
                                                 test.done);
                  })
              });
          }, "Test sequence AppendMode appendBuffer(second media segment, then first media segment)");
        </script>
    </body>
</html>
