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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>MSE: loop-back data not available yet (shorter MUTED audio)</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="mediasource.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script class="testbody" type="text/javascript">
+
+/**
+ * This test is used to check whether a looping video can loop back successfully
+ * when it has a shorter MUTED audio track than its video track. When reaching
+ * EOS for the shorter track, there is no loop-back data at the start position
+ * (they are not appended yet) Even that, we should still be able to loop back
+ * but the looping would become non-seamless in this situation.
+ */
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(async (ms, el) => {
+ await once(ms, "sourceopen");
+ ok(true, "Receive a sourceopen event");
+ const videosb = ms.addSourceBuffer("video/mp4");
+ const audiosb = ms.addSourceBuffer("audio/mp4");
+
+ // Here we create a shorter audio than video.
+ info(`create different length source buffers`);
+ await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");
+ await fetchAndLoad(videosb, "bipbop/bipbop_video", range(5, 8), ".m4s");
+ audiosb.appendWindowEnd = videosb.buffered.end(0) - 0.2;
+ await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");
+ await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(5, 8), ".m4s");
+ ms.endOfStream();
+ await Promise.all([once(el, "durationchange"), once(ms, "sourceended")]);
+ info(`audio=[${audiosb.buffered.start(0)}-${audiosb.buffered.end(0)}], video=[${videosb.buffered.start(0)}-${videosb.buffered.end(0)}]`);
+ ok(true, `endOfStream completed, buffer=[${el.buffered.start(0)}, ${el.buffered.end(0)}]`);
+ ok(videosb.buffered.end(0) > audiosb.buffered.end(0), `video should be longer than audio`);
+
+ info(`seek to the position where buffered data exists`);
+ el.muted = true;
+ el.loop = true;
+ el.controls = true;
+ el.currentTime = el.buffered.start(0);
+ await el.play();
+
+ info(`video should trigger seeking when reaching to the end`);
+ let seekingCount = 0, seekedCount = 0;
+ el.addEventListener("seeking", () => {
+ is(++seekingCount, 1, "should only receive seeking once!");
+ });
+ el.addEventListener("seeked", () => {
+ is(++seekedCount, 1, "should only receive seeked once!");
+ });
+ await once(el, "seeking");
+
+ info(`trim old data before append new data`);
+ let p = Promise.all([once(videosb, "updateend"), once(audiosb, "updateend")]);
+ videosb.remove(videosb.buffered.start(0), videosb.buffered.end(0));
+ audiosb.remove(audiosb.buffered.start(0), audiosb.buffered.end(0));
+ await p;
+
+ info(`append new data`);
+ const seekedPromise = once(el, "seeked");
+ p = Promise.all([once(videosb, "updateend"), once(audiosb, "updateend")]);
+ await fetchAndLoad(videosb, "bipbop/bipbop_video", range(1, 2), ".m4s");
+ await fetchAndLoad(audiosb, "bipbop/bipbop_audio", range(1, 2), ".m4s");
+ await p;
+ info(`audio=[${audiosb.buffered.start(0)}-${audiosb.buffered.end(0)}], video=[${videosb.buffered.start(0)}-${videosb.buffered.end(0)}]`);
+
+ info(`now we should be able to finish seeking to the start position`);
+ await seekedPromise;
+
+ SimpleTest.finish(SimpleTest);
+});
+
+</script>
+</body>
+</html>