test_BufferingWait_OffsetTimestamps_mp4.html

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  <title>MSE: Playback must not stall when buffer starts at a non-zero timestamp</title>

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<pre id="test"><script class="testbody" type="text/javascript">

// When an HLS/MSE stream's buffer starts at a non-zero timestamp, MDSM's

// BufferingState must request video data at the current media time, not at time=0.

SimpleTest.waitForExplicitFinish();

runWithMSE(async (ms, v) => {

  await once(ms, "sourceopen");

  const audiosb = ms.addSourceBuffer("audio/mp4");

  const videosb = ms.addSourceBuffer("video/mp4");

  // Shift all segment timestamps by 8 seconds, simulating an HLS stream whose

  // first segment starts at t=8 in the media timeline.

  const kBufferStart = 8;

  audiosb.timestampOffset = kBufferStart;

  videosb.timestampOffset = kBufferStart;

  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["init"], ".mp4");

  await fetchAndLoad(audiosb, "bipbop/bipbop_audio", ["1"], ".m4s");

  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["init"], ".mp4");

  await fetchAndLoad(videosb, "bipbop/bipbop_video", ["1"], ".m4s");

  // Buffered range is now [~8, ~9] for both tracks.

  info(`Audio buffered: ${timeRangeToString(audiosb.buffered)}`);

  info(`Video buffered: ${timeRangeToString(videosb.buffered)}`);

  // Seek to the start of the buffered region.

  v.currentTime = kBufferStart;

  ok(await v.play().then(_ => true, _ => false), "video started playing");

  SimpleTest.finish();

});

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