test_H264_SPS_InvalidDimensions.html

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<html>

<head>

  <title>MSE: HTMLVideoElement behaviour when fed an H.264 init segment with an oversized SPS picture width.</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script type="text/javascript" src="mediasource.js"></script>

  <script type="text/javascript" src="h264_sps_utils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

</head>

<body>

<pre id="test">

<script class="testbody" type="text/javascript">

SimpleTest.waitForExplicitFinish();

runWithMSE(async (ms, video) => {

  await once(ms, "sourceopen");

  ok(true, "MediaSource opened");

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

  // Fetch a known-good init segment to use as the chassis. The splice below

  // only rewrites the avcC SPS, so the container's display dimensions (read

  // from tkhd) are unchanged and are what the video element must fall back to.

  info("Fetching bipbop_videoinit.mp4 as chassis");

  const initBuffer = await fetchWithXHR("bipbop/bipbop_videoinit.mp4");

  const { width: containerWidth, height: containerHeight } =

    parseDisplayDimensions(initBuffer);

  info(`Container display dimensions: ${containerWidth}x${containerHeight}`);

  // Craft an SPS with a very large pic_width_in_mbs_minus1 so the computed

  // picture width is too large to be usable. The parser rejects it, so the

  // demuxer falls back to the container's display dimensions (400x300). The

  // init segment is therefore accepted and loadedmetadata fires with the

  // container size.

  const craftedSps = buildSPSNALU(0x0FFFFFFE, 9);

  const malformedInit = spliceSPSIntoInitSegment(initBuffer, craftedSps);

  info(`Crafted init segment: ${malformedInit.length} bytes`);

  // Register the listener before appending. The init segment must be accepted

  // and surface metadata with the container dimensions; otherwise loadedmetadata

  // never fires and the test times out at the harness level.

  const loadedMetadata = once(video, "loadedmetadata");

  info("Appending crafted init segment via SourceBuffer");

  sb.appendBuffer(malformedInit);

  await loadedMetadata;

  info(`videoWidth=${video.videoWidth}, videoHeight=${video.videoHeight}, ` +

       `readyState=${video.readyState}`);

  is(video.videoWidth, containerWidth,

     "videoWidth falls back to the container display width");

  is(video.videoHeight, containerHeight,

     "videoHeight falls back to the container display height");

  SimpleTest.finish();

});

</script>

</pre>

</body>

</html>