test_vp9_buffer_overread.html

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  <title>Test VP9 sw decoding with custom buffer allocation (bug 2073852)</title>

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

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<pre id="test">

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

// VP9 video whose chroma plane dimensions (128x64) are exact multiples of

// the SIMD alignment, leaving zero within-row slack.  Without trailing

// padding in the decode buffer the AVX-512 horizontal filter over-reads

// past the allocation (bug 2073852).

add_task(async function testVP9OverreadPlayback() {

  let video = document.createElement('video');

  info(`try to play VP9 aligned video`);

  video.preload = "auto";

  video.src = "vp9_256x128.webm";

  document.body.appendChild(video);

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

  ok(await new Promise(r => video.onended = r).then(_=>true, _=>false),

     "video played to end");

  removeNodeAndSource(video);

});

</script>

</pre>

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