test_AppendMultipleInitOpusAudio.html

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  <title>MSE: Append multiple Opus init segments (bug 1341228)</title>

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

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// Bug 1341228 reproducer, modelled after YouTube TV conformance test

// 'AppendMultipleInitOpusAudio' (test 11 in the ytlr-cert rig).

//

// The flow:

//   1. Append the Opus init segment 10 times.

//   2. Append a media segment (one Cluster) and record buffered.end(0).

//   3. abort() the SourceBuffer.

//   4. Append the Opus init segment 10 more times.

//   5. Verify buffered.end(0) is unchanged.

//

// The init segment fixture (bug1341228_init.webm) is the first 591 bytes of

// car_opus_low.webm from YouTube's conformance media set, containing EBML

// header + Segment header + SeekHead + Void + SegmentInfo + Tracks + Cues.

// The Cues element appears before any Cluster, which is spec-allowed but

// historically tickled bugs in the WebM init-segment parsing path.

SimpleTest.waitForExplicitFinish();

async function appendN(sb, buf, count) {

  for (let i = 0; i < count; i++) {

    sb.appendBuffer(new Uint8Array(buf));

    await once(sb, "updateend");

runWithMSE(async (ms, _v) => {

  await once(ms, "sourceopen");

  const sb = ms.addSourceBuffer('audio/webm; codecs="opus"');

  const init = await fetchWithXHR("bug1341228_init.webm");

  const cluster = await fetchWithXHR("bug1341228_cluster.webm");

  info("- first round: append init x10 -");

  await appendN(sb, init, 10);

  info("- append media cluster -");

  sb.appendBuffer(new Uint8Array(cluster));

  await once(sb, "updateend");

  is(sb.buffered.length, 1, "should have one buffered range after cluster");

  const expectedEnd = sb.buffered.end(0);

  info(`- recorded buffered.end(0) = ${expectedEnd} -`);

  info("- abort source buffer -");

  sb.abort();

  info("- second round: append init x10 -");

  await appendN(sb, init, 10);

  info(`- buffered.end(0) after second round = ${sb.buffered.end(0)} -`);

  is(sb.buffered.length, 1,

     "should still have one buffered range after second init round");

  is(sb.buffered.end(0), expectedEnd,

     "buffered.end(0) must be unchanged across abort + multi-init append");

  SimpleTest.finish();

});

</script>

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