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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<title>Unknown Track Number in Third Block</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="mediasource-util.js"></script>
</head>
<body>
</body>
<script>
// Test that an unknown track number in the third webm block triggers the
// append error algorithm.
// https://w3c.github.io/media-source/#byte-stream-formats
// The user agent MUST run the append error algorithm when any combination of
// an initialization segment and any contiguous sequence of media segments
// satisfies the following conditions:
// 1. The number and type (audio, video, text, etc.) of all tracks in the
// media segments are not identified.
promise_test(async t => {
const audio = document.createElement('audio');
audio.controls = true;
audio.watcher = new EventWatcher(t, audio, ['error']);
document.body.appendChild(audio);
const source = new MediaSource();
source.watcher = new EventWatcher(t, source, ['sourceopen']);
audio.src = URL.createObjectURL(source);
await source.watcher.wait_for('sourceopen');
const resource = await MediaSourceUtil.fetchResourceOfManifest(
t, 'webm/test-a-128k-44100Hz-1ch-manifest.json');
assert_implements_optional(MediaSource.isTypeSupported(resource.type),
`${resource.type} supported`);
const buffer = source.addSourceBuffer(resource.type);
buffer.watcher = new EventWatcher(t, buffer, ['error', 'updateend']);
// Intentionally append data ending at the end of a cluster having an
// invalid track number in a block that is after the second block in the
// cluster, because Gecko had a bug that failed to detect some demux errors
// in this situation.
resource.data = resource.data.subarray(0, resource.cluster_start[1]);
// Choose a track number of zero, which is not in the init segment.
const track_number = 0;
// Set the high bit of an octet, for a single-octet EBML VINT.
const track_number_vint = 1 << 7 | track_number;
// Skip two bytes for the EBML element ID and data size, and overwrite the
// track number.
resource.data[Number(resource.block_start[2]) + 2] = track_number_vint;
buffer.appendBuffer(resource.data);
await Promise.all([
buffer.watcher.wait_for(['error', 'updateend']),
audio.watcher.wait_for('error'),
]);
}, 'invalid-third-block');
</script>
</html>
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