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<!DOCTYPE html>
<html>
<title>Test basic encoded chunk buffering and playback with MediaSource</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup(() => {
assert_implements(
SourceBuffer.prototype.hasOwnProperty('appendEncodedChunks'),
'SourceBuffer prototype hasOwnProperty "appendEncodedChunks", used ' +
'here to feature detect MSE-for-WebCodecs implementation.');
});
// TODO(crbug.com/1144908): Consider extracting metadata into helper library
// shared with webcodecs tests. This metadata is adapted from webcodecs/video-decoder-any.js.
let vp9 = {
async buffer() { return (await fetch('vp9.mp4')).arrayBuffer(); },
// Note, file might not actually be level 1. See original metadata in webcodecs test suite.
codec: "vp09.00.10.08",
frames: [{offset: 44, size: 3315, type: 'key'},
{offset: 3359, size: 203, type: 'delta'},
{offset: 3562, size: 245, type: 'delta'},
{offset: 3807, size: 172, type: 'delta'},
{offset: 3979, size: 312, type: 'delta'},
{offset: 4291, size: 170, type: 'delta'},
{offset: 4461, size: 195, type: 'delta'},
{offset: 4656, size: 181, type: 'delta'},
{offset: 4837, size: 356, type: 'delta'},
{offset: 5193, size: 159, type: 'delta'}]
};
async function getOpenMediaSource(t) {
return new Promise(async resolve => {
const v = document.createElement('video');
document.body.appendChild(v);
const mediaSource = new MediaSource();
const url = URL.createObjectURL(mediaSource);
mediaSource.addEventListener('sourceopen', t.step_func(() => {
URL.revokeObjectURL(url);
assert_equals(mediaSource.readyState, 'open', 'MediaSource is open');
resolve([ v, mediaSource ]);
}), { once: true });
v.src = url;
});
}
promise_test(async t => {
let buffer = await vp9.buffer();
let [ videoElement, mediaSource ] = await getOpenMediaSource(t);
videoElement.controls = true; // Makes early prototype demo playback easier to control manually.
let sourceBuffer = mediaSource.addSourceBuffer({ videoConfig: { codec: vp9.codec } });
let next_timestamp = 0;
let frame_duration = 100 * 1000; // 100 milliseconds
// forEach with async callbacks makes it too easy to have uncaught rejections
// that don't fail this promise_test or even emit harness error.
// Iterating explicitly instead.
for (i = 0; i < vp9.frames.length; i++, next_timestamp += frame_duration) {
let frame_metadata = vp9.frames[i];
await sourceBuffer.appendEncodedChunks(new EncodedVideoChunk( {
type: frame_metadata.type,
timestamp: next_timestamp,
duration: frame_duration,
data: new Uint8Array(buffer, frame_metadata.offset, frame_metadata.size)
}));
}
mediaSource.endOfStream();
return new Promise( (resolve, reject) => {
videoElement.onended = resolve;
videoElement.onerror = reject;
videoElement.play();
});
}, "Buffer EncodedVideoChunks (VP9) one-by-one and play them with MSE");
// TODO(crbug.com/1144908): More exhaustive tests (multiple sourcebuffers,
// varying append patterns, invalid append patterns; eventually more codecs,
// out-of-order DTS, durations, etc.)
</script>
</html>
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