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Bug 1703603 - Add a mochitest for bug 1703603. r=bryce

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This tests two things: whether `mozCaptureStreamUntilEnded` is handled correctly
when the media element source is a `MediaSource`, and whether all objects have
references to each other as to not garbage collect any part of the system.

Differential Revision: https://phabricator.services.mozilla.com/D116397
This commit is contained in:
Paul Adenot 2021-06-02 14:20:40 +00:00
parent 78824dbdc4
commit 80b6805757
2 changed files with 73 additions and 0 deletions
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1
dom/media/mediasource/test/mochitest.ini
View File

@ -88,6 +88,7 @@ skip-if = os == 'win' # bug 1487973,
[test_LoadedMetadataFired.html]
[test_LoadedMetadataFired_mp4.html]
[test_MediaSource.html]
[test_MediaSource_capture_gc.html]
[test_MediaSource_memory_reporting.html]
[test_MediaSource_mp4.html]
[test_MediaSource_flac_mp4.html]

72
dom/media/mediasource/test/test_MediaSource_capture_gc.html Normal file
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@ -0,0 +1,72 @@
<!DOCTYPE HTML>
<html>
<head>
<title>Test garbage collection of captured stream, when playing a MediaSource</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<script type="text/javascript" src="mediasource.js"></script>
</head>
<pre id="test">
<script class="testbody" type="text/javascript">
function forceGC() {
SpecialPowers.gc();
SpecialPowers.forceGC();
SpecialPowers.forceCC();
}
SimpleTest.waitForExplicitFinish();
window.onload = async function() {
// Create an infinite source using a MediaSource
let el = document.createElement("audio");
const ms = new MediaSource();
el.src = URL.createObjectURL(ms);
await once(ms, "sourceopen");
const sb = ms.addSourceBuffer("video/mp4");
await fetchAndLoad(sb, "bipbop/bipbop_audio", ["init"], ".mp4");
await fetchAndLoad(sb, "bipbop/bipbop_audio", range(1, 11), ".m4s");
setInterval(async function() {
sb.timestampOffset = sb.buffered.end(sb.buffered.length - 1);
await fetchAndLoad(sb, "bipbop/bipbop_audio", range(1, 11), ".m4s");
}, 8000);
el.play();
// Analyze the media element output.
const ac = new AudioContext;
const analyzer = ac.createAnalyser();
// bug 1703603
const stream = el.mozCaptureStreamUntilEnded();
const mss = ac.createMediaStreamSource(stream);
const gain = ac.createGain();
// compensate mochitest volume scaling, but don't connect to the AudioContext's
// destination to avoid noise during the test
gain.gain.value = 90;
mss.connect(gain).connect(analyzer);
// Drop the media element reference: it is supposed to be kept alive by the
// AudioContext via the `MediaStream`.
el = null;
// check whether the media element is still playing using the analyzer, spam the
// GC to ensure all refs are kept.
const buf = new Float32Array(analyzer.frequencyBinCount);
const startTime = Date.now();
function checkNonSilent() {
analyzer.getFloatFrequencyData(buf);
forceGC();
// Wait a good 20 seconds.
if (Date.now() - startTime < 2000) {
requestAnimationFrame(checkNonSilent);
} else {
ok(true, "All objects were kept alive.");
SimpleTest.finish();
}
}
checkNonSilent();
}
</script>
</pre>
</body>
</html>