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Test Info: Warnings
-
CI results over the last 21 days
- This test runs only with pattern: asan
- Manifest: dom/media/webaudio/test/mochitest.toml
<!DOCTYPE HTML>
<html>
<meta charset=utf-8>
<head>
<title>Test for Bug 2059164 - a captured low-rate media element resampled into a high-rate context stays silent</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="webaudio_asan_fill.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
// Capturing this 1 Hz stereo FLAC into a 262145 Hz context asks the resampler
// for more output frames than a buffer can hold, so the chunk is rejected and
// every channel must stay silent. A non-silent sample on channel 1 therefore
// means the graph emitted samples the resampler never produced. On ASan builds
// such samples carry the allocator's fill word, which the probe counts
// separately so the two cases can be told apart in the failure message.
// The fixture is one 16384-frame block declaring 1 Hz.
const FIXTURE_FRAMES = 16384;
const FIXTURE_RATE = 1;
// 262144 Hz makes the output length wrap to zero; the next rate up is the
// smallest that still asks for more than a buffer can hold.
const RATE_WRAPPING_TO_ZERO = 2 ** 32 * FIXTURE_RATE / FIXTURE_FRAMES;
const CTX_RATE = RATE_WRAPPING_TO_ZERO + 1;
// Observe two seconds of graph time after playback starts. Counting graph frames
// rather than wall-clock time means a loaded machine cannot end the window early.
const OBSERVE_SECONDS = 2;
const OBSERVE_FRAMES = Math.ceil(CTX_RATE * OBSERVE_SECONDS);
let finished = false;
function finish(verdict) {
if (finished) {
return;
}
finished = true;
verdict();
SimpleTest.finish();
}
async function runTest() {
if (!asanVerifyFillOptions()) {
SimpleTest.finish();
return;
}
// Autoplay so the captured element drives the resample path with no gesture.
await SpecialPowers.pushPrefEnv({ set: [
["media.autoplay.default", 0],
["media.autoplay.blocking_policy", 0],
] });
const ctx = new AudioContext({ sampleRate: CTX_RATE });
await ctx.audioWorklet.addModule("webaudio_channel_fill_probe_processor.js");
const audio = new Audio("bug2059164_1hz_stereo.flac");
// A load failure means the resample path was not exercised.
audio.onerror = () => finish(() => ok(false,
`the 1 Hz FLAC failed to load (error code ` +
`${audio.error && audio.error.code}), so the resample path was never ` +
`exercised`));
// Input 0 is captured audio; input 1 is the playback marker.
const probe = new AudioWorkletNode(ctx, "channel-fill-probe", {
numberOfInputs: 2,
numberOfOutputs: 0,
processorOptions: {
fillWord: ASAN_EXPECTED_SENTINEL,
budgetFrames: OBSERVE_FRAMES,
},
});
// A processor failure would otherwise appear as a harness timeout.
probe.onprocessorerror = () => finish(() => ok(false,
"the channel fill probe failed, so no samples were scanned"));
probe.port.onmessage = ({ data }) => finish(() => {
if (data.nonSilent) {
ok(false,
`channel 1 emitted ${data.nonSilent} samples the resampler never ` +
`produced (${data.fillWords} carrying the allocator fill word)`);
} else {
ok(true,
`channel 1 stayed silent across ${data.frames} frames after playback ` +
`started`);
}
});
ctx.createMediaElementSource(audio).connect(probe, 0, 0);
// Start the probe's observation window when playback begins. The marker
// only opens it; every quantum is scanned regardless.
const playbackMarker = new ConstantSourceNode(ctx, { offset: 1 });
playbackMarker.connect(probe, 0, 1);
audio.addEventListener("playing", () => playbackMarker.start(), { once: true });
await ctx.resume();
audio.play().catch(e => finish(() => ok(false,
`playback of the 1 Hz FLAC was refused (${e.name}), so the resample path ` +
`was never exercised`)));
}
runTest().catch(e => finish(() => ok(false, "unexpected exception: " + e)));
</script>
</pre>
</body>
</html>