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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-analysernode-interface/test-analyser-resume-after-suspended.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta name="timeout" content="long">
<title>AnalyzerNode resumed after suspended</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
function areFloat32ArraysEqual(arr1, arr2) {
if (arr1.length !== arr2.length) {
return false;
}
for (let i = 0; i < arr1.length; i++) {
if (arr1[i] !== arr2[i]) {
return false;
}
}
return true;
}
// This test ensures that calling suspend() does not clear or reset
// the AnalyserNode, and that after resuming the AudioContext,
// it continues retrieving valid data without any interruptions.
promise_test(async () => {
function runTest(resolve) {
const context = new AudioContext();
context.suspend();
const oscillator = new OscillatorNode(context);
oscillator.connect(context.destination);
oscillator.start();
const analyser = new AnalyserNode(context);
oscillator.connect(analyser);
let analyserReadCount = 0;
let lastTime = 0;
// Time between checks in milliseconds.
const interval = 300;
let previousTimeDomainDataArray =
new Float32Array(analyser.frequencyBinCount);
// The analyser.getFloatTimeDomainData() is called every 300 ms under
// suspended or resumed state. If it is a suspended state, the value
// from the function should be the same as the previous value. If
// it is a resumed state, the value should be different.
async function readAnalyserData(timestamp) {
if (lastTime === 0) {
lastTime = timestamp;
}
const elapsed = timestamp - lastTime;
// Only run the readAnalyserData every 300ms in order to give enough time
// for context to pull the data.
if (elapsed >= interval) {
analyserReadCount++;
let shouldSkipAsserts = false;
switch (analyserReadCount) {
case 1:
shouldSkipAsserts = true;
break;
case 10:
await context.suspend();
shouldSkipAsserts = true;
break;
case 5:
case 15:
await context.resume();
shouldSkipAsserts = true;
break;
case 20:
oscillator.stop();
resolve();
break;
default:
break;
}
const timeDomainDataArray =
new Float32Array(analyser.frequencyBinCount);
analyser.getFloatTimeDomainData(timeDomainDataArray);
if (!shouldSkipAsserts) {
let result = areFloat32ArraysEqual(timeDomainDataArray,
previousTimeDomainDataArray);
context.state === 'suspended' ? assert_true(result)
: assert_false(result);
}
previousTimeDomainDataArray.set(timeDomainDataArray);
lastTime = timestamp;
}
requestAnimationFrame(readAnalyserData);
}
requestAnimationFrame(readAnalyserData);
}
return new Promise((resolve) => runTest(resolve));
}, 'AnalyserNode resume after suspended');
</script>