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<!doctype html>
<title>Test clone of disabled audio track from getUserMedia()</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body></body>
<script>
'use strict';
async function promise_is_track_silent(track) {
const ctx = new AudioContext();
const sourceNode =
new MediaStreamTrackAudioSourceNode(ctx, {mediaStreamTrack: track});
const processor = ctx.createScriptProcessor(8192, 1, 0);
sourceNode.connect(processor);
const e = await new Promise(resolve => processor.onaudioprocess = resolve);
ctx.close();
const input = e.inputBuffer.getChannelData(0);
for (const sample of input) {
if (sample != 0.0) {
return false;
}
}
return true;
}
promise_test(async t => {
const stream = await navigator.mediaDevices.getUserMedia({audio: true});
const [track] = stream.getTracks();
track.enabled = false;
// media.getusermedia.microphone.off_while_disabled.delay_ms is 0.
// Allow some events to be processed for DeviceListener::SetDeviceEnabled()
// to change mDeviceState.mDeviceEnabled.
for (const i of Array(2).keys()) {
await new Promise(resolve => t.step_timeout(resolve, 0));
}
const clone = track.clone();
assert_false(clone.enabled, 'clone.enabled');
assert_true(await promise_is_track_silent(clone),
'clone silent before enabled');
clone.enabled = true;
assert_false(await promise_is_track_silent(clone),
'clone silent after enabled');
assert_false(track.enabled, 'track.enabled');
assert_true(await promise_is_track_silent(track), 'track silent');
}, 'clone of disabled getUserMedia() audio track');
</script>
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