forked from mirrors/gecko-dev
24705cb816
Differential Revision: https://phabricator.services.mozilla.com/D61904 --HG-- extra : moz-landing-system : lando
61 lines
1.8 KiB
JavaScript
61 lines
1.8 KiB
JavaScript
/**
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* This test is used to make sure we won't show the sound indicator for silent
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* web audio.
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*/
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/* eslint-disable mozilla/no-arbitrary-setTimeout */
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"use strict";
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async function waitUntilAudioContextStarts() {
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const ac = content.ac;
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if (ac.state == "running") {
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return;
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}
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await new Promise(resolve => {
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ac.onstatechange = () => {
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if (ac.state == "running") {
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ac.onstatechange = null;
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resolve();
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}
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};
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});
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}
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add_task(async function testSilentAudioContext() {
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info(`- create new tab -`);
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const tab = await BrowserTestUtils.openNewForegroundTab(
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window.gBrowser,
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"about:blank"
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);
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const browser = tab.linkedBrowser;
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info(`- create audio context -`);
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// We want the same audio context to be used across different content tasks
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await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
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content.ac = new content.AudioContext();
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const ac = content.ac;
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const dest = ac.destination;
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const source = ac.createBufferSource();
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const buf = ac.createBuffer(1, 3 * ac.sampleRate, ac.sampleRate);
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const bufData = Cu.cloneInto(buf.getChannelData(0), {});
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for (let idx = 0; idx < buf.length; idx++) {
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bufData[idx] = 0.0;
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}
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source.buffer = buf;
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source.connect(dest);
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source.start();
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});
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info(`- check AudioContext's state -`);
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await SpecialPowers.spawn(browser, [], waitUntilAudioContextStarts);
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ok(true, `AudioContext is running.`);
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info(`- should not show sound indicator -`);
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// If we do the next step too early, then we can't make sure whether that the
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// reason of no showing sound indicator is because of silent web audio, or
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// because the indicator is just not showing yet.
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await new Promise(r => setTimeout(r, 1000));
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await waitForTabPlayingEvent(tab, false);
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info(`- remove tab -`);
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await BrowserTestUtils.removeTab(tab);
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});
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