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const PAGE_NON_AUTOPLAY =
"https://example.com/browser/dom/media/mediacontrol/tests/browser/file_non_autoplay.html";
const VIDEO_ID = "video";
add_task(async function setupTestingPref() {
await SpecialPowers.pushPrefEnv({
set: [
["media.mediacontrol.testingevents.enabled", true],
["dom.suspend_inactive.enabled", true],
["dom.audiocontext.testing", true],
],
});
});
/**
* This test to used to test the feature that would suspend the inactive tab,
* which currently is only used on Android.
*
* Normally when tab becomes inactive, we would suspend it and stop its script
* from running. However, if a tab has a main controller, which indicates it
* might have playng media, or waiting media keys to control media, then it
* would not be suspended event if it's inactive.
*
* In addition, Note that, on Android, audio focus management is enabled by
* default, so there is only one tab being able to play at a time, which means
* the tab playing media always has main controller.
*/
add_task(async function testInactiveTabWouldBeSuspended() {
info(`open a tab`);
const tab = await createTab(PAGE_NON_AUTOPLAY);
await shouldTabStateEqualTo(tab, "running");
info(`tab should be suspended when it becomes inactive`);
setTabActive(tab, false);
await shouldTabStateEqualTo(tab, "suspended");
info(`remove tab`);
await tab.close();
});
add_task(async function testInactiveTabEverStartPlayingWontBeSuspended() {
info(`open tab1 and play media`);
const tab1 = await createTab(PAGE_NON_AUTOPLAY, { needCheck: true });
await shouldTabStateEqualTo(tab1, "running");
await playMedia(tab1, VIDEO_ID);
info(`tab with playing media won't be suspended when it becomes inactive`);
setTabActive(tab1, false);
await shouldTabStateEqualTo(tab1, "running");
info(
`even if media is paused, keep tab running so that it could listen to media keys to control media in the future`
);
await pauseMedia(tab1, VIDEO_ID);
await shouldTabStateEqualTo(tab1, "running");
info(`open tab2 and play media`);
const tab2 = await createTab(PAGE_NON_AUTOPLAY, { needCheck: true });
await shouldTabStateEqualTo(tab2, "running");
await playMedia(tab2, VIDEO_ID);
info(
`as inactive tab1 doesn't own main controller, it should be suspended again`
);
await shouldTabStateEqualTo(tab1, "suspended");
info(`remove tabs`);
await Promise.all([tab1.close(), tab2.close()]);
});
/**
* The following are helper functions.
*/
async function createTab(url, needCheck = false) {
const tab = await createLoadedTabWrapper(url, { needCheck });
await createStateObserver(tab);
return tab;
}
function createStateObserver(tab) {
return SpecialPowers.spawn(tab.linkedBrowser, [], _ => {
/**
* Currently there is no API allowing us to observe tab's suspend state
* directly, so we use a tricky way to observe that by checking AudioContext
* state. Because AudioContext would change its state when tab is being
* suspended or resumed.
*/
class StateObserver {
constructor() {
this.ac = new content.AudioContext();
}
getState() {
return this.ac.state;
}
async waitUntilStateEqualTo(expectedState) {
while (this.ac.state != expectedState) {
info(`wait until tab state changes to '${expectedState}'`);
await new Promise(r => (this.ac.onstatechange = r));
}
}
}
content.obs = new StateObserver();
});
}
function setTabActive(tab, isActive) {
tab.linkedBrowser.docShellIsActive = isActive;
}
function shouldTabStateEqualTo(tab, state) {
return SpecialPowers.spawn(tab.linkedBrowser, [state], async state => {
await content.obs.waitUntilStateEqualTo(state);
ok(content.obs.getState() == state, `correct tab state '${state}'`);
});
}
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