BLTH
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andywang425
禁止在页面不可见时切换画质
描述
B站最近更新了一个特性，通过监听 visibilitychange 事件，在页面切换至不可见状态（document.visibilityState === "hidden"）超过30秒后，自动把直播画质降到最低档，页面切换至可见状态时恢复原画质。此行为会导致画质切换时的音频卡顿，影响观看体验。希望能增加禁止在页面不可见时切换画质的功能。
脚本地址：https://s1.hdslb.com/bfs/static/blive/blfe-live-room/static/js/179.cef10c62090003b387b5.js
相关代码摘录如下：
...
this.visibilityChange = function() {
var e, n;
try {
"hidden" === document.visibilityState ? ((null === (e = t.playInfo()) || void 0 === e ? void 0 : e.playingStatus) && t.beginCountDown(),
(0,
Ve.nO)("live_room_visibility_quality_change_hidden", {
visibilityState: document.visibilityState,
playingStatus: null === (n = t.playInfo()) || void 0 === n ? void 0 : n.playingStatus
}, "custom", 0)) : (t.clearCountDown(),
a()(t.currentQuality).length && t.switchToFrontend())
} catch (t) {
console.warn("handleVisibilityChange error:", t)
}
}
,
this.beginCountDown = function() {
t.clearCountDown(),
t.timer = setInterval((function() {
t.maxCountDown > 0 ? t.maxCountDown-- : (t.clearCountDown(),
t.switchToBackend())
}
), 1e3)
}
,
this.clearCountDown = function() {
t.timer && (t.maxCountDown = 30,
clearInterval(t.timer))
}
...
