4c:I[707087,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/2rwy6tq861e-y.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/2hlz_ivp-qrnh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2zoahorp76dll.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1d0aij627lbx2.js","/_next/static/immutable/chunks/1ud4fi_ghnsx-.js"],"RegistryDependencies"] 4d:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/2rwy6tq861e-y.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/2hlz_ivp-qrnh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2zoahorp76dll.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1d0aij627lbx2.js","/_next/static/immutable/chunks/1ud4fi_ghnsx-.js"],"FilesView"] 4e:T1f41,"use client" import * as React from "react" import { Mic, Square } from "lucide-react" import { cn } from "@/lib/utils" export type MicSelectorStatus = "unsupported" | "idle" | "requesting" | "testing" | "denied" | "error" export type MicSelectorProps = Omit< React.HTMLAttributes, "onChange" | "onError" | "children" > & { /** The chosen device, when you hold the value yourself. */ value?: string defaultValue?: string onValueChange?: (deviceId: string) => void onStatusChange?: (status: MicSelectorStatus) => void /** Segments in the level meter. */ segments?: number label?: string disabled?: boolean } const SEGMENTS = 12 const noop = () => () => {} function canEnumerate() { return Boolean(navigator.mediaDevices?.enumerateDevices) } /** * Picks which microphone to use, and answers the question that follows it by * lighting a meter from the one you chose. * * Device labels are withheld until a page has been granted the microphone * once, so an untested list reads "Microphone 1, Microphone 2" and fills in * with real names as soon as the test is run. */ export function MicSelector({ value, defaultValue = "", onValueChange, onStatusChange, segments = SEGMENTS, label = "Microphone", disabled = false, className, ...rootProps }: MicSelectorProps) { const [devices, setDevices] = React.useState([]) const [chosen, setChosen] = React.useState(defaultValue) const [status, setStatus] = React.useState("idle") const [level, setLevel] = React.useState(0) const deviceId = React.useId() const session = React.useRef<{ stream: MediaStream audio: AudioContext frame: number } | null>(null) const supported = React.useSyncExternalStore(noop, canEnumerate, () => true) const shown: MicSelectorStatus = supported ? status : "unsupported" const selected = value ?? chosen const testing = shown === "testing" const announce = React.useCallback( (next: MicSelectorStatus) => { setStatus(next) onStatusChange?.(next) }, [onStatusChange] ) const list = React.useCallback(() => { if (!canEnumerate()) return navigator.mediaDevices .enumerateDevices() .then((found) => setDevices(found.filter((device) => device.kind === "audioinput")) ) .catch(() => {}) }, []) React.useEffect(() => { list() if (!navigator.mediaDevices?.addEventListener) return const sync = () => list() navigator.mediaDevices.addEventListener("devicechange", sync) return () => navigator.mediaDevices.removeEventListener("devicechange", sync) }, [list]) const release = React.useCallback(() => { const current = session.current if (!current) return session.current = null cancelAnimationFrame(current.frame) for (const track of current.stream.getTracks()) track.stop() void current.audio.close().catch(() => {}) setLevel(0) }, []) React.useEffect(() => release, [release]) const test = React.useCallback(async () => { if (session.current) return announce("requesting") let stream: MediaStream try { stream = await navigator.mediaDevices.getUserMedia({ audio: selected ? { deviceId: { exact: selected } } : true, }) } catch (error) { announce( (error as DOMException)?.name === "NotAllowedError" ? "denied" : "error" ) return } try { const audio = new AudioContext() const analyser = audio.createAnalyser() analyser.fftSize = 512 audio.createMediaStreamSource(stream).connect(analyser) const data = new Uint8Array(analyser.frequencyBinCount) const read = () => { if (!session.current) return analyser.getByteTimeDomainData(data) let sum = 0 for (const sample of data) sum += ((sample - 128) / 128) ** 2 setLevel(Math.min(1, Math.sqrt(sum / data.length) * 2.5)) session.current.frame = requestAnimationFrame(read) } session.current = { stream, audio, frame: 0 } session.current.frame = requestAnimationFrame(read) // Permission is what unlocks the real device names. list() announce("testing") } catch { for (const track of stream.getTracks()) track.stop() announce("error") } }, [announce, list, selected]) const choose = (deviceId: string) => { release() if (status === "testing") announce("idle") if (value === undefined) setChosen(deviceId) onValueChange?.(deviceId) } const message: Record = { unsupported: "This browser cannot list audio devices.", idle: "Test to check the microphone is picking you up.", requesting: "Waiting for permission to use the microphone.", testing: "Testing. Speak, and the meter should move.", denied: "Microphone permission was refused.", error: "The microphone could not be started.", } const lit = Math.round(level * segments) return (

{label}

{/* The live region below carries the same words, so this is the visible half of one message rather than a second one. */} {message[shown]}

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