92 lines
2.6 KiB
Svelte
92 lines
2.6 KiB
Svelte
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<script lang="ts">
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import cx from "classnames"
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import Microphone from "@assets/icons/microphone.svg?dataurl"
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import Icon from "@lib/components/Icon.svelte"
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type Props = {
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track: MediaStreamTrack | undefined
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error?: string
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offMessage?: string
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}
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const {track, error, offMessage = "Microphone is off"}: Props = $props()
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let level = $state(0)
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$effect(() => {
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const t = track
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level = 0
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if (!t || error) return
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let frame: number | undefined
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const context = new AudioContext()
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const analyser = context.createAnalyser()
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analyser.fftSize = 512
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context.createMediaStreamSource(new MediaStream([t])).connect(analyser)
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const data = new Uint8Array(analyser.frequencyBinCount)
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// Smooth into a plain local, not into `level` itself: reading the `$state`
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// we also write would make this effect depend on its own output, so every
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// frame would invalidate and re-run it, tearing down the AudioContext
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// before it ever produced a reading.
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let smoothed = 0
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const tick = () => {
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if (!t.enabled || t.readyState !== "live") {
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smoothed = 0
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level = 0
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frame = requestAnimationFrame(tick)
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return
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}
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analyser.getByteTimeDomainData(data)
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let sumSquares = 0
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for (const v of data) {
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const normalized = (v - 128) / 128
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sumSquares += normalized * normalized
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}
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const rms = Math.sqrt(sumSquares / data.length)
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const NOISE_FLOOR = 0.03
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const gated = rms < NOISE_FLOOR ? 0 : (rms - NOISE_FLOOR) / (1 - NOISE_FLOOR)
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smoothed += (Math.min(1, gated * 4) - smoothed) * 0.5
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if (smoothed < 0.005) smoothed = 0
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level = smoothed
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frame = requestAnimationFrame(tick)
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}
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tick()
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return () => {
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if (frame !== undefined) cancelAnimationFrame(frame)
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context.close().catch(() => {})
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}
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})
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</script>
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<div class="flex items-center gap-2">
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<Icon icon={Microphone} size={4} class="shrink-0 opacity-70" />
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{#if error}
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<p class="text-xs text-error" role="alert">{error}</p>
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{:else if !track}
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<p class="text-xs opacity-60">{offMessage}</p>
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{:else}
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<div
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class="flex flex-1 items-center gap-1"
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role="meter"
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aria-label="Microphone input level"
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aria-valuemin={0}
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aria-valuemax={100}
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aria-valuenow={Math.round(level * 100)}>
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{#each Array(5) as _, i (i)}
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<div
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class={cx(
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"h-2 flex-1 rounded-full transition-colors",
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level * 5 > i ? "bg-success" : "bg-surface-more",
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)}>
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</div>
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{/each}
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</div>
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<span class="shrink-0 text-xs opacity-60">Speak to test</span>
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{/if}
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</div>
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