Zhicheng Han
69 lines
1.8 KiB
TypeScript
69 lines
1.8 KiB
TypeScript
type AudioContextConstructor = typeof AudioContext
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type WindowWithWebkitAudio = Window & typeof globalThis & {
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webkitAudioContext?: AudioContextConstructor
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}
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let audioContext: AudioContext | null = null
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function getAudioContext(): AudioContext | null {
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if (typeof window === 'undefined') return null
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const AudioContextCtor = window.AudioContext || (window as WindowWithWebkitAudio).webkitAudioContext
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if (!AudioContextCtor) return null
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if (!audioContext) {
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audioContext = new AudioContextCtor()
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}
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return audioContext
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}
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export function primeCompletionSound(): void {
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const ctx = getAudioContext()
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if (!ctx || ctx.state !== 'suspended') return
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void ctx.resume().catch(() => {
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// Browser autoplay policy may still reject until a user gesture. Ignore; the
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// next send action will try again.
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})
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}
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export async function playCompletionSound(): Promise<boolean> {
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const ctx = getAudioContext()
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if (!ctx) return false
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try {
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if (ctx.state === 'suspended') {
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await ctx.resume()
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}
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const now = ctx.currentTime
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const duration = 0.16
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const oscillator = ctx.createOscillator()
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const gain = ctx.createGain()
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oscillator.type = 'sine'
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oscillator.frequency.setValueAtTime(880, now)
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oscillator.frequency.exponentialRampToValueAtTime(660, now + duration)
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gain.gain.setValueAtTime(0.0001, now)
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gain.gain.exponentialRampToValueAtTime(0.18, now + 0.015)
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gain.gain.exponentialRampToValueAtTime(0.0001, now + duration)
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oscillator.connect(gain)
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gain.connect(ctx.destination)
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oscillator.start(now)
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oscillator.stop(now + duration)
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return true
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} catch (err) {
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console.warn('Failed to play completion sound:', err)
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return false
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}
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}
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export function __resetCompletionSoundForTests(): void {
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audioContext = null
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}
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