82 lines
2.1 KiB
TypeScript
82 lines
2.1 KiB
TypeScript
import { useStore } from './store'
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let ctx: AudioContext | null = null
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function getCtx(): AudioContext | null {
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if (ctx && ctx.state !== 'closed') return ctx
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try { ctx = new AudioContext() } catch { return null }
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return ctx
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}
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function isSoundEnabled(): boolean {
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return useStore.getState().narratorSettings.sounds
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}
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function tone(freq: number, duration: number, type: OscillatorType = 'sine', gain = 0.15) {
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if (!isSoundEnabled()) return
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const ac = getCtx()
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if (!ac) return
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if (ac.state === 'suspended') ac.resume()
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const osc = ac.createOscillator()
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const g = ac.createGain()
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osc.type = type
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osc.frequency.value = freq
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g.gain.value = gain
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g.gain.exponentialRampToValueAtTime(0.001, ac.currentTime + duration / 1000)
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osc.connect(g).connect(ac.destination)
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osc.start()
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osc.stop(ac.currentTime + duration / 1000)
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}
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export function playKeyClick() {
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tone(1200, 50, 'sine', 0.08)
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}
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export function playDelete() {
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tone(400, 50, 'sine', 0.08)
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}
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export function playComplete() {
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if (!isSoundEnabled()) return
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const ac = getCtx()
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if (!ac) return
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if (ac.state === 'suspended') ac.resume()
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const notes = [523, 659, 784]
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notes.forEach((freq, i) => {
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const osc = ac.createOscillator()
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const g = ac.createGain()
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osc.type = 'sine'
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osc.frequency.value = freq
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g.gain.value = 0.15
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const start = ac.currentTime + i * 0.1
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g.gain.exponentialRampToValueAtTime(0.001, start + 0.15)
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osc.connect(g).connect(ac.destination)
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osc.start(start)
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osc.stop(start + 0.15)
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})
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}
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export function playHint() {
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tone(660, 100, 'sine', 0.1)
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}
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export function playWordComplete() {
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if (!isSoundEnabled()) return
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const ac = getCtx()
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if (!ac) return
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if (ac.state === 'suspended') ac.resume()
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const notes = [587, 784]
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notes.forEach((freq, i) => {
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const osc = ac.createOscillator()
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const g = ac.createGain()
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osc.type = 'sine'
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osc.frequency.value = freq
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g.gain.value = 0.12
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const start = ac.currentTime + i * 0.1
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g.gain.exponentialRampToValueAtTime(0.001, start + 0.12)
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osc.connect(g).connect(ac.destination)
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osc.start(start)
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osc.stop(start + 0.12)
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})
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}
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