45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
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// Alarma corta generada con Web Audio (sin ficheros). Dos pitidos rápidos.
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let ctx: AudioContext | null = null;
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export function playAlarm() {
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try {
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const Ctor = window.AudioContext || (window as unknown as { webkitAudioContext: typeof AudioContext }).webkitAudioContext;
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ctx = ctx ?? new Ctor();
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if (ctx.state === "suspended") void ctx.resume();
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const now = ctx.currentTime;
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for (let i = 0; i < 2; i++) {
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const osc = ctx.createOscillator();
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const gain = ctx.createGain();
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osc.type = "square";
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osc.frequency.value = 880;
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const t = now + i * 0.18;
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gain.gain.setValueAtTime(0.0001, t);
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gain.gain.exponentialRampToValueAtTime(0.25, t + 0.01);
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gain.gain.exponentialRampToValueAtTime(0.0001, t + 0.15);
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osc.connect(gain);
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gain.connect(ctx.destination);
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osc.start(t);
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osc.stop(t + 0.16);
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}
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} catch {
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// sin audio disponible: ignoramos
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}
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}
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// Parsea "mm", "mm:ss" o "m.5" a segundos. Devuelve null si no es válido.
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export function parseTime(input: string): number | null {
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const s = input.trim();
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if (!s) return null;
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if (s.includes(":")) {
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const [m, sec] = s.split(":");
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const mm = Number(m);
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const ss = Number(sec);
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if (!Number.isFinite(mm) || !Number.isFinite(ss) || ss < 0 || ss >= 60) return null;
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const total = Math.round(mm * 60 + ss);
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return total > 0 ? total : null;
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}
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const mins = Number(s);
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if (!Number.isFinite(mins) || mins <= 0) return null;
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return Math.round(mins * 60);
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}
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