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2026-04-18 23:11:35 +02:00
commit f7cfd2a86e
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+// One-shot call sound effects via WebAudio. Generated on the fly so no
+// binary assets needed. Intentionally short + low-volume — these fire
+// multiple times per call and shouldn't feel intrusive.
+
+type Sfx = 'join' | 'leave' | 'end';
+
+let ctx: AudioContext | null = null;
+
+function getCtx(): AudioContext | null {
+  if (ctx) return ctx;
+  const AudioCtx =
+    window.AudioContext ??
+    (window as unknown as { webkitAudioContext?: typeof AudioContext }).webkitAudioContext;
+  if (!AudioCtx) return null;
+  ctx = new AudioCtx();
+  return ctx;
+}
+
+function beep(freq: number, durationSec: number, delaySec: number, gain = 0.15): void {
+  const c = getCtx();
+  if (!c) return;
+  const osc = c.createOscillator();
+  const g = c.createGain();
+  osc.type = 'sine';
+  osc.frequency.value = freq;
+  osc.connect(g);
+  g.connect(c.destination);
+  const t0 = c.currentTime + delaySec;
+  g.gain.setValueAtTime(0, t0);
+  g.gain.linearRampToValueAtTime(gain, t0 + 0.02);
+  g.gain.exponentialRampToValueAtTime(0.001, t0 + durationSec);
+  osc.start(t0);
+  osc.stop(t0 + durationSec + 0.02);
+}
+
+export async function playSfx(kind: Sfx): Promise<void> {
+  const c = getCtx();
+  if (!c) return;
+  if (c.state === 'suspended') {
+    try {
+      await c.resume();
+    } catch {
+      /* ignore */
+    }
+  }
+  switch (kind) {
+    case 'join':
+      // Rising two-note chirp — someone entered.
+      beep(523.25, 0.12, 0, 0.16); // C5
+      beep(783.99, 0.18, 0.1, 0.16); // G5
+      break;
+    case 'leave':
+      // Falling two-note — someone left.
+      beep(659.25, 0.12, 0, 0.14); // E5
+      beep(329.63, 0.18, 0.1, 0.14); // E4
+      break;
+    case 'end':
+      // Soft descending thud — call ended.
+      beep(440, 0.18, 0, 0.14); // A4
+      beep(293.66, 0.26, 0.14, 0.14); // D4
+      break;
+  }
+}
+
+export function playJoinBeep(): Promise<void> {
+  return playSfx('join');
+}
+export function playLeaveBeep(): Promise<void> {
+  return playSfx('leave');
+}
+export function playEndBeep(): Promise<void> {
+  return playSfx('end');
+}