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2026-04-18 23:11:35 +02:00
commit f7cfd2a86e
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+// Looping WebAudio ringtones. Two patterns:
+//   - outgoing: long calling tone, 3s cycle
+//   - incoming: classic "ring ring" double beep, 2s cycle
+
+type Pattern = 'outgoing' | 'incoming';
+
+class Ringtone {
+  private ctx: AudioContext | null = null;
+  private interval: number | null = null;
+  private pattern: Pattern | null = null;
+
+  start(pattern: Pattern): void {
+    if (this.pattern === pattern) return; // already playing this pattern
+    this.stop();
+    const AudioCtx =
+      window.AudioContext ??
+      (window as unknown as { webkitAudioContext?: typeof AudioContext }).webkitAudioContext;
+    if (!AudioCtx) return;
+    this.ctx = new AudioCtx();
+    this.pattern = pattern;
+
+    const play = pattern === 'outgoing' ? this.playOutgoing : this.playIncoming;
+    play.call(this);
+    this.interval = window.setInterval(
+      () => play.call(this),
+      pattern === 'outgoing' ? 3000 : 2000,
+    );
+  }
+
+  stop(): void {
+    if (this.interval !== null) {
+      window.clearInterval(this.interval);
+      this.interval = null;
+    }
+    if (this.ctx) {
+      void this.ctx.close().catch(() => {
+        /* ignore */
+      });
+      this.ctx = null;
+    }
+    this.pattern = null;
+  }
+
+  private beep(freq: number, durationSec: number, delaySec: number, gain = 0.18): void {
+    const ctx = this.ctx;
+    if (!ctx) return;
+    const osc = ctx.createOscillator();
+    const g = ctx.createGain();
+    osc.type = 'sine';
+    osc.frequency.value = freq;
+    osc.connect(g);
+    g.connect(ctx.destination);
+    const t0 = ctx.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);
+  }
+
+  private playOutgoing(): void {
+    // Soft calling tone — single warm note.
+    this.beep(440, 0.4, 0, 0.14);
+    this.beep(440, 0.4, 0.6, 0.14);
+  }
+
+  private playIncoming(): void {
+    // Classic double-ring "ring ring".
+    this.beep(880, 0.18, 0, 0.22);
+    this.beep(660, 0.18, 0.22, 0.22);
+    this.beep(880, 0.18, 0.6, 0.22);
+    this.beep(660, 0.18, 0.82, 0.22);
+  }
+}
+
+export const ringtone = new Ringtone();