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2026-09-14 23:34:36 +08:00
parent a26bbecbd1
commit 1e893db246
5 changed files with 631 additions and 0 deletions
@@ -0,0 +1,98 @@
+export class StorySpeechNarrator {
+  private synth: SpeechSynthesis | null = null;
+  private currentUtterance: SpeechSynthesisUtterance | null = null;
+  private onEndCallback: (() => void) | null = null;
+  private onWordCallback: ((wordIndex: number) => void) | null = null;
+
+  constructor() {
+    if (typeof window !== 'undefined' && 'speechSynthesis' in window) {
+      this.synth = window.speechSynthesis;
+    }
+  }
+
+  public isAvailable(): boolean {
+    return this.synth !== null;
+  }
+
+  public speak(
+    text: string,
+    options?: {
+      rate?: number;
+      pitch?: number;
+      onEnd?: () => void;
+      onWord?: (index: number) => void;
+    }
+  ) {
+    if (!this.synth) return;
+    this.stop();
+
+    const utterance = new SpeechSynthesisUtterance(text);
+    utterance.rate = options?.rate ?? 0.9; // Slightly slower for children's story cadence
+    utterance.pitch = options?.pitch ?? 1.05; // Slightly warmer/friendly pitch
+
+    // Find warm friendly voice
+    const voices = this.synth.getVoices();
+    const naturalVoice = voices.find(v => 
+      v.lang.startsWith('en') && 
+      (v.name.includes('Natural') || v.name.includes('Samantha') || v.name.includes('Karen') || v.name.includes('Daniel') || v.name.includes('Google'))
+    ) || voices.find(v => v.lang.startsWith('en'));
+
+    if (naturalVoice) {
+      utterance.voice = naturalVoice;
+    }
+
+    this.onEndCallback = options?.onEnd || null;
+    this.onWordCallback = options?.onWord || null;
+
+    utterance.onend = () => {
+      this.currentUtterance = null;
+      if (this.onEndCallback) this.onEndCallback();
+    };
+
+    utterance.onerror = () => {
+      this.currentUtterance = null;
+      if (this.onEndCallback) this.onEndCallback();
+    };
+
+    let wordCount = 0;
+    utterance.onboundary = (e) => {
+      if (e.name === 'word') {
+        if (this.onWordCallback) {
+          this.onWordCallback(wordCount);
+        }
+        wordCount++;
+      }
+    };
+
+    this.currentUtterance = utterance;
+    this.synth.speak(utterance);
+  }
+
+  public stop() {
+    if (!this.synth) return;
+    this.synth.cancel();
+    this.currentUtterance = null;
+  }
+
+  public pause() {
+    if (this.synth) {
+      this.synth.pause();
+    }
+  }
+
+  public resume() {
+    if (this.synth) {
+      this.synth.resume();
+    }
+  }
+
+  public isSpeaking(): boolean {
+    return this.synth ? this.synth.speaking : false;
+  }
+
+  public getCurrentUtterance(): SpeechSynthesisUtterance | null {
+    return this.currentUtterance;
+  }
+}
+
+export const speechNarrator = new StorySpeechNarrator();