Initial commit

services/tts.ts

@@ -0,0 +1,40 @@
+import fs from "fs";
+import path from "path";
+import {
+  PollyClient,
+  SynthesizeSpeechCommand,
+} from "@aws-sdk/client-polly";
+
+const polly = new PollyClient({ region: "ap-northeast-1" });
+
+export async function generateTTS(
+  itemId: string,
+  scriptText: string
+): Promise<string> {
+  const params = {
+    OutputFormat: "mp3",
+    Text: scriptText,
+    VoiceId: "Mizuki",
+    LanguageCode: "ja-JP",
+  };
+  const command = new SynthesizeSpeechCommand(params);
+  const response = await polly.send(command);
+
+  if (!response.AudioStream) {
+    throw new Error("TTSのAudioStreamが空です");
+  }
+
+  const outputDir = path.join(__dirname, "../static/podcast_audio");
+  if (!fs.existsSync(outputDir)) {
+    fs.mkdirSync(outputDir, { recursive: true });
+  }
+  const filePath = path.join(outputDir, \`\${itemId}.mp3\`);
+
+  const chunks: Uint8Array[] = [];
+  for await (const chunk of response.AudioStream as any) {
+    chunks.push(chunk);
+  }
+  const buffer = Buffer.concat(chunks);
+  fs.writeFileSync(filePath, buffer);
+  return filePath;
+}