migrate to root dir

lib/pipeline/tts.ts

@@ -0,0 +1,47 @@
+import OpenAI from "openai";
+import * as fs from "fs";
+import * as path from "path";
+import { StoryConfig } from "./config";
+
+let openaiClient: OpenAI | null = null;
+function getOpenAI(): OpenAI {
+  if (!openaiClient) {
+    openaiClient = new OpenAI({ apiKey: process.env.OPENAI_API_KEY });
+  }
+  return openaiClient;
+}
+
+export async function generateAudio(
+  storyConfig: StoryConfig,
+  storyName: string,
+  chunk: string,
+  index: number
+): Promise<string> {
+  const speechFile = path.join("stories", storyName, "audio", `chunk_${index}.mp3`);
+
+  const mp3 = await getOpenAI().audio.speech.create({
+    model: "gpt-4o-mini-tts",
+    voice: storyConfig.config.tts_voice_id as unknown as string,
+    input: chunk,
+    instructions: storyConfig.config.tts_instructions,
+  });
+
+  const buffer = Buffer.from(await mp3.arrayBuffer());
+  await fs.promises.writeFile(speechFile, buffer);
+
+  return speechFile;
+}
+
+export async function generateSingleAudio(storyConfig: StoryConfig, text: string, outputFile: string): Promise<string> {
+  const mp3 = await getOpenAI().audio.speech.create({
+    model: "gpt-4o-mini-tts",
+    voice: storyConfig.config.tts_voice_id as unknown as string,
+    input: text,
+    instructions: storyConfig.config.tts_instructions,
+  });
+
+  const buffer = Buffer.from(await mp3.arrayBuffer());
+  await fs.promises.writeFile(outputFile, buffer);
+
+  return outputFile;
+}