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discord.jsで音声合成機能を作る

Last updated at Posted at 2021-03-27

今回つくるもの

1.discord 上で読み上げるテキストを指定するコマンドを実行
2.メッセージから読みあげたいテキストを取得
3.Google の TTSAPI にリクエスト送信
4.結果を取得
5.1が送信されたチャンネルに結果を送信

必要なもの

・@replit/node-fetch(npm i @replit/node-fetch)
・stream(npm i stream)
・util(npm i util)
・discord.js(npm i discord.js);
discord.js の実行環境の整備は、ここでは省きます。

コード

const prefix = "!";
const discord = require("discord.js");
const { createWriteStream } = require("fs");
const { pipeline } = require("stream");
const { promisify } = require("util");
const fetch = require("@replit/node-fetch");
const client = new discord.Client({
  intents: [
    discord.GatewayIntentBits.Guilds,
    discord.GatewayIntentBits.GuildMessages,
    discord.GatewayIntentBits.MessageContent,
  ],
});

client.on(discord.Events.MessageCreate, async (message) => {
  if (message.author.bot) return;
  const args = message.content.slice(prefix.length).trim().split(/ +/g);
  const command = args.shift().toLowerCase();
  if (command == "voicetext") {
    const t = args.join(" ");
    const m = Math.random().toString(36).slice(2, 12);
    const streamPipeline = promisify(pipeline);

    const response = await fetch(
      `https://www.google.com/speech-api/v1/synthesize?text=${encodeURI(
        t
      )}&nc=mpeg&lang=ja&speed=0.5&client=lr-language-tts`
    );

    if (!response.ok)
      throw new Error(`unexpected response ${response.statusText}`);

    await streamPipeline(response.body, createWriteStream(`./voices/${m}.mp3`));
    message.channel.send({ content: "結果:", files: [`voices/${m}.mp3`] });
  }
});
client.login("token");

結果

!voicetext <text>を実行すると、音声合成した結果が返ってきます!
スクリーンショット 2021-03-27 174757.png

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