ボイチャを音声として取得できるようになった

.gitattributes

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+* text eol=lf

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/node
+# Edit at https://www.toptal.com/developers/gitignore?templates=node
+
+### Node ###
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Dockerfile

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+# ベースイメージ
+FROM node:18
+
+# ffmpegをインストール
+RUN apt-get update && apt-get install -y ffmpeg
+
+# 作業ディレクトリの設定
+WORKDIR /usr/src/app
+
+# package.json と package-lock.json をコピーしてインストール
+COPY package*.json ./
+RUN npm install
+
+# bot.jsと他の必要なファイルをコンテナにコピー
+COPY . .
+
+# Botを実行
+CMD [ "node", "bot.js" ]

bot.js

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+const sodium = require('libsodium-wrappers');
+const { Client, GatewayIntentBits } = require('discord.js');
+const { joinVoiceChannel, getVoiceConnection, VoiceConnectionStatus, EndBehaviorType, createAudioPlayer, createAudioResource, VoiceReceiver } = require('@discordjs/voice');
+const fs = require('fs');
+const { pipeline } = require('stream');
+const { OpusEncoder } = require('@discordjs/opus'); // Opusデコーダーをインポート
+const { exec } = require('child_process');
+
+sodium.ready.then(() => {
+    console.log('Sodium library loaded!');
+});
+
+const client = new Client({
+    intents: [
+        GatewayIntentBits.Guilds,
+        GatewayIntentBits.GuildVoiceStates,
+        GatewayIntentBits.GuildMessages,
+        GatewayIntentBits.MessageContent,
+    ],
+});
+
+client.once('ready', () => {
+    console.log('Bot is ready!');
+});
+
+client.on('messageCreate', async message => {
+    if (message.content === '!join') {
+        if (message.member.voice.channel) {
+            const connection = joinVoiceChannel({
+                channelId: message.member.voice.channel.id,
+                guildId: message.guild.id,
+                adapterCreator: message.guild.voiceAdapterCreator,
+                selfDeaf: false,
+                selfMute: false,
+            });
+
+            connection.on(VoiceConnectionStatus.Ready, () => {
+                console.log('Bot has connected to the channel!');
+                startRecording(connection, message.member.voice.channel);
+            });
+        } else {
+            message.reply('ボイスチャンネルに接続してください。');
+        }
+    }
+
+    if (message.content === '!leave') {
+        const connection = getVoiceConnection(message.guild.id);
+        if (connection) {
+            connection.destroy();
+            message.reply('ボイスチャンネルを離れました。');
+        } else {
+            message.reply('ボイスチャンネルに接続していません。');
+        }
+    }
+});
+
+function startRecording(connection, voiceChannel) {
+    const receiver = connection.receiver;
+    const activeStreams = new Map(); // ユーザーごとの音声ストリーム管理
+
+    receiver.speaking.on('start', (userId) => {
+        const user = voiceChannel.members.get(userId);
+        if (!user) {
+            console.error('User is undefined');
+            return;
+        }
+
+        console.log(`Started receiving audio from user: ${user.id}`);
+
+        // すでに音声ストリームが存在する場合はスキップ
+        if (activeStreams.has(user.id)) {
+            return;
+        }
+
+        const audioStream = receiver.subscribe(user.id, {
+            end: EndBehaviorType.Manual
+        });
+
+        const filePath = `./recordings/${user.id}-${Date.now()}.pcm`;
+        const writableStream = fs.createWriteStream(filePath);
+        activeStreams.set(user.id, { audioStream, writableStream, filePath });
+
+        // OpusデータをデコードしてPCMデータとして書き込む
+        const opusDecoder = new OpusEncoder(48000, 2); // Opusデコーダーを使用
+        audioStream.on('data', (chunk) => {
+            try {
+                const pcmData = opusDecoder.decode(chunk);
+                writableStream.write(pcmData);
+                console.log(`Received ${chunk.length} bytes of audio data from user ${user.id}`);
+            } catch (err) {
+                console.error('Error decoding audio chunk:', err);
+            }
+        });
+
+        // エラーハンドリング
+        audioStream.on('error', (err) => {
+            console.error('Error in the audio stream:', err);
+        });
+    });
+
+    receiver.speaking.on('end', (userId) => {
+        const streamData = activeStreams.get(userId);
+        if (!streamData) {
+            return;
+        }
+
+        const { writableStream, filePath } = streamData;
+
+        // ストリームを終了し、ファイルを書き込み完了後に変換
+        writableStream.end(() => {
+            console.log(`Recording saved to ${filePath}`);
+            activeStreams.delete(userId);
+
+            // ファイルが空でないことを確認してから変換
+            fs.stat(filePath, (err, stats) => {
+                if (err) {
+                    console.error('Error checking file:', err);
+                    return;
+                }
+                if (stats.size > 0) {
+                    convertToWavInBackground(filePath);  // バックグラウンドで変換を実行
+                } else {
+                    console.log(`File ${filePath} is empty, skipping conversion.`);
+                    fs.unlinkSync(filePath); // 空のファイルを削除
+                }
+            });
+        });
+    });
+}
+
+function convertToWavInBackground(pcmPath) {
+    const wavPath = pcmPath.replace('.pcm', '.wav');
+    console.log(`Converting ${pcmPath} to ${wavPath} in the background`);
+
+    // バックグラウンドで変換を実行
+    exec(`ffmpeg -f s16le -ar 48000 -ac 2 -i ${pcmPath} ${wavPath}`, (error, stdout, stderr) => {
+        if (error) {
+            console.error(`Error during conversion: ${error.message}`);
+            return;
+        }
+        if (stderr) {
+            console.error(`FFmpeg stderr: ${stderr}`);
+            return;
+        }
+
+        // 変換が成功したらPCMファイルを削除
+        console.log(`Successfully converted ${pcmPath} to ${wavPath}`);
+        fs.unlink(pcmPath, (unlinkError) => {
+            if (unlinkError) {
+                console.error(`Error deleting PCM file: ${unlinkError.message}`);
+            } else {
+                console.log(`Deleted PCM file: ${pcmPath}`);
+            }
+        });
+    });
+}
+
+client.login(process.env.TOKEN);

docker-compose.yml

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+version: '3'
+services:
+  discord-bot:
+    build: .
+    container_name: discord-voice-bot
+    environment:
+      - TOKEN=MTI0MDY1MDc3NTE2MDY4NDU1NA.Gl_Z2X.SBWCjk3OzIViNbSXocoPBt_817BZQ12fONLVSY
+    volumes:
+      - ./recordings:/usr/src/app/recordings

package.json

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+{
+    "name": "discord-voice-bot",
+    "version": "1.0.0",
+    "description": "Discord bot to record voice and convert to wav",
+    "main": "bot.js",
+    "dependencies": {
+        "@discordjs/opus": "^0.5.3",
+        "@discordjs/voice": "^0.14.0",
+        "discord.js": "^14.16.1",
+        "ffmpeg-static": "^4.4.1",
+        "libsodium-wrappers": "^0.7.10"
+    },
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC"
+}