1. const WebSocket = require('ws');
2. const fs = require('fs');
3. const path = require('path');
4.  
5. // Define the output file path
6. const outputFilePath = path.join(__dirname, 'received_stereo_audio.raw');
7.  
8. // Create a writable stream to the output file
9. const writeStream = fs.createWriteStream(outputFilePath, { flags: 'w' }); // 'a' flag for appending
10.  
11. // Create a WebSocket server
12. const wss = new WebSocket.Server({ port: 8080 });
13.  
14. wss.on('connection', (ws) => {
15.     console.log('Client connected');
16.  
17.     ws.on('message', (message) => {
18.         // We expect binary data (ArrayBuffer)
19.         if (typeof message === 'object' && message instanceof Buffer) {
20.             // Write the received data directly to the file
21.             writeStream.write(message);
22.             console.log(`Received ${message.length} bytes of stereo audio data and wrote to file`);
23.         }
24.     });
25.  
26.     ws.on('close', () => {
27.         console.log('Client disconnected');
28.     });
29. });
30.  
31. // Handle server close to properly close the file stream
32. wss.on('close', () => {
33.     writeStream.end(); // Close the file stream
34.     console.log('WebSocket server closed, file stream ended');
35. });
36.  
37. console.log('WebSocket server is listening on ws://localhost:8080');
38.