Unity Socket Voice Chat Example 🎙️

This Unity project demonstrates a real-time voice chat system using:

• 🎧 Microphone input with Opus codec (via Concentus)
• 🔊 Dynamic bandpass audio filtering
• 📡 WebSocket communication (via WebSocketSharp)
• 🎮 Unity AudioSource streaming with a circular buffer

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Features

• ✅ Record microphone audio in real time.
• ✅ Apply a tunable bandpass filter to remove noise and improve voice clarity.
• ✅ Encode audio using Opus codec for low-latency transmission.
• ✅ Transmit voice data over a WebSocket connection.
• ✅ Decode and playback received voice with a continuous audio stream.

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Setup

🔧 Requirements

• Unity 2020.3 or newer (tested on Unity 2021+)
• WebSocketSharp library
• Concentus Opus codec for C#
• A WebSocket server (you can use a basic Python or Node.js echo server for testing)

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Project Structure

🎙️ OpusMicRecorder.cs

• Captures microphone audio.
• Applies a bandpass filter with adjustable lowFreq and highFreq.
• Encodes audio using Opus (20ms frame).
• Sends encoded data through OnEncodedAudio event.

📤 OpusVoiceSender.cs

• Connects to a WebSocket server.
• Listens for encoded audio from OpusMicRecorder.
• Sends voice packets via WebSocket.

📥 OpusVoiceReceiverWithBuffer.cs

• Connects to the same WebSocket server.
• Receives encoded Opus packets.
• Decodes them into PCM audio.
• Buffers the audio into a ring buffer for continuous playback using an AudioSource.

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Usage Instructions

1. Add Required Libraries

• Import WebSocketSharp.dll into your Unity project.
• Add the Concentus library (via Unity Package Manager or DLL).

2. Setup Scene

• Create an empty GameObject in your scene.
• Attach:
  • OpusMicRecorder
  • OpusVoiceSender
  • OpusVoiceReceiverWithBuffer