# 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 bandpass filter with adjustable `lowFreq` and `highFreq`.
- ✅ 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+)
- [NuGetForUnity](https://github.com/GlitchEnzo/NuGetForUnity) plugin for package management
- A WebSocket server (see below)

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## 📦 Dependencies (via NuGet)

### 1. Install NuGetForUnity

1. Download the latest `.unitypackage` from [NuGetForUnity Releases](https://github.com/GlitchEnzo/NuGetForUnity/releases)
2. Import it into your Unity project (`Assets → Import Package → Custom Package`)
3. A new **NuGet** menu will appear in the Unity toolbar.

### 2. Install Required Packages

Use the **NuGet → Manage NuGet Packages** menu and search for:

- `Concentus` (e.g., `Concentus.Oggfile` or `Concentus` by `lostromb`)

Once installed, Unity will generate `.csproj` references for you.

> ✅ No need to manually copy DLLs!

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## Project Structure

### 🎙️ `OpusMicRecorder.cs`
Captures microphone audio, filters it, and encodes using Opus.

### 📤 `OpusVoiceSender.cs`
Sends encoded voice packets to a WebSocket server.

### 📥 `OpusVoiceReceiverWithBuffer.cs`
Receives Opus packets, decodes them, and streams via `AudioSource`.

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## 🔌 WebSocket Server

You can use a simple WebSocket server for voice routing. Here’s a Python example:

```bash
pip install websockets