PC-Audio-Stream-to-Phone

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PC-Audio-Stream-to-Phone

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Real-time, low-latency audio streaming from your Windows PC to an Android device.

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// repository documentation

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# PC Audio Stream to Phone (AS2P)

**PC Audio Stream to Phone (AS2P)** is a specialized, open-source solution for real-time, low-latency audio streaming from your Windows PC to an Android device.

## Security Notice

> This project should currently be treated as a prototype-grade implementation rather than a hardened production audio transport.
> Use it only on trusted networks, and do not assume the current pairing or network behavior is suitable for hostile or shared environments without additional hardening.
> Review release-signing, network exposure, and deployment assumptions before distributing builds more broadly.

## Screenshots
<p align="center">
  <img src="screehshot_server.png" width="300" />
  <img src="screehshot_client.png" width="300" />
</p>

### ⚠️ Special Disclaimer
**All code in this project (including the Windows Server and Android App) was automatically generated by the Gemini CLI.**  
*   The developer has conducted basic functional testing and confirmed it is operational.
*   The developer **has not conducted a line-by-line manual code review** or refactoring of the internal logic and security mechanisms.
*   This project is currently in the **Prototype** stage and is intended for Proof of Concept (PoC) purposes.

---

## Why AS2P?

There are several audio streaming solutions available on the market (e.g., AudioRelay, SoundWire, VBAN), but many are:      
*   **Proprietary/Closed Source**: You don't know what's happening under the hood.
*   **Paid/Subscription Based**: Features like high-quality audio or low latency are often locked behind a paywall.
*   **Over-complicated**: They often include complex routing features that users don't need for a simple PC-to-phone bridge.

**AS2P** is built to be a **Free, Open-Source, and Lightweight** alternative. It focuses on one thing and doing it well: **Streaming high-quality audio with minimal latency and maximum stability.**

---

## Key Features
*   **Zero Bloat**: No ads, no tracking, no complex setup. Just connect and listen.
*   **Modern Visual Interface**: 
    *   **Windows**: Centralized, lightweight interface with "Run at Startup" support.
    *   **Android**: Material Design 3 Dark Theme with a **Dynamic Latency Chart**, **MediaStyle Notification**, and **Collapsible Advanced Tuning**.
*   **Custom Setting Preset (v1.2.0)**:
    *   **Advanced Tuning UI**: Complete control over Bitrate, Buffer Size, Catch-up Threshold, and PCM Pre-decode Target.
    *   **Demand-based Decoding**: Tailor the CPU vs. Network stability balance by adjusting the PCM inventory target.
*   **Eco-Friendly Performance (v1.2.1)**:
    *   **Deep Power Optimization**: Automatically stops non-essential background calculations and UI updates when the screen is off, maximizing battery life.
    *   **Static Notifications**: Clean notification tray that only updates on state changes to reduce system overhead.
*   **High Resilience Architecture (v1.2.2)**:
    *   **Server Loop Decoupling**: Completely separates audio capture/encoding from network handling. Prevents Discord or high network traffic from jittering the 5ms audio heart-beat.
    *   **Process Priority Elevation**: Automatically elevates `server.exe` to `HIGH_PRIORITY_CLASS` on Windows to ensure CPU scheduling dominance during heavy system load.
    *   **Fixed Android UI Steps**: Corrected slider logic for `PCM Pre-decode Target` to ensure smooth integer-only selection.
*   **High Performance Architecture**:
    *   **Decoupled Worker Thread**: Moves audio decoding out of the playback callback to eliminate glitches caused by CPU throttling.
    *   **Fine-grained Locking**: Optimized mutex usage to prevent playback thread blocking during long decode operations.
    *   **Atomic Reset Mechanism**: Includes a 100ms cooldown after preset switching to ensure seamless sequence synchronization.
    *   **PCM FIFO Buffer**: Uses a thread-safe circular buffer to absorb system-level performance jitter.
    *   **Oboe Exclusive Mode**: Direct hardware access for the lowest possible round-trip latency.
    *   **PLC Toggle**: Runtime switch to enable/disable Packet Loss Concealment for audio artifact control.
    *   **Optimized Redundancy**: Server introduces 1ms delay for duplicate packets to maximize time diversity against interference.
*   **Smart Persistence**: Automatically remembers your last used Latency Preset.
*   **Battery Optimization**: Proactively requests exemption to ensure glitch-free audio in background.
*   **Ultra-Low Latency (Pulse Architecture)**: 
    *   **UDP Port Unification**: Uses a single port (12345) for all traffic to maximize firewall penetration.
    *   **Jitter Buffer Catch-up**: Automatically drops old packets to maintain a strict latency target.
    *   **Double-Send Redundancy**: Server supports optional double-send mode to mitigate Wi-Fi interference.
*   **High Fidelity**: Uses the **Opus Codec** at 48kHz Stereo with **PLC (Packet Loss Concealment)** support.
*   **Anti-Clipping**: 10ms linear Fade-out/Fade-in on all transitions (Start/Stop/Device Change).
*   **CPU Efficient**: Optimized Windows server; stops UI updates when hidden to consume < 0.1% CPU.
*   **Background Stable**: Uses **Foreground Service** on Android to prevent system throttling, with persistent Media controls.
*   **Bluetooth-linked Lifecycle**: Automatically stops the app and closes the connection if Bluetooth headphones are disconnected, whether searching or streaming.
*   **Smart Disconnect**: Server automatically returns to Listening state if the connection is lost for 5 seconds.

## Supported Platforms

### Windows (Server)
*   **Tested**: Windows 10/11 (x64).
*   **Optimized**: Specifically designed to work flawlessly in background modes.

### Android (Client)
*   **Minimum**: Android 9.0 (Pie / API 28).
*   **Recommended**: Android 13/14/15.
*   **Hardware**: Fully supports 16KB page size environments (e.g., Pixel 6a).

---

## Technical Stack
*   **Backend (Rust)**: `cpal` for capture, `rubato` for resampling, `audiopus` for encoding, **Slint** for the GUI.
*   **Mobile (Kotlin/C++)**: `Oboe` (C++) for low-latency playback, `Jetpack Compose` for UI.
*   **Protocol**: **AS2P Pulse V8** (Custom UDP-based protocol).

---

## Initial Setup

### 1. Windows Audio Settings
To ensure the best audio quality:
*   Open **Sound Settings** on your Windows PC.
*   Set your default output device format to **48000 Hz (Studio Quality)**.

### 2. Firewall Configuration
The server communicates over **UDP Port 12345**.
*   Ensure your firewall allows inbound/outbound traffic on this port for both Server and Client.

---

## How to Use

### 1. Launch Server
1.  Run `server.exe`. By default, the console window is hidden for a cleaner experience.
2.  **Debug Console**: If you need to see logs or troubleshoot, open **CMD** or **PowerShell** and run:
    ```bash
    ./server.exe --debug
    ```
3.  **Arguments**:
    *   `--debug`: Enables detailed connection and audio logs.
    *   `--drop-rate <0.0-1.0>`: Simulates packet loss for testing stability (e.g., `0.1` for 10% loss).

### 2. Connect Client
1.  Open the Android app.
2.  Click **CONNECT**. It will broadcast a discovery signal and link with the server instantly.
3.  **Background Streaming**: You can now safely switch to other apps or turn off your screen. The connection will remain active until you click STOP or swipe away the app.
4.  **Spotify-style Notification**: Control the stream directly from your notification tray or lock screen.

### 3. Adjust Presets
Choose between **LOW_LATENCY**, **BALANCE**, **HIGH_QUALITY**, and **BEST_QUALITY** depending on your Wi-Fi stability.

## Troubleshooting
*   **Rapid Preset Switching**: Switching presets too quickly (multiple clicks in a second) may cause the server to fall behind in reconfiguration, potentially leading to a temporary loss of audio streaming. If this happens, wait a few seconds or click **STOP** then **CONNECT** again.
*   **Server White Background**: Occasionally, the server window may display a plain white background after running for a long period. This is a known rendering issue in the current prototype. Restarting the server or minimizing/restoring the window usually resolves it.
*   **Microsoft Defender Warning**: On some systems, the "Run at Startup" feature might trigger a false positive in Defender. This is due to the combination of network activity and audio capture in an unsigned executable. We have implemented delayed initialization to mitigate this.
*   **Zombie Icon**: Fixed in V8. Clicking Quit now removes the tray icon immediately.
*   **Mechanical Noise**: Ensure Windows is set to 48kHz, though the server now resamples automatically.
*   **No Audio Captured**: Ensure your PC is playing sound through the default output device.
## License
Licensed under the [MIT License](LICENSE).

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