Stream your PC's system audio to two Bluetooth headphones at the same time.

• Captures system audio in real time (WASAPI loopback)
• Duplicates the audio stream to two selected output devices simultaneously
• Per-device volume control
• Latency sync slider (±100 ms) to compensate for Bluetooth delay mismatch
• Auto-detects Bluetooth headphones
• Real-time level meters for input and both outputs
• Dark-themed, modern PyQt6 GUI

Connect two BT headphones, hit Start, and both hear the same audio.

1. Download or build the app (see below)
2. Go to dist/DualBluetoothAudio/
3. Double-click DualBluetoothAudio.exe
4. Select two output devices → click Start Streaming

# Clone the repo
git clone https://github.com/your-username/dual-bluetooth-audio.git
cd dual-bluetooth-audio

# Install dependencies
pip install -r requirements.txt

# Launch
python src/main.py

pip install pyinstaller
python -m PyInstaller --noconfirm --onedir --windowed \
  --name "DualBluetoothAudio" \
  --hidden-import sounddevice \
  --hidden-import _sounddevice_data \
  --hidden-import pycaw \
  --hidden-import pycaw.pycaw \
  --hidden-import comtypes \
  --hidden-import comtypes.stream \
  --add-data "src;src" \
  src/main.py

The output will be in dist/DualBluetoothAudio/.

bluetooth/
├── .gitignore
├── README.md
├── plan.md              # Detailed project plan & roadmap
├── requirements.txt
├── src/
│   ├── main.py          # Entry point
│   ├── audio_engine.py  # WASAPI capture + dual playback engine
│   ├── device_manager.py# Audio device enumeration
│   ├── gui.py           # PyQt6 dark-themed UI
│   └── utils.py         # Ring buffer, logging, helpers
└── dist/
    └── DualBluetoothAudio/
        └── DualBluetoothAudio.exe

• Windows 10 or 11
• Python 3.10+ (if running from source)
• Two Bluetooth headphones paired in Windows Settings
• At least one Bluetooth adapter (two USB dongles recommended for guaranteed dual A2DP)

1. WASAPI Loopback Capture — Grabs whatever audio is playing on your PC
2. Ring Buffer — Thread-safe buffer stores captured PCM frames
3. Dual Output Streams — Two independent sounddevice output streams read from the buffer and play to your selected devices
4. Volume & Sync — Per-device gain control + adjustable delay offset to align the two headphones

• System audio capture (WASAPI loopback)
• Dual simultaneous output
• Per-device volume control
• Latency sync adjustment
• Dark-themed GUI
• Standalone .exe build
• Microphone input source option
• Per-app audio capture
• Auto-reconnect on disconnect
• System tray mode
• Audio EQ per channel

MIT — use it however you like.