🎶 Network Audio Receiver (UDP) for Raspberry Pi
A lightweight UDP stereo audio receiver for Raspberry Pi.
It outputs directly to ALSA, ensuring very low latency – ideal for real-time monitoring and live audio.
✨ Features
- Receives stereo audio over UDP (e.g., RTP stream)
- Direct ALSA audio output for minimal delay
- Developed in Free Pascal using Codetyphon on Debian Bookworm
- Automatic detection of incoming packets:
- Packets arrive → audio plays instantly
- No or silent packets for 5 seconds → audio output stops
- No codec → uncompressed audio, maximum quality, minimal processing delay
- On startup, the window is visible
-
If the “Start Minimized” checkbox is selected, the application will start minimized.
💡 Example Test Setup
- Sender: Raspberry Pi 4 streaming YouTube audio via Wi-Fi
- Receiver: Raspberry Pi 4 connected via Ethernet
- Output: 3.5 mm jack → HiFi amplifier
Result: Stable low-latency playback in a typical home network.
▶️ Usage
📤 Sender (System Audio)
Install ffmpeg:
sudo apt install ffmpeg
To transmit system audio, use the provided startup script StartFFmpegTransmitter.sh:
- Edit the script and replace the IP address with the address of your receiver.
- Set the port number to match the configuration on the receiver.
-
Make the script executable:
```bash
chmod +x StartFFmpegTransmitter.sh
Save the file, place it on the desktop, and start it with a double-click.
📥 Receiver
Start the player:
./udp_player
A window appears and starts playback automatically when UDP packets arrive.
🎯 Latency Optimization
- Lower buffer size → lower delay
- Too low → possible dropouts or crackling audio
- Best settings depend on:
- Network type (LAN allows lower latency than Wi-Fi)
- Raspberry Pi performance
- Audio hardware
🔊 Audio Volume
If sound is too quiet:
alsamixer
- Press
F6 to select the right device
- Raise the Master volume
Or via terminal:
amixer set ‘Master’ 100% unmute
📜 License
This project is licensed under the MIT License.
🌐 Other Projects by the Author
🌐 Other Projects by the Author
🌐 Other Projects by the Author
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