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‎LICENSE‎

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MIT License
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Copyright (c) 2025 RaspberryPiFpcHub
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎README.en.md‎

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# UDP Audio Receiver for Raspberry Pi (FPC / Qt5 / X11)
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This program receives audio data over UDP (e.g., RTP stream) and outputs it via ALSA. It was developed in Free Pascal using Codetyphon with Qt5 and runs under X11 on Debian Bookworm.
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The program automatically detects whether packets are being received:
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- If packets arrive → Audio is played.
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- If no packets are received for 5 seconds → Audio output stops, window is hidden.
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---
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## 💠 Requirements
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- Raspberry Pi with Debian Bookworm
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- Codetyphon with Qt5 (e.g., qt5pas; GTK2 should work as well)
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- ALSA installed
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- Network connection for receiving UDP packets
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---
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## 🔧 Compilation
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1. Ensure Codetyphon is installed and set up.
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2. Open the project in Codetyphon.
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3. Set the widgetset to `Qt5` (alternatively `gtk2`).
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4. Compile.
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Alternatively, via command line:
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```bash
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fpc -Mdelphi -Fu/path/to/qt5-units your_program.pas
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```
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---
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## ▶️ Usage
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### 📤 Sender (System Audio)
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The sender transmits system audio – everything normally played through the speaker.
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If not yet installed, install `ffmpeg`:
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```bash
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sudo apt install ffmpeg
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```
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To transmit system audio, start the sender with the following command:
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```bash
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ffmpeg -f pulse -i default \
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-acodec copy -f rtp \
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-fflags nobuffer -flags low_delay \
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-max_delay 0 -flush_packets 1 \
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-rtbufsize 0 -avioflags direct \
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-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 1 \
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rtp://192.168.1.1:5010
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```
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- `192.168.1.1` is the IP address of the receiver → adjust accordingly!
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- `5010` is the port number → freely selectable, must match the receiver
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### 📥 Receiver
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Simply start the receiver:
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```bash
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./udp_audio_receiver
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```
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A window will appear and automatically start playing audio when UDP packets are received.
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---
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## 🔊 If the audio is too quiet …
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This may occur if the receiver volume is set too low.
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### Possible solutions:
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- Use `alsamixer`, press `F6` to select the correct device, and increase volume
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- Or use the terminal:
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```bash
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amixer set 'Master' 100% unmute
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```
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---
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## 📁 Autostart
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Create the file:
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```bash
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/home/pi/.config/autostart/UdpReceiver.desktop
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```
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With the following content:
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```ini
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[Desktop Entry]
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Type=Application
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Exec=/path/to/program/udp_audio_receiver
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Hidden=false
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NoDisplay=false
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X-GNOME-Autostart-enabled=true
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Name=Udp_Receiver
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Comment=Automatically starts Udp_Receiver
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Name[de_DE]=Udp_Receiver.desktop
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```
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Adjust path and filename accordingly.
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---
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## 📝 License
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This project is licensed under the [MIT License](LICENSE).
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---
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**Author:** RaspberryPiFpcHub
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**GitHub:** https://github.com/RaspberryPiFpcHub
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‎udp_audio_receiver.conf‎

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ip=0.0.0.0
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port=5010
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SizeNetworkbuffer=100000
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frequenz=48000
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swap=0
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alsalatency=28000

‎udp_audio_receiver.ctpr‎

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<?xml version="1.0" encoding="UTF-8"?>
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<CONFIG>
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<ProjectOptions>
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<Version Value="12"/>
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<General>
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<SessionStorage Value="InProjectDir"/>
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<Title Value="udp_audio_receiver"/>
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<Scaled Value="True"/>
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<ResourceType Value="res"/>
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<UseXPManifest Value="True"/>
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<XPManifest>
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<DpiAware Value="True"/>
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</XPManifest>
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<Icon Value="0"/>
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</General>
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<BuildModes>
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<Item Name="Default" Default="True"/>
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</BuildModes>
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<PublishOptions>
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<Version Value="2"/>
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<UseFileFilters Value="True"/>
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</PublishOptions>
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<RunParams>
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<FormatVersion Value="2"/>
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</RunParams>
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<RequiredPackages>
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<Item>
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<PackageName Value="adLCL"/>
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</Item>
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</RequiredPackages>
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<Units>
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<Unit>
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<Filename Value="udp_audio_receiver.ppr"/>
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<FRMtype Value="0"/>
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<IsPartOfProject Value="True"/>
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</Unit>
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<Unit>
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<Filename Value="../../Projekte/RTP_player/unit1.pas"/>
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<FRMtype Value="0"/>
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<IsPartOfProject Value="True"/>
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<ComponentName Value="Form1"/>
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<HasResources Value="True"/>
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<ResourceBaseClass Value="Form"/>
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</Unit>
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</Units>
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</ProjectOptions>
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<CompilerOptions>
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<Version Value="11"/>
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<Target>
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<Filename Value="udp_audio_receiver"/>
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</Target>
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<SearchPaths>
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<IncludeFiles Value="$(ProjOutDir)"/>
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<OtherUnitFiles Value="../../Projekte/RTP_player"/>
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<UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
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</SearchPaths>
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<Linking>
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<Options>
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<Win32>
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<GraphicApplication Value="True"/>
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</Win32>
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</Options>
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</Linking>
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</CompilerOptions>
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<Debugging>
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<Exceptions>
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<Item>
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<Name Value="EAbort"/>
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</Item>
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<Item>
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<Name Value="ECodetoolError"/>
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</Item>
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<Item>
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<Name Value="EFOpenError"/>
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</Item>
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</Exceptions>
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</Debugging>
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</CONFIG>

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