A simple metadata UI for shairport-sync, in C++ using Qt4.
See this article for further reference.
Based on shairport-sync-metadata-reader by Mike Brady
You need to create a Makefile for your specific device with qmake, and then build the program:
qmake
make
Or simply :
./compile.sh && ./run-gui.sh
I created a readable list of all DMAP and DAAP codes in markdown format here : DMAP_DAAP_Codes.md
MIT.