audio package contains C++ audio codecs.
Install gcc compiler and make, then create the work directory structure in which you'll clone and build the audio repository and its dependencies: stream and basics.
mkdir -p ~/gameinstance/BUILD/lib && mkdir -p ~/gameinstance/BUILD/bin
cd ~/gameinstance
git clone https://github.com/gameinstance/basics
cd basics
make install
cd ..
git clone https://github.com/gameinstance/stream
cd stream
make install
cd ..
git clone https://github.com/gameinstance/audio
cd audio
make install
Build the tool, then set the shared lib directory and run the flac decoder:
cd ~/gameinstance/audio/tools
make release
LD_LIBRARY_PATH=../../BUILD/lib/ ./BUILD/flac-decoder input.flac output.wav