A VST and AudioUnit plugin (as well as a standalone application for testing) to measure the loudness, according to ITU BS.1770 and EBU R128.
These sources correspond to the LUFSMeter version 0.5.1. The source code of newer versions are not public anymore. But if any issues in the measurement algorithm are discovered, they will be fixed here as well.
Official website: http://www.lufsmeter.com
The excellent JUCE framework (http://www.juce.com) is used extensively (included here).
Compile the standalone version for your platform first. You find a Makefile, a Visualstudio project as well as an XCode project in projects/LUFSMeterStandalone/Builds/. In the same vein go to projects/LUFSMeter/Builds/ to start building the plugin version.
The main sources are in projects/LUFSMeter/Source/.
Additional help is provided in docs/. Feel free to contact me.
You have to obtain a copy of the VST SDK by Steinberg if you want to compile it as a VST
(It's not allowed to redistribute it, but you get it for free).
Search for vst_sdk2_4_rev2.zip on http://www.steinberg.net/en/company/developer.html and copy
the pluginterfaces and public.sdk folders into the vstsdk2.4 directory.