this is a simple header file to allow the compilation of audio plugins and audio plugin hosts following the industrial standard of Steinberg's VST(2).
Steinberg provides a VST2 SDK, but:
- it has a proprietary license
- is no longer available from Steinberg (as they removed the VST2-SDK to push VST3)
FST is the attempt to create a bona-fide reverse-engineered header file, that is created without reference to the official VST SDK and without its developer(s) having agreed to the VST SDK license agreement.
All reverse-engineering steps are documented in the REVERSE_ENGINEERING document.
FST is released under the GNU General Public License (version 3 or later).
It is our understanding that if you use the FST-header in your project, you have to use a compatible (Open Source) license for your project as well.
There are no plans to release FST under a more permissive license. If you want to build closed-source plugins (or plugin hosts), you have to use the official Steinberg VST2 SDK, and comply with their licensing terms.
So far, FST is not feature complete.
Opcodes that have not been reversed engineered yet are marked as deprecated,
so you get a compiler warning when using them.
If you find you need a specific opcode that is not supported yet, please file a bug at https://git.iem.at/zmoelnig/FST/issues
The more information you can provide, the more likely we will be able to implement missing or fix broken things.