Metadatas

So far the main metadata we saw for our processor is its name:

static consteval auto name() { return "Foo"; }

Or with the helper macro:

halp_meta(name, "Foo")

There are a few more useful metadatas that can be used and which will be used depending on whether the bindings support exposing them. Here is a list in order of importance; it is recommended that strings are used for all of these and that they are filled as much as possible.

  • name: the pretty name of the object.
  • c_name: a C-identifier-compatible name for the object. This is necessary for instance for systems such as Python, PureData or Max which do not support spaces or special characters in names.
  • uuid: a string such as 8a4be4ec-c332-453a-b029-305444ee97a0, generated for instance with the uuidgen command on Linux, Mac and Windows, or with uuidgenerator.net otherwise. This provides a computer-identifiable unique identifier for your plug-in, to ensure that hosts don't have collisions between plug-ins of the same name and different vendors when reloading them (sadly, on some older APIs this is unavoidable).
  • description: a textual description of the processor.
  • vendor: who distributes the plug-in.
  • product: product name if the plug-in is part of a larger product.
  • version: a version string, ideally convertible to an integer as some older APIs expect integer versions.
  • category: a category for the plug-in. "Audio", "Synth", "Distortion", "Chorus"... there's no standard, but one can check for instance the names used in LV2 or the list mentioned by DISTRHO.
  • copyright: (c) the plug-in authors 2022-xxxx
  • license: an SPDX identifier for the license or a link towards a license document
  • url: URL for the plug-in if any.
  • email: A contact e-mail if any.
  • manual_url: an url for a user manual if any.
  • support_url: an url for user support, a forum, chat etc. if any.