/**
   Prototype for plugin accessor function.

   Plugins are discovered by hosts using RDF data (not by loading libraries).
   See http://lv2plug.in for details on the discovery process, though most
   hosts should use an existing library to implement this functionality.

   This is the simple plugin discovery API, suitable for most statically
   defined plugins.  Advanced plugins that need access to their bundle during
   discovery can use lv2_lib_descriptor() instead.  Plugin libraries MUST
   include a function called "lv2_descriptor" or "lv2_lib_descriptor" with
   C-style linkage, but SHOULD provide "lv2_descriptor" wherever possible.

   When it is time to load a plugin (designated by its URI), the host loads the
   plugin's library, gets the lv2_descriptor() function from it, and uses this
   function to find the LV2_Descriptor for the desired plugin.  Plugins are
   accessed by index using values from 0 upwards.  This function MUST return
   NULL for out of range indices, so the host can enumerate plugins by
   increasing @p index until NULL is returned.

   Note that @p index has no meaning, hosts MUST NOT depend on it remaining
   consistent between loads of the plugin library.
*/
LV2_SYMBOL_EXPORT
const LV2_Descriptor * lv2_descriptor(uint32_t index);


/**
   Prototype for library accessor function.

   This is the more advanced discovery API, which allows plugin libraries to
   access their bundles during discovery, which makes it possible for plugins to
   be dynamically defined by files in their bundle.  This API also has an
   explicit cleanup function, removing any need for non-portable shared library
   destructors.  Simple plugins that do not require these features may use
   lv2_descriptor() instead.

   This is the entry point for a plugin library.  Hosts load this symbol from
   the library and call this function to obtain a library descriptor which can
   be used to access all the contained plugins.  The returned object must not
   be destroyed (using LV2_Lib_Descriptor::cleanup()) until all plugins loaded
   from that library have been destroyed.
*/
const LV2_Lib_Descriptor *
lv2_lib_descriptor(const char *               bundle_path,
                   const LV2_Feature *const * features);