Return additional plugin data defined by some extenion.
A typical use of this facility is to return a struct containing function
pointers to extend the LV2_Descriptor API.
The actual type and meaning of the returned object MUST be specified
precisely by the extension. This function MUST return NULL for any
unsupported URI. If a plugin does not support any extension data, this
field may be NULL.
The host is never responsible for freeing the returned value.
Return additional plugin data defined by some extenion.
A typical use of this facility is to return a struct containing function pointers to extend the LV2_Descriptor API.
The actual type and meaning of the returned object MUST be specified precisely by the extension. This function MUST return NULL for any unsupported URI. If a plugin does not support any extension data, this field may be NULL.
The host is never responsible for freeing the returned value.