This extension defines a simple mechanism for plugins to map URIs to and from integers, usually for performance reasons (e.g. processing events typed by URIs in real time). Typically, plugins map URIs to integers for things they "understand" at instantiation time, and store those values for use in the audio thread without doing any string comparison. This allows for the extensibility of RDF but with the performance of integers.

This extension is intended as an improved and simplified replacement for the uri-map extension, since the map context parameter has been found problematic. This extension is functionally equivalent to the uri-map extension with a NULL context. New implementations are encouraged to use this extension for URI mapping.

Index

InstancesFiles

Reference

Instance urid:map

A feature which is used to map URIs to integers. To support this feature, the host must pass an LV2_Feature to LV2_Descriptor::instantiate() with URI LV2_URID__map and data pointed to an instance of LV2_URID_Map.

Typelv2:Feature

Instance urid:unmap

A feature which is used to unmap URIs previously mapped to integers by urid:map. To support this feature, the host must pass an LV2_Feature to LV2_Descriptor::instantiate() with URI LV2_URID__unmap and data pointed to an instance of LV2_URID_Unmap.

Typelv2:Feature

History

Version 1.4 (2012-10-14)
  • Fix typo in urid:unmap documentation.
Version 1.2 (2012-04-17)
  • Merge with unified LV2 package.
  • Add feature struct names.
Version 1.0 (2011-11-21)
  • Initial release.