FYI: Time for LV2 rev. 4

Alessio Treglia alessio at
Sat Mar 19 20:22:59 UTC 2011

---------- Forwarded message ----------
From: David Robillard <d at>
Date: Sat, Mar 19, 2011 at 5:10 PM
Subject: [LV2] LV2 4.0
To: devel at

LV2 4.0 is out.

More information about LV2 can be found at:

This release is a significant one, fixing many problems and
introducing a new standard (though optional) method of depending on
LV2 extensions. In particular, it is now possible to install
system-wide extensions and build against them using a standard include
style (without requiring a central authority on extension package
names). The lv2core package, as of this version, includes a utility
called lv2config that makes this possible.
See for details.

Changes (non-exhaustive):

 * Make doap:license suggested, but not required (for wrappers)
 * Define lv2:binary (MUST be in manifest.ttl)
 * Define lv2:majorVersion and lv2:minorVersion (MUST be in manifest.ttl)
 * Define lv2:documentation and use it to document lv2core
 * Add lv2:FunctionPlugin and lv2:ConstantPlugin classes
 * Move lv2:AmplifierPlugin under lv2:DynamicsPlugin
 * Loosen domain of lv2:optionalFeature and lv2:requiredFeature
   (to allow re-use in extensions)
 * Add generic lv2:Resource and lv2:PluginBase classes
 * Fix definition of lv2:minimum etc. (used for values, not scale points)
 * More precisely define properties with OWL
 * Move project metadata to manifest
 * Add lv2:enumeration port property.
 * Define run() pre-roll special case (sample_count == 0).

Release tarball is available at:
Documentation for LV2 core is available at: <>

Share and enjoy,

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Alessio Treglia          |
Debian Developer         | alessio at
Ubuntu Core Developer    | quadrispro at
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