LV2 Units extension

This extension defines a number of units for use in audio processing.

For example, to say that the port use the gain unit defined as units:db (decibels):

@prefix : <http://lv2plug.in/ns/extensions/units#> .

lv2:port [
    a            lv2:ControlRateInputPort ;
    lv2:datatype lv2:Float ;
    lv2:index    0 ;
    lv2:symbol   "gain" ;
    lv2:name     "gain" ;
    :unit        :db
]

Using the same form, plugins may also specify one-off units inline, to give better display hints to hosts:

lv2:port [
    a            lv2:ControlRateInputPort ;
    lv2:datatype lv2:Float ;
    lv2:index    0 ;
    lv2:symbol   "frob" ;
    lv2:name     "frob level" ;
    units:unit [
        a            units:NonSIUnit ;
        units:name   "frobnication" ;
        units:symbol "fr" ;
        units:render "%f f"
    ]
]

Units are defined by a number of properties:

units:name

A display name for the unit (eg. decibels)

units:symbol

The abbreviated symbol for the unit (eg. dB)

units:render

A printf(3) string to be used to render the numerical value (eg. "%f dB")

units:conversion

Defines a conversion into another unit, commonly the SI unit for the unit class (eg. units:conversion [ units:to units:m ; units:factor 1000 ]). conversions are expressed as either factors (multiplicand for the conversion) or offsets (addend for the conversion).

Automatically generated from units.ttl by lv2specgen at 2009-11-12 01:12 UTC

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