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# The same set of namespace prefixes with two additions for LV2 extensions this
# plugin uses: atom and urid.
@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix lv2: <http://lv2plug.in/ns/lv2core#> .
@prefix midi: <http://lv2plug.in/ns/ext/midi#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix urid: <http://lv2plug.in/ns/ext/urid#> .
<http://lv2plug.in/plugins/eg-midigate>
a lv2:Plugin ;
doap:name "Example MIDI Gate" ;
doap:license <http://opensource.org/licenses/isc> ;
lv2:project <http://lv2plug.in/ns/lv2> ;
lv2:requiredFeature urid:map ;
lv2:optionalFeature lv2:hardRTCapable ;
# Describe program banks so the host can automate and/or present a user
# interface. Describing supported programs (or any other MIDI event) is not
# required, but is a good idea since it allows hosts to make better use of
# plugins. This plugin has a single bank of two programs, which have a
# (mandatory) label, and an (optional) comment to describe their meaning in
# more detail.
#
# Both programs and the bank have an index, which corresponds to the MIDI bank
# and program numbers that will activate them. Since there are other ways to
# change programs (not used here), an index is not strictly required, but must
# be present to support program changes from MIDI.
lv2:bank [
rdfs:label "Default" ;
lv2:index 0 ;
lv2:program [
lv2:index 0 ;
rdfs:label "Normal" ;
rdfs:comment "Input is passed through if notes are active."
] , [
lv2:index 1 ;
rdfs:label "Inverted" ;
rdfs:comment "Input is passed through if no notes are active."
]
] ;
# This plugin has three ports. There is an audio input and output as before,
# as well as a new AtomPort. An AtomPort buffer contains an Atom, which is a
# generic container for any type of data. In this case, we want to receive
# MIDI events, so the (mandatory) +atom:bufferType+ is atom:Sequence, which is
# a series of events with time stamps.
#
# Events themselves are also generic and can contain any type of data, but in
# this case we are only interested in MIDI events. The (optional)
# +atom:supports+ property describes which event types are supported. Though
# not required, this information should always be given so the host knows what
# types of event it can expect the plugin to understand.
#
# The (optional) +lv2:designation+ of this port is +lv2:control+, which
# indicates that this is the "main" control port where the host should send
# events it expects to configure the plugin, in this case changing the MIDI
# program. This is necessary since it is possible to have several MIDI input
# ports, though typically it is best to have one.
lv2:port [
a lv2:InputPort ,
atom:AtomPort ;
atom:bufferType atom:Sequence ;
atom:supports midi:MidiEvent ;
lv2:designation lv2:control ;
lv2:index 0 ;
lv2:symbol "control" ;
lv2:name "Control"
] , [
a lv2:AudioPort ,
lv2:InputPort ;
lv2:index 1 ;
lv2:symbol "in" ;
lv2:name "In"
] , [
a lv2:AudioPort ,
lv2:OutputPort ;
lv2:index 2 ;
lv2:symbol "out" ;
lv2:name "Out"
] .
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