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-# LV2 Plugin UI Extension
-# Copyright (C) 2010-2011 Lars Luthman <mail@larsluthman.net>
-#
-# Based on lv2.ttl, which is
-# Copyright (C) 2006-2008 Steve Harris, David Robillard
-#
-# This extension should be considered a replacement for the earlier
-# in-process UI extension with the URI <http://lv2plug.in/ns/extensions/ui>.
-# Hosts and plugins that used that extension should use this one instead.
-# The earlier in-process UI extension is not compatible with LV2 revision 3
-# and later and may break in subtle ways.
-#
-# Permission is hereby granted, free of charge, to any person obtaining a
-# copy of this software and associated documentation files (the "Software"),
-# to deal in the Software without restriction, including without limitation
-# the rights to use, copy, modify, merge, publish, distribute, sublicense,
-# and/or sell copies of the Software, and to permit persons to whom the
-# Software is furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included
-# in all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-# OTHER DEALINGS IN THE SOFTWARE.
-
-@prefix doap: <http://usefulinc.com/ns/doap#> .
-@prefix foaf: <http://xmlns.com/foaf/0.1/> .
-@prefix lv2: <http://lv2plug.in/ns/lv2core#>.
-@prefix pui: <http://lv2plug.in/ns/ext/pui#>.
-@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
-@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
-
-<http://lv2plug.in/ns/ext/pui>
- a lv2:Specification ;
- doap:license <http://usefulinc.com/doap/licenses/mit> ;
- doap:name "LV2 UI" ;
- doap:shortdesc "Generic UI interface for LV2 plugins." ;
- doap:release [
- doap:revision "0.1" ;
- doap:created "2011-03-26"
- ] ;
- doap:maintainer [
- a foaf:Person ;
- foaf:name "Lars Luthman" ;
- foaf:mbox <mailto:mail@larsluthman.net>
- ] ;
- lv2:documentation """
-<p>This extension defines an interface that can be used to create UIs for
-plugins. The UIs are code that reside in shared object files in an LV2
-bundle and are referenced in the RDF data using the triples:</p>
-<pre class="turtle-code">
-@prefix pui: &lt;http://lv2plug.in/ns/ext/pui#&gt; .
-
-&lt;http://example.org/my-ui&gt;
- a pui:Gtk2UI ;
- lv2:appliesTo &lt;http://example.org/my-plugin&gt; ;
- pui:binary &lt;my-ui.so&gt; .
-</pre>
-<p>... where <code>http://example.org/my-plugin</code> is the URI of the plugin,
-<code>http://example.org/my-ui</code> is the URI of the plugin UI and
-<code>my-ui.so</code> is the relative URI to the shared object file. While it
-is possible to have the plugin UI and the plugin in the same shared object file
-it is probably a good idea to keep them separate so that hosts that don't want
-UIs don't have to load the UI code.</p>
-
-<p>A UI MUST specify its class in the RDF data and the class MUST be a proper
-subclass of pui:UI, in this case pui:Gtk2UI. The class defines what type the
-UI is, e.g. what graphics toolkit it uses. There are no UI classes defined in
-this extension, those are specified separately (and anyone can define their
-own).</p>
-
-<p>It's entirely possible to have multiple UIs for the same plugin, or to have
-the UI for a plugin in a different bundle from the actual plugin - this way
-people other than the plugin author can write plugin UIs independently without
-editing the original plugin bundle. It is also possible to have one UI that
-works with several different plugins.</p>
-
-<p>UIs should also be written in such a way that the host may load several
-instances of an UI, or different UIs, and use them with the same plugin
-instance.</p>
-
-<p>Note that the process that loads the shared object file containing the UI
-code and the process that loads the shared object file containing the actual
-plugin implementation do not have to be the same. There are many valid reasons
-for having the plugin and the UI in different processes, or even on different
-machines. This means that you can <strong>not</strong> use singletons and
-global variables and expect them to refer to the same objects in the UI and the
-actual plugin. The function callback interface defined in the header pui.h is
-all you can expect to work.</p>
-""" .
-
-pui:UI
- a rdfs:Class ;
- rdfs:subClassOf lv2:Feature ;
- rdfs:label "UI" ;
- lv2:documentation """
-<p>The class which represents an LV2 plugin UI.
-</p>
-
-<p>To be used by a host a UI MUST have at least the following properties:</p>
-<ul>
-<li>rdf:type (with object a proper subclass of pui:UI)</li>
-<li>doap:name (one without language tag)</li>
-<li>lv2:binary (with a shared object file as object)</li>
-<li>lv2:appliesTo (with a LV2 plugin as object)</li>
-</ul>
-
-<p>The rdf:type of an UI is used by the host to decide whether it supports the
-UI and how to handle the LV2_PUI_Widget object that is returned by the UIs
-get_widget() function. For example, a type of pui:Gtk2UI might tell the
-host that LV2_PUI_Widget is a pointer to an object of a type defined in the
-Gtk+ library. No UI types are defined in this extension, that is intentionally
-left for other extensions.</p>
-
-<p>The doap:name property should be at most a few words in length using title
-capitalization, e.g. "Flashy Mixer GUI". Use lv2:documentation for more
-detailed descriptions.</p>
-
-<p>UIs may have optional or required features, specified using lv2:optionalFeature
-or lv2:requiredFeature. The same rules apply here as for plugins; a host MUST
-pass the LV2_Feature objects for all features it supports to the UI's
-instantiate() function, a host SHOULD NOT try to instantiate an UI if it
-doesn't support all of its required features, and an UI MUST fail to
-instantiate if the host doesn't pass all required features to instantiate().
-</p>
-
-<p>For details about the C API used to load UIs, see the file pui.h.
-</p>
-""" .
-
-pui:PortProtocol
- a rdfs:Class ;
- rdfs:subClassOf lv2:Feature ;
- rdfs:label "Port protocol" ;
- lv2:documentation """
-<p>A PortProtocol defines a certain way of communicating port data between UI
-and plugin. PortProtocols can be specified in additional extensions, and
-those extensions MUST specify:
-</p>
-
-<ol>
-<li>Which plugin port types the buffer type is valid for</li>
-<li>When the host should call port_event() in LV2_PUI_Descriptor</li>
-<li>The format of the data in the buffer passed to port_event()</li>
-<li>The format of the data in the buffer passed to write_port()</li>
-<li>What happens when the UI calls write_port() in LV2_PUI_Host_Descriptor</li>
-<li>What data (if any) should be passed in the LV2_Feature data pointer. </li>
-</ol>
-
-<p>For an example, see pui:floatControl or pui:floatPeakRMS.
-</p>
-
-<p>PortProtocol is a subclass of lv2:Feature, so UIs use lv2:optionalFeature and
-lv2:requiredFeature to specify which PortProtocols they want to use.
-</p>
-""" .
-
-pui:floatControl
- a pui:PortProtocol ;
- rdfs:label "Floating point value" ;
- lv2:documentation """
-<p>The rules (see pui:PortProtocol) for this port protocol are:</p>
-<ol>
-<li>This PortProtocol is valid for ports with the type lv2:ControlPort.</li>
-<li>The host SHOULD call port_event() as soon as possible when the port value
- has changed, but the plugin MUST NOT depend on a call for every change or
- the timing of the calls. However, the host MUST do the calls in the same
- order that the value changes occur in.</li>
-<li>The format of the data in the buffer passed to port_event() is a single
- float, and the buffer size is sizeof(float).</li>
-<li>Same as 3.</li>
-<li>The host SHOULD change the port value as soon as possible when write_port()
- is called, but the UI MUST NOT depend on a change for every call or the
- timing of the changes. However, the host MUST do the changes in the same
- order that the function calls occur in.</li>
-<li>The data pointer in the LV2_Feature object for this feature should be
- NULL.</li>
-</ol>
-""" .
-
-pui:floatPeakRMS
- a pui:PortProtocol ;
- rdfs:label "Peak and RMS for a period of audio data" ;
- lv2:documentation """
-<p>This port protocol defines a way for the host to send continuous peak
-and RMS measurements of the audio signal at a certain port to the UI. The
-intended use is visualisation, e.g. an animated meter widget that shows
-the level of the audio input or output.</p>
-
-<p>A contiguous sequence of audio samples for which a single peak value
-and a single RMS value have been computed is called a <em>measurement
-period</em>.</p>
-
-<p>The rules (see pui:PortProtocol) for this port protocol are:</p>
-<ol>
-<li>This PortProtocol is valid for ports with the type lv2:AudioPort.</li>
-<li>The host SHOULD call port_event() at regular intervals. The measurement
- periods used for calls to port_event() for the same port SHOULD be
- contiguous (i.e. the measurement period for one call should begin right
- after the end of the measurement period for the previous call ends) unless
- the UI has removed and re-added the port subscription between those calls.
- However, UIs MUST NOT depend on either the regularity of the calls or the
- contiguity of the measurement periods; hosts may change the call rate
- or skip calls for performance or other reasons. Measurement periods for
- different calls to port_event() for the same port MUST NOT overlap.</li>
-<li>The format of the data in the buffer passed to port_event() is a single
- LV2_PUI_Peak_RMS_Data object, and the buffer size is
- sizeof(LV2_PUI_Peak_RMS_Data).</li>
-<li>The UI MUST NOT call write_port() with the ID for this port protocol as
- the port_protocol parameter.</li>
-<li>The host MUST ignore any write_port() calls with the ID for this port
- protocol as the port_protocol parameter.</li>
-<li>The data pointer in the LV2_Feature object for this feature should be
- NULL.</li>
-</ol>
-""" .
-
-pui:events
- a pui:PortProtocol ;
- rdfs:label "Event buffer" ;
- lv2:documentation """
-<ol>
-<li>This PortProtocol is valid for ports with the type ev:EventPort.</li>
-<li>The host MUST call port_event() whenever there is an event in an input port
- prior to the plugin instance's run() function is called, and whenever there
- is an event in an output port after run() has been called. The UI MUST NOT
- depend on the timing of the calls. However, the host MUST do the calls in
- the same order that the events occur in. The host is allowed and encouraged
- to bundle multiple events into a single port_event() call if it improves
- performance.</li>
-<li>The data buffer passed to port_event() is an LV2_Event_Buffer, as specified
- in the Event extension. The stamp_type MUST be ignored. The frames and
- subframes fields of every event in the buffer MUST be ignored. Events with
- type 0 (reference counted events) MUST be ignored.</li>
-<li>The data buffer passed to write_event() is an LV2_Event_Buffer, as
- specified in the Event extension. The stamp_type MUST be ignored. The
- frames and subframes fields of every event in the buffer MUST be
- ignored. The host MUST NOT pass events with type 0 (references) unless the
- UI supports the feature "http://lv2plug.in/ns/ext/event".</li>
-<li>The host MUST pass all the events in the buffer to the plugin instance's
- event port in the same order, but the plugin and the UI MUST NOT depend on
- the timing of the events, or on whether they are all sent to the plugin in
- the same run() call or distributed over multiple calls.</li>
-<li>The data pointer in the LV2_Feature object for this feature should be
- NULL.</li>
-</ol>
-""" .
-
-pui:Gtk2UI
- a rdfs:Class ;
- rdfs:subClassOf pui:UI ;
- rdfs:label "Gtk+ UI" ;
- lv2:documentation """
-<p>The class which represents a Gtk+ UI. For a successfully created instance of
-an UI of this class, the get_widget() function MUST return a pointer to a valid
-GtkWidget object compatible with Gtk+ version 2.0. The host MUST ensure that
-the Gtk+ library has been initialised and that the Glib main loop is running
-before an UI of this type is instantiated.</p>
-
-<p>Unless otherwise specified by extensions, all function pointers in
-LV2_PUI_Descriptor may only be called from the thread that runs the Glib main
-loop.</p>
-""" .
-
-pui:noHostResize
- a lv2:Feature ;
- rdfs:label "No host resize" ;
- lv2:documentation """
-<p>This Feature should only be used with UIs.</p>
-
-<p>When this Feature is active the host SHOULD NOT resize the UI widget to any
-other size than its natural size, which the host should be able to determine
-via the API of whatever toolkit the UI is implemented in. However, the UI MUST
-NOT break if the widget is resized to another size. This Feature can be used
-for example when the widget uses a fixed-size pixmap interface.</p>
-
-<p>The data pointer in the LV2_Feature object for this Feature should be set to
-NULL.</p>
-""" .