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authorDavid Robillard <d@drobilla.net>2011-11-20 23:08:57 +0000
committerDavid Robillard <d@drobilla.net>2011-11-20 23:08:57 +0000
commit725d4a404b838da6b67d9da66228a1125bddef57 (patch)
treea1daab3d767c85b1b67ff3a9eb60d54721b2e5fc /ns/ext/pui
parent5ae0165d6d0420e95e22c1451e319b9e83398c28 (diff)
downloadlv2-725d4a404b838da6b67d9da66228a1125bddef57.tar.xz
Lay out repository structure to match include and URI structure.
Treat lv2core like all the other specifications in gendoc.py.
Diffstat (limited to 'ns/ext/pui')
l---------ns/ext/pui/ext.pc.in1
-rw-r--r--ns/ext/pui/manifest.ttl8
-rw-r--r--ns/ext/pui/pui.h374
-rw-r--r--ns/ext/pui/pui.ttl282
l---------ns/ext/pui/waf1
l---------ns/ext/pui/wscript1
6 files changed, 667 insertions, 0 deletions
diff --git a/ns/ext/pui/ext.pc.in b/ns/ext/pui/ext.pc.in
new file mode 120000
index 0000000..1cdad2a
--- /dev/null
+++ b/ns/ext/pui/ext.pc.in
@@ -0,0 +1 @@
+../../../ext.pc.in \ No newline at end of file
diff --git a/ns/ext/pui/manifest.ttl b/ns/ext/pui/manifest.ttl
new file mode 100644
index 0000000..1229118
--- /dev/null
+++ b/ns/ext/pui/manifest.ttl
@@ -0,0 +1,8 @@
+@prefix lv2: <http://lv2plug.in/ns/lv2core#>.
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
+
+<http://lv2plug.in/ns/ext/pui>
+ a lv2:Specification;
+ lv2:minorVersion 0;
+ lv2:microVersion 1;
+ rdfs:seeAlso <pui.ttl>.
diff --git a/ns/ext/pui/pui.h b/ns/ext/pui/pui.h
new file mode 100644
index 0000000..caa7deb
--- /dev/null
+++ b/ns/ext/pui/pui.h
@@ -0,0 +1,374 @@
+/************************************************************************
+ *
+ * Plugin UI extension for LV2
+ *
+ * Copyright (C) 2006-2011 Lars Luthman <mail@larsluthman.net>
+ *
+ * Based on lv2.h, which was
+ *
+ * Copyright (C) 2000-2002 Richard W.E. Furse, Paul Barton-Davis,
+ * Stefan Westerfeld
+ * Copyright (C) 2006 Steve Harris, David Robillard.
+ *
+ * This header is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License,
+ * or (at your option) any later version.
+ *
+ * This header is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+ * USA.
+ *
+ ***********************************************************************/
+
+/**
+ @file pui.h C API for the LV2 UI extension <http://lv2plug.in/ns/ext/pui>.
+
+ This file specifies a C API for communication between an LV2 host and an
+ LV2 UI. The interface is similar to the one used for actual LV2 plugins.
+
+ The entry point is the function lv2ui_descriptor().
+*/
+
+#ifndef LV2_PUI_H
+#define LV2_PUI_H
+
+#include <lv2.h>
+
+/** The URI of this extension (note this is not the same as the prefix). */
+#define LV2_PUI_URI "http://lv2plug.in/ns/ext/pui"
+
+/** The numerical ID returned by LV2_PUI_Host_Descriptor::port_index() for
+ invalid port symbols. */
+#define LV2_PUI_INVALID_PORT_INDEX ((uint32_t)-1)
+
+/** The full URI for the pui:floatControl PortProtocol. */
+#define LV2_PUI_FLOAT_CONTROL_URI "http://lv2plug.in/ns/ext/pui#floatControl"
+
+/** The full URI for the pui:floatPeakRMS PortProtocol. */
+#define LV2_PUI_FLOAT_PEAK_RMS_URI "http://lv2plug.in/ns/ext/pui#floatPeakRMS"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ A data type that is used to pass peak and RMS values for a period of
+ audio data at an input or output port to an UI, using port_event. See the
+ documentation for pui:floatPeakRMS for details about how and when this
+ should be done.
+*/
+typedef struct _LV2_PUI_Peak_RMS_Data {
+
+ /**
+ The start of the measurement period. This is just a running counter that
+ must not be interpreted as any sort of global frame position. It should
+ only be interpreted relative to the starts of other measurement periods
+ in port_event() calls to the same plugin instance.
+
+ This counter is allowed to overflow, in which case it should just wrap
+ around.
+ */
+ uint32_t period_start;
+
+ /**
+ The size of the measurement period, in the same units as period_start.
+ */
+ uint32_t period_size;
+
+ /**
+ The peak value for the measurement period. This should be the maximal
+ value for abs(sample) over all the samples in the period.
+ */
+ float peak;
+
+ /**
+ The RMS value for the measurement period. This should be the root mean
+ square value of the samples in the period, equivalent to
+ sqrt((pow(sample1, 2) + pow(sample2, 2) + ... + pow(sampleN, 2)) / N)
+ where N is period_size.
+ */
+ float rms;
+
+} LV2_PUI_Peak_RMS_Data;
+
+/**
+ A pointer to a widget or other type of UI.
+ The actual type is defined by the type of the UI defined in the RDF data.
+ All the functionality provided by this extension is toolkit independent, the
+ host only needs to pass the necessary callbacks and display the widget, if
+ possible. Plugins may have several UIs, in various toolkits.
+*/
+typedef void* LV2_PUI_Widget;
+
+/**
+ Handle for a particular instance of a UI.
+ It is valid to compare this to NULL (0 for C++) but otherwise the host MUST
+ NOT attempt to interpret it. The UI may use it to reference internal
+ instance data.
+*/
+typedef void* LV2_PUI_Handle;
+
+/**
+ Handle for host functions and data provided to a UI.
+ An object of this type is passed to the UI's instantiate() function, and the
+ UI must in turn pass it as the first parameter to the callbacks in
+ LV2_PUI_Host_Descriptor. The host may use it to reference internal data, such
+ as the plugin instance that the UI is associated with. The UI MUST NOT
+ interpret the value of an LV2_PUI_Host_Handle in any way.
+*/
+typedef void* LV2_PUI_Host_Handle;
+
+/**
+ Host-provided functions that the UI can use to control the plugin instance.
+
+ A pointer to an object of this type is passed to the lv2ui_descriptor()
+ function.
+
+ The host MUST provide non-NULL values for all the function pointers.
+*/
+typedef struct _LV2_PUI_Host_Descriptor {
+
+ /**
+ Send data to one of the plugin's input ports.
+
+ The @c buffer parameter MUST point to a block of data @c buffer_size
+ bytes large. The contents of this buffer and what the host should do
+ with it depends on the value of the @c port_protocol parameter.
+
+ The @c port_protocol parameter MUST be a numeric ID for a
+ pui:PortProtocol. Numeric IDs for PortProtocols are retrieved using the
+ port_protocol_id() function.
+
+ The @c buffer is only valid during the time of this function call, so if
+ the host wants to keep it for later use it has to copy the contents to an
+ internal buffer.
+
+ @param host_handle The @c host_handle that was passed to the UI's
+ instantiate() function.
+ @param port_index The index of the port that the data should be written
+ to, as returned by port_index().
+ @param buffer_size The size of the data pointed to by @c buffer, in
+ bytes.
+ @param port_protocol The numeric ID of the Port Protocol to use,
+ as returned by port_protocol_id().
+ */
+ void (*write_port)(LV2_PUI_Host_Handle host_handle,
+ uint32_t port_index,
+ uint32_t buffer_size,
+ uint32_t port_protocol,
+ void const* buffer);
+
+ /**
+ Return the numerical index for a port.
+ This index is used when writing data to ports using write_port() and whe
+ receiving data using port_event(). If @c port_symbol is not a valid port
+ symbol for @c plugin the host it MUST return
+ LV2_PUI_INVALID_PORT_INDEX. For performance reasons it may be a good idea
+ to cache port indices in the UI at instantiation time.
+
+ @param host_handle The LV2_PUI_Host_Handle that was passed to the UI's
+ instantiate() function.
+ @param port_symbol The port's symbol, as defined in the RDF data for
+ the plugin.
+ */
+ uint32_t (*port_index)(LV2_PUI_Host_Handle host_handle,
+ char const* port_symbol);
+
+ /**
+ Subscribe to updates for a port.
+ This means that the host will call the UI's port_event() function when
+ the port value changes (as defined by the PortProtocol).
+
+ Calling this function with the same @c port_index and @c port_protocol
+ as an already active subscription has no effect.
+
+ @param host_handle The @c host_handle that was passed to the UI's
+ instantiate() function.
+ @param port_index The index of the port, as returned by port_index().
+ @param port_protocol The numeric ID of the PortProtocol, as
+ returned by port_protocol_id().
+ */
+ void (*subscribe_to_port)(LV2_PUI_Host_Handle host_handle,
+ uint32_t port_index,
+ uint32_t port_protocol,
+ const LV2_Feature* const* features);
+
+ /**
+ Unsubscribe from updates for a port.
+ This means that the host will cease calling calling port_event() when
+ the port value changes.
+
+ Calling this function with a @c port_index and @c port_protocol that
+ does not refer to an active port subscription has no effect.
+
+ @param host_handle The @c host_handle that was passed to the UI's
+ instantiate() function.
+ @param port_index The index of the port, as returned by port_index().
+ @param port_protocol The numeric ID of the PortProtocol, as
+ returned by port_protocol_id().
+ */
+ void (*unsubscribe_from_port)(LV2_PUI_Host_Handle host_handle,
+ uint32_t port_index,
+ uint32_t port_protocol,
+ const LV2_Feature* const* features);
+
+
+} LV2_PUI_Host_Descriptor;
+
+/**
+ This struct contains the implementation of an UI. A pointer to an
+ object of this type is returned by the lv2ui_descriptor() function.
+*/
+typedef struct _LV2_PUI_Descriptor {
+
+ /**
+ The URI for this UI (not for the plugin it controls).
+ */
+ char const* URI;
+
+ /**
+ Create a new UI object and return a handle to it. This function works
+ similarly to the instantiate() member in LV2_Descriptor.
+
+ @param descriptor The descriptor for the UI to instantiate.
+
+ @param plugin_uri The URI of the plugin that this UI will control.
+
+ @param bundle_path The path to the bundle containing the RDF data that
+ references this shared object file, with trailing separator (e.g. '/').
+
+ @param host_descriptor A pointer to an object that contains function
+ pointers that the UI instance should use to control the plugin
+ instance. This pointer MUST be valid until cleanup() is called for this
+ UI instance.
+
+ @param host_handle A handle that the host may use to reference internal
+ data. It MUST be passed as the first parameter to the function
+ pointers in @c host_descriptor, and MUST NOT be interpreted in any other
+ way by the UI.
+
+ @param features A NULL-terminated array of LV2_Feature pointers. The
+ host must pass all feature URIs that it and the UI supports and any
+ additional data, just like in the LV2 plugin instantiate()
+ function. Note that UI features and plugin features are NOT necessarily
+ the same; @c features will probably not be the same array as the one the
+ plugin host passes to a plugin.
+ */
+ LV2_PUI_Handle (*instantiate)(
+ struct _LV2_PUI_Descriptor const* descriptor,
+ char const* plugin_uri,
+ char const* bundle_path,
+ LV2_PUI_Host_Descriptor const* host_descriptor,
+ LV2_PUI_Host_Handle host_handle,
+ LV2_Feature const* const* features);
+
+ /**
+ Return the widget pointer for the UI object.
+ This MUST return the same value during the entire lifetime of the UI
+ object.
+ */
+ LV2_PUI_Widget (*get_widget)(LV2_PUI_Handle ui);
+
+ /**
+ Destroy the UI object and the associated widget.
+ The host must not try to access the widget after calling this function.
+ */
+ void (*cleanup)(LV2_PUI_Handle ui);
+
+ /**
+ Notify the UI that something has happened to a subscribed port.
+
+ This is called by the host when something happens at a plugin port that
+ has been subscribed to using
+ LV2_PUI_Host_Descriptor::add_port_subscription().
+
+ The @c buffer is only valid during the time of this function call, so if
+ the UI wants to keep it for later use it has to copy the contents to an
+ internal buffer.
+
+ @param ui A handle for the UI object.
+ @param port_index The index of the port that has changed, as returned by
+ LV2_PUI_Host_Descriptor::port_index().
+ @param buffer_size The size of the data buffer in bytes.
+ @param port_protocol The format of the data buffer, as returned by
+ LV2_PUI_Host_Descriptor::port_protocol_id().
+ @param buffer A pointer to the data buffer.
+ */
+ void (*port_event)(LV2_PUI_Handle ui,
+ uint32_t port_index,
+ uint32_t buffer_size,
+ uint32_t port_protocol,
+ void const* buffer);
+
+ /**
+ Return a data structure associated with an extension URI.
+
+ This facility can be used by extensions to extend the LV2_PUI_Descriptor
+ API. This function adheres to the same rules as
+ LV2_Descriptor::extension_data, except it applies to UIs rather than
+ plugins.
+ */
+ void const* (*extension_data)(char const* uri);
+
+} LV2_PUI_Descriptor;
+
+typedef void* LV2_PUI_Lib_Data;
+
+/**
+ Descriptor for a plugin UI library.
+
+ Each plugin UI shared library has exactly one of these objects, accessed
+ via the lv2_pui_lib_descriptor() function in that library.
+*/
+typedef struct {
+ /**
+ Opaque library data which must be passed as the first parameter to
+ all the methods of this struct.
+ */
+ LV2_PUI_Lib_Data lib_data;
+
+ void (*cleanup)(LV2_PUI_Lib_Data lib_data);
+
+ /**
+ Prototype for UI accessor function.
+
+ This function follows the same rules as lv2_descriptor(), except it
+ applies to UIs rather than plugins.
+ */
+ LV2_PUI_Descriptor const* (*pui_descriptor)(LV2_PUI_Lib_Data lib_data,
+ uint32_t index);
+
+} LV2_PUI_Lib_Descriptor;
+
+/**
+ Prototype for UI library accessor function.
+
+ This is the entry point for a plugin UI library. Hosts load this symbol
+ from the library and call this function to obtain a library descriptor which
+ can be used to access all the UIs contained in this library. The returned
+ object must not be destroyed (with LV2_PUI_Lib_Descriptor::cleanup()) until
+ all UIs loaded from that library have been destroyed.
+*/
+LV2_PUI_Lib_Descriptor const* lv2_pui_lib_descriptor(
+ const char* bundle_path,
+ LV2_Feature const* const* features);
+
+/**
+ Type of the lv2_pui_lib_descriptor() function in a UI library.
+*/
+typedef LV2_PUI_Lib_Descriptor const* (*LV2_PUI_Lib_Descriptor_Func)(
+ const char* bundle_path,
+ LV2_Feature const* const* features);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LV2_PUI_H */
diff --git a/ns/ext/pui/pui.ttl b/ns/ext/pui/pui.ttl
new file mode 100644
index 0000000..c035e56
--- /dev/null
+++ b/ns/ext/pui/pui.ttl
@@ -0,0 +1,282 @@
+# 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>
+""" .
diff --git a/ns/ext/pui/waf b/ns/ext/pui/waf
new file mode 120000
index 0000000..917d5c5
--- /dev/null
+++ b/ns/ext/pui/waf
@@ -0,0 +1 @@
+../../../waf \ No newline at end of file
diff --git a/ns/ext/pui/wscript b/ns/ext/pui/wscript
new file mode 120000
index 0000000..cf8cbae
--- /dev/null
+++ b/ns/ext/pui/wscript
@@ -0,0 +1 @@
+../../../ext.wscript \ No newline at end of file