From ed78bbe5ba12be1f9bcc736f14c51da6b4f639f3 Mon Sep 17 00:00:00 2001 From: David Robillard Date: Wed, 8 Feb 2012 04:56:24 +0000 Subject: Rearrange tree so top level can be used as an include path for standard style LV2 includes. --- lv2/ns/ext/contexts/contexts.ttl | 134 --------------------------------------- 1 file changed, 134 deletions(-) delete mode 100644 lv2/ns/ext/contexts/contexts.ttl (limited to 'lv2/ns/ext/contexts/contexts.ttl') diff --git a/lv2/ns/ext/contexts/contexts.ttl b/lv2/ns/ext/contexts/contexts.ttl deleted file mode 100644 index c56c649..0000000 --- a/lv2/ns/ext/contexts/contexts.ttl +++ /dev/null @@ -1,134 +0,0 @@ -# LV2 Contexts Extension -# -# Allows for an LV2 plugin to have several independent contexts, each with its -# own run callback and associated ports. -# -# Copyright (C) 2007-2010 David Robillard -# -# 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 ctx: . -@prefix lv2: . -@prefix rdf: . -@prefix rdfs: . -@prefix xsd: . -@prefix doap: . -@prefix foaf: . - - - a lv2:Specification , lv2:Feature ; - doap:name "LV2 Contexts" ; - doap:shortdesc "Support for plugins with several execution contexts." ; - lv2:documentation """ -

An extension for LV2 plugins which have several execution contexts.

- -

Contexts allow plugins to run tasks and/or process input/output in -multiple threads. Contexts can be used to add non-realtime functionality -to a plugin while still keeping the audio run() method realtime safe.

- -

A context is an LV2 feature, so the usual LV2 feature mechanism is used -to determine whether a plugin has a given context, and whether or not it is -mandatory.

- -

Unless otherwise stated, each context (defined by some URI) adds a new -threading class similar to the Audio class defined by LV2. Each context has a -run callback and a connect_port callback both in the same class (i.e. can't be -called concurrently), but may be called concurrently with functions for other -contexts (excluding the Instantiation class). Context properties such as -ctx:hardRTCapable apply to both functions. -The host MUST only call the correct connect_port function associated with the -context for that port, i.e. it is an error to use the main LV2 connect_port -function on a port with a context other than the main LV2 run function.

-""" . - - -########################## -## Context Base Classes ## -########################## - -ctx:Context a rdfs:Class ; - rdfs:label "LV2 Context" ; - lv2:documentation """ -

A potentially concurrent context (callback) on a plugin.

- -

Ports are always associated with a context. If a port has no explicit context -property, then its context is ctx:audioContext (the default LV2 run() context).

- -

A plugin indicates support for a context by supporting an LV2 Feature with -that context's URI. If a plugin optionally supports a context (e.g. -<plugin> lv2:optionalFeature ctx:idleContext .), then -all ports associated with that context MUST be lv2:connectionOptional. Thus, -hosts that do not support contexts will connect such ports to NULL and the -plugin can run with only a standard LV2 run() context.

- -

Any plugin that supports any context (optionally or mandatorily) MUST adhere -to the following additional threading rules for LV2_Descriptor.connect_port:

-
    -
  • connect_port MUST only be called for a given port from the context -associated with that port
    • -
  • connect_port MAY be called concurrently for ports with different -contexts (but MUST NOT be called concurrently for multiple ports in the -same context)
    • -
-

Note this implies that any shared data access in connect_port may be -accessed concurrently. The plugin is responsible for any synchronisation -or locking necessary to make this possible.

-""" . - -ctx:audioContext a ctx:Context , lv2:Feature ; - rdfs:comment """The context of LV2_Descriptor.run().""" . - -ctx:messageContext a ctx:Context , lv2:Feature ; - lv2:documentation """ -

A non-realtime context for plugin control via message passing. This context -has a run method which takes a bitset of flags for parameters specifying which -input and output ports are valid before and after the run method has executed, -respectively (see LV2_Contexts_MessageContext).

-""" . - -ctx:idleContext a ctx:Context , lv2:Feature ; - rdfs:comment """ -A non-realtime idle context, periodically run by the host roughly every second. -This context never has any ports. -""" . - -ctx:requestRunFeature a lv2:Feature ; - lv2:documentation """ -

A feature allowing the plugin to request the execution of a particular -context at an arbitrary time. To support this feature, the host MUST pass an -LV2_Feature to instantiate with data pointing to a -LV2_Contexts_Request_Run_Feature.

- -

The plugin MAY call request_run with the given -data from any non-realtime context to demand soon-as-possible execution -of the specified context.

-""" . - -ctx:context a rdf:Property ; - rdfs:domain lv2:Port ; - rdfs:range ctx:Context ; - rdfs:label "is used in context" ; - rdfs:comment """ -The context a particular port is associated with; the port will only be -connected/read/written by that context. - -If no context is specified, the port is considered part of the default LV2 -audio context.""" . - - -- cgit v1.2.1