# LV2 Reference Extension # Copyright 2007-2011 David Robillard # # Permission to use, copy, modify, and/or distribute this software for any # purpose with or without fee is hereby granted, provided that the above # copyright notice and this permission notice appear in all copies. # # THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. @prefix atom: . @prefix doap: . @prefix foaf: . @prefix lv2: . @prefix rdf: . @prefix rdfs: . @prefix reference: . a lv2:Specification ; doap:name "LV2 Reference" ; doap:shortdesc "A reference data type for using non-POD data." ; doap:release [ doap:revision "0.1" ; doap:created "2011-07-22" ] ; doap:maintainer [ a foaf:Person ; foaf:name "David Robillard" ; foaf:homepage ; rdfs:seeAlso ] ; lv2:documentation """

This extension defines a mechanism for working with generic/opaque dynamically allocated memory, called a "Blob", which is (unlike an Atom) not necessarily POD. Blobs are accessed via a reference:Reference, which is a special case of Atom that always has type = 0, is not POD, and can only be copied using host provided functions. This allows plugins and hosts to work with data of any type at all.

""" . reference:Reference a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "Reference" ; lv2:documentation """

Reference to an lv2:Blob. The actual contents of a Reference are opaque and host specific, and must not be copied, serialized, or otherwise interpreted by a plugin, except via functions provided by the host in LV2_Blob_Support.

A Reference is a special case of Atom with type = 0. "Null" is the unique Atom with type = 0 and size = 0.

""" . reference:blobSupport a lv2:Feature ; rdfs:label "Blob support" ; lv2:documentation """

Support for dynamically allocated blobs. If a host supports this feature, it MUST pass a LV2_Feature with URI http://lv2plug.in/ns/ext/atom#blobSupport and data pointing to a LV2_Blob_Support.

""" . reference:Blob a rdfs:Class ; rdfs:label "Blob" ; lv2:documentation """

Base class for all dynamically allocated blobs. An LV2_Blob is an opaque pointer to host data. The type and data of a blob can be accessed via host-provided functions in LV2_Blob_Support. The type of a blob can be any URI that describes a data format. Blobs are always allocated by the host, and unlike atoms are not necessarily POD.

Blob data MUST NOT be used in any way by an implementation that does not understand that blob type (unlike Atoms, meaningful type-oblivious use of a Blob is impossible).

""" .