diff options
Diffstat (limited to 'ext/atom.lv2')
| -rw-r--r-- | ext/atom.lv2/atom.h | 53 | ||||
| -rw-r--r-- | ext/atom.lv2/atom.ttl | 145 |
2 files changed, 116 insertions, 82 deletions
diff --git a/ext/atom.lv2/atom.h b/ext/atom.lv2/atom.h index 4b57040..39d721c 100644 --- a/ext/atom.lv2/atom.h +++ b/ext/atom.lv2/atom.h @@ -76,13 +76,13 @@ typedef struct { } LV2_Atom_Literal; /** - An atom:ID. + An atom:URID or atom:BlankID. This type may safely be cast to LV2_Atom. */ typedef struct { uint32_t type; /**< Type of this atom (mapped URI). */ uint32_t size; /**< Size in bytes, not including type and size. */ - uint32_t id; /**< Value, a URI mapped to an integer. */ + uint32_t id; /**< URID (integer mapped URI) or blank node ID. */ } LV2_Atom_ID; /** @@ -119,13 +119,8 @@ typedef struct { } LV2_Thing; /** - An Event (a timestamped Atom). - - Note this struct is different from the other structs in this header in that - it does not describe the body of some LV2_Atom, but instead is a "larger" - type which contains an LV2_Atom as its payload. This makes it possible for - an Event to be interpreted as an Atom in-place by simply pointing at - the @ref body field of the Event. + An atom:Event, a timestamped Atom. + Note this type is not an LV2_Atom, but contains an Atom as payload. */ typedef struct { uint32_t frames; /**< Time in frames relative to this block. */ @@ -134,6 +129,46 @@ typedef struct { } LV2_Atom_Event; /** + An atom:Int32, a signed 32-bit integer. + This type may safely be cast to LV2_Atom. +*/ +typedef struct { + uint32_t type; + uint32_t size; + int32_t value; +} LV2_Atom_Int32; + +/** + An atom:Int64, a signed 64-bit integer. + This type may safely be cast to LV2_Atom. +*/ +typedef struct { + uint32_t type; + uint32_t size; + int64_t value; +} LV2_Atom_Int64; + +/** + An atom:Float, a 32-bit IEEE-754 floating point number. + This type may safely be cast to LV2_Atom. +*/ +typedef struct { + uint32_t type; + uint32_t size; + float value; +} LV2_Atom_Float; + +/** + An atom:Double, a 64-bit IEEE-754 floating point number. + This type may safely be cast to LV2_Atom. +*/ +typedef struct { + uint32_t type; + uint32_t size; + double value; +} LV2_Atom_Double; + +/** A buffer of events (the contents of an atom:EventPort). The host MAY elect to allocate buffers as a single chunk of POD by using diff --git a/ext/atom.lv2/atom.ttl b/ext/atom.lv2/atom.ttl index ce125d6..e49c544 100644 --- a/ext/atom.lv2/atom.ttl +++ b/ext/atom.lv2/atom.ttl @@ -20,6 +20,7 @@ @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . @prefix xsd: <http://www.w3.org/2001/XMLSchema#> . +@prefix owl: <http://www.w3.org/2002/07/owl#> . <http://lv2plug.in/ns/ext/atom> a lv2:Specification ; @@ -75,6 +76,7 @@ extension.</p> atom:Atom a rdfs:Class ; rdfs:label "Atom" ; + atom:cType "LV2_Atom" ; lv2:documentation """ <p>Abstract base class for all atoms. An LV2_Atom has a 32-bit <code>type</code> and <code>size</code> followed by a <code>body</code> of @@ -102,11 +104,13 @@ atom:String a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "String" ; + atom:cType "LV2_Atom_String" ; lv2:documentation """ <p>A UTF-8 encoded string.</p> -<p>The body of an atom:String is a C string in UTF-8 encoding, i.e. an array of -bytes (<code>uint8_t</code>) terminated with a NULL byte (<code>'\\0'</code>).</p> +<p>The body of an LV2_Atom_String is a C string in UTF-8 encoding, i.e. an +array of bytes (<code>uint8_t</code>) terminated with a NULL byte +(<code>'\\0'</code>).</p> <p>This type can be used for free-form strings, but in most cases it is better to use atom:Literal since this supports a language tag or datatype. Implementations @@ -118,48 +122,43 @@ atom:Literal a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "String Literal" ; + atom:cType "LV2_Atom_Literal" ; lv2:documentation """ -<p>A UTF-8 encoded string literal, with an optional language tag or datatype.</p> - -<p>This type is compatible with an RDF literal and is capable of expressing a -string in any language, or a value of any type. An LV2_Atom_Literal has a -URID <code>lang</code> and <code>datatype</code> followed by the -string data in UTF-8 encoding. The length of the string data in bytes is -<code>size - (2 * sizeof(uint32_t))</code>, including the terminating NULL -character. The <code>lang</code> field SHOULD be a URI of the form +<p>A UTF-8 encoded string literal, with an optional datatype or language.</p> + +<p>This type is compatible with rdf:Literal and is capable of expressing a +string in any language, or a value of any type. A Literal has a +<code>datatype</code> and <code>lang</code> followed by string data in UTF-8 +encoding. The length of the string data in bytes is <code>size - +sizeof(LV2_Atom_Literal)</code>, including the terminating NULL character. The +<code>lang</code> field SHOULD be a URI of the form <http://lexvo.org/id/term/LANG> where LANG is an <a href="http://www.loc.gov/standards/iso639-2/">ISO 693-2</a> or <a href="http://www.loc.gov/standards/iso639-2/">ISO 693-3</a> language code.</p> -<p>For example, "Hello" in English:</p> -<pre class="c-code"> -struct LV2_Atom { - uint16_t type = uri_to_id(atom:Literal); - uint16_t size = 14; -} -uint32_t datatype = 0; -uint32_t lang = uri_to_id("http://lexvo.org/id/term/en"); -char str[] = "Hello"; -</pre> -and French: +<p>For compatibility, a Literal MUST have either a <code>datatype</code> +or a <code>lang</code>, but never both.</p> + +<p>For example, a Literal can be "Hello" in English:</p> <pre class="c-code"> -struct LV2_Atom { - uint16_t type = uri_to_id(atom:Literal); - uint16_t size = 16; +void set_to_hello_in_english(LV2_Atom_Literal* lit) { + lit->type = map(expand("atom:Literal")); + lit->size = 14; + lit->datatype = 0; + lit->lang = map("http://lexvo.org/id/term/en"); + memcpy(lit->str, "Hello", sizeof("Hello")); // Assumes enough space } -uint32_t datatype = 0; -uint32_t lang = uri_to_id("http://lexvo.org/id/term/fr"); -char str[] = "Bonjour"; </pre> + <p>or a Turtle string:</p> <pre class="c-code"> -struct LV2_Atom { - uint16_t type = uri_to_id(atom:Literal); - uint16_t size = 64; +void set_to_turtle_string(LV2_Atom_Literal* lit, const char* ttl) { + lit->type = map(expand("atom:Literal")); + lit->size = 64; + lit->datatype = map("http://www.w3.org/2008/turtle#turtle"); + lit->lang = 0; + memcpy(lit->str, ttl, strlen(ttl) + 1); // Assumes enough space } -uint32_t datatype = uri_to_id("http://www.w3.org/2008/turtle#turtle"); -uint32_t lang = 0; -char str[] = "<http://example.org/foo> a <http://example.org/Thing> ." </pre> """ . @@ -167,6 +166,7 @@ atom:URID a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "Integer ID mapped from a URI" ; + atom:cType "LV2_Atom_ID" ; lv2:documentation """ An unsigned 32-bit integer mapped from a URI using the <a href="http://lv2plug.in/ns/ext/uri-map">URI Map</a> extension's @@ -177,6 +177,7 @@ atom:BlankID a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "Integer ID for a blank node" ; + atom:cType "LV2_Atom_ID" ; lv2:documentation """ An unsigned 32-bit integer identifier for a blank node. A BlankID is only meaningful within a limited scope (e.g. the Atom in which it appears), and @@ -188,38 +189,30 @@ atom:Vector a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "Vector" ; + atom:cType "LV2_Atom_Vector" ; lv2:documentation """ <p>A homogeneous sequence of atoms with equivalent type and size.</p> -<p>An LV2_Atom_Vector is a 16-bit <code>elem_count</code> and +<p>An LV2_Atom_Vector is a 32-bit <code>elem_count</code> and <code>elem_type</code> followed by <code>elem_count</code> atom bodies of type <code>elem_type</code>. The element type must be a fixed size atom:Atom type, i.e. the size of each element is the vector's <code>size / elem_count</code>.</p> -<p>For example, an atom:Vector containing 42 elements of type atom:Float looks -like this in memory:</p> +<p>For example, an atom:Vector containing 42 elements of type atom:Float:</p> <pre class="c-code"> -struct LV2_Atom { - uint16_t type = uri_to_id(atom:Vector); - uint16_t size = sizeof(LV2_Atom) + sizeof(LV2_Atom_Vector) + (42 * sizeof(float); -} -struct LV2_Vector { - uint16_t elem_count = 42; - uint16_t elem_type = uri_to_id(atom:Float); -} -float elem_00; -float elem_01; -... -float elem_41; +struct VectorOf42Floats { + uint32_t type; // map(expand("atom:Vector")) + uint32_t size; // sizeof(LV2_Atom_Vector) + (42 * sizeof(float); + uint32_t elem_count; // 42 + uint32_t elem_type; // map(expand("atom:Float")) + float elems[32]; +}; </pre> <p>Note that it is possible to construct a valid Atom for each element of the vector, even by an implementation which does not understand <code>elem_type</code>.</p> - -<p>A Vector header is 64-bits, thus the first element of a Vector is 64-bit -aligned if the Vector itself is 64-bit aligned.</p> """ . atom:Tuple @@ -234,20 +227,11 @@ and <code>size</code>.</p> 32 bits.</p> """ . -atom:Property - a rdfs:Class ; - rdfs:subClassOf atom:Atom ; - rdfs:label "Property of a Thing" ; - lv2:documentation """ -A single property of some lv2:Thing. An -LV2_Atom_Property has an atom:URID <code>key</code> and an atom:Atom -<code>value</code>. -""" . - atom:Thing a rdfs:Class ; rdfs:subClassOf atom:Atom ; rdfs:label "Thing" ; + atom:cType "LV2_Thing" ; lv2:documentation """ <p>Abstract base class for a "Thing", i.e. an atom:Atom with a number of <a href="#Property">properties</a>. An LV2_Object is an unsigned @@ -269,6 +253,7 @@ code using only a 64-bit header for both.</p> atom:Resource a rdfs:Class ; rdfs:subClassOf atom:Thing ; + atom:cType "LV2_Thing" ; lv2:documentation """ An atom:Thing where <code>id</code> is the URI of the resource mapped to an atom:URID. @@ -277,6 +262,7 @@ atom:URID. atom:Blank a rdfs:Class ; rdfs:subClassOf atom:Thing ; + atom:cType "LV2_Thing" ; lv2:documentation """ An atom:Thing where <code>id</code> is the blank node ID of the object, which is only meaningful within a certain limited scope (e.g. the container of the @@ -287,6 +273,7 @@ NOT an <a href="ID">ID</a>. atom:Message a rdfs:Class ; rdfs:subClassOf atom:Thing ; + atom:cType "LV2_Thing" ; lv2:documentation """ A atom:Thing where <code>id</code> is a message type ID. Conceptually, a Message is identical to a Blank, but is a distinct type with a single type @@ -299,6 +286,7 @@ value <code>id</code> unmapped to a URI. atom:Event a rdfs:Class ; rdfs:label "Event" ; + atom:cType "LV2_Atom_Event" ; lv2:documentation """ An atom with a time stamp header prepended, typically for sample accurate transmission via LV2 ports. See struct LV2_Atom_Event. @@ -309,40 +297,40 @@ atom:Bang rdfs:subClassOf atom:Atom ; rdfs:label "Bang (activity) (size = 0)" . -atom:Byte - a rdfs:Class ; - rdfs:subClassOf atom:Atom ; - rdfs:label "Byte (<code>size = 1</code>)" . - atom:Number a rdfs:Class ; - rdfs:subClassOf atom:Atom ; + rdfs:subClassOf atom:Atom ; rdfs:label "Number (abstract class)." . atom:Int32 a rdfs:Class ; rdfs:subClassOf atom:Number ; - rdfs:label "Signed 32-bit integer" . + rdfs:label "Signed 32-bit integer" ; + atom:cType "LV2_Atom_Int32" . atom:Int64 a rdfs:Class ; rdfs:subClassOf atom:Number ; - rdfs:label "Signed 64-bit integer" . + rdfs:label "Signed 64-bit integer" ; + atom:cType "LV2_Atom_Int64" . atom:Bool a rdfs:Class ; rdfs:subClassOf atom:Atom ; - rdfs:label "Signed 32-bit integer where 0 is false" . + rdfs:label "An atom:Int32 where 0 is false and all other values true" ; + atom:cType "LV2_Atom_Int32" . atom:Float a rdfs:Class ; rdfs:subClassOf atom:Number ; - rdfs:label "32-bit IEEE-754 floating point number" . + rdfs:label "32-bit IEEE-754 floating point number" ; + atom:cType "LV2_Atom_Float" . atom:Double a rdfs:Class ; rdfs:subClassOf atom:Number ; - rdfs:label "64-bit IEEE-754 floating point number" . + rdfs:label "64-bit IEEE-754 floating point number" ; + atom:cType "LV2_Atom_Double" . atom:blobSupport a lv2:Feature ; @@ -410,6 +398,17 @@ Intuitively, a MessagePort contains a "message" or "command" or "event" which is reacted to, NOT a "value" or "signal" (which is computed with). """ . +atom:cType + a rdf:Property , + owl:DatatypeProperty ; + rdfs:label "C type" ; + rdfs:domain rdfs:Class ; + rdfs:range xsd:string ; + rdfs:comment """ +The identifier for a C type describing the in-memory representation of +an instance of this class. +""" . + atom:EventPort a rdfs:Class ; rdfs:label "Event port" ; @@ -417,7 +416,7 @@ atom:EventPort lv2:documentation """ A port used for communicating time-stamped atoms in the audio context. Ports of this type are connected to an LV2_Atom_Buffer, which contains a flat -time-stamped sequence of atom:Event</a>. +time-stamped sequence of atom:Event. This port type is intended as a simpler and atom compatible successor to <a href="http://lv2plug.in/ns/ext/event#EventPort">ev:EventPort</a>. |