path: root/lv2/lv2plug.in
diff options
authorDavid Robillard <d@drobilla.net>2012-02-17 06:12:25 +0000
committerDavid Robillard <d@drobilla.net>2012-02-17 06:12:25 +0000
commit9db204f703d338e7b6434fccdedb1050c9124bf6 (patch)
treeb106d8520cbef66efc48cff1e3fd5468c87db085 /lv2/lv2plug.in
parent64f7c134aabf7b336b90cf3b8954a791ae91b546 (diff)
Add LV2_Atom_Port_Buffer.
Diffstat (limited to 'lv2/lv2plug.in')
2 files changed, 31 insertions, 3 deletions
diff --git a/lv2/lv2plug.in/ns/ext/atom/atom.h b/lv2/lv2plug.in/ns/ext/atom/atom.h
index fd0279c..66f0490 100644
--- a/lv2/lv2plug.in/ns/ext/atom/atom.h
+++ b/lv2/lv2plug.in/ns/ext/atom/atom.h
@@ -196,6 +196,29 @@ typedef struct {
/* Contents (a series of events) follow here. */
} LV2_Atom_Sequence;
+ The contents of an atom:AtomPort buffer.
+ This contains a pointer to an Atom, which is the data to be
+ processed/written, as well as additional metadata. This struct may be
+ augmented in the future to add more metadata fields as they become
+ necessary. The initial version of this struct contains data, size, and
+ capacity. Implementations MUST check that any other fields they wish to use
+ are actually present by comparing the size with the offset of that field,
+ e.g.:
+ @code
+ if (offsetof(LV2_Atom_Port_Buffer, field) < buf->size) {
+ do_stuff_with(buf->field);
+ }
+ @endcode
+typedef struct {
+ LV2_Atom* data; /** Pointer to data. */
+ uint32_t size; /** Total size of this struct. */
+ uint32_t capacity; /** Available space for data body. */
+} LV2_Atom_Port_Buffer;
#ifdef __cplusplus
} /* extern "C" */
diff --git a/lv2/lv2plug.in/ns/ext/atom/atom.ttl b/lv2/lv2plug.in/ns/ext/atom/atom.ttl
index b19425f..70a1252 100644
--- a/lv2/lv2plug.in/ns/ext/atom/atom.ttl
+++ b/lv2/lv2plug.in/ns/ext/atom/atom.ttl
@@ -389,9 +389,14 @@ atom:AtomPort
rdfs:subClassOf lv2:Port ;
rdfs:label "Atom Port" ;
lv2:documentation """
-<p>A port which contains an lv2:Atom. Ports of this type will be connected to
-a 64-bit aligned LV2_Atom immediately followed by <code>size</code> bytes of
+<p>A port which contains an lv2:Atom. Ports of this type are connected to an
+LV2_Atom_Port_Buffer, which contains a pointer to the port's Atom contents, as
+well as other metadata (such as capacity, for output ports with variably sized
+types). The host MUST set all fields of LV2_Atom_Port_Buffer to appropriate
+values before calling the plugin's run method. LV2_Atom_Port_Buffer::capacity
+must be set to the available space for the <em>body</em> of LV2_Atom_Port_Buffer::data,
+i.e. the maximum possible value for its <code>size</code> field, which does
+not include the LV2_Atom header.</p>
<p>This is an abstract port type with incomplete semantics which can not be
used directly as a port type. Atom ports should be either a atom:ValuePort or