aboutsummaryrefslogtreecommitdiffstats
path: root/lv2/lv2plug.in/ns/ext/atom/util.h
diff options
context:
space:
mode:
Diffstat (limited to 'lv2/lv2plug.in/ns/ext/atom/util.h')
-rw-r--r--lv2/lv2plug.in/ns/ext/atom/util.h56
1 files changed, 56 insertions, 0 deletions
diff --git a/lv2/lv2plug.in/ns/ext/atom/util.h b/lv2/lv2plug.in/ns/ext/atom/util.h
index 8ac8f28..5574e9b 100644
--- a/lv2/lv2plug.in/ns/ext/atom/util.h
+++ b/lv2/lv2plug.in/ns/ext/atom/util.h
@@ -442,6 +442,62 @@ lv2_atom_object_get(const LV2_Atom_Object* object, ...)
}
/**
+ Variable argument version of lv2_atom_object_query() with types.
+
+ This is like lv2_atom_object_get(), but each entry has an additional
+ parameter to specify the required type. Only atoms with a matching type
+ will be selected.
+
+ The arguments should be a series of uint32_t key, const LV2_Atom**, uint32_t
+ type triples, terminated by a zero key. The value pointers MUST be
+ initialized to NULL. For example:
+
+ @code
+ const LV2_Atom_String* name = NULL;
+ const LV2_Atom_Int* age = NULL;
+ lv2_atom_object_get(obj,
+ uris.name_key, &name, uris.atom_String,
+ uris.age_key, &age, uris.atom_Int
+ 0);
+ @endcode
+*/
+static inline int
+lv2_atom_object_get_typed(const LV2_Atom_Object* object, ...)
+{
+ int matches = 0;
+ int n_queries = 0;
+
+ /* Count number of keys so we can short-circuit when done */
+ va_list args;
+ va_start(args, object);
+ for (n_queries = 0; va_arg(args, uint32_t); ++n_queries) {
+ if (!va_arg(args, const LV2_Atom**) ||
+ !va_arg(args, uint32_t)) {
+ return -1;
+ }
+ }
+ va_end(args);
+
+ LV2_ATOM_OBJECT_FOREACH(object, prop) {
+ va_start(args, object);
+ for (int i = 0; i < n_queries; ++i) {
+ const uint32_t qkey = va_arg(args, uint32_t);
+ const LV2_Atom** qval = va_arg(args, const LV2_Atom**);
+ const uint32_t qtype = va_arg(args, uint32_t);
+ if (!*qval && qkey == prop->key && qtype == prop->value.type) {
+ *qval = &prop->value;
+ if (++matches == n_queries) {
+ return matches;
+ }
+ break;
+ }
+ }
+ va_end(args);
+ }
+ return matches;
+}
+
+/**
@}
@}
*/