properties: add function to copy list of keys

2 files changed, 26 insertions, 0 deletions

diff --git a/src/pipewire/properties.c b/src/pipewire/properties.c
index 6a486481..77be22bf 100644
--- a/src/pipewire/properties.c
+++ b/src/pipewire/properties.c
@@ -203,6 +203,29 @@ struct pw_properties *pw_properties_copy(const struct pw_properties *properties)
 	return pw_properties_new_dict(&properties->dict);
 }
 
+/** Copy multiple keys from one property to another
+ *
+ * \param src properties to copy from
+ * \param dst properties to copy to
+ * \param keys a NULL terminated list of keys to copy
+ * \return the number of keys changed in \a dest
+ *
+ * \memberof pw_properties
+ */
+SPA_EXPORT
+int pw_properties_copy_keys(const struct pw_properties *src,
+		struct pw_properties *dst, const char *keys[])
+{
+	int i, changed = 0;
+	const char *str;
+
+	for (i = 0; keys[i]; i++) {
+		if ((str = pw_properties_get(src, keys[i])) != NULL)
+			changed += pw_properties_set(dst, keys[i], str);
+	}
+	return changed;
+}
+
 /** Clear a properties object
  *
  * \param properties properties to clear
diff --git a/src/pipewire/properties.h b/src/pipewire/properties.h
index 05261083..4d5ce026 100644
--- a/src/pipewire/properties.h
+++ b/src/pipewire/properties.h
@@ -57,6 +57,9 @@ pw_properties_new_string(const char *args);
 struct pw_properties *
 pw_properties_copy(const struct pw_properties *properties);
 
+int pw_properties_copy_keys(const struct pw_properties *src,
+		struct pw_properties *dst, const char *keys[]);
+
 int
 pw_properties_update(struct pw_properties *oldprops,
 		     const struct spa_dict *dict);