feat(volume): Add constructor

src/lua_libpulse_glib/volume.c

@@ -6,6 +6,12 @@
 #include <string.h>
 
 
+int volume_new(lua_State* L) {
+    pa_cvolume* cvol = volume_from_lua(L, 1);
+    return volume_to_lua(L, cvol);
+}
+
+
 int volume_to_lua(lua_State* L, const pa_cvolume* pa_volume) {
     volume_t* volume = lua_newuserdata(L, sizeof(volume_t));
     if (pa_volume == NULL) {

src/lua_libpulse_glib/volume.h

@@ -47,6 +47,13 @@ int volume__newindex(lua_State*);
 /// Static Functions
 /// @section static
 
+/** Creates an instance of @{Volume}.
+ *
+ * @tparam table values An array of channel volumes.
+ * @treturn Volume
+ */
+int volume_new(lua_State*);
+
 
 /** Checks whether a value is a valid @{Volume}.
  *
@@ -228,6 +235,7 @@ static const struct luaL_Reg volume_mt[] = {
 
 
 static const struct luaL_Reg volume_lib[] = {
+    {"new",       volume_new     },
     { "is_valid", volume_is_valid},
     { NULL,       NULL           }
 };