doc: Add WpImplModule docs for the C and Lua API

docs/rst/c_api.rst

@@ -27,6 +27,7 @@ C API Documentation
    c_api/endpoint_api.rst
    c_api/spa_device_api.rst
    c_api/impl_node_api.rst
+   c_api/impl_module_api.rst
    c_api/properties_api.rst
    c_api/spa_type_api.rst
    c_api/spa_pod_api.rst

docs/rst/c_api/impl_module_api.rst

+.. _impl_module_api:
+
+Local Modules
+=============
+
+.. graphviz::
+  :align: center
+
+   digraph inheritance {
+      rankdir=LR;
+      GObject -> WpImplModule;
+   }
+
+.. doxygenstruct:: WpImplModule
+   :members:
+
+.. doxygengroup:: wpimplmodule
+   :content-only:

docs/rst/c_api/meson.build

@@ -6,6 +6,7 @@ sphinx_files += files(
   'device_api.rst',
   'endpoint_api.rst',
   'global_proxy_api.rst',
+  'impl_module_api.rst',
   'impl_node_api.rst',
   'iterator_api.rst',
   'link_api.rst',

docs/rst/lua_api.rst

@@ -17,3 +17,4 @@ Lua API Documentation
    lua_api/lua_proxies_api.rst
    lua_api/lua_session_item_api.rst
    lua_api/lua_spa_device_api.rst
+   lua_api/lua_impl_module_api.rst

docs/rst/lua_api/lua_gobject.rst

@@ -130,6 +130,8 @@ other GObject, GInterface        userdata holding reference to the object
 other GBoxed                     userdata holding reference to the object
 ================================ ===============================================
 
+.. _lua_gobject_lua_to_c:
+
 Lua to C
 ^^^^^^^^
 

docs/rst/lua_api/lua_impl_module_api.rst

+ .. _lua_impl_module_api:
+
+Local Modules
+=============
+
+The `ImplModule` object (which binds the :c:struct:`WpImplModule` C API) provides a way
+to load PipeWire modules in the WirePlumber process. Instantiating the object
+loads the module, and when the last reference to the returned module object is
+dropped, the module is unloaded.
+
+Constructors
+~~~~~~~~~~~~
+
+.. function:: ImplModule(name, arguments, properties)
+
+   Loads the named module with the provided arguments and properties (either of
+   which can be nil).
+
+   `name` is the module name, such as `"libpipewire-module-loopback"`.
+
+   `arguments` should be either `nil` or a string with the desired module
+   arguments.
+
+   `properties` can be nil or a table that can be :ref:`converted
+   <lua_gobject_lua_to_c>` to :c:struct:`WpProperties`.

docs/rst/lua_api/meson.build

@@ -2,6 +2,7 @@
 sphinx_files += files(
   'lua_core_api.rst',
   'lua_gobject.rst',
+  'lua_impl_module_api.rst',
   'lua_introduction.rst',
   'lua_log_api.rst',
   'lua_object_api.rst',