m-config-endpoint: allow specifying preferred-n-channels in endpoint.config

modules/module-config-endpoint/context.c

@@ -173,6 +173,9 @@ on_node_added (WpObjectManager *om, WpProxy *proxy, gpointer d)
     g_variant_builder_add (&b, "{sv}", "enable-monitor",
         g_variant_new_boolean (endpoint_data->e.c.enable_monitor));
 
+    g_variant_builder_add (&b, "{sv}", "preferred-n-channels",
+        g_variant_new_uint32 (endpoint_data->e.c.preferred_n_channels));
+
     wp_session_item_configure (ep, g_variant_builder_end (&b));
   }
 

modules/module-config-endpoint/parser-endpoint.c

@@ -156,6 +156,8 @@ wp_parser_endpoint_data_new (const gchar *location)
     wp_toml_table_get_boolean (c, "enable-control-port", &res->e.c.enable_control_port);
     res->e.c.enable_monitor = FALSE;
     wp_toml_table_get_boolean (c, "enable-monitor", &res->e.c.enable_monitor);
+    res->e.c.preferred_n_channels = 0;
+    wp_toml_table_get_uint32 (c, "preferred-n-channels", &res->e.c.preferred_n_channels);
   }
 
   return res;

modules/module-config-endpoint/parser-endpoint.h

@@ -32,6 +32,7 @@ struct WpParserEndpointData {
       gboolean enable_control_port;
       gboolean enable_monitor;
       guint direction;
+      guint preferred_n_channels;
     } c;
   } e;
 };