1 files changed, 241 insertions, 0 deletions
diff --git a/src/modules/module-metadata.c b/src/modules/module-metadata.c
new file mode 100644
index 0000000..b8619a4
--- /dev/null
+++ b/src/modules/module-metadata.c
@@ -0,0 +1,241 @@
+/* PipeWire
+ *
+ * Copyright © 2019 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <dlfcn.h>
+
+#include "config.h"
+
+#include <spa/utils/result.h>
+
+#include <pipewire/impl.h>
+#include <pipewire/extensions/metadata.h>
+
+/** \page page_module_metadata PipeWire Module: Metadata
+ */
+
+#define NAME "metadata"
+
+PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
+#define PW_LOG_TOPIC_DEFAULT mod_topic
+
+static const struct spa_dict_item module_props[] = {
+	{ PW_KEY_MODULE_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ PW_KEY_MODULE_DESCRIPTION, "Allow clients to create metadata store" },
+	{ PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
+};
+
+
+void * pw_metadata_new(struct pw_context *context, struct pw_resource *resource,
+		   struct pw_properties *properties);
+
+struct pw_proxy *pw_core_metadata_export(struct pw_core *core,
+		const char *type, const struct spa_dict *props, void *object, size_t user_data_size);
+
+int pw_protocol_native_ext_metadata_init(struct pw_context *context);
+
+struct factory_data {
+	struct pw_impl_factory *factory;
+	struct spa_hook factory_listener;
+
+	struct pw_impl_module *module;
+	struct spa_hook module_listener;
+
+	struct pw_export_type export_metadata;
+};
+
+static void *create_object(void *_data,
+			   struct pw_resource *resource,
+			   const char *type,
+			   uint32_t version,
+			   struct pw_properties *properties,
+			   uint32_t new_id)
+{
+	struct factory_data *data = _data;
+	struct pw_context *context = pw_impl_module_get_context(data->module);
+	void *result;
+	struct pw_resource *metadata_resource = NULL;
+	struct pw_impl_client *client = resource ? pw_resource_get_client(resource) : NULL;
+	int res;
+
+	if (properties == NULL)
+		properties = pw_properties_new(NULL, NULL);
+	if (properties == NULL)
+		return NULL;
+
+	pw_properties_setf(properties, PW_KEY_FACTORY_ID, "%d",
+			pw_impl_factory_get_info(data->factory)->id);
+	pw_properties_setf(properties, PW_KEY_MODULE_ID, "%d",
+			pw_impl_module_get_info(data->module)->id);
+
+	if (pw_properties_get(properties, PW_KEY_METADATA_NAME) == NULL)
+		pw_properties_set(properties, PW_KEY_METADATA_NAME, "default");
+
+	if (client) {
+		metadata_resource = pw_resource_new(client, new_id, PW_PERM_ALL, type, version, 0);
+		if (metadata_resource == NULL) {
+			res = -errno;
+			goto error_resource;
+		}
+
+		pw_properties_setf(properties, PW_KEY_CLIENT_ID, "%d",
+				pw_impl_client_get_info(client)->id);
+
+		result = pw_metadata_new(context, metadata_resource, properties);
+		if (result == NULL) {
+			properties = NULL;
+			res = -errno;
+			goto error_node;
+		}
+	} else {
+		result = pw_context_create_metadata(context, NULL, properties, 0);
+		if (result == NULL) {
+			properties = NULL;
+			res = -errno;
+			goto error_node;
+		}
+		pw_impl_metadata_register(result, NULL);
+	}
+	return result;
+
+error_resource:
+	pw_resource_errorf_id(resource, new_id, res,
+				"can't create resource: %s", spa_strerror(res));
+	goto error_exit;
+error_node:
+	pw_resource_errorf_id(resource, new_id, res,
+				"can't create metadata: %s", spa_strerror(res));
+	goto error_exit_free;
+
+error_exit_free:
+	if (metadata_resource)
+		pw_resource_remove(metadata_resource);
+error_exit:
+	pw_properties_free(properties);
+	errno = -res;
+	return NULL;
+}
+
+static const struct pw_impl_factory_implementation impl_factory = {
+	PW_VERSION_IMPL_FACTORY_IMPLEMENTATION,
+	.create_object = create_object,
+};
+
+static void factory_destroy(void *data)
+{
+	struct factory_data *d = data;
+	spa_hook_remove(&d->factory_listener);
+	d->factory = NULL;
+	if (d->module)
+		pw_impl_module_destroy(d->module);
+}
+
+static const struct pw_impl_factory_events factory_events = {
+	PW_VERSION_IMPL_FACTORY_EVENTS,
+	.destroy = factory_destroy,
+};
+
+static void module_destroy(void *data)
+{
+	struct factory_data *d = data;
+	spa_hook_remove(&d->module_listener);
+	spa_list_remove(&d->export_metadata.link);
+	d->module = NULL;
+	if (d->factory)
+		pw_impl_factory_destroy(d->factory);
+}
+
+static void module_registered(void *data)
+{
+	struct factory_data *d = data;
+	struct pw_impl_module *module = d->module;
+	struct pw_impl_factory *factory = d->factory;
+	struct spa_dict_item items[1];
+	char id[16];
+	int res;
+
+	snprintf(id, sizeof(id), "%d", pw_global_get_id(pw_impl_module_get_global(module)));
+	items[0] = SPA_DICT_ITEM_INIT(PW_KEY_MODULE_ID, id);
+	pw_impl_factory_update_properties(factory, &SPA_DICT_INIT(items, 1));
+
+	if ((res = pw_impl_factory_register(factory, NULL)) < 0) {
+		pw_log_error("%p: can't register factory: %s", factory, spa_strerror(res));
+	}
+}
+
+static const struct pw_impl_module_events module_events = {
+	PW_VERSION_IMPL_MODULE_EVENTS,
+	.destroy = module_destroy,
+	.registered = module_registered,
+};
+
+SPA_EXPORT
+int pipewire__module_init(struct pw_impl_module *module, const char *args)
+{
+	struct pw_context *context = pw_impl_module_get_context(module);
+	struct pw_impl_factory *factory;
+	struct factory_data *data;
+	int res;
+
+	PW_LOG_TOPIC_INIT(mod_topic);
+
+	if ((res = pw_protocol_native_ext_metadata_init(context)) < 0)
+		return res;
+
+	factory = pw_context_create_factory(context,
+				 "metadata",
+				 PW_TYPE_INTERFACE_Metadata,
+				 PW_VERSION_METADATA,
+				 NULL,
+				 sizeof(*data));
+	if (factory == NULL)
+		return -errno;
+
+	data = pw_impl_factory_get_user_data(factory);
+	data->factory = factory;
+	data->module = module;
+
+	pw_log_debug("module %p: new", module);
+
+	pw_impl_factory_set_implementation(factory,
+				      &impl_factory,
+				      data);
+
+	data->export_metadata.type = PW_TYPE_INTERFACE_Metadata;
+	data->export_metadata.func = pw_core_metadata_export;
+	if ((res = pw_context_register_export_type(context, &data->export_metadata)) < 0)
+		goto error;
+
+	pw_impl_factory_add_listener(factory, &data->factory_listener, &factory_events, data);
+	pw_impl_module_add_listener(module, &data->module_listener, &module_events, data);
+
+	pw_impl_module_update_properties(module, &SPA_DICT_INIT_ARRAY(module_props));
+
+	return 0;
+error:
+	pw_impl_factory_destroy(data->factory);
+	return res;
+}