1 files changed, 281 insertions, 0 deletions
diff --git a/src/modules/spa/module-device-factory.c b/src/modules/spa/module-device-factory.c
new file mode 100644
index 0000000..fd712a2
--- /dev/null
+++ b/src/modules/spa/module-device-factory.c
@@ -0,0 +1,281 @@
+/* PipeWire
+ *
+ * Copyright © 2018 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 "spa-device.h"
+
+#define NAME "spa-device-factory"
+
+PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
+#define PW_LOG_TOPIC_DEFAULT mod_topic
+
+#define FACTORY_USAGE	SPA_KEY_FACTORY_NAME"=<factory-name> " \
+			"["SPA_KEY_LIBRARY_NAME"=<library-name>]"
+
+static const struct spa_dict_item module_props[] = {
+	{ PW_KEY_MODULE_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
+	{ PW_KEY_MODULE_DESCRIPTION, "Provide a factory to make SPA devices" },
+	{ PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
+};
+
+struct factory_data {
+	struct pw_context *context;
+
+	struct pw_impl_module *module;
+	struct spa_hook module_listener;
+
+	struct pw_impl_factory *factory;
+	struct spa_hook factory_listener;
+
+	struct spa_list device_list;
+};
+
+struct device_data {
+	struct spa_list link;
+	struct pw_impl_device *device;
+	struct spa_hook device_listener;
+	struct spa_hook resource_listener;
+};
+
+static void resource_destroy(void *data)
+{
+	struct device_data *nd = data;
+	pw_log_debug("device %p", nd);
+	spa_hook_remove(&nd->resource_listener);
+	if (nd->device)
+		pw_impl_device_destroy(nd->device);
+}
+
+static const struct pw_resource_events resource_events = {
+	PW_VERSION_RESOURCE_EVENTS,
+	.destroy = resource_destroy
+};
+
+static void device_destroy(void *data)
+{
+	struct device_data *nd = data;
+	spa_list_remove(&nd->link);
+	spa_hook_remove(&nd->device_listener);
+	nd->device = NULL;
+}
+
+static const struct pw_impl_device_events device_events = {
+	PW_VERSION_IMPL_DEVICE_EVENTS,
+	.destroy = device_destroy,
+};
+
+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 = data->context;
+	struct pw_impl_device *device;
+	const char *str;
+	char *factory_name = NULL;
+	struct device_data *nd;
+	struct pw_impl_client *client;
+	int res;
+
+	if (properties == NULL)
+		goto error_properties;
+
+	if ((str = pw_properties_get(properties, SPA_KEY_FACTORY_NAME)) == NULL)
+		goto error_properties;
+
+	if ((factory_name = strdup(str)) == NULL)
+		goto error_properties;
+
+	pw_properties_setf(properties, PW_KEY_FACTORY_ID, "%d",
+			pw_global_get_id(pw_impl_factory_get_global(data->factory)));
+
+	client = resource ? pw_resource_get_client(resource) : NULL;
+
+	if (client) {
+		pw_properties_setf(properties, PW_KEY_CLIENT_ID, "%d",
+			pw_global_get_id(pw_impl_client_get_global(client)));
+	}
+
+	device = pw_spa_device_load(context,
+				factory_name,
+				0,
+				properties,
+				sizeof(struct device_data));
+	if (device == NULL) {
+		res = -errno;
+		goto error_device;
+	}
+
+	nd = pw_spa_device_get_user_data(device);
+	nd->device = device;
+	spa_list_append(&data->device_list, &nd->link);
+
+	pw_impl_device_add_listener(device, &nd->device_listener, &device_events, nd);
+
+	if (client) {
+		struct pw_resource *bound_resource;
+
+		res = pw_global_bind(pw_impl_device_get_global(device),
+				client,
+				PW_PERM_ALL, version,
+				new_id);
+		if (res < 0)
+			goto error_bind;
+
+		if ((bound_resource = pw_impl_client_find_resource(client, new_id)) == NULL)
+			goto error_bind;
+
+		pw_resource_add_listener(bound_resource, &nd->resource_listener, &resource_events, nd);
+	}
+	free(factory_name);
+	return device;
+
+error_properties:
+	res = -EINVAL;
+	pw_resource_errorf_id(resource, new_id, res, "usage: "FACTORY_USAGE);
+	goto error_exit_cleanup;
+error_device:
+	pw_resource_errorf_id(resource, new_id, res,
+				"can't create device %s: %s", factory_name,
+				spa_strerror(res));
+	goto error_exit;
+error_bind:
+	pw_resource_errorf_id(resource, new_id, res, "can't bind device");
+	pw_impl_device_destroy(device);
+	goto error_exit;
+
+error_exit_cleanup:
+	pw_properties_free(properties);
+error_exit:
+	free(factory_name);
+	errno = -res;
+	return NULL;
+}
+
+static const struct pw_impl_factory_implementation factory_impl = {
+	PW_VERSION_IMPL_FACTORY_IMPLEMENTATION,
+	.create_object = create_object,
+};
+
+static void factory_destroy(void *data)
+{
+	struct factory_data *d = data;
+	struct device_data *nd;
+
+	spa_hook_remove(&d->factory_listener);
+
+	spa_list_consume(nd, &d->device_list, link)
+		pw_impl_device_destroy(nd->device);
+
+	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);
+	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;
+
+	PW_LOG_TOPIC_INIT(mod_topic);
+
+	factory = pw_context_create_factory(context,
+				 "spa-device-factory",
+				 PW_TYPE_INTERFACE_Device,
+				 PW_VERSION_DEVICE,
+				 NULL,
+				 sizeof(*data));
+	if (factory == NULL)
+		return -errno;
+
+	data = pw_impl_factory_get_user_data(factory);
+	data->factory = factory;
+	data->module = module;
+	data->context = context;
+	spa_list_init(&data->device_list);
+
+	pw_impl_factory_add_listener(factory, &data->factory_listener, &factory_events, data);
+	pw_impl_factory_set_implementation(factory, &factory_impl, data);
+
+	pw_log_debug("module %p: new", module);
+	pw_impl_module_update_properties(module, &SPA_DICT_INIT_ARRAY(module_props));
+
+	pw_impl_module_add_listener(module, &data->module_listener, &module_events, data);
+
+	return 0;
+}