pipewire/src/modules/module-spa-node.c

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2016 Axis Communications <dev-gstreamer@axis.com> */
/*                         @author Linus Svensson <linus.svensson@axis.com> */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#include "config.h"

#include <errno.h>
#include <getopt.h>
#include <limits.h>

#include <pipewire/impl.h>

#include "spa/spa-node.h"

/** \page page_module_spa_node SPA Node
 *
 * Load and manage an SPA node.
 */
#define NAME "spa-node"

PW_LOG_TOPIC_STATIC(mod_topic, "mod." NAME);
#define PW_LOG_TOPIC_DEFAULT mod_topic

#define MODULE_USAGE	"<factory> [key=value ...]"

static const struct spa_dict_item module_props[] = {
	{ PW_KEY_MODULE_AUTHOR, "Wim Taymans <wim.taymans@gmail.com>" },
	{ PW_KEY_MODULE_DESCRIPTION, "Load and manage an SPA node" },
	{ PW_KEY_MODULE_USAGE, MODULE_USAGE },
	{ PW_KEY_MODULE_VERSION, PACKAGE_VERSION },
};

struct node_data {
	struct pw_impl_node *this;
	struct pw_context *context;
	struct pw_properties *properties;

	struct spa_hook module_listener;
};

static void module_destroy(void *_data)
{
	struct node_data *data = _data;
	spa_hook_remove(&data->module_listener);
	pw_impl_node_destroy(data->this);
}

static const struct pw_impl_module_events module_events = {
	PW_VERSION_IMPL_MODULE_EVENTS,
	.destroy = module_destroy,
};

SPA_EXPORT
int pipewire__module_init(struct pw_impl_module *module, const char *args)
{
	struct pw_properties *props = NULL;
	spa_auto(pw_strv) argv = NULL;
	int n_tokens;
	struct pw_context *context = pw_impl_module_get_context(module);
	struct pw_impl_node *node;
        struct node_data *data;

	PW_LOG_TOPIC_INIT(mod_topic);

	if (args == NULL)
		goto error_arguments;

	argv = pw_split_strv(args, " \t", 2, &n_tokens);
	if (n_tokens < 1)
		goto error_arguments;

	if (n_tokens == 2) {
		props = pw_properties_new_string(argv[1]);
		if (props == NULL)
			return -errno;
	}

	node = pw_spa_node_load(context,
				argv[0],
				PW_SPA_NODE_FLAG_ACTIVATE,
				props,
				sizeof(struct node_data));

	if (node == NULL)
		return -errno;

	data = pw_spa_node_get_user_data(node);
	data->this = node;
	data->context = context;
	data->properties = props;

	pw_log_debug("module %p: new", module);
	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_arguments:
	pw_log_error("usage: module-spa-node " MODULE_USAGE);
	return -EINVAL;
}