pipewire/src/modules/module-metadata/proxy-metadata.c

/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#include <stdio.h>
#include <unistd.h>
#include <errno.h>

#include <spa/pod/parser.h>

#include "pipewire/pipewire.h"
#include "pipewire/extensions/metadata.h"

struct object_data {
	struct pw_metadata *object;
	struct spa_hook object_listener;
	struct spa_hook object_methods;

        struct pw_proxy *proxy;
	struct spa_hook proxy_listener;
};

static void proxy_object_destroy(void *_data)
{
	struct object_data *data = _data;
	spa_hook_remove(&data->proxy_listener);
	spa_hook_remove(&data->object_listener);
	spa_hook_remove(&data->object_methods);
}

static const struct pw_proxy_events proxy_events = {
	PW_VERSION_PROXY_EVENTS,
	.destroy = proxy_object_destroy,
};

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)
{
	struct pw_metadata *meta = object;
	struct spa_interface *iface, *miface;
	struct pw_proxy *proxy;
	struct object_data *data;

	proxy = pw_core_create_object(core,
				    "metadata",
				    PW_TYPE_INTERFACE_Metadata,
				    PW_VERSION_METADATA,
				    props,
				    user_data_size + sizeof(struct object_data));
        if (proxy == NULL)
		return NULL;

	data = pw_proxy_get_user_data(proxy);
	data = SPA_PTROFF(data, user_data_size, struct object_data);
	data->object = object;
	data->proxy = proxy;

	iface = (struct spa_interface*)proxy;
	miface = (struct spa_interface*)meta;

	pw_proxy_install_marshal(proxy, true);

	pw_proxy_add_listener(proxy, &data->proxy_listener, &proxy_events, data);

	pw_proxy_add_object_listener(proxy, &data->object_methods,
			miface->cb.funcs, miface->cb.data);
	pw_metadata_add_listener(meta, &data->object_listener,
			iface->cb.funcs, iface->cb.data);

	return proxy;
}