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metadata: Add metadata API

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Metadata allows apps to attach properties to objects that can be
read by other apps.
Not complete yet, properties should be removed when the object is
removed.
This commit is contained in:
Wim Taymans 2019-11-03 10:31:14 +01:00
parent 8ddf579cc0
commit 0a81a982f7
12 changed files with 981 additions and 2 deletions
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97
src/modules/module-metadata/proxy-metadata.c Normal file
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/* 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 <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <spa/pod/parser.h>
#include "pipewire/pipewire.h"
#include "pipewire/private.h"
#include "extensions/metadata.h"
struct object_data {
struct pw_remote *remote;
struct pw_core *core;
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 object_proxy_destroy(void *_data)
{
struct object_data *data = _data;
spa_hook_remove(&data->object_listener);
}
static const struct pw_proxy_events proxy_events = {
PW_VERSION_PROXY_EVENTS,
.destroy = object_proxy_destroy,
};
struct pw_proxy *pw_remote_metadata_export(struct pw_remote *remote,
uint32_t type, struct pw_properties *props, void *object,
size_t user_data_size)
{
struct pw_metadata *meta = object;
struct spa_interface *iface;
struct pw_proxy *proxy;
struct object_data *data;
proxy = pw_core_proxy_create_object(remote->core_proxy,
"metadata",
PW_TYPE_INTERFACE_Metadata,
PW_VERSION_METADATA,
props ? &props->dict : NULL,
user_data_size + sizeof(struct object_data));
if (props)
pw_properties_free(props);
if (proxy == NULL)
return NULL;
data = pw_proxy_get_user_data(proxy);
data = SPA_MEMBER(data, user_data_size, struct object_data);
data->remote = remote;
data->object = object;
data->core = pw_remote_get_core(remote);
data->proxy = proxy;
iface = (struct spa_interface*)proxy;
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,
meta->iface.cb.funcs, meta->iface.cb.data);
pw_metadata_add_listener(meta, &data->object_listener,
iface->cb.funcs, iface->cb.data);
return proxy;
}