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/* Metadata API
*
* 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 <extensions/metadata.h>
#define pw_metadata_emit(hooks,method,version,...) \
spa_hook_list_call_simple(hooks, struct pw_metadata_events, \
method, version, ##__VA_ARGS__)
#define pw_metadata_emit_property(hooks,...) pw_metadata_emit(hooks,property, 0, ##__VA_ARGS__)
struct item {
uint32_t subject;
char *key;
char *type;
char *value;
};
static void clear_item(struct item *item)
{
free(item->key);
free(item->type);
free(item->value);
spa_zero(*item);
}
static void set_item(struct item *item, uint32_t subject, const char *key, const char *type, const char *value)
{
item->subject = subject;
item->key = strdup(key);
item->type = strdup(type);
item->value = strdup(value);
}
struct sm_metadata {
struct pw_metadata impl;
struct spa_hook_list hooks;
struct pw_properties *properties;
struct pw_array metadata;
};
static void emit_properties(struct sm_metadata *this, const struct spa_dict *dict)
{
struct item *item;
pw_array_for_each(item, &this->metadata) {
pw_metadata_emit_property(&this->hooks,
item->subject,
item->key,
item->type,
item->value);
}
}
static int impl_add_listener(void *object,
struct spa_hook *listener,
const struct pw_metadata_events *events,
void *data)
{
struct sm_metadata *this = object;
struct spa_hook_list save;
spa_return_val_if_fail(this != NULL, -EINVAL);
spa_return_val_if_fail(events != NULL, -EINVAL);
spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
emit_properties(this, &this->properties->dict);
spa_hook_list_join(&this->hooks, &save);
return 0;
}
static struct item *find_item(struct sm_metadata *this, uint32_t subject, const char *key)
{
struct item *item;
pw_array_for_each(item, &this->metadata) {
if (item->subject == subject && !strcmp(item->key, key))
return item;
}
return NULL;
}
static void clear_items(struct sm_metadata *this)
{
struct item *item;
pw_array_for_each(item, &this->metadata)
clear_item(item);
pw_array_reset(&this->metadata);
}
static int impl_set_property(void *object,
uint32_t subject,
const char *key,
const char *type,
const char *value)
{
struct sm_metadata *this = object;
struct item *item = NULL;
if (key == NULL)
return -EINVAL;
item = find_item(this, subject, key);
if (item == NULL) {
if (value == NULL)
return 0;
item = pw_array_add(&this->metadata, sizeof(*item));
if (item == NULL)
return -errno;
} else {
clear_item(item);
}
if (value != NULL) {
if (type == NULL)
type = "string";
set_item(item, subject, key, type, value);
pw_log_debug(NAME" %p: add id:%d key:%s type:%s value:%s", this,
subject, key, type, value);
} else {
type = NULL;
pw_array_remove(&this->metadata, item);
pw_log_debug(NAME" %p: remove id:%d key:%s", this, subject, key);
}
pw_metadata_emit_property(&this->hooks,
subject, key, type, value);
return 0;
}
static int impl_clear(void *object)
{
struct sm_metadata *this = object;
clear_items(this);
return 0;
}
struct pw_metadata_methods impl_metadata = {
PW_VERSION_METADATA_METHODS,
.add_listener = impl_add_listener,
.set_property = impl_set_property,
.clear = impl_clear,
};
struct sm_metadata *
sm_metadata_new(struct pw_properties *props)
{
struct sm_metadata *md;
if (props == NULL)
props = pw_properties_new(NULL, NULL);
if (props == NULL)
return NULL;
md = calloc(1, sizeof(*md));
md->properties = props;
pw_array_init(&md->metadata, 4096);
md->impl.iface = SPA_INTERFACE_INIT(
PW_TYPE_INTERFACE_Metadata,
PW_VERSION_METADATA,
&impl_metadata, md);
spa_hook_list_init(&md->hooks);
return md;
}
void sm_metadata_destroy(struct sm_metadata *this)
{
clear_items(this);
pw_array_clear(&this->metadata);
pw_properties_free(this->properties);
free(this);
}
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