metadata.h

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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.
 */
 
#ifndef PIPEWIRE_EXT_METADATA_H
#define PIPEWIRE_EXT_METADATA_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/utils/defs.h>
 
#define PW_TYPE_INTERFACE_Metadata              PW_TYPE_INFO_INTERFACE_BASE "Metadata"
 
#define PW_VERSION_METADATA                     3
struct pw_metadata;
 
#define PW_EXTENSION_MODULE_METADATA            PIPEWIRE_MODULE_PREFIX "module-metadata"
 
#define PW_METADATA_EVENT_PROPERTY              0
#define PW_METADATA_EVENT_NUM                   1
 
struct pw_metadata_events {
#define PW_VERSION_METADATA_EVENTS              0
        uint32_t version;
 
        int (*property) (void *object,
                        uint32_t subject,
                        const char *key,
                        const char *type,
                        const char *value);
};
 
#define PW_METADATA_METHOD_ADD_LISTENER         0
#define PW_METADATA_METHOD_SET_PROPERTY         1
#define PW_METADATA_METHOD_CLEAR                2
#define PW_METADATA_METHOD_NUM                  3
 
struct pw_metadata_methods {
#define PW_VERSION_METADATA_METHODS             0
        uint32_t version;
 
        int (*add_listener) (void *object,
                        struct spa_hook *listener,
                        const struct pw_metadata_events *events,
                        void *data);
 
        int (*set_property) (void *object,
                        uint32_t subject,
                        const char *key,
                        const char *type,
                        const char *value);
 
        int (*clear) (void *object);
};
 
 
#define pw_metadata_method(o,method,version,...)                        \
({                                                                      \
        int _res = -ENOTSUP;                                            \
        spa_interface_call_res((struct spa_interface*)o,                \
                        struct pw_metadata_methods, _res,               \
                        method, version, ##__VA_ARGS__);                \
        _res;                                                           \
})
 
#define pw_metadata_add_listener(c,...)         pw_metadata_method(c,add_listener,0,__VA_ARGS__)
#define pw_metadata_set_property(c,...)         pw_metadata_method(c,set_property,0,__VA_ARGS__)
#define pw_metadata_clear(c)                    pw_metadata_method(c,clear,0)
 
#define PW_KEY_METADATA_NAME            "metadata.name"
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* PIPEWIRE_EXT_METADATA_H */