plugin.h

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/* Simple Plugin API
 *
 * Copyright © 2018 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 SPA_PLUGIN_H
#define SPA_PLUGIN_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/utils/defs.h>
#include <spa/utils/dict.h>
 
struct spa_handle {
#define SPA_VERSION_HANDLE      0
        uint32_t version;
 
        int (*get_interface) (struct spa_handle *handle, const char *type, void **interface);
        int (*clear) (struct spa_handle *handle);
};
 
#define spa_handle_get_interface(h,...) (h)->get_interface((h),__VA_ARGS__)
#define spa_handle_clear(h)             (h)->clear((h))
 
struct spa_interface_info {
        const char *type;       /*< the type of the interface, can be
                                 *  used to get the interface */
};
 
struct spa_support {
        const char *type;       /*< the type of the support item */
        void *data;             /*< specific data for the item */
};
 
static inline void *spa_support_find(const struct spa_support *support,
                                     uint32_t n_support,
                                     const char *type)
{
        uint32_t i;
        for (i = 0; i < n_support; i++) {
                if (strcmp(support[i].type, type) == 0)
                        return support[i].data;
        }
        return NULL;
}
 
#define SPA_SUPPORT_INIT(type,data) ((struct spa_support) { (type), (data) })
 
struct spa_handle_factory {
#define SPA_VERSION_HANDLE_FACTORY      1
        uint32_t version;
        const char *name;
        const struct spa_dict *info;
        size_t (*get_size) (const struct spa_handle_factory *factory,
                            const struct spa_dict *params);
 
        int (*init) (const struct spa_handle_factory *factory,
                     struct spa_handle *handle,
                     const struct spa_dict *info,
                     const struct spa_support *support,
                     uint32_t n_support);
 
        int (*enum_interface_info) (const struct spa_handle_factory *factory,
                                    const struct spa_interface_info **info,
                                    uint32_t *index);
};
 
#define spa_handle_factory_get_size(h,...)              (h)->get_size((h),__VA_ARGS__)
#define spa_handle_factory_init(h,...)                  (h)->init((h),__VA_ARGS__)
#define spa_handle_factory_enum_interface_info(h,...)   (h)->enum_interface_info((h),__VA_ARGS__)
 
typedef int (*spa_handle_factory_enum_func_t) (const struct spa_handle_factory **factory,
                                               uint32_t *index);
 
#define SPA_HANDLE_FACTORY_ENUM_FUNC_NAME "spa_handle_factory_enum"
 
int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index);
 
 
 
#define SPA_KEY_FACTORY_NAME            "factory.name"          
#define SPA_KEY_FACTORY_AUTHOR          "factory.author"        
#define SPA_KEY_FACTORY_DESCRIPTION     "factory.description"   
#define SPA_KEY_FACTORY_USAGE           "factory.usage"         
#define SPA_KEY_LIBRARY_NAME            "library.name"          
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_PLUGIN_H */