port.h

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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef PIPEWIRE_PORT_H
#define PIPEWIRE_PORT_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdarg.h>
#include <errno.h>
 
#include <spa/utils/defs.h>
#include <spa/utils/hook.h>
#include <spa/param/param.h>
 
#include <pipewire/proxy.h>
 
#define PW_TYPE_INTERFACE_Port  PW_TYPE_INFO_INTERFACE_BASE "Port"
 
#define PW_VERSION_PORT         3
struct pw_port;
 
#define pw_direction spa_direction
#define PW_DIRECTION_INPUT SPA_DIRECTION_INPUT
#define PW_DIRECTION_OUTPUT SPA_DIRECTION_OUTPUT
 
const char * pw_direction_as_string(enum pw_direction direction);
 
struct pw_port_info {
        uint32_t id;                            
        enum pw_direction direction;            
#define PW_PORT_CHANGE_MASK_PROPS               (1 << 0)
#define PW_PORT_CHANGE_MASK_PARAMS              (1 << 1)
#define PW_PORT_CHANGE_MASK_ALL                 ((1 << 2)-1)
        uint64_t change_mask;                   
        struct spa_dict *props;                 
        struct spa_param_info *params;          
        uint32_t n_params;                      
};
 
struct pw_port_info *
pw_port_info_update(struct pw_port_info *info,
                const struct pw_port_info *update);
 
struct pw_port_info *
pw_port_info_merge(struct pw_port_info *info,
                const struct pw_port_info *update, bool reset);
 
void
pw_port_info_free(struct pw_port_info *info);
 
#define PW_PORT_EVENT_INFO      0
#define PW_PORT_EVENT_PARAM     1
#define PW_PORT_EVENT_NUM       2
 
struct pw_port_events {
#define PW_VERSION_PORT_EVENTS  0
        uint32_t version;
        void (*info) (void *data, const struct pw_port_info *info);
        void (*param) (void *data, int seq,
                       uint32_t id, uint32_t index, uint32_t next,
                       const struct spa_pod *param);
};
 
#define PW_PORT_METHOD_ADD_LISTENER     0
#define PW_PORT_METHOD_SUBSCRIBE_PARAMS 1
#define PW_PORT_METHOD_ENUM_PARAMS      2
#define PW_PORT_METHOD_NUM              3
 
struct pw_port_methods {
#define PW_VERSION_PORT_METHODS         0
        uint32_t version;
 
        int (*add_listener) (void *object,
                        struct spa_hook *listener,
                        const struct pw_port_events *events,
                        void *data);
        int (*subscribe_params) (void *object, uint32_t *ids, uint32_t n_ids);
 
        int (*enum_params) (void *object, int seq,
                        uint32_t id, uint32_t start, uint32_t num,
                        const struct spa_pod *filter);
};
 
#define pw_port_method(o,method,version,...)                            \
({                                                                      \
        int _res = -ENOTSUP;                                            \
        spa_interface_call_res((struct spa_interface*)o,                \
                        struct pw_port_methods, _res,                   \
                        method, version, ##__VA_ARGS__);                \
        _res;                                                           \
})
 
#define pw_port_add_listener(c,...)     pw_port_method(c,add_listener,0,__VA_ARGS__)
#define pw_port_subscribe_params(c,...) pw_port_method(c,subscribe_params,0,__VA_ARGS__)
#define pw_port_enum_params(c,...)      pw_port_method(c,enum_params,0,__VA_ARGS__)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* PIPEWIRE_PORT_H */