link.h

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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef PIPEWIRE_LINK_H
#define PIPEWIRE_LINK_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/utils/defs.h>
#include <spa/utils/hook.h>
 
#include <pipewire/proxy.h>
 
#define PW_TYPE_INTERFACE_Link  PW_TYPE_INFO_INTERFACE_BASE "Link"
 
#define PW_LINK_PERM_MASK       PW_PERM_R | PW_PERM_X
 
#define PW_VERSION_LINK         3
struct pw_link;
 
enum pw_link_state {
        PW_LINK_STATE_ERROR = -2,       
        PW_LINK_STATE_UNLINKED = -1,    
        PW_LINK_STATE_INIT = 0,         
        PW_LINK_STATE_NEGOTIATING = 1,  
        PW_LINK_STATE_ALLOCATING = 2,   
        PW_LINK_STATE_PAUSED = 3,       
        PW_LINK_STATE_ACTIVE = 4,       
};
 
const char * pw_link_state_as_string(enum pw_link_state state);
struct pw_link_info {
        uint32_t id;                    
        uint32_t output_node_id;        
        uint32_t output_port_id;        
        uint32_t input_node_id;         
        uint32_t input_port_id;         
#define PW_LINK_CHANGE_MASK_STATE       (1 << 0)
#define PW_LINK_CHANGE_MASK_FORMAT      (1 << 1)
#define PW_LINK_CHANGE_MASK_PROPS       (1 << 2)
#define PW_LINK_CHANGE_MASK_ALL         ((1 << 3)-1)
        uint64_t change_mask;           
        enum pw_link_state state;       
        const char *error;              
        struct spa_pod *format;         
        struct spa_dict *props;         
};
 
struct pw_link_info *
pw_link_info_update(struct pw_link_info *info,
                const struct pw_link_info *update);
 
struct pw_link_info *
pw_link_info_merge(struct pw_link_info *info,
                const struct pw_link_info *update, bool reset);
 
void
pw_link_info_free(struct pw_link_info *info);
 
 
#define PW_LINK_EVENT_INFO      0
#define PW_LINK_EVENT_NUM       1
 
struct pw_link_events {
#define PW_VERSION_LINK_EVENTS  0
        uint32_t version;
        void (*info) (void *data, const struct pw_link_info *info);
};
 
#define PW_LINK_METHOD_ADD_LISTENER     0
#define PW_LINK_METHOD_NUM              1
 
struct pw_link_methods {
#define PW_VERSION_LINK_METHODS         0
        uint32_t version;
 
        int (*add_listener) (void *object,
                        struct spa_hook *listener,
                        const struct pw_link_events *events,
                        void *data);
};
 
#define pw_link_method(o,method,version,...)                            \
({                                                                      \
        int _res = -ENOTSUP;                                            \
        spa_interface_call_res((struct spa_interface*)o,                \
                        struct pw_link_methods, _res,                   \
                        method, version, ##__VA_ARGS__);                \
        _res;                                                           \
})
 
#define pw_link_add_listener(c,...)             pw_link_method(c,add_listener,0,__VA_ARGS__)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* PIPEWIRE_LINK_H */