node.h

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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef PIPEWIRE_NODE_H
#define PIPEWIRE_NODE_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdarg.h>
#include <errno.h>
 
#include <spa/utils/defs.h>
#include <spa/utils/hook.h>
#include <spa/node/command.h>
#include <spa/param/param.h>
 
#include <pipewire/proxy.h>
 
#define PW_TYPE_INTERFACE_Node  PW_TYPE_INFO_INTERFACE_BASE "Node"
 
#define PW_NODE_PERM_MASK       PW_PERM_RWXML
 
#define PW_VERSION_NODE         3
struct pw_node;
 
enum pw_node_state {
        PW_NODE_STATE_ERROR = -1,       
        PW_NODE_STATE_CREATING = 0,     
        PW_NODE_STATE_SUSPENDED = 1,    
        PW_NODE_STATE_IDLE = 2,         
        PW_NODE_STATE_RUNNING = 3,      
};
 
const char * pw_node_state_as_string(enum pw_node_state state);
 
struct pw_node_info {
        uint32_t id;                            
        uint32_t max_input_ports;               
        uint32_t max_output_ports;              
#define PW_NODE_CHANGE_MASK_INPUT_PORTS         (1 << 0)
#define PW_NODE_CHANGE_MASK_OUTPUT_PORTS        (1 << 1)
#define PW_NODE_CHANGE_MASK_STATE               (1 << 2)
#define PW_NODE_CHANGE_MASK_PROPS               (1 << 3)
#define PW_NODE_CHANGE_MASK_PARAMS              (1 << 4)
#define PW_NODE_CHANGE_MASK_ALL                 ((1 << 5)-1)
        uint64_t change_mask;                   
        uint32_t n_input_ports;                 
        uint32_t n_output_ports;                
        enum pw_node_state state;               
        const char *error;                      
        struct spa_dict *props;                 
        struct spa_param_info *params;          
        uint32_t n_params;                      
};
 
struct pw_node_info *
pw_node_info_update(struct pw_node_info *info,
                const struct pw_node_info *update);
 
struct pw_node_info *
pw_node_info_merge(struct pw_node_info *info,
                const struct pw_node_info *update, bool reset);
 
void
pw_node_info_free(struct pw_node_info *info);
 
#define PW_NODE_EVENT_INFO      0
#define PW_NODE_EVENT_PARAM     1
#define PW_NODE_EVENT_NUM       2
 
struct pw_node_events {
#define PW_VERSION_NODE_EVENTS  0
        uint32_t version;
        void (*info) (void *data, const struct pw_node_info *info);
        void (*param) (void *data, int seq,
                      uint32_t id, uint32_t index, uint32_t next,
                      const struct spa_pod *param);
};
 
#define PW_NODE_METHOD_ADD_LISTENER     0
#define PW_NODE_METHOD_SUBSCRIBE_PARAMS 1
#define PW_NODE_METHOD_ENUM_PARAMS      2
#define PW_NODE_METHOD_SET_PARAM        3
#define PW_NODE_METHOD_SEND_COMMAND     4
#define PW_NODE_METHOD_NUM              5
 
struct pw_node_methods {
#define PW_VERSION_NODE_METHODS         0
        uint32_t version;
 
        int (*add_listener) (void *object,
                        struct spa_hook *listener,
                        const struct pw_node_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);
 
        int (*set_param) (void *object, uint32_t id, uint32_t flags,
                        const struct spa_pod *param);
 
        int (*send_command) (void *object, const struct spa_command *command);
};
 
#define pw_node_method(o,method,version,...)                            \
({                                                                      \
        int _res = -ENOTSUP;                                            \
        spa_interface_call_res((struct spa_interface*)o,                \
                        struct pw_node_methods, _res,                   \
                        method, version, ##__VA_ARGS__);                \
        _res;                                                           \
})
 
#define pw_node_add_listener(c,...)     pw_node_method(c,add_listener,0,__VA_ARGS__)
#define pw_node_subscribe_params(c,...) pw_node_method(c,subscribe_params,0,__VA_ARGS__)
#define pw_node_enum_params(c,...)      pw_node_method(c,enum_params,0,__VA_ARGS__)
#define pw_node_set_param(c,...)        pw_node_method(c,set_param,0,__VA_ARGS__)
#define pw_node_send_command(c,...)     pw_node_method(c,send_command,0,__VA_ARGS__)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* PIPEWIRE_NODE_H */