filter.h

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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef PIPEWIRE_FILTER_H
#define PIPEWIRE_FILTER_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct pw_filter;
 
#include <spa/buffer/buffer.h>
#include <spa/node/io.h>
#include <spa/param/param.h>
#include <spa/pod/command.h>
#include <spa/pod/event.h>
 
#include <pipewire/core.h>
#include <pipewire/stream.h>
 
enum pw_filter_state {
        PW_FILTER_STATE_ERROR = -1,             
        PW_FILTER_STATE_UNCONNECTED = 0,        
        PW_FILTER_STATE_CONNECTING = 1,         
        PW_FILTER_STATE_PAUSED = 2,             
        PW_FILTER_STATE_STREAMING = 3           
};
 
#if 0
struct pw_buffer {
        struct spa_buffer *buffer;      
        void *user_data;                
        PW_FILTER_STATE_STREAMING = 3            {…};
        uint64_t size;                  
};
#endif
 
struct pw_filter_events {
#define PW_VERSION_FILTER_EVENTS        1
        uint32_t version;
 
        void (*destroy) (void *data);
        void (*state_changed) (void *data, enum pw_filter_state old,
                                enum pw_filter_state state, const char *error);
 
        void (*io_changed) (void *data, void *port_data,
                        uint32_t id, void *area, uint32_t size);
        void (*param_changed) (void *data, void *port_data,
                        uint32_t id, const struct spa_pod *param);
 
        void (*add_buffer) (void *data, void *port_data, struct pw_buffer *buffer);
        void (*remove_buffer) (void *data, void *port_data, struct pw_buffer *buffer);
 
        void (*process) (void *data, struct spa_io_position *position);
 
        void (*drained) (void *data);
 
        void (*command) (void *data, const struct spa_command *command);
};
 
const char * pw_filter_state_as_string(enum pw_filter_state state);
 
enum pw_filter_flags {
        PW_FILTER_FLAG_NONE = 0,                        
        PW_FILTER_FLAG_INACTIVE         = (1 << 0),     
        PW_FILTER_FLAG_DRIVER           = (1 << 1),     
        PW_FILTER_FLAG_RT_PROCESS       = (1 << 2),     
        PW_FILTER_FLAG_CUSTOM_LATENCY   = (1 << 3),     
        PW_FILTER_FLAG_TRIGGER          = (1 << 4),     
        PW_FILTER_FLAG_ASYNC            = (1 << 5),     
};
 
enum pw_filter_port_flags {
        PW_FILTER_PORT_FLAG_NONE                = 0,            
        PW_FILTER_PORT_FLAG_MAP_BUFFERS         = (1 << 0),     
        PW_FILTER_PORT_FLAG_ALLOC_BUFFERS       = (1 << 1),     
        PW_FILTER_FLAG_RT_PROCESS       = (1 << 2),      {…};
};
 
struct pw_filter *
pw_filter_new(struct pw_core *core,             
              const char *name,                 
              struct pw_properties *props       );
 
struct pw_filter *
pw_filter_new_simple(struct pw_loop *loop,              
                     const char *name,                  
                     struct pw_properties *props,       
                     const struct pw_filter_events *events,     
                     void *data                                 );
 
void pw_filter_destroy(struct pw_filter *filter);
 
void pw_filter_add_listener(struct pw_filter *filter,
                            struct spa_hook *listener,
                            const struct pw_filter_events *events,
                            void *data);
 
enum pw_filter_state pw_filter_get_state(struct pw_filter *filter, const char **error);
 
const char *pw_filter_get_name(struct pw_filter *filter);
 
struct pw_core *pw_filter_get_core(struct pw_filter *filter);
 
int
pw_filter_connect(struct pw_filter *filter,             
                  enum pw_filter_flags flags,           
                  const struct spa_pod **params,        
                  uint32_t n_params                     );
 
uint32_t
pw_filter_get_node_id(struct pw_filter *filter);
 
int pw_filter_disconnect(struct pw_filter *filter);
 
void *pw_filter_add_port(struct pw_filter *filter,      
                enum pw_direction direction,            
                enum pw_filter_port_flags flags,        
                size_t port_data_size,                  
                struct pw_properties *props,            
                const struct spa_pod **params,          
                uint32_t n_params                       );
 
int pw_filter_remove_port(void *port_data               );
 
const struct pw_properties *pw_filter_get_properties(struct pw_filter *filter,
                void *port_data);
 
int pw_filter_update_properties(struct pw_filter *filter,
                void *port_data, const struct spa_dict *dict);
 
int pw_filter_set_error(struct pw_filter *filter,       
                        int res,                        
                        const char *error,              
                        ...
                        ) SPA_PRINTF_FUNC(3, 4);
 
int
pw_filter_update_params(struct pw_filter *filter,       
                        void *port_data,                
                        const struct spa_pod **params,  
                        uint32_t n_params               );
 
 
SPA_DEPRECATED
int pw_filter_get_time(struct pw_filter *filter, struct pw_time *time);
 
uint64_t pw_filter_get_nsec(struct pw_filter *filter);
 
struct pw_loop *pw_filter_get_data_loop(struct pw_filter *filter);
 
struct pw_buffer *pw_filter_dequeue_buffer(void *port_data);
 
int pw_filter_queue_buffer(void *port_data, struct pw_buffer *buffer);
 
void *pw_filter_get_dsp_buffer(void *port_data, uint32_t n_samples);
 
int pw_filter_set_active(struct pw_filter *filter, bool active);
 
int pw_filter_flush(struct pw_filter *filter, bool drain);
 
bool pw_filter_is_driving(struct pw_filter *filter);
 
bool pw_filter_is_lazy(struct pw_filter *filter);
 
int pw_filter_trigger_process(struct pw_filter *filter);
 
int pw_filter_emit_event(struct pw_filter *filter, const struct spa_event *event);
 
#ifdef __cplusplus
}
#endif
 
#endif /* PIPEWIRE_FILTER_H */