filter.h

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/* PipeWire
 *
 * Copyright © 2019 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 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 <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;                
        uint64_t size;                  
};
#endif
 
struct pw_filter_events {
#define PW_VERSION_FILTER_EVENTS        0
        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);
};
 
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),     
};
 
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),     
};
 
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               );
 
 
#if 0
struct pw_time {
        int64_t now;                    
        struct spa_fraction rate;       
        uint64_t ticks;                 
};
#endif
 
int pw_filter_get_time(struct pw_filter *filter, struct pw_time *time);
 
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);
 
#ifdef __cplusplus
}
#endif
 
#endif /* PIPEWIRE_FILTER_H */