PipeWire  0.3.61
node.h
Go to the documentation of this file.
1 /* PipeWire
2  *
3  * Copyright © 2018 Wim Taymans
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
10  * Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22  * DEALINGS IN THE SOFTWARE.
23  */
24 
25 #ifndef PIPEWIRE_NODE_H
26 #define PIPEWIRE_NODE_H
27 
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31 
32 #include <stdarg.h>
33 #include <errno.h>
34 
35 #include <spa/utils/defs.h>
36 #include <spa/utils/hook.h>
37 #include <spa/node/command.h>
38 #include <spa/param/param.h>
39 
40 #include <pipewire/proxy.h>
41 
50 #define PW_TYPE_INTERFACE_Node PW_TYPE_INFO_INTERFACE_BASE "Node"
51 
52 #define PW_VERSION_NODE 3
53 struct pw_node;
54 
56 enum pw_node_state {
57  PW_NODE_STATE_ERROR = -1,
61  PW_NODE_STATE_IDLE = 2,
64 };
65 
67 const char * pw_node_state_as_string(enum pw_node_state state);
68 
70 struct pw_node_info {
71  uint32_t id;
72  uint32_t max_input_ports;
73  uint32_t max_output_ports;
74 #define PW_NODE_CHANGE_MASK_INPUT_PORTS (1 << 0)
75 #define PW_NODE_CHANGE_MASK_OUTPUT_PORTS (1 << 1)
76 #define PW_NODE_CHANGE_MASK_STATE (1 << 2)
77 #define PW_NODE_CHANGE_MASK_PROPS (1 << 3)
78 #define PW_NODE_CHANGE_MASK_PARAMS (1 << 4)
79 #define PW_NODE_CHANGE_MASK_ALL ((1 << 5)-1)
80  uint64_t change_mask;
81  uint32_t n_input_ports;
82  uint32_t n_output_ports;
83  enum pw_node_state state;
84  const char *error;
85  struct spa_dict *props;
87  uint32_t n_params;
88 };
89 
90 struct pw_node_info *
92  const struct pw_node_info *update);
93 
94 struct pw_node_info *
96  const struct pw_node_info *update, bool reset);
97 
98 void
100 
101 #define PW_NODE_EVENT_INFO 0
102 #define PW_NODE_EVENT_PARAM 1
103 #define PW_NODE_EVENT_NUM 2
104 
106 struct pw_node_events {
107 #define PW_VERSION_NODE_EVENTS 0
108  uint32_t version;
114  void (*info) (void *data, const struct pw_node_info *info);
126  void (*param) (void *data, int seq,
127  uint32_t id, uint32_t index, uint32_t next,
128  const struct spa_pod *param);
129 };
130 
131 #define PW_NODE_METHOD_ADD_LISTENER 0
132 #define PW_NODE_METHOD_SUBSCRIBE_PARAMS 1
133 #define PW_NODE_METHOD_ENUM_PARAMS 2
134 #define PW_NODE_METHOD_SET_PARAM 3
135 #define PW_NODE_METHOD_SEND_COMMAND 4
136 #define PW_NODE_METHOD_NUM 5
137 
139 struct pw_node_methods {
140 #define PW_VERSION_NODE_METHODS 0
141  uint32_t version;
142 
143  int (*add_listener) (void *object,
144  struct spa_hook *listener,
145  const struct pw_node_events *events,
146  void *data);
156  int (*subscribe_params) (void *object, uint32_t *ids, uint32_t n_ids);
157 
170  int (*enum_params) (void *object, int seq, uint32_t id,
171  uint32_t start, uint32_t num,
172  const struct spa_pod *filter);
173 
181  int (*set_param) (void *object, uint32_t id, uint32_t flags,
182  const struct spa_pod *param);
183 
189  int (*send_command) (void *object, const struct spa_command *command);
190 };
191 
192 #define pw_node_method(o,method,version,...) \
193 ({ \
194  int _res = -ENOTSUP; \
195  spa_interface_call_res((struct spa_interface*)o, \
196  struct pw_node_methods, _res, \
197  method, version, ##__VA_ARGS__); \
198  _res; \
199 })
200 
202 #define pw_node_add_listener(c,...) pw_node_method(c,add_listener,0,__VA_ARGS__)
203 #define pw_node_subscribe_params(c,...) pw_node_method(c,subscribe_params,0,__VA_ARGS__)
204 #define pw_node_enum_params(c,...) pw_node_method(c,enum_params,0,__VA_ARGS__)
205 #define pw_node_set_param(c,...) pw_node_method(c,set_param,0,__VA_ARGS__)
206 #define pw_node_send_command(c,...) pw_node_method(c,send_command,0,__VA_ARGS__)
207 
212 #ifdef __cplusplus
213 } /* extern "C" */
214 #endif
215 
216 #endif /* PIPEWIRE_NODE_H */
spa/utils/defs.h
void pw_node_info_free(struct pw_node_info *info)
Definition: introspect.c:251
struct pw_node_info * pw_node_info_merge(struct pw_node_info *info, const struct pw_node_info *update, bool reset)
Definition: introspect.c:177
struct pw_node_info * pw_node_info_update(struct pw_node_info *info, const struct pw_node_info *update)
Definition: introspect.c:244
pw_node_state
The different node states.
Definition: node.h:63
const char * pw_node_state_as_string(enum pw_node_state state)
Convert a pw_node_state to a readable string.
Definition: introspect.c:34
@ PW_NODE_STATE_ERROR
error state
Definition: node.h:64
@ PW_NODE_STATE_SUSPENDED
the node is suspended, the device might be closed
Definition: node.h:66
@ PW_NODE_STATE_IDLE
the node is running but there is no active port
Definition: node.h:68
@ PW_NODE_STATE_CREATING
the node is being created
Definition: node.h:65
@ PW_NODE_STATE_RUNNING
the node is running
Definition: node.h:70
spa/utils/hook.h
spa/node/command.h
spa/param/param.h
pipewire/proxy.h
Node events.
Definition: node.h:122
void(* info)(void *data, const struct pw_node_info *info)
Notify node info.
Definition: node.h:131
uint32_t version
Definition: node.h:125
void(* param)(void *data, int seq, uint32_t id, uint32_t index, uint32_t next, const struct spa_pod *param)
Notify a node param.
Definition: node.h:143
The node information.
Definition: node.h:77
enum pw_node_state state
the current state of the node
Definition: node.h:96
uint32_t max_input_ports
maximum number of inputs
Definition: node.h:79
const char * error
an error reason if state is error
Definition: node.h:97
uint32_t id
id of the global
Definition: node.h:78
uint64_t change_mask
bitfield of changed fields since last call
Definition: node.h:93
struct spa_param_info * params
parameters
Definition: node.h:99
uint32_t n_output_ports
number of outputs
Definition: node.h:95
uint32_t max_output_ports
maximum number of outputs
Definition: node.h:80
uint32_t n_params
number of items in params
Definition: node.h:100
uint32_t n_input_ports
number of inputs
Definition: node.h:94
Node methods.
Definition: node.h:162
int(* add_listener)(void *object, struct spa_hook *listener, const struct pw_node_events *events, void *data)
Definition: node.h:167
int(* set_param)(void *object, uint32_t id, uint32_t flags, const struct spa_pod *param)
Set a parameter on the node.
Definition: node.h:205
int(* enum_params)(void *object, int seq, uint32_t id, uint32_t start, uint32_t num, const struct spa_pod *filter)
Enumerate node parameters.
Definition: node.h:194
uint32_t version
Definition: node.h:165
int(* subscribe_params)(void *object, uint32_t *ids, uint32_t n_ids)
Subscribe to parameter changes.
Definition: node.h:180
int(* send_command)(void *object, const struct spa_command *command)
Send a command to the node.
Definition: node.h:213
Definition: impl.h:45
Definition: command.h:49
Definition: dict.h:59
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:351
information about a parameter
Definition: param.h:70
Definition: pod.h:63