PipeWire  1.4.3
utils.h
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1 /* Simple Plugin API */
2 /* SPDX-FileCopyrightText: Copyright © 2019 Wim Taymans */
3 /* SPDX-License-Identifier: MIT */
4 
5 #ifndef SPA_DEVICE_UTILS_H
6 #define SPA_DEVICE_UTILS_H
7 
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11 
12 #include <spa/pod/builder.h>
13 #include <spa/monitor/device.h>
14 
15 #ifndef SPA_API_DEVICE_UTILS
16  #ifdef SPA_API_IMPL
17  #define SPA_API_DEVICE_UTILS SPA_API_IMPL
18  #else
19  #define SPA_API_DEVICE_UTILS static inline
20  #endif
21 #endif
22 
29  struct spa_pod_builder *builder;
31 };
32 
34  uint32_t type SPA_UNUSED, const void *result)
35 {
38  const struct spa_result_device_params *r =
39  (const struct spa_result_device_params *)result;
40  uint32_t offset = d->builder->state.offset;
41  if (spa_pod_builder_raw_padded(d->builder, r->param, SPA_POD_SIZE(r->param)) < 0)
42  return;
43  d->data.next = r->next;
44  d->data.param = spa_pod_builder_deref(d->builder, offset);
45 }
46 
48  uint32_t id, uint32_t *index,
49  const struct spa_pod *filter,
50  struct spa_pod **param,
51  struct spa_pod_builder *builder)
52 {
54  struct spa_hook listener = {{0}, {0}, 0, 0};
55  static const struct spa_device_events device_events = {
57  .info = NULL,
59  };
60  int res;
61 
62  spa_device_add_listener(device, &listener, &device_events, &data);
63  res = spa_device_enum_params(device, 0, id, *index, 1, filter);
64  spa_hook_remove(&listener);
65 
66  if (data.data.param == NULL) {
67  if (res > 0)
68  res = 0;
69  } else {
70  *index = data.data.next;
71  *param = data.data.param;
72  res = 1;
73  }
74  return res;
75 }
76 
77 #define spa_device_emit(hooks,method,version,...) \
78  spa_hook_list_call_simple(hooks, struct spa_device_events, \
79  method, version, ##__VA_ARGS__)
80 
81 #define spa_device_emit_info(hooks,i) spa_device_emit(hooks,info, 0, i)
82 #define spa_device_emit_result(hooks,s,r,t,res) spa_device_emit(hooks,result, 0, s, r, t, res)
83 #define spa_device_emit_event(hooks,e) spa_device_emit(hooks,event, 0, e)
84 #define spa_device_emit_object_info(hooks,id,i) spa_device_emit(hooks,object_info, 0, id, i)
85 
90 #ifdef __cplusplus
91 } /* extern "C" */
92 #endif
93 
94 #endif /* SPA_DEVICE_UTILS_H */
spa/pod/builder.h
uint32_t int seq
Definition: core.h:432
uint32_t int int const char int r
Definition: core.h:445
uint32_t int int res
Definition: core.h:433
SPA_API_DEVICE int spa_device_enum_params(struct spa_device *object, int seq, uint32_t id, uint32_t index, uint32_t max, const struct spa_pod *filter)
Definition: device.h:276
#define SPA_VERSION_DEVICE_EVENTS
version of the structure
Definition: device.h:132
SPA_API_DEVICE int spa_device_add_listener(struct spa_device *object, struct spa_hook *listener, const struct spa_device_events *events, void *data)
Definition: device.h:262
SPA_API_DEVICE_UTILS void spa_result_func_device_params(void *data, int seq, int res 1, uint32_t type, const void *result)
Definition: utils.h:40
SPA_API_DEVICE_UTILS int spa_device_enum_params_sync(struct spa_device *device, uint32_t id, uint32_t *index, const struct spa_pod *filter, struct spa_pod **param, struct spa_pod_builder *builder)
Definition: utils.h:54
SPA_API_HOOK void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition: hook.h:468
SPA_API_POD_BUILDER struct spa_pod * spa_pod_builder_deref(struct spa_pod_builder *builder, uint32_t offset)
Definition: builder.h:103
SPA_API_POD_BUILDER int spa_pod_builder_raw_padded(struct spa_pod_builder *builder, const void *data, uint32_t size)
Definition: builder.h:179
#define SPA_POD_SIZE(pod)
Definition: pod.h:30
#define SPA_UNUSED
Definition: defs.h:307
spa/monitor/device.h
#define SPA_API_DEVICE_UTILS
Definition: utils.h:26
spa_device_events:
Definition: device.h:129
uint32_t version
Definition: device.h:133
Definition: device.h:50
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:427
uint32_t offset
Definition: builder.h:43
Definition: builder.h:63
struct spa_pod_builder_state state
Definition: builder.h:67
Definition: pod.h:43
Definition: utils.h:35
struct spa_result_device_params data
Definition: utils.h:37
struct spa_pod_builder * builder
Definition: utils.h:36
Definition: device.h:106
uint32_t index
Definition: device.h:108
uint32_t next
Definition: device.h:109
struct spa_pod * param
Definition: device.h:110