PipeWire: spa/monitor/utils.h Source File

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utils.h
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1/* Simple Plugin API
2 *
3 * Copyright © 2019 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 SPA_DEVICE_UTILS_H
26#define SPA_DEVICE_UTILS_H
27
28#ifdef __cplusplus
29extern "C" {
30#endif
31
32#include <spa/pod/builder.h>
33#include <spa/monitor/device.h>
34
40struct spa_result_device_params_data {
41 struct spa_pod_builder *builder;
42 struct spa_result_device_params data;
43};
44
45 static inline void spa_result_func_device_params(void *data, int seq, int res,
46 uint32_t type, const void *result)
47{
48 struct spa_result_device_params_data *d =
49 (struct spa_result_device_params_data *)data;
50 const struct spa_result_device_params *r =
51 (const struct spa_result_device_params *)result;
52 uint32_t offset = d->builder->state.offset;
53 if (spa_pod_builder_raw_padded(d->builder, r->param, SPA_POD_SIZE(r->param)) < 0)
54 return;
55 d->data.next = r->next;
56 d->data.param = spa_pod_builder_deref(d->builder, offset);
57}
58
59static inline int spa_device_enum_params_sync(struct spa_device *device,
60 uint32_t id, uint32_t *index,
61 const struct spa_pod *filter,
62 struct spa_pod **param,
63 struct spa_pod_builder *builder)
64{
65 struct spa_result_device_params_data data = { builder, };
66 struct spa_hook listener = {{0}};
67 static const struct spa_device_events device_events = {
68 .version = SPA_VERSION_DEVICE_EVENTS,
69 .info = NULL,
70 .result = spa_result_func_device_params,
71 };
72 int res;
73
74 spa_device_add_listener(device, &listener, &device_events, &data);
75 res = spa_device_enum_params(device, 0, id, *index, 1, filter);
76 spa_hook_remove(&listener);
77
78 if (data.data.param == NULL) {
79 if (res > 0)
80 res = 0;
81 } else {
82 *index = data.data.next;
83 *param = data.data.param;
84 res = 1;
85 }
86 return res;
87}
88
89#define spa_device_emit(hooks,method,version,...) \
90 spa_hook_list_call_simple(hooks, struct spa_device_events, \
91 method, version, ##__VA_ARGS__)
92
93#define spa_device_emit_info(hooks,i) spa_device_emit(hooks,info, 0, i)
94#define spa_device_emit_result(hooks,s,r,t,res) spa_device_emit(hooks,result, 0, s, r, t, res)
95#define spa_device_emit_event(hooks,e) spa_device_emit(hooks,event, 0, e)
96#define spa_device_emit_object_info(hooks,id,i) spa_device_emit(hooks,object_info, 0, id, i)
97
102#ifdef __cplusplus
103} /* extern "C" */
104#endif
105
106#endif /* SPA_DEVICE_UTILS_H */
builder.h
spa/pod/builder.h
spa_device_enum_params
#define spa_device_enum_params(d,...)
Enumerate the parameters of a device.
Definition: device.h:288
spa_device_enum_params_sync
static 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:64
SPA_VERSION_DEVICE_EVENTS
#define SPA_VERSION_DEVICE_EVENTS
version of the structure
Definition: device.h:142
spa_device_add_listener
#define spa_device_add_listener(d,...)
Set events to receive asynchronous notifications from the device.
Definition: device.h:282
spa_result_func_device_params
static void spa_result_func_device_params(void *data, int seq, int res, uint32_t type, const void *result)
Definition: utils.h:50
spa_hook_remove
static void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition: hook.h:392
spa_pod_builder_raw_padded
static int spa_pod_builder_raw_padded(struct spa_pod_builder *builder, const void *data, uint32_t size)
Definition: builder.h:180
SPA_POD_SIZE
#define SPA_POD_SIZE(pod)
Definition: pod.h:50
spa_pod_builder_deref
static struct spa_pod * spa_pod_builder_deref(struct spa_pod_builder *builder, uint32_t offset)
Definition: builder.h:113
device.h
spa/monitor/device.h
spa_device_events
spa_device_events:
Definition: device.h:139
spa_device_events::version
uint32_t version
Definition: device.h:143
spa_device
Definition: device.h:60
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition: hook.h:351
spa_pod_builder_state::offset
uint32_t offset
Definition: builder.h:53
spa_pod_builder
Definition: builder.h:73
spa_pod_builder::state
struct spa_pod_builder_state state
Definition: builder.h:77
spa_pod
Definition: pod.h:63
spa_result_device_params_data
Definition: utils.h:45
spa_result_device_params_data::data
struct spa_result_device_params data
Definition: utils.h:47
spa_result_device_params_data::builder
struct spa_pod_builder * builder
Definition: utils.h:46
spa_result_device_params
Definition: device.h:116
spa_result_device_params::index
uint32_t index
Definition: device.h:118
spa_result_device_params::next
uint32_t next
Definition: device.h:119
spa_result_device_params::param
struct spa_pod * param
Definition: device.h:120