PipeWire 1.0.7
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tag-utils.h
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1/* Simple Plugin API */
2/* SPDX-FileCopyrightText: Copyright © 2023 Wim Taymans */
3/* SPDX-License-Identifier: MIT */
4
5#ifndef SPA_PARAM_TAG_UTILS_H
6#define SPA_PARAM_TAG_UTILS_H
7
8#ifdef __cplusplus
9extern "C" {
10#endif
11
17#include <float.h>
18
19#include <spa/utils/dict.h>
20#include <spa/pod/builder.h>
21#include <spa/pod/parser.h>
22#include <spa/param/tag.h>
23
24static inline int
25spa_tag_compare(const struct spa_pod *a, const struct spa_pod *b)
26{
27 return ((a == b) || (a && b && SPA_POD_SIZE(a) == SPA_POD_SIZE(b) &&
28 memcmp(a, b, SPA_POD_SIZE(b)) == 0)) ? 0 : 1;
29}
31static inline int
32spa_tag_parse(const struct spa_pod *tag, struct spa_tag_info *info, void **state)
33{
34 int res;
35 const struct spa_pod_object *obj = (const struct spa_pod_object*)tag;
36 const struct spa_pod_prop *first, *start, *cur;
38 spa_zero(*info);
39
40 if ((res = spa_pod_parse_object(tag,
43 return res;
44
45 first = spa_pod_prop_first(&obj->body);
46 start = *state ? spa_pod_prop_next((struct spa_pod_prop*)*state) : first;
47
48 res = 0;
49 for (cur = start; spa_pod_prop_is_inside(&obj->body, obj->pod.size, cur);
50 cur = spa_pod_prop_next(cur)) {
51 if (cur->key == SPA_PARAM_TAG_info) {
52 info->info = &cur->value;
53 *state = (void*)cur;
54 return 1;
55 }
56 }
57 return 0;
58}
59
60static inline int
61spa_tag_info_parse(const struct spa_tag_info *info, struct spa_dict *dict, struct spa_dict_item *items)
62{
63 struct spa_pod_parser prs;
64 uint32_t n, n_items;
65 const char *key, *value;
66 struct spa_pod_frame f[1];
67
68 spa_pod_parser_pod(&prs, info->info);
69 if (spa_pod_parser_push_struct(&prs, &f[0]) < 0 ||
70 spa_pod_parser_get_int(&prs, (int32_t*)&n_items) < 0)
71 return -EINVAL;
72
73 if (items == NULL) {
74 dict->n_items = n_items;
75 return 0;
76 }
77 n_items = SPA_MIN(dict->n_items, n_items);
78
79 for (n = 0; n < n_items; n++) {
80 if (spa_pod_parser_get(&prs,
81 SPA_POD_String(&key),
82 SPA_POD_String(&value),
83 NULL) < 0)
84 break;
85 items[n].key = key;
86 items[n].value = value;
87 }
88 dict->items = items;
89 spa_pod_parser_pop(&prs, &f[0]);
90 return 0;
91}
92
93static inline void
94spa_tag_build_start(struct spa_pod_builder *builder, struct spa_pod_frame *f,
95 uint32_t id, enum spa_direction direction)
96{
98 spa_pod_builder_add(builder,
100 0);
101}
102
103static inline void
104spa_tag_build_add_info(struct spa_pod_builder *builder, const struct spa_pod *info)
105{
106 spa_pod_builder_add(builder,
108 0);
110
111static inline void
112spa_tag_build_add_dict(struct spa_pod_builder *builder, const struct spa_dict *dict)
113{
114 uint32_t i, n_items;
115 struct spa_pod_frame f;
116
117 n_items = dict ? dict->n_items : 0;
118
120 spa_pod_builder_push_struct(builder, &f);
121 spa_pod_builder_int(builder, n_items);
122 for (i = 0; i < n_items; i++) {
123 spa_pod_builder_string(builder, dict->items[i].key);
124 spa_pod_builder_string(builder, dict->items[i].value);
125 }
126 spa_pod_builder_pop(builder, &f);
127}
128
129static inline struct spa_pod *
130spa_tag_build_end(struct spa_pod_builder *builder, struct spa_pod_frame *f)
131{
132 return (struct spa_pod*)spa_pod_builder_pop(builder, f);
133}
134
139#ifdef __cplusplus
140} /* extern "C" */
141#endif
142
143#endif /* SPA_PARAM_TAG_UTILS_H */
spa/pod/builder.h
static void spa_tag_build_add_info(struct spa_pod_builder *builder, const struct spa_pod *info)
Definition tag-utils.h:109
static void spa_tag_build_add_dict(struct spa_pod_builder *builder, const struct spa_dict *dict)
Definition tag-utils.h:117
static int spa_tag_compare(const struct spa_pod *a, const struct spa_pod *b)
Definition tag-utils.h:30
static int spa_tag_parse(const struct spa_pod *tag, struct spa_tag_info *info, void **state)
Definition tag-utils.h:37
static int spa_tag_info_parse(const struct spa_tag_info *info, struct spa_dict *dict, struct spa_dict_item *items)
Definition tag-utils.h:66
static void spa_tag_build_start(struct spa_pod_builder *builder, struct spa_pod_frame *f, uint32_t id, enum spa_direction direction)
Definition tag-utils.h:99
static struct spa_pod * spa_tag_build_end(struct spa_pod_builder *builder, struct spa_pod_frame *f)
Definition tag-utils.h:135
@ SPA_PARAM_TAG_direction
direction, input/output (Id enum spa_direction)
Definition tag.h:27
@ SPA_PARAM_TAG_info
Struct( Int: n_items (String: key ...
Definition tag.h:28
static int spa_pod_builder_prop(struct spa_pod_builder *builder, uint32_t key, uint32_t flags)
Definition builder.h:450
static void spa_pod_parser_pod(struct spa_pod_parser *parser, const struct spa_pod *pod)
Definition parser.h:50
#define SPA_POD_String(val)
Definition vararg.h:94
static int spa_pod_builder_string(struct spa_pod_builder *builder, const char *str)
Definition builder.h:305
static int spa_pod_parser_get(struct spa_pod_parser *parser,...)
Definition parser.h:505
static int spa_pod_builder_add(struct spa_pod_builder *builder,...)
Definition builder.h:647
#define SPA_POD_Id(val)
Definition vararg.h:49
static int spa_pod_parser_get_int(struct spa_pod_parser *parser, int32_t *value)
Definition parser.h:148
static void * spa_pod_builder_pop(struct spa_pod_builder *builder, struct spa_pod_frame *frame)
Definition builder.h:168
static int spa_pod_parser_push_struct(struct spa_pod_parser *parser, struct spa_pod_frame *frame)
Definition parser.h:247
static int spa_pod_builder_push_struct(struct spa_pod_builder *builder, struct spa_pod_frame *frame)
Definition builder.h:422
static struct spa_pod_prop * spa_pod_prop_next(const struct spa_pod_prop *iter)
Definition iter.h:57
static int spa_pod_builder_int(struct spa_pod_builder *builder, int32_t val)
Definition builder.h:247
static int spa_pod_builder_push_object(struct spa_pod_builder *builder, struct spa_pod_frame *frame, uint32_t type, uint32_t id)
Definition builder.h:435
#define SPA_POD_PROP_FLAG_HINT_DICT
contains a dictionary struct as (Struct( Int : n_items,...
Definition pod.h:216
static struct spa_pod_prop * spa_pod_prop_first(const struct spa_pod_object_body *body)
Definition iter.h:45
#define spa_pod_parse_object(pod, type, id,...)
Definition parser.h:576
#define SPA_POD_Pod(val)
Definition vararg.h:128
#define SPA_POD_SIZE(pod)
Definition pod.h:30
static int spa_pod_parser_pop(struct spa_pod_parser *parser, struct spa_pod_frame *frame)
Definition parser.h:122
static bool spa_pod_prop_is_inside(const struct spa_pod_object_body *body, uint32_t size, const struct spa_pod_prop *iter)
Definition iter.h:50
@ SPA_TYPE_OBJECT_ParamTag
Definition type.h:86
#define SPA_MIN(a, b)
Definition defs.h:151
#define spa_zero(x)
Definition defs.h:431
spa_direction
Definition defs.h:92
spa/pod/parser.h
Definition dict.h:31
const char * key
Definition dict.h:32
const char * value
Definition dict.h:33
Definition dict.h:39
const struct spa_dict_item * items
Definition dict.h:44
uint32_t n_items
Definition dict.h:43
Definition builder.h:53
Definition iter.h:27
Definition pod.h:183
struct spa_pod pod
Definition pod.h:184
struct spa_pod_object_body body
Definition pod.h:185
Definition parser.h:34
Definition pod.h:208
uint32_t key
key of property, list of valid keys depends on the object type
Definition pod.h:209
struct spa_pod value
Definition pod.h:226
Definition pod.h:43
uint32_t size
Definition pod.h:44
helper structure for managing tag objects
Definition tag.h:36
enum spa_direction direction
Definition tag.h:37
const struct spa_pod * info
Definition tag.h:38
spa/param/tag.h
spa/utils/dict.h