1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
#include <dlfcn.h>
#include <spa/support/plugin.h>
#include <spa/utils/type.h>
#include <spa/utils/result.h>
#include <spa/support/cpu.h>
#include <spa/utils/names.h>
static inline const struct spa_handle_factory *get_factory(spa_handle_factory_enum_func_t enum_func,
const char *name, uint32_t version)
{
uint32_t i;
int res;
const struct spa_handle_factory *factory;
for (i = 0;;) {
if ((res = enum_func(&factory, &i)) <= 0) {
if (res < 0)
errno = -res;
break;
}
if (factory->version >= version &&
!strcmp(factory->name, name))
return factory;
}
return NULL;
}
static inline struct spa_handle *load_handle(const struct spa_support *support,
uint32_t n_support, const char *lib, const char *name)
{
int res, len;
void *hnd;
spa_handle_factory_enum_func_t enum_func;
const struct spa_handle_factory *factory;
struct spa_handle *handle;
const char *str;
char *path;
if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
str = ".";
len = strlen(str) + strlen(lib) + 2;
path = alloca(len);
snprintf(path, len, "%s/%s", str, lib);
if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
fprintf(stderr, "can't load %s: %s\n", lib, dlerror());
res = -ENOENT;
goto error;
}
if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
fprintf(stderr, "can't find enum function\n");
res = -ENXIO;
goto error_close;
}
if ((factory = get_factory(enum_func, name, SPA_VERSION_HANDLE_FACTORY)) == NULL) {
fprintf(stderr, "can't find factory\n");
res = -ENOENT;
goto error_close;
}
handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
if ((res = spa_handle_factory_init(factory, handle,
NULL, support, n_support)) < 0) {
fprintf(stderr, "can't make factory instance: %d\n", res);
goto error_close;
}
return handle;
error_close:
dlclose(hnd);
error:
errno = -res;
return NULL;
}
static inline uint32_t get_cpu_flags(void)
{
struct spa_handle *handle;
void *iface;
int res;
handle = load_handle(NULL, 0, "support/libspa-support.so", SPA_NAME_SUPPORT_CPU);
if (handle == NULL)
return 0;
if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_CPU, &iface)) < 0) {
fprintf(stderr, "can't get CPU interface %s\n", spa_strerror(res));
return 0;
}
return spa_cpu_get_flags((struct spa_cpu*)iface);
}
|
