mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-03 09:01:54 -05:00
97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
#include <dlfcn.h>
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#include <spa/support/plugin.h>
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#include <spa/utils/type.h>
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#include <spa/utils/result.h>
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#include <spa/support/cpu.h>
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#include <spa/utils/names.h>
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static inline const struct spa_handle_factory *get_factory(spa_handle_factory_enum_func_t enum_func,
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const char *name, uint32_t version)
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{
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uint32_t i;
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int res;
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const struct spa_handle_factory *factory;
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for (i = 0;;) {
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if ((res = enum_func(&factory, &i)) <= 0) {
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if (res < 0)
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errno = -res;
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break;
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}
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if (factory->version >= version &&
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!strcmp(factory->name, name))
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return factory;
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}
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return NULL;
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}
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static inline struct spa_handle *load_handle(const struct spa_support *support,
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uint32_t n_support, const char *lib, const char *name)
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{
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int res, len;
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void *hnd;
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spa_handle_factory_enum_func_t enum_func;
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const struct spa_handle_factory *factory;
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struct spa_handle *handle;
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const char *str;
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char *path;
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if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
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str = PLUGINDIR;
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len = strlen(str) + strlen(lib) + 2;
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path = alloca(len);
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snprintf(path, len, "%s/%s", str, lib);
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if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
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fprintf(stderr, "can't load %s: %s\n", lib, dlerror());
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res = -ENOENT;
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goto error;
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}
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if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
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fprintf(stderr, "can't find enum function\n");
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res = -ENXIO;
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goto error_close;
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}
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if ((factory = get_factory(enum_func, name, SPA_VERSION_HANDLE_FACTORY)) == NULL) {
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fprintf(stderr, "can't find factory\n");
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res = -ENOENT;
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goto error_close;
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}
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handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
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if ((res = spa_handle_factory_init(factory, handle,
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NULL, support, n_support)) < 0) {
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fprintf(stderr, "can't make factory instance: %d\n", res);
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goto error_close;
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}
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return handle;
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error_close:
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dlclose(hnd);
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error:
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errno = -res;
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return NULL;
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}
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static inline uint32_t get_cpu_flags(void)
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{
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struct spa_handle *handle;
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uint32_t flags;
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void *iface;
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int res;
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handle = load_handle(NULL, 0, "support/libspa-support.so", SPA_NAME_SUPPORT_CPU);
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if (handle == NULL)
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return 0;
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if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_CPU, &iface)) < 0) {
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fprintf(stderr, "can't get CPU interface %s\n", spa_strerror(res));
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return 0;
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}
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flags = spa_cpu_get_flags((struct spa_cpu*)iface);
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free(handle);
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return flags;
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}
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