PipeWire 1.0.7
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Tutorial - Part 3: Forcing A Roundtrip


\ref page_tutorial3
/* [code] */
/* [roundtrip] */
struct roundtrip_data {
int pending;
struct pw_main_loop *loop;
static void on_core_done(void *data, uint32_t id, int seq)
struct roundtrip_data *d = data;
if (id == PW_ID_CORE && seq == d->pending)
static void roundtrip(struct pw_core *core, struct pw_main_loop *loop)
static const struct pw_core_events core_events = {
.done = on_core_done,
struct roundtrip_data d = { .loop = loop };
struct spa_hook core_listener;
pw_core_add_listener(core, &core_listener, &core_events, &d);
d.pending = pw_core_sync(core, PW_ID_CORE, 0);
/* [roundtrip] */
static void registry_event_global(void *data, uint32_t id,
uint32_t permissions, const char *type, uint32_t version,
const struct spa_dict *props)
printf("object: id:%u type:%s/%d\n", id, type, version);
static const struct pw_registry_events registry_events = {
.global = registry_event_global,
int main(int argc, char *argv[])
struct pw_main_loop *loop;
struct pw_context *context;
struct pw_core *core;
struct pw_registry *registry;
struct spa_hook registry_listener;
pw_init(&argc, &argv);
loop = pw_main_loop_new(NULL /* properties */);
NULL /* properties */,
0 /* user_data size */);
core = pw_context_connect(context,
NULL /* properties */,
0 /* user_data size */);
0 /* user_data size */);
pw_registry_add_listener(registry, &registry_listener,
&registry_events, NULL);
roundtrip(core, loop);
pw_proxy_destroy((struct pw_proxy*)registry);
return 0;
/* [code] */
void pw_context_destroy(struct pw_context *context)
destroy a context object, all resources except the main_loop will be destroyed
Definition context.c:393
struct pw_context * pw_context_new(struct pw_loop *main_loop, struct pw_properties *props, size_t user_data_size)
Make a new context object for a given main_loop.
Definition context.c:179
#define pw_core_sync(c,...)
Do server roundtrip.
Definition core.h:370
#define PW_ID_CORE
default ID for the core object after connect
Definition core.h:62
struct pw_core * pw_context_connect(struct pw_context *context, struct pw_properties *properties, size_t user_data_size)
Connect to a PipeWire instance.
Definition core.c:394
int pw_core_disconnect(struct pw_core *core)
disconnect and destroy a core
Definition core.c:481
Definition core.h:52
#define pw_core_add_listener(c,...)
Definition core.h:364
static struct pw_registry * pw_core_get_registry(struct pw_core *core, uint32_t version, size_t user_data_size)
Definition core.h:406
Definition core.h:128
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition main-loop.c:106
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition main-loop.c:71
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition main-loop.c:120
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition main-loop.c:61
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition main-loop.c:94
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:556
void pw_proxy_destroy(struct pw_proxy *proxy)
destroy a proxy
Definition proxy.c:206
Definition core.h:484
#define pw_registry_add_listener(p,...)
Definition core.h:568
static void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition hook.h:391
Core events.
Definition core.h:126
void(* done)(void *data, uint32_t id, int seq)
Emit a done event.
Definition core.h:148
A main loop object.
Registry events.
Definition core.h:482
void(* global)(void *data, uint32_t id, uint32_t permissions, const char *type, uint32_t version, const struct spa_dict *props)
Notify of a new global object.
Definition core.h:498
Definition dict.h:39
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350