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tutorial3.c

Tutorial - Part 3: Forcing A Roundtrip

/*
[title]
\ref page_tutorial3
[title]
*/
/* [code] */
#include <pipewire/pipewire.h>
/* [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)
pw_main_loop_quit(d->loop);
}
static void roundtrip(struct pw_core *core, struct pw_main_loop *loop)
{
static const struct pw_core_events core_events = {
PW_VERSION_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);
pw_main_loop_run(loop);
spa_hook_remove(&core_listener);
}
/* [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 = {
PW_VERSION_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 */);
context = pw_context_new(pw_main_loop_get_loop(loop),
NULL /* properties */,
0 /* user_data size */);
core = pw_context_connect(context,
NULL /* properties */,
0 /* user_data size */);
registry = pw_core_get_registry(core, PW_VERSION_REGISTRY,
0 /* user_data size */);
pw_registry_add_listener(registry, &registry_listener,
&registry_events, NULL);
roundtrip(core, loop);
pw_proxy_destroy((struct pw_proxy*)registry);
pw_core_disconnect(core);
pw_context_destroy(context);
pw_main_loop_destroy(loop);
return 0;
}
/* [code] */
pw_context_destroy
void pw_context_destroy(struct pw_context *context)
destroy a context object, all resources except the main_loop will be destroyed
Definition context.c:387
pw_context_new
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:175
pw_core_sync
#define pw_core_sync(c,...)
Do server roundtrip.
Definition core.h:370
PW_ID_CORE
#define PW_ID_CORE
default ID for the core object after connect
Definition core.h:62
pw_context_connect
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:391
pw_core_disconnect
int pw_core_disconnect(struct pw_core *core)
disconnect and destroy a core
Definition core.c:478
PW_VERSION_REGISTRY
#define PW_VERSION_REGISTRY
Definition core.h:52
pw_core_add_listener
#define pw_core_add_listener(c,...)
Definition core.h:364
pw_core_get_registry
static struct pw_registry * pw_core_get_registry(struct pw_core *core, uint32_t version, size_t user_data_size)
Definition core.h:406
PW_VERSION_CORE_EVENTS
#define PW_VERSION_CORE_EVENTS
Definition core.h:128
pw_main_loop_quit
int pw_main_loop_quit(struct pw_main_loop *loop)
Quit a main loop.
Definition main-loop.c:106
pw_main_loop_destroy
void pw_main_loop_destroy(struct pw_main_loop *loop)
Destroy a loop.
Definition main-loop.c:71
pw_main_loop_run
int pw_main_loop_run(struct pw_main_loop *loop)
Run a main loop.
Definition main-loop.c:120
pw_main_loop_new
struct pw_main_loop * pw_main_loop_new(const struct spa_dict *props)
Create a new main loop.
Definition main-loop.c:61
pw_main_loop_get_loop
struct pw_loop * pw_main_loop_get_loop(struct pw_main_loop *loop)
Get the loop implementation.
Definition main-loop.c:94
pw_init
void pw_init(int *argc, char **argv[])
Initialize PipeWire.
Definition pipewire.c:556
pw_proxy_destroy
void pw_proxy_destroy(struct pw_proxy *proxy)
destroy a proxy
Definition proxy.c:206
PW_VERSION_REGISTRY_EVENTS
#define PW_VERSION_REGISTRY_EVENTS
Definition core.h:484
pw_registry_add_listener
#define pw_registry_add_listener(p,...)
Registry.
Definition core.h:568
spa_hook_remove
static void spa_hook_remove(struct spa_hook *hook)
Remove a hook.
Definition hook.h:391
pipewire.h
pipewire/pipewire.h
pw_context
pw_core_events
Core events.
Definition core.h:126
pw_core_events::done
void(* done)(void *data, uint32_t id, int seq)
Emit a done event.
Definition core.h:148
pw_core
pw_main_loop
A main loop object.
pw_proxy
pw_registry_events
Registry events.
Definition core.h:482
pw_registry_events::global
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
pw_registry
spa_dict
Definition dict.h:39
spa_hook
A hook, contains the structure with functions and the data passed to the functions.
Definition hook.h:350