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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
#ifndef PIPEWIRE_CORE_H
#define PIPEWIRE_CORE_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdarg.h>
#include <errno.h>
#include <spa/utils/hook.h>
/** \defgroup pw_core Core
*
* \brief The core global object.
*
* This is a special singleton object. It is used for internal PipeWire
* protocol features. Connecting to a PipeWire instance returns one core
* object, the caller should then register event listeners
* using \ref pw_core_add_listener.
*
* Updates to the core object are then provided through the \ref
* pw_core_events interface. See \ref page_tutorial2 for an example.
*/
/**
* \addtogroup pw_core
* \{
*/
#define PW_TYPE_INTERFACE_Core PW_TYPE_INFO_INTERFACE_BASE "Core"
#define PW_TYPE_INTERFACE_Registry PW_TYPE_INFO_INTERFACE_BASE "Registry"
#define PW_CORE_PERM_MASK PW_PERM_R|PW_PERM_X|PW_PERM_M
#define PW_VERSION_CORE 4
struct pw_core;
#define PW_VERSION_REGISTRY 3
struct pw_registry;
/** The default remote name to connect to */
#define PW_DEFAULT_REMOTE "pipewire-0"
/** default ID for the core object after connect */
#define PW_ID_CORE 0
/* invalid ID that matches any object when used for permissions */
#define PW_ID_ANY (uint32_t)(0xffffffff)
/** The core information. Extra information may be added in later versions,
* clients must not assume a constant struct size */
struct pw_core_info {
uint32_t id; /**< id of the global */
uint32_t cookie; /**< a random cookie for identifying this instance of PipeWire */
const char *user_name; /**< name of the user that started the core */
const char *host_name; /**< name of the machine the core is running on */
const char *version; /**< version of the core */
const char *name; /**< name of the core */
#define PW_CORE_CHANGE_MASK_PROPS (1 << 0)
#define PW_CORE_CHANGE_MASK_ALL ((1 << 1)-1)
uint64_t change_mask; /**< bitfield of changed fields since last call */
struct spa_dict *props; /**< extra properties */
};
#include <pipewire/context.h>
#include <pipewire/properties.h>
#include <pipewire/proxy.h>
/** Update an existing \ref pw_core_info with \a update with reset */
struct pw_core_info *
pw_core_info_update(struct pw_core_info *info,
const struct pw_core_info *update);
/** Update an existing \ref pw_core_info with \a update */
struct pw_core_info *
pw_core_info_merge(struct pw_core_info *info,
const struct pw_core_info *update, bool reset);
/** Free a \ref pw_core_info */
void pw_core_info_free(struct pw_core_info *info);
/** Core */
#define PW_CORE_EVENT_INFO 0
#define PW_CORE_EVENT_DONE 1
#define PW_CORE_EVENT_PING 2
#define PW_CORE_EVENT_ERROR 3
#define PW_CORE_EVENT_REMOVE_ID 4
#define PW_CORE_EVENT_BOUND_ID 5
#define PW_CORE_EVENT_ADD_MEM 6
#define PW_CORE_EVENT_REMOVE_MEM 7
#define PW_CORE_EVENT_BOUND_PROPS 8
#define PW_CORE_EVENT_NUM 9
/** \struct pw_core_events
* \brief Core events
*/
struct pw_core_events {
#define PW_VERSION_CORE_EVENTS 1
uint32_t version;
/**
* Notify new core info
*
* This event is emitted when first bound to the core or when the
* hello method is called.
*
* \param info new core info
*/
void (*info) (void *data, const struct pw_core_info *info);
/**
* Emit a done event
*
* The done event is emitted as a result of a sync method with the
* same seq number.
*
* \param seq the seq number passed to the sync method call
*/
void (*done) (void *data, uint32_t id, int seq);
/** Emit a ping event
*
* The client should reply with a pong reply with the same seq
* number.
*/
void (*ping) (void *data, uint32_t id, int seq);
/**
* Fatal error event
*
* The error event is sent out when a fatal (non-recoverable)
* error has occurred. The id argument is the proxy object where
* the error occurred, most often in response to a request to that
* object. The message is a brief description of the error,
* for (debugging) convenience.
*
* This event is usually also emitted on the proxy object with
* \a id.
*
* \param id object where the error occurred
* \param seq the sequence number that generated the error
* \param res error code
* \param message error description
*/
void (*error) (void *data, uint32_t id, int seq, int res, const char *message);
/**
* Remove an object ID
*
* This event is used internally by the object ID management
* logic. When a client deletes an object, the server will send
* this event to acknowledge that it has seen the delete request.
* When the client receives this event, it will know that it can
* safely reuse the object ID.
*
* \param id deleted object ID
*/
void (*remove_id) (void *data, uint32_t id);
/**
* Notify an object binding
*
* This event is emitted when a local object ID is bound to a
* global ID. It is emitted before the global becomes visible in the
* registry.
*
* \param id bound object ID
* \param global_id the global id bound to
*/
void (*bound_id) (void *data, uint32_t id, uint32_t global_id);
/**
* Add memory for a client
*
* Memory is given to a client as \a fd of a certain
* memory \a type.
*
* Further references to this fd will be made with the per memory
* unique identifier \a id.
*
* \param id the unique id of the memory
* \param type the memory type, one of enum spa_data_type
* \param fd the file descriptor
* \param flags extra flags
*/
void (*add_mem) (void *data, uint32_t id, uint32_t type, int fd, uint32_t flags);
/**
* Remove memory for a client
*
* \param id the memory id to remove
*/
void (*remove_mem) (void *data, uint32_t id);
void (*bound_props) (void *data, uint32_t id, uint32_t global_id, const struct spa_dict *props);
};
#define PW_CORE_METHOD_ADD_LISTENER 0
#define PW_CORE_METHOD_HELLO 1
#define PW_CORE_METHOD_SYNC 2
#define PW_CORE_METHOD_PONG 3
#define PW_CORE_METHOD_ERROR 4
#define PW_CORE_METHOD_GET_REGISTRY 5
#define PW_CORE_METHOD_CREATE_OBJECT 6
#define PW_CORE_METHOD_DESTROY 7
#define PW_CORE_METHOD_NUM 8
/**
* \struct pw_core_methods
* \brief Core methods
*
* The core global object. This is a singleton object used for
* creating new objects in the remote PipeWire instance. It is
* also used for internal features.
*/
struct pw_core_methods {
#define PW_VERSION_CORE_METHODS 0
uint32_t version;
int (*add_listener) (void *object,
struct spa_hook *listener,
const struct pw_core_events *events,
void *data);
/**
* Start a conversation with the server. This will send
* the core info and will destroy all resources for the client
* (except the core and client resource).
*
* This requires X permissions on the core.
*/
int (*hello) (void *object, uint32_t version);
/**
* Do server roundtrip
*
* Ask the server to emit the 'done' event with \a seq.
*
* Since methods are handled in-order and events are delivered
* in-order, this can be used as a barrier to ensure all previous
* methods and the resulting events have been handled.
*
* \param seq the seq number passed to the done event
*
* This requires X permissions on the core.
*/
int (*sync) (void *object, uint32_t id, int seq);
/**
* Reply to a server ping event.
*
* Reply to the server ping event with the same seq.
*
* \param seq the seq number received in the ping event
*
* This requires X permissions on the core.
*/
int (*pong) (void *object, uint32_t id, int seq);
/**
* Fatal error event
*
* The error method is sent out when a fatal (non-recoverable)
* error has occurred. The id argument is the proxy object where
* the error occurred, most often in response to an event on that
* object. The message is a brief description of the error,
* for (debugging) convenience.
*
* This method is usually also emitted on the resource object with
* \a id.
*
* \param id resource id where the error occurred
* \param res error code
* \param message error description
*
* This requires X permissions on the core.
*/
int (*error) (void *object, uint32_t id, int seq, int res, const char *message);
/**
* Get the registry object
*
* Create a registry object that allows the client to list and bind
* the global objects available from the PipeWire server
* \param version the client version
* \param user_data_size extra size
*
* This requires X permissions on the core.
*/
struct pw_registry * (*get_registry) (void *object, uint32_t version,
size_t user_data_size);
/**
* Create a new object on the PipeWire server from a factory.
*
* \param factory_name the factory name to use
* \param type the interface to bind to
* \param version the version of the interface
* \param props extra properties
* \param user_data_size extra size
*
* This requires X permissions on the core.
*/
void * (*create_object) (void *object,
const char *factory_name,
const char *type,
uint32_t version,
const struct spa_dict *props,
size_t user_data_size);
/**
* Destroy an resource
*
* Destroy the server resource for the given proxy.
*
* \param obj the proxy to destroy
*
* This requires X permissions on the core.
*/
int (*destroy) (void *object, void *proxy);
};
#define pw_core_method(o,method,version,...) \
({ \
int _res = -ENOTSUP; \
spa_interface_call_res((struct spa_interface*)o, \
struct pw_core_methods, _res, \
method, version, ##__VA_ARGS__); \
_res; \
})
#define pw_core_add_listener(c,...) pw_core_method(c,add_listener,0,__VA_ARGS__)
#define pw_core_hello(c,...) pw_core_method(c,hello,0,__VA_ARGS__)
#define pw_core_sync(c,...) pw_core_method(c,sync,0,__VA_ARGS__)
#define pw_core_pong(c,...) pw_core_method(c,pong,0,__VA_ARGS__)
#define pw_core_error(c,...) pw_core_method(c,error,0,__VA_ARGS__)
static inline
SPA_PRINTF_FUNC(5, 0) int
pw_core_errorv(struct pw_core *core, uint32_t id, int seq,
int res, const char *message, va_list args)
{
char buffer[1024];
vsnprintf(buffer, sizeof(buffer), message, args);
buffer[1023] = '\0';
return pw_core_error(core, id, seq, res, buffer);
}
static inline
SPA_PRINTF_FUNC(5, 6) int
pw_core_errorf(struct pw_core *core, uint32_t id, int seq,
int res, const char *message, ...)
{
va_list args;
int r;
va_start(args, message);
r = pw_core_errorv(core, id, seq, res, message, args);
va_end(args);
return r;
}
static inline struct pw_registry *
pw_core_get_registry(struct pw_core *core, uint32_t version, size_t user_data_size)
{
struct pw_registry *res = NULL;
spa_interface_call_res((struct spa_interface*)core,
struct pw_core_methods, res,
get_registry, 0, version, user_data_size);
return res;
}
static inline void *
pw_core_create_object(struct pw_core *core,
const char *factory_name,
const char *type,
uint32_t version,
const struct spa_dict *props,
size_t user_data_size)
{
void *res = NULL;
spa_interface_call_res((struct spa_interface*)core,
struct pw_core_methods, res,
create_object, 0, factory_name,
type, version, props, user_data_size);
return res;
}
#define pw_core_destroy(c,...) pw_core_method(c,destroy,0,__VA_ARGS__)
/**
* \}
*/
/** \defgroup pw_registry Registry
*
* The registry object is a singleton object that keeps track of
* global objects on the PipeWire instance. See also \ref pw_global.
*
* Global objects typically represent an actual object in PipeWire
* (for example, a module or node) or they are singleton
* objects such as the core.
*
* When a client creates a registry object, the registry object
* will emit a global event for each global currently in the
* registry. Globals come and go as a result of device hotplugs or
* reconfiguration or other events, and the registry will send out
* global and global_remove events to keep the client up to date
* with the changes. To mark the end of the initial burst of
* events, the client can use the pw_core.sync methosd immediately
* after calling pw_core.get_registry.
*
* A client can bind to a global object by using the bind
* request. This creates a client-side proxy that lets the object
* emit events to the client and lets the client invoke methods on
* the object. See \ref page_proxy
*
* Clients can also change the permissions of the global objects that
* it can see. This is interesting when you want to configure a
* pipewire session before handing it to another application. You
* can, for example, hide certain existing or new objects or limit
* the access permissions on an object.
*/
/**
* \addtogroup pw_registry
* \{
*/
#define PW_REGISTRY_EVENT_GLOBAL 0
#define PW_REGISTRY_EVENT_GLOBAL_REMOVE 1
#define PW_REGISTRY_EVENT_NUM 2
/** Registry events */
struct pw_registry_events {
#define PW_VERSION_REGISTRY_EVENTS 0
uint32_t version;
/**
* Notify of a new global object
*
* The registry emits this event when a new global object is
* available.
*
* \param id the global object id
* \param permissions the permissions of the object
* \param type the type of the interface
* \param version the version of the interface
* \param props extra properties of the 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 global object removal
*
* Emitted when a global object was removed from the registry.
* If the client has any bindings to the global, it should destroy
* those.
*
* \param id the id of the global that was removed
*/
void (*global_remove) (void *data, uint32_t id);
};
#define PW_REGISTRY_METHOD_ADD_LISTENER 0
#define PW_REGISTRY_METHOD_BIND 1
#define PW_REGISTRY_METHOD_DESTROY 2
#define PW_REGISTRY_METHOD_NUM 3
/** Registry methods */
struct pw_registry_methods {
#define PW_VERSION_REGISTRY_METHODS 0
uint32_t version;
int (*add_listener) (void *object,
struct spa_hook *listener,
const struct pw_registry_events *events,
void *data);
/**
* Bind to a global object
*
* Bind to the global object with \a id and use the client proxy
* with new_id as the proxy. After this call, methods can be
* send to the remote global object and events can be received
*
* \param id the global id to bind to
* \param type the interface type to bind to
* \param version the interface version to use
* \returns the new object
*/
void * (*bind) (void *object, uint32_t id, const char *type, uint32_t version,
size_t use_data_size);
/**
* Attempt to destroy a global object
*
* Try to destroy the global object.
*
* \param id the global id to destroy. The client needs X permissions
* on the global.
*/
int (*destroy) (void *object, uint32_t id);
};
#define pw_registry_method(o,method,version,...) \
({ \
int _res = -ENOTSUP; \
spa_interface_call_res((struct spa_interface*)o, \
struct pw_registry_methods, _res, \
method, version, ##__VA_ARGS__); \
_res; \
})
/** Registry */
#define pw_registry_add_listener(p,...) pw_registry_method(p,add_listener,0,__VA_ARGS__)
static inline void *
pw_registry_bind(struct pw_registry *registry,
uint32_t id, const char *type, uint32_t version,
size_t user_data_size)
{
void *res = NULL;
spa_interface_call_res((struct spa_interface*)registry,
struct pw_registry_methods, res,
bind, 0, id, type, version, user_data_size);
return res;
}
#define pw_registry_destroy(p,...) pw_registry_method(p,destroy,0,__VA_ARGS__)
/**
* \}
*/
/**
* \addtogroup pw_core
* \{
*/
/** Connect to a PipeWire instance
*
* \param context a \ref pw_context
* \param properties optional properties, ownership of the properties is
* taken.
* \param user_data_size extra user data size
*
* \return a \ref pw_core on success or NULL with errno set on error. The core
* will have an id of \ref PW_ID_CORE (0)
*/
struct pw_core *
pw_context_connect(struct pw_context *context,
struct pw_properties *properties,
size_t user_data_size);
/** Connect to a PipeWire instance on the given socket
*
* \param context a \ref pw_context
* \param fd the connected socket to use, the socket will be closed
* automatically on disconnect or error.
* \param properties optional properties, ownership of the properties is
* taken.
* \param user_data_size extra user data size
*
* \return a \ref pw_core on success or NULL with errno set on error */
struct pw_core *
pw_context_connect_fd(struct pw_context *context,
int fd,
struct pw_properties *properties,
size_t user_data_size);
/** Connect to a given PipeWire instance
*
* \param context a \ref pw_context to connect to
* \param properties optional properties, ownership of the properties is
* taken.
* \param user_data_size extra user data size
*
* \return a \ref pw_core on success or NULL with errno set on error */
struct pw_core *
pw_context_connect_self(struct pw_context *context,
struct pw_properties *properties,
size_t user_data_size);
/** Steal the fd of the core connection or < 0 on error. The core
* will be disconnected after this call. */
int pw_core_steal_fd(struct pw_core *core);
/** Pause or resume the core. When the core is paused, no new events
* will be dispatched until the core is resumed again. */
int pw_core_set_paused(struct pw_core *core, bool paused);
/** disconnect and destroy a core */
int pw_core_disconnect(struct pw_core *core);
/** Get the user_data. It is of the size specified when this object was
* constructed */
void *pw_core_get_user_data(struct pw_core *core);
/** Get the client proxy of the connected core. This will have the id
* of PW_ID_CLIENT (1) */
struct pw_client * pw_core_get_client(struct pw_core *core);
/** Get the context object used to created this core */
struct pw_context * pw_core_get_context(struct pw_core *core);
/** Get properties from the core */
const struct pw_properties *pw_core_get_properties(struct pw_core *core);
/** Update the core properties. This updates the properties
* of the associated client.
* \return the number of properties that were updated */
int pw_core_update_properties(struct pw_core *core, const struct spa_dict *dict);
/** Get the core mempool object */
struct pw_mempool * pw_core_get_mempool(struct pw_core *core);
/** Get the proxy with the given id */
struct pw_proxy *pw_core_find_proxy(struct pw_core *core, uint32_t id);
/** Export an object into the PipeWire instance associated with core */
struct pw_proxy *pw_core_export(struct pw_core *core, /**< the core */
const char *type, /**< the type of object */
const struct spa_dict *props, /**< extra properties */
void *object, /**< object to export */
size_t user_data_size /**< extra user data */);
/**
* \}
*/
#ifdef __cplusplus
}
#endif
#endif /* PIPEWIRE_CORE_H */