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Node Impl
Implementation API

The node object processes data. More...

## Files

file | impl-node.h
| `pipewire/impl-node.h`

## Data Structures

struct | pw_impl_node_events
| Node events, listen to them with pw_impl_node_add_listener. More...
struct | pw_impl_node_rt_events
struct | pw_impl_node
struct | pw_impl_port

## Macros

#define | PW_VERSION_IMPL_NODE_EVENTS 0
#define | PW_VERSION_IMPL_NODE_RT_EVENTS 0

## Functions

struct pw_impl_node * | pw_context_create_node (struct pw_context *context, struct pw_properties *properties, size_t user_data_size)
| Create a new node.
int | pw_impl_node_register (struct pw_impl_node *node, struct pw_properties *properties)
| Complete initialization of the node and register.
void | pw_impl_node_destroy (struct pw_impl_node *node)
| Destroy a node.
const struct pw_node_info * | pw_impl_node_get_info (struct pw_impl_node *node)
| Get the node info.
void * | pw_impl_node_get_user_data (struct pw_impl_node *node)
| Get node user_data.
struct pw_context * | pw_impl_node_get_context (struct pw_impl_node *node)
| Get the context of this node.
struct pw_global * | pw_impl_node_get_global (struct pw_impl_node *node)
| Get the global of this node.
const struct pw_properties * | pw_impl_node_get_properties (struct pw_impl_node *node)
| Get the node properties.
int | pw_impl_node_update_properties (struct pw_impl_node *node, const struct spa_dict *dict)
| Update the node properties.
int | pw_impl_node_set_implementation (struct pw_impl_node *node, struct spa_node *spa_node)
| Set the node implementation.
struct spa_node * | pw_impl_node_get_implementation (struct pw_impl_node *node)
| Get the node implementation.
void | pw_impl_node_add_listener (struct pw_impl_node *node, struct spa_hook *listener, const struct pw_impl_node_events *events, void *data)
| Add an event listener.
void | pw_impl_node_add_rt_listener (struct pw_impl_node *node, struct spa_hook *listener, const struct pw_impl_node_rt_events *events, void *data)
| Add an rt_event listener.
void | pw_impl_node_remove_rt_listener (struct pw_impl_node *node, struct spa_hook *listener)
int | pw_impl_node_for_each_port (struct pw_impl_node *node, enum pw_direction direction, int(*callback)(void *data, struct pw_impl_port *port), void *data)
| Iterate the ports in the given direction.
int | pw_impl_node_for_each_param (struct pw_impl_node *node, int seq, uint32_t param_id, uint32_t index, uint32_t max, const struct spa_pod *filter, int(*callback)(void *data, int seq, uint32_t id, uint32_t index, uint32_t next, struct spa_pod *param), void *data)
struct pw_impl_port * | pw_impl_node_find_port (struct pw_impl_node *node, enum pw_direction direction, uint32_t port_id)
| Find the port with direction and port_id or NULL when not found.
uint32_t | pw_impl_node_get_free_port_id (struct pw_impl_node *node, enum pw_direction direction)
| Get a free unused port_id from the node.
int | pw_impl_node_initialized (struct pw_impl_node *node)
int | pw_impl_node_set_active (struct pw_impl_node *node, bool active)
| Set a node active.
bool | pw_impl_node_is_active (struct pw_impl_node *node)
| Check if a node is active.
int | pw_impl_node_send_command (struct pw_impl_node *node, const struct spa_command *command)
| Check if a node is active, Since 0.3.39.
int | pw_impl_node_set_param (struct pw_impl_node *node, uint32_t id, uint32_t flags, const struct spa_pod *param)
| Set a param on the node, Since 0.3.65.

## Detailed Description

The node object processes data.

The node has a list of input and output ports (Port Impl) on which it will receive and send out buffers respectively.

## Macro Definition Documentation

## PW_VERSION_IMPL_NODE_EVENTS

#define PW_VERSION_IMPL_NODE_EVENTS 0

## PW_VERSION_IMPL_NODE_RT_EVENTS

#define PW_VERSION_IMPL_NODE_RT_EVENTS 0

## Function Documentation

## pw_context_create_node()

struct pw_impl_node * pw_context_create_node | ( | struct pw_context * | context,
|  | struct pw_properties * | properties,
|  | size_t | user_data_size
| ) |  |

Create a new node.

Parameters

  context | the context
  properties | extra properties
  user_data_size | user data size

## pw_impl_node_register()

int pw_impl_node_register | ( | struct pw_impl_node * | node,
|  | struct pw_properties * | properties
| ) |  |

Complete initialization of the node and register.

Parameters

  node | node to register
  properties | extra properties

## pw_impl_node_destroy()

void pw_impl_node_destroy | ( | struct pw_impl_node * | node | ) |

Destroy a node.

Parameters

  node | a node to destroy

Remove node. This will stop the transfer on the node and free the resources allocated by node.

## pw_impl_node_get_info()

const struct pw_node_info * pw_impl_node_get_info | ( | struct pw_impl_node * | node | ) |

Get the node info.

## pw_impl_node_get_user_data()

void * pw_impl_node_get_user_data | ( | struct pw_impl_node * | node | ) |

Get node user_data.

The size of the memory was given in pw_context_create_node

## pw_impl_node_get_context()

struct pw_context * pw_impl_node_get_context | ( | struct pw_impl_node * | node | ) |

Get the context of this node.

## pw_impl_node_get_global()

struct pw_global * pw_impl_node_get_global | ( | struct pw_impl_node * | node | ) |

Get the global of this node.

## pw_impl_node_get_properties()

const struct pw_properties * pw_impl_node_get_properties | ( | struct pw_impl_node * | node | ) |

Get the node properties.

## pw_impl_node_update_properties()

int pw_impl_node_update_properties | ( | struct pw_impl_node * | node,
|  | const struct spa_dict * | dict
| ) |  |

Update the node properties.

## pw_impl_node_set_implementation()

int pw_impl_node_set_implementation | ( | struct pw_impl_node * | node,
|  | struct spa_node * | spa_node
| ) |  |

Set the node implementation.

## pw_impl_node_get_implementation()

struct spa_node * pw_impl_node_get_implementation | ( | struct pw_impl_node * | node | ) |

Get the node implementation.

## pw_impl_node_add_listener()

void pw_impl_node_add_listener | ( | struct pw_impl_node * | node,
|  | struct spa_hook * | listener,
|  | const struct pw_impl_node_events * | events,
|  | void * | data
| ) |  |

Add an event listener.

## pw_impl_node_add_rt_listener()

void pw_impl_node_add_rt_listener | ( | struct pw_impl_node * | node,
|  | struct spa_hook * | listener,
|  | const struct pw_impl_node_rt_events * | events,
|  | void * | data
| ) |  |

Add an rt_event listener.

## pw_impl_node_remove_rt_listener()

void pw_impl_node_remove_rt_listener | ( | struct pw_impl_node * | node,
|  | struct spa_hook * | listener
| ) |  |

## pw_impl_node_for_each_port()

int pw_impl_node_for_each_port | ( | struct pw_impl_node * | node,
|  | enum pw_direction | direction,
|  | int(*)(void *data, struct pw_impl_port *port) | callback,
|  | void * | data
| ) |  |

Iterate the ports in the given direction.

The callback should return 0 to fetch the next item, any other value stops the iteration and returns the value. When all callbacks return 0, this function returns 0 when all items are iterated.

## pw_impl_node_for_each_param()

int pw_impl_node_for_each_param | ( | struct pw_impl_node * | node,
|  | int | seq,
|  | uint32_t | param_id,
|  | uint32_t | index,
|  | uint32_t | max,
|  | const struct spa_pod * | filter,
|  | int(*)(void *data, int seq, uint32_t id, uint32_t index, uint32_t next, struct spa_pod *param) | callback,
|  | void * | data
| ) |  |

## pw_impl_node_find_port()

struct pw_impl_port * pw_impl_node_find_port | ( | struct pw_impl_node * | node,
|  | enum pw_direction | direction,
|  | uint32_t | port_id
| ) |  |

Find the port with direction and port_id or NULL when not found.

Passing PW_ID_ANY for port_id will return any port, preferably an unlinked one.

## pw_impl_node_get_free_port_id()

uint32_t pw_impl_node_get_free_port_id | ( | struct pw_impl_node * | node,
|  | enum pw_direction | direction
| ) |  |

Get a free unused port_id from the node.

## pw_impl_node_initialized()

int pw_impl_node_initialized | ( | struct pw_impl_node * | node | ) |

## pw_impl_node_set_active()

int pw_impl_node_set_active | ( | struct pw_impl_node * | node,
|  | bool | active
| ) |  |

Set a node active.

This will start negotiation with all linked active nodes and start data transport

## pw_impl_node_is_active()

bool pw_impl_node_is_active | ( | struct pw_impl_node * | node | ) |

Check if a node is active.

## pw_impl_node_send_command()

int pw_impl_node_send_command | ( | struct pw_impl_node * | node,
|  | const struct spa_command * | command
| ) |  |

Check if a node is active, Since 0.3.39.

## pw_impl_node_set_param()

int pw_impl_node_set_param | ( | struct pw_impl_node * | node,
|  | uint32_t | id,
|  | uint32_t | flags,
|  | const struct spa_pod * | param
| ) |  |

Set a param on the node, Since 0.3.65.